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Description of the Invention Speaker 1 In a speaker comprising a composite diaphragm in which
skin materials are attached to both sides of a core material having relatively rough end faces, the
end face of the core material and the peripheral portion of at least one skin material A speaker,
wherein a flexible edge member is joined so as to be joined, and the diaphragm is held by the
frame through the edge member.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement
of a speaker using a composite plate as a diaphragm, and in particular, a novel device is applied
to the processing means of the peripheral end face of the diaphragm. First, prior to the
description of the present invention, the main part structure of a loudspeaker of this type will be
outlined with reference to FIG. In the figure, (1) is a known speaker frame, (2) is a cone-shaped
composite diaphragm housed in the frame, (3) is a center cap, and (4) is an opening peripheral
portion of the diaphragm (2). The flexible edge member to be held, (5) indicates an edge press
ring referred to as so-called arrow paper, and the diaphragm (2) of this example has skins (2b) on
both sides of the core material (2a) made of foamed plastic or the like. And (2b) (aluminum foil,
beryllium foil, titanium foil, carbon fiber, and other various sheets) are applied as a composite
plate, and such a composite diaphragm (2) itself is already known. There is. That is, this is based
on the intention of improving the flexural rigidity of the diaphragm to improve the frequency
characteristics of the speaker (in the case of the woofer-in the middle and high range), and a
considerable effect in practice. It is widely accepted that they can play. However, on the other
hand, there are various problems that require technical solutions when the speaker unit (or cis
EndPage: 1 rubber) is to be configured by the above-mentioned composite diaphragm (2). Among
them, the processing means for processing the peripheral end face of the diaphragm (2) is one
problem, and in the illustrated example, the outer peripheral surface of the opening of the coneshaped diaphragm (2) is supported by the edge member (4). '' Is not only exposed to the original
characteristics of the composite diaphragm, but also generates abnormal noise such as so-called
flicker, or the core material due to aging. It is not possible to avoid the inconvenience such as
exfoliation with the double-sided skin. The present invention has been made in view of the
foregoing points, and the object of the present invention is to propose a simple and novel means
capable of eliminating the above-mentioned defects in the treatment of the peripheral end face of
the composite diaphragm. It is to be.
The detailed description of the present invention will be made with reference to FIGS. 2 to 5
below. FIG. 2 is a longitudinal sectional view of the main part showing an example thereof, and
the corresponding parts to FIG. In the present invention, for example, the cross section of the
inner peripheral edge of the flexible edge member (4) (the material is usually urethane foam or
rubber, etc.) is formed in a U shape in the present invention. This part is a holding part (6), and
the peripheral part of the composite diaphragm (2) is inserted in the holding part (6) by pressure
and pressure, and the back end of the U-shaped holding part (6) The end face (2 ') of the
diaphragm is brought into close contact, and the fitting portion is joined, for example, with a
resin adhesive, thereby covering the peripheral portion including the end face (2') of the
composite diaphragm (2) . That is, it is well confirmed by experiments of the present inventors'
group that the frequency characteristics of this type of speaker are significantly improved as a
result of applying such end face processing, and the generation of a pippy noise and the change
with time as in the past. Almost no skin peeling was observed. Fig. 4 shows an example in which
the core material of the composite diaphragm (2) of the cone-shaped speaker is a honeycomb
plate (2a '), and the pleated holding plate is extended from the back center of the holding portion
(6) of the edge member (4). The acoustic characteristics of the diaphragm attached to the skin on
both sides of the honeycomb core plate belong to a well-known matter, and the function and
effect of this embodiment are substantially the same as those of the previous embodiment.
Further, FIGS. 4 and 5 show an embodiment in which the present invention is applied to a flat
plate type speaker, and the same reference numerals are given to the corresponding parts to the
example of FIG. 2 and the example of FIG. Therefore, in FIG. 4, the inner peripheral edge of the
edge member is made an L-shaped receiving portion (7), and this receiving portion (the force is
joined to the peripheral end face (2 ') and the lower surface of the flat composite diaphragm (2)
FIG. 5 shows the case where the end face (2 ') of the diaphragm (2) is inserted and joined in the
same U-shaped sandwiching portion (6) as in FIG. Even if invention is given, the processing effect
is very large. Thus, according to the present invention, in each type of loudspeaker provided with
a composite diaphragm, it is possible to almost eliminate the above-mentioned conventional
drawbacks, and thus it is of course possible to improve the characteristics of this type of
loudspeaker. Bring about a practically excellent effect including skin peeling prevention and the
like based on time-dependent change.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an essential
part for explaining an example of a loudspeaker using a diaphragm made of a composite plate,
and FIGS. 2 and 3 are an essential part of a cone type loudspeaker to which the present invention
is applied. And FIG. 4 and FIG. 5 are principal part longitudinal cross-sectional views which show
the example which gave this invention to the flat plate type | mold speaker. (1) is a frame, (2) is a
composite diaphragm, (2a) and (2a ') is a core material, (2b) is a skin, (2') is an end face, (4) is an
edge member, (6) is The U-shaped holding part, (7) is an L-shaped receiving part. EndPage: 2 Fig.
2 '@ 4 Fig. 5 JO' 7 EndPage: 3
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