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JP2007180827

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DESCRIPTION JP2007180827
PROBLEM TO BE SOLVED: To provide a panel type speaker excellent in acoustic characteristics
with a small size and a simple structure. SOLUTION: In a panel type speaker in which a bottom
surface (10a, 20a) of a piezoelectric exciter is fixed to a part of a vibration panel (3), it opposes a
bottom surface (10a, 20a) of a piezoelectric exciter in the vibration panel (3). A fixing member
(11) is provided between the limited portion (P) of the surface portion and the bottom surface of
the piezoelectric exciter, and the piezoelectric exciter is fixed to the vibrating panel (3). Provide a
flexible auxiliary connection member (12) such as a sponge at a portion (Q) other than the
limited portion (P) of the surface portion of the vibration panel (3) opposite to the bottom surface
(10a, 20a) of the piezoelectric exciter. Can. [Selected figure] Figure 2
Panel type speaker
[0001]
The present invention relates to a panel type speaker, and more particularly to a small panel type
speaker suitable for application to small electronic devices such as mobile phones.
[0002]
A panel type speaker installed in a cellular phone or the like is required to have high
performance and small size.
An example of a mobile phone with a panel type speaker is disclosed as this prior art (see, for
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example, Patent Document 1). FIG. 6 is a plan view showing the configuration of the display
portion of the panel-type speaker equipped mobile phone in the prior art. The display portion of
the mobile phone includes a case 1, a liquid crystal panel 2, a vibration panel 3 which doubles as
a light transmitting protection panel, and an exciter (excitation element) 6. The liquid crystal
panel 2 is held by the case 1 with a soft elastic coupling member such as a sponge interposed.
The vibration panel 3 of the panel type speaker is held by the case 1 above the liquid crystal
panel 2 with a soft elastic coupling member such as a sponge interposed. In addition, an exciter
(excitation element) 6 is held by a part of the vibration panel 3, and bending vibration is excited
in the vibration panel 3.
[0003]
Such panel type speakers include a vibration panel and a piezoelectric exciter held by a part of
the vibration panel. As a prior art of the piezoelectric exciter mounted on the panel type speaker,
the device is dropped In order to prevent the piezoelectric element contained in the piezoelectric
exciter from being destroyed by the impact and for ease of handling, the case where the
piezoelectric exciter has a box-shaped case structure to protect the piezoelectric element inside is
used. It is disclosed. (For example, refer to nonpatent literature 1.).
[0004]
FIG. 7 is a cross-sectional view showing an example of a piezoelectric exciter having a box-shaped
case structure. As shown in FIG. 7, the case c of the flexural vibration type exciter is made of an
electrically insulating resin, and its outer shape has a rectangular solid shape. Inside the case c,
two rectangular plate-like piezoelectric exciters b1 and b2 (hereinafter, simply referred to as
"beams") are accommodated over their entire lengths. Each beam constitutes a cantilever whose
one end is held by the case c and the other terminal is a free end. That is, a holding portion for
holding the beams b1 and b2 is formed on one side of the case c (the left side in the embodiment
in this embodiment). The adhesive layer f is formed between the inner wall surface of the case c
facing the beams b1 and b2 and one end of each beam, whereby the beams b1 and b2 are held
inside the case c. This flexural vibration type exciter is incorporated as a speaker into a mobile
phone or the like.
[0005]
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Further, there is disclosed an example of a panel-type speaker in which a box-shaped
piezoelectric exciter is attached to a part of a vibrating panel which also serves as a translucent
protective panel (see, for example, Non-Patent Document 2). As shown in FIG. 8A, the liquid
crystal panel 2 is provided with a vibration panel 3 which also serves as a transparent protective
panel for protecting the display surface. The vibrating panel 3 is extended to the outside of the
display surface on one side of the liquid crystal panel 2, and a box-shaped piezoelectric exciter
20 is attached to the back of the extended portion by an adhesive.
[0006]
FIG. 8 (b) shows a rear view of the piezoelectric exciter 20 taken along line A-A of FIG. 8 (a). The
piezoelectric exciter 20 in this conventional example has two beams B1 and B2 attached to an
elongated case. The case includes a top plate 20a, a bottom plate 20b, and an exciter support
20d provided between the top plate 20a and the bottom plate 20b (at a central position as
viewed in FIG. 8B). The upper plate 20a and the lower plate 20b are connected to each other at
the left and right ends of the front side and the rear side, respectively. The entire bottom plate
portion 20b of the case is fixedly attached to a part of the protective panel by a fixing member 8
such as an adhesive tape.
[0007]
Patent Document 1: Japanese Patent Application Laid-Open No. 2004-336403 (page 3-5, FIG. 15) Japanese Patent Application No. 2003-365507 (page 2; FIG. 1) Japanese Patent Application
No. 2003-189935 (Page 4: FIG. 1, 9) )
[0008]
However, the panel-type speaker in the prior art is fixed to the vibration panel using an adhesive
tape or the like on almost the entire bottom surface of the piezoelectric exciter so as not to be
separated from the vibration panel by a drop impact.
Therefore, there is a problem that the flatness of the frequency characteristic is bad and the
acoustic characteristic is poor. Further, it is known that the acoustic characteristics of the panel
type speaker in the prior art are affected by various members constituting the panel type
speaker. However, in terms of the design of the actual device, these various components can not
always be designed with priority given to acoustic characteristics, and are limited by the
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downsizing of the device and the arrangement of other components. There is a problem that it is
difficult to add an adjustment mechanism for sound quality correction and it is difficult to adjust
the acoustic characteristics.
[0009]
(Object of the Invention) The present invention has been made in view of the above-mentioned
problems, and it is an object of the present invention to provide a panel-type speaker excellent in
acoustic characteristics.
[0010]
A panel-type speaker comprising: a vibrating panel (indicated by reference numeral 3 in the
description of the embodiment described below); and a piezoelectric exciter (10, 20) for vibrating
the vibrating panel, the vibration exciter comprising a case (C) and piezoelectric exciters (b1, b2,
B1, B2) set in the case, the case being close to one surface of the vibrating panel and facing the
panel In the description of the embodiment, the panel has a bottom surface 10a, 20a), and the
panel proximity surface is a fixed region (corresponding to the first region P) and the other
remaining regions (corresponding to the second regions Q, R) A facing surface portion of the
vibration exciter facing the panel proximity surface of the vibration exciter, the fixing region
(corresponding to the first region P) and the other remaining region (second region Q,
Corresponding to R), and An adhesion layer (high elasticity in the same embodiment) provided
between the adhesion area of the panel proximity surface of the sider and the adhesion area of
the opposite surface portion of the vibration panel to fix the vibration exciter to the vibration
panel And a double-sided adhesive tape 11).
[0011]
A flexible, at least partially provided between the remaining area of the panel proximal surface of
the vibration exciter and the remaining area of the opposite surface portion of the vibrating
panel to connect both remaining areas. An auxiliary layer (corresponding to a low modulus
double-sided adhesive tape 12) formed of a member can be provided.
[0012]
In this case, the auxiliary layer can be formed of a flexible member such as a sponge.
[0013]
In addition, an auxiliary layer partially provided to connect the remaining regions between the
remaining region of the panel proximity surface of the vibration exciter and the remaining region
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of the facing surface portion of the vibrating panel. And the auxiliary layer (the high elastic
modulus fixing member 11c) can be formed of the same material as the fixing layer.
[0014]
The piezoelectric exciter has a fixed portion (corresponding to the holding portion 16) fixed to
the case, and a vibrating portion extending from the fixed portion to the free end, and the fixed
portion corresponds to the one surface of the vibrating panel. The orthogonal regions may be
aligned with the anchoring area of the face portion of the outer surface of the oscillating exciter
and the anchoring area of the opposing face portion of the vibrating panel.
[0015]
The fixed portion of the piezoelectric exciter may have a vibrating portion at one end of the case
in a direction parallel to the one surface of the vibrating panel and extending from the fixed
portion toward the other end of the case. .
[0016]
In another example, the fixed portion of the piezoelectric exciter is located at a central portion in
the case in a direction parallel to the one surface of the vibrating panel in the case, and the two
piezoelectric vibrators extend on both sides from the fixed portion. It is possible to have
[0017]
The fixing layer can be formed by a double-sided adhesive tape.
[0018]
When the auxiliary layer is provided, the fixing layer and the auxiliary layer can each be formed
of a double-sided adhesive tape.
[0019]
The present invention is also a panel type speaker, comprising: a vibration panel; a piezoelectric
exciter for vibrating the vibration panel; a case; and a piezoelectric exciter set in the case, the
case A vibration exciter having a panel proximity surface close to and facing the panel, the panel
proximity surface of the vibration exciter, and the panel proximity surface of the vibration exciter
facing the panel. And a flat portion (31a) fixed to the panel near surface, and a fixed portion
(31a) spaced from each other from the flat portion toward the vibration panel. There is provided
a panel type speaker comprising: a first portion (31b) extending and being fixed to the vibration
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panel; and a fixing member (31) having a second portion (31c)
[0020]
The fixing member may be integrally molded with the case.
[0021]
The first and second portions can be welded or adhered to the vibrating panel.
[0022]
As described above, according to the present invention, the area of the bottom surface of the
piezoelectric exciter fixed to the vibration panel is selectively limited, and the bottom surface of
the piezoelectric exciter and the vibration panel are fixed by the fixing member. The sound
quality can be easily improved, and a panel-type speaker excellent in acoustic characteristics can
be provided.
[0023]
Hereinafter, embodiments of the present invention will be described based on the attached
drawings.
[0024]
FIG. 1 shows the configuration of the panel type speaker according to the first embodiment, FIG.
1 (a) is a perspective view showing a liquid crystal display combined with the panel type speaker,
and FIG. 1 (b) is a view It is BB sectional drawing in 1 (a).
In FIG. 1A, the liquid crystal display device 2 is depicted from the back side.
A vibrating panel 3 is attached to the front of the liquid crystal display device 2 as a transparent
protective panel for protecting the display surface.
The vibrating panel 3 is extended to the outside of the display surface on one side of the liquid
crystal display device 2, and the piezoelectric exciter 10 is attached to the back surface of the
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extended portion.
[0025]
As shown in FIG. 1B, in the piezoelectric exciter 10, a holding portion 16 for holding the beams
(piezoelectric exciters) b1 and b2 is formed on one side of the case c (on the left side in this
embodiment). Each beam constitutes a cantilever whose one end is held by the case c and the
other end is the free end 15.
The configuration of the piezoelectric exciter 10 is the same as that of the prior art, and the
detailed description is omitted.
In the bottom surface 10a of the piezoelectric exciter 10 of this cantilever structure, a portion
corresponding to the holding portion 16 side of the beams b1 and b2 which are piezoelectric
elements built in the piezoelectric exciter 10 is referred to as a first region P and on the free end
15 side. Let the corresponding part be a second area Q.
[0026]
The first area P is fixed to the vibrating panel 3 using a double-sided adhesive tape 11 having a
high elastic modulus as a high elastic fixing member.
On the other hand, the second region Q is connected to the vibration panel 3 using a low elastic
modulus flexible double-sided adhesive tape 12 having a low elastic sponge structure or the like.
As a result, the connection between the second region Q corresponding to the free end 15 side of
the bottom surface 10 a of the piezoelectric exciter 10 and the vibration panel 3 can be made
loose, and a panel type speaker having excellent acoustic characteristics is obtained. Can.
[0027]
That is, in this panel type speaker, the piezoelectric exciter 10 is connected and fixed to the
vibration panel 3 by the fixing layer formed by the double-sided adhesive tape 11 having a high
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elastic modulus, and the vibration from the piezoelectric type speaker is increased to the
vibration panel 3. The piezoelectric exciter 10 is connected to the vibration panel 3 by the
auxiliary layer formed of the double-sided adhesive tape 12 having a low elastic modulus and
flexibility, and the panel-type speaker is externally shocked. While making it difficult to separate
from the vibration panel even if it receives a vibration, the vibration of the vibration panel by the
piezoelectric exciter is not suppressed as much as possible.
[0028]
The adhesive layer in this case, that is, the double-sided adhesive tape 11 with high modulus of
elasticity, is preferably 80 percent or less, preferably 50 percent or less, of the entire bottom
surface 10 a of the piezoelectric exciter.
Moreover, in order to form an adhering layer, a thermosetting adhesive can be used instead of a
double-sided adhesive tape, for example.
[0029]
FIG. 5 shows experimental data showing the effect of the panel type speaker in the present
embodiment, and shows the reception characteristics measured by the measurement method
when used as a receiver of a telephone.
The dotted line is experimental data showing sound pressure level versus frequency
characteristics of the panel type speaker when the entire surface of the bottom surface 10a of
the piezoelectric exciter 10 is fixed to the vibrating panel 3 using the double-sided adhesive tape
11 having a normal high modulus of elasticity. The solid line is experimental data showing the
sound pressure level versus frequency characteristics of the panel type speaker of this
embodiment.
Compared to the case where the entire bottom surface 10a of the piezoelectric exciter 10 is
adhered using the normal double-sided adhesive tape 11, in the case of the panel type speaker of
the present embodiment, the sound pressure level of 500 Hz or less and 1 to 2 KHz increases.
The peak of the sound pressure level of 3 to 4 KHz is suppressed, and the sound pressure level
versus frequency characteristic is generally flat.
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[0030]
The acoustic characteristics of the panel-type speaker of this embodiment change in proportion
to the dimensions from one end 12 a to the other end 12 b of the low elastic modulus doublesided adhesive tape 12 shown in FIG. 1 (b).
Therefore, by changing the dimension from one end 12 a to the other end 12 b of the low elastic
modulus double-sided adhesive tape 12, it is possible to adjust and change the acoustic
characteristics.
That is, by changing the ratio between the area of the first region P and the area of the second
region Q, it is possible to adjust and change the acoustic characteristics.
Further, the acoustic characteristics can be improved by appropriately setting the dimensions
from one end 12 a to the other end 12 b of the double-sided adhesive tape 12.
[0031]
As described above, according to this embodiment, it is possible to improve the flatness of the
sound pressure level of the band of 300 Hz to 4 KHz, which is generally required for the
reception characteristic of the telephone.
In addition, since the entire bottom surface 10 a of the piezoelectric exciter 10 is connected to
the vibration panel, it does not come off due to an impact such as a drop of the device.
[0032]
Next, another embodiment of a panel type speaker according to the present invention is shown in
FIG.
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In the panel type speaker shown in FIG. 2, only the first region P on the bottom surface 10 a of
the piezoelectric exciter 10 is fixed to the vibration panel 3 using the double-sided adhesive tape
11 having high elastic modulus, and the second region Q vibrates. This is an example in which
the panel 3 and the panel 3 are not fixed.
The acoustic characteristics of the panel-type speaker in this example change in proportion to
the dimension from one end 11 a to the other end 11 b of the high modulus double-sided
adhesive tape 11. Therefore, by changing the dimension from one end 11 a to the other end 11 b
of the high elastic modulus double-sided adhesive tape 11, adjustment and change of acoustic
characteristics are possible. In addition, the acoustic characteristics can be improved by
appropriately setting the dimensions from one end 11 a to the other end 11 b of the high elastic
modulus double-sided adhesive tape 11.
[0033]
FIG. 3 is a cross-sectional view showing a third embodiment of a panel type speaker according to
the present invention. The present embodiment differs from the piezoelectric exciter 10 of the
first embodiment in the piezoelectric exciter 20 attached to the vibration panel 3.
[0034]
As shown in FIG. 3, in the piezoelectric exciter 20, a holding portion 26 for holding the beams B1
and B2 is formed in the vicinity of the center of the case, and the central portion of each beam is
held by the case. Both terminals are free ends 25 and 27. The configuration of the piezoelectric
exciter 20 is the same as that of the prior art, and the detailed description is omitted. On the
bottom surface 20a of the piezoelectric exciter 20, a portion corresponding to the holding
portion 26 side of the beams B1 and B2 which are piezoelectric elements built in the
piezoelectric exciter 20 is taken as a first region P and on the free ends 25 and 27 side The
corresponding portions are referred to as second regions Q and R, respectively.
[0035]
The first area P is fixed to the vibrating panel 3 using a double-sided adhesive tape 11 having a
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high elastic modulus as a high elastic fixing member. On the other hand, the second regions Q
and R are connected to the vibration panel 3 using soft low elastic double-sided adhesive tapes
12 and 13 having a low elastic sponge structure or the like. As a result, the connection between
the second regions Q and R on the bottom surface 20a of the piezoelectric exciter 20 and the
vibration panel 3 can be made gentle, and the sound pressure level versus frequency
characteristics as a whole are similar to the first embodiment. A flat panel speaker having
excellent acoustic characteristics can be obtained.
[0036]
The acoustic characteristics in the present embodiment vary depending on the dimensions of the
high modulus double-sided adhesive tape 11 and the dimensions of the low modulus doublesided adhesive tapes 12 and 13. Therefore, the acoustic characteristics can be adjusted or
changed by changing the dimensions from one end 12a to the other end 12b and from 13a to
the other end 13b of the low elastic modulus double-sided adhesive tapes 12, 13. Also, the
acoustic characteristics can be improved by appropriately setting the dimensions from one end
to the other end of the high elastic modulus double-sided adhesive tape 11.
[0037]
According to this embodiment, as in the first embodiment, it is possible to improve the flatness of
the sound pressure level of the band of 300 Hz to 4 KHz, which is generally required for the
telephone reception characteristics. Further, since the entire surface of the bottom surface 20a of
the piezoelectric exciter 20 is connected and held to the vibration panel by the double-sided
adhesive tapes 11, 12, 13, it does not come off due to an impact such as falling of the device.
[0038]
Another embodiment of a panel-type speaker according to the present invention is shown in FIG.
In the panel type speaker shown in FIG. 4, only the first region P on the bottom surface 20 a of
the piezoelectric exciter 20 is fixed to the vibrating panel 3 using the double-sided adhesive tape
11 having high elastic modulus, and the second region Q, R is an example in which the vibrating
panel 3 is not fixed. The acoustic characteristics of the panel-type speaker in this example change
in proportion to the dimension from one end 11 a to the other end 11 b of the high modulus
double-sided adhesive tape 11. Therefore, by changing the dimension from one end 11 a to the
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other end 11 b of the high elastic modulus double-sided adhesive tape 11, adjustment and
change of acoustic characteristics are possible. In addition, the acoustic characteristics can be
improved by appropriately setting the dimensions from one end 11 a to the other end 11 b of the
high elastic modulus double-sided adhesive tape 11.
[0039]
FIGS. 9A and 9B show modifications of the panel-type speaker shown in FIG. In this modification,
the exciter 10 is provided with a bracket 10 a. That is, the bracket 10 a extends parallel to the
vibrating panel 3 from the lower side edge of the rectangular case of the exciter 10 toward the
liquid crystal panel 2, and high elasticity is provided between the bottom of the bracket 10 a and
the vibrating panel 3. A fixing member 11 made of double-sided tape or the like is provided. That
is, in this modification, the fixing member 11 is provided as far as possible from the peripheral
portion 3a of the vibration panel 3 attached to the case of the mobile phone, whereby the exciter
10 transmits the vibration panel 3 via the fixing member 11 The panel vibrated by the vibration
is efficiently vibrated. For the same purpose, as shown in FIG. 9C, even when the exciter is not
provided with a bracket, it is preferable to provide the fixing member 11 along the side away
from the peripheral portion 3a of the vibrating panel 3.
[0040]
10 (a) and 10 (b) show another variation of the embodiment of FIG. That is, in this modification,
in addition to the fixing member 11, an additional fixing member 11c having high elasticity is
provided.
[0041]
FIG. 11 (a) shows still another modification of the embodiment of FIG. In this modification, a
fixing member 31 is provided between the case c of the exciter and the vibrating panel 3. That is,
this fixing member is made of a material of high elastic modulus (high elasticity), and extends
from the flat portion 31a toward the vibrating panel 3 a flat portion 31a fixed to the entire
bottom surface of the case c of the exciter It has first and second fixed portions 31 b and 31 c
welded to the vibration panel 3. The fixing member 31 is preferably formed of the same material
as the vibrating panel 3, for example, acrylic.
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[0042]
The modification of FIG.11 (b) and FIG. 11 (a) is shown. That is, in this modification, the first and
second fixed portions 31 b and 31 c are integrally formed on the case c of the exciter and welded
to the vibration panel 3.
[0043]
The structure of the panel type speaker in Example 1 of this invention is shown, FIG. 1 (a) is a
perspective view, FIG.1 (b) is BB sectional drawing in FIG. 1 (a). It is sectional drawing which
shows the other example of the panel type speaker in Example 1 of this invention. It is sectional
drawing which shows the panel type speaker in Example 2 of this invention. It is sectional
drawing which shows the other example of the panel type speaker in Example 2 of this invention.
It is experimental data which compares and shows the sound pressure level versus frequency
characteristic of the panel type speaker in Example 1 of this invention, and the panel type
speaker of conventional structure. It is a top view which shows the structure of the display part
of the conventional mobile telephone with a panel type speaker. It is a figure which shows the
example of the piezoelectric exciter of the box-shaped case structure mounted in the
conventional panel-type speaker, and is sectional drawing which shows the structure of a handheld vibration-type exciter. The structure of the conventional liquid crystal display with a panel
type speaker is shown, FIG. 8 (a) is a perspective view, FIG.8 (b) is AA sectional drawing in FIG. 8
(a). 9 (a) is a plan view of the panel-type speaker, FIG. 9 (b) is a side view, and FIG. 9 (c) is a
modification of FIG. 9 (a). FIG. FIG. 10 shows another modification of the panel type speaker
shown in FIG. 2, FIG. 10 (a) is a plan view of the panel type speaker, and FIG. 10 (b) is a side view.
11 (a) is a side view of still another modified example of the panel type speaker shown in FIG. 2
and a side view of a modified version of the panel type speaker of FIG. 11 (a).
Explanation of sign
[0044]
DESCRIPTION OF SYMBOLS 2 liquid crystal panel 3 vibration panel 10, 20 piezoelectric exciter
10a, 20a bottom face of piezoelectric exciter 11 high elastic double-sided adhesive tape (fixed
layer) 12, 13 low elastic double-sided adhesive tape (auxiliary layer) 16, 26 holding part 31 fixed
member P Region 1 (sticking region) Q, R Second region (remaining region)
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