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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the main part
of a conventional cone speaker, FIG. 2 is a curve showing frequency characteristics and distortion
characteristics given by the course speaker of FIG. 1, FIG. FIG. 4 is a cross-sectional view of an
essential part showing one embodiment of a cone speaker according to the present invention,
and FIG. 4 is a curve diagram showing frequency characteristics and distortion characteristics
given by the cone speaker of FIG. 21: cone 22: end 23: voice coil 24: coil hobin 25: foam resin for
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cone speaker, and in
particular to an improvement of its cone section :. Conventionally, a cone speaker like the one
shown in FIG. 1 has been considered. That is, the cone 11 is filled with the old resin 12 for
reinforcement in order to improve the acoustic characteristics by suppressing the occurrence of
distortion or the like due to so-called minute movement as much as 6f. In the figure, reference
numeral 13 is a cone edge, 14 is a center cap, and 15 is a voice coil wound around the coil
bobbin 16. A magnet etc. which is fixed corresponding to the chair coil 15 corresponding to L / 2
β 77 No illustration is omitted for the magnetic attachment. However, in such a cone speaker,
the portion to be added to the extravagant fruit by the foamed resin 12 is only at the cone 11
part above the center cap 15 filled with the foamed resin 12. The deflection caused by the coil
bobbin 16 can be pushed by a human-powered signal provided to the Heuss coil 15, and
distortion of the body as distortion. L acoustic characteristics-, "Kyoto University was left behind.
Fig. 2 shows the frequency characteristics 4 and the second-order distortion characteristic 1 and
the third-order distortion characteristic (C1 shown in Fig. 2) applied with such a conventional
cone speaker. However, both second-order distortion and third-order distortion are considerable.
It is known to be present in quantity. Then, this 4th proposal was made in view of the above
points, and the division | segmentation of a cone part is carried out by extending the foaming
resin for reinforcement filled in a cone part to the bobbin part of a voice coil and filling it
integrally. Vibration and deflection of the coil bobbin are both aJ and □ □. The purpose is to
provide a very good cone speaker that is suppressed to thereby suppress the acoustic
characteristics to be C-directional. One practical example of the present invention will be
described in detail with reference to the olfactory drawing. Also, in FIG. 3, in FIG. 3, 2I is a cone
having a so-called double-bore L-shaped cone made of a so-called mirror plate material such as
cone paper, and an edge 22 is formed at its prosecution j1 green. In addition, a coil bobbin 24 on
which the voice coil 23 is wound is attached to the opening edge of the base end of the cone 2! #
Will be met. By the way, the inside 1- of the cone 21 is filled with a foam resin for reinforcement
(for example, foam roll, foam polystyrene roll, foam urethane, foam urethane, etc.) 25. In this
case, the filling area of the foam resin 2 is Is set to be integrally filled not only in the cone 21 but
also in the coil bobbin 24.
A cone speaker is completed by attaching a magnetic device (not shown) corresponding to the C1
pois coil 23 part. As mentioned above, the cone speaker made C @ as described above has the
foam resin 25 for cocoon ball integrally filled not only in the cone 2 but also in the coil bobbin
24 B. In addition to suppressing or writing the main part 91 or the obsessive part, the deflection
generated in the coil povin 24 can also be controlled by the power signal applied to the voice coil
23, so that they are caused due to them. Distortion can be suppressed as much as possible. FIG. 4
shows the real 7-law data of the wave number characteristics (8) and the second-order distortion
characteristics (C) and the third-order distortion characteristics C) given by such a cone speaker,
and the second-order distortion and the third-order distortion In any case, it is possible to
significantly reduce the noise level as compared with the conventional one shown in FIG. 2 and to
contribute to the effective 1 oj increase of the acoustic characteristics by the boundary
knowledge Z ''-b. In addition, since the center cap required in the conventional cone speaker can
be made unnecessary in a sharp manner, the cost of the island can be reduced accordingly. なお
、この#! The draft J is not held only in the case of the above-mentioned clashingly shown, but
this is not held only in this example] J @ 察 J J) It is said that there are various changes in the o4
exposure C without departing from the gist Absent. Therefore, according to this proposal, as
described in detail in one or more of the above, the old grease for the chrysanthemum is not
filled in with the g-bottle of the voice coil but with the g4% L integrally filled with Part σ) 9. It is
possible to suppress the deflection of the coil bobbin as well as a) and to suppress the deflection
of the coil bobbin together and thereby to effectively improve the acoustic characteristics by 1;
thus providing a very favorable konnosaur of an improved quality. It becomes possible.
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