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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional front view of the main part of
a conventional speaker, FIG. 2 is a cross-sectional front view of a speaker in one embodiment of
the present invention, FIG. FIG. 4 is a characteristic view of the same speaker, and FIGS. 5, 6 and
7 are sectional front views of the main parts of the speaker in the embodiment of the same place.
4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · visco-elastic thin film.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of
the speaker O edge portion, and is intended to improve the linearity with respect to vibration and
to reduce the distortion at the time of large amplitude. The edge connecting the speaker
diaphragm and the frame generally requires the following performance. (1) Non-linear distortion
force smaller than upper and lower vibrations. (2) There is a braking effect. (3) There is no
breathability. (4) Be lightweight. \2? 0 and FIG. 1 show an example of a conventional speaker,
in which a diaphragm 5-1 and a frame 2 are connected by an etch 3. As the material of the edge
3, a sheet of urethane foam 9 and a cloth impregnated with a viscoelastic material are used.
However, the edge using paper does not satisfy the above conditions (1) and (3), and a speaker
with good characteristics can not be obtained. On the other hand, 7 mm of foam urethane or
cloth impregnated with a viscoelastic agent does not satisfy the above conditions (1) + (4).
Therefore, the present invention attempts to capture a speaker that can satisfy all the above two
conditions. An embodiment of the scheme will be described with reference to the drawings. As
shown in FIG. 2 and FIG. 3, the diaphragm 4 and the frame 6 are connected by a coil spring 6
coated with a visco-elastic agent in a plurality of cylinders. Then, the entire periphery between
the diaphragm 4 and the frame 50 is covered with a viscoelastic thin film 7 such as butadiene
rubber. In this construction, the relationship between the displacement of the edge and the stress
is better linearity in the present invention as shown in FIG. A in FIG. 4 is that of the present
invention, and B is that of the prior art. What is shown in FIG. 6 is another embodiment, in which
a spring 62-) and a visco-elastic thin film 7 are vertically provided. What is shown in '31, 'le and
FIG. 7 is an object using a plate spring 8'. As described above, according to the present invention,
by using both a spring coated with a visco-elastic agent and a visco-elastic thin film as an edge, a
linear distortion is small, a damping action is also provided, and a non-breathable and lightweight
condition is added. A speaker can be obtained.