close

Вход

Забыли?

вход по аккаунту

JP2003029762

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JP2003029762
[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, reference numeral 8
is a first plate into which the center pole 7 is fitted. Reference numeral 3 denotes a ring-shaped
magnet adhesively bonded to the upper surface of the first plate 8. Reference numeral 4 denotes
a second plate disposed on the upper surface of the magnet 3, and 6 denotes a coil disposed on
the center pole 7. 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.
03-05-2019
1
[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 solve the above-mentioned problems, the invention
according to claim 1 of the present invention is characterized in that a first plate having at least a
center pole 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 doughnut-shaped 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 The diaphragm is made of a material
with low permeability, and by arranging a material with low permeability to the suspension on
the outer peripheral part of the diaphragm By the part of the diaphragm concentrate magnetic
flux, thereby improving the sound pressure level.
[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
material, a material having a low permeability can be disposed in the suspension, and the sound
pressure level can be improved by concentrating the magnetic flux on the diaphragm at the
03-05-2019
2
center of the diaphragm.
[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 material, a material having a low permeability can be disposed in the suspension,
and the sound pressure level can be improved by concentrating the magnetic flux on the
diaphragm at the center of the diaphragm.
[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 top
surface of the frame to the outer periphery of the magnet, thereby simplifying the structure. it
can.
[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 in the prior art are given the same reference numerals to
simplify the explanation.
[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 FIG. 1.
The permeability of the outer peripheral portion of the diaphragm 2 is made of a material
smaller than the permeability of the central portion. That is, by arranging a material having a
small permeability to the suspension 2a, the magnetic flux can be concentrated on the diaphragm
2b at the central portion, and the sound pressure level can be improved.
03-05-2019
3
[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 obtain permeability. It is also possible to improve the sound pressure level without
causing the deterioration of the frequency characteristic by reducing the flux density and
concentrating the magnetic flux on the diaphragm 2b at the central portion.
[0016]
(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.
[0017]
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 smaller
permeability than the diaphragm material on the central portion, and the magnetic flux can be
The concentration on the diaphragm can contribute to the improvement of the sound pressure
level.
[0018]
Brief description of the drawings
[0019]
1 is a cross-sectional view of one embodiment of the sounder of the present invention
[0020]
2 is a cross-sectional view of another embodiment of the sounder of the present invention
[0021]
03-05-2019
4
Fig. 3 Cross section of the conventional sounder
[0022]
Explanation of sign
[0023]
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
03-05-2019
5
1/--страниц
Пожаловаться на содержимое документа