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JPS55115798

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DESCRIPTION JPS55115798
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a speaker, and more
particularly to a speaker with small distortion and excellent frequency characteristics by using a
fiber reinforced resin cone having a special structure. FIG. 1 is a cross-sectional view of a
conventional speaker, in which there are a magnet 2 and a pole piece 6 installed in a yoke 1, a
coil bobbin 4 is inserted around the pole piece 6, and one end of the coil bobbin 4 The cone 6 is
bonded, and the tip of the cone 6 is supported by the frame 8 via the damper 7. The lower end of
the frame 8 is fixed to the yoke 1 and supports the coil bobbin 4 via a damper 9. Further, a
spherical center cap 10 is adhered to the inner peripheral surface of the cone 6. By sending an
electrical signal from a lead wire (not shown) connected to the voice coil 5, a magnetic force is
applied to the coil bobbin 4 and the coil bobbin 4 vibrates up and down in FIG. It has a structure
that makes it sound like it is transmitted. The material of the corn cake is usually valve
papermaking, fiber reinforced resin or the like, and the adhesion between the cone 6 and the coil
bobbin 4 is carried out with an adhesive. It has been conventionally known that the performance
of a speaker is greatly influenced by the material, shape, etc. of a cone. It is said that the
properties required for the cone are that both the specific stress (E / ρ) and the internal loss (tan
δ) are large, and that the shape of EndPage: 1-one has no distortion. However, conventional
loudspeaker cones have not been able to satisfy all of these. For example, a pulp papermaking
cone has a relatively small distortion in shape because it is made into a cone shape, and the
characteristics of the pulp are also relatively large in internal loss, but sufficient stress can be
obtained because the stress to density is small. It was not. Also, a cone made of a fiber reinforced
resin, in particular a resin reinforced with carbon fiber, glass fiber, etc. has a sufficiently large
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specific stress, but a distortion occurs in the cone shape and the internal loss can not be said to
be sufficiently thick. There was a drawback that a good voice could not be obtained. The present
inventors diligently studied to ameliorate the drawbacks of the prior art as described above, and
reached the present invention as follows. That is, the present invention has a magnetic circuit, a
cylindrical coil bobbin disposed in the magnetic circuit, a voice coil wound around the coil
bobbin, and a fiber reinforced resin cone joined to one end of the coil bobbin, And the annular
rim part is provided in the junctional part with the said coil bobbin of the said cone, The said coil
bobbin is a speaker characterized by being joined to the outer surface of the said rim part.
Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 2 is a cross-sectional view of the loudspeaker according to the present invention, but the
structure other than the cone portion is the same as that of FIG. In FIG. 2, the cone 6 according to
the present invention is made of a fiber reinforced resin to be described later, and this cone 6 has
an annular rim portion 11 at the junction with the coil bobbin 4. Furthermore, the coil bobbin 4
is joined to the outer surface of the rim portion 11, that is, the outer peripheral surface. By
providing such a rim portion 11, it is possible to eliminate the shape distortion of the fiber
reinforced resin cone 6 and maintain an accurate cone shape. The rim portion 11 has an Lshaped cross section in FIG. 2, but it is not limited to this shape as long as it has an area that can
contact the coil bobbin 4 on the outer peripheral surface. However, if the contact surface of the
rim portion 11 with the coil bobbin 4 is enlarged, the gap where the coil bobbin moves up and
down due to the magnetic vibration, the lowermost portion of the rim portion 11, or the bonded
portion between the coil bobbin 4 and the rim portion 11 It is preferable that the rim portion 11
not be too long, since the adhesive that has flowed out contacts the upper surface of the pole
piece 3 to inhibit the acoustic effect. By bending the cross section into an L shape as shown in
FIG. 2, it is possible to efficiently correct the warp and distortion of the entire cone. In the
embodiment of FIG. 2, a flange 12 is provided at the upper end of the cone 6, and the flange 12
is supported by a frame 7 on a damper 7. The provision of such a flange 12 further prevents
distortion of the cone 6. The provision of the rim portion 11 on the cone ridge prevents the
distortion of the cone, so the installation of the flange 12 is not necessarily essential, but the
fibers of the cone do not bend as shown in FIG. 3 as described below Where a rod is made of
carbon fiber, or when a unidirectional prepreg is laminated at an angle of 0 to 90 ° to form a
cone, it is preferable to provide the flange 12. The material of the corn according to the invention
will now be described. The corn according to the present invention needs to be made of a fiber
reinforced resin, and in general, a fiber reinforced resin is a fiber of high elasticity impregnated
with a resin and cured. The fibers used in the present invention include carbon fibers, glass
fibers, organic high modulus fibers such as aromatic polyamides, and carbon fibers are
particularly preferable. Of course, these fibers may be mainly mixed with other synthetic fibers.
The arrangement of fibers, and the structure in the case of a fabric are not particularly limited,
and may be any of simply stacking a large number of fibers, ordinary fabrics, etc. In the present
invention, a particularly preferred embodiment is carbon fibers 13 as shown in FIG. Is a straight
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rod-like shape which is not crimped and, for example, glass fibers 14 are crimped and wave-like
entangled for shape retention.
Such a structure has a large reinforcing effect, and the trunk of the corn is extremely large, but
the distortion of the corn is easy to occur EndPage: 2 Therefore, in the present invention, it is
necessary to provide a rim portion as described above to absorb distortion, and these two
requirements are combined with each other to exert a synergistic effect. Next, the type of resin
used is a thermosetting resin such as epoxy and unsaturated polyester, and a thermoplastic resin
such as polyester and polyamide, but is preferably a thermosetting resin, more preferably based
on an epoxy resin It is a thing. Hereinafter, other embodiments of the present invention will be
described. In FIG. 2, the center cap 10 is usually made of aluminum foil, cloth, paper or the like,
but like the material of the cone of the present invention, it is made fiber reinforced resin and its
mounting position is slightly shifted to the center Is also a preferred example. FIG. 4 is a sectional
view showing an embodiment in which a band-like lip 15 is provided on the outer peripheral
surface of the middle portion of the cone 6, which is a preferable example. This lip 15 can be
provided at various places of the cone except for the position shown in FIG. 4, and the material of
this lip 15 is preferably a fiber reinforced resin. The present invention has the following excellent
effects. (1) By using a cone made of a fiber reinforced resin, V 大 き く becomes large, and by
providing a rim portion on the cone, a speaker that emits no distortion and a sound with
excellent frequency characteristics is obtained. (2) By providing the rim portion at the coil bobbin
joint portion of the cone, the verticality of the coil bobbin can be maintained, and the contact
between the coil bobbin and the pole piece can be prevented during the magnetic vibration of the
cone.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a conventional speaker, FIG.
2 is a cross-sectional view of a speaker according to the present invention, FIG. 3 is a fiber
structure diagram according to the present invention, and FIG. It is sectional drawing of an
Example. Reference Signs List 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · coil bobbins, 5 · · ·
voice coil, 6 · · · cone 7.9 · · · damper · 8 · · frame , 10: center cap, 11: rim portion, 12: 7 lunge, 13:
carbon fiber, 14: glass fiber, 15: rib. EndPage: 3
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