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JP2003029761

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2003029761
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sounder incorporated in various mobile communication terminals and the like and used as a
ringing tone.
[0002]
2. Description of the Related Art The prior art will be described with reference to FIG. FIG. 3 is a
structural sectional view of a conventional sounder. According to the figure, 8 is a first plate in
which the center pole 7 is fitted, 3 is a ring-shaped magnet adhesively bonded to the upper
surface of the first plate 8, 4 is a second magnet disposed on the upper surface of the magnet 3 It
is a plate. A coil 6 is disposed at the center pole 7, and a magnetic circuit portion is formed by
the center pole 7, the first plate 8, the magnet 3, the second plate 4 and the coil 6.
[0003]
A resin frame 5 is integrally molded with the first plate 8. A diaphragm 2 is provided at the upper
part of the peripheral edge of the magnet 3. The diaphragm 2 is composed of a suspension 2c
made of a permalloy thin plate and a diaphragm 2d of permalloy.
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[0004]
Reference numeral 1 denotes a resonance cover coupled to the resin frame 5 so as to cover the
diaphragm 2.
[0005]
SUMMARY OF THE INVENTION In the above-mentioned conventional structure, the material of
the diaphragm 2 is composed of a suspension 2c made of a thin permalloy thin plate having high
permeability and a diaphragm 2d of permalloy to pass a magnetic flux. The performance has
good characteristics, but the large specific gravity on the other hand has a problem that the
acoustic conversion efficiency as the diaphragm tends to decrease, that is, the sound pressure
characteristic tends to decrease.
[0006]
An object of the present invention is to solve the problems of the conventional sounder and to
provide a sounder excellent in sound pressure characteristics.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to
claim 1 of the present invention is a first plate in which at least a center pole is implanted in the
center, and the center pole A coil disposed on the outer periphery of the ring, a substantially
ring-shaped magnet disposed on the outer periphery of the coil on the first plate, a second
toroidal plate disposed on the upper surface of the magnet, and a magnet disposed on the
magnet A sounder comprising a diaphragm which is coupled to cover the second plate and which
includes a suspension at an outer peripheral portion and a diaphragm at a central portion,
wherein the suspension at the outer peripheral portion of the diaphragm is from the diaphragm
at the central portion It is made of a material with a small specific gravity, and the weight
reduction of the diaphragm is achieved by arranging a material with a small specific gravity on
the suspension on the outer peripheral part of the diaphragm. More, the effect that attained the
sound pressure level increase of the resulting.
[0008]
According to a second aspect of the present invention, the diaphragm according to the first
aspect is constituted by a suspension of a thin plate made of stainless steel and a diaphragm
made of permalloy. The suspension of a thin plate made of stainless steel is By using this, the
weight and the rigidity can be improved, and the sound pressure level can be improved.
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2
[0009]
According to a third aspect of the present invention, the diaphragm according to the first aspect
is constituted by a thin sheet suspension made of titanium and a diaphragm made of permalloy.
By using this, it is possible to achieve weight reduction and to obtain an effect that the sound
pressure level can be improved without causing deterioration of the frequency characteristic.
[0010]
According to the fourth aspect of the present invention, the supporting portion is changed such
that the diaphragm supporting method according to the first aspect is performed from the upper
surface of the frame to the outer periphery of the magnet, so that the structure can be simplified.
An effect is obtained.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a sounder according to the
present invention will be described below with reference to FIG.
[0012]
In the description, the same parts as those in the prior art are given the same reference numerals
and explanations thereof will be simplified.
[0013]
Embodiment 1 FIG. 1 is a sectional view of an embodiment of a sounder according to the present
invention, which relates to claims 1 to 3. As shown in FIG.
[0014]
The difference between the prior art and the prior art will be described with reference to the
same figure. The specific gravity of the outer peripheral portion of the diaphragm 2 is made of a
material smaller than the specific gravity of the central portion. The sound pressure level can be
improved by reducing the weight of the diaphragm 2 by arranging a material having a small
specific gravity in 2a.
[0015]
Further, the diaphragm 2 is constituted by a stainless steel or titanium thin plate suspension 2a
and a permalloy diaphragm 2b, and the stainless steel or titanium thin plate suspension 2a is
used to reduce the weight. It is also possible to improve the sound pressure level without causing
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3
deterioration of the frequency characteristics.
[0016]
In this case, it is essential that the diaphragm 2b is a magnetic material such as permalloy.
[0017]
(Embodiment 2) FIG. 2 is a cross-sectional view of another embodiment of the sounder of the
present invention, and relates to claim 4.
The difference between the first embodiment and the first embodiment will be described with
reference to FIG. 1. The method of supporting the diaphragm 2 is performed on the outer
periphery of the magnet 3, thereby simplifying the structure and enabling cost reduction. It is.
[0018]
As described above, according to the sounder of the present invention, the suspension material
on the outer peripheral portion of the diaphragm is made of a material having a specific gravity
smaller than that of the central diaphragm, and the weight of the diaphragm is reduced. Can
contribute to the improvement of the sound pressure level.
[0019]
Brief description of the drawings
[0020]
1 is a cross-sectional view of one embodiment of the sounder of the present invention
[0021]
2 is a cross-sectional view of another embodiment of the sounder of the present invention
[0022]
Fig. 3 Cross section of the conventional sounder
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[0023]
Explanation of sign
[0024]
Reference Signs List 1 resonance cover 2 diaphragm 2a 2c suspension 2b 2d diaphragm 3
magnet 4 second plate 5 frame 6 coil 7 center pole 8 first plate
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