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JPH0383494

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DESCRIPTION JPH0383494
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker used for various sound #J
devices. Prior Art A conventional loudspeaker of this type is configured as shown in FIG. That is,
the frame 5 is coupled to the upper plate 2 of the magnetic circuit 4 configured by sandwiching
the magnet 1 by the upper plate 2 and the lower plate 3, and the fibers are vertically elongated
as shown in FIG. The directional fiber 11 and the transverse fiber 12 are arrayed and the
diaphragm 6 composed of a flat structure is adhered, and the voice coil 7 for driving the
diaphragm 6 is centered by the damper 8 and fitted in the magnetic gap 9 The dust cap 10 is
bonded to the surface of the connecting portion of the diaphragm 6 and the voice coil 7 so as to
be embedded therein. SUMMARY OF THE INVENTION However, the conventional speaker of this
type achieves high performance by using the diaphragm 6 obtained by weaving fibers, but the
conventional diaphragm 6 The direction of arrangement of the vertical and horizontal directions
is formed, this is shaped, and the neck portion is driven by the voice coil 7 to be directed to the 6
···· direction when vibration is transmitted to the outer peripheral direction of the diaphragm 6
And distortion can not be generated and can not be transmitted faithfully, and as a result, the
speaker is not suitable for high fidelity reproduction. The present invention solves such
conventional problems, and provides a speaker having a fiber m-type system moving plate
excellent in high fidelity reproduction. Means for Solving the Problems In order to solve the
above problems, according to the present invention, the knitting direction of the fibers of the
diaphragm is not knitted in the longitudinal and transverse directions as in the prior art, but is
knitted in the radial and circumferential directions. The speaker is constructed using the
diaphragm obtained in this manner. In the configuration described above, when the neck portion
of the diaphragm is driven by the voice coil, when the vibration is transmitted in the outer
peripheral direction of the diaphragm, the transmission of the vibration is uniformed in the
circumferential direction and the directivity Because the diaphragm does not vibrate
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unnecessarily, the occurrence of distortion can also be eliminated, so that the vibration of the
voice coil can be faithfully transmitted to the outer periphery of the diaphragm, and as a result,
the speaker can be lowered. Distortion and high fidelity reproduction can be achieved.
Embodiment Hereinafter, a speaker according to an embodiment of the present invention will be
described with reference to the drawings. As shown in FIG. 1, the frame 25 is coupled to the
upper plate 22 of the magnetic circuit 24 configured by sandwiching the magnet 21 by the
upper plate 22 and the lower plate 23, and the peripheral portion of the frame 25 is shown in
FIG. As shown, the fibers are arranged in radial direction fibers 31 and circumferential direction
fibers 32, and are sealed with a thermoplastic resin such as epoxy resin, polyurethane resin,
polypropylene resin or the like to form a flat structure having a cone shape The voice coil 27 for
driving the vibration plate 26 is centered by the damper 28 and coupled so as to be fitted into
the magnetic gap 29, and the voice coil 27 of the vibration plate 26 is bonded. The dust cap 30 is
adhered to the surface of the joint portion with the above to make a draft.
The vibration of the voice coil 27 can be faithfully transmitted to the outer periphery of the
diaphragm 26 by using the diaphragm 26 composed of the radial direction til fibers 31 and the
circumferential direction fibers 32 as described above, and distortion is reduced. , High fidelity
reproduction can be achieved. As described above, according to the present invention, the
diaphragm of the fiber knitting type is not constituted by the longitudinal fibers and the
transverse fibers as in the prior art, but by the radial fibers and the circumferential fibers as a
diaphragm Since it is used, when the neck portion of the diaphragm is driven by the voice coil,
when the vibration is transmitted in the outer peripheral direction of the diaphragm, the
transmission of the vibration is uniformed in the circumferential direction and the directivity is
eliminated. Since the diaphragm does not vibrate unnecessarily, the generation of distortion can
be eliminated, and the vibration of the voice coil can be faithfully transmitted to the outer
periphery of the diaphragm. Further, the sound pressure frequency characteristics can be freely
changed by changing the hardness of the thermoplastic resin used for sealing between the fibers
of the diaphragm. Furthermore, it is also possible to change the sound pressure frequency
characteristics by changing the number of fibers to be knitted. Also, this type of diaphragm
improves the density of fibers as it gets closer to the center compared to the outer periphery, and
improves the rigidity of the center, which can improve the high-frequency reproduction limit
frequency, thus achieving high fidelity reproduction Can also be improved. Furthermore, as an
effect other than the above, since this diaphragm is configured point-symmetrically about the
center of the diaphragm as compared with the conventional diaphragm, the diaphragm is
angularly shifted at the time of bonding the diaphragm to the frame There is no problem in
appearance and design even if it is bonded, so it is possible to reduce evening defects (wrinkle
defects). As described above, the speaker using this diaphragm is easy to control the sound
pressure frequency characteristics, and can achieve low distortion, high fidelity reproduction,
high sound quality, and reduction in appearance defects. Its industrial value is enormous.
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[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a speaker according to an embodiment of the present invention, FIG.
1 is a top view of a diaphragm according to the present invention, FIG. 3 is a cross-sectional view
of a conventional speaker, and FIG. 4 is a top view of a conventional diaphragm It is.
21 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · ...... ----- radial direction m Wei, 32 ...... circumferential fibers.
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