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JPH04313999

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DESCRIPTION JPH04313999
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker using a giant magnetostrictive vibrator having positive or negative magnetostriction
characteristics as a vibration drive source.
[0002]
2. Description of the Related Art In a conventional loudspeaker of this type, an alternating
magnetic field generated by a voice current flowing in a movable voice coil is supported within a
static magnetic field of an annular magnetic gap of a magnetic circuit incorporating a permanent
magnet. In general, a dynamic type speaker which vibrates a vibrating force generated in a voice
coil by driving the conical diaphragm directly connected thereto due to the induction action of In
addition, as a device using a fixed solid vibration drive source, a voltage is applied to the
piezoelectric element to change the outer shape, and the temporal change is transmitted to the
diaphragm as a vibration source and expanded. There is a piezoelectric (ceramic) speaker or the
like having a function of generating sound in a frequency range.
[0003]
Therefore, in the driving by the above-mentioned dynamic type vibration source, the magnetic
field space in the magnetic gap intervenes with the voice coil, and the voice coil is movable. In
the above-mentioned audio frequency range, the drive impedance of the diaphragm is extremely
low because the vibration mass is extremely low because the vibration mass is extremely low.
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There was a problem that the efficiency was only 3% or less.
[0004]
Therefore, in order to solve the conventional problems of the present invention, the permanent
magnet of the magnetic source of the applied magnetic field, the voice coil of the drive source,
and the giant magnetostrictive vibrator of the vibration source are integrated with all three. The
purpose is to provide a speaker using a super-magnetostrictive transducer having positive or
negative magnetostrictive characteristics, which is fixed to a housing and further fixed directly to
the end of a super-magnetostrictive transducer at a free end to a diaphragm. Do.
[0005]
SUMMARY OF THE INVENTION The constitution of the present invention for achieving the object
will be described with reference to FIGS. 1 to 17 corresponding to the embodiments. Magnetic
sources (3a) and (3b) for applying a static magnetic field in the long axis direction of a long
columnar super magnetostrictive oscillator (1) having magnetostrictive characteristics, and
provided in the longitudinal axis direction of the super magnetostrictive oscillator (1 ') A voice
coil (2) to which an alternating magnetic field is applied is fixedly wound around the periphery,
and an actuator (11) having a base (1a) fixed to an inner bottom (4b) of a housing (4) is attached
to a frame (6) A small circular support (6b) of a support (6a) fixed to the actuator (11) side of the
frame (6), and a circular diaphragm (5) attached to the outer periphery of the frame (6)
Concentrically support the back side of the The heart is a tip speaker which is fixed attached to
the free end (1b) of the super magnetostrictive transducer (1 ').
[2] A magnetic source (3a), (3b) for applying a static magnetic field in the long axis direction of a
long columnar giant magnetostrictive oscillator (1 ′) having positive magnetostriction
characteristics, comprising the giant magnetostrictive oscillator (1 ′) The voice coil (2) for
applying an alternating magnetic field in the longitudinal direction of) is fixedly wound around
the actuator, and the actuator (11 ') is fixed with the base (1a) to the inner bottom (4b) of the
housing (4). Small circular support of concentric circular supports (6a) attached to the frame (6)
and fixed to the holding frame (6 ') attached to the outer periphery to the frame (6) on the front
side of the diaphragm (5) The part (6b) is suspended on the frame (6) and fixed to the front of
the diaphragm (5) attached to the outer periphery and supported, and the free end of the super
magnetostrictive vibrator (1 ') 1b) attached to the rear face of the diaphragm (5) It is a mosquito.
[3] The speaker according to [2], wherein the shape of the diaphragm (5) is elliptical. [4] The
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speaker according to [2], wherein the shape of the diaphragm (5) is rectangular. [5] The speaker
according to [3], wherein a mounting position of the free end (1b) of the super magnetostrictive
vibrator (1 ') to the diaphragm (5) is an eccentric position. [6] The speaker according to [3],
wherein a mounting position of the free end (1b) of the super magnetostrictive vibrator (1) to the
diaphragm (5) is an eccentric position. [7] Both end portions (1b) and (1b ′) of the giant
magnetostrictive vibrator (1 ′ ′) inside the joint portion (5c) of the two flat plate-like
diaphragms (5a) and (5b) joined at one end ) And the actuator (11 ′ ′) using the giant
magnetostrictive vibrator (1 ′ ′) attached thereto. [8] The end portion (5e) on the smaller
dimension side of the flat diaphragm (5f) whose dimension at one end portion (5d) is larger than
the other end portion (5e) is the actuator (11), (11 ') Speaker attached). [9] Ends (5e) on the
smaller dimension side of two flat diaphragms (5g) and (5h) having a size such that the size of
one end (5d) is larger than the other end (5e) This is a speaker in which both end portions (1b)
and (1b ′) of the giant magnetostrictive vibrator (1 ′ ′) of the actuator (11 ′ ′) are fixedly
attached to the inside of each joined portion (5c) of bonding. [10] A speaker according to the
above [9], in which two junctions (5c) and (5c) are joined back to back.
[0006]
Since the speaker [1] of the present invention has such a structure, the magnetostriction
characteristic in which the axial vibration proportional to the alternating magnetic field
generated by the current flowing through the voice coil is negative The free end vibrates in the
giant magnetostrictive vibrator, and it is driven with good transmission efficiency to the
diaphragm fixed directly to it, and the center of the diaphragm is bounded by the small-diameter
circular restraint support portion of the diaphragm. It is possible to make a sound by making a
node vibration in which a part is drawn.
[0007]
Since the speaker [2] of the present invention has such a structure, the supermagnetostrictive
property of the magnetostrictive characteristic in which the axial vibration proportionate to that
by the alternating magnetic field generated by the current flowing through the voice coil is
positive. The free end is vibrated in the vibrator, and it is efficiently driven to the circular
diaphragm fixed directly to it fixedly fixed to the circular diaphragm, and the central part is
bounded by the small diameter circular restraint support part of the diaphragm. It is possible to
make a sound by making a popping node vibration.
[0008]
Embodiments of the present invention will be described with reference to the drawings.
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FIGS. 1 to 3 show one embodiment of the speaker [1] of the present invention, wherein in the
embodiment [1], (11) is an actuator, and (1) is incorporated in it. A giant magnetostrictive
vibrator with long columnar negative magnetostrictive properties such as rare earth metal single
crystals such as dysprosium, the base end (1a) of which is fixed to the inner bottom (4a) of the
housing (4), and the other end (1b) Is projected as a free vibration end.
In the vicinity of the base end (1a), an annular permanent magnet (3a) is mounted and disposed
through the hole in the housing (4), and another similar annular permanent magnet (3b), The
super magnetostrictive oscillator is fixed by attaching it so as to surround and surround the
vicinity of the free end (1b) so that the child (1) does not touch, In (1), a bias static magnetic field
is applied in the axial direction. The super magnetostrictive vibrator (1) can achieve a high
efficiency of several hundred times or more compared to the conventional magnetostrictive
vibrator. The permanent magnets (3a) and (3b) of the magnetic force source may be replaced by
direct current electromagnets.
[0009]
A voice coil (4) is wound and fixed around the outside of the giant magnetostrictive vibrator (1),
and the voice current input to the voice coil (2) flows by the voice current. An alternating
magnetic field acts in the longitudinal direction. The actuator (11) used in the speaker according
to the present invention is structured as described above, and the free vibration end (1b) of the
giant magnetostrictive vibrator (1) is directly connected to the diaphragm (5) and fixed. It is
constructed.
[0010]
The concentric form of the support (6a) fixed to the side of the actuator (11) of the frame (6)
while the bottom of the housing (4) of the actuator (11) of such structure is attached to the inner
surface of the frame (6). The back side of the circular diaphragm (5) suspended and attached to
the frame (6) is supported as a small-diameter circle by the support portion (6b) of the super
magnetostrictive vibrator (1 A speaker with the free end (1 b) of (Negative) When the
magnetostrictive oscillator (1) is contracted in the axial direction at the same time by the action
of the static magnetic field and the alternating magnetic field, the diaphragm (5) Since the small
diameter circular node circle constrains and the center part vibrates in the retracted position, the
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acoustic radiation area of the diaphragm (5) becomes larger and the reproduction of high power
becomes possible. Further, as shown in FIG. 2, the actuator (11) is not the inner bottom of the
housing portion (4) but the base end portion (1 a) of the vibrator (1), and the pole face of the
permanent magnet (3 a ′) You may fix so that it may closely̲contact ¦ adhere.
[0011]
1 to 4 show an embodiment of the loudspeaker [2] of the present invention, which is an
embodiment of the loudspeaker [2] and (11 ') is an actuator, (1') Is a super magnetostrictive
oscillator having a long columnar positive magnetostrictive property such as rare earth metal
single crystal such as dysprosium incorporated therein, and its base end (1a) is fixed to the inner
bottom (4b) of the housing (4) The end (1b) is protruded as a free vibrating end. In the vicinity of
the base end (1a), an annular permanent magnet (3a) is mounted and disposed through the hole
in the housing (4), and another similar annular permanent magnet (3b), The super
magnetostrictive vibration is fixed by a magnetic source, which comprises two permanent
magnets (3a) and (3b), fixed so as to surround and surround the vicinity of the free end (1b) so
that the child (1 ′) does not touch A bias static magnetic field is applied to the child (1 ') in the
axial direction. The super magnetostrictive vibrator (1 ') can achieve a high efficiency of several
hundred times or more compared to the conventional magnetostrictive vibrator. The permanent
magnets (3a) and (3b) of the magnetic force source may be replaced by direct current
electromagnets.
[0012]
A voice coil (2) is wound and fixed around the outside of the giant magnetostrictive transducer (1
′), and the giant magnetostrictive transducer (1 ′) is input by the voice current flowing into the
voice coil (2) and flowing. In the longitudinal direction of), an alternating magnetic field is
applied. The actuator (11 ′) used in the speaker according to the present invention has the
above-described structure, and the vibrating plate of the vibration load load of the free vibrating
end (1b) of the giant magnetostrictive vibrator (1 ′) It is directly connected to 5) and fixed.
[0013]
While attaching the bottom of the housing (4) of the actuator (11 ') of such a structure to the
inner surface of the frame (6), the inner surface of the holding frame (6') attached to the front of
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the diaphragm (5) The back surface side of a circular diaphragm (5) attached to the frame (6) by
suspending the outer periphery thereof is supported by a concentric circular support (6b) of a
fixed support (6a) in a small diameter circle, This is a speaker in which the free end (1b) of the
super magnetostrictive vibrator (1 ') is attached and fixed to the center on the back side.
(Positive) When this happens, the giant magnetostrictive vibrator (1 ′) simultaneously stretches
and contracts in the axial direction in the axially elongated posture by the action of the static
magnetic field and the alternating magnetic field, so that the diaphragm (5) Because it is
restrained by a small diameter circular nodal circle and vibrates in a posture in which the central
part protrudes, the acoustic radiation area of the diaphragm (5) becomes larger and the
reproduction of high output becomes possible.
[0014]
In addition, as shown in FIG. 2, the actuator (11) has a proximal end (1a) of the vibrator (1 ′)
that is not an inner bottom of the housing (4) but a permanent magnet (3a ′). It may be fixed so
as to be in close contact with the magnetic pole surface of
[0015]
The loudspeaker shown in FIG. 7 is a diaphragm in which the circular diaphragm (5) of the
loudspeaker shown in FIG. 5 described above is an elliptical shape, and the division vibration of
the diaphragm generated in the circular diaphragm (5) is suppressed This is a speaker that
improves the reproduced sound by eliminating and flattening the sound pressure frequency
characteristics.
[0016]
In the loudspeaker shown in FIG. 8, by using the circular diaphragm (5) of the loudspeaker
shown in FIG. 5 as a rectangular diaphragm, the division vibration of the diaphragm generated in
the circular diaphragm (5) is suppressed. A speaker having a flat sound pressure frequency
characteristic by eliminating peaks and valleys to improve reproduction sound quality, which can
improve the radiation space factor of the diaphragm.
[0017]
The speaker shown in FIG. 9 is a speaker provided with the drive supporting point of the
diaphragm (5) of the speaker shown in FIG. 5 eccentrically provided, and the radial distance from
the vibration source to the outer periphery of the diaphragm is Because they are all different,
there is an effect that the nodal division vibration does not occur.
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[0018]
The loudspeaker shown in FIG. 10 is a loudspeaker provided with the drive fulcrum (1b) of the
diaphragm (5) of the loudspeaker shown in FIG. 7 eccentrically provided, and from the vibration
source leading to the outer periphery of the diaphragm. Since all the radial distances are
different, there is an effect that the nodal division vibration does not occur.
[0019]
The loudspeakers shown in FIGS. 11 and 12 have a giant magnetostrictive vibrator (1 ′ ′)
inside the junction (5c) of two flat diaphragms (5a) and (5b) joined at one end. A speaker using
an actuator (11 ′ ′) attached by fixing both end portions (1b) and (1b ′) of the upper and
lower sides. Since the energy is transmitted from the both ends (1b) and (1b ′) to the
diaphragms (5a) and (5b), it is a highly efficient speaker in which the acoustic radiation
resistance is halved.
[0020]
The speaker shown in FIG. 13 has an end (5e) on the smaller dimension side of a flat diaphragm
(5f) whose dimension at one end (5d) is larger than that at the other end (5e). It is a speaker
which attached actuator (11) or (11 '), and is a diaphragm (5f) which is hard to get on a standing
wave, and is a speaker with few generation of resonance noise.
[0021]
The speaker shown in FIG. 14 is an end on the smaller dimension side of the flat diaphragms (5g)
and (5h) whose dimension at one end (5d) is larger than that at the other end (5e). A speaker in
which the small ends (5e) of diaphragms (5g) and (5h) with actuators (11) or (11 ') attached to
(5e) are joined (5c), and it is difficult for standing waves to get on It is a speaker with little
generation of resonance noise.
[0022]
The loudspeaker shown in FIG. 15 is a loudspeaker in which two pairs of the loudspeakers
described in FIG. 14 are joined back-to-back with the junctions (5c) and (5c). It is a speaker
obtained.
[0023]
Although the embodiments which are considered to be representative of the present invention
have been described above, the present invention is not necessarily limited to only the structure
of these embodiments, and includes the constituent features referred to in the present invention,
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and the present invention In order to achieve the purpose mentioned above, the present
invention can be suitably modified and implemented within the range having the effects
mentioned below.
[0024]
As is apparent from the above description, according to the speaker of the present invention, the
giant magnetostrictive vibration of the magnetostrictive characteristic in which the axial
vibration proportional to the alternating magnetic field generated by the current flowing through
the voice coil is negative. The vibration may be transmitted to the free end of the vibrator to
vibrate and be transmitted to the fixed and fixed plate directly fixed to the vibrator with a low
transmission impedance, so that the sound may be emitted efficiently. It is possible to expect the
remarkable effect of being able to
[0025]
Also, since the structure is simple and the coils are fixed, and the vibrating portion is restrained
by the circular restraint portion of the diaphragm to perform nodal vibration, the peripheral
portion is amplified to a large amplitude according to the principle of leverage. In addition, due to
the high impedance vibration transmission mechanism, the speaker can be efficiently
regenerated with high conversion efficiency, and is highly reliable and small, so that the speaker
has the advantage of being able to be handled easily without particular care.
[0026]
As already apparent from the above description, according to the speaker of the present
invention, axial vibration proportional to the alternating magnetic field generated by the current
flowing in the voice coil is generated inside the super magnetostrictive vibrator having positive
magnetostrictive characteristics. The vibration is transmitted to the free end of the vibrator to
vibrate, and the transmission impedance is low directly to the vibration plate attached and fixed
to the vibration plate, so that the transmission efficiency can be transmitted efficiently, and the
sound can be emitted. It is possible to expect a positive effect.
[0027]
In addition, since the structure is simple and the coils are fixed, and the vibrating portion is
restrained by the circular restraint portion of the diaphragm, and the node vibrates, the
peripheral portion is amplified to a large amplitude by the lever principle. In addition, due to the
high impedance vibration transmission mechanism, the speaker can be efficiently regenerated
with high conversion efficiency, and is highly reliable and small, so that the speaker has the
advantage of being able to be handled easily without particular care.
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[0028]
Brief description of the drawings
[0029]
1 is a cross-sectional view showing the structure of the actuator used in the speaker of the
present invention.
[0030]
2 is a cross-sectional view showing another structure of the actuator used in the speaker of the
present invention.
[0031]
3 is a plan view of an embodiment using a giant magnetostrictive vibrator of negative
magnetostrictive characteristics of the speaker of the present invention.
[0032]
4 is a cross-sectional view of an embodiment shown in FIG. 3 using a giant magnetostrictive
vibrator of negative magnetostrictive characteristics of the speaker of the present invention.
[0033]
5 is a plan view of an embodiment using a super magnetostrictive vibrator of positive
magnetostrictive characteristics of the speaker of the present invention.
[0034]
6 is a cross-sectional view of an embodiment shown in FIG. 5 using a super magnetostrictive
vibrator of positive magnetostrictive characteristics of the speaker of the present invention.
[0035]
7 is a partial plan view of an embodiment using an elliptical diaphragm of the speaker of the
present invention.
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[0036]
8 is a partial plan view of an embodiment using a rectangular diaphragm of the speaker of the
present invention.
[0037]
9 is a partial plan view of an embodiment in which the actuator is eccentrically mounted using a
circular diaphragm of the speaker of the present invention.
[0038]
10 is a partially cutaway plan view of an embodiment in which the actuator is eccentrically
mounted using an elliptical diaphragm of the speaker of the present invention.
[0039]
Fig. 11 An embodiment in which two rectangular flat diaphragms of the speaker according to the
present invention are attached by fixing both ends of the giant magnetostrictive vibrator to the
inside of the joint where the ends on the short dimension side are joined. It is a front view of.
[0040]
Fig. 12 An embodiment in which two rectangular flat diaphragms of the speaker according to the
present invention are attached by fixing both ends of the giant magnetostrictive vibrator to the
inner side of the joint where the ends on the short dimension side are joined. It is a sectional side
view of (FIG. 11).
[0041]
FIG. 13 is a front view of an embodiment in which an actuator is attached to an end on the
smaller side by using a flat diaphragm in which the size of one end of the inventive speaker is
larger than that of the other end.
[0042]
The two flat diaphragms whose dimensions at one end of the invention speaker are larger than
the other end are placed inside the joint portion of the end portion of each short dimension side
joined, It is a front view of the speaker which joined each two junctions back to back with the
speaker which adhered and attached the both-ends part.
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[0043]
Fig. 15 Two flat plate-like diaphragms whose dimensions at one end of the speaker according to
the present invention are larger than those at the other end It is a sectional side view of a
speaker which joined each two junctions back to back with a speaker which adhered and
attached an end part of both ends.
[0044]
16 is a cross-sectional view enlarging one of the actuator of the speaker described in FIG. 15
described above.
The other half is drawn dotted and partially omitted.
[0045]
Explanation of sign
[0046]
DESCRIPTION OF SYMBOLS 1 giant magnetostrictive vibrator 1 'giant magnetostrictive vibrator
1 "giant magnetostrictive vibrator 1a base 1b free tip 1b' free tip 2 voice input coil 3a permanent
magnet for applied magnetic field 3b permanent magnet for applied magnetic field 4 housing 4b
inner bottom 5 diaphragm 5a diaphragm 5b diaphragm 5c joint 5d end 5e end 5g diaphragm 5h
diaphragm 5h diaphragm 5f diaphragm 6 frame 6a support 6b support 11 actuator 11 'actuator
11' 'actuator
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