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JPS559176

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DESCRIPTION JPS559176
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a cone speaker
according to the present invention, and FIG. 2 is a view showing the characteristics of the cone
loudspeaker according to the present invention with a conventional product. Explanation of the
symbols of the main parts, 5: voice coil, 8: cone, 9: eyebrow / tarcap, 10: end, 13: tinsel wire, 15:
+ flJ motion Element.
DETAILED DESCRIPTION OF THE INVENTION (-f η vs. 6Il:-This invention relates to a cone
speaker. In recent years, the tendency toward miniaturization of the speaker system has been
strong, and a vibration system of hyphen priority has been required to improve the low
frequency reproduction characteristics. In such a high compliance vibration system, the weight
balance of the vibration system is broken due to the presence of a tinsel wire connected to a
cone, solder, etc., and an abnormal vibration occurs in the middle region, and an abnormal sound
is generated by a voice coil etc. Occurs. In order to avoid this problem, it is conceivable to
increase the lowest resonance frequency of the vibration system or to make the extraction of the
tinsel wire symmetrical, etc. However, if the former method is adopted, the low frequency
reproduction frequency becomes high, The latter measure is not perfect because it has
disadvantages such as causing a polarity defect and cost increase. Therefore, an object of the
present invention is to provide a cone speaker having excellent characteristics without the abovementioned problems. Hereinafter, an embodiment of the present invention will be described in
detail with reference to the drawings. 2-T FIG. 1 shows a cone speaker according to the invention.
A back plate 1 has a pole piece 2 mounted on the central portion of the bank plate, and a magnet
3 mounted on the peripheral portion. The plate 4 is mounted on the magnet 3 and forms a
magnetic gear knob with the pole piece 2. A voice coil bobbin 6 carrying a voice coil 5 is
vibratably inserted into the magnetic gap and supported by a damper 7. A cone 8 is coupled to
the voice coil bobbin 6 at its central hole, and a center cap 9 is further crowned. The opening
peripheral edge portion of the conical core 78 is supported by the frame 11 via the edge 1Otl-.
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The edge 10 is further secured to the frame 11 by a gasket 12. Further, the lead wire of the voice
coil extends on the inner wall surface of the cone 8 and is connected to a terminal 14 provided
on the side surface of the frame 11 through a conductive wire such as a tinsel wire 13, for
example. The portion described above is the same as that of the conventional cone speaker, but
the cone speaker company according to the present invention preferably has a damping member
15 made of a vibration absorbing material i1- °-in a portion where the cone 8 is attached to the
edge 10. The braking member 15 has its center of gravity in the plane including the connection
point and the central axis on the opposite side of the central axis of the cone 8 with respect to
the contact point or connection point of the tinsel cord 13 to the cone 8. Provided. The weight
and mounting position of the braking member 15 are selected such that a moment is given to the
cone 8 so as to cancel the moment due to the tinsel wire.
In the cone speaker as described above, since the weight balance of the vibration system
including the cone 8 is good, good characteristics can be obtained. FIG. 2 shows an example of
the characteristics of a cone speaker according to the present invention. The IIIIl line shows the
characteristics of the conventional product, and the thick line shows the characteristic example
of the cone speaker according to the present invention. It is clear from this figure that, in the
characteristics of the loudspeaker according to the present invention, the peak in the
characteristics of the conventional product is smaller. In the above embodiment, a truncated cone
is used, but it is of course possible to use cones or other shapes of cones. 4−
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