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JP2007082009

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DESCRIPTION JP2007082009
PROBLEM TO BE SOLVED: To efficiently transmit vibration of a panel to the surroundings.
SOLUTION: The thickness of a panel to be attached to a piezoelectric element of a panel speaker
is thick in the vicinity of the attachment of the vibration element and the panel, and the thickness
is reduced from the attaching part toward the periphery. Vibration can be uniformly transmitted
to the entire panel, and the entire panel can be uniformly vibrated. [Selected figure] Figure 3
パネルスピーカ
[0001]
The present invention relates to a panel speaker, and more particularly to a panel speaker having
efficient vibration transmission of the panel.
[0002]
The market for mobile terminal devices in recent years in Japan has reached maturity, and
manufacturers of mobile terminal devices are striving to gain advantages over other companies
by bringing high value-added products to the market.
The added value of the product is, for example, the feature of the design, the loading of Felica (to
be carried by the wallet), the loading of a hinge of two axes, music delivery, etc. Among them,
there is a model equipped with a flat panel speaker having a speaker and a receiver function by
vibrating the entire panel of the display unit.
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[0003]
A known flat panel speaker 40 (hereinafter referred to as a known flat panel speaker) mounted
on a mobile phone includes a front case 42 and a panel 44 attached to the front case 42, as
shown in FIGS. 10 to 13. A vibrating element (piezoelectric element) (DMA (Distributed Mode
Actuator)) 46 affixed (fixed) to the panel 44 and a gasket 48 sandwiched between the front case
42 and the panel 44 for attaching the panel 44 to the front case 42 And are roughly configured.
The gasket 48 is an elastic body, for example, silicone rubber. As in the prior art, the gasket 48 is
an element responsible for causing the panel 44 to float from the front case 42 so as to make the
panel easily vibrated by the vibration transmitted from the piezoelectric element 46 to the panel
44. It plays a role of preventing vibration transmission to the front case 12.
[0004]
As shown in FIG. 12, the substrate 50 is attached to the front case 42 through the LCD frame 52,
and an LCD (Liquid Crystal Disply) 54 as a display unit is attached to the LCD frame 52. And a
dustproof cushion 56 (FIGS. 11 and 12). The rear cover 58 is fitted and fixed to the front case 42.
[0005]
Patent Document 1 discloses a panel speaker in which one excitation driver for vibrating the
acoustic diaphragm is provided at a position other than the central portion of the acoustic
diaphragm. And, in that embodiment, the plate thickness of the acoustic diaphragm is shown to
be uniform.
[0006]
In addition, Patent Document 2 has a drive unit for vibrating the both ends of the diaphragm
separately, and a panel speaker formed by making the plate thickness of the central part of the
diaphragm driven by the drive different from that of the end. Is disclosed. And in the example, it
has shown that the diaphragm is being fixed to the edge of the frame which comprises a panel
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speaker. Further, Patent Document 3 discloses a speaker in which the plate thickness of the
second diaphragm to which the vibration generated in the first diaphragm driven by the voice
coil is transmitted through the sealed space is formed uneven. It is done. JP-A-2000-358290 JPA-2004-343481 JP-A-2004-040294
[0007]
The above-described known flat panel speaker 40 is configured of a thin plate having a uniform
thickness and flat with the front and back of the panel 44. The panel in the vicinity where the
piezoelectric element 46 is attached (fixed) directly receives the vibration from the piezoelectric
element 46 and makes a large vibration (deformation), but since the vibration is attenuated and
transmitted to the periphery, it is equal In addition, there is a technical problem of not being
transmitted smoothly, and there is also a technical problem of being difficult to vibrate the panel
44 in the vicinity where the piezoelectric element 46 is attached if the panel is simply thickened.
[0008]
Moreover, although patent document 1 arranges an excitation driver in positions other than the
center part of an acoustic diaphragm, since the plate | board thickness of an acoustic diaphragm
is made uniform, it is technically similar to a well-known flat panel speaker. There is a problem.
Moreover, although patent document 2 and patent document 3 also show that the plate thickness
of a diaphragm is made uneven, patent document 2 vibrates the electromagnetic force generation
means which has a coil which is a drive part, and a magnet. Patent Document 3 shows a
configuration arranged at both ends of the plate to vibrate the diaphragm, and Patent Document
3 shows a configuration transmitting the vibration of the first diaphragm to the second
diaphragm through the sealed space. However, these two patent documents solve the technical
problems in the above configuration by using means for changing the thickness of the diaphragm
depending on the position of the diaphragm.
[0009]
The present invention has been made in view of the above-described circumstances, and an
object thereof is to provide a panel speaker capable of achieving efficient transmission of the
vibration of the vibrating element to the peripheral portion of the panel.
[0010]
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In order to solve the above-mentioned problems, the invention according to claim 1 is a vibration
panel which is supported on the electronic device body through a gasket and generates a sound
wave, and is mounted on and bonded to the vibration panel to acoustically vibrate an electric
voice signal. The panel speaker is characterized in that the thickness of the vibrating panel is
gradually reduced as it proceeds from the vibrating element to the peripheral portion of the
vibrating panel.
[0011]
The invention according to claim 2 relates to the panel speaker according to claim 1,
characterized in that the material of the vibration panel is acrylic or polycarbonate, acrylonitrile
butadiene styrene.
[0012]
According to a third aspect of the present invention, there is provided a vibration panel floatingly
supported on the electronic device body via a gasket and generating a sound wave, and a
vibration element mounted on and bonded to the vibration panel to convert an electrical sound
signal into acoustic vibration. Of the vibration element from the asymptotic hard material to the
soft material to form the vibration panel or as the vibration element proceeds from the vibration
element to the peripheral portion. The vibrating panel is formed with a gradually decreasing
thickness and the vibrating panel is formed by changing the material from an asymptotic hard
material to a soft material as going from the vibrating element to the peripheral portion of the
vibrating panel. .
[0013]
According to a fourth aspect of the present invention, there is provided a vibrating panel
floatingly supported on the electronic device main body through a gasket and generating a sound
wave, and a vibrating element mounted on the vibrating panel to convert an electric voice signal
into acoustic vibration. The above gasket is formed by gradually changing from a hard material
to a soft material as going from the vibrating element to the peripheral portion of the vibrating
panel, or becoming gradually thinner as going from the vibrating element to the peripheral
portion The vibrating panel is formed to have a plate thickness, and the material is changed from
a hard material to a soft material gradually from the vibrating element to the periphery of the
vibrating panel to form the gasket.
[0014]
According to a fifth aspect of the present invention, there is provided a vibration panel floatingly
supported on an electronic device body through a gasket and generating a sound wave, and a
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vibration element mounted on and bonded to the vibration panel to convert an electrical sound
signal into acoustic vibration. The gasket is formed with a gradually increasing width to a narrow
width as it proceeds from the vibrating element to the peripheral portion of the vibrating panel,
or gradually thinner as it proceeds from the vibrating element to the peripheral portion of the
vibrating panel The vibration panel is formed to have a plate thickness as described above, and
the gasket is formed to have a gradually wide width to a narrow width as it proceeds from the
vibration element to the periphery of the vibration panel.
[0015]
The invention according to claim 6 relates to the panel speaker according to any one of claims 1
to 5, characterized in that the vibration element is joined to the vibration panel at a
predetermined position of the vibration panel. .
[0016]
The invention according to claim 7 relates to the panel speaker according to claim 6,
characterized in that the vibration element is joined to the vibration panel at the peripheral
portion in the longitudinal direction of the vibration panel.
[0017]
The invention according to claim 8 relates to the panel speaker according to any one of claims 1
to 7, wherein the vibration panel is formed of a transparent material, and the image display unit
is mounted on the back surface of the vibration panel. It is characterized by being done.
[0018]
The invention according to claim 9 relates to the panel speaker according to claim 8, wherein the
electronic device main body is a mobile phone main body, and the vibration panel is transparent
on the front surface of an image display unit for displaying an image received by the mobile
phone. Is characterized by being implemented.
[0019]
According to the present invention, the panel thickness of the panel of the panel speaker having
the vibrating element to be joined to the panel is formed thicker at the joint between the
vibrating element and the panel and thinner from the joint toward the periphery Therefore, the
vibration generated by the vibration element can be efficiently and uniformly transmitted to the
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entire panel area, and the whole panel can be uniformly vibrated.
This effect can also be obtained by changing the material of the panel, the material of the gasket,
and the width thereof from the vibrating element toward the periphery of the panel.
[0020]
According to the present invention, the panel thickness of the panel of the panel speaker having
the vibrating element to be joined to the panel is formed thicker at the joint between the
vibrating element and the panel and thinner from the joint toward the periphery. Be done.
The present invention can also be configured by changing the material of the panel, the material
of the gasket, and the width thereof in the same manner as the thickness of the panel.
[0021]
1 is a perspective view of a mobile phone equipped with a panel speaker according to a first
embodiment of the present invention, FIG. 2 is a front view of the panel speaker, and FIG. 3 is a
cross section along line F3-F3 of the panel speaker FIG. 4 is an enlarged view of the panel of the
panel speaker, FIG. 5 is a cross-sectional view of the panel speaker along line F5-F5, FIG. 6 is a
cross-sectional view of the panel speaker along line F6-F6, FIG. 7 is an exploded view of the panel
speaker.
[0022]
The panel speaker 10 of this embodiment relates to a panel speaker in which the thickness of the
panel is reduced from the vibrating element (piezoelectric element) attached to the panel to the
periphery of the panel, and as shown in FIG. A panel 14 is sandwiched between a panel 14 whose
peripheral portion is attached to 12, a vibrating element (piezoelectric element) (DMA) 16
attached (fixed) to the panel 14, and the front case 12 and the panel 14 to front the panel 14. It
is roughly configured with a gasket 18 attached to the case 12.
An example in which the panel speaker 10 is mounted is a mobile phone 11 as shown in FIG. 1,
and the mobile phone 11 includes a call unit 13 and a receiver unit 15.
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[0023]
The structure of the panel speaker 10 mounted on the mobile phone 11 is shown in FIGS. 4 to 6,
and an exploded view thereof is shown in FIG.
As shown in FIG. 3, the panel speaker 10 is configured by floatingly supporting (floatingly
supporting) the panel 14 to which the piezoelectric element 16 is attached to the front case 12
by the gasket 18 (FIG. 5, FIG. 6) ).
The purpose of this floating support is the same as conventional flat panel speakers.
The piezoelectric element 16 is driven by a drive circuit (not shown) mounted on the substrate
20 to generate acoustic vibration from the panel 14.
In the panel 14 driven by the piezoelectric element 16, as shown in FIG. 4, the plate thickness of
the panel portion to which the piezoelectric element 16 is attached is increased, and as it is
farther from the application position of the piezoelectric element 16 (in FIG. The thickness of the
panel portion is made thinner as it goes).
The panel 14 is formed of a transparent acrylic material.
[0024]
As shown in FIG. 5, the substrate 20 is attached to the front case 12 via the LCD frame 13, the
LCD 24 serving as the display unit is attached to the LCD frame 13, and the LCD 24 is a
dustproof cushion between itself and the panel 14. 26 (Figs. 3 and 5) are assembled.
The rear cover 22 is fitted and fixed to the front case 12.
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The gasket 18 is an elastic body, for example, silicone rubber, and is an element responsible for
floating the panel 14 from the front case 12 as in the prior art.
[0025]
Next, the operation of this embodiment will be described with reference to FIGS.
The panel speaker 10 of this embodiment is attached to the portable telephone 11 (FIG. 1) in
such a manner that the panel 14 is attached to the front case 12 via the gasket 18. Then, a drive
signal corresponding to an audio signal is applied from the drive circuit mounted on the
substrate 20 to the piezoelectric element 16 attached to the panel 14. The piezoelectric element
16 to which the drive signal is applied generates a vibration corresponding to the audio signal.
The vibration generated by the piezoelectric element 16 vibrates the panel 14. The vibration
generated in the panel 14 propagates to the periphery of the panel 14.
[0026]
As described above, since the panel 14 is formed thinner toward the periphery from the base to
which the piezoelectric element 16 is attached, the vibration of the piezoelectric element 16 is
uniformly and efficiently applied to the periphery of the panel 14 It can propagate and vibrate
the entire panel 14 uniformly.
[0027]
As described above, according to the configuration of this embodiment, the thickness of the panel
is thicker at the piezoelectric element attachment portion and thinner toward the periphery
thereof, so that the vibration generated by the piezoelectric element is evenly distributed over the
entire panel. It can be well transmitted and the whole panel can be vibrated uniformly.
[0028]
The structure of the panel speaker which is Example 2 of this invention is the same as that of
Example 1. FIG.
The construction of the embodiment is largely different from that of the embodiment 1 in that
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the panel is made of a soft material such as PC (Polycarbonate) or ABS (Acrylonitrile Butadiene
Styrene).
By making the material of the panel PC, ABS, etc., it is possible to increase the transmissibility of
the vibration given from the piezoelectric element to the panel, efficiently transmit the vibration
to the periphery of the panel efficiently, and vibrate the whole panel uniformly. . Further, the
material of the panel is partially changed. For example, the material in the vicinity of the
piezoelectric element is made hard and the periphery is made soft. Also by this, the same effect
as the case where the whole panel is made of a soft material can be expected.
[0029]
As described above, according to the configuration of this embodiment, the entire panel is made
of a soft material, or the vicinity of the piezoelectric element is made a hard material, and the soft
material is moved toward the periphery. The transmission rate of vibration can be increased, and
the vibration can be efficiently transmitted uniformly to the periphery of the panel, and the entire
panel can be uniformly vibrated.
[0030]
The structure of the panel speaker which is Example 3 of this invention is the same as that of
Example 1.
The configuration of this embodiment differs greatly from that of Embodiment 1 in that the
material of the gasket adhering the panel to the front case (casing) is partially changed, for
example, when silicone rubber is used for the gasket When the hardness of the silicone rubber is
partially softened, the panel in the vicinity thereof is easily vibrated, and when it is partially
hardened, the panel in the vicinity thereof is hardly vibrated. Therefore, if the hardness of the
silicone rubber in the vicinity of the piezoelectric element is made hard and the hardness of the
silicone rubber in the periphery is made soft, the same effect as in the case of Example 2 can be
obtained.
[0031]
As described above, according to the configuration of this embodiment, since the material of the
gasket adhering the panel to the front case is partially changed to promote the transmission of
the vibration, the vibration given from the piezoelectric element to the panel is Can be efficiently
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transmitted to the periphery of the panel uniformly, and the entire panel can be vibrated
uniformly.
[0032]
FIG. 8 is a front view of a panel speaker that is Embodiment 4 of the present invention, and FIG. 9
is a perspective view including a gasket of the panel speaker.
The construction of this embodiment differs greatly from that of Embodiment 1 in that the width
of the gasket is partially changed.
[0033]
That is, the panel speaker 10A of this embodiment is configured by widening the width of the
gasket 18A near the piezoelectric element 16 and narrowing the width of the peripheral gasket
18A. The panel 14 near the wider gasket 18A is less likely to vibrate, and the panel 14 near the
narrower gasket 18A is more likely to vibrate. Therefore, if the width of the gasket in the vicinity
of the piezoelectric element is increased and the width of the gasket in the periphery is
decreased, the same effect as that of the second embodiment can be obtained.
[0034]
As described above, according to the configuration of this embodiment, the width of the gasket in
the vicinity of the piezoelectric element is increased, and the width of the gasket in the periphery
is decreased. Therefore, the transmission rate of the vibration given from the piezoelectric
element to the panel is increased. The vibration can be efficiently and uniformly transmitted to
the periphery of the panel, and the entire panel can be uniformly vibrated.
[0035]
Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration of the present invention is not limited to these
embodiments, and a design within the scope of the present invention is not limited. Even if there
are changes etc., they are included in the present invention.
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For example, the degree of decrease in the thickness of the panel in the circumferential direction
may be uniform, or the rate of decrease may be changed. The second embodiment, the third
embodiment and the fourth embodiment have been described on the premise that the plate
thickness of the panel decreases in the peripheral direction from the attachment portion with the
piezoelectric element, but the material of the panel and its portion Changes, partial changes in
the material of the gasket, and partial changes in the width of the gasket may be made
independent of the thickness. Also, the joining means between the panel and the vibrating
element may be any means as long as the vibration from the vibrating element to the panel can
be transmitted successfully.
[0036]
The panel speaker disclosed herein can also be used for other mobile terminal devices of mobile
phones and other audio devices.
[0037]
It is a perspective view of the mobile telephone carrying the panel speaker which is Example 1 of
this invention.
It is a front view of the panel speaker. It is sectional drawing along line F3-F3 of the panel
speaker. It is an enlarged view of the panel of the panel speaker. It is sectional drawing along line
F5-F5 of the flat panel. It is sectional drawing along line F6-F6 of the flat panel. It is an exploded
view of the panel speaker. It is a front view of the panel speaker which is Example 4 of this
invention. It is a perspective view including the gasket of the panel speaker. It is a front view of
the flat panel speaker used with the conventional mobile telephone. It is sectional drawing along
line F11-F11 of the flat panel speaker. It is sectional drawing along line F12-F12 of the flat panel
speaker. It is sectional drawing along line F13-F13 of the flat panel speaker.
Explanation of sign
[0038]
10, 10A Panel Speaker 12 Front Case (Electronic Device Main Body) 14 Panel (Vibration Panel)
16 Piezoelectric Element (Vibration Element) 18 Gasket
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