JP2001054189

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DESCRIPTION JP2001054189
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
thin speaker, and more particularly to a thin speaker having extremely excellent elasticity and
omitting a damper.
[0002]
2. Description of the Related Art A conventional speaker as shown in FIG. 1 comprises a case 10,
a diaphragm, a yoke 30, a coil 40, a magnet 50, a washer 60, a front electrode plate 70 and a
damper 80. The annular surface 201 of the surface layer of the vibrating membrane has a
generally concave shape inward, and has an effect of emitting and reproducing sound by
repeatedly expanding and contracting. The damper 80 is joined to the vibrating membrane, and
when the vibrating membrane extends outward, the damper 80 holds the vibrating membrane
repeatedly and vibrates, so the damper 80 is an important member that is indispensable.
[0003]
However, the above-described damper has an annular crease on the surface, the circumferential
wall is attached to the inside of the case 10, and the central portion is joined to the vibrating film,
so that the magnitude of the vibration is large. The assembly of the damper is extremely
laborious and inconvenient because it provides a force to pull back the vibrating membrane
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accordingly. Therefore, it is difficult to reduce the manufacturing cost of the speaker, and the
speaker takes up a large space by mounting the damper, which causes space, but the volume is
weak and it is not possible to obtain clean and clean sound quality.
[0004]
Therefore, the object of the present invention is to make the vibrating film very elastic, save the
damper, eliminate the space loss and reduce the thickness, and simplify the members and reduce
the cost, and improve the volume and sound quality. To provide a thin speaker.
[0005]
SUMMARY OF THE INVENTION A thin speaker according to the present invention for solving the
above-mentioned problems comprises a case, a diaphragm, a yoke, a coil, a magnet, a washer and
a front electrode plate. The annular surface of the surface layer projects outwardly in the
opposite direction to the prior art.
This reverse structure significantly improves the elasticity of the vibrating membrane, saves the
installation of the damper, eliminates the space waste and reduces the thickness of the speaker,
and further simplifies the components and reduces the cost. To increase the volume and improve
the sound quality.
[0006]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. As shown in FIGS. 2 to 4, the thin speaker
according to one embodiment of the present invention includes a case 1, a diaphragm 2, a yoke
3, a coil 4, a magnet 5, a washer 6 and a case 1. And a front electrode plate 7 fixed to a selected
position. The case 1 is an annular shell made of an insulating material and has an annular hole
11 at the center, two notches 12 formed on one side of the annular wall, and the places where
the notches 12 are formed A front electrode plate 7 is provided at the bottom corresponding to
the above, and many holes 13 are formed in the annular surface of the case so as to surround the
front electrode plate 7.
[0007]
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The vibrating membrane 2 has a convex ring portion 21 at its annular edge, and the size of the
convex ring portion 21 is such that it can be stuck to the case 1, and the vibrating membrane 2
and the case 1 Between the yoke 3, the magnet 5, the washer 6 and the coil 4 are provided. The
annular surface 22 of the surface layer of the vibrating membrane 2 protrudes outward, the
central hole 23 of the vibrating membrane 2 is intimately joined to the central film 24, and the
annular surface 22 of the surface layer of the vibrating membrane 2 It has a structure just in the
opposite direction. By this, the elasticity of the vibrating membrane 2 can be greatly improved,
and the installation of the damper can be avoided, and the number of members and the assembly
procedure can be reduced.
[0008]
The yoke 3 has a circular lid shape, and is attached to the annular hole 11 of the case 1, and the
magnet 5, the washer 6 and the coil 4 are attached in order inside. The coil 4 is formed by
winding an electric wire around a winding paper 41 and is attached to the outside of the magnet
5 and the washer 6, and the winding paper 41 is held between the yoke 3 and the central
membrane 24 and two electric wires 42, 43 Are respectively welded to the front electrode plate
7 through the two notches 12 of the case 1.
[0009]
In the thin loudspeaker formed by the above-described members, since the annular surface 22 of
the surface layer of the vibrating membrane 2 protrudes outward, the elasticity of the vibrating
membrane 2 is greatly improved. Therefore, the installation of the damper can be omitted, and
simplification and cost reduction of members can be achieved. As a result of actually testing the
present example having the diaphragm 2 projecting in the opposite direction to the conventional
one, it was found that the thin speaker of the present example has a remarkable effect of
enhancing the sound volume and improving the sound quality. As shown in FIG. 5, since the
fairly stable dB value is obtained between 300 Hz and 20 kHz, the thin speaker of this
embodiment has definitely a larger flat frequency width, and the improvement of the specific
result is extremely obvious. It is easy to manufacture and assemble, and the cost can be reduced.
[0010]
The thin speaker of the present invention comprises a case, a diaphragm, a yoke, a coil, a magnet,
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a washer, and a front electrode plate, and the annular surface of the diaphragm surface layer is
outward as opposed to the prior art. Since the elasticity of the diaphragm is greatly improved by
this structure in the opposite direction from the conventional structure, the installation of the
damper can be omitted, and the space of the speaker can be reduced, and the thickness of the
speaker can be reduced. The components are simplified and the manufacturing cost is reduced,
and the sound volume and sound quality are improved.
[0011]
Brief description of the drawings
[0012]
1 is a cross-sectional view showing a conventional speaker.
[0013]
2 is a cross-sectional view showing a thin speaker according to an embodiment of the present
invention.
[0014]
3 is an exploded perspective view showing a thin speaker according to an embodiment of the
present invention.
[0015]
4 is a perspective view showing a thin speaker according to an embodiment of the present
invention.
[0016]
5 is a frequency response curve diagram of a thin speaker according to an embodiment of the
present invention.
[0017]
Explanation of sign
[0018]
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DESCRIPTION OF SYMBOLS 1 Case 2 diaphragm 3 yoke 4 coil 5 magnet 6 washer 7 front pole
plate 11 ring hole 12 notch 13 hole 21 convex ring portion 22 annular surface 23 center hole
24 center film 42, 43 electric wire
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