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JPS5054141

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DESCRIPTION JPS5054141
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a prior
art embodiment, and FIG. 3 is a longitudinal sectional view showing one embodiment of the
present invention. 1 is a diaphragm, 2 is an edge, 3 and 4 are elastic bodies, 5 is a frame, and 6 is
a cover. Fig.1 Fig.2- Fig.2-97-Actual opening 50-54141 (2) -98
[Detailed description of the invention] This invention welsh speaker ,! ! The # relates to the
falsification of its diaphragm edge. Conventionally, the moving plate edge of the speaker is
shown in FIG. What is shown in FIG. 2 is used. That is, FIG. 1 shows a fixed edge. In this case, the
diaphragm (1) and the edge (2) are formed of the same material, and an appropriate amount of
damping stiffness is applied to the edge to obtain predetermined performance. (1) However, in
this case, mechanical deterioration of the edge portion is remarkable, and the influence of
ambient conditions, particularly humidity, is large, and there is a disadvantage that good
performance can not be maintained. FIG. 2 also shows a free edge, which is made by attaching a
material different from the diaphragm to the outer peripheral portion of the lifting plate (1) to
form the edge (2) and alleviating the above-mentioned mechanical degradation as a defect.
However, in this case, there was an adverse effect on the sound quality due to the radiation of
sound from the surface of the shell 1-di, and furthermore, there was a defect that nonlinear
distortion was likely to occur with respect to the driving force. In FIG. 3, which will be described
with reference to the drawings, (l) is a diaphragm of the speaker. (7) is an outer peripheral end of
the diaphragm, (3) is a ring-like elastic body fixed to the front surface of the outer peripheral end,
(4) is fixed to the rear surface of the outer peripheral end and the elastic body (3) It is a ringshaped elastic body for holding the outer peripheral end (7) of the moving plate. The elastic
bodies (3) and (4) are formed of the same material, and the outer peripheral end (7) of the
diaphragm (1) is sandwiched to form the moving plate edge (2) of the speaker. (5) is a frame of
the speaker (2)-, and a part thereof supports and fixes the-surface of the elastic body (4) of the
edge. (6) is a cover of the speaker, covering and fixing the-side of the elastic body (3) of the
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above edge. The outer wall of the edge (2) is not in contact with the frame (5) and the cover (6).
The operation of the edge (2) configured in this way will be described. When the imaging plate
(1) of the speaker lifts, the elastic bodies (3) and (4) of the edge (2) sandwiching the outer
peripheral end (7) of the imaging plate repeat expansion and contraction alternately. That is,
when the moving plate (1) moves in the direction of the arrow, the elastic body (3) is compressed
and the elastic body (4) is expanded. When the moving plate (1) moves in the opposite direction
to the arrow A, the elastic body (3) is expanded and the elastic body (4) is compressed, contrary
to the above. Since the elastic bodies (3) and (4) are formed of the same material in this
compression and expansion, the stress-distortion line with respect to the driving force by the S
motion becomes symmetrical, and the linearity of the speaker becomes good.
Further, since the edge (2) is configured as described above, there is no radiation of sound from
the edge portion (3); the sound quality can be improved, and high fidelity reproduction can be
achieved by reducing distortion. Also, there is no need to apply a damping agent to the edge. It
became 0 without mechanical deterioration
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