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JPS61116499

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DESCRIPTION JPS61116499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker for use in an electroacoustic apparatus. 5 (Conventional Configuration and Problems
Thereof) A conventional loudspeaker will be described with reference to FIG. In the figure, in the
speaker, an annular magnetic gap 4 is formed by an arm-shaped yoke 1 and a disk-shaped top
plate 3 fixed via a magnet 2 at a central portion thereof. The voice coil 6 coupled to the
diaphragm 5 is inserted, and the diaphragm 5 is held on the outer peripheral surface of the arm
yoke 1 by the bonding portion 8 at the periphery of the edge portion 7 integrally formed on the
outer periphery of the diaphragm 5 The frame 9 is fitted and fixed. The above-described
diaphragm 5 is formed by heat-forming a polyester resin film or the like, and the edge portion 7
and the peripheral edge bonding portion 8 are integrally formed. Furthermore, the edge portion
7 is shaped into a waveform in order to prevent the resonance of the edge and to lower the
lowest resonance frequency of the diaphragm 5. However, since the edge portion 7 is integrally
formed of the same material as the diaphragm 5, only the edge portion 7 can not increase the
internal loss, and hence the occurrence of the edge resonance can not be prevented. Therefore,
there is a problem that a valley occurs in the output sound pressure frequency curve. Also, in
order to lower the lowest resonance frequency, it is necessary to increase the compliance of the
edge portion 7, but since the diaphragm 5 and the edge portion 7 are integrally formed, only the
edge portion 7 should be thinned or softened. There is also a problem that the reduction of the
lowest resonance frequency is extremely difficult. Furthermore, since the edge portion 7 is
formed in a corrugated shape, the edge portion 7 is reinforced to increase the rigidity more than
the portion of the diaphragm 5, and it is bent at the portion of the diaphragm 5, which easily
causes a rolling phenomenon. The so-called gap defect in which the voice coil 6 swings laterally
in the magnetic gap 4 is not only generated, but there is also a problem that the effective radius
of the diaphragm 5 becomes small and the output sound pressure level is lowered. (Object of the
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Invention) The present invention solves the above-mentioned drawbacks, and by using a
diaphragm integrally formed with a resin film at the edge portion of the diaphragm, the
minimum resonance frequency is lowered to enable wide-band reproduction. It is an object of the
present invention to provide a speaker having a flat frequency characteristic without peaks and
valleys in the output sound pressure frequency curve. (Configuration of the Invention) In order to
achieve the above object, the present invention The resin film is heat-formed to make the edge
part integrally formed on the outer periphery of the diaphragm flat to increase the compliance of
the edge part, and further one or two arc-shaped slits that draw concentric circles at the edge
part. Attach the adhesive tape to the back of the slit to continuously move the edge to make the
edge move more easily and reduce the lowest resonance frequency and increase the internal loss
due to the deformation of the edge. Braked, it is to try to prevent the edge resonance.
Furthermore, by reducing the rigidity of the edge portion, the rolling phenomenon of the
diaphragm is prevented, the effective area is enlarged, and the reduction of the sound pressure
level is prevented. DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment
of the present invention will be described with reference to FIGS. FIG. 2 is a cross-sectional view
of a loudspeaker according to an embodiment of the present invention, wherein a flat edge
portion 1 ° and an adhesive portion 8 are formed on the outer periphery of the diaphragm 5 by
heat molding of polyester resin film or the like. It is the same as the prior art example of FIG. 3
(a) and 3 (b) are a plan view and a side view of the diaphragm and the edge portion of the
embodiment of FIG. 2, respectively, and are arc-shaped provided at the edge portion 1o of FIG. A
concentric circle is drawn by the slit 12 and the connecting moon 13 with a width of 1 to 2
tones, and the adhesive tape 11 is attached to the back surface of the edge portion 1 o. FIG. 4 is a
plan view showing a diaphragm and an edge portion according to another embodiment of the
present invention, in which circular arc-shaped slits 14 and 15 describing double concentric
circles and these are mutually shifted by 1/2 pitch. The joints 16 and 17 are provided. In this
way, since the compliance of the edge portion 1o becomes large and the compliance becomes
large, the lowest resonance frequency 11 <'falls, and as the buildup resonance hardly occurs in
the increase of the internal loss of the edge portion, the output sound pressure frequency curve
becomes wide band Flat frequency holding ability without mountains and valleys was obtained,
and the output sound pressure level was further improved. Further, the adhesive tape 11
attached to the back surface of the edge portion 10 also serves to prevent foreign matter from
intruding into the speaker from the slits 12.14 and 15. (Effects of the Invention) As described
above, according to the present invention, the resin film is heat-formed to integrally form the
diaphragm and the edge portion, and the lowest resonance frequency is lowered, and a wide
band flat output sound pressure is obtained. A speaker having frequency characteristics can be
obtained. Furthermore, the effect of improving the sound pressure level can be obtained by
widening the effective area of the diaphragm.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a conventional speaker, FIG. 2 is a cross-sectional view of a
speaker according to an embodiment of the present invention, and FIGS. 3 (a) and 3 (b) are
diaphragms of an embodiment of FIG. FIG. 4 is a plan view and a side sectional view of an edge
portion, and FIG. 4 is a plan view of a diaphragm and an edge portion according to another
embodiment of the present invention.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 5 , 8:
adhesive part, 9: frame, 11: adhesive tape, 12, 14.15 ... slit, 1 3, 1 6, '1 7... . Figure 1 Figure 2 r
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