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JP2010263512

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DESCRIPTION JP2010263512
The present invention aims to cover a wider frequency band and to use acoustic diaphragms of
various materials and thicknesses, even in a so-called vibration type speaker device using an
actuator. A vibration transmission member 2 is provided so as to be in contact with an acoustic
diaphragm 1 by a predetermined length, and a vibration corresponding to a sound to be
reproduced is applied to the vibration transmission member 2 by an actuator 3. Thereby, the
vibration is efficiently transmitted to the acoustic diaphragm 1 through the vibration
transmission member 2, and the transmission efficiency (propagation efficiency) of the vibration
is improved and emitted as compared with the case where the acoustic diaphragm 1 is directly
vibrated. Make it possible to cover a wider frequency band for voice. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to, for example, a speaker device having an excitation type
configuration in which vibration corresponding to an audio signal generated by an actuator such
as a giant magnetostrictive actuator is transmitted to an acoustic diaphragm to generate sound.
[0002]
As a speaker device, not a usual speaker unit having a voice coil and a cone but an actuator such
as a super magnetostrictive actuator that vibrates an acoustic diaphragm made of acrylic or the
like to generate sound is considered and put to practical use .
[0003]
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1
Specifically, in Patent Document 1, a cylindrical acoustic diaphragm is vertically supported, and a
plurality of magnetostrictive actuators are disposed on the lower end side of the acoustic
diaphragm, and drive rods of the respective magnetostrictive actuators are disposed under the
acoustic diaphragm. A device is shown which abuts the end face and applies an axial vibration to
the acoustic diaphragm.
[0004]
In this speaker device, first, by vibrating the end face of the cylindrical diaphragm, compression
waves propagate instantaneously in the longitudinal direction of the cylinder.
In the process of propagation of the compressional waves, a force is generated in the radial
direction of the cylinder (direction orthogonal to the longitudinal direction of the cylinder) by the
Poisson's ratio of the solid.
This force causes radial vibration, resulting in the generation of sound waves from the entire
cylindrical diaphragm.
[0005]
Here, the Poisson's ratio is the ratio of the expansion or contraction in the force direction and the
contraction in the vertical direction, which is a direction perpendicular to the force direction,
when the elastic body is stretched or compressed. Means
[0006]
Then, in the speaker device, a sound wave is emitted at a uniform level at any position in the
axial direction of the acoustic diaphragm, and a uniform sound image is formed over the entire
acoustic diaphragm in the height (length) direction.
That is, a high quality reproduction sound field can be realized.
[0007]
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2
JP, 2007-166027, A
[0008]
By the way, the vibration type speaker device disclosed in Patent Document 1 described above is
basically configured to generate sound by vibrating one acoustic diaphragm by an actuator.
[0009]
For this reason, since the transfer characteristic of the compressional wave of the acoustic
diaphragm is determined depending on the material, thickness and the like of the acoustic
diaphragm, it is considered that the limit is determined to some extent when it is desired to
widen the coverable frequency band.
[0010]
Further, in the case of the vibration type speaker device disclosed in Patent Document 1
described above, the compressional wave is not efficiently transmitted unless the acoustic
diaphragm has a certain thickness.
For this reason, if a thin acoustic diaphragm is used in the excitation type speaker device, the
vibration can not be efficiently propagated (transmitted) throughout the acoustic diaphragm, and
a good reproduction sound field can be obtained. It is thought that there are cases where it can
not be formed.
[0011]
In view of the above, according to the present invention, even in the case of a so-called vibration
type speaker device using an actuator, it is possible to cover a wider frequency band and to use
acoustic diaphragms of various materials and thicknesses. Aim to be able to
[0012]
In order to solve the above-mentioned subject, the speaker device of the invention according to
claim 1 is provided such that an acoustic diaphragm and the acoustic diaphragm are in contact
with each other for a predetermined length, and the acoustic diaphragm is provided A vibration
transmitting member for transmitting vibration, and an actuator for generating a sound by
transmitting vibration to the acoustic diaphragm through the vibration transmitting member by
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applying the vibration corresponding to the sound signal to be reproduced to the vibration
transmitting member; Equipped with
[0013]
According to the speaker device of the first aspect of the present invention, the vibration
transmission member is provided to be in contact with the acoustic diaphragm for a
predetermined length, and the vibration transmission member responds to the sound to be
reproduced. Vibration is applied by the actuator.
[0014]
Thereby, the vibration can be efficiently transmitted to the acoustic diaphragm through the
vibration transmission member, so that the transmission efficiency (propagation efficiency) of the
vibration is improved and the frequency is wider than when the acoustic diaphragm is directly
vibrated. It is made to be able to cover a zone.
Further, by improving the transmission efficiency of the vibration to the acoustic diaphragm, it is
possible to widen the selection range of the material, thickness and the like of the acoustic
diaphragm.
[0015]
According to the present invention, in a so-called vibration type speaker device using an actuator,
the transmission efficiency of vibration to the acoustic diaphragm can be improved, and a wider
frequency band can be covered.
Further, by improving the transmission efficiency of the vibration to the acoustic diaphragm, it is
possible to widen the selection range of the material and thickness of the acoustic diaphragm.
[0016]
It is a figure for demonstrating the excitation type speaker apparatus to which one embodiment
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of this invention was applied.
It is a figure for demonstrating the structural example of the actuator used in the speaker
apparatus of this embodiment.
It is a figure for demonstrating the sound emission time difference of the audio ¦ voice emitted
from the speaker apparatus with which one embodiment of this invention was applied.
It is a figure for demonstrating the sound emission time difference of the audio ¦ voice emitted
from the excitation type speaker apparatus when not using a vibration transmission member.
FIG. 6 is a view for explaining the contact length of the vibration transfer member 2 with the
acoustic diaphragm 1; FIG. 6 is a view for explaining the contact length of the vibration transfer
member 2 with the acoustic diaphragm 1; It is a figure for demonstrating the variation of the
installation position in the case of providing the vibration transmission member 2 with respect to
the acoustic diaphragm 1, and the method of installation. It is a figure for demonstrating the
variation of the installation position in the case of providing the vibration transmission member 2
with respect to the acoustic diaphragm 1, and the method of installation. It is a figure for
demonstrating the variation of the installation position in the case of providing the vibration
transmission member 2 with respect to the acoustic diaphragm 1, and the method of installation.
It is a figure for demonstrating the variation of the installation position in the case of providing
the vibration transmission member 2 with respect to the acoustic diaphragm 1, and the method
of installation. It is a figure for demonstrating the variation of the installation position in the case
of providing the vibration transmission member 2 with respect to the acoustic diaphragm 1, and
the method of installation. It is a figure for demonstrating the variation of the installation
position in the case of providing the vibration transmission member 2 with respect to the
acoustic diaphragm 1, and the method of installation. It is a figure for demonstrating the example
at the time of forming an acoustic diaphragm in a cylindrical form. It is a figure for
demonstrating the example of the speaker apparatus using two acoustic diaphragms 1a and 1b.
It is a figure for demonstrating the vibration characteristic of magnesium and paper. It is a figure
for demonstrating the other example of the speaker apparatus using two acoustic diaphragms 1a
and 1b. It is a figure for demonstrating the example of the speaker apparatus using three
acoustic diaphragms 1a, 1b, and 1c. It is a figure for demonstrating the other example of the
speaker apparatus using three acoustic diaphragms 1a, 1b, and 1c. An application example of a
speaker device according to an embodiment of the present invention will be described.
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[0017]
Hereinafter, an embodiment of a speaker device according to the present invention will be
described with reference to the drawings.
[0018]
[Basic Configuration of Vibrating Speaker Device Described in Embodiment] FIG. 1 is a diagram
for explaining a vibrating speaker device to which an embodiment of the present invention is
applied.
[0019]
As shown in FIG. 1, the speaker device of this embodiment comprises an acoustic diaphragm 1,
vibration transmitting members 2 provided on the left and right sides of the acoustic diaphragm
1, and an actuator 3, respectively. There is.
[0020]
The acoustic diaphragm 1 is formed of, for example, an acrylic plate, and in this embodiment, the
acoustic diaphragm 1 has a thickness of, for example, 2 to 3 mm and a length of about 30 cm ×
40 cm.
Of course, this is only an example, and the thickness and size of the acoustic diaphragm 1 can be
various.
In addition to the acrylic plate, the acoustic diaphragm 1 can also be formed of, for example,
various other materials such as organic glass.
[0021]
The vibration transmitting member 2 is formed of, for example, carbon fiber (carbon fiber or
carbon nanofiber), and in this embodiment, it is formed in a rod shape (linear shape) having a
diameter of about 1 mm to several mm. It is a thing.
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Then, the vibration transfer member 2 is in contact with and fixed to the acoustic diaphragm 1.
[0022]
In addition, although the vibration transmission member 2 is formed in rod shape as mentioned
above, the shape can be made into various shapes, such as column shape, prismatic shape, plate
shape. That is, although the vibration transmission member 2 is formed in a rod shape, the shape
of the cross section can be circular, semicircular, rectangular, or other various shapes.
[0023]
The vibration transmitting member 2 is fixed to the acoustic diaphragm 1 by bonding with an
adhesive, adhesive tape or the like, heat is applied for fusion, or the acoustic diaphragm 1 is
embedded, etc. It can be done by various methods. Here, what is important is not the fixing
method, but the point in which the vibration transfer member 2 is provided in contact with the
acoustic diaphragm 1 by a predetermined length.
[0024]
In addition to the carbon fiber, the vibration transfer member 2 may be made of another material
such as a piano wire made of steel, for example. That is, the vibration transfer member 2 needs to
be a material having a small "internal loss" and a high "sound velocity", for example, a carbon
fiber or a steel material.
[0025]
Here, "internal loss" literally means a loss when vibration propagates in a solid, and in other
words, indicates whether the vibration is easily transmitted. Therefore, as the "internal loss" is
small, it means that the propagation loss is small, and "the vibration propagates efficiently". Also,
"sound velocity" means the transmission speed of an elastic wave propagating in an elastic body
or a continuous body.
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[0026]
Focusing on these internal loss and sound velocity , the material most desirable as the
vibration transfer member 2 needs to have good vibration propagation efficiency, so first of all, a
material with a small internal loss It is necessary to be there.
[0027]
Furthermore, in order to minimize the time delay of the start point (excitation point) and the end
point (location farthest from the excitation point) of the vibration transfer member 2, it is
necessary to be a material having a high "sound velocity".
[0028]
Thus, as the vibration transfer member 2, an appropriate one may be selected and used based on
the "internal loss" and the "sound velocity".
Specifically, various materials with smaller
the acoustic diaphragm 1 may be used.
internal loss
and faster
sound velocity
than
[0029]
The vibration transfer member 2 is provided such that one end thereof is exposed to the upper
end of the square hole provided in the acoustic diaphragm 1 for mounting the actuator 3
thereon.
[0030]
Thereby, when the actuator 3 is mounted in the square hole 4 of the acoustic diaphragm 1, one
end of the vibration transfer member 2 exposed at the upper end of the square hole 4 is applied
by the rod (excitation portion) of the actuator 3. You will be able to shake.
[0031]
[Configuration Example of Actuator] Here, a configuration example of the actuator 3 used in the
speaker device of this embodiment will be described.
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In the speaker device of this embodiment, various actuators such as a piezoelectric actuator, an
electrodynamic actuator, and a super magnetostrictive actuator can be used.
[0032]
The piezoelectric actuator uses an element that causes displacement by applying a voltage.
Electrokinetic actuators use a current to generate vibrations in coils and magnets.
The giant magnetostrictive actuator uses a giant magnetostrictive element whose element size
changes in response to an external magnetic field.
[0033]
Here, a configuration example of a giant magnetostrictive actuator will be described as one of
available actuators. FIG. 2 is a diagram for explaining a configuration example of the giant
magnetostrictive actuator 3 used in the speaker device of this embodiment. This example is a
case where a preload is applied to the giant magnetostrictive element, and FIG. 2 (A) is a top
view, and FIG. 2 (B) is a side sectional view.
[0034]
As an actuator body, a solenoid coil 32 is disposed around a bar-shaped giant magnetostrictive
element 31, and a magnet 33 and a yoke 34 are disposed around the solenoid coil 32.
[0035]
Further, the drive rod 35 is connected to one end of the giant magnetostrictive element 31, and
the fixed board 36 is attached to the other end of the giant magnetostrictive element 31.
[0036]
The actuator main body is loaded in an outer casing case 39 made of, for example, aluminum so
that the tip end of the drive rod 35 protrudes to the outside of the outer casing case 39.
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[0037]
Furthermore, a damping material 37 made of silicone rubber or the like is loaded on the drive
rod 35, and a screw 38 is inserted behind the fixed plate 36 to apply a preload to the giant
magnetostrictive element 31.
[0038]
In the speaker device shown in FIG. 1, the actuator 3 having the configuration shown in FIG. 2 is
mounted on and fixed to the square hole 4 of the acoustic diaphragm 1.
[0039]
In this case, a magnetostrictive characteristic is obtained in which the magnetic field range in
which the magnetostrictive value changes linearly with the change of the control magnetic field
is wide, and the change of the magnetostriction value with respect to the change of the control
magnetic field in the magnetic field range is large.
For example, the load on the giant magnetostrictive element 31 can be adjusted by compression
of a coil spring or the like disposed below the actuator 3.
[0040]
[Operation of Speaker Device of This Embodiment] When a drive current according to an audio
signal is supplied to the solenoid coil 32 of the actuator 3 having such a configuration,
supermagnetostriction is caused by the influence of the magnetic field generated accordingly.
The element 31 expands and contracts.
[0041]
Thereby, the drive rod 35 of the actuator 3 moves up and down, and the end of the vibration
transfer member 2 is hit by the drive lot 35 as shown in FIG.
In this manner, the actuator 3 applies vibration according to the audio signal to the vibration
04-05-2019
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transfer member 2 provided not in the acoustic diaphragm 1 but in contact with the acoustic
diaphragm 1.
[0042]
The vibration transmitting member 2 is a rod-like member made of carbon fiber as described
above, and as described above, has a smaller "internal loss" than the acoustic diaphragm 1 which
is an acrylic plate, and , "Sound velocity" is fast.
[0043]
For this reason, by vibrating one end of the vibration transfer member 2, the vibration efficiently
propagates through the vibration transfer member 2 and reaches the other end of the vibration
transfer member 2.
[0044]
And since the vibration transfer member 2 is provided in contact with the acoustic diaphragm 1,
the vibration applied by the actuator 3 can be efficiently conducted as compared with the case
where the acoustic diaphragm 1 is directly vibrated. Can be transmitted to one.
[0045]
As a result, the compression wave propagates efficiently in the acoustic diaphragm 1, and the
acoustic diaphragm 1 vibrates more appropriately with respect to the excitation by the actuator
3 to widen the frequency band of the sound emitted by the acoustic diaphragm 1. Can.
[0046]
[Difference in sound emission time of the sound from the acoustic diaphragm 1] Further, when
the sound velocity of the vibration transfer member 2 is faster than the sound velocity of the
acoustic diaphragm 1, the excitation axis of the sound emitted from the acoustic diaphragm 1 It
is possible to reduce the sound emission time difference in the direction.
The sound emission time difference will be specifically described.
[0047]
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11
FIG. 3 and FIG. 4 are diagrams for explaining the sound emission time difference in the excitation
axis direction of the sound emitted from the acoustic diaphragm 1.
Among these, FIG. 3 relates to the speaker device of this embodiment using the vibration transfer
member 2.
FIG. 4 relates to a speaker device that does not use the vibration transfer member 2.
[0048]
And FIG. 3 is a figure at the time of seeing the speaker apparatus shown in FIG. 1 from the side
side as arrow a shows in FIG.
As shown in FIG. 3, the vibration transfer member 2 is embedded in the acoustic diaphragm 1.
Therefore, the vibration transmission member 2 is in a state in which the entire circumference is
in contact with the acoustic diaphragm 1.
[0049]
Further, in FIG. 3, the surface indicated by the dotted line is a surface parallel to the acoustic
diaphragm 1, and the surface indicated by the solid line is the sound wave surface Au of the
sound emitted from the acoustic diaphragm 1. .
[0050]
Then, in the speaker device configured as shown in FIG. 3, when the vibration transfer member 2
is vibrated by the actuator 3, the vibration is rapidly transmitted to the entire acoustic diaphragm
1 through the vibration transfer member 2.
[0051]
In this case, in the lower part of the acoustic diaphragm 1 in the vicinity of the actuator 3, the
04-05-2019
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transmission of the vibration is faster by the part closer to the actuator 3, so the sound is emitted
slightly faster than the upper part of the acoustic diaphragm 1.
[0052]
However, since the vibration excited by the actuator 3 is also rapidly transmitted to the upper
portion of the acoustic diaphragm 1 through the vibration transmitting member 2, the lower
portion and the receiving portion of the acoustic diaphragm 1 are released. The sound time
difference can be reduced.
[0053]
Specifically, as shown in FIG. 3, an angle formed by a plane parallel to the acoustic diaphragm 1
indicated by a dotted line and the sound wave surface Au of the sound emitted from the acoustic
diaphragm 1 indicated by a solid line. It is made to be able to make beta small.
[0054]
On the other hand, as shown in FIG. 4, let us look at a vibration type speaker device which does
not use the vibration transfer member 2.
Also in FIG. 4, the surface indicated by the dotted line is a surface parallel to the acoustic
diaphragm 1, and the surface indicated by the solid line is the sound wave surface Au of the
sound emitted from the acoustic diaphragm 1.
[0055]
In the case of the vibration type speaker device which does not use the vibration transmitting
member 2 shown in FIG. 4, it takes time until the vibration given by the actuator 3 is transmitted
to the upper portion of the acoustic diaphragm 1 because the vibration transmitting member 2 is
not present It takes
[0056]
Therefore, as shown in FIG. 4, the angle α between the plane parallel to the acoustic diaphragm
1 indicated by the dotted line and the sound wave surface Au of the sound emitted from the
acoustic diaphragm 1 indicated by the solid line is , Is larger than the angle β shown in FIG.
04-05-2019
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[0057]
As can be seen by comparing FIG. 3 and FIG. 4, when the vibration transfer member 2 is brought
into contact with the acoustic diaphragm 1 and the actuator 3 vibrates the vibration transfer
member 2, the acoustic diaphragm 1 is directly The vibration can be transmitted to the whole of
the acoustic diaphragm 1 more quickly than in the case of vibration.
[0058]
Thus, by using the vibration transmitting member 2 made of a material having a smaller "internal
loss" and a faster "sound velocity" than the acoustic diaphragm 1, the vibration corresponding to
the voice is not delayed through the vibration transmitting member 2 Can be applied to the
entire acoustic diaphragm 1.
[0059]
Thereby, since the acoustic diaphragm 1 can be effectively vibrated, the frequency band of the
sound (sound) emitted by vibrating the acoustic diaphragm 1 is expanded to form a better
reproduction sound field. be able to.
Also, in other words, the sound image can be localized to the whole of the acoustic diaphragm 1
through the vibration transfer member 2, and a better reproduction sound field can be formed.
[0060]
[Contact Length of Vibration Transmission Member 2 to Acoustic Diaphragm 1] By the way, in
the case of the speaker device of the embodiment described above, the acoustic diaphragm 1 is
formed of an acrylic plate, and the vibration transmission member 2 is formed of carbon fiber. As
described in
However, the acoustic diaphragm 1 and the vibration transfer member 2 can be formed of
various materials (materials).
[0061]
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And "internal loss" and "sound velocity" are different for each material.
Therefore, depending on the material, shape, size, etc. of one or both of the acoustic diaphragm 1
and the vibration transmission member 2, the length (contact length) for causing the vibration
transmission member 2 to be in contact with the acoustic diaphragm 1 is Various adjustments
are possible.
[0062]
5 and 6 are diagrams for explaining the contact length of the vibration transfer member 2 with
the acoustic diaphragm 1. FIG.
[0063]
For example, as shown in FIG. 5A, when one or both of the acoustic diaphragm 1 and the
vibration transfer member 2 are made of a material whose internal loss is not so small and
the sound velocity is not so fast. The vibration transfer member 2 is brought into contact with the
acoustic diaphragm 1 longer.
[0064]
As shown in FIG. 5B and FIG. 5C, if the material is small in internal loss and fast in sound
velocity for one or both of the acoustic diaphragm 1 and the vibration transfer member 2. The
length of the vibration transfer member 2 to be brought into contact with the acoustic diaphragm
1 is shortened.
[0065]
Further, in order to transmit the vibration to the acoustic diaphragm 1 more efficiently by one
actuator, for example, as shown in FIGS. 6 (A), (B) and (C), 2 of the acoustic diaphragm 1 The
vibration transmission member 2 may be provided in contact with the side, the three sides, and
the four sides.
[0066]
In this case, in order to prevent deterioration of the vibration transfer characteristics of the
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vibration transfer member 2, the bent portion is made to be a curve.
It is preferable that the vibration transfer member 2 be a curve having continuity as a whole.
[0067]
As described above, according to the material, size, shape, etc. of one or both of the acoustic
diaphragm 1 and the vibration transfer member 2, desired acoustic characteristics (frequency
characteristics, time response, phase characteristics, etc.) can be realized. In addition, it is
possible to adjust variously the contact length of the vibration transfer member 2 to the acoustic
diaphragm 1.
[0068]
[Variation of Installation Position and Installation Method of Vibration Transmission Member 2]
FIGS. 7 to 12 illustrate variations of the installation position and installation method when the
vibration transmission member 2 is provided to the acoustic diaphragm 1. FIG.
[0069]
[Variation 1] In FIG. 1, one vibration transfer member 2 is provided on the left and right of the
acoustic diaphragm 1.
However, as shown in FIG. 7, it is also possible to provide one vibration transfer member 2 in the
central portion of the acoustic diaphragm 1.
In this case, one square hole 4 for mounting the actuator 3 may be used, and one actuator 3 may
be used.
[0070]
[Variation 2] Further, as shown in FIG. 1, instead of providing the vibration transfer member 2
inside the vibration transfer member 2, as shown in FIG. 2b may be provided.
[0071]
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In this case, in order to mount an actuator for applying vibration to the vibration transfer
members 2a and 2b at an appropriate position, as shown in FIG. 8, a notch is cut below the lower
end portion of the vibration transfer members 2a and 2b. The part 6 may be provided.
[0072]
As described above, the vibration transfer member 2 may be provided in contact with the side
surface of the acoustic diaphragm 1 without being limited to the case where the vibration
transmission member 2 is provided inside the acoustic diaphragm 1.
The point is that the vibration transfer member 2 may be provided in contact with the acoustic
diaphragm 1 so as to have a certain contact length with the acoustic diaphragm 1.
[0073]
In the case of the speaker device described above, by providing the square hole 4 and the notch
6 with respect to the acoustic diaphragm 1, all or part of the actuator 3 is positioned inside the
acoustic diaphragm 1. I made it.
However, it is not limited to this.
[0074]
The actuator 3 may be provided outside the acoustic diaphragm 1.
The point is that the actuator 3 can be provided at an appropriate position where vibration can
be applied to the vibration transmitting member 2 provided to be in contact with the acoustic
diaphragm 1.
[0075]
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[Variation 3] Further, although the vibration transfer member 2 is provided along the short side
of the acoustic diaphragm 1, it is not limited to this.
For example, as shown in FIG. 9, the vibration transmitting member 2a may be disposed
obliquely to the acoustic diaphragm 1.
In this case, the vibration transfer member 2 a is configured to vibrate in the directions indicated
by the double arrows in the vicinity of the vibration transfer member 2 a, and can transfer the
vibration to the acoustic diaphragm 1.
[0076]
Further, as shown in FIG. 9, as the vibration transfer member 2b is shown, the vibration transfer
member may be disposed in the longitudinal direction of the acoustic diaphragm 1 (along the
short side).
In this case, the vibration transfer member 2 b is vibrated in the directions indicated by the
double arrows in the vicinity of the vibration transfer member 2 b, and can transfer the vibration
to the acoustic diaphragm 1.
[0077]
[Variation 4] The acoustic diaphragm is formed of, for example, an acrylic plate, and can be
formed to have a curved portion.
For example, as shown in FIG. 10, it is assumed that a curved acoustic diaphragm 1a having a
curved portion is formed.
[0078]
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The vibration transmitting member is, as described above, a rod-like member made of carbon
fiber, a so-called piano wire made of steel, or the like.
Therefore, as shown in FIG. 10, the vibration transfer member 2a can be provided in contact
along the curved portion of the curved acoustic diaphragm 1a.
[0079]
In this case, the vibration transfer member 2a is vibrated in the directions indicated by the
double arrows in the vicinity of the vibration transfer member 2a, and can transfer the vibration
to the acoustic diaphragm 1a.
[0080]
Further, as shown in FIG. 10, as the vibration transfer member 2b is shown, the vibration transfer
member may be disposed in the lateral direction of the acoustic diaphragm 1a (along the long
side).
In this case, the vibration transfer member 2b is vibrated in the direction indicated by the double
arrows in the vicinity of the vibration transfer member 2b, and can transfer the vibration to the
acoustic diaphragm 1a.
[0081]
Thus, the vibration transfer member can be disposed at various positions with respect to the
acoustic diaphragm.
Also, even if the acoustic diaphragm has a curved portion, a vibration transmission member may
be disposed along the curved portion to appropriately transmit the vibration also to the acoustic
diaphragm having a curved portion. it can.
[0082]
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[Variation 5] In the example of the embodiment described above, one actuator vibrates one
vibration transmission member, but the invention is not limited to this.
It is also possible to have a configuration in which one actuator excites a plurality of vibration
transfer members, and one actuator excites a branched vibration transfer member.
[0083]
FIG. 11 is an example of a speaker device configured to vibrate the two vibration transfer
members 2 a and 2 b by the both-end actuator 5.
[0084]
In FIG. 11, the both-end actuator 5 is configured to provide the drive rod 35 and the damping
material 37 not only on the upper side but also on the lower side of the giant magnetostrictive
actuator 3 described with reference to FIG.
[0085]
Thereby, the both-ends actuator 5 vibrates the vibration transmission member 2a provided on
the left side of the acoustic diaphragm 1 by one drive rod, and the vibration transmission
member provided on the right side of the acoustic diaphragm 1 by the other drive rod. Vibrate
2b.
[0086]
Since each of the vibration transfer members 2a and 2b is provided to be in contact with the
acoustic diaphragm 1, the vibration given by the both-end actuator 5 is transmitted through the
vibration transfer members 2a and 2b. The plate 1 is efficiently transmitted.
[0087]
[Variation 6] FIG. 12 is an example of a speaker device configured using a vibration transfer
member 2c that is branched off halfway.
[0088]
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In FIG. 12, the actuator 3 has the configuration described with reference to FIG.
Further, as shown in FIG. 12, the vibration transfer member 2c used in the speaker device of this
example is configured to be branched into three on the way.
[0089]
Then, as shown in FIG. 12, one of the vibration transfer member 2 c is branched into three, one
on the left side of the acoustic diaphragm 1 and the other on the center of the acoustic
diaphragm 1. One is in contact with the right side portion of the acoustic diaphragm 1
respectively.
[0090]
Further, in the vibration transfer member 2c, the branch portion is curved.
Thereby, the transmission efficiency of the vibration is prevented from being reduced at each
branch portion of the vibration transmission member 2c.
[0091]
Then, in the case of this example, the end portion of the vibration transfer member 2c is vibrated
by the actuator 3 so that the vibration can be efficiently transmitted to the whole of the acoustic
diaphragm 1 through each portion where the vibration is branched. it can.
[0092]
As described above, vibration can be more efficiently performed by using a configuration in
which a plurality of vibration transfer members are vibrated by one actuator, or a vibration
transfer member which is branched by one actuator is vibrated. It can be transmitted to the
acoustic diaphragm 1.
[0093]
The examples shown in FIGS. 11 and 12 are merely examples, and the position at which the
vibration transfer member is provided to the acoustic diaphragm 1, the number of branches, and
the like can be made appropriate.
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[0094]
[Modified Example of Shape of Acoustic Diaphragm and Use of Acoustic Diaphragm] Incidentally,
as described above, the acoustic diaphragm is not limited to the rectangular one.
For example, various shapes such as a circle, a semicircle, a sector, a triangle, and a star can be
used.
Moreover, the acoustic diaphragm can also be made into various three-dimensional shape.
[0095]
[Example in which Acoustic Diaphragm has Three-Dimensional Shape (Modified Example 1)] FIG.
13 is a diagram for describing an example in which the acoustic diaphragm is formed in a
cylindrical shape.
As shown in FIG. 13, the acoustic diaphragm 1x formed on a cylinder has a thickness of, for
example, several mm.
[0096]
Then, inside the acoustic diaphragm 1x, vibration transmitting members 2a, 2b, 2c and 2d are at
positions excited by the actuator from the bottom side of the acoustic diaphragm 1x in the height
direction of the acoustic diaphragm 1x. It has a configuration provided.
[0097]
Each of the vibration transfer members 2a, 2b, 2c and 2d is exposed on the bottom side of the
acoustic diaphragm 1, and can be directly vibrated by an actuator.
[0098]
Thereby, even in the case of using the acoustic diaphragm 1x formed in a cylindrical shape, the
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vibration according to the audio signal is efficiently made over the entire acoustic diaphragm 1x
through the vibration transfer members 2a, 2b, 2c and 2d. Be able to communicate.
[0099]
Therefore, it is possible to realize high sound quality of the sound to be emitted, for example, the
frequency band of the sound signal that can be emitted can be further expanded.
[0100]
In addition, although the case where the acoustic diaphragm was formed in cylindrical shape was
demonstrated here, it does not restrict to this.
It is also possible to form the acoustic diaphragm into prisms of various numbers of angles, such
as in a triangular prism, a quadrangular prism, a pentagonal prism, or a hexagonal prism.
[0101]
Moreover, it is also possible to set it as various three-dimensional shapes, such as forming an
acoustic diaphragm into a spherical form, or forming into a hemispherical form.
[0102]
Then, regardless of what three-dimensional acoustic diaphragm is used, the vibration
transmission member may be provided at a position where the actuator can excite.
The number may be provided corresponding to the actuator, and the length of the vibration
transfer member may be an appropriate length.
[0103]
Further, the vibration transmitting member does not have to be embedded in the acoustic
diaphragm and may be fixed by any of various methods so as to be in contact with any position
of the acoustic diaphragm.
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[0104]
[Example of using a plurality of acoustic diaphragms (Modification 2)] As described above, by
providing a vibration transmission member in contact with the acoustic diaphragm, the actuator
can be efficiently driven through the vibration transmission member. Can transmit signals from
[0105]
Therefore, the acoustic diaphragm is not limited to the acrylic plate, and it is possible to use
paper, metals such as magnesium, plastics, and other various materials (materials).
Further, the number of acoustic diaphragms is not limited to one, and a plurality of acoustic
diaphragms may be used.
[0106]
In the following, an example in which a plurality of acoustic diaphragms are used will be
described.
In the example described below, the case where acoustic diaphragms of different materials are
used will also be described.
[0107]
[First example in the case of using a plurality of acoustic diaphragms] FIG. 14 is a diagram for
explaining an example of a speaker device using two acoustic diaphragms 1a and 1b.
As shown in FIG. 14, the acoustic diaphragm 1a is made of magnesium, and the acoustic
diaphragm 1b is made of paper.
Each of the acoustic diaphragms 1a and 1b has a certain thickness and does not curl or break
04-05-2019
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even if the user does not press it.
[0108]
And as shown in FIG. 14, the vibration transfer member 2 is provided in contact with the central
portion of each of the acoustic diaphragms 1a and 1b.
In this case, the vibration transfer member 2 is adhered to the acoustic diaphragms 1a and 1b by,
for example, an adhesive.
[0109]
As in the case of the above-described embodiment, the vibration transfer member 2 has a small
internal loss such as, for example, a rod-shaped carbon fiber or a piano wire formed by using
steel. The speed of sound is fast.
[0110]
The acoustic diaphragm 1a formed by using magnesium has a relatively small internal loss, and
responds well to vibrations in the high band (high band side).
For this reason, the acoustic diaphragm 1a is used to emit the high frequency side sound.
[0111]
In addition, the acoustic diaphragm 1b formed by using paper has a large internal loss as
compared to magnesium, and responds well to vibrations in the low region (low region).
For this reason, the acoustic diaphragm 1b is used to emit low-range sound.
[0112]
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FIG. 15 is a diagram for explaining the vibration characteristics of magnesium and paper.
As shown in FIG. 15, in the case of the acoustic diaphragm 1a formed of magnesium, it is
possible to emit high-pitched sound with high sound pressure in response to high frequency
vibration.
On the other hand, in the case of the acoustic diaphragm 1b made of paper, as shown in FIG. 15,
in response to the low frequency vibration, the sound in the low tone range can be emitted with
high sound pressure.
[0113]
Then, to the end of the vibration transfer member 2 which is made to contact each of the
acoustic diaphragms 1a and 1b, vibration according to the audio signal is applied by the actuator
3 as shown in FIG. Shake.
[0114]
Thus, the vibration according to the audio signal is efficiently transmitted to each of the acoustic
diaphragms 1a and 1b through the vibration transfer member 2, and the sound according to the
vibrations transmitted from each of the acoustic diaphragms 1a and 1b. Is emitted.
[0115]
In this case, by using the magnesium acoustic diaphragm 1a and the paper acoustic diaphragm
1b, the reproduction frequency characteristic can be expanded to the high band side and the low
band side.
That is, the reproduction frequency characteristic is comprehensively expanded, and a good
reproduction sound field can be formed.
[0116]
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[Second Example in the Case of Using a Plural Acoustic Vibrating Plates] FIG. 16 is a view for
explaining another example of a speaker device using two acoustic vibrating plates 1a and 1b.
As shown in FIG. 15, also in this example, the acoustic diaphragm 1a is formed of magnesium,
and the acoustic diaphragm 1b is formed of paper.
Also in this example, each of the acoustic diaphragms 1a and 1b has a certain thickness and does
not curl or break even if the user does not press it.
[0117]
Then, as shown in FIG. 16, in the case of this example as well, the vibration transfer member 2x
is provided in contact with the central portions of the acoustic diaphragms 1a and 1b.
Also in this example, the vibration transfer member 2x is adhered to the acoustic diaphragms 1a
and 1b by, for example, an adhesive.
[0118]
As in the case of the speaker device of the first example shown in FIG. 14, the vibration transfer
member 2 x may be, for example, a rod made of carbon fiber, a piano wire formed of steel, or the
like. The internal loss is small and the sound velocity is fast.
[0119]
However, as shown in FIG. 16, the vibration transfer member 2x of this example is configured to
be branched into two.
The bifurcated portion is curved so as not to damp the vibration as much as possible.
[0120]
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Then, as shown in FIG. 16, the end of the vibration transfer member 2 x is vibrated by the
actuator 3.
Therefore, the vibration according to the excitation by the actuator 3 is transmitted to each of the
acoustic diaphragms 1a and 1b through the vibration transmitting member 2x.
[0121]
Thus, the vibration is efficiently transmitted to each of the acoustic diaphragms 1a and 1b
through the vibration transmitting member 2x which is branched, and the vibration is
transmitted according to the vibration transmitted from each of the acoustic diaphragms 1a and
1b. Sound is emitted.
[0122]
In this case, as in the case of the speaker device described with reference to FIG. 14, by using the
magnesium acoustic diaphragm 1 a and the paper acoustic diaphragm 1 b, the reproduction
frequency can be obtained both in the high band and the low band. Characteristics can be
expanded.
That is, the reproduction frequency characteristic is comprehensively expanded, and a good
reproduction sound field can be formed.
[0123]
In the case of this example, by using the vibration transfer member 2x branched into two,
vibration is transmitted equally (equally) to each of the acoustic diaphragm 1a and the acoustic
diaphragm 1b. be able to.
[0124]
[Third Example in the case of Using a plurality of Acoustic Diaphragms] FIG. 17 is a diagram for
describing an example of a speaker device using three acoustic diaphragms 1a, 1b, and 1c.
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As shown in FIG. 17, the acoustic diaphragm 1a is formed of magnesium, and the acoustic
diaphragms 1b and 1c are formed of paper.
Also in this example, each of the acoustic diaphragms 1a, 1b, and 1c has a certain thickness and
does not curl or break even if the user does not press it.
[0125]
And as shown in FIG. 17, the vibration transmission member 2 is provided in contact with each of
the acoustic diaphragms 1a, 1b and 1c. Also in this example, the vibration transfer member 2 is
adhered to each of the acoustic diaphragms 1a, 1b, and 1c by, for example, an adhesive.
[0126]
And in the case of this example, the position which contacts the vibration transfer member 2 is
made to differ for each of acoustic diaphragm 1a, 1b, 1c. That is, the vibration transfer member 2
is in contact with the right end of the acoustic diaphragm 1a. Further, the vibration transfer
member 2 is in contact with the central portion of the acoustic diaphragm 1b. Further, the
vibration transfer member 2 is in contact with the left end side of the acoustic diaphragm 1c.
[0127]
Also in this example, as in the case of the above-described embodiment, the vibration transfer
member 2 may be, for example, a rod-shaped carbon fiber, a piano wire formed by using steel,
etc. The internal loss is small and the sound velocity is fast.
[0128]
Also in this example, as in the case of the first and second examples described above, the acoustic
diaphragm 1a formed by using magnesium is used to emit the high-frequency side sound. Be
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Also in this example, as in the case of the first and second examples described above, the acoustic
diaphragm 1b formed by using paper is used to emit low-range sound. Be
[0129]
Then, as shown in FIG. 17, the vibration according to the audio signal is applied by the actuator 3
to the end of the vibration transfer member 2 which is made to contact each of the acoustic
diaphragms 1a, 1b and 1c. It is shaken.
[0130]
Thereby, the vibration according to the audio signal is efficiently transmitted to each of the
acoustic diaphragms 1a, 1b and 1c through the vibration transmitting member 2, and the
vibrations transmitted from each of the acoustic diaphragms 1a, 1b and 1c The sound according
to is emitted.
[0131]
In this case, by using the magnesium acoustic diaphragm 1a and the paper acoustic diaphragms
1b and 1c, the reproduction frequency characteristic can be expanded to the high band side and
the low band side.
That is, the reproduction frequency characteristic is comprehensively expanded, and a good
reproduction sound field can be formed.
[0132]
[Fourth example in the case of using a plurality of acoustic diaphragms] FIG. 18 is a view for
explaining another example of a speaker device using three acoustic diaphragms 1a, 1b and 1c.
As shown in FIG. 18, also in this example, the acoustic diaphragm 1a is formed of magnesium,
and the acoustic diaphragms 1b and 1c are formed of paper. Also in this example, each of the
acoustic diaphragms 1a, 1b, and 1c has a certain thickness and does not curl or break even if the
user does not press it.
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[0133]
Then, as shown in FIG. 18, in the case of this example, the vibration transfer member 2y is
provided in contact with the central portions of the acoustic diaphragms 1a, 1b, and 1c. In this
case, the vibration transfer member 2y is adhered to the acoustic diaphragms 1a, 1b, 1c by, for
example, an adhesive.
[0134]
As in the case of the speaker devices of the first to third examples described above, the vibration
transfer member 2y may be, for example, a rod made of carbon fiber, a piano wire formed of
steel, or the like. The internal loss is small and the sound velocity is fast.
[0135]
And the vibration transfer member 2y of this example is comprised so that it might branch to
three as shown in FIG.
The bifurcated portions are curved so as not to damp the vibration as much as possible.
[0136]
Then, as shown in FIG. 18, the end of the vibration transfer member 2 y is vibrated by the
actuator 3. Therefore, the vibration according to the excitation by the actuator 3 is transmitted to
each of the acoustic diaphragms 1a, 1b, 1c through the vibration transmitting member 2y.
[0137]
Thereby, the vibration is efficiently transmitted to each of the acoustic diaphragms 1a, 1b, 1c
through the vibration transfer member 2y, and the sound according to the vibration transmitted
from each of the acoustic diaphragms 1a, 1b, 1c. Is emitted.
[0138]
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In this case, by using the magnesium acoustic diaphragm 1a and the paper acoustic diaphragms
1b and 1c, the reproduction frequency characteristic can be expanded to the high band side and
the low band side.
That is, the reproduction frequency characteristic is comprehensively expanded, and a good
reproduction sound field can be formed.
[0139]
In the case of this example, by using the vibration transfer member 2y branched into three,
vibration is transmitted equally (equally) to each of the acoustic diaphragm 1a and the acoustic
diaphragm 1b. be able to.
[0140]
[Another example in the case of using a plurality of acoustic diaphragms] The number of acoustic
diaphragms to be used can be an appropriate number.
In that case, it is also possible to set it as the structure vibrated by the actuator different for
every acoustic diaphragm. Further, as described with reference to FIGS. 16 and 18, the vibration
transfer member may be branched to transmit the vibration from one actuator to a plurality of
acoustic diaphragms. .
[0141]
In addition, the shape of the acoustic diaphragm can also be various shapes such as a circle, a
sector, a triangle and the like. Also, the shape can be made different for each acoustic diaphragm
that can receive a plurality of pieces. Also, the shape and size may be made different for each
acoustic diaphragm. For example, it is also possible to make the acoustic diaphragm emitting the
low frequency side sound larger than the acoustic diaphragm emitting the high frequency side
sound.
04-05-2019
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[0142]
Also, the material of the acoustic diaphragm is not limited to magnesium and paper. Of course, it
is also possible to use an acoustic diaphragm made of magnesium only or an acoustic diaphragm
made of paper only. Of course, it is also possible to use an acoustic diaphragm made of a material
other than magnesium or paper. For example, acoustic diaphragms made of various materials
such as plastic, glass, various fibers, etc. can be used.
[0143]
[Application Example of Speaker Device of This Embodiment (Modification 3)] FIG. 19 is a
diagram for describing an application example of the speaker device of one embodiment of the
present invention. The application shown in FIG. 19 is an example in which the speaker device
according to the embodiment of the present invention is applied to a display device such as a
television receiver, for example.
[0144]
The speaker device of this example basically has, as in the case of the speaker device described
with reference to FIG. 1 and FIG. 2, etc., for example, an acoustic diaphragm made of an acrylic
plate and vibrations of carbon fiber, piano wire, etc. It consists of a transmission member and an
actuator that excites the vibration transmission member.
[0145]
The speaker device of this example is, as shown in FIG. 19, a front surface of a display element
such as a cathode ray tube (CRT), a liquid crystal display (LCD), an organic electroluminescence
(EL) panel, or a plasma display panel (PDP). It is provided on the side.
[0146]
Specifically, as shown in FIG. 19, an acoustic diaphragm 1 of, for example, an acrylic plate is
provided on the front side of the display element 7.
In the acoustic diaphragm 1, a vibration transfer member 2L is provided on the left side of a
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frame portion 1f which is a portion around the display screen of the display element 7, and a
vibration transfer member 2R is provided on the right side of the frame portion 1f. .
[0147]
Each of the vibration transfer members 2L and 2R is provided in contact with the vibration
transfer member 1.
The actuator 3L is provided on the lower end side of the vibration transfer member 2L, and the
actuator 3R is provided on the lower end side of the vibration transfer member 2R.
[0148]
Then, to the vibration transfer members 2L and 2R, vibrations corresponding to the audio signal
are applied from the lower end side by the actuators 3L and 3R as shown by double arrows in
FIG.
[0149]
In this case, the actuator 3L generates a vibration corresponding to the left channel audio signal
among the left and right channel audio signals.
Similarly, the actuator 3R generates a vibration according to the audio signal of the right channel
among the audio signals of the left and right channels.
[0150]
Thereby, the vibration according to the audio signal of the left channel is efficiently transmitted
through the vibration transmitting member 2L mainly on the left side of the acoustic diaphragm
1, and the sound according to the transmitted vibration is transmitted to the left of the acoustic
diaphragm 1. It is made to emit sound from the left side.
[0151]
Similarly, the vibration according to the sound signal of the right channel is efficiently
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transmitted to the right of the acoustic diaphragm 1 mainly through the vibration transmitting
member 2R, and the sound according to the transmitted vibration is of the acoustic diaphragm 1
It is made to emit from the right side.
[0152]
And in this case, since the sound is emitted by vibrating the acoustic diaphragm 1 positioned on
the front side of the display screen 7 of the display element, the same direction as the display
screen of the display element on which the image is displayed The sound corresponding to the
displayed image is emitted from
[0153]
Thus, the audio to be reproduced in synchronization with the video can be emitted from the same
direction as the display screen on which the video is displayed, so that the user can listen to the
corresponding audio without discomfort as well as the video to be reproduced. Be able to do that.
[0154]
[Effects of the Embodiment] In the speaker device of this embodiment, the acoustic vibration
plate is brought into contact with the vibration transmitting member for transmitting the
compressional wave according to the vibration from the actuator, thereby providing the acoustic
vibration. The compressional waves can be efficiently transmitted to the plate.
[0155]
That is, even when the mechanical impedance matching between the acoustic diaphragm and the
actuator can not be sufficiently obtained, the use of the vibration transmitting member can raise
the transmission efficiency (propagation efficiency) of the vibration.
[0156]
Thereby, it is possible to realize a speaker device that covers a wider frequency band than in the
past.
Further, with regard to the sound image localization effect, a more uniform sound image
localization effect can be obtained over the entire acoustic diaphragm.
04-05-2019
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[0157]
In addition, by using a plurality of acoustic diaphragms made of different materials, it is possible
to realize a speaker device that covers a wider frequency band.
[0158]
Further, by making the vibration transmitting member in contact with the acoustic diaphragm, it
is possible to efficiently transmit the vibration, so that it is possible to use a material that can not
be used conventionally as the acoustic diaphragm.
[0159]
For example, thin plastic, kraft paper, thin processed magnesium plate, etc. can be used.
As a result, the acoustic diaphragm can be easily processed, and a speaker device having a
completely different design from that of a conventional speaker can be realized.
That is, the degree of freedom in design of the speaker device can be expanded.
[0160]
[Others] [Materials, Shape, Size, Etc. of Constituent Elements] As described above, various
materials, shapes, sizes of the acoustic diaphragm can be used.
In addition, various materials, shapes and sizes of the vibration transmission member can be
used.
In addition, the number of acoustic diaphragms, the number of vibration transfer members, the
number of actuators, and the like can be set as appropriate.
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[0161]
The material of the acoustic diaphragm, the shape, the size, the material of the vibration
transmission member, the shape, the size, the number of the acoustic diaphragms, the number of
the vibration transmission members, the number of the actuators, etc. The characteristics
(frequency characteristics, time response, phase characteristics, etc.) can be selected as
appropriate within a feasible range.
[0162]
Further, as described above, it has been described that the vibration transfer member 2 uses an
internal loss smaller than that of the acoustic diaphragm 1 and a high sound velocity .
Here, a specific example is shown about selection of the material of the acoustic diaphragm 1
and the vibration transmission member 2.
[0163]
For example, as a forming material of the acoustic diaphragm 1, it is conceivable to use, for
example, epoxy resin or paper (corn paper).
Here, the internal loss
sec (milliseconds).
of the epoxy resin is 0.026, and the
In addition, the internal loss
1650 m / sec (milliseconds).
sound velocity
of paper (corn paper) is 0.04, and the
is 1700 m /
sound velocity
is
[0164]
Therefore, when using an epoxy resin or paper (cone paper) as the acoustic diaphragm 1, the
vibration transmitting member 2 made of a material having an internal loss smaller than the
above-mentioned internal loss and having a higher speed of sound than the above-mentioned
speed of sound Needs to be used.
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[0165]
In this case, as a candidate of the vibration transfer member 2, for example, titanium may be
mentioned.
The "internal loss" of titanium is 0.002 and the "sound velocity" is 4950 m / sec.
Therefore, when using epoxy resin or paper (corn paper) as the acoustic diaphragm 1, for
example, by using the vibration transmission member 2 formed of titanium, the signal from the
actuator can be efficiently transmitted through the vibration transmission member 2. It can be
transmitted to the acoustic diaphragm 2.
[0166]
As described above, the vibration transfer member 2 is made of various materials having a
sufficiently small "internal loss" and a sufficiently fast "sound velocity" as compared with the
material of the acoustic diaphragm 1 used. Good.
[0167]
Also, as the actuator, various actuators such as a piezoelectric actuator, an electrodynamic
actuator, and a super magnetostrictive actuator can be used.
[0168]
Also, various types of paper can be used as the acoustic diaphragm.
For example, drawing paper, kraft paper, or other processed paper subjected to various
processing can be used.
[0169]
[Configuration Example of Vibration Transmission Member] The vibration transmission member
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2 is not limited to one having a predetermined length.
The vibration transfer member 2 may be configured to be adjustable in length. For example, the
structure of the vibration transfer member can be a structure of a so-called antenna rod in which
a plurality of vibration transfer members having different thicknesses can expand and contract.
[0170]
In addition, a plurality of vibration transmission members having screws (one-sided male screw
and one-side female screw) cut at the tip may be prepared, and a single vibration transmission
member may be configured by connecting male and female screws as needed. It is possible.
[0171]
Then, for example, the vibration transmission member of the length shown in FIG. 5 (B) and the
vibration transmission member of the length shown in FIG. 5 (C) are connected so as to be able to
expand and contract as required. Keep them ready or connect them as needed.
[0172]
Thus, for example, when the acoustic diaphragm has a relatively large internal loss, it is extended
and brought into contact, and conversely, when the acoustic diaphragm has a relatively small
internal loss. Can be adjusted by the user himself, such as adjusting to be short and touching.
[0173]
As described above, by making the length of the vibration transfer member adjustable, the
acoustic vibration plate and the vibration transfer member can be selected, for example, when
the user can select the acoustic vibration plate and the vibration transfer member. This is
convenient when it is necessary to adjust the contact state with the
[0174]
[Applicable Device, Etc.] In the above-described embodiment, the speaker device according to the
embodiment of the present invention is applied to a television receiver. However, the present
invention is not limited to this.
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It is also possible to apply the speaker apparatus of this invention other than a television
receiver.
For example, the speaker device of the present invention can be applied to a mobile phone
terminal, a portable game, and the like.
[0175]
In particular, the speaker device of the present invention can also be applied to a foldable
portable information terminal.
In the foldable portable information terminal, for example, even if an acoustic diaphragm is
provided on the display screen and an actuator is provided on the main body side, the vibration
transfer member can be bent, so it can be folded. is there.
In this case, if the vibration transfer member is in an extended state at the time of use, the
vibration can be efficiently transmitted to the acoustic diaphragm.
[0176]
The present invention can also be applied to the windshield portion of a car and other window
glass portions. Further, the speaker device of the present invention can be applied to various
positions such as a window of a house, a mirror of a bathroom or a bathroom, or a mirror of a
dresser placed in a room.
[0177]
DESCRIPTION OF SYMBOLS 1 ... Acoustic diaphragm, 2 ... Vibration transmission member, 3 ...
Actuator 4. Square hole part, 1a, 1b, 1c ... Acoustic diaphragm, 2a, 2b, 2c, 2d, 2x, 2y ... Vibration
transmission member, 1f ... Frame part 2L, 2R ... Vibration transmission member, 3L, 3R ...
Actuator, 5 ... Both end actuator, 6 ... Notch part, 7 ... Display element
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