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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a part of a
diaphragm of a speaker using a sintered metal according to the present invention (FIG. 2) a part
of a diaphragm using a sponge-like metal FIG. 3 is a cross-sectional view showing a modified
example of the diaphragm shown in FIG. Explanation of symbols of the main parts, 1 ..... vibration
plate, 2 ... metal, 3 ... viscoelastic material, 4 ... supporting member.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker, and in
particular to a diaphragm of the speaker. As a conventional metal diaphragm, there are one in
which the metal sheet itself is formed, one in which a material other than the metal is
sandwiched between the metals in order to increase the internal loss, and one in which fibrous
metal and pulp are mixed. . However, they all have the following disadvantages. First, in the case
of a sandwich type diaphragm, it was difficult to process the periphery of the manufacturing
process and to bond the metal to another material. In the case of the type using the mixed paper
material, points such as entanglement between metal and pulp were not taken advantage of the
characteristics of metal. Historically, these diaphragms could not be used as half-spacers because
of their low bending stiffness. -2 + The purpose of the present invention is to provide a
loudspeaker which eliminates such drawbacks. The invention will now be described with
reference to the embodiments shown in the drawings. FIG. 1 shows a cross-sectional view
showing a part of the diaphragm 1 of the speaker according to the present invention. The
diaphragm l is composed of a porous metal, for example, a sintered metal 2 and a visco-elastic
material 3. The viscoelastic member 3 is filled between the metal particles 5 of the metal 2. As
the visco-elastic member 3, butyl rubber or polyurethane is suitable. 0 In FIG. 2, a spongy metal
is used as the metal 2. The viscoelastic material 3 is filled in the metal 2 at Q as in the first
illustrated diaphragm. A modification of the diaphragm of FIGS. 1 and 2 is shown in FIG. 3, and a
sandwiching member suitable for metal 2 (a sponge-like metal is shown in the figure but may be
a sintered metal) A phrase inserted at a predetermined interval between four. As the visco-elastic
material, one having fluidity can also be used 3, and in this case, a holding member as shown in
FIG. 3 is adhered to prevent outflow. Of course, in such a case, the metal 2 must be filled between
the holding members. As the holding member, the same applies to the embodiment shown in FIG.
3 but paper, metal or carbon-filled p plastic or the like is used. As described above, since the
diaphragm of the speaker according to the present invention has a porous metal, its bending
strength is high and its rigidity is high, so that it can be used as a flat shape which easily
generates resonance as well as a cone shape. . In addition, since the vibration energy is absorbed
by the viscoelastic material filled in the gold chicken, it is possible to flatten the sound pressure
and the frequency characteristics, and the like.
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