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JP2007027922

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DESCRIPTION JP2007027922
PROBLEM TO BE SOLVED: To solve the problem is that, in an apparatus using a panel type
speaker and a panel type receiver, when trying to increase the sound pressure, the
waterproofness of the apparatus can not be maintained. SOLUTION: In a mounting structure of
an exciter for a panel type speaker and an exciter for a panel type receiver, a casing of an
apparatus and a panel which is a diaphragm of a speaker are supported by using a waterproof
film. Moreover, the housing | casing which protects this film was provided on the said waterproof
film. Furthermore, a casing for protecting the waterproof film is a sub-frame provided separately
from the casing of the device. [Selected figure] Figure 1
Mounting structure for exciter for panel type speaker and exciter for panel type receiver
[0001]
The present invention relates to an exciter for a panel-type speaker and a mounting structure of
the exciter for a panel-type receiver, in particular, a waterproof mounting structure in a small
portable device such as a mobile phone.
[0002]
In recent small mobile devices such as mobile phones, many panel speakers or panel receivers
use a transparent panel provided for protecting a display device such as a liquid crystal device as
a panel that is a diaphragm of a speaker or receiver. It has been used.
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1
With regard to devices using such panel type speakers or panel type receivers, the focus has
been on measures against impact. In order to avoid destruction of the exciter (consistent with the
actuator) due to impact, a proposal has been made such that an impact absorbing material is
disposed on both plate surfaces of the piezoelectric diaphragm (see, for example, Patent
Document 1).
[0003]
However, in a device using a panel type speaker or a panel type receiver, in addition to such an
impact problem, it is difficult to satisfy both the sound pressure and waterproof characteristics
depending on the mounting structure of the exciter. was there. This problem will be described
with reference to FIGS. FIG. 2 is a view of a cellular phone using a panel type speaker or a panel
type receiver, and FIG. 2 (a) is a plan view of the cellular phone 30 using a panel type speaker or
a panel type receiver. There is provided a panel 20 which doubles as a diaphragm of a speaker or
panel receiver. The panel 20 is made of, for example, a transparent material such as an acrylic
material so that the liquid crystal display device 32 provided at the rear of the panel can be seen
through, and the exciter 22 is a liquid crystal display at the rear of the panel Mounted above the
device 32.
[0004]
2B is a cross-sectional view taken along the line A-A 'of FIG. 2A. The panel 20 is supported by the
housing 18 by the suspension 36 as a support member, and the liquid crystal display 32 is a
panel with a gasket 34 such as urethane foam. It is supported by Further, an exciter 22 is
attached to the panel 20 to vibrate the panel 20 to generate a sound. The problem is the
suspension 36. This problem will be described with reference to FIG. 3 which is a conventional
example of a magnified view of a portion B in FIG. 2 (b).
[0005]
In FIG. 3, a suspension 36 is composed of a continuous foam 26, a substrate 24 such as PET
sandwiching the continuous foam 26, and an adhesive 12 or 16 such as acrylic. When the
suspension 36 is made of a hard material such as an independent foam, the panel 20 is rigidly
supported by the housing 18, and the vibration of the panel 20 is inhibited to lower the sound
pressure. Therefore, it is desirable to make the suspension 36 a soft material such as continuous
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2
foam which does not inhibit the vibration of the panel 20. However, since the continuous foam
has a structure in which a series of cells are connected, it does not have a waterproof structure.
Therefore, the moisture shown by the line 28 in FIG. 3 passes through the continuous foam body
26 from the gap between the case 18 and the panel 20 and enters the inside of the case.
Moisture entering through the side surfaces of the suspension 36 may cause water droplets or
fog on the internal liquid crystal display or panel, and may adversely affect other electronic
components such as an exciter. As described above, in the conventional mounting structure of
the panel-type speaker exciter and the panel-type receiver exciter, there is a problem that if the
sound pressure is increased, the waterproofness of the device can not be maintained.
[0006]
Japanese Patent Application Publication No. 2004-104327
[0007]
The problem to be solved is that, in an apparatus using a panel-type speaker and a panel-type
receiver, if the sound pressure is increased, the waterproofness of the apparatus can not be
maintained.
[0008]
The mounting structure of the exciter for panel type speaker and the exciter for panel type
receiver of the present invention is characterized in that the casing of the device and the panel
which is the diaphragm of the speaker and the receiver are supported using a waterproof film.
[0009]
Further, the mounting structure of the exciter for panel type speaker and the exciter for panel
type receiver according to the present invention is characterized in that a housing for protecting
the film is provided on the waterproof film.
[0010]
Further, the mounting structure of the exciter for a panel type speaker and the exciter for a panel
type receiver according to the present invention is characterized in that the casing for protecting
the waterproof film is a sub-frame provided separately from the casing of the device. .
[0011]
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According to the mounting structure of the exciter for a panel type speaker and the exciter for a
panel type receiver of the present invention, since the film material is waterproofed, it is possible
to prevent the entry of moisture into the inside of the housing and to support the panel softly.
Therefore, the vibration suppression of the panel can be minimized, and a large sound pressure
can be obtained.
In addition, since the frequency characteristics can be selectively adjusted by selecting the
material, thickness, and shape of the film, the degree of freedom in design can be increased.
[0012]
In the mounting structure of the exciter for panel type speaker and the exciter for panel type
receiver, the casing of the device and the panel which is the diaphragm of the speaker were
supported using a waterproof film.
Moreover, the housing | casing which protects this film was provided on the said waterproof film.
Furthermore, a casing for protecting the waterproof film is a sub-frame provided separately from
the casing of the device.
[0013]
FIG. 1 is a partial cross-sectional view of an embodiment of a mounting structure for a panel type
speaker exciter and a panel type receiver exciter according to the present invention.
Similar to FIG. 3, FIG. 1 is an enlarged view of a portion B of a mobile phone using the panel type
speaker or panel type receiver shown in FIG.
In FIG. 1, a panel 20 is supported by a casing 18 by a waterproof film 14 and adhesive materials
12 and 16 provided on both sides thereof, and an exciter 22 is attached to the panel 20 to
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vibrate the panel 20 to generate sound. I am doing it. The waterproof film 14 is provided so as to
cover all four sides of the panel 20. In addition, a housing 10 for protecting the film is provided
on the waterproof film 14, and the housing 10 is a sub-frame provided separately from the
housing 18 of the device 30, and the sub-frame 10 is a device It is fixed to a housing 18 of 30 via
a waterproof film 14.
[0014]
As described above, in the mounting structure of the present invention, the panel 10 is supported
by the waterproof film 14 on the housing 18. Therefore, the moisture shown by the line 28 in
FIG. 1 tries to enter from the gap between the sub-frame 10 and the panel 20 but is not blocked
by the waterproof film 14 and does not enter the inside of the housing 18 The possibility of the
part being adversely affected by moisture is eliminated. In addition, since the panel 20 is softly
supported by the casing 18 with a soft material such as the waterproof film 14, vibration
suppression is extremely reduced, and a large sound pressure can be obtained. Here, the
waterproof film 14 may be waterproof, and is not limited to general materials such as PI, PET, PC
and the like. Although a waterproof film having a thickness of about 0.18 mm is generally used
as the waterproof film 14, in the present invention, for example, a film having a thickness of 0.05
mm to 0.5 mm may be used since waterproofing and soft support may be realized. In the range,
the thickness can be selected. When the mass of the panel is large, it is also preferable to select a
special thickness such as 0.25 mm to 0.5 mm thick. Similarly, the material, shape, and the like of
the waterproof film 14 can be selected, and each element can be selected in accordance with the
required characteristics such as frequency characteristics, for example, and the degree of
freedom in design can be increased. In addition, it is well known that the portable panel type
speaker using the exciter can be applied to the panel type receiver with the same structure by
performing electrical processing, and the exciter described in this specification is also applicable
to the panel type speaker It is premised that it can also be applied to panel type receivers.
[0015]
Furthermore, since the sub-frame 10 for protecting the film is provided on the waterproof film
14, mechanical damage of the waterproof film 14 can be prevented. Furthermore, by making the
sub-frame 10 separate from the case 18 of the device, there is also a practical effect that the case
18 can be manufactured using a mold.
[0016]
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The present invention is particularly effective for small portable devices such as mobile phones,
but it can also be applied to medium-sized PDAs and personal computers according to the
selection of films.
[0017]
It is a fragmentary sectional view of the example of the mounting structure of the exciter for
panel type speakers and the exciter for panel type receivers by this invention.
FIG. 1 is a diagram of a mobile phone using a panel type speaker or a panel type receiver. It is a
conventional example of the enlarged view of the B section of FIG.2 (b).
Explanation of sign
[0018]
30 Panel-type speaker or equipment using a panel-type receiver 18 Equipment housing 20 Panel
14 Waterproof film 10 Housing for protecting film, subframe 22 Exciter
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