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JPS57148496

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DESCRIPTION JPS57148496
1。 Description 1, title of the invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer in which the adhesive strength between a diaphragm and an edge is increased.
Conventionally, when the diaphragm is attached to the frame via an edge in an electroacoustic
transducer such as a speaker, as shown in FIG. 1, only one of the outer surface and the back
surface of the diaphragm 1 is used for the edge 2. In this case, when the diaphragm 1 is largely
displaced in the direction of the arrow in FIG. 1 in this case, the diaphragm 1 and the diaphragm
2 are attached. There is a problem that the edge 2 is easily peeled off because a large peeling
force acts on the adhesive surface of the die 2. The present invention provides an electroacoustic
transducer that solves such conventional problems. An embodiment of the present invention will
be described below with reference to FIGS. 2 and 3. The inner circumferences of two edges 4 and
6 are adhered to the front and back sides of the outer circumference of the diaphragm 1, and the
outer circumferences of the respective edges 4 and 6 are adhered to the front and back of the
frame 3, respectively. It is In this way, even if the diaphragm 1 moves in either the B or C
direction, not only the peeling force but also the shearing force acts on the bonding portion
between the edges 4 and 6 and the diaphragm 1, and therefore it is extremely peeled off. Do.
That is, when the diaphragm 1 is largely displaced in the direction of arrow B (front direction) as
shown in FIG. 3 and the edge 4 on the front side is moved to the hanging position, the peeling
force in the third direction is applied to the edge 6 on the front side. Although it works, a shear
force in the direction of FIG. 3E acts on the edge 4 on the front side. Generally, the adhesive
strength is larger in shear force than peel force, so in the state of FIG. 3, almost no peel force acts
on edge 6 on the back side, and only shear force of pressure wedge 4 on the front side works.
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For this reason, the bonding strength between the diaphragm 1 and the edges 4 and 6
corresponding to EndPage: 1 is dramatically improved to a large amplitude as compared with the
original one. Of course, when the diaphragm 1 is displaced in the direction of arrow C in FIG. 2
and the edge 5 on the back side is suspended, the shear strength of the edge 6 on the back side
becomes dominant as well, so the edge 4 on the cloth side Can be prevented from peeling off.
The inner circumferences of the two edges 4 and 6 may be bonded to the front and back surfaces
of the diaphragm 10 as shown in FIG. . The movement board 1 may be a cone type as shown in
FIG. Still Figure 4. As shown in FIG. 6, only the inner peripheries of the two edges 4 and 6 are
separated and attached to both the front and back sides of the outer periphery of the diaphragm
1, and most of the remaining parts are attached to the frame 3 For example, in combination with
the increase in the strength of the edge itself, the strength against tearing and the like
significantly increases, and the productivity also improves.
Also, the edges 4 and 6 may be corrugated as shown in FIG. As described above, according to the
present invention, the edge is adhered to the front and back flats of the outer periphery of the
diaphragm, and the diaphragm is supported by these two edges, so that the invention works on
the bonded part of one edge. The peeling force exerted on the bonding portion of the other edge
by the shearing force can be suppressed to surely prevent the peeling of the edge. Therefore,
particularly when applied to a speaker driven with a large amplitude like a driver of a speaker
system provided with an acoustic filter, a high input resistance can be realized with a very simple
configuration.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of the main part of the prior
art, FIG. 2 and FIG. 3 are cross-sectional views of the main part of one embodiment of the present
invention and FIG. 6 to 6 show the second embodiment of the present invention. It is principal
part sectional drawing of a 4th Example. 1 ······ Diaphragm, 3- ···· Frame 45 ··· Edge. Name of agent
Attorney Nakao Toshio and others 1 person Figure 1 Figure 2 Figure 311 fourth! 1 Fig. 5 Fig. 6
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