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JP2003122482

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DESCRIPTION JP2003122482
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
panel switch used in various electronic devices such as PDA (Personal Digital Assistants) and an
electronic device using the same.
[0002]
2. Description of the Related Art In recent years, electronic devices such as PDAs and mobile
phones are equipped with many easy-to-operate panel switches with which users can select
menus by pressing the surface with a finger or pen as an input device. A speaker for playing
music etc. is built in.
[0003]
A portable telephone as an example of such a conventional electronic device will be described
with reference to FIG.
[0004]
FIG. 9 (a) is a plan view of a conventional portable telephone, and FIG. 9 (b) is a sectional view
thereof, in which 20 is a panel switch, 21 is a voice receiving speaker, 22 is a music reproduction
speaker, and 23 is a housing The body 24 is a display element.
[0005]
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20A of the panel switch 20 is an upper substrate such as a polyester terephthalate (PET) film, for
example, and is formed by coating the upper electrode 20B on the lower surface.
20C is a lower substrate such as glass, for example, on which the lower electrode 20D is formed
on the upper surface.
20E is a spacer for adhering the upper substrate 20A and the lower substrate 20C, and 20F is a
closed gap formed by the upper substrate 20A, the lower substrate 20C and the spacer 20E.
[0006]
The operation of the mobile phone with the above configuration will be briefly described.
[0007]
For example, when playing back music, pressing the music playback key of the operation menu
displayed on the display element 24 with a finger or the like from the surface of the panel switch
20 causes the upper substrate 20A to bend and the upper electrode 20B and the lower electrode
20D to conduct. The input signal is read by an input signal processing means (not shown), it is
recognized that music reproduction is selected, and a music reproduction speaker 22 can be
driven by an acoustic drive means (not shown) to reproduce music. .
[0008]
Also, for example, when reproducing an audio signal received from an antenna (not shown), the
audio signal is read by a reception signal processing means (not shown) and the speaker 21 for
audio reception is read by an acoustic drive means (not shown). It can be driven to play back
audio.
[0009]
The above-mentioned conventional portable telephones are widely used as portable information
terminals, and there is a strong demand for an increase in size of the panel switch 20 because of
the ease of operation.
[0010]
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SUMMARY OF THE INVENTION An object of the present invention is to provide a panel switch
that combines an input function and a speaker function to increase the size of an operation area
and an electronic device using the panel switch.
[0011]
[Means for Solving the Problems] In order to achieve the above object, the present invention has
the following constitution.
[0012]
The invention according to claim 1 of the present invention is formed between the upper
substrate on which the upper electrode is formed, the lower substrate opposed to the upper
electrode and the lower electrode on which the lower electrode is formed, and the upper
substrate and the lower substrate. The panel switch is composed of the closed gap and the
transmission means for transmitting the vibration from the outside to the closed gap, and it is
possible to reproduce the sound and the vibration from the panel switch such as a touch panel or
a membrane switch. However, since the operation area can be enlarged by integrating (no need
for a conventional separate speaker), it is possible to cope with the increase of the operation
menu and to improve the usability.
[0013]
The invention according to claim 2 is that in the invention according to claim 1, the transmission
means is a hollow tube connecting the closed gap formed between the upper substrate and the
lower substrate and the outside, Can be transmitted through the hollow tube, for example, the
external vibration can be transmitted from the back of the display element, and the operation
area of the panel switch can be widened and the display area of the display element can be
widened. Have.
[0014]
The invention according to claim 3 is that, in the invention according to claim 1, a plurality of
transmission means for transmitting external vibration to the closed gap are formed, and external
vibration is provided for each transmission means. And stereo reproduction can be enabled.
[0015]
According to a fourth aspect of the present invention, in the first aspect, the outer peripheries of
the upper substrate and the lower substrate are fixed by a spacer, and the transmission means is
formed on the spacer. In addition to being able to do, it has the effect that the display area of the
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display element can also be made wide.
[0016]
The invention according to a fifth aspect is the invention according to the first aspect, wherein
the vibration means is formed in the vicinity of the closed gap of the lower substrate, and for
example, the vibration means is embedded in the lower substrate or spacer of the panel switch.
This has the effect of making it possible to reduce the thickness of the electronic device on which
the switch is mounted.
[0017]
The invention according to a sixth aspect is the invention according to the first aspect, wherein a
thin film is provided between the transmission means and the closed space, and has the effect of
preventing foreign matter entry such as dust and dirt in the closed space. .
[0018]
The invention according to claim 7 comprises the panel switch according to claim 1, vibration
means connected to the transmission means of the panel switch, and control means connected to
the panel switch and the vibration means, the control The means comprises at least an input
signal processing means for electrically processing an input signal from the panel switch, and an
acoustic driving means for acoustically driving the vibration means, for example, according to the
present invention on the front surface of the display element. In the case of the electronic device
in which the panel switch is arranged, the operation area of the panel switch can be widened
because the speaker is integrated, and the sound emission surface is the same as the display
element surface. It has the effect of enabling more realistic sound reproduction.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to FIGS.
[0020]
(First Embodiment) The first embodiment of the present invention will be used to explain the
inventions of claims 1 and 7 of the present invention.
[0021]
FIG. 1 shows a mobile phone as an electronic apparatus equipped with the panel switch
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according to the first embodiment of the present invention, FIG. 1 (a) is a plan view, FIG. 1 (b) is a
sectional view taken along the line A-B, In the figure, 1 is a panel switch according to the present
invention, 2 is an acoustic hole as a transmission means provided in the panel switch 1 for
transmitting external vibration, 3 is a housing, 4 is a display element, 5 is attached to the panel
switch 1 Electromechanical acoustic transducer as external vibration, 6 an input signal
processing means for electrically processing at least an input signal from the panel switch 1, and
an acoustic driving means for acoustically driving the electromechanical acoustic transducer 5
And 7 is an operation menu displayed on the screen of the display device 4.
[0022]
Further, in the figure, 1A of the panel switch 1 is an upper substrate of a film such as transparent
PET (polyethylene terephthalate) or transparent PC (polycarbonate) generally formed on the
lower surface of the upper electrode 1B.
A lower electrode 1D is formed on the upper surface of the lower electrode 1C, and the lower
electrode 1D is generally a lower substrate such as a transparent glass, a transparent plastic, a
transparent PET or a transparent PC film.
[0023]
In the case of a transparent panel switch disposed on the front surface of the display element 4
as the panel switch 1, the upper electrode 1B and the lower electrode 1D are generally made of
ITO (indium tin oxide) or SnO2 (tin oxide) as a transparent electrode. Be
[0024]
When not disposed on the front surface of the display element 4 and transparency is not
required, a conductive material such as carbon is also widely used as an electrode.
[0025]
Reference numeral 1E denotes a microdot spacer, which supports the upper substrate 1A so that
the upper substrate 1A is deformed and the upper electrode 1B and the lower electrode 1D are
not conductive except at the point where the upper substrate 1A is pressed. For example, a base
resin is used.
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[0026]
Wiring electrode 1F is printed under the upper electrode 1B to detect the position of the panel
switch 1 in the Y-axis direction. 1G is printed on the lower electrode 1D to detect the position of
the panel switch 1 in the X-axis direction. Wiring electrodes.
An adhesive 1H adheres to the upper substrate 1A and the lower substrate 1C and is applied
with a predetermined width along the outer periphery of the panel switch 1, and generally an
acrylic resin or the like is used.
[0027]
Reference numeral 1I is an insulating material for preventing conduction between the wiring
electrodes 1F and 1G and the upper and lower electrodes 1B and 1D in contact with each other,
and has a predetermined width along the outer periphery of the panel switch 1 like the adhesive
1H. It is applied and generally an epoxy resin is used.
[0028]
The adhesive material 1H and the insulating material 1I function as a spacer for securing an
appropriate closed gap 1J between the upper substrate 1A and the lower substrate 1C, and are
uniformly applied along the outer periphery of the panel switch 1 Therefore, the closed gap 1J is
sealed.
[0029]
An acoustic hole 2 as a transmission means for transmitting vibration from the outside
penetrates the lower electrode 1 D and the lower substrate 1 C and is joined to the
electromechanical acoustic transducer 5.
[0030]
Further, FIG. 2 shows a cross-sectional view of an electrodynamic speaker using a driving force of
a voice coil provided in a magnetically closed gap of a magnetic circuit as an example of the
electromechanical acoustic transducer 5.
[0031]
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In the figure, 10 is a bowl-shaped yoke, 11 is a magnet provided at the center of yoke 10, 12 is a
plate disposed on the upper surface of magnet 11, 13 is an inner circumferential surface of yoke
10 and the outer circumferential surface of plate 12. The closed magnetic gap 14 is a voice coil
inserted in the closed magnetic gap 13.
A diaphragm 15 has a voice coil 14 joined at its central portion and an outer peripheral portion
fixed to a frame 16. The diaphragm 15 is attached to the acoustic hole 2.
[0032]
The operation of the mobile phone configured as described above will be described.
[0033]
As an example, in the case of music reproduction in FIG. 1, when the operation menu 7 is pressed
from the surface of the panel switch 1, the control means 6 recognizes that there is a request for
music reproduction, and the magnetically closed gap of the electromechanical acoustic
transducer 5 An electric signal is applied to the voice coil 14 inserted in 13, a driving force is
generated in the voice coil 14, and the diaphragm 15 coupled thereto is vibrated to generate a
sound, and the sound radiated from the diaphragm 15 is generated. Can be transmitted to the
closed gap 1J through the acoustic hole 2, and the upper substrate 1A can be acoustically driven
by the sound pressure of the closed gap 1J to vibrate and perform music reproduction.
[0034]
FIG. 3 shows measurement results of sound pressure frequency characteristics of the upper
substrate 1A of L90 mm × W 60 mm and a thickness of 0.1 mm using an electrodynamic
speaker with an aperture of 18 mm as the electromechanical acoustic transducer 5.
As the measurement conditions, a microphone is installed at a position 0.1 m away from the
front surface of the panel switch 1, and an electric input of 0.1 W is applied.
[0035]
In the same figure, the characteristic in the case where the upper substrate 1A is removed and
the electrodynamic speaker with a diameter of 18 mm is measured alone is shown in II, the
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characteristic in the state where the upper substrate 1A is attached is shown in I, the state where
the upper substrate 1A is attached In Property I, the sound pressure level decreases in the high
frequency range from 4 KHz to 5 KHz, which is determined by the acoustic volume of the closed
gap 1J and the weight of the upper substrate 1A, ie, the upper substrate By sandwiching the
closed gap 1J between 1A and the lower substrate 1C, it is possible to increase the frequency at
which the sound volume is reduced and the sound pressure level in the high range is decreased,
and the weight of the upper substrate 1A is lightened. If this is done, the sound pressure range of
the high range is expanded, and it is possible to control the high range characteristic by selecting
the material of the upper substrate 1A with a small thickness and specific gravity.
[0036]
In the present embodiment, the electrodynamic loudspeaker having a diameter of 18 mm used as
the electromechanical acoustic transducer 5 is such that the diaphragm 15 is a 20 μm PEN
(polyethylene naphthalate) material, and its weight is about 6 mg. The voice coil 14 used is a
copper wire having a diameter of 8 mm and a wire diameter of 0.055 mm, and its weight is 25
mg.
[0037]
On the other hand, the weight of the upper substrate 1A having a size of L90 mm × W60 mm
and a thickness of 0.1 mm is about 700 mg, and the total weight ratio of the upper substrate 1A
to the diaphragm 15 and the voice coil 14 is 700 mg / (6 mg + 25 mg) = 22 .6 times.
[0038]
The vibration area of the upper substrate 1A of the present embodiment and the effective
vibration area of the diaphragm 15 (having an effective radius up to about the center of the edge
portion forming the diaphragm 15 in this embodiment) However, when the area ratio with the
effective radius is 5.6 mm is 5400 mm 2 / 98.5 mm 2 = 54.5 times, the target viewed from the
diaphragm 15 of the electromechanical acoustic transducer 5 to be vibrated, That is, the
equivalent weight of the upper substrate 1A is a square of the area ratio by the effect of the
acoustic converter, that is, 700 mg / 54.52 = 1.4 mg, and the book drives the upper substrate 1A
through the closed gap 1J. According to the method of the embodiment, the upper substrate 1A
of the panel switch 1 can be used as a diaphragm for sound reproduction without causing a
decrease in the sound pressure level.
[0039]
As described above, according to the present embodiment, a transfer means (acoustic system for
transmitting external vibration to the closed gap 1J formed between the upper substrate 1A, the
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lower substrate 1C, and the upper substrate 1A and the lower substrate 1C) The panel switch is
configured by providing the hole 2), and since sound and vibration can be reproduced from the
front face of the operation input such as a touch panel or a membrane switch, the speaker can be
integrated to increase the size of the panel switch. It is possible to increase the number of
operation menus and obtain an easy-to-use electronic device.
[0040]
Further, in the case of the electronic device using the panel switch of the present embodiment,
the operation area of the panel switch can be expanded by the amount of integration of the
speaker with the panel switch, and the sound radiation surface is the same as the display
element. Thus, it is possible to obtain an electronic device capable of more realistic sound
reproduction by matching the image position and the sound position.
[0041]
In the present embodiment, a mobile phone has been described as an electronic device equipped
with a panel switch, but it can be widely used for an electronic device equipped with a signal
processing circuit for images and sounds. The present invention is applicable to car navigation
systems, game machines, personal computers, televisions, and other home appliances and office
equipment having panel switches.
[0042]
In order to prevent the sound radiated from the electromechanical acoustic transducer 5 from
leaking, it is desirable that the closed gap 1J be configured to maintain high air tightness.
[0043]
Further, in the present embodiment, the electro-mechanical acoustic transducer 5 has been
described using an electrodynamic system, but any electro-acoustic transducer may be used as
long as it has a function of emitting a sound from a diaphragm. The same action can be obtained
by an electromagnetic type using a plate, a piezoelectric type using a piezoelectric material as a
vibrating plate, or an electrostatic type using static electricity.
[0044]
Furthermore, in the panel switch of this embodiment, the upper and lower substrates and the
upper and lower electrodes may not be visible when it is not necessary to be disposed on the
front surface of the display element. Make it possible.
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[0045]
Although the upper and lower substrates 1A and 1C have been described as a single layer as the
configuration of the panel switch, a plurality of upper and lower substrates may be provided to
improve the operation durability of the panel switch.
[0046]
As an example, as shown in the cross-sectional view of FIG. 4, the upper substrate 1A is formed
by bonding thin films 1K such as PET and PC, the upper electrode 1B is formed on the thin film
1K, and the lower substrate 1C is The same action is obtained even in a configuration in which a
thin film film 1M such as PET or PC having the electrode 1D formed on the upper surface and
the acoustic hole 2 provided is laminated to a thin plate such as glass or plastic or a film such as
PET or PC. can get.
[0047]
In the present embodiment, the closed gap 1J between the upper substrate 1A and the lower
substrate 1C is described as an air layer, but when the panel switch is considered as a
transparent touch panel, silicone oil or fluorine oil is enclosed in the closed gap 1J, Although
there is also an attempt to improve the transmittance and the optical characteristics, it is possible
to reproduce the sound even with this configuration, and it is possible to realize the object of the
present invention.
[0048]
Second Embodiment The second embodiment of the present invention will be used to explain the
inventions described in the fourth to the fourth aspects of the present invention.
[0049]
The same reference numerals are given to parts having the same configuration as the
configuration of the first embodiment to simplify the detailed description.
[0050]
FIG. 5 (a) is a plan view of the electronic device on which the panel switch according to the
second embodiment of the present invention is mounted, FIG. 5 (b) is a sectional view taken
along the line C-D, FIG. It is.
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[0051]
In the figure, 5A and 5B are electromechanical acoustic transducers attached in plurality under
the panel switch 1, 8A penetrates the lower electrode 1D of the panel switch 1 and lower
substrate 1C, and the electromechanical acoustic transducer 5A and the middle. It is an acoustic
hole connected via the acoustic pipe 9A which is an empty pipe.
Similarly, 8B is an acoustic hole which penetrates the lower electrode 1D and the lower substrate
1C of the panel switch 1 and is connected to the electromechanical acoustic transducer 5B via
the acoustic tube 9B which is a hollow tube, and the acoustic holes 8A and 8B are The adhesive
material 1H and the insulating material 1I which are applied with a predetermined width along
the outer periphery of the upper and lower substrates 1A and 1C and also function as a spacer
for securing an appropriate closed gap 1J between the upper and lower substrates 1A and 1C It
is configured to be connected to the closed gap 1J.
[0052]
Although the adhesive 1H and the insulating material 1I also function as a spacer for securing
the closed gap 1J, originally, as described in the first embodiment, the adhesive 1H is in the Yaxis direction. The wiring electrode 1F for performing position detection and the lower electrode
1D are for preventing conduction through contact with the lower electrode 1D, and the insulating
material 11 has the wiring electrode 1G for performing position detection in the X-axis direction
on the upper side. It is for preventing contact and conduction with the electrode 1 B, and
therefore, it can not be used as an operation area of the panel switch 1.
[0053]
The acoustic tube 9A and the acoustic hole 8A connect the closed gap 1J and the
electromechanical acoustic transducer 5A. Similarly, the acoustic tube 9B and the acoustic hole
8B communicate with the closed gap 1J of the panel switch 1 and electromechanical acoustic
conversion. The acoustic holes 8A and 8B are provided at the corners of the panel switch 1 to
connect the container 5B.
[0054]
The operation of the above configuration will be described.
[0055]
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When an electrical signal is applied to electromechanical acoustic transducer 5A, the sound
radiated from electromechanical acoustic transducer 5A is transmitted to closed air gap 1J
through acoustic tube 9A and acoustic hole 8A, and upper substrate 1A is a closed air gap. It is
acoustically driven at a sound pressure of 1 J to vibrate, and sound can be reproduced by this
vibration.
Similarly, when an electrical signal is applied to electromechanical acoustic transducer 5B, the
sound emitted from electromechanical acoustic transducer 5B is transmitted to closed air gap 1J
through acoustic tube 9B and acoustic hole 8B, and the upper substrate It becomes possible to
perform music reproduction by the acoustic vibration of 1A.
[0056]
The difference from the first embodiment is that a plurality of electromechanical acoustic
transducers 5A, 5B are attached, and the closed gap 1J between the electromechanical acoustic
transducers 5A, 5B and the upper and lower substrates of the panel switch 1 is An acoustic hole
which is a structure connected by the acoustic tubes 9A and 9B and further transmits the sound
radiated from the electromechanical acoustic transducers 5A and 5B to the closed gap 1J
between the upper and lower substrates 1A and 1C of the panel switch 1 8A and 8B are provided
at the corners of the adhesive material 1H and the insulating material 1I which are portions that
can not be used as the operation area of the panel switch 1.
[0057]
As described above, according to the present embodiment, the transmission means is a hollow
tube (acoustic tube 9A, 9B) connecting the closed gap 1J formed between the upper substrate 1A
and the lower substrate 1C and the outside. Since vibrations from the outside can be transmitted
through the hollow tube, for example, vibrations from the outside can be transmitted from the
back of the display element 4, and the operation area of the panel switch can be widened and the
display area of the display can be widened. It is.
[0058]
Further, by forming a plurality of transmission means for transmitting external vibration to the
closed gap 1J, it is possible to provide external vibration for each transmission means to increase
the magnitude of sound and vibration, and also possible to perform stereo reproduction and the
like. become.
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[0059]
Furthermore, by providing the acoustic holes 8A and 8B in the adhesive material 1H and the
insulating material 1I which can not be used as the operation area of the panel switch 1, a panel
switch having a larger operation area can be provided.
[0060]
Third Preferred Embodiment The third preferred embodiment according to the present invention
will be described with reference to the third preferred embodiment.
[0061]
The same components as those in the first and second embodiments will be assigned the same
reference numerals to simplify the detailed description.
[0062]
FIG. 7 (a) is a plan view of an electronic device on which the panel switch according to the third
embodiment of the present invention is mounted, and FIG. 7 (b) is a sectional view taken along
the line E-F. A plurality of electromechanical acoustic transducers incorporated in the lower
substrate 1C on which the lower electrode 1D of the panel switch 1 is formed, and 8A and 8B are
acoustic holes provided in the adhesive material 1H and the insulating material 1I which are
spacer portions. .
[0063]
The operation of the above configuration will be described.
[0064]
When an electrical signal is applied to the electromechanical acoustic transducer 5C, the sound
emitted from the electromechanical acoustic transducer 5C is transmitted to the closed air gap 1J
through the acoustic hole 8A, and as a result, the upper substrate 1A of the panel switch 1 is It is
acoustically driven and vibrated by the sound pressure of the closed gap 1J, and acoustic
reproduction can be performed by this vibration.
[0065]
Similarly, when an electrical signal is applied to the electromechanical acoustic transducer 5D,
the sound emitted from the electromechanical acoustic transducer 5D is transmitted to the closed
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air gap 1J through the acoustic hole 8B, and acoustically of the upper substrate 1A. The vibration
makes it possible to play music.
[0066]
The difference from the second embodiment is that since the electromechanical acoustic
transducers 5C and 5D are integrally incorporated in the lower substrate 1C, the panel switch 1
with no protrusion whose back is flat is realized. In combination with other components, for
example, the display element 4, the size and arrangement of the display element 4 are not
restricted, and the display element 4 can be made larger. The degree of freedom can be given to
the structural arrangement of the electronic device having the electromechanical acoustic
transducers 5C and 5D, and the thinning of the electronic device can be facilitated.
[0067]
As described above, according to the present embodiment, the vibration means
(electromechanical acoustic transducers 5C, 5D) are formed in the vicinity of the closed gap 1J,
and the vibration means is embedded in the lower substrate 1C of the panel switch 1, for
example. (1) It is possible to reduce the thickness and weight of electronic devices equipped with
the electronic device.
[0068]
(Fourth Embodiment) The fourth embodiment of the present invention will be used to explain the
invention according to the sixth aspect of the present invention.
[0069]
In addition, the same code | symbol is attached | subjected to the part of the structure same as
the structure of Embodiment 1-3, and detailed description is simplified.
[0070]
FIG. 8 is a cross-sectional view of an essential part of an electronic device according to a fourth
embodiment of the present invention. In FIG. 8, reference numeral 17 denotes a mesh for
preventing foreign matter such as dust from entering the closed space 1J. It is a thin film having
air permeability such as non-woven fabric, and by being provided between the acoustic hole 2 of
the lower substrate 1 C and the electromechanical acoustic transducer 5, the sound radiated
from the diaphragm 15 is closed via the acoustic hole 2. The upper substrate 1A is acoustically
driven and vibrated by the sound pressure of the closed gap 1J, and the vibration can be
reproduced by this vibration, and foreign substances such as dust can intrude into the closed gap
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1J. It can prevent.
[0071]
As described above, according to the present embodiment, since foreign matter does not enter
the closed gap 1J, malfunction due to foreign matter is eliminated during conduction between the
upper and lower electrodes 1B and 1D. In the case of a panel switch or the like, sound
reproduction can be realized without losing the quality of the appearance.
[0072]
In the present embodiment, the thin film 17 is a breathable film, but it is sufficient that the thin
film 17 has the characteristic of vibrating to transmit the vibration of the sound radiated from
the diaphragm 15 of the electromechanical acoustic transducer 5, It does not have to be limited
to one having breathability.
[0073]
As described above, according to the present invention, it is possible to obtain an advantageous
effect that it is possible to obtain a panel switch corresponding to an increase in operation menu
and an electronic device using the same.
[0074]
Brief description of the drawings
[0075]
FIG. 1 (a) is a plan view of an electronic device on which the panel switch according to the first
embodiment of the present invention is mounted.
[0076]
Fig. 2 Cross section of the same electromechanical acoustic transducer
[0077]
Figure 3 shows the same sound pressure frequency characteristics
[0078]
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15
4 is a cross-sectional view of an electronic device on which the panel switch according to the
other embodiment is mounted.
[0079]
FIG. 5 (a) is a plan view of an electronic device on which the panel switch according to the second
embodiment of the present invention is mounted.
[0080]
Figure 6 the same main part perspective view
[0081]
FIG. 7A is a plan view of an electronic device on which the panel switch according to the third
embodiment of the present invention is mounted.
[0082]
FIG. 8 is a sectional view of an essential part of a panel switch according to a fourth embodiment
of the present invention.
[0083]
FIG. 9 (a) is a plan view of a conventional portable telephone
[0084]
Explanation of sign
[0085]
DESCRIPTION OF SYMBOLS 1 Panel switch 1A Upper substrate 1B Upper electrode 1C Lower
substrate 1D Lower electrode 1E Micro dot spacer 1F Wiring electrode 1G Wiring electrode 1H
Adhesive material 1I Insulating material 1J Closed gap 2, 8A, 8B Acoustic hole 3 Case of
electronic equipment 4 Display element 5, 5A, 5B, 5C, 5D electromechanical acoustic converter 6
control means 7 operation menu
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