JP2006332782

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DESCRIPTION JP2006332782
PROBLEM TO BE SOLVED: To provide a small lateral drive type speaker capable of securely
holding a diaphragm to improve sound characteristics. SOLUTION: A diaphragm 10 having a
curved surface, a frame 20 supporting both ends of the diaphragm 10, and both ends of the
diaphragm 10 supported by the frame 20 via the frame 20 according to an input signal. The
exciter 30 is driven to vibrate so that the relative distance between the parts changes, and the
vibrator 30 emits sound pressure in the direction orthogonal to the curved surface from the
curved surface of the diaphragm 10 by the vibration drive. [Selected figure] Figure 1
Lateral drive speaker
[0001]
The present invention relates to, for example, a laterally driven speaker that vibrates by driving
an end face of a curved drive plate.
[0002]
In recent years, flat panel displays have been adopted in AV (Audio Visual) equipment in which a
display and a speaker are integrated, for example, a PDP (Plasma Display Panel) television
receiver, a liquid crystal television receiver, a portable DVD player, etc. Equipment is being made
thinner.
[0003]
In addition, flat panel displays such as liquid crystal displays and organic EL displays are
generally adopted also in portable information terminal devices such as mobile phones and PDAs
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(Personal Digital Assistants), and thinning and weight reduction are being promoted.
[0004]
In such AV equipment and portable information terminal equipment, the installation space of the
speaker has become a major problem as the whole equipment is being made thinner.
In addition, even in a device on which a speaker is separately mounted, it may not be possible to
secure a large on-vehicle device or a narrow space.
Under such circumstances, the demand for thinning the speaker is further increased.
[0005]
As a speaker corresponding to such a demand, for example, a rectangular diaphragm is curved
along its length direction, one end is semi-fixed, the other end is vibratably supported via an
edge, and There is known a speaker in which a driver is attached and driven from the center to
the other end of the rear surface (for example, see Patent Document 1).
[0006]
Further, there is provided a speaker having a curved diaphragm, a coil provided at an end of the
diaphragm, and an electromagnet arranged to sandwich the coil, wherein the diaphragm is
vibrated by a magnetic driving force by the electromagnet. It is known (for example, refer patent
document 2).
[0007]
JP-A-2004-356868 (FIG. 3) JP-A-64-54899 (FIG. 3)
[0008]
In the above-described speaker, as an electrodynamic drive unit, a magnetic circuit that generates
a magnetic field, a coil formed of a conductor, a bobbin that fixes the coil, a damper that supports
the bobbin, and a magnetic circuit and a damper are integrally held. It has a frame as a main
component.
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[0009]
For example, a coil is provided on the end face of the film as the diaphragm described above, and
the coil on the end face is held in the magnetic gap of the magnetic circuit via a lubricant or a
damping material.
[0010]
In the lateral drive type speaker having the above-mentioned configuration, for example, when a
film having a relatively weak strength is used as a diaphragm, it may not be able to be reliably
held, for example, the sound characteristics may be deteriorated.
[0011]
The present invention takes an example of the problem to address such a problem.
That is, an object of the present invention is to provide a lateral drive type speaker capable of
reliably holding a diaphragm to improve sound characteristics.
[0012]
In order to achieve such an object, the lateral drive type loudspeaker according to the present
invention at least has a configuration according to each of the following independent claims.
[0013]
The lateral drive type speaker according to the invention according to claim 1 is characterized in
that a diaphragm having a curved surface, a support means for supporting both end portions of
the diaphragm, and the support means via the support means according to an input signal. And
driving means for vibrating so as to change a relative distance between both ends of the
diaphragm supported by the driving means, and emitting sound pressure in a direction
orthogonal to the curved surface from the curved surface of the diaphragm by the vibration
drive. It is characterized by
[0014]
The lateral drive type loudspeaker according to the present invention is supported by the
diaphragm having the curved surface, the support means for supporting the both ends of the
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diaphragm, and the support means via the support means according to the input signal. The
driving means is driven to vibrate so as to change the relative distance between both ends of the
diaphragm, and has driving means for emitting sound pressure in the direction orthogonal to the
curved surface from the curved surface of the diaphragm by the vibration driving as main
components .
[0015]
The driving means vibrates in response to the input signal so that the relative distance between
both ends of the diaphragm supported by the supporting means changes through the supporting
means.
The diaphragm causes sound pressure to be emitted from the curved surface of the diaphragm in
a direction orthogonal to the curved surface by the vibration drive of the drive means.
[0016]
As described above, the lateral drive type loudspeaker according to the present invention can
miniaturize the entire loudspeaker apparatus for the simple configuration.
In addition, the diaphragm can be reliably held by the support means.
For example, a thin plate such as a metal film or a resinous film can be used as the diaphragm,
and the sound characteristics can be improved.
[0017]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
FIG. 1 is an explanatory view showing a structure of a lateral drive type loudspeaker according to
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an embodiment of the present invention.
FIG. 2 is a plan view of the lateral drive speaker 1 shown in FIG.
As shown in FIGS. 1 and 2, the speaker 1 according to the present embodiment includes a
diaphragm 10, a frame 20, and an exciter 30.
The frame 20 corresponds to an embodiment of the support means according to the present
invention.
The exciter 30 corresponds to an embodiment of the drive means according to the present
invention.
[0018]
For example, as shown in FIGS. 1 and 2, the diaphragm 10 has a curved portion 11 in which a
curved surface is formed.
In detail, as shown in FIG. 1, the curved portion 11 is formed such that the upper portion of the
diaphragm 10 has a convex shape. In the present embodiment, as shown in FIG. 1, the curved
portion 11 is formed at a substantially central portion of the diaphragm 10. Further, as shown in
FIG. 2, the diaphragm 10 according to the present embodiment is formed in a rectangular shape
S. For example, as shown in FIG. 1, the bending portion 11 has a convexly curved surface on the
upper side. By changing the curvature of the curved portion 11, the sound quality of the sound
wave generated by the diaphragm 10 can be controlled. Further, the diaphragm 10 is formed
using, for example, a paper-based material, a polymer-based material such as a resin, a metalbased material, or a composite material obtained by combining them, as a base material. The
diaphragm 10 according to the present embodiment is preferably formed of, for example, a metal
foil (metal film) having high rigidity as compared to a resin film. By using a highly rigid metal foil
as the diaphragm 10, for example, the diaphragm 10 having a larger area can be formed as
compared with a diaphragm formed of a resin-based film. By increasing the area of the
diaphragm 10, the sound pressure characteristic in the low frequency range is improved.
Moreover, it is preferable that the diaphragm 10 is formed, for example with metal foil
comparatively comparatively small, such as magnesium foil. By using a metal foil with a relatively
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small specific gravity, deformation of the diaphragm 10 by its own weight can be reduced.
Further, even if the diaphragm 10 is formed thick in order to increase the rigidity of the
diaphragm 10, the weight of the diaphragm 10 can be made relatively small.
[0019]
The frame 20 supports both ends of the diaphragm 10. As shown in FIGS. 1 and 2, for example, a
frame 20 according to the present embodiment includes a first frame 21 and a second frame 22.
The first frame 21 corresponds to an embodiment of the first support means according to the
present invention. The second frame 22 corresponds to an embodiment of the second support
means according to the present invention.
[0020]
The first frame 21 supports one end 10 a of the diaphragm 10. The second frame 22 supports
the other end 10 b of the diaphragm 10. In the present embodiment, for example, as shown in
FIG. 1, the first and second frames 21 and 22 are formed in an L shape. Further, one end 21 a of
the first frame 21 is fixed or semi-fixed to one end 10 a of the diaphragm 10, and the other end
21 b is joined to one end of the exciter 30. Further, one end 22 a of the second frame 22 is fixed
or semi-fixed to the other end 10 b of the diaphragm 10, and the other end 22 b is joined to the
other end of the exciter 30.
[0021]
The exciter 30 is provided between the first frame 21 and the second frame 22. In addition,
when the signal SG1 is input from, for example, an external signal source, the exciter 30 receives
the first and second frames 21 and 22 via the first and second frames 21 and 22 according to
the signal SG1. The relative distance between the two ends of the diaphragm 10 supported by is
changed (displaced). In detail, the exciter 30 expands and contracts in a defined direction (in the
present embodiment, as shown in FIG. 1, in the X-axis direction) based on the input signal SG1.
[0022]
Further, as described above, in the present embodiment, as shown in FIGS. 1 and 2, the first and
second frames 21 and 22 support both ends of the slightly curved plane diaphragm 10, and the
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first frame 21 and The exciter 30 is disposed between the second frames 22, and the diaphragm
10, the first frame 21, the second frame 22, and the exciter 30 are integrated.
[0023]
The operation of the speaker 1 configured as described above will be described with reference to
FIGS.
When the signal SG1 is input to the exciter 30, the exciter 30 is displaced (stretched) in the Xaxis direction according to the signal SG1 as shown in FIG. The ends 21b and 22b of the first and
second frames 21 and 22 integrated with the exciter 30, respectively, are similarly displaced in
the X-axis direction according to the expansion and contraction of the exciter 30, and similarly,
the first and second frames Each end 21a, 22a of 22 is displaced in the X-axis direction.
[0024]
The relative distance between both ends of the diaphragm 10 changes at the both ends of the
diaphragm 10 due to the displacement of the first and second frames 21 and 22. Specifically,
both ends of the diaphragm 10 are displaced along the X-axis direction.
[0025]
Due to the displacement of the end portions 10a and 10b of the diaphragm 10, the substantially
central portion of the curved surface of the bending portion 11 is displaced in the direction S1 (Y
axis direction orthogonal to the X axis direction) orthogonal to the curved surface. By
displacement of the substantially central portion of the curved surface of the curved portion 11,
a compressional wave is generated in the air around the diaphragm 10, and the sound pressure
by the compressional wave is radiated in the direction S1 orthogonal to the curved surface.
[0026]
As described above, the diaphragm 10 having the curved surface, the frame 20 supporting the
both ends of the diaphragm 10, and the diaphragm supported by the frame 20 through the
frame 20 according to the input signal. The exciter 30 is driven to vibrate so that the relative
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distance between the two end portions of the 10 changes, and the exciter 30 emits sound
pressure in the direction orthogonal to the curved surface from the curved surface of the
diaphragm 10 by vibration drive. Therefore, the entire speaker device can be miniaturized.
[0027]
Moreover, since the diaphragm 10 can be reliably held by the frame 20, for example, a thin plate
such as a metal film or a resinous film can be used as the diaphragm, and sound characteristics
can be improved.
[0028]
In addition, since the diaphragms 10 are integrated with the frames 21 and 22 supporting both
ends of the diaphragm 10, the exciter 30 provided between the frames 21 and 22, and the lateral
drive type of the general configuration. Compared to the speaker, it can be miniaturized without
degrading the sound characteristics.
[0029]
Moreover, since the diaphragm 10 which concerns on this embodiment was formed with metal
foil with high rigidity, compared with the diaphragm formed, for example by the resin film, the
diaphragm 10 with a large area can be formed.
By increasing the area of the diaphragm 10, the sound pressure characteristic in the low
frequency range is improved.
[0030]
Further, by forming the diaphragm 10 with a metal having a relatively small specific gravity,
such as a magnesium foil, for example, the weight of the entire lateral drive type speaker 1 can
also be relatively reduced.
[0031]
FIG. 3 is a view for explaining a first specific example of the exciter 30 of the lateral drive type
speaker 1 shown in FIG.
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In the exciter 30 according to this specific example, a piezoelectric element 31 that expands and
contracts according to an input signal is formed between the first and second frames 21 and 22.
By the expansion and contraction of the piezoelectric element 31, the relative distance between
the end portions 21b and 22b of the first and second frames 21 and 22 is displaced in the X axis
direction, and the end portions 21a and 22a are displaced in the X axis direction.
More specifically, as shown in FIG. 3, the exciter 30 according to this specific example has first
and second piezoelectric elements 311 and 312, an exciter body 32, and a buffer member 33.
The exciter body 32 corresponds to one specific example of the holding means according to the
present invention, and the impact member 33 corresponds to one specific example of the buffer
member 33 according to the present invention.
[0032]
The first and second piezoelectric elements 311 and 312 are provided between the first and
second frames 21 and 22, and change the relative distance between the first and second frames
21 and 22 according to the input signal SG1. Stretch to make it For example, the signal SG1
having the same phase is input to the first and second piezoelectric elements 311 and 312. The
first and second piezoelectric elements 311 and 312 expand and contract in synchronization
with each other when the signal SG1 having the same phase is input. In the present embodiment,
the first and second piezoelectric elements 311 and 312 expand and contract along the X-axis
direction as shown in FIG.
[0033]
The exciter body 32 is provided between the first and second piezoelectric elements 311 and
312, and holds the first and second piezoelectric elements 311 and 312. For example, as shown
in FIG. 3, the exciter body 32 has a first holding portion 321 and a second holding portion 322.
[0034]
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The first holding portion 321 is formed between the first and second piezoelectric elements 311
and 312. The second holding portion 322 is integrated with the first holding portion 321 as
shown in FIG. 3 and is formed along the side surface portions of the first and second
piezoelectric elements 311 and 312. Specifically, as shown in FIG. 3, a convex first holding
portion 321 is formed substantially at the center of the second holding portion 322.
[0035]
One end of the first piezoelectric element 311 is joined to the end 21 b of the frame 21, and the
other end of the first piezoelectric element 311 is joined to the side 321 a of the first holder 321.
Further, one end of the second piezoelectric element 312 is joined to the end 22 b of the frame
22, and the other end of the second piezoelectric element 312 is joined to the facing side surface
322 b of the first holding portion 321. There is.
[0036]
The buffer member 33 is provided between the first and second piezoelectric elements 311 and
312 and the second holding portion 322, and buffers the vibration by the first and second
piezoelectric elements 311 and 312. The buffer member 33 has first and second buffer members
331 and 332, as shown in FIG. 3, for example.
[0037]
The first buffer member 331 is formed between the first piezoelectric element 311 and the
second holding portion 322, and the second buffer member 332 is between the second
piezoelectric element 312 and the second holding portion 322. Is formed. By providing the first
buffer member 331, it is possible to reduce the vibration transmitted to the exciter body 32,
which is generated when the first piezoelectric element 311 expands and contracts. Further, by
providing the second buffer member 332, it is possible to reduce the vibration transmitted to the
exciter body 32, which is generated when the second piezoelectric element 312 is expanded and
contracted.
[0038]
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The operation of the exciter 30 configured as described above will be described with reference to
FIGS. When the signal SG1 is input, the first piezoelectric element 311 and the second
piezoelectric element 312 expand and contract in synchronization with each other along the Xaxis direction according to the signal SG1, and the first and second frames 21 , 22 are displaced
along the X-axis direction. The first and second frames 21 and 22 displace the end portions 10a
and 10b of the diaphragm 10 along the X-axis direction by expansion and contraction by the first
piezoelectric element 311 and the second piezoelectric element 312. Due to the displacement of
the end portions 10a and 10b of the diaphragm 10, the substantially central portion of the
curved surface of the bending portion 11 is displaced in the direction S1 (Y axis direction
orthogonal to the X axis direction) orthogonal to the curved surface. By displacement of the
substantially central portion of the curved surface of the curved portion 11, a compressional
wave is generated in the air around the diaphragm 10, and the sound pressure by the
compressional wave is radiated in the direction S1 orthogonal to the curved surface.
[0039]
As described above, the exciter 30 according to the present specific example is provided between
the first frame 21 and the second frame 22 and, according to the input signal SG1, the exciter 30
of the first and second frames 21 and 22 is The first and second piezoelectric elements 311 and
312 are provided between the first and second piezoelectric elements 311 and 312 which
expand and contract so as to change the relative distance, and the first and second piezoelectric
elements 311 and 312. Since the exciter body 32 (first holding portion 321) for holding the
signal is provided, the exciter 30 of the speaker 1 is realized by a simple configuration of the two
piezoelectric elements 331 and 332 and the exciter body 32 (first holding portion 321) Thus, the
entire speaker 1 device can be miniaturized.
[0040]
In addition, the first holding portion 321 is provided between the first piezoelectric element 311
and the second piezoelectric element 312, and the first and second piezoelectric elements 311
and 312 expand and contract in the same phase according to the input signal SG1. Therefore, for
example, the lengths of the first piezoelectric element 311 and the second piezoelectric element
312 in the initial stage along the X-axis direction are set to predetermined lengths, and the
thickness of the first holding portion 321 along the X-axis direction is set. By adjusting, the
curvature of the diaphragm 10 can be easily adjusted, and the sound quality by the diaphragm
10 can be adjusted.
[0041]
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In addition, the exciter 30 is integrated with a first holding portion 321 formed between the first
and second piezoelectric elements 311 and 312 and the first holding portion 321, and the first
and second piezoelectric elements are formed. Between the second holding portion 322 and the
first and second piezoelectric elements 311 and 312 and the second holding portion 322, the
first and second Since the buffer members 33 (331, 332) for buffering the vibration by the
piezoelectric elements 311, 312 are provided, the vibration by the first piezoelectric element 311
and the second piezoelectric element 312 transmitted to the exciter body 32 is reduced, By
reducing unnecessary noises, the sound characteristics of the sound waves generated by the
diaphragm 10 are improved.
[0042]
FIG. 4 is a view for explaining a second specific example of the exciter 30 of the lateral drive type
speaker 1 shown in FIG.
The exciter 30 according to the second specific example is that a magnetostrictive element 34 is
used instead of the piezoelectric element 31 to generate a vibration to be applied to the
diaphragm 10.
Specifically, as shown in FIG. 4, the exciter 30 according to this example has a magnetostrictive
element 34, a coil 35, and an exciter body 32.
The magnetostrictive element 34 is provided between the first and second frames 21 and 22, as
shown in FIG. 4, and changes the relative distance between the first and second frames 21 and
22 according to the input signal SG1. To stretch.
[0043]
As shown in FIG. 4, the magnetostrictive element 34 according to this specific example includes a
first magnetostrictive element 341 and a second magnetostrictive element 342. The
magnetostrictive element 21 expands and contracts in response to an external magnetic field
caused by, for example, the coil portion 35 or the like. Specifically, the magnetostrictive element
21 is formed of, for example, a rare earth element, a transition metal element, or the like, and its
dimension changes in accordance with the external magnetic field.
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[0044]
For example, as shown in FIG. 4, one end portion of the first magnetostrictive element 341, 342
is joined and fixed to one end portion of the first holding portion 321. Further, the directions in
which the first and second magnetostrictive elements 341 and 342 expand and contract are
arranged along the X-axis direction. The first and second coils 351 and 352 are formed around
the first and second magnetostrictive elements 341 and 342, respectively. Specifically, as shown
in FIG. 4, the first and second coils 351 and 352 are formed concentrically with the direction in
which the magnetostrictive elements 341 and 342 expand and contract (the X-axis direction) as
a central axis. One end portions of the first and second coils 351 and 352 are joined and fixed to
the first holding portion 321.
[0045]
The exciter body 32 is provided between the first and second magnetostrictive elements 341 and
342, and holds the first and second magnetostrictive elements 341 and 342. In detail, the exciter
body 32 has a first holding portion 321 and a second holding portion 322, for example, as
shown in FIG.
[0046]
The first holding portion 321 is formed between the first and second magnetostrictive elements
341 and 342. The second holding portion 322 is integrated with the first holding portion 341 as
shown in FIG. 4 and is formed along the side surface portions of the first and second
magnetostrictive elements 341 and 342. In detail, as shown in FIG. 4, a convex first holding
portion 321 is formed in a substantially central portion of the second holding portion 322.
[0047]
The operation of the exciter 30 configured as described above will be described with reference to
FIGS. When the signal SG1 is input, the first and second coils 351 and 352 generate a magnetic
field corresponding to the signal SG1 at least near the magnetostrictive elements 341 and 342
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along the X-axis direction. For example, when an electrical signal SG1 including an AC
component as the signal SG1 is input to the first and second coils 351, 352, a variable magnetic
field is generated according to the AC component.
[0048]
The first and second magnetostrictive elements 341 and 342 expand and contract along the Xaxis direction according to the magnetic field generated by the first and second coils 351 and
352, and the first and second frames 21, Vary the relative distance of 22. Then, the relative
distance between the end portions 21b and 22b of the first and second frames 21 is displaced in
the X axis direction, and the end portions 21a and 22a are displaced in the X axis direction. The
first and second frames 21 and 22 displace the end portions 10a and 10b of the diaphragm 10
along the X-axis direction by the expansion and contraction of the first and second
magnetostrictive elements 341 and 342, respectively.
[0049]
Due to the displacement of the end portions 10a and 10b of the diaphragm 10, the substantially
central portion of the curved surface of the bending portion 11 is displaced in the direction S1 (Y
axis direction orthogonal to the X axis direction) orthogonal to the curved surface. By
displacement of the substantially central portion of the curved surface of the curved portion 11,
a compressional wave is generated in the surrounding air, and the sound pressure due to the
compressional wave is radiated in the direction S1 orthogonal to the curved surface.
[0050]
As described above, the exciter 30 according to the present specific example is provided between
the first and second frames 21 and 22, and the relative between the first and second frames 21
and 22 according to the input signal SG1. Since the first and second magnetostrictive elements
341 and 342 and the first and second 351 and 352 which expand and contract so as to change
the distance are provided, for example, compared to the exciter 30 according to the first specific
example, the magnetostrictive element The structure can be simplified, the exciter 30 can be
miniaturized, and the entire speaker 1 apparatus can also be miniaturized.
[0051]
In addition, the first holding portion 321 is provided between the first and second
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magnetostrictive elements 341 and 342, and the first and second magnetostrictive elements 341
and 342 expand and contract in the same phase according to the input signal SG1. For example,
by setting the length of the first and second magnetostrictive elements 341 and 342 along the Xaxis direction at the initial stage to a prescribed length, and adjusting the thickness of the first
holding portion 321 along the X-axis direction, for example The curvature of the diaphragm 10
can be easily adjusted, and the sound quality of the diaphragm 10 can be adjusted.
[0052]
Further, in a general lateral drive type speaker, a coil formed at the end of the diaphragm is
provided, and the coil at the end face is held in the magnetic gap of the magnetic circuit via a
lubricant or a damping material. In the speaker 1 according to the present invention, since both
ends of the diaphragm 10 are reliably held by the frame 20, for example, when the diaphragm
has a relatively thin film or film shape, the strength is relatively weak. Even if there is, the
diaphragm can be held securely.
[0053]
FIG. 5 is an explanatory diagram (equivalent circuit diagram) showing an example of a signal
supply system for the lateral drive type speaker.
FIG. 5A is a view showing the inductance (L) and the signal source S when a magnetostrictive
element is used as the exciter 30 shown in FIG.
As shown in FIG. 5A, when the signal SG1 is input to the coils 351 and 352 from the signal
source S via the terminals T1 and T2, the magnetostrictive elements 341 and 342 generate the
magnetic field generated from the coil portions 351 and 352. As a drive equivalent circuit, the
inductance (L1) is the main component.
FIG. 5 (b) is a diagram showing an equivalent circuit in the case where a piezoelectric element is
used as the exciter 30 shown in FIG. 3, and FIG. 5 (c) is a load of the signal source S by the
exciter 30 through the transformer T. The resistor R1 and the capacitor C1 are connected in
parallel. As described above, the electrical signal input to the exciter 30 can be controlled.
[0054]
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The present invention is not limited to the embodiments described above. For example, although
the coil portion 34 is formed in a cylindrical shape so as to surround the magnetostrictive
element 34 in the embodiment described above, the present invention is not limited to this form.
The coil section 34 may generate a magnetic field to be applied to expand and contract the
magnetostrictive element 34.
[0055]
In the above-described embodiment, the magnetostrictive element 34 vibrates and drives the end
of the diaphragm 10 in the X-axis direction, but the present invention is not limited to this. For
example, the magnetostrictive element 34 may vibrate the diaphragm 10 in a defined direction.
More specifically, vibration may be driven in the direction along the surface direction of the
curved portion of the diaphragm 10.
[0056]
Also, by using a piezoelectric element (multilayer piezoelectric element) having a large
mechanical impedance as the exciter 30, for example, by using a resin material or a metal plate
as a diaphragm, for example, by enlarging the area of the diaphragm, for example, Sound
pressure characteristics in the bass region can be improved.
[0057]
It is an explanatory view showing the structure of the lateral drive type speaker concerning one
embodiment of the present invention.
It is a top view of the lateral drive type speaker 1 shown in FIG. It is a figure for demonstrating
the 1st specific example of the exciter 30 of the lateral drive type speaker 1 shown in FIG. It is a
figure for demonstrating the 2nd specific example of the exciter 30 of the lateral drive type
speaker 1 shown in FIG. It is explanatory drawing (equivalent circuit schematic) which shows the
example of the signal supply system with respect to the lateral drive type speaker 1 shown in
FIG. (A) is a figure which shows the inductance (L) and the signal source S at the time of using a
magnetostriction element as the exciter 30 shown in FIG. (B) is a figure which shows the
equivalent circuit at the time of using a piezoelectric element as the exciter 30 shown in FIG. (C)
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is an equivalent circuit diagram in which a signal source S is connected in parallel to a load
resistance R1 by an exciter and a capacitor C1 via a transformer T.
Explanation of sign
[0058]
Reference Signs List 1 lateral drive type speaker 10 diaphragm 11 bending portion 11 20 frame
21 first frame 22 second frame 30 exciter 31 piezoelectric element 32 exciter body 33 buffer
member 34 magnetostrictive element 35 coil
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