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JPS6193798

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DESCRIPTION JPS6193798
[0001]
TECHNICAL FIELD The present invention relates to a speaker used for, for example, a telephone,
an acoustic coupler device, and the like. Conventional structure and its problems Fig. 1 is a crosssectional view showing the structure of a conventional speaker. 1 is a baffle plate, 2 is a
diaphragm, 3 is a voice coil, 4 is a frame, 5 U) soft plate, 6 Is a magnet and 7 is a plate with a
center ball. A top plate 5, a magnet 6, and a plate 7 with poles are combined to form a magnetic
circuit 9 having a concentric magnetic air gap 8 and coupled to the inside of the frame 4 molded
with resin or the like to constitute a housing assembly. Ru. Further, a vibration system in which
the voice coil 3 is adhered to the diaphragm 2 formed of a resin film is constituted, the
peripheral portion of the diaphragm 2 of the vibration system is adhered to the periphery of the
frame 4 of the housing assembly, and the diaphragm A baffle plate 1 formed of a resin or metal
having an air vent is disposed on the front face of 2 and the baffle plate 1 and a frame 4 are
bonded to constitute a speaker. In the above speaker configuration, the housing assembly to the
standup are configured such that the annular adhesive surface of the frame 4 with the
diaphragm 2 and the magnetic gap 8 are concentric, and the frame 4 of the adhesive surface of
the diaphragm 2 The outer wall dimensions are such that the outer diameter of the diaphragm 2
is fitted. On the other hand, the vibration system is configured by bonding the voice coil 3 so as
to be concentric with the inside of the outer diameter of the diaphragm 2. The voice coil 3 is held
substantially at the center of the magnetic gap 8 by fitting the housing assembly and the outer
diameter of the vibration system to the outer wall of the bonding surface of the diaphragm 2 of
the frame 4 and the diaphragm 2. There is. However, in the above-described conventional
configuration, since the outer periphery of the thin and flexible diaphragm 2 is used as a guide,
deformation and eccentricity of the peripheral portion of the diaphragm 2 are easily generated
by stress applied at the time of bonding with the frame 4 3 can not be disposed substantially at
the center of the magnetic gap 8, which is a main cause of abnormal sound defects due to the
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gap grinding of the voice coil 3. SUMMARY OF THE INVENTION The object of the present
invention is to solve the above-mentioned conventional problems, and to provide a speaker
capable of reducing abnormal sound defects of the speaker. SUMMARY OF THE INVENTION In
order to achieve the above object, according to the present invention, the baffle plate and the
diaphragm are adhered to each other with the protrusion on the outer periphery or concentric
circle of the baffle plate as the guide portion itself, and the diaphragm and the voice coil. The
vibration system is assembled to a noise-free assembly having a peripheral portion to be bonded
to form a vibration system and fitted with the guide portion of the baffle plate, and forming a
magnetic gap of a magnetic circuit concentrically with the peripheral portion. Due to the fitted
and bonded structure, when the vibration system and the housing assembly are combined, the
eccentricity of the fitting is reduced, the stress applied to the diaphragm is reduced, the
deformation of the diaphragm is completely eliminated, and the generation of defects is reduced.
It is said that.
Description of the Embodiments An embodiment of the present invention will be described below
with reference to FIG. FIG. 2 is a cross-sectional view of a speaker according to an embodiment of
the present invention, 11 is a baffle plate, 12 is a diaphragm, 13 is a voice coil, 14 is a frame, 16
is a top plate, 16 is a magnet, 17 is It is a plate with a center pole. The top plate 16, the magnet
16, and the plate 17 with balls are combined to form a magnetic circuit 19 having a concentric
magnetic air gap 18, which is coupled to the inside of the frame 14 formed of resin or the like.
Configured Further, the diaphragm 12 formed of a resin film is bonded on a downwardly
projecting portion 20 formed concentrically with the outer periphery of the baffle plate 11
formed by molding a resin, and the diaphragm 12 and the voice coil 13 are further formed.
Bonding forms a vibration system. By fitting and bonding the outer periphery of the baffle plate
11 and the peripheral portion of the frame 140, a vibration system is incorporated in the housing
assembly to constitute a speaker. In the above-described speaker configuration, the housing
assembly is configured such that the magnetic gap 18 is concentric with the fitting surface of the
frame 14 with the baffle plate 11. On the other hand, the diaphragm 12 has a fitting gap of 0.1
to 0.06 inch with the concentric convex portion 20 of the baffle plate 11 as a guide and is
bonded to the baffle plate 12, and the voice coil 13 is made of the baffle plate 13. It is bonded to
the diaphragm 12 concentrically with the outer periphery to form a vibration system. れている。
The voice coil 13 is held substantially at the center of the magnetic gap 18 by incorporating the
vibration system into the housing assembly by fitting the outer periphery of the baffle plate 11
and the peripheral portion of the frame 14. With this configuration, when the housing assembly
and the vibration system are combined, almost no stress is applied to the diaphragm 12 and no
deformation of the periphery of the diaphragm 12 occurs, and the voice coil 13 is not influenced
by the eccentricity of the diaphragm 12 The voice coil can be bonded concentrically with the
outer periphery of the baffle plate 11, and furthermore, the baffle plate 11 and the frame 14 can
be a relatively hard part such as a resin molded product, and a space of about 0.03 gates can be
realized. 13 can be placed in the magnetic air gap 18 with very little eccentricity. As described
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above, according to the present invention, the diaphragm is adhered to the baffle plate formed of
resin or the like, and the protrusion on the concentric circle of the baffle plate or the outer
periphery is the guide of the concentric circle, and the diaphragm and voice coil Because it is
made of hard parts such as baffle plates and flexible molded products, it is possible to reduce the
eccentricity between the deformation of diaphragm and voice coil and the magnetic gap
extremely, and the abnormal sound due to the poor sound quality in speaker production and gap
grinding It reduces the occurrence and makes the quality extremely stable.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing a conventional speaker, and FIG. 2 is a cross-sectional
view showing the structure of one embodiment of the speaker of the present invention.
11 · · · · · · · · baffle plate, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · top plate, 16 ......
magnet, 17 ...... center pole with a plate, 18 ... ... magnetic gap, 19 ..... magnetic circuit, 20 ......
protrusion. Name of Agent Attorney Nakao Toshio and 1 other person 吟 Fig. 14 / '/
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