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JP2003018686

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DESCRIPTION JP2003018686
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly to a small speaker suitable for application to small electronic
devices such as portable telephones.
[0002]
2. Description of the Related Art A speaker installed in a portable telephone or the like is
required to have high performance and small size. Japanese Patent Application Laid-Open No.
11-331969, which relates to the prior application of the present applicant, discloses a speaker
whose size has been reduced by utilizing a display panel as a diaphragm. Further, Japanese
Patent Application Laid-Open No. 2000-334378 discloses a technique for achieving
miniaturization by forming a spiral damper that also serves as a diaphragm inside a magnetic
circuit.
[0003]
SUMMARY OF THE INVENTION In the speaker according to the prior application of the present
applicant, the yoke of the speaker is fixed to the display panel which doubles as a diaphragm, so
that the efficiency of the electric / acoustic conversion is improved. It is not always enough.
Further, in the speaker disclosed in Japanese Patent Application Laid-Open No. 2000-334378,
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since the diaphragm for generating sound also serves as a damper, there is a problem in the
electric / acoustic conversion efficiency as well. Therefore, one object of the present invention is
to provide a small-sized and high-efficiency electric / acoustic conversion small speaker.
[0004]
SUMMARY OF THE INVENTION A speaker according to the present invention for solving the
above-mentioned problems of the prior art comprises a magnetic circuit comprising a yoke, a
permanent magnet and a plate, and a space between the yoke and the plate of the magnetic
circuit. And a sub-panel for holding the voice coil. The sub-panel is fixed to a diaphragm that
doubles as a surface protection plate of the display device, and the plate of the magnetic circuit
and the sub-panel are connected by a damper, resulting in a small size and a small size with high
electric / acoustic conversion efficiency. It is configured to realize a speaker.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION According to a preferred embodiment of the
present invention, a damper is fitted in a recess or an opening formed in a plate to increase its
thickness and function as a damper. It is configured to boost.
[0006]
According to another preferred embodiment of the present invention, the electric / acoustic
conversion efficiency is further increased by fixing the yoke to the frame surrounding the surface
protection plate, not to the surface protection plate, with a holder interposed. Is configured to
realize a high-powered, small speaker.
[0007]
According to still another preferred embodiment of the present invention, the surface protection
plate of the display device is supported by a frame surrounding the surface protection plate via a
soft elastic body, so that It is configured to perform efficient excitation.
[0008]
According to still another preferred embodiment of the present invention, by making the
magnetic circuit and the voice coil rectangular, high space utilization efficiency and simplification
and cost reduction of the structure can be realized. It is configured.
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[0009]
According to still another preferred embodiment of the present invention, by forming the voice
coil into a bobbin-less structure, the magnetic flux density is improved, and a large sound output
and a high electric / acoustic conversion efficiency are realized. Is configured.
[0010]
According to yet another preferred embodiment of the present invention, the display device is
configured to be a liquid crystal display device of a portable telephone.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a plan view (A), a side
perspective view (B) and a partial enlarged cross-sectional view of a speaker 10 showing the
configuration of a speaker according to one embodiment of the present invention (C).
The mobile phone P includes a key input unit K and a display unit D.
The display section D on which a message is displayed is constituted by a liquid crystal display
device, and a hard surface protection plate S made of transparent glass or plastic is provided to
protect the liquid crystal display device.
This hard surface protection plate S is used as a diaphragm of the speaker of this embodiment,
and its end is held while interposing a soft elastic body U in the peripheral portion of a case
made of a hard material such as resin. It is done.
[0012]
As shown in the partially enlarged cross-sectional view (C), the speaker 10 is mounted on the
periphery of the case of the portable telephone P through a substantially L-shaped fixture 16
made of a hard material such as resin or metal. It is fixed.
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The main body portion of the speaker excluding the mounting fixture 16 is further enlarged and
shown in the plan view (A) and the cross-sectional view (B) of FIG.
The body portion of the speaker includes a yoke (outer yoke) 11, a magnet 12, a plate (inner
yoke) 13, a voice coil 14, a sub panel 15, and a damper 16.
[0013]
The magnetic circuit formed by the yoke 11, the magnet 12 and the plate 13 has a rectangular
shape.
The voice coil 14 disposed in the space formed between the yoke 11 and the plate 13 has a
rectangular shape in accordance with the shape of the space. By using the rectangular voice coil
14 in this manner, the voice coil can be used in a rectangular space formed at the end of the
rectangular surface protection plate S, which also serves as a diaphragm, with high space
utilization efficiency. It can be arranged by
[0014]
As a result, a simple and inexpensive structure can be realized as compared to the case where a
plurality of circular voice coils are arranged side by side in the same rectangular space.
Furthermore, this voice coil 14 reduces the size of the air gap by the thickness of the bobbin by
adopting a bobbin-less voice coil structure that does not use a winding frame. As a result, high
magnetic flux density can be realized, and despite the small size, sufficient sound volume and
high electric / acoustic conversion efficiency can be realized.
[0015]
The upper end of the voice coil 14 is directly fixed to the back surface of the sub panel 15
through an adhesive layer. The sub panel 15 is connected to the plate 13 via the damper 16.
That is, the top surface of the damper 16 is adhesively fixed to the bottom surface of the sub
panel 15, and the bottom of the damper 16 is fitted and bonded in the opening formed in the
plate 13. The damper 16 is made of a relatively soft elastic material such as urethane foam, and
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mainly damps and suppresses unnecessary low frequency components of the vibration excited on
the sub panel 15.
[0016]
As the damper 16, for example, it is preferable to use a urethane foam sold by Inoac Corporation
under the trade name "POLON" in that it has little compressive residual strain and is excellent in
heat resistance. As described above, when the thickness of the damper 16 is increased by
forming the opening in the plate 13, the function as the damper is improved. The thickness of the
damper can also be increased by forming a recessed groove instead of the opening.
[0017]
The sub panel 15 has a holding mechanism for directly holding the voice coil 14 without the
interposition of a bobbin, and the surface of the display portion D of the portable telephone P
which uses the vibration generated by the voice coil 14 as a diaphragm of the speaker. It
combines with the function of the vibration transmission mechanism transmitted to the
protective plate S. Further, as shown in FIG. 3, the sub panel 15 also has a function of a terminal
board on which terminals (not shown) of lead wires connected to the voice coil 14 are installed at
the right end portion.
[0018]
FIG. 3 is a plan view (A) and a cross-sectional view (B) showing the structure of a loudspeaker
according to another embodiment of the present invention. This speaker is also fixed to the
mobile phone shown in FIG. 1 via the substantially L-shaped fixture inside the lower end portion
of the display unit of the mobile phone, similarly to the one shown in FIG. Accordingly, the same
components as those shown in FIGS. 1 and 2 are given the same reference numerals.
[0019]
The difference between this embodiment and the embodiment of FIG. 1 is that the damper 16
has a flat central portion 16a held in the central portion of the plate 13, and the central portion
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16a at the inner peripheral portion of the sub-panel 15. And a corrugated connecting portion
16b connected to the The damper 16 is preferably integrally formed with the sub panel 15, and
as a material thereof, an elastomer AR (product of Aron Kasei Co., Ltd.) or the like which has
appropriate elasticity and is excellent in temperature change and weather resistance is suitable. A
cylindrical protrusion formed on the back surface of the central portion 16 a is fitted in a circular
recess formed on the surface of the plate 13 and is bonded thereto, whereby the damper 16 is
firmly connected to the plate 13.
[0020]
The case of attaching the speaker of the present invention to a portable telephone has been
described above. However, the speaker of the present invention can be applied not only to mobile
phones but also to other appropriate small-sized portable electronic devices or appropriate
electronic devices for stationary.
[0021]
As described above in detail, in the loudspeaker according to the present invention, the sub-panel
is fixed to the diaphragm also serving as the surface protection plate of the display device, and
between the plate of the magnetic circuit and the sub-panel Is connected by the damper, so that a
small-sized speaker with high sound generation efficiency can be realized.
[0022]
Further, according to a preferred embodiment of the present invention, since the yoke is fixed
not to the surface protection plate but to the frame surrounding the yoke with a holder
interposed, the sound generation efficiency is further enhanced. Small speaker is realized.
[0023]
According to another preferred embodiment of the present invention, since the surface
protection plate of the display device is supported by the frame surrounding the surface
protection plate through the soft elastic body, the diaphragm Enables efficient excitation of
[0024]
According to yet another preferred embodiment of the present invention, the magnetic circuit
and the voice coil are formed in a rectangular shape to improve space utilization efficiency, and
the voice coil is formed in a bobbinless structure to improve the magnetic flux density. Because
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of the configuration, simplification and cost reduction of the structure, high output and high
conversion efficiency can be realized.
[0025]
Brief description of the drawings
[0026]
1 is a diagram showing the configuration of the speaker according to an embodiment of the
present invention, together with the configuration of a mobile phone in which the speaker is
installed.
[0027]
2 is a plan view (A) and a sectional view (B) showing an enlarged main body portion of the
speaker of the embodiment of FIG.
[0028]
3 is a plan view (A) and a sectional view (B) showing the configuration of the main body portion
of the speaker according to another embodiment of the present invention.
[0029]
Explanation of sign
[0030]
Reference Signs List 10 speaker 11 yoke 12 magnet 13 plate 14 voice coil 15 sub panel 16
damper P mobile phone D display portion S of mobile phone display protective plate of display of
mobile phone (also serving as diaphragm of speaker) K key input portion of mobile phone
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