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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm of a speaker. [Technical Background of the Invention and Problems Thereof] A
speaker having a diaphragm having a structure as shown in FIG. 1 (a) and (b) is known as one of
the flat type speakers (ии ? 11) In FIG. 11, 1 is a diaphragm, 2 is a voice coil bobbin, 3 is a voice
coil, and 4 is an edge. The diaphragm 1 is formed by molding a foam such as rubber or plastic
thread and has a suitable mechanical loss 4 when the diaphragm is freely vibrated, as shown in
FIG. 2 (a). (11) has natural vibration modes in the nodal direction and radial direction, but by
driving the portion (broken line) corresponding to the nodal mode node of the moving plate as in
(b) , To the frequency corresponding to the mode (11) can be reproduced in a state close to the
piston vibration. However, there is a limit to further broadening the frequency band without
significantly reducing the efficiency. OBJECTS OF THE INVENTION It is an object of the present
invention to provide a loudspeaker diaphragm which has adequate mechanical losses and is
capable of reproducing a sufficient frequency band of piston vibration. SUMMARY OF THE
INVENTION In order to solve the above-mentioned problems, the present invention uses CFRP
(carbon fiber reinforced plastic) in a diaphragm made of rubber or plastic foam. GFRP (glass fiber
reinforced plastic), etc. By embedding a part or the whole of the grid-like rib made of the high
elastic filler material in the foam and molding it, it is possible to regenerate a sufficiently wide
piston vibration 1 wave number band with appropriate mechanical loss. The . DETAILED
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in
detail with reference to the embodiments shown in the drawings. FIG. 3 shows an embodiment of
the invention in which the frequency band is broadened without lowering the efficiency so much.
FIG. 3 (a), t: j is a plan view, and FIG. As shown in FIG. 9A, which is a cross-sectional view at 9 ░,
the speaker diaphragm of the present invention comprises a diaphragm 1 made of foam, such as
Ch'ap (carbon fiber reinforced plastic), GF) 1. A grid-like rib 5 made of a highly elastic material
such as P (glass fiber reinforced plastic) is embedded. This grid rib 5 has a combined shape of the
diaphragm 10 in the circumferential direction and the radial direction. (Effects of the
Invention) According to the speaker diaphragm of the present invention, the following effects
and effects can be obtained. . In the characteristic a of FIG. 4, the loudspeaker diaphragm of the
present invention, which is reinforced by the grid-like rib 5 of CFILP as shown in FIG. Similarly to
the comparative example which is the sound pressure response when driven in the
corresponding part, the diaphragm made of the foamed rubber of diameter 20 crn-having no
grid-like rib as in the present invention is similarly Characterize sound pressure response when
driving a part corresponding to a clause
As can be seen from this figure, as in the present invention, by using a circumferentially and
radially reinforced diaphragm, it has adequate mechanical loss and does not reduce efficiency
considerably. A wide, four-piston frequency band can be regenerated. Further, in the
conventional example as shown in FIG. 1, as can be seen from the characteristics in FIG. 4, it is
possible to produce small valleys at frequencies corresponding to mode (a) and mode (C) in FIG.
Certain one, this is because the divided vibration of mode (a) and mote charge C) can not be
suppressed sufficiently, and it is not remarkable in the frequency characteristic but has an
influence on the sound quality. In the embodiment as shown in FIG. 3, the diaphragm 1 is
reinforced in the circumferential direction, and it has a composite structure, as shown in FIG. The
characteristic valleys are further reduced at frequencies corresponding to the motes b) and mode
(C), and the B-colored color tubes are reduced. . It is also possible to embed it. In the embodiment
of FIG. 3, the lattice rib 5i / ? ? is not hollow, but is hollow, but it can be lightened by the lever
11 to reduce the low efficiency F completely.
Brief description of the drawings
FIG. 1 shows a conventional flat diaphragm, FIG. 2 shows its resonant frequency mode, FIG. 3
shows one embodiment of the flat diaphragm of the present invention, and FIG. 4 shows the
present invention FIG. 8 is a frequency characteristic diagram of a conventional speaker vibration
IJl plate. .
1 и и Diaphragm, 2 и и Voice coil и Bobbin, 3 и Voice coil 4 и и Edge, 5 и и и Ribbed grid ,. Lee (? how
many people IP FB !! -4- It It; ? $ Buddha (14? > + A) Fig. 1 (?) (b) Fig. 2 (e) Cf ('j) U,) (cL) (?)
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