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Description 1, title of the invention
3. Detailed Description of the Invention In the present invention, flat frequency characteristics up
to a high frequency band can be obtained by using a high sound speed material as the diaphragm
material and adding a material with a large loss around it. The invention relates to a diaphragm
that is In general, it is desirable to use a lightweight, high-sound-speed diaphragm material as a
diaphragm material to widen the reproduction band of the speaker, and to use one having a
sufficient loss to obtain flat characteristics over the entire band. However, since there is no
material having a high sound velocity and sufficient loss as described above, there is a problem
that only an acoustic pressure characteristic having a resonance peak at high r can be obtained
as shown by a solid line in FIG. The present invention provides a diaphragm adapted to solve
such conventional problems. FIG. 1 shows an embodiment of the present invention. The surface
material 2.3 is pasted on both the front and back sides of the core material 1 of so-called ?)
having a large number of cells to constitute the diaphragm 4 and the end of the surface material
2.3 is extended and between them A material with large loss such as butyl rubber, semihardenable viscous rubber, semi-hardenable adhesive sheet, etc. is retained by a method such as
adhesion etc. 0 In this way, the diaphragm 4 itself has a high sound velocity, At the same time,
the loss in the vicinity of the diaphragm 4 is large, so that the loss of the diaphragm 4 is also
isometrically large. As a result, as shown by the broken line in FIG. In FIG. 2, the peripheral part
of the core 1 is replaced with the material 6 with a large loss. In this case, if heat-sealable foam
rubber t is used as the material 6, the material 6 is adhered to the surface material 2.3 when
constituting the diaphragm 4, and when the core material 1 is a nickel material. No nicks are also
adhered to EndPage: 1 material 6. The manufacture of the diaphragm 4 can be easily performed,
and chattering phenomenon due to the cut end of the honeycomb is eliminated, and the loss is
reduced by using 1 foam material. A large, lightweight diaphragm can be made. Fig. 3 shows that
edge 7 is made of a large amount of loss material. By holding a part of the edge 7 between the
end portions of the surface material 2.3, the increase in the loss of the diaphragm 4 and the
connection with the edge 7 are simultaneously realized. In FIG. 4, a material 6 with large loss is
provided in the peripheral portion of the core 1 and dumping between one surface 2 and 3 is
achieved by providing the material 5 between the ends of the surface 2.3. The In this way, an
action equivalent to the combination of the embodiment of FIG. 1 and FIG. 2 can be expected.
FIG. 5 further shows that the periphery of the surface material 2.3 is a curved surface.
As shown in FIG. 1 to FIG. When the periphery of the surface material 2.3 is bent, since the
longitudinal waves of the surface material 2.3 are partially reflected at the bent portion, the
longitudinal waves can not be sufficiently absorbed. On the other hand, if a single curved surface
as shown in FIG. 5 is used, the reflection of the longitudinal waves is reduced, so that the
longitudinal waves can be sufficiently absorbed and the loss can be increased by a factor of h.
FIG. 6 shows the material 5 of FIG. 6 integrally formed with an edge 7. It goes without saying that
corrugation or the like may be used as the core material in addition to the honeycomb. As
described above, according to the present invention, since the material of large loss is added
around the lightweight diaphragm to increase the loss of the diaphragm, it is possible to flatten
the sound pressure characteristic over a wide band. it can.
4, Brief description of the drawings 6.6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и attorneys patent attorneys Toshio Nakao other?
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