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JP2004350159

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DESCRIPTION JP2004350159
The present invention provides an excitation device that can be mounted on the exterior of
various electronic devices. An excitation member 32A having a shape elongated in the X
direction is provided on a vibrating substrate 31 elongated in the X direction, and both ends of
the excitation member 32A are fixed to the vibrating substrate 31. Further, a piezoelectric
element 33 functioning as a vibration generating means is provided at an intermediate portion in
the X direction of the excitation member 32A. The vibration substrate 31 is fixed to the exterior
of the electronic device, and the vibration of the excitation member 32A is transmitted to the
exterior through the vibration substrate 31, and is emitted from the exterior. [Selected figure]
Figure 9
Excitation device for sound generation and electronic device provided with the excitation device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
excitation device that can be mounted on the exterior of an electronic device and an electronic
device equipped with the device. [0002] As a panel-shaped speaker, there is a speaker shown in
Patent Document 1 below. In Patent Document 1, a small panel smaller than the large panel is
stacked and provided on a large panel, and an exciter is provided on the small panel. In this
speaker, when the exciter is driven, the small panel is vibrated, and the vibration of the small
panel is transmitted to the large panel and sounded from the large panel and the small panel.
[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-505814 SUMMARY OF
THE INVENTION However, a portable small-sized electronic player or the like can not have a
built-in speaker, and can not use headphones or headphones. It is possible to connect external
speakers and watch music etc. When mounting a planar speaker on such an electronic device, it
is necessary to output a loud sound to a certain extent, so it is necessary to mount a diaphragm
formed with a predetermined area or more. This requires a large space for incorporating the
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diaphragm. The present invention solves the above-mentioned conventional problems, and can
be easily incorporated into various electronic devices, and further, an excitation device capable of
outputting with a sound pressure higher than a predetermined level, and an electronic device
provided with the same. Intended to be provided. According to an exciting apparatus of the
present invention, a vibration substrate which can be attached to any position of an exterior part
of an electronic device and a vibration are given to the vibration substrate via the vibration
substrate. And vibration generating means for causing the exterior portion to sound. In this case,
the vibration substrate can be configured to be provided with a pressure-sensitive adhesive layer
that can be fixed to the exterior portion. Further, the vibration generating means may be
configured to be given an electric current based on an audio signal so that an audio or music is
produced from the exterior part. Further, in the electronic device of the present invention, a
vibration substrate is attached to the exterior portion of the electronic device, and vibration
generating means for giving vibration to the vibration substrate is provided, and the vibration is
generated by the vibration generating means. The vibration is transmitted to the exterior portion
through the vibration substrate, and the exterior portion is made to sound. Further, the vibration
generating means may be configured to be supplied with a current based on an audio signal so
that sound or music is produced from the exterior portion.
As described above, in the excitation device or the electronic device described above, the exterior
portion of the computer, various household electronic devices, or the portable electronic device
serves as a sound producing body, and voice or music can be produced from this exterior
portion. . FIG. 1 is an exploded perspective view showing an example of an excitation device
mountable on the surface of a display panel, and FIG. 2 is a cross-sectional view taken along line
2-2 of FIG. The excitation device 10 shown in FIG. 1 has a transparent substrate 2, an excitation
member 3 A, and vibration generating means 4. The transparent substrate 2 is formed in a
square plate shape of a highly transparent material such as, for example, acrylic resin,
polycarbonate, and glass. The excitation member 3 A is made of, for example, a magnetic
material such as iron or ferrite, and has an area sufficiently smaller than that of the transparent
substrate 2. The excitation member 3A is mounted from a surface on the Z2 side at a position on
the Y2 side of the periphery of the transparent substrate 2. The excitation member 3A has an
elongated shape in which the longitudinal dimension is formed long when the X direction is the
vertical direction and the Y direction is the horizontal direction. In the excitation member 3A,
fixing portions 3a and 3b fixed to the transparent substrate 2 are formed at both end portions
facing in the vertical direction. That is, in the embodiment shown in FIG. 1, both ends of the
excitation member 3A in the X direction are formed to be bent in an L-shape. In the present
embodiment, the excitation member 3A functions as a magnetic yoke. The excitation member 3A
has bent portions 3c and 3d in which the edge portions on the Y1 side and the Y2 side are bent
perpendicularly to the transparent substrate 2 side respectively, and has a shape when viewed in
the YZ plane. It is U-shaped. The bent portions 3c and 3d extend in the longitudinal direction
from the fixed portion 3a to the fixed portion 3b. The bent portions 3c and 3d function as
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opposed yokes in the present embodiment. When the fixing portions 3 a and 3 b are fixed to the
transparent substrate 2, the dimensions thereof are set so that the tips of the bent portions 3 c
and 3 d do not contact the transparent substrate 2. As shown in FIG. 1, the fixing portions 3a and
3b formed on the excitation member 3A are a distance L1 to the edge 2a on the X1 side of the
transparent substrate 2 and a distance L1 to the edge 2b on the X2 side. And are fixed at
positions equal to one another. However, it is not necessary to set equal distances. The vibration
generating means 4 has a coil 5 and a magnet 6, the coil 5 is fixed to the transparent substrate 2
side, and the magnet 6 is fixed to the excitation member 3 A side.
Furthermore, a yoke 7 is provided on the surface of the magnet 6 on the Z1 side in an
overlapping manner. Note that, contrary to the above, the coil 5 may be provided on the side of
the excitation member 3A, and the magnet 6 may be provided on the side of the transparent
substrate 2. As shown in FIGS. 1 and 2, the coil 5 is wound in a square ring along the surface of
the transparent substrate 2 and a vertical direction in which current flows in the vertical
direction (X direction) of the excitation member 3A. The conduction paths 5a1 and 5a2 are
formed longer than the lateral conduction paths 5b1 and 5b2 through which current flows in the
lateral direction (Y direction) of the excitation member 3A. The magnet 6 is formed of a
permanent magnet, and has an elongated shape elongated in the longitudinal direction (X
direction). The magnet 6 is fixed to an intermediate portion in the X direction of the excitation
member 3A via an adhesive or the like. Further, the magnet 6 has an elongated shape in which
side surfaces 6a and 6b opposite to the longitudinal direction current passage 5a1 are longer
than end faces 6c and 6d opposite to the lateral direction current passage 5b1. Further, the
longitudinal length dimension of the longitudinal direction energization paths 5a1 and 5a2 is
formed to be slightly longer than the dimension in the longitudinal direction of the magnet 6, and
the longitudinal dimension of the lateral direction energization paths 5b1 and 5b2 Is set to be
slightly longer than the longitudinal length of the magnet 6 so that the magnet 6 can be inserted
into the inside of the coil 5. In the present embodiment, the magnet 6 is set to be magnetized
such that the Z 1 side is N pole and the Z 2 side is S pole. However, the Z1 side may be the S pole
and the Z2 side may be the N pole. The yoke 7 is formed of a magnetic material such as iron or
ferrite, and has the same area as the magnet 6. The thickness dimension of the yoke 7 is set such
that the tip surface of the yoke 7 on the Z1 side when stacked on the magnet 6 is substantially
the same as the tips of the bent portions 3c and 3d of the excitation member 3A. A longitudinal
conduction path 5a1 is positioned in the gap G1 between the bent portion 3c, the magnet 6 and
the yoke 7, and a longitudinal direction passing in the gap G2 between the bent portion 3d, the
magnet 6 and the yoke 7 Electrical path 5a2 is located. Thus, in the present embodiment, a
magnetic circuit is constituted by the excitation member 3 A, the magnet 6, the yoke 7 and the
coil 5. At this time, the magnetic field B1 crosses from the Y2 side to the Y1 side with respect to
the longitudinal direction conductive path 5a1 of the coil 5, and the magnetic field B2 crosses
from the Y1 side to the Y2 side with respect to the longitudinal direction conductive path 5a2.
Do.
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Therefore, when the current based on the audio signal is applied from the front side to the back
side of the drawing to the longitudinal conduction path 5a1, the driving force F1 acts on the
excitation member 3A from the longitudinal conduction path 5a1 and the other In the vertical
direction conduction path 5a2, a current flows from the back side to the front side in the
drawing, and the driving force F1 acts on the excitation member 3A from the vertical direction
conduction path 5a2. The excitation members 3A are deformed to project in the Z2 direction by
the driving forces F1 and F1. Further, when current in the opposite direction to the above based
on the audio signal flows to the vertical direction conductive paths 5a1 and 5a2, the driving
forces F2 and F2 act on the excitation member 3A from the vertical direction conductive paths
5a1 and 5a2. The excitation member 3A is deformed in the Z1 direction. When the transparent
substrate 2 and the excitation member 3 A are compared in the same area, the elastic coefficient
of the transparent substrate 2 is set higher than the elastic coefficient of the excitation member 3
A. Is set so as to be less likely to be bent and deformed than the excitation member 3A.
Therefore, when the driving forces F1 and F2 are generated, the excitation member 3A is
vibrated in the Z1-Z2 direction from the transparent substrate 2, and the vibration is transmitted
through the fixing portions 3a and 3b of the excitation member 3A. 2, and sound, music and the
like are produced from the transparent substrate 2. At this time, since the excitation member 3A
is vibrated with a large amplitude, the vibration substrate 2 can be vibrated to a large degree, and
the sound pressure can be increased. As shown in FIG. 1, in the excitation device 10, a
rectangular frame-shaped elastic member 8 is fixed around the transparent substrate 2 from the
surface on the Z2 side. Then, a square frame-shaped frame 9 is adhesively fixed to the elastic
member 8. The elastic member 8 is formed of, for example, a foamed polyethylene resin, but is
not limited to this, and may be a rubber-based member such as synthetic rubber or silicone
rubber, or It may be a member made of another resin composition. The frame 9 is formed of
metal, synthetic resin, or the like, and a reinforcing portion 9a is formed in which the inner
peripheral edge portion of the frame is bent vertically toward the Z1 side. By forming the
reinforcing portion 9a, the frame 9 is not easily bent and deformed. Further, at one corner of the
frame 9, a quadrangular attachment portion 9 b parallel to the surface of the transparent
substrate 2 is integrally formed. The above-described excitation device 10 can be configured as a
display device having a sound generation function by being superimposed on the front surface of
a thin display panel such as liquid crystal or organic EL (electroluminescence).
For example, as shown in FIG. 11, the excitation device 10 can be provided on a display panel
101 of a mobile phone 100 as an electronic device. In this case, the frame 9 may be adhered and
fixed around the surface of the display panel 101, or the frame 9 may be fixed around the
display window 100b of the exterior 100a of the mobile phone 100. It may be As shown in FIG.
17, in the display device, the frame 9 is fixed to the edge 101 a outside the display area R of the
surface of the display panel 101 rather than the display area R, and is formed on the exterior
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100 a of the mobile phone 100. It inserts from the back side of the exterior part 100a with
respect to the display window 100b, and is fixed. In this case, the outer peripheral edge of the
frame 9 is formed laterally longer than the outer peripheral edge of the transparent substrate 2,
and the frame 9 is inserted when the display device is inserted from the back side of the display
window 100b. The outer peripheral edge portion of the is locked by the back surface 100c of the
exterior 100a. Thus, the display device is prevented from coming off the display window 100b.
At this time, the surface 100d of the exterior portion 100a and the surface of the transparent
substrate 2 may be set to be flush with each other so that the surface is smooth. The transparent
substrate 2 can also constitute a part of the input panel. The input panel is formed in a sheet
shape, and is a coordinate input means capable of inputting various operation data by moving a
finger, a pen or the like on the sheet surface. As this coordinate input means, there are resistance
type, capacitance type and the like, and for example, it can be constituted by a detection sheet in
which transparent electrodes facing each other are provided on a pair of transparent resin
sheets. The input panel formed in this manner can be arranged in front of or behind the
transparent substrate 2. In addition, the transparent substrate 2 can be configured to be used as
one sheet of the detection sheet. FIG. 3 is a modification of the excitation device 10 shown in FIG.
This embodiment is the same in all other configurations as the configuration of the excitation
member 3A is different. The same reference numerals are given to the same parts and the
description thereof is omitted. The excitation member 3B shown in FIG. 3 has an elongated shape
in which the length dimension in the longitudinal direction (X direction) is longer than the width
dimension, and the edge portions on the Y1 side and Y2 side in the width direction are bent to
the Z1 side The bent portions 3e and 3f are formed extending in the longitudinal direction. The
bent portions 3e and 3f are entirely bent from the end on the X1 side to the end on the X2 side.
At both end portions in the longitudinal direction of the excitation member 3B, square fixing
portions 11a and 11b are fixed to the surface on the Z1 side via an adhesive or the like. The
fixing portions 11a and 11b are made of, for example, a foam of acrylic resin, and are formed to
be elastically deformable. In addition, about the elastic modulus of said fixing ¦ fixed part 11a,
11b, it can change suitably from high thing to low thing, and can be applied. Therefore, also in
the embodiment shown in FIG. 3, when current based on the audio signal or music signal flows in
the coil 5, the excitation member 3B is Z1 due to the magnetic driving force induced in the
vertical direction current paths 5a1 and 5a2. -Vibrated in the Z2 direction. Then, the vibration of
the excitation member 3B is transmitted to the transparent substrate 2 via the fixing portions
11a and 11b, and sound and music are produced from the surface of the transparent substrate 2.
Also in the embodiment shown in FIG. 3, the excitation device 10 is installed on the surface of the
display panel 101 so that the image of the display panel 101 can be viewed through the
transparent substrate 2 and sound generation from the surface of the display panel 101 It can be
done. FIG. 4 shows an excitation device that can be mounted on the exterior of an electronic
device or the like. The excitation device 20 has a vibrating substrate 21 which is opaque to light
such as black. The vibrating substrate 21 is formed of a non-conductive member such as a
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synthetic resin, and is in the shape of a strip having a dimension in the X direction longer than a
dimension in the Y direction. Similar to FIG. 3, both ends in the longitudinal direction of the
excitation member 3 B are fixed to the vibrating substrate 21 via fixing portions 11 a and 11 b.
Further, the coil 5 as the vibration generating means is fixed to the vibration substrate 21, and
the magnet 6 and the yoke 7 are fixed to the excitation member 3B. A frame-like frame 23
elongated in the X direction is opposed to the vibrating substrate 21, and an elastic member 22 A
is interposed and fixed between the vibrating substrate 21 and the frame 23. ing. The frame 23 is
also formed in a frame shape elongated in the X direction, similarly to the vibrating substrate 21.
Further, in the frame 23, a reinforcing portion 23a in which the inner peripheral edge portion is
bent and an attaching portion 23b are integrally formed at one corner of the inner peripheral
edge portion. As shown in FIG. 12, the excitation device 20 can be mounted, for example, on a
small electronic dictionary 110 as an electronic device (device main body). In this case, the
electronic dictionary 110 is installed in a region indicated by an alternate long and short dash
line R2 located around the display window 112 of the exterior portion 111.
However, it is not limited to this area. As a method of attaching the excitation device 20 to the
electronic dictionary 110, as shown in FIG. 15, a recess 114 is formed in the part of the soundproduction vibrating body 111 a of the exterior part 111. The excitation device 20 is provided.
The sound-production vibrating body 111a is a portion of a case (housing) which is located on
the outermost side of various electronic devices and is formed of a synthetic resin or metal. In
this case, an inwardly projecting locking portion 111 b is formed on the inner wall on the back
side in the recess 114, and when the excitation device 20 is inserted from the outside of the
exterior portion 111, the excitation device 20. The frame 23 is locked to the locking portion
111b. At this time, the depth dimension of the concave portion 114 and the thickness dimension
of the excitation device 20 are set to be the same, so that the surface of the vibration substrate
21 and the surface of the sounding oscillator 111 a of the exterior portion 111 are flush with
each other. it can. Further, as shown in FIG. 16, in the case where holes 111 s having the same
diameter to the back surface are formed in the exterior portion 111, the outer diameter of the
frame 23 is the outer diameter of the vibrating substrate 21. It is formed larger than that, and the
excitation device 20 is inserted from the back side of the exterior part 111 and mounted. As a
result, the outer peripheral edge portion of the frame 23 is locked by the back surface 111 c of
the exterior portion 111, and the drive device 20 is prevented from coming off the hole 111 s
and falling off. The excitation device 20 can be mounted on a PDA (Personal Digital Assistant)
120 as an electronic device, as shown in FIG. In the PDA 120, a rectangular display window 121a
is formed in the exterior part 121, and a handwriting input unit that can be input using the
display panel 122, a plurality of pressing input units 123, and a pen 126 in the display window
121a. 124 are provided. And the whole display window 121a is covered with a transparent
protective panel. Further, around the display window 121 a of the exterior part 121, a plurality
of push button type operation parts 125 are provided. The PDA 120 can be installed in the area
indicated by the alternate long and short dash line R3 around the display window 121a or
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around the display panel 122 indicated by the alternate long and short dash line R4. As
described above, since it can be installed in an area other than the display area of the display
panel 122, the sound generation function can be added without narrowing the visible range of
the user. It can also be used as a feedback function that gives the user the feeling of operation
while performing an input operation with the pen 126.
Further, the installation position of the excitation device is not limited to the regions R3 and R4,
but may be other positions on the surface, the back side, and the side surface. FIG. 5 shows a
modification of the excitation device 20, but the other configuration is the same as that of the
excitation device shown in FIG. 4 except for the configuration of the elastic member. The elastic
member 22 B in the excitation device 20 shown in FIG. 5 is formed to be elongated in a square
rod shape, and is fixed along the periphery of the vibration substrate 21. Since the elastic
member 22A shown in FIG. 4 is formed by punching out the members in a frame shape, many
waste portions are generated in the process of manufacturing one elastic member 22A, which is
disadvantageous in cost. In the elastic member 22B shown in 5, since the waste as described
above is hardly caused, the yield of the material can be remarkably improved. FIG. 6 shows still
another modified example of the excitation device 20 shown in FIGS. 4 and 5. The configuration
of the elastic member and the vibration generating means is different from the above. The elastic
member 22C shown in FIG. 6 includes longitudinal elastic portions 22c1 and 22c2 extending in
the X direction (longitudinal direction) and lateral elastic portions 22c3 and 22c4 extending in
the Y direction (lateral direction). In the elastic member 22C, the tip end surface of the
longitudinal elastic portion 22c1 on the X2 side is located on the end side surface of the
transverse elastic portion 22c4 on the Y2 side, and the tip end surface of the lateral elastic
portion 22c4 on the Y1 side is the X2 side of the longitudinal elastic portion 22c2 Of the
longitudinal elastic portion 22c2 is located on the end side surface of the lateral elastic portion
22c3 on the Y1 side, and the distal end surface of the lateral elastic portion 22c3 is on the side of
the longitudinal elastic portion 22c1. It is fixed to the vibrating substrate 21 so as to be
positioned on the end side surface on the X1 side. In the embodiment shown in FIG. 6, the
material yield can be improved as compared with the elastic member 22 A, and the function as
the elastic member is sufficiently achieved even if the component accuracy of each of the elastic
portions 22 c 1 to 22 c 4 is lowered. Can be installed to Therefore, the cost can be reduced. On
the other hand, in the excitation device 20 shown in FIG. 6, another yoke 13 is provided on the
vibrating substrate 21 side. The yoke 13 is formed in a square frame shape, and includes
longitudinal yokes 13a and 13b along the longitudinal current paths 5a1 and 5b1. Therefore, as
shown in a cross-sectional view in FIG. 7, a magnetic circuit is constituted by the excitation
member 3 B including the bent portions 3 e and 3 f, the magnet 6 and the yoke 7, the coil 5 and
the longitudinal yokes 13 a and 13 b There is.
In the gaps G3 and G4 formed between the bent portions 3e and 3f and the magnet 6 and the
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yoke 7, the longitudinal conduction paths 5a1 and 5a2 of the coil 5 and the longitudinal yokes
13a and 13b are inserted. Thus, a magnetic circuit is formed, which passes from the N pole of the
magnet 6 to the yoke 7, the longitudinal conduction path 5 a 1, the longitudinal yoke 13 a, the
excitation member 3 B, and the S pole of the magnet 6. Therefore, the magnetic efficiency of the
magnetic field B3 crossing the vertical direction conduction path 5a1 can be improved. As a
result, it is possible to vibrate the excitation member 3B more strongly, and output with a large
sound pressure becomes possible. Although not illustrated, the magnetic circuit is similarly
configured in the vertical direction current path 5b1, and a magnetic field reverse to the
magnetic field B3 is induced. FIG. 8 shows a method of connecting the coil 5 and the flexible
substrate 11. The coil 5 is formed such that the lead portions 5m and 5n at both ends thereof
extend in the X2 direction along the surface of the vibrating substrate 21. Furthermore, the lead
portions 5m and 5n are formed so as to extend to positions where their front end portions 5m1
and 5n1 face the mounting portion 23b of the frame 23. Then, when the vibrating substrate 21
is fixed to the frame 23 via the elastic member 22 C, the mounting portion 23 b is held in a state
where the tip portions 5 m 1 and 5 n 1 are sandwiched between the vibrating substrate 21 and
the mounting portion 23 b. The front end of the flexible substrate 11 is soldered to and fixed. At
this time, the mounting portion 23b is formed of a conductive member, so that the flexible
substrate and the tip portions 5m1 and 5n1 are electrically connected via the mounting portion
23b. The tips 5m1 and 5n1 may be mounted on the surface of the mounting portion 23b on the
Z2 side, and the tips 5m1 and 5n1 and the flexible substrate 11 may be directly connected. In
the above-mentioned soldering, as shown in FIG. 10, the surface of the mounting portion 23 b
and the mounting surface 23 c are formed in a step-like shape, and the flexible substrate 11 is
fixed to the mounting portion 23 b by the solder 14. At this time, the head 14 a of the solder 14
does not protrude from the mounting surface 23 c of the frame 23. Therefore, in the case where
the mounting surface 23c of the frame 23 is fixed to the exterior of the electronic device or the
like, the mountability is not impaired. Further, since the end portions 5m1 and 5n1 of the lead
portions 5m and 5n are stabilized by the attachment portion 23b, it is possible to prevent
inadvertent contact with other members. FIG. 9 is an exploded perspective view showing another
excitation device that can be mounted on the exterior of the electronic device or the like.
The excitation device 30 has a vibration substrate 31, an excitation member 32A, and vibration
generation means. The vibrating substrate 31 is formed in the shape of a thin plate of opaque
synthetic resin or the like, extends in the X direction with a predetermined width dimension, and
is formed in the shape of a strip. The excitation member 32A has an elongated shape in which
the length in the longitudinal direction (X direction) is longer than the length in the lateral
direction (Y direction). Further, fixing portions 32a and 32b are formed on the excitation member
32A by bending both end portions in the X direction into an L shape. The fixing portions 32 a
and 32 b are fixed to the surface of the vibrating substrate 31 on the Z 2 side via an adhesive or
the like. The vibration generating means is a piezoelectric element 33, which is formed so as to
be bent and deformed in the Z1-Z2 direction when it is energized. The piezoelectric element 33 is
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formed of, for example, an element made of a laminated body, and the width dimension thereof is
formed to be the same as the width dimension of the excitation member 32A, and the length
dimension of the longitudinal direction (X direction) is equal to that of the excitation member
32A. The piezoelectric element 33 is fixed to an intermediate portion of the excitation member
32A so as to be sufficiently shorter than the longitudinal length dimension. In the excitation
device 30 formed as described above, when the piezoelectric element 33 is energized based on
an audio signal or a music signal, the excitation member 32A is vibrated in the Z1-Z2 direction,
and The vibration is transmitted to the vibration substrate 31 via the fixing portions 32a and
32b. The excitation device 30 can be mounted on the exterior parts 100 a, 111 and 121 of
various electronic devices such as the mobile phone 100, the electronic dictionary 110, and the
PDA 120 shown in FIGS. 11 to 13. As shown in FIG. 14, as a method of installing the excitation
device 30 in the exterior part, for example, the excitation device 30 is inserted and mounted in a
hole 111 s formed in the exterior part 111. In this case, a locking portion 111b protruding
inward is formed at the back side edge of the hole 111s, and the Z1 side surface of the locking
portion 111b is provided with the elastic support member 34 on the surface on the Z1 side. Both
ends in the X direction are respectively supported. Further, as shown in FIG. 18, a stepped
portion 111 d is formed at the edge of the front side of the mounting hole 111 t formed in the
exterior portion 111, and the vibrating substrate is viewed from the front side of the exterior
portion 111. The edge of 31 may be fixed with an adhesive or double-sided tape. Further, as
shown in FIG. 19, a stepped portion 111u is formed at the edge of the back side of the mounting
hole 111t of the exterior portion 111, and the vibration substrate 31 is inserted into and fixed to
the stepped portion 111u from the back side of the exterior portion 111. It is also good.
Further, as shown in FIG. 20, the vibration substrate 31 is positioned in the mounting hole 111 t
of the exterior portion 111, and the surface of the vibration substrate 31 and the surface of the
exterior portion 111 are formed of synthetic resin or the like. It may be bonded to each other by
a pressure sensitive adhesive or the like through the sheet member 90. As a result, when the
vibrating substrate 31 is vibrated, the sheet member 90 is bent and deformed to vibrate the
vibrating substrate 31 more largely. Further, as shown in FIG. 21, the vibration substrate 31 is
inserted into the mounting hole 111 t of the exterior portion 111, and the back surface 31 a of
the vibration substrate 31 and the back surface 111 r of the exterior portion 111 are sensed via
the sheet member 90. It may be bonded to each other with a pressure sensitive adhesive. Further,
as shown in FIG. 22, the adjusting portion 111 m is cut out in the direction along the vibration
surface of the vibrating substrate 31 at the inner edge portion of the mounting hole 111 t of the
exterior portion 111 so as to straddle the adjusting portion 111 m. The back surface 31 a of the
vibration substrate 31 and the back surface 111 r of the exterior portion 111 may be joined via
the sheet member 90. In this case, when the vibration substrate 30 is vibrated, the vibration
substrate 31 can be vibrated with a larger amplitude. Thus, the sound pressure output can be
increased. FIG. 23 is a cross-sectional view showing a mounting structure of the excitation device
20. As shown in FIG. However, this excitation device 20 is configured by the vibration substrate
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21, the excitation member 3 B, and the vibration generating means 4. The vibration generating
means 4 is a magnetic circuit composed of the coil 5 and the magnet 6 but may be other
vibration generating means such as a piezoelectric element as described above. In the
configuration shown in FIG. 23, the entire surface of the vibrating substrate 21 is fixed to the
sound producing vibrating body 111 a of the exterior portion 111 with a pressure sensitive
adhesive such as a double-sided tape or an adhesive. Therefore, when the coil 5 is driven based
on the sound signal, the excitation member 3B is vibrated, and the vibration is transmitted to the
vibration substrate 21 through the fixing portions 11a and 11b. Then, the vibration is further
transmitted to the sound-production vibrating body 111a and sounded from the soundproduction vibrating body 111a. FIG. 24 is a cross-sectional view showing another attachment
structure of the excitation device 20, through a joint 70, 70 in which a portion of the vibration
substrate 21 is formed of a pressure sensitive adhesive such as double-sided tape or adhesive. It
is fixed to the sound-production vibrating body 111a of the exterior part 111. The bonding
portions 70 and 70 are provided at positions overlapping the fixing portions 11 a and 11 b in the
Z direction on both sides of the vibrating substrate 21 in the X direction.
In addition, as a fixing method of the vibration board ¦ substrate 21 and the pronunciation
vibration body 111a, it is not limited to a pressure sensitive adhesive, and may be fixed by a
screw member. In this case, when the excitation member 3B is vibrated, the vibrating substrate
21 is vibrated, and the sound producing vibrating body 111a is also vibrated at the same time.
FIG. 25 shows a modification of the mounting structure shown in FIG. 24, and concave notch
grooves 111p and 111p are formed on the surface of the sound-production vibrating body 111a
located on the outside of the joint portions 70 and 70. A thickness dimension h1 of the soundproduction vibrating body 111a in which the notch grooves 111p and 111p are formed is
formed thinner than a thickness dimension H1 of the other sound-production vibrating body
111a. As a result, when the excitation member 3B is vibrated, the sound-production vibrating
body 111a can be easily vibrated. FIGS. 26 to 41 respectively show modifications of the shape of
the excitation member 32 A shown in FIG. By deforming the shape of the excitation member, it
can function as a frequency adjustment unit that changes the frequency of sound generation. The
excitation member 32B shown in FIG. 26 has an elongated shape in which the length dimension
in the longitudinal direction (X direction) is longer than the length dimension in the lateral
direction (Y direction). The excitation member 32B has square shaped fixing portions 32a and
32b at both ends in the X direction. Further, the excitation member 32B has inclined portions
32c and 32d in which both sides of the piezoelectric element as vibration generating means fixed
to the middle portion thereof are bent at a small angle in the Z1 direction. Further, the bending
angles of the fixing portions 32a and 32b are adjusted so as to be parallel to the surface of the
exterior portion. In the excitation member 32 C shown in FIG. 27, bent portions 32 e and 32 f
extending in the X direction are integrally formed on both sides of the piezoelectric element 33.
The bent portions 32e and 32f are formed to be longer in the X1 direction and the X2 direction
than the length dimension in the X direction of the piezoelectric element 33. However, the length
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dimension of the bent portions 32e and 32f in the X direction can be appropriately changed. The
excitation member 32D shown in FIG. 28 is an elongated member extending in the longitudinal
direction similarly to the excitation member 32A shown in FIG. Furthermore, in the excitation
member 32D, notched recesses 32g, 32g, 32h, and 32h are formed facing each other at the edge
portions on the Y1 side and the Y2 side between the piezoelectric element 33 and the fixed
portions 32a and 32b. Thereby, the width dimension of the portion of the notched concave
portions 32g, 32h is formed smaller than the width dimension of the other portions, and the
excitation member 32D is easily bent and deformed.
As a result, the resonance frequency of the excitation member can be reduced, and the
bandwidth of the sound pressure as a whole can be expanded. The notched concave portions 3g
and 3h do not have to be a pair, and may be only one side, and the positions thereof can also be
appropriately changed in the X direction. The excitation member 32E shown in FIG. 29 has
circular through holes 32i and 32j formed between the piezoelectric element 33 and the fixed
portions 32a and 32b. Also in this case, the through holes 32i and 32j are easily bent and
deformed, and the resonance frequency can be lowered. The shape of the through holes 32i and
32j is not limited to a circle, and may be an ellipse, a square, a triangle, or the like. In the
excitation member 32F shown in FIG. 30, bent portions 32k and 32l are formed at both edges in
the Y direction between the fixing portion 32a and the fixing portion 32b. The bent portions 32k,
32l are formed such that the width dimension D1 in the Z direction is formed large at the central
portion, and the width dimensions gradually become smaller from the X direction intermediate
portion toward the X1 side and the X2 side . In this case, unlike the excitation members 32D and
32E shown in FIG. 28 and FIG. The excitation member 32 G shown in FIG. 31 is formed with a
bending portion formed in the same manner as the bending portions 3 c and 3 d of the excitation
member 3 A shown in FIG. Cuts 32m, 32m, 32n, and 32n facing the Z1 side are formed at
positions facing each other in the Y direction between the and the fixing portions 32a and 32b.
The excitation member 32H shown in FIG. 32 is formed with convex portions 32o1 and 32p2
extending in the X direction in the excitation member 32A. Further, on the stepped surface of the
base end of the fixing portions 32a and 32b, convex portions 32o2 and 32p2 which are short in
the Z direction are formed. As a result, in the excitation member 32H, bending deformation does
not easily occur, and a high resonance frequency can be obtained. The excitation member 32I
shown in FIG. 33 is made of a synthetic resin material, and has an elongated shape in which the
length in the longitudinal direction (X direction) is longer than the length in the lateral direction
(Y direction). Further, the excitation member 32I is formed to be thicker in thickness, and a
concave mounting portion 32s formed in a longitudinally elongated middle portion in the
longitudinal direction is formed. In the excitation member 32I, fixing portions 32q and 32r are
formed so as to project at both end portions in the vertical direction, and the fixing portions 32q
and 32r are fixed to the sounding vibrating body 111a of the exterior portion 111 or the like.
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Further, grooves 32q1 and 32r1 extending in the Y direction are formed in the surface on the Z1
side between the fixing portions 32q and 32r and the mounting portion 32s, and the thickness
dimension is formed small. A plate-like piezoelectric element is inserted into and fixed to the
mounting portion 32s. A magnetostrictive vibrator may be used instead of this piezoelectric
element. In the example shown in FIG. 33, since the grooves 32 q 1 and 32 r 1 are formed, the
excitation member 32 I is easily bent and deformed. The excitation member 32I is not limited to
this, and the whole of the excitation member 32I may be a piezoelectric element, and an
electrode may be connected to it to be vibrated. Thereby, the excitation member and the
vibration generating means can be integrated, and the number of parts can be reduced to reduce
the cost. The excitation member 32 J shown in FIG. 34 is formed such that the length dimension
in the longitudinal direction of the excitation member 32 A shown in FIG. 9 is further increased,
and two between the fixed portions 32 a and 32 b and the piezoelectric element 33. It is bent in
the opposite direction to form the overlapping portions 32t and 32s. In this case, the substantial
linear dimension of the excitation member can be increased to lower the resonant frequency of
the excitation member. Further, FIG. 35 is formed to increase the substantial length dimension as
in FIG. In this excitation member 32K, the width dimension is formed narrow between the fixed
portions 32a and 32b and the piezoelectric element 33, and meandering portions 32u and 32v
which are bent twice in the opposite direction along the surface are formed. There is. Also in this
case, it is possible to reduce the resonance frequency of the excitation member. The excitation
member 32 L shown in FIG. 36 has an elongated shape in the longitudinal direction, and has
fixing portions 32 a 1 and 32 b 1 bent in a convex shape toward the Z 1 side slightly closer to
the center than the longitudinal both end portions. . Further, weights 32w and 32x are fixed to
the outside of the fixing portions 32a1 and 32b1, respectively. In the excitation member 32L,
when the fixing portions 32a1 and 32b1 are fixed to the sound generation vibrating body or the
like of the exterior portion and the excitation member 32L is vibrated by the driving force of the
piezoelectric element 33, excitation is performed by the weights 32w and 32x. The member 32L
can be forcibly and largely vibrated. Therefore, the sound pressure output can be further
increased. In the above description, a magnetostrictive vibrator may be mounted instead of the
piezoelectric element as the vibration generating means. FIGS. 37 to 39 show modifications of
the excitation member 3 B shown in FIG.
However, this modification may be applied to the excitation member 3A. The excitation member
3C shown in FIG. 37 has an elongated shape in which the length dimension in the vertical
direction (X direction) is longer than the length dimension in the horizontal direction (Y
direction), and the middle in the vertical direction (X direction) A pair of cut and raised portions
3c1 and 3c2 are formed in the portion. The vertical dimension D4 of the cut and raised portions
3c1 and 3c2 is set to a dimension in which the magnet 6 can be inserted. By thus forming not
only the bent portions 3e and 3f but also the cut-and-raised portions 3c1 and 3c2, the magnetic
efficiency can be improved. The excitation member 3D shown in FIG. 38 has an elongated shape
that is long in the longitudinal direction (X direction), and the bent portions 3e1 and 3f1 are
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formed at the edge portions on the Y1 side and the Y2 side, respectively. The bent portions 3e1
and 3f1 are formed shorter than the longitudinal dimension of the excitation member, and bent
pieces 3g1 and 3g2 are formed at both ends of the bent portion 3e1, and are bent vertically to
the Y2 side, Similarly, bending pieces 3h1 and 3h2 are formed at both end portions of the
bending portion 3f1 and are bent perpendicularly to the Y1 side, respectively. Thus, the bent
portions 3e1 and 3f1 and the bent pieces 3g1 and 3g2 and 3h1 and 3h2 are formed in a frame
shape. In the excitation member 3E shown in FIG. 39, bending pieces 3i and 3j are formed in
parts of the bending portions 3e and 3f of the excitation member 3B, and the bending pieces 3i
are perpendicular to the Y2 side. The bent pieces 3j are respectively bent perpendicularly to the
Y1 side, and are formed in a frame shape by the bent portions 3e and 3f and the bent pieces 3i
and 3j. Also in this case, the magnet 6 is fixed in the frame in the same manner as described
above, so that the magnetic efficiency in the magnetic circuit can be increased. FIGS. 40 to 44
show a method of fixing the excitation member 32 A to the vibration substrates 21 and 31 or the
sound generation vibration body 111 a and the like. In FIG. 40, circular through holes 32a3 and
32b3 are formed in the fixing portions 32a and 32b of the excitation member 32A. After
positioning the excitation member 32A formed in this manner on the vibration substrates 21 and
31 and the sound generation vibration body 111a, the adhesives 50 and 50 are applied to the
through holes 32a3 and 32b3. At this time, as shown in FIG. 41, the adhesives 50 and 50 spread
around the through holes 32a3 and 32b3 to prevent the excitation member 32A from easily
coming off from the vibration substrate or the like. Thus, the bonding force between the
excitation member 32A and the vibration substrates 21 and 31 can be improved. Further, in the
configuration shown in FIG. 42, semicircular notches 32a4 and 32b4 are formed at the edge
portions of the fixing portions 32a and 32b facing the X1, X2, Y1 and Y2 sides, respectively.
Also in this case, when the adhesive is applied in the same manner as described above, the
retaining effect is exhibited. FIG. 43 shows a combination of FIG. 40 and FIG. 42, in which
circular through holes 32a5 and 32b5 are formed at the centers of the fixing portions 32a and
32b and a plurality of semicircular notches 32a6 and 32b6 are formed around the periphery. It
is done. As a result, the area with the adhesion surface of the excitation member 32A is
increased, the adhesion is increased, and the retaining effect can be further improved. FIG. 44
shows a cross-sectional structure in the case where the excitation member 32A is directly
attached to the sound-production vibrating body 111a of the exterior part 111 of the electronic
device. As shown in FIG. 44, the piezoelectric element 33 is fixed to the central portion in the
longitudinal direction of the excitation member 32A. A concave installation portion 115
elongated in the X direction is formed on the surface of the sound production vibrating body
111a, and the fixing portions 32a and 32b of the excitation member 32A are fixed to the bottom
surface 115a of the installation portion 115. As a result, the vibration of the excitation member
32A is transmitted to the sound-production vibrating body 111a and sounded from the soundproduction vibrating body 111a. At this time, it also becomes possible to cause the excitation
member 32A to produce sound. In addition, when the concave installation portion 115 is formed,
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since the thickness dimension D6 of the sound generation vibration body 111a can be formed
thin, the sound generation vibration body 111a can be more easily vibrated. FIG. 45 shows a
cross-sectional view when the excitation device 30 shown in FIG. 9 is provided in the concave
installation portion 115. As shown in FIG. As shown in FIG. 45, the excitation member 32A is
fixed to the vibration substrate 31, and the whole or a part of the vibration substrate 31 is fixed
to the bottom surface 115a of the installation portion 115. Therefore, also in this case, the
vibration of the excitation member 32A is transmitted to the sound-production vibrating body
111a via the vibration substrate 31, and the sound-production vibrating body 111a generates
sound. As shown in FIG. 46, in the excitation member 10 shown in FIGS. 1 and 3, an opaque
shielding sheet 40 such as black is fixed by an adhesive or the like around the transparent
substrate 2 (portion shown by oblique lines). ing. Thereby, in the case of a display device in
which the display panel 101 is installed on the back side of the transparent substrate 2, the
vibration generating means 4 and the elastic member 8 can be made invisible to the user. In the
excitation apparatus shown in FIGS. 1 and 3, the member vibrated by the excitation member has
been described as a transparent substrate, but it is a non-transparent vibration substrate and is
mounted on the exterior of an electronic device. It may be In addition, as an example of mounting
the above-described excitation device 10 in an electronic device, the present invention can be
applied not only to mobile phones, but also to surfaces of display panels mounted on digital still
cameras, video cameras, and electronic dictionaries.
In addition, as an example of mounting the above-described excitation device 20 in an electronic
device, it can be incorporated in part of the periphery of the display panel of a digital still camera
or video camera. Further, examples of mounting the excitation devices 20 and 30 on electronic
devices include portable audio devices such as MD, CD, DVD, and television, household use such
as personal computer, microwave oven, washing machine, refrigerator, etc. It can be mounted on
the exterior of an electrical product. As described above, the present invention can be easily
installed in various electronic devices, and can generate sound with an output of a predetermined
level or more. Further, even if mounted on a small electronic device, miniaturization is not lost.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an
example of an excitation device that can be mounted on the surface of a display panel, FIG. 2 is a
cross-sectional view taken along line 2-2 of FIG. FIG. 4 is an exploded perspective view showing
an example of an excitation device that can be mounted on an exterior part of an electronic
device, etc. FIG. 5 is a modification of the excitation device shown in FIG. Fig. 6 is an exploded
perspective view showing an example, Fig. 6 is an exploded perspective view showing a modified
example of the vibration generating means, Fig. 7 is a sectional view cut along line 7-7 in Fig. 6,
Fig. 8 connection between a coil and a substrate FIG. 9 is a perspective view showing a method,
FIG. 9 is an exploded perspective view showing another excitation device that can be mounted on
an exterior part of an electronic device, etc. FIG. 10 is a cross sectional view showing how to
attach a frame and a substrate. FIG. 12 is a perspective view showing an example of mounting of
a display device in an electronic device, and FIG. 12 is a perspective view showing an example of
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mounting of an excitation device in an electronic device 13 is a perspective view showing
another mounting example of the excitation device in the electronic device, FIG. 14 is a partially
enlarged sectional view showing an example of incorporating the excitation device into the
exterior part, and FIG. 15 is the exterior part of the excitation device FIG. 16 is a partially
enlarged cross-sectional view showing another example of incorporation into the exterior, FIG.
16 is a partially enlarged cross-sectional view showing another example of incorporating the
excitation device into the exterior, FIG. 18 is a partially enlarged sectional view showing another
example of incorporation, FIG. 18 is a partially enlarged sectional view showing another example
of incorporating the excitation device into the exterior part, and FIG. 19 is another example to the
exterior part of the excitation device FIG. 20 is a partially enlarged sectional view showing an
example of incorporation, FIG. 20 is a partially enlarged sectional view showing another example
of incorporating the excitation device into the exterior part, and FIG. 21 is another incorporation
of the excitation device into the exterior part 22 is a partially enlarged sectional view showing an
example, FIG. 22 is a partially enlarged sectional view showing another incorporating example of
the excitation device to the exterior part, and FIG. 23 is another incorporating example of the
excitation device to the exterior part Indication FIG. 24 is a cross-sectional view showing another
example of incorporating the excitation device into the exterior part, FIG. 25 is a cross-sectional
view showing another example of incorporating the excitation device into the exterior part, FIG.
FIG. 27 is a perspective view showing another modification of the excitation member shown in
FIG. 9, FIG. 27 is a perspective view showing another modification of the excitation member, FIG.
28 is a perspective view showing another modification of the excitation member, FIG. FIG. 30 is a
perspective view showing another modification of the excitation member, FIG. 30 is a perspective
view showing another modification of the excitation member, FIG. 31 is a perspective view
showing another modification of the excitation member, and FIG. Fig. 33 is a perspective view
showing another modified example of the excitation member, Fig. 34 is a perspective view
showing another modified example of the excitation member, Fig. 35 other than the excitation
member FIG. 36 is a perspective view showing another modification of the excitation member,
FIG. 37 is a perspective view showing another modification of the excitation member, FIG. 8 is a
perspective view showing another modification of the excitation member, FIG. 39 is a perspective
view showing another modification of the excitation member, and FIG. 40 is a perspective view
showing a modification of the fixed portion provided on the excitation member. 41 is a plan view
showing a state in which the fixing portion is adhesively fixed, FIG. 42 is a perspective view
showing another modification of the fixing portion, and FIG. 43 is a perspective view showing
another modification of the fixing portion Fig. 44 is a cross-sectional view showing the entire
attachment structure of the excitation device, Fig. 45 a cross-sectional view showing the entire
attachment structure of the excitation device, Fig. 46 a plan view showing a state in which a
shielding sheet is provided on a transparent substrate. [Description of mark] 2 Transparent
substrates 3A to 3E Excitation members 3a and 3b Fixing portions 3c, 3d, 3e and 3f Bending
portion 4 Vibration generating means 5 Coil 5a1 and 5a2 Longitudinal current passage 5b1 and
5b2 Lateral current passage 5m, 5n lead part 5m1, 5n1 tip part 6 magn 6a, 6b Side surface 7, 13
Yoke 8, 22A to 22C Elastic member 9, 23 Frame 9b, 23b Mounting portion 10, 20, 30 Excitation
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device 11 Flexible substrate 11a, 11b, 32a, 32b Fixing portion 21, 31 Vibration substrate 32A ˜
32L Excitation member 33 Piezoelectric element 40 Shielding sheet 100a, 111, 121 Exterior
portion 100b Display window 101, 122 Display panel
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