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DESCRIPTION JPS6014599

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DESCRIPTION JPS6014599
[0001]
The present invention relates to the structure and fixing method of a diaphragm of a concave flat
speaker for high-pitched sound reproduction. Heretofore, this type of high-pitched concave flat
speaker has been shown in FIG. In the figure, 1 is a pole piece, 2 is a magne-soto, 3 is a plate
facing the pole piece 1 and arranged with a fixed air gap, and the ball beast magnet 2 and plate 3
are fixed by an adhesive or the like so as not to move each other It is fixed. Δ: voice coil disposed
in the air gap, 5 is a flat concave metal foil diaphragm press-bonded to the upper end of the voice
coil 4 with an adhesive, 6 is a frame for clamping the outer peripheral portion of the diaphragm
5 7, 8 are spacers for clamping the diaphragm 5 with the frame 6 more completely, and 9 is a
fixing screw for fixing the frame 6. Next, the operation will be described. In the air gap portion
formed by the pole piece 1 and the plate 3, the magnetic flux generated from the magnet 2 flows,
and the Teoli maintains a constant magnetic flux density. When an alternating current flows
through the electric wire 4a which is wound around the voice coil 4 accommodated therein, a
force in the vertical direction is generated in the figure in accordance with the left-hand rule of
framing. The force is transmitted to the diaphragm 5 because the upper end of the voice coil 4
and the diaphragm 5 are fixed by the adhesive. The outer periphery of the diaphragm 5 is
clamped so as to be attached to the plate 3 by the frame 6 and the spacers 7 and 8. Therefore,
the force transmitted to the diaphragm 5 is the fulcrum of the clamp portion and the upper and
lower in FIG. The air on the front is vibrated and emitted as a sound. Since the conventional highrecessity concave flat type speaker is configured as described above, the outer peripheral part of
the diaphragm 5 is completely clamped on the plate 3 by the frame 6 through the spacers 7 and
8 and so on. Of the thickness of the spacers 7 and 8 and of the hardness, and the dimensions in
the height direction of the notches for housing the spacers 7 and 8 provided on the frame 6 and
the diaphragm 5 The force to clamp the outer periphery of the diaphragm 5 becomes
nonuniform due to the presence of bulk and unevenness of smoothness of the flat portion facing
12-04-2019
1
the diaphragm outer peripheral clamp portion including the plate 3, whereby the vibration mode
of the diaphragm 5 There is a drawback that the frequency characteristics of the intensity of the
acoustic wave emitted from the vibrating plate are greatly disturbed. In addition, since the
number of parts is large, the cost of materials and processing is increased, and at the same time
the dimensional accuracy of parts is required, the cost is high.
The present invention has been made to eliminate the above-mentioned drawbacks of the prior
art, and by using a special jig while simultaneously applying plating to the entire surface with a
metal that adheres to the material of the frame at the same time, the diaphragm is
simultaneously By forming it with the plated metal, it is completely integrated with the frame and
the outer periphery of the diaphragm is fixed to the frame by fixing the frame to the plate
without clamping the outer periphery of the moving plate by spacers etc. The purpose is to
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings. In FIG. 2, 1 is a pole piece, 2 is a magnet, 3 is a plate which faces the pole piece 1 and
is disposed while maintaining a constant air gear, and the pole piece 1 magnet 2 and plate 3 It is
fixed by medicine. The numeral 4 is a voice coil disposed in the air gap, and 5 is a diaphragm
integrally formed with the plating layer attached to the frame 6, and using a jig having a
diaphragm shape, the plating layer is formed on the jig surface and the frame Then, the jig is
removed to form a diaphragm. A voice coil 4 is fixed to the diaphragm 5. Reference numeral 9
denotes a fixing screw for fixing the frame 6. Next, the operation will be described. A magnetic
flux generated from the magnet 2 flows in an air gap portion formed by the pole piece 1 and the
plate 3 to maintain a constant magnetic flux density. An alternating current flows through the
electric wire 4a which is wound around the voice coil 4 housed in the coffin, and a vertical force
is generated in the figure in accordance with the left-hand rule of framing. The force is
transmitted to the diaphragm 5 because the upper end of the voice coil 4 and the diaphragm 5
are fixed by the adhesive. The diaphragm 5 is integrated with the plating layer attached to the
frame, and the outer periphery of the diaphragm is clamped only by fixing the frame to the plate
3 with the fixing screw 9. As described above, according to the present invention, since the
concave planar diaphragm is integrally formed with the plated layer attached to the entire
surface of the frame, the diaphragm is fixed to the frame itself without any special clamping.
Therefore, it is possible to provide a speaker of uniform quality without affecting the variation
such as the pressing pressure (clamping pressure) of the clamp portion, and at the same time
reducing the number of parts and improving the working efficiency. There is an effect that can
be manufactured.
[0002]
Brief description of the drawings
12-04-2019
2
[0003]
FIG. 1 is a cross-sectional side view showing a conventional concave flat speaker for high-pitched
sound reproduction, and FIG. 2 is a cross-sectional side view showing a concave flat speaker for
high-pitched sound reproduction according to an embodiment of the present invention.
In the figure, 1 is a pole piece, 2 is a magnet, 3 is a plate, 4 is a voice coil, 5 is a diaphragm, 6 is a
frame, 78 is a spacer, and 9 is a mounting screw. In the drawings, the same reference numerals
indicate the same or corresponding parts. Agent Masao Oiwa
12-04-2019
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