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DESCRIPTION JPS5663181

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DESCRIPTION JPS5663181
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a conventional speaker,
FIG. 2 is a half sectional view showing one embodiment of the speaker of the present invention,
and FIGS. 3A to 3C are subcones used for the same speaker. FIG. 4 is a top view showing an
example, and FIG. 4 is a sound pressure frequency characteristic diagram of the speaker of the
prior art and the present invention. 14 и и и и Magnetic circuit, 19 и и и и и и и и и и и и и и Main diaphragm,
22 и и и и и и и и и и и и и и и и и и и Magnetic gap, 25 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Through hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
provided with a subcone, in which an interference hole between the main diaphragm and the
subcone is reduced by providing a through hole on the side wall of the subcone to obtain a flat
sound pressure frequency characteristic. It is The conventional loudspeaker of this type is
configured as shown in FIG. That is, the frame 6 is coupled to the magnetic circuit 6 constituted
by the plate 2 for center pole-M, the ring-shaped magnet 3 and the ring-shaped 973 '/ 2 upper
plate 4 as well. At the same time, the peripheral portion of the main diaphragm 8 is coupled, the
voice coil 9 is coupled to the central portion of the main diaphragm 8, the middle portion of the
voice coil 9 is held by the damper 10, and the lower portion of the voice coil 9 is magnetically
The magnetic gear knob 11 of the circuit 5 is fitted without eccentricity, and the upper end of the
voice coil 9 is constructed by coupling a sub-co-712 which also serves as a dust cap. The speaker
of this configuration has an advantage that the reproduction band extends from the low band to
the entire high band. However, in the above configuration, interference occurs at a specific
frequency in the air gap 13 between the main diaphragm 8 and the sub-cone 9, and the sound
pressure frequency characteristic causes a large dip in the high region as shown by the solid line
in FIG. Met. Although attempts have been made to insert a sound absorbing material or the like
into the air gap 13 in order to eliminate such disturbance of the sound pressure frequency
characteristics, there were three cases where a satisfactory result could not be obtained. The
present invention eliminates the above-mentioned conventional drawbacks. Hereinafter, an
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embodiment of the speaker of the present invention will be described with reference to FIGS. A
magnetic circuit 14 comprises a plate 16 having a center pole 15, a ring-shaped magnetic pin 17,
and a ring-shaped upper plate 18. A frame 19 is connected to the magnetic circuit 14, and a
peripheral edge of the main diaphragm 210 is bonded to the peripheral edge of the frame 190
together with a gasket 20 by adhesion or the like. A voice coil 22 is coupled to a central portion
of the main diaphragm 21, and an intermediate portion of the voice coil 22 is held by a damper
23, and a lower portion is fitted into the magnetic gap 24 of the magnetic circuit 14 without
eccentricity. . Further, a sub 4-cone 26 also serving as a dust cap is coupled to the upper end of
the voice coil 22 or the central upper surface of the main diaphragm 21, and a plurality of
through holes 26 are provided on the side wall of the sub-cord 726. The shape of the through
hole 26 can be various shapes such as a circular hole, a rectangular hole, and a triangular hole as
shown in FIG. 3A-C.
By providing the through hole 26 in the sub cone 25 in this manner, the pressure due to the
mutual interference generated in the air gap 27 between the main diaphragm 21 and the sub
cone 26 partially escapes from the through hole 26, thereby causing mutual interference. The
sound pressure frequency characteristic can be made flat as shown by the broken line in FIG. As
described above, the speaker according to the present invention has advantages such as
reduction of interference between the main diaphragm and the sub cone and flattening of the
sound pressure frequency characteristic by simply providing the through hole in the sub cone,
and the configuration can be simple and inexpensive. It has great practical value.
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