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JP2015115629

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DESCRIPTION JP2015115629
To provide a speaker capable of easily performing sound quality adjustment. A speaker (1) is
provided with a laminated piezoelectric actuator (2) that expands and contracts in a longitudinal
direction according to a given voltage. One end of the laminated piezoelectric actuator 2 in the
longitudinal direction is in contact with the main surface of the base member 4, and the other
end is in contact with the main surface of the diaphragm 3. Since the area in which the laminated
piezoelectric actuator 2 contacts the diaphragm 3 is small, the degree of freedom in the
arrangement of the laminated piezoelectric actuator 2 with respect to the diaphragm 3 is high.
Therefore, by changing the position of the laminated piezoelectric actuator 2 with respect to the
diaphragm 3, the sound quality adjustment of the speaker 1 can be easily performed. [Selected
figure] Figure 2
スピーカ
[0001]
The present invention relates to a speaker that generates sound.
[0002]
In general, in a speaker, a voice signal is given to a voice coil disposed in the vicinity of a
permanent magnet, and a diaphragm is connected to the voice coil to vibrate to generate a sound.
11-05-2019
1
Thus, although a general speaker is equipped with a permanent magnet, the permanent magnet
is relatively heavy, and a rare earth such as neodymium is used for the permanent magnet.
Therefore, in recent years, a speaker that does not use a permanent magnet is desired.
[0003]
As a speaker which does not use such a permanent magnet, a piezoelectric type speaker using a
piezoelectric element (piezo element) is conventionally known (for example, refer to patent
documents 1). FIG. 16 is a view showing the main structure of a general piezoelectric speaker 91.
As shown in FIG. As shown in FIG. 16, the piezoelectric speaker 91 has a structure in which a
relatively thin plate-like piezoelectric element 92 is attached to a diaphragm 93 with an adhesive
or the like. The piezoelectric element portion 92 includes a monomorph type having a structure
using one piezoelectric element, a bimorph type having a structure obtained by bonding two
piezoelectric elements, and the like.
[0004]
Japanese Utility Model Application Publication No. 4-119200
[0005]
By the way, since the general piezoelectric speaker 91 as described above has a structure in
which the piezoelectric element portion 92 is attached to the diaphragm 93, there are few parts
where the diaphragm 93 vibrates freely, and It is easy to promote resonance.
For this reason, in general, the piezoelectric speaker 91 does not have desirable sound quality
(frequency characteristics) as a speaker. Further, since the piezoelectric speaker 91 has a low
degree of freedom in the arrangement of the piezoelectric element 92 with respect to the
diaphragm 93, it is also difficult to change the arrangement of the diaphragm 93 and the
piezoelectric element 92 to adjust the sound quality.
[0006]
For this reason, the speaker which can perform sound quality adjustment easily without using a
permanent magnet was desired.
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2
[0007]
The present invention is made in view of the above-mentioned subject, and an object of the
present invention is to provide a speaker which can perform sound quality adjustment easily.
[0008]
In order to solve the above-mentioned problems, the invention according to claim 1 is a speaker,
which is disposed between a base member, a diaphragm which vibrates to generate a sound, and
the base member and the diaphragm. And the laminated piezoelectric actuator is in contact with
the base member at one end in the longitudinal direction and the diaphragm at the other end,
and the laminated piezoelectric actuator includes the laminated piezoelectric actuator. The
diaphragm is vibrated by expanding and contracting in the direction.
[0009]
The invention according to claim 2 relates to the speaker according to claim 1, wherein the
diaphragm includes a plurality of plate members of different materials.
[0010]
The invention according to claim 3 relates to the speaker according to claim 1 or 2, wherein one
end is fixed to the base member and the other end is fixed to the diaphragm, and the coupling
member couples the base member and the diaphragm. And are further equipped.
[0011]
The invention according to claim 4 relates to the speaker according to claim 1 or 2, wherein the
cylindrical first projecting portion is provided protruding from the base member to the side of
the diaphragm, and a first screw thread is formed. And a cylindrical second projecting portion
provided on the side of the base plate from the diaphragm and having a second thread formed
thereon, the first thread and the second thread, and The base member and the diaphragm are
coupled by engaging the two.
[0012]
The invention according to claim 5 relates to the speaker according to claim 1 or 2, wherein a
cylindrical first projecting portion is provided protruding from the base member to the side of
the diaphragm and a first screw thread is formed. And a cylindrical second projecting portion
provided on the side of the vibration plate to project to the side of the base member and having a
second thread, and a cylindrical member having a third thread. The base member and the
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diaphragm are coupled by engaging the third thread with both the first and second threads.
[0013]
According to the first to fifth aspects of the invention, since the laminated piezoelectric actuator
contacts the diaphragm at the end in the longitudinal direction, the degree of freedom in the
arrangement of the laminated piezoelectric actuator with respect to the diaphragm is high.
Therefore, by changing the position of the laminated piezoelectric actuator, sound quality
adjustment of the speaker can be easily performed.
[0014]
Further, according to the invention of claim 2, in particular, since the diaphragm includes a
plurality of plate members of different materials, it is possible to suppress the peak and dip of the
frequency characteristic of the speaker.
In addition, by changing the material of the plate material, it is possible to easily adjust the sound
quality of the speaker.
[0015]
Further, according to the third aspect of the present invention, since the coupling member
couples the base member and the diaphragm, the strength of the speaker can be increased.
In addition, by changing the specification of the coupling member, the sound quality adjustment
of the speaker can be easily performed.
[0016]
Further, according to the fourth aspect of the present invention, the speaker can be easily
assembled.
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[0017]
Further, according to the fifth aspect of the present invention, the speaker can be easily
assembled.
[0018]
FIG. 1 is a perspective view showing the structure of a speaker.
FIG. 2 is a cross-sectional view showing a cross section of the speaker according to the first
embodiment.
FIG. 3 is a view showing the basic structure of the laminated piezoelectric actuator.
FIG. 4 is a cross-sectional view showing a cross section of the speaker according to the second
embodiment.
FIG. 5 is a cross-sectional view showing a cross section of the speaker according to the third
embodiment.
FIG. 6 is a cross-sectional view showing a cross section of the loudspeaker according to the
fourth embodiment.
FIG. 7 is an exploded view of the loudspeaker according to the fourth embodiment. FIG. 8 is a
cross-sectional view showing a cross section of the loudspeaker according to the fifth
embodiment. FIG. 9 is an exploded view of the loudspeaker according to the fifth embodiment.
FIG. 10 is a diagram showing an example of the configuration of the speaker. FIG. 11 is a view
showing an example of a speaker provided with a protective member. FIG. 12 is a view showing
an example of a speaker provided with a protective member. FIG. 13 is a view showing an
example of a speaker provided with a cone-shaped diaphragm. FIG. 14 is a view showing an
example of a speaker provided with a dome-shaped diaphragm. FIG. 15 is a view showing an
example of a speaker provided with a composite diaphragm. FIG. 16 is a diagram showing the
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main structure of a general piezoelectric speaker.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0020]
<1.
First Embodiment> FIG. 1 is a perspective view showing a configuration of a loudspeaker 1
according to a first embodiment. FIG. 2 is a cross-sectional view showing a cross section of the
speaker 1. In the following description, for convenience of explanation, the direction along the
top and bottom of the sectional view is referred to as "vertical direction", and the direction along
the left and right of the sectional view is referred to as "horizontal direction". In addition, the
term which shows these directions is only for convenience, and when actually arrange |
positioning the speaker 1 to arrangement | positioning object, the "up-down direction"
demonstrated below does not need to be along an actual vertical direction, The "horizontal
direction" need not be along the actual horizontal direction.
[0021]
As shown in FIGS. 1 and 2, the speaker 1 mainly includes a base member 4, a diaphragm 3, and a
laminated piezoelectric actuator 2.
[0022]
The base member 4 is a plate-like member having a substantially circular main surface and
serves as a reference member.
The base member 4 is fixed to the placement target of the speaker 1. In the case where the
speaker 1 is disposed, for example, in such a manner as to arrange the instrument panel in the
vehicle compartment of the vehicle, the base member 4 is fixed to the instrument panel. In this
description, the main surface of the base member 4 is in the horizontal direction.
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[0023]
The diaphragm 3 is a plate-like member that vibrates to generate a sound. The diaphragm 3 has
a substantially circular main surface, and is disposed on the upper side of the base member 4 so
that the main surface extends in the horizontal direction. Therefore, the main surface of the
diaphragm 3 and the main surface of the base member 4 face each other and are disposed
substantially in parallel.
[0024]
The diaphragm 3 is configured by overlapping two plate members 31 and 32. The two plates 31
and 32 included in the diaphragm 3 are materials different from each other. As materials of such
plate members 31 and 32, metals such as aluminum, iron and copper, ABS resin, acrylic resin,
resins such as polycarbonate, paper, wood and the like can be considered.
[0025]
It is desirable that the resonance frequency of the two plates 31 and 32 provided in the
diaphragm 3 be largely different. For this reason, when one of the two plates 31 and 32 is a
metal, the other is desirably made of a material (such as resin) other than the metal. Of course, as
long as the materials are different from each other, both of the two plate members 31 and 32
may be metal, and both may be resin.
[0026]
The laminated piezoelectric actuator 2 is an actuator that expands and contracts in the
longitudinal direction according to a given voltage. Such a laminated piezoelectric actuator has
characteristics such as high response to a signal, high accuracy of displacement amount, and low
power consumption. Hereinafter, the laminated piezoelectric actuator 2 is simply referred to as
“actuator 2”.
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[0027]
FIG. 3 is a view showing the basic structure of the actuator 2. As shown in FIG. 3, the actuator 2
is, for example, a rod-like one in which 100 to 200 plural piezoelectric elements (piezo elements)
21 are stacked. An electrode is disposed on each of the plurality of piezoelectric elements 21.
When a signal whose voltage fluctuates is applied to the electrode, actuator 2 linearly expands or
contracts (displaces) in the longitudinal direction (direction of arrow A1 in the figure) which is
the laminating direction of piezoelectric element 21 in response to the signal. Do.
[0028]
As shown in FIGS. 1 and 2, the actuator 2 is disposed between the main surface of the base
member 4 and the main surface of the diaphragm 3. The actuator 2 is arranged such that its
longitudinal direction is along the vertical direction. Therefore, the longitudinal direction of the
actuator 2 is substantially orthogonal to the main surface of the base member 4 and the main
surface of the diaphragm 3.
[0029]
One end of the actuator 2 in the longitudinal direction is in contact with the main surface of the
base member 4, and the other end in the longitudinal direction of the actuator 2 is in contact
with the main surface of the diaphragm 3. Therefore, the actuator 2 expands and contracts
according to the audio signal when the audio signal in which the voltage fluctuates is given, and
vibrates the diaphragm 3 in contact. Thereby, a sound is generated from the diaphragm 3.
Therefore, the speaker 1 can generate sound without using a permanent magnet.
[0030]
In addition, as shown in the figure, a plurality of columns 5 extending in the vertical direction are
provided between the base member 4 and the diaphragm 3. The base member 4 and the
diaphragm 3 are coupled via the plurality of columns 5 serving as coupling members. The lower
ends of the columns 5 are fixed to the base member 4 in contact with the main surface of the
base member 4, and the upper ends of the columns 5 are fixed to the diaphragm 3 in contact
with the main surface of the diaphragm 3.
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[0031]
The lower end of each support 5 is formed with an internal thread 5b to be engaged with the
external thread 62, and the upper end of each support 5 is formed with an internal thread 5a to
be engaged with the external thread 61. The male screw 62 is inserted from the lower portion of
the base member 4 and engaged with the female screw 5 b at the lower end of the support 5 to
fix the lower end of the support 5 to the base member 4. On the other hand, the male screw 61 is
inserted from the upper portion of the diaphragm 3 and engaged with the female screw 5 a at
the upper end of the support 5 to fix the upper end of the support 5 to the diaphragm 3. Thus,
since the support 5 couples the base member 4 and the diaphragm 3, the strength of the speaker
1 can be increased.
[0032]
The length in the vertical direction of each support 5 is shorter than the length in the
longitudinal direction when the actuator 2 is contracted most. Therefore, the actuator 2 is
sandwiched and fixed between the main surface of the base member 4 and the main surface of
the diaphragm 3.
[0033]
Thereby, the end in the longitudinal direction of the actuator 2 directly contacts the main surface
of the base member 4 and the main surface of the diaphragm 3 without interposing an adhesive
or other material that absorbs vibration. Therefore, expansion and contraction of the actuator 2
can be directly transmitted to the diaphragm 3. As a result, it is possible to faithfully reflect the
waveform of the audio signal on the vibration of the diaphragm 3 and to make distortion and
noise less likely to occur in the sound generated by the diaphragm 3.
[0034]
As described above, the speaker 1 according to the present embodiment includes the actuator
(multilayer piezoelectric actuator) 2 that expands and contracts in the longitudinal direction
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according to the applied voltage. One end of the actuator 2 in the longitudinal direction is in
contact with the main surface of the base member 4, and the other end is in contact with the
main surface of the diaphragm 3. The position of the actuator 2 may be the center of the
diaphragm 3 or may be a position off the center of the diaphragm 3. Since the area in which the
actuator 2 contacts the diaphragm 3 is small, the degree of freedom in the arrangement of the
actuator 2 with respect to the diaphragm 3 is high. Therefore, the sound quality adjustment of
the speaker 1 can be easily performed by variously changing the position of the actuator 2 with
respect to the diaphragm 3 in the development process. As a result, the frequency characteristic
of the speaker 1 can be made a desired frequency characteristic according to the purpose of use
of the speaker 1. In general, when the actuator 2 is disposed at a position away from the center
of the diaphragm 3, the frequency characteristic of the speaker 1 can be made flat.
[0035]
Further, since the diaphragm 3 includes two plate members 31 and 32 of different materials,
even if one plate member resonates, the other plate member suppresses the resonance.
Therefore, the peak and dip of the frequency characteristic of the speaker 1 can be suppressed,
and the frequency characteristic of the speaker 1 can be made flat. Moreover, in the development
process, the sound quality adjustment of the speaker 1 can be easily performed by variously
changing the combination of the materials of the two plate members 31 and 32.
[0036]
In the development process, the material of the base member 4 can also be changed.
Furthermore, in the development process, the specifications (number, material, position, etc.) of
the support 5 which is a connecting member for connecting the base member 4 and the
diaphragm 3 can be changed. As described above, the sound quality adjustment of the speaker 1
can be easily performed by variously changing the material of the base member 4 and the
specification of the support 5. As materials of the base member 4 and the support 5, metals such
as aluminum, iron and copper, and resins such as ABS resin, acrylic resin and polycarbonate can
be considered.
[0037]
<2. Other Embodiments> Also, the tone quality adjustment of the speaker 1 can be performed
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by setting the mode in which the base member 4 and the diaphragm 3 are combined to a mode
different from that in the first embodiment. Hereinafter, another embodiment will be described in
which the aspect of connecting the base member 4 and the diaphragm 3 is different. The main
configuration of the speaker 1 of the other embodiments is substantially the same as that of the
first embodiment, and therefore, differences from the first embodiment will be mainly described
below.
[0038]
<2−1. Second Embodiment> First, a second embodiment will be described. FIG. 4 is a crosssectional view showing a cross section of the speaker 1 according to the second embodiment.
[0039]
In the speaker 1 of the second embodiment, the length of the male screw 61 is longer than that
of the first embodiment. Further, each of the plurality of columns 5 serving as the coupling
member is cylindrical, and has a hollow inner hole 5c. Further, a female screw 4 a is formed at a
portion of the base member 4 in contact with each support 5.
[0040]
The male screw 61 is inserted from the top of the diaphragm 3, penetrates the inner hole 5 c of
the support 5, and engages with the female screw 4 a of the base member 4. Thereby, the lower
end of each support 5 is fixed to the base member 4 and the upper end is fixed to the diaphragm
3, and the base member 4 and the diaphragm 3 are coupled via the plurality of supports 5.
[0041]
As described above, in the speaker 1 of the second embodiment, since the support post 5 is fixed
to both the base member 4 and the diaphragm 3 by one male screw 61, the number of parts as
the speaker 1 can be reduced.
[0042]
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A thread may be formed in the inner hole 5 c of the support 5, and the support 5 may function as
a female screw that engages with the male screw 61.
Also, conversely to the above, the diaphragm 3 may be formed with a female screw that engages
with a male screw. In this case, the male screw is inserted from the lower portion of the base
member 4, penetrates the inner hole 5 c of the support 5, and engages with the female screw of
the diaphragm 3.
[0043]
<2−2. Third Embodiment> Next, a third embodiment will be described. FIG. 5 is a crosssectional view showing a cross section of the speaker 1 of the third embodiment.
[0044]
In the speaker 1 according to the third embodiment, the plurality of support columns 41 serving
as coupling members and the base member 4 are integrated into a single member. Thus, the
lower ends of the columns 41 are fixed to the base member 4.
[0045]
In addition, a female screw 41 a is formed at the upper end of each support column 41. The male
screw 61 is inserted from the upper portion of the diaphragm 3 and engaged with the female
screw 41 a at the upper end of the column 41 to fix the upper end of the column 41 to the
diaphragm 3. Thus, the base member 4 and the diaphragm 3 are coupled via the plurality of
columns 41.
[0046]
As described above, in the speaker 1 of the third embodiment, the base member 4 and the
plurality of columns 41 are integrated. And since the male screw 61 is used only for the fixation
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of the upper end of each support | pillar 41, the number of parts as the speaker 1 can be
decreased. Note that, contrary to the above, even if the plate member 32 on the lower side of the
diaphragm 3 and the plurality of support columns are constituted by a single member and
integrated, and male screws are used only for fixing the lower ends of the respective support
columns. Good.
[0047]
<2−3. Fourth Embodiment> Next, the fourth embodiment will be described. FIG. 6 is a crosssectional view showing a cross section of the speaker 1 of the fourth embodiment. In the speaker
1 of the fourth embodiment, the base member 4 and the diaphragm 3 are coupled without using
the male screws 61 and 62 as independent parts.
[0048]
FIG. 7 is an exploded view (cross-sectional view) of the speaker 1 according to the fourth
embodiment. In the speaker 1 of the fourth embodiment, a first projection 42 is provided on the
base member 4 so as to protrude upward (toward the diaphragm 3 side) from the main surface
of the base member 4. The first protrusion 42 has a hollow cylindrical shape with a circular cross
section as viewed in the vertical direction.
[0049]
The base member 4 and the first projecting portion 42 are constituted by a single member and
integrated. Thus, the lower end of the first protrusion 42 is fixed to the base member 4. A screw
thread 42a is formed on the inner periphery of the first protrusion 42, and the first protrusion
42 functions as a female screw as a whole.
[0050]
Further, in the diaphragm 3, a second projection 33 is provided so as to project downward (from
the base member 4) from the main surface of the diaphragm 3. The second protrusion 33 also
has a hollow cylindrical shape with a circular cross section as viewed in the vertical direction.
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[0051]
The lower plate 32 of the diaphragm 3 and the second projecting portion 33 are constituted by a
single member and integrated. Thereby, the upper end of the second protrusion 33 is fixed to the
diaphragm 3. The diameter of the outer periphery of the second protrusion 33 substantially
matches the diameter of the inner periphery of the first protrusion 42. A screw thread 33a is
formed on the outer periphery of the second projecting portion 33, and the second projecting
portion 33 functions as a male screw as a whole.
[0052]
When assembling the speaker 1 of the fourth embodiment, the actuator 2 is disposed between
the base member 4 and the diaphragm 3, and the diaphragm 3 is abutted from above the base
member 4. Then, the diaphragm 3 is rotated in a predetermined direction relative to the base
member 4 about an axis extending in the vertical direction.
[0053]
Thereby, as shown in FIG. 6, the screw thread 33a of the 2nd protrusion part 33 as a male screw
engages with the screw thread 42a of the 1st protrusion part 42 as a female screw. As a result,
the first projecting portion 42 and the second projecting portion 33 become a coupling member,
and the base member 4 and the diaphragm 3 are coupled. The actuator 2 is sandwiched and
fixed between the main surface of the base member 4 and the main surface of the diaphragm 3.
[0054]
Thus, in the speaker 1 of the fourth embodiment, the base member 4 and the diaphragm 3 can
be coupled without using the male screws 61 and 62 as independent parts, so that the speaker 1
can be easily assembled. . Note that, contrary to the above, the first protrusion 42 may function
as a male screw, and the second protrusion 33 may function as a female screw.
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[0055]
<2−4. Fifth Embodiment> Next, a fifth embodiment will be described. FIG. 8 is a crosssectional view showing a cross section of the speaker 1 of the fifth embodiment. Also in the
speaker 1 of the fifth embodiment, the base member 4 and the diaphragm 3 are coupled without
using the male screws 61 and 62 as independent parts.
[0056]
FIG. 9 is an exploded view (cross-sectional view) of the speaker 1 according to the fifth
embodiment. In the speaker 1 according to the fifth embodiment, the first projecting portion 43
is provided on the base member 4 so as to protrude from the main surface of the base member 4
to the upper side (the side of the diaphragm 3). The first protrusion 43 has a hollow cylindrical
shape with a circular cross section as viewed in the vertical direction.
[0057]
The base member 4 and the first projecting portion 43 are constituted by a single member and
integrated. Thus, the lower end of the first protrusion 43 is fixed to the base member 4. A screw
thread 43a is formed on the inner periphery of the first protrusion 43, and the first protrusion
43 functions as a female screw as a whole.
[0058]
Further, a second projection 34 is provided on the diaphragm 3 so as to project downward (from
the base member 4 side) from the main surface of the diaphragm 3. The second protrusion 34 is
also in the shape of a hollow cylinder having a circular cross section as viewed in the vertical
direction.
[0059]
The lower plate 32 of the diaphragm 3 and the second projecting portion 34 are constituted by a
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single member and integrated. Thus, the upper end of the second protrusion 34 is fixed to the
diaphragm 3. The diameter of the inner periphery of the second protrusion 34 is substantially
the same as the diameter of the inner periphery of the first protrusion 42. A screw thread 34 a is
formed on the inner periphery of the second protrusion 34, and the second protrusion 34 also
functions as a female screw as a whole.
[0060]
Moreover, the speaker 1 of 5th Embodiment is equipped with the spacer 7 which is a hollow
cylindrical member with a circular cross section seen from the up-down direction. The upper and
lower ends of the spacer 7 are open. The diameter of the outer periphery of the spacer 7 is
substantially the same as the diameter of the inner periphery of the first protrusion 42 and the
second protrusion 34. A thread 7a is formed on the outer periphery of the spacer 7, and the
spacer 7 functions as a male screw as a whole. As a material of the spacer 7, a metal such as
aluminum, iron, copper and the like, and a resin such as an ABS resin, an acrylic resin, and a
polycarbonate can be considered.
[0061]
When assembling the speaker 1 of the fifth embodiment, the actuator 2 is disposed inside the
spacer 7 and the base member 4 is abutted from the lower side of the spacer 7 and the
diaphragm 3 is abutted from the upper side of the spacer 7 Let Then, the base member 4 and the
diaphragm 3 are respectively rotated in predetermined directions relative to the spacer 7 about
an axis extending in the vertical direction.
[0062]
Thereby, as shown in FIG. 8, both of the screw thread 43 a of the first protrusion 43 as a female
screw and the screw thread 34 a of the second protrusion 34 as a female screw can be used. The
screw thread 7a engages. As a result, the first projecting portion 43, the second projecting
portion 34, and the spacer 7 become a coupling member, and the base member 4 and the
diaphragm 3 are coupled. The actuator 2 is sandwiched and fixed between the main surface of
the base member 4 and the main surface of the diaphragm 3 in a state of being contained in the
spacer 7.
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[0063]
Thus, in the speaker 1 of the fifth embodiment, the base member 4 and the diaphragm 3 can be
coupled without using the male screws 61 and 62 as independent parts, so that the speaker 1
can be easily assembled. . Note that, contrary to the above, the first protrusion 43 and the second
protrusion 34 may function as a male screw, and the spacer 7 may function as a female screw.
[0064]
<3. Modifications> Although the embodiment of the present invention has been described
above, the present invention is not limited to the above embodiment, and various modifications
are possible. Below, such a modification is demonstrated. All forms including the above-described
embodiment and the forms described below can be combined as appropriate.
[0065]
In the above embodiment, the speaker 1 is provided with the coupling member such as the
support 5, and the base member 4 and the diaphragm 3 are coupled via the coupling member.
On the other hand, as shown in FIG. 10, the speaker 1 may not have the coupling member. Also
in this case, it is desirable that the end of the actuator 2 be in direct contact with the main
surface of the base member 4 and the main surface of the diaphragm 3 without an adhesive that
absorbs vibration. For this reason, in this case, for example, as shown in FIG. 10, the adhesive B is
attached to the outer periphery of the end of the actuator 2 so that the end of the actuator 2 and
the main surfaces of the base member 4 and the diaphragm 3 are Bonding is desirable.
[0066]
Further, the speaker 1 may be provided with a protective member for protecting the diaphragm
3. FIG. 11 and FIG. 12 show an example of the speaker 1 provided with the grille 8 as a
protective member. The grill 8 is arranged to cover the upper part of the diaphragm 3 in order to
prevent the diaphragm 3 from coming into contact with foreign matter. It is fixed to the support
5 together with the diaphragm 3 by a grill 8, for example, a male screw 61.
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[0067]
Moreover, although the base member 4 fixed to arrangement | positioning object was
demonstrated as a plate-shaped member in the said embodiment, if the base member 4 has the
main surface facing the diaphragm 3, it is a plate-shaped member It does not have to be.
[0068]
Moreover, in the said embodiment, although the diaphragm 3 was comprised by the two board |
plate materials 31 and 32, you may comprise with one board | plate material.
Conversely, the diaphragm 3 may be composed of three or more plate members. When the
diaphragm 3 includes three or more plate members, it is desirable that the materials of the three
or more plate members be different from each other. Further, in the above embodiment, the
shape of the main surface of the diaphragm 3 is substantially circular, but may be another shape
such as oval or rectangular.
[0069]
Moreover, although the diaphragm 3 comprised by the flat board | plate material was employ |
adopted in the said embodiment, you may employ | adopt the diaphragm of another type. For
example, as shown in FIG. 13, a cone-shaped diaphragm 33 may be employed. In this case, one
end of the actuator 2 in the longitudinal direction is in contact with the central portion of the
diaphragm 33, and the actuator 2 vibrates in the longitudinal direction by vibrating the
diaphragm 33 in the longitudinal direction. Further, as shown in FIG. 14, a dome-shaped
diaphragm 34 may be employed. In this case, one end of the actuator 2 in the longitudinal
direction is in contact with the central portion of the diaphragm 34, and the actuator 2 vibrates
in the longitudinal direction by vibrating the diaphragm 34 in the longitudinal direction.
[0070]
In addition, a composite diaphragm in which diaphragms of different types are combined may be
adopted. For example, as shown in FIG. 15, the diaphragm 35 etc. which piled up and combined
the diaphragm 36 comprised with a planar board | plate material and the diaphragm 37 of dome
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shape can be employ | adopted. Since the frequency characteristics of the diaphragms of
different types are largely different, the frequency characteristics of the speaker 1 can be made
flat by adopting such a composite diaphragm.
[0071]
Reference Signs List 1 speaker 2 actuator 3 diaphragm 4 base member 5 support 7 spacer
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