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JP2005303938

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DESCRIPTION JP2005303938
PROBLEM TO BE SOLVED: To make a panel panel sound generator thin easily and effectively.
SOLUTION: A front side of a panel 21 in a base 11 is provided with a piezoelectric bimorph
element 31 having a panel 21 vibratably installed on a base 11 with a peripheral portion
excluding a front side via a support member 22 and driving the panel 21. The piezoelectric
bimorph element 31 is disposed on the base 11 with the two fixing members 32 interposed
therebetween, and the upper surface of the central portion of the piezoelectric bimorph element
31 and the upper surface of the front side of the sound generating member 21 are arranged. The
connection member 33 connects. Since the piezoelectric bimorph element 31 is in the form of
two-point support (or two-point restraint), the central portion thereof is the largest displacement
(vibration) region that is most displaceable. Therefore, the piezoelectric bimorph element 31
transmits the displacement of the maximum displacement region to the fixing member 32 to the
panel 21 through the connecting member 33. Since the piezoelectric bimorph element 31 is
disposed on the outside of the panel 21 that generates a sound wave, the device is thinned.
[Selected figure] Figure 1
Panel sound generator
[0001]
The present invention makes it possible to reduce the thickness of a panel sound generating
device or the like which gives feedback to the user for input operation of a panel speaker or a
touch panel where the panel is vibrated by a piezoelectric bimorph element and vibrates the
touch panel using the piezoelectric bimorph element. The present invention relates to a sound
generator.
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1
[0002]
Recently, a panel speaker in which an image display device and a speaker are integrated has
been proposed for the purpose of enhancing a sense of unity between an image and a sound.
New Transducers Limited has already commercialized a panel speaker in which a vibrating
element (exciter) is incorporated in part of the foam material panel. In addition, a transparent
panel is placed in front of the LCD screen, and a product incorporating an exciter in this
transparent panel has also been produced. Many other patents have been filed for these panel
speakers (see, for example, Patent Document 1). Many of those introduced in these use an
electromagnetic conversion element as an exciter.
[0003]
On the other hand, as an example in which a piezoelectric bimorph element is used for an exciter,
a structure in which only the central portion of the piezoelectric bimorph element is connected to
a panel has been proposed (see Patent Document 2). This example is shown in FIG. In this
method, the panel 21 is vibratably supported on the base 11 via the support member 22, and the
central portion of the piezoelectric bimorph element 31 having the weight 34 attached to both
ends is connected to the panel 21 via the connection member 35, This is a method of vibrating
the piezoelectric bimorph element 31. In this method, a piezoelectric bimorph element 31 having
a weight 34 attached to both ends hangs on the panel 21. This is a principle that a weight
(weight 34 + piezoelectric bimorph element 31) is applied when viewed from the panel side, and
the panel itself is also vibrated by the vibration of the weight.
[0004]
These panel speakers generate surface resonance of the panel by adding a vibration generating
source (piezoelectric bimorph element) to the panel to generate sound, and generate a sound
wave using the natural vibration mode of the panel itself. However, these panel speakers have a
problem that the method of attaching a vibration source for generating vibrations in the panel is
difficult. Further, particularly for the thinning of portable devices, the thinning of these panel
speakers themselves is also required. JP-A-2002-533957 JP-A-Hei-512256
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2
[0005]
An object of the present invention is to provide a panel panel sound generator using a
piezoelectric bimorph element which can be easily thinned effectively.
[0006]
In the panel acoustic generator according to the present invention, the strip-like piezoelectric
bimorph element is disposed outside the acoustic generation member that generates a sound
wave, and both ends of the piezoelectric bimorph element are connected to a fixing member that
does not contribute to the sound generation. The central portion is connected to the sound
generating member, and the sound generating member is vibrated by vibration of the
piezoelectric bimorph element interposed between the fixing member and the sound generating
member to generate a sound wave.
[0007]
The invention according to claim 2 is characterized in that, in the panel sound generation device
according to claim 1, two or more piezoelectric bimorph elements are connected to the sound
generation member.
[0008]
According to the present invention, since the piezoelectric bimorph element is disposed outside
the sound generating member for generating the sound wave, the panel sound generating
apparatus using the piezoelectric bimorph element can be thinned easily and effectively.
[0009]
The basic structure of a panel sound generator according to the present invention is shown in
FIG.
With reference to FIG. 1, the sound generating member (panel) 21 is installed on the base 11
with the peripheral portion excluding the front side through the panel support member 22, and
the strip-like piezoelectric bimorph element 31 for driving the sound generating member 21 is
The piezoelectric bimorph element 31 is disposed at the center of the outer side (front side) of
the front side of the sound generating member 21 in the base 11 and near both ends of the
piezoelectric bimorph element 31 via the two element fixing members 32. A connection member
33 connects the upper surface of the central portion 31 and the front upper surface of the sound
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3
generation member 21.
[0010]
Since this piezoelectric bimorph element 31 is in the form of two-point support (or two-point
restraint) by two fixing members 32, as shown in FIG. Become.
Therefore, the piezoelectric bimorph element 31 can transmit the displacement of the maximum
displacement region to the fixing member 32 through the connecting member 33 to the sound
generating member 21.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 3 shows an example in which a resistance change type touch panel used for an information
portable terminal or the like is used as a panel speaker.
In the figure, the same components as in FIG. 1 are given the same reference numerals. In the
touch panel, an outer peripheral portion is fixed to a housing or a liquid crystal module of an
apparatus via a double-sided adhesive tape or the like.
[0012]
The embodiment corresponds to the case where the touch panel 21A and the piezoelectric
bimorph element 31 are fixed to the liquid crystal module side. The touch panel 21A is
supported, as a panel support member 22, with a foamed polyethylene adhesive tape or the like
having a thickness of about several hundred μm, with the periphery excluding the front side
being a base of the liquid crystal module 11A. In addition, the piezoelectric bimorph element 31
is supported at two points at a central portion outside the front side of the touch panel 21A in
the base 11A, using a foamed polyethylene adhesive tape having a thickness of several hundred
11-05-2019
4
μm as a fixing member 32. An upper surface of a substantially central portion of the
piezoelectric bimorph element 31 and an upper surface of a front portion of the touch panel 21A
are connected as a connecting member 33 with an adhesive tape made of a material having a
relatively high elastic modulus based on PET resin.
[0013]
The piezoelectric bimorph element 31 is connected to be driven through a circuit (not shown)
when the user performs an input operation on the touch panel 21A, and when the user performs
an input operation on the touch panel 21A, the touch panel 21A vibrates or generates sound. The
output is made to be fed back to the input operator.
[0014]
The piezoelectric bimorph element 31 is composed of piezoelectric elements 31a and 13b in a
relationship in which expansion and contraction are reversed by an applied voltage, and an
intermediate plate 13c provided therebetween (FIG. 1).
As the piezoelectric elements 31a and 13b, it is desirable to use lead zirconate titanate (generally
called: PZT) having a large displacement amount / applied voltage. With regard to the material
composition, its characteristics can be changed by a small amount of additive etc. However, the
d31 constant generally known as a constant showing the performance of displacement amount /
voltage is 100 to 400 (× 10 <− 12> m / V) is used.
[0015]
Electrodes are respectively formed on both surfaces of the piezoelectric elements 31a and 13b,
and the respective electrode surfaces are insulated from each other (not shown). The electrodes
are formed by, for example, a plating method, a sputtering method, a vapor deposition method,
or printing / baking, and Ni, Ag, Au, Cu or the like is used as an electrode material. In addition, in
order to improve displacement amount / voltage characteristics of the piezoelectric elements 31a
and 13b, a structure in which the piezoelectric elements are laminated can be used. As the
intermediate plate 13c, a metal material having conductivity, such as a stainless steel alloy
system or a nickel alloy system, is mainly used, but a non-conductive material may be used.
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5
[0016]
Since the piezoelectric bimorph element 31 is supported at two points in the vicinity of both ends
by two fixing members 32, the element fixing member 32 does not disturb the vibration of the
piezoelectric bimorph element 31, and in order to stabilize the position, predetermined adhesion
An adhesive tape having a force is suitable. For example, a double-sided adhesive tape based on a
flexible material having a cushioning property such as foamed polyurethane, foamed acrylic,
foamed butyl rubber, or a silicon material, a double-sided adhesive tape based on PET or
polyimide, and the like. For example, a tape called No 5713 manufactured by Nitto Denko
Corporation is a double-sided pressure-sensitive adhesive tape based on special foamed
polyurethane, the tape thickness is 0.33 mm, and it has flexibility and thickness suitable for the
example. ing.
[0017]
The connection member 33 connecting the piezoelectric bimorph element 31 and the touch
panel 21A desirably transmits the vibration generated in the piezoelectric bimorph element 31 to
the touch panel 21 as much as possible without loss, and is a plastic material having a relatively
high elastic modulus such as PET or polyimide. And a single-sided adhesive tape based on metal
foil. It is desirable that the adhesion be as high as possible.
[0018]
The touch panel 21A is fixed to the base 11A such as the liquid crystal module side, but a panel
support member 22 such as a double-sided tape in which three sides other than the front side of
the touch panel 21A to which the piezoelectric bimorph element is connected has an arbitrary
thickness. It is fixed by. The panel support member 22 is suitably a double-sided pressuresensitive adhesive tape based on a flexible material having a cushioning property such as, for
example, foamed polyurethane, foamed acrylic, foamed polyethylene, foamed butyl rubber, or
silicone material, having a predetermined elongation. There is.
[0019]
As for the arrangement of the panel support member 22, it is necessary to hold the panel with
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predetermined strength and reliability while not disturbing the vibration of the panel as much as
possible, as shown in FIGS. 4A to 4D. There are several placement methods. These should be
determined in consideration of the required performance and reliability.
[0020]
In addition, as the connection member 33 between the piezoelectric bimorph element 31 and the
panel 21, in order to increase the strength of the connection portion, it is also possible to use Tshaped connection members 33a and 33b as shown in FIGS. 5 (A) and 5 (B). it can. Since the
piezoelectric bimorph element 31 is bent and displaced, there is a possibility that the bending
displacement of the piezoelectric bimorph element 31 may be inhibited if the connecting
member 33 is attached to the entire surface, so it is difficult to increase the bonding area of the
connecting member 33. By using the connecting members 33a and 33b having a shape, it is
possible to increase the bonding area on the panel side and to increase the strength of the
connecting portion.
[0021]
For example, as shown in FIG. 6, the piezoelectric bimorph unit 30 including the piezoelectric
bimorph element 31 and the element fixing member 32 is disposed on the panel 21 outside the
front side and the rear side of the panel 21 in the base 11. For example, by arranging a plurality
of piezoelectric bimol units 30 for one panel and connecting them with the connection member
33, the excitation force to the panel 21 is increased, and thereby it is possible to generate a
larger sound. Become.
[0022]
Below, the difference between the device of the present invention and the conventional device
will be described.
[0023]
In the conventional device (FIG. 8), a piezoelectric bimorph element 31 (piezoelectric bimorph
unit 30A) having a weight 34 at both ends is connected to the panel 21 by a connecting member
35 and hung.
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7
The piezoelectric bimorph unit 30A is disposed at a lower portion of the panel 21 in the direction
perpendicular to the sound generation surface of the panel 21, whereby the thickness of the
device is increased by the margin for preventing contact with the piezoelectric bimorph unit 30A.
Further, in the conventional device, the vibration amplitude of the piezoelectric bimorph element
31 is generated not at the panel connection portion but at the free end side of the piezoelectric
bimorph element 31, and the panel 21 generates a reaction force generated at the fixing portion
of the piezoelectric bimorph element 31. Received and vibrated.
[0024]
On the other hand, in the device of the present invention (FIG. 3), the piezoelectric bimorph
element 31 and the element fixing member 32 (piezoelectric bimorph unit 30) are disposed
outside in the horizontal direction with respect to the sound generation surface of the panel 21.
Therefore, it is possible to suppress an increase in the thickness of the device. If the thickness of
the piezoelectric bimorph element 31 is equal to or less than the thickness of the panel 21, the
thickness increase factor may be caused only by the thickness of the panel 21 or the panel
support member 32 of the piezoelectric bimorph element 31 and the thickness of the connection
member 33. Become. Further, in the device of the present invention, as shown in FIGS. 1 and 2,
since the maximum displacement portion of the piezoelectric bimorph element 31 is connected
to the panel 21 by the connection member 33, the displacement of the piezoelectric bimorph
element is directly transmitted to the panel 21. Be done.
[0025]
As described above, the device of the present invention has an arrangement structure that
suppresses an increase in the thickness direction of the panel. A structural comparison of the
conventional device and the device of the present invention is shown in FIG. In the conventional
device, as shown in FIG. 7 (A), the piezoelectric bimorph unit 30A is disposed on the back side A
of the panel 21 so that the portion A becomes thick, whereas in the device of the present
invention as shown in FIG. 7 (B). Since the piezoelectric bimorph unit 30A is disposed on the
outer side B of the panel 21, the apparatus can be thinned, but a space is required on the outer
side B of the panel 21. However, since information portable devices of recent years are strongly
required to reduce the thickness, the present invention is more advantageous when the thickness
is required.
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[0026]
(A), (B) is the front view and side view which show the basic structure of the panel sound
generator which concerns on this invention. The largest displacement area | region explanatory
drawing of a piezoelectric bimorph element. The perspective view which shows the panel sound
generator which concerns on the Example of this invention. (A)-(D) are top views which show the
example of arrangement | positioning of a panel panel supporting member. (A), (B) is a top view
which shows the example of a shape of a connection member. FIG. 2 is a perspective view
showing a panel sound generator using two piezoelectric bimorph elements. The structure
comparison figure of the conventional apparatus and the apparatus of this invention. The
perspective view which shows the panel sound generator which concerns on a prior art example.
Explanation of sign
[0027]
11: base 11A: liquid crystal module (base) 12: sound generation member (panel) 12A: touch
panel 22: support member 30, 30A: piezoelectric bimorph unit 31: piezoelectric bimorph element
32: fixing member , 33 ... connecting member, 34 ... weight, 35 ... connecting member.
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