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JPS5591294

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DESCRIPTION JPS5591294
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the main part of a
conventional speaker, FIG. 2 is a cross-sectional view of the main part of a speaker according to
an embodiment of the present invention, and FIG. 3 is a hollow edge of the same speaker. FIG. 4
is an explanatory view of the operation of the speaker according to the present invention, FIG. 5
is a view showing the relationship between the displacement of the edge of the speaker
according to the present invention and that of the conventional speaker and stress, and FIG. 6 is
another embodiment of the present invention. It is a sectional view of an important section. 3 · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · hollow edge, 7 · · · ·.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker in
which the peripheral edge portion of a diaphragm is supported by a novel edge, which has
excellent linearity, reduces non-linear distortion, has a small apparent area of the edge portion,
and emits unnecessary sound. It is an object of the present invention to provide a speaker which
can reduce the influence of the edge portion on the sound pressure frequency characteristic. As
an edge material of the present speaker, a composite in which a visco-elastic material is coated
on a base material such as paper 9 urethane foam and cloth is often used, and the shape thereof
is often corrugated or roll. In general, the required performance is light, with a small area and
internal loss. 1711. ケア4、う、ア。 -The ability to follow the vertical movement of the
diaphragm is worse than that of the diaphragm 2 and nonlinear distortion occurs, causing
problems such as the inability to apply a large input. Currently, most of the roll-shaped edges are
used. There is. Therefore, the area of the edge of the conventional speaker occupies a
considerable proportion of the area of the diaphragm, and the effect on the sound pressure
frequency characteristic appears due to the anti-resonance of the edge, and the dip occurs in the
middle range . FIG. 1 shows an edge portion of a conventional speaker. Reference numeral 1
denotes a ring-shaped edge having a semicircular (rolled) cross section. The ridge 2 on the outer
periphery of the edge 1 is attached to the frame 3, and the peripheral edge of the screen 4 is an
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inner periphery of the edge 1. Is attached to the protrusion 5 of the However, in the conventional
speaker shown in FIG. 1, the area of the edge 1 is large, and the anti-resonance of the edge 1 has
a drawback that a dip (valley) occurs in the midrange of the sound pressure frequency
characteristic. The present invention eliminates the above-mentioned conventional defects, and in
the following, one embodiment of the present invention will be described with reference to FIGS.
2 and 3. In FIGS. 4 is a diaphragm, 6 is a hollow edge of an oval cross section made of an elastic
material such as urethane or neobrene rubber, and the central portion of the outer peripheral
surface of the hollow edge 6 is adhered to the inner peripheral surface of the frame 3 in a ring
shape. ing. The peripheral portion of the diaphragm 4 is bonded in a ring shape at the central
portion of the inner peripheral surface of the hollow edge 6. Next, the operation of the present
invention will be described. As shown in FIG. 4, when the diaphragm 4 is moved upward as
shown by the broken line, the hollow edge 6 is shown by the broken line, the inner peripheral
portion of the hollow edge 6 having an elliptical cross section becomes the upper surface portion
and the hollow edge 6 It deform | transforms, maintaining an elliptical shape so that the outer
peripheral part of 6 may turn into a lower surface part. FIG. 5 shows the relationship between the
displacement and the stress between the hollow edge a of the speaker of the present invention
and the edge b of the conventional speaker.
As apparent from FIG. 5, according to the present invention, the linearity of the edge is excellent,
and the area of the front of the edge can be made smaller than the area of the diaphragm, and
the sound pressure frequency characteristics due to the antiresonance of the edge can be
obtained. It is possible to reduce τS \ influence. FIG. 6 shows another embodiment of the
present invention. In FIG. 6, 3 is a frame, 6 is a hollow edge, 7 is a disk-shaped diaphragm which
is adhered to the inner peripheral surface of the hollow edge 6 in a ring shape. Although the
hollow edge having an elliptical cross section is originally used in any of the above embodiments,
a hollow edge having a circular cross section is provided between the peripheral portion of the
diaphragm and the frame to be deformed into an elliptical cross section. It is good. The speaker
according to the present invention is configured as described above. According to the present
invention, the linearity of the vertical movement of the edge is good and the area of the front
surface of the edge can be reduced. It has the advantage that the impact can be reduced.
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