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JPS55115797

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DESCRIPTION JPS55115797
Description 1 Title of Invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a speaker, and more
particularly to a speaker having a small distortion and a high frequency characteristic 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 3 installed in a yoke 1, and
(1) a coil bobbin 4 is inserted around the pole piece 3. A Heus coil 5 is wound around 4. A cone 6
is bonded to one end of the coil bobbin 4, and the tip of the cone 6 is supported by the frame 8
via a damper 7. Further, the lower end of the frame 8 is fixed to the yoke 1 and supports the coil
bobbin 4 via a blind 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) in
contact with the voice coil 5 and reading it, a magnetic force is applied to the coil bobbin 4 and
the coil bobbin 4 vibrates up and down in FIG. Vibration is transmitted, and it originates in a
structure that sounds as a sense of sound. The material of the corn dreg is usually pulp
papermaking, fiber reinforced resin or the like, and 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. The properties required
for the cone are said to be specific stress (ry '+ EndPage: 1 (E /)), internal loss (tan δ) both doglike and not distorted in the shape of the cone. However, it has not been possible to satisfy all of
the conventional speaker cones. Communicate Irf valve papermaking Cone 7 type K paper
making shape distortion is relatively small, the characteristics of the pulp are relatively large and
internal loss is also relatively large, but stress for density is small and sufficient voice is obtained
It was not possible. Also, a cone made of a fiber reinforced resin, especially a resin reinforced
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with carbon fiber, glass fiber, etc. has a sufficiently large specific stress, but a distortion occurs in
the cone shape, and it can not be said that the internal loss is sufficiently large. There was a
drawback that it could not be obtained. The present inventors diligently studied in order to
ameliorate the drawbacks of the prior art as described above, and reached the present invention
as follows. That is, the present invention comprises a magnetic circuit, a cylindrical coil bobbin
disposed in the magnetic circuit, a voice coil wound around the coil bobbin, and a fiberreinforced resin cone joined to one end of the coil bobbin, An annular rim portion is provided at a
joint portion between the cone and the coil bobbin, and the coil bobbin is joined to an inner
surface of the rim portion.
Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 2 is a cross-sectional view of the speaker according to the present invention, but since the
structure other than the cone part is the same as FIG. 1 of the prior art, the explanation of each
part is omitted. 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 inner surface, ie,
the circumferential surface, of the rim portion 11. By providing such a rim portion 11, it is
possible to eliminate the shape distortion of the fiber-reinforced resin-made cone weir and
maintain an accurate cone-like shape. In FIG. 2, the rim portion 11 of the cone 6 has a U-shaped
cross section, but it may of course be a T-shaped cross section in the sense of increasing the
bonding portion, and the effect of the cast is still good (j). However, it is preferable to use a rim
having a U-shaped cross section having a groove 12 as shown in FIG. 2 including the effect of
absorbing the shape distortion. Further, in the present invention, it is one of the features that the
inner peripheral surface of the rim portion 11 is joined to the outer peripheral surface of the coil
bobbin 4. Conversely, the outer peripheral surface of the rim portion 11 is the inner peripheral
surface of the coil bobbin 4 Bonding is not impossible but not very effective. For example, if it is
adhered to the inner circumferential surface of the rim portion 11 ヲ coil bobbin 4, the adhesive
will stick to the inner circumferential surface of the coil bobbin 4 and it may flow to the excess
adhesive force S pole piece 3 side is there. Since the clearance between the outer peripheral
surface of the pole piece 3 and the inner peripheral surface of the coil bobbin 4 is usually 1 mm
or less, even a small amount of adhesive may interfere, and as can be understood from FIG. The
part that hits the end may extend downward and adhere to the inner circumference of the coil
bobbin 4 and it may reach the top of the pole piece 3. If you try to avoid this, the length of the
coil bobbin 4 It is necessary to increase the length (5), which is not preferable because the weight
increases. 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, aromatic polyamides and the
like, any organic high modulus fibers and the like, and particularly preferred b is carbon fibers.
Of course, these fibers may be mainly mixed with other synthetic fibers. The arrangement of
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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. However, it is a structure
which is crimped and crosses in a straight rod-like shape and, for example, glass fibers 14 are
crimped and wave-like entangled for shape retention.
Such a tissue has a large reinforcing effect, and the V コ ー ン of the cone is (6) EndPage: 2 very
high, but it tends to cause distortion of the cone. Therefore, in the present invention, it is
necessary to provide a rim portion as described above to absorb distortion, and these two
costumes are combined with each other to exert a synergistic effect. Next, thermoplastic resins
such as epoxy, unsaturated polyester, etc., thermosetting resins, polyesters, polyamides, etc. are
used as the kind of resin, preferably thermosetting resin, more preferably epoxy resin. It is a
thing. Hereinafter, other embodiments of the present invention will be described. In FIG. 2, the
groove 12 in the rim portion 11 of the cone may be hollow, but for example, a resin as described
above, a fiber reinforced resin as described above, a ring of metal such as aluminum, etc. may be
filled and adhered. Is also a preferred example. In FIG. 2, although the tip of the cone 6 is directly
joined to the damper half, it is also a preferable example to provide a flange integrated with the
cone 6 at this tip. In particular, when the fiber structure of the cone has no ring as shown in FIG.
3 or the unidirectional prepreg is laminated at an angle of 0 ° to 90 ′ to form a cone, this
flange portion is particularly The effect of correcting the distortion is great. In FIG. 2, the center
cap 10 is usually made of aluminum foil, cloth, paper or the like, but this is a fiber reinforced
resin similar to the material of the cone of the present invention, and its attachment is slightly to
the center Staggering is also a good example. FIG. 4 is a cross-sectional view showing an
embodiment in which a band-like rib 15 is provided on the outer peripheral surface of the middle
portion of the cone 6, which is a preferable example. The ribs 15 can be provided at various
places of the cone except for the position shown in FIG. 4. The material of the ribs 15 is
preferably fiber reinforced resin. The present invention has the following excellent effects. (1) By
using a cone made of a fiber reinforced resin, E / 発 す る is largely increased, and by providing a
rim portion on the cone, a speaker that emits a sound with undistorted frequency characteristics
is obtained. (2) By providing the rim portion at the coil bobbin joint portion of the cone, the
perpendicularity 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. (3) By bonding
the rim portion of the cone to the outer periphery of the coil bobbin, the bonding becomes
strong, and the cone end and the pole piece upper surface do not come in contact with each
other.
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
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Example. 1: Yoke, 2: Magnet, 3: Pole piece, 4: Coil bobbin, 5: Voice coil, 6: Cone, 7.9: Damper, 8:
Frame, 10: Center cap, 11: Rim portion, 12: Groove, 13: carbon fiber, 14 niglass fibers, 15: ribs.
Attorney Attorney Nobunobu Ogawa-Attorney Noguchi Kensuke (9) EndPage: 3
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