JPS52170036

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DESCRIPTION JPS52170036
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
speaker diaphragm, and FIG. 2 is a diagram showing a vibration mode in the vicinity of the high
frequency limit frequency of the speaker diaphragm shown in FIG. 3 Figure A. B is a crosssectional view showing an embodiment of the present invention, and FIG. 4 is a sound pressurefrequency characteristic of a speaker using the speaker diaphragm according to the embodiment
of the present invention and a speaker using the conventional speaker diaphragm It is a
comparison figure. 1 ... diaphragm, 2 ... viscoelastic material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm, and more particularly to a KiIk suitable speaker diaphragm for use in a cone type
speaker. FIG. 1 is a cross-sectional view showing an example of a conventional diaphragm for a
cone-shaped speaker. As shown in FIG. 1, the thickness of the diaphragm l has a shape that is
uniform over the entire length or that the outer peripheral portion is thick. When such a
diaphragm 1 is incorporated into a speaker, a peak corresponding to this loss appears on the
output sound pressure frequency characteristic, and in particular, appears prominently in the
upper limit frequency. And this difference may reach 5 to lQ dB. +11 'Yin Yonji]-' ' ; 3) The W2
figure shows the vibration mode of the moving plate l near the upper limit frequency. As
apparent from this figure, in the vicinity of the high frequency band limit frequency, the inner
peripheral portion of the moving plate 1, the portion of% of the bus length from the cone top and
the amplitude are particularly large, and complex imaging motion is exhibited. In order to
improve the characteristics at the upper limit frequency, it is necessary to suppress shooting 1 of
the portion of bus length 5 from the top of the cone as described above, and a countermeasure
against this point has been desired. The present invention has been made in view of the abovedescribed conventional drawbacks, and is an imaging board for a speaker in which tampering of
output sound frequency characteristics is attempted by applying or applying a visco-elastic
material to the inner peripheral portion of the imaging board. The purpose is to provide FIG. 3 is
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a cross-sectional view showing an embodiment of the present invention LBI'1. The adhesive
material 2 is stuck or applied to the front surface of one part of the m3 [t1 (A) d imaging moving
plate l, and in FIG. 2 is stuck or applied. In any case, the material of the viscoelasticity (2) 9,-is
used with a large loss, and it is attached or applied to the portion of h at the generatrix length
from the top of the cone as described above. It is possible to suppress the & width in the vicinity
of the high frequency band upper limit frequency than this K and make the output frequency
sound pressure flat. FIG. 4 is a comparison diagram of sound pressure to frequency
characteristics of a speaker using the speaker diaphragm according to the embodiment of the
present invention and a speaker using the conventional speaker diaphragm. 11! In FIG. 4, the
vertical axis represents sound pressure, and the horizontal axis represents frequency. In the
drawing, a solid line A is a conventional imaging plate, and a broken line B is a characteristic of
each speaker when the imaging plate according to the embodiment of the present invention is
used. The diaphragm according to the embodiment of the present invention is stable in the high
region and shows the travel-time property in the fourth section. As apparent from the above,
according to the present invention, it is possible to flatten the sound pressure and frequency
characteristics without lowering the high frequency band limit frequency so much.
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