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JPS5764990

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DESCRIPTION JPS5764990
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are sectional views of a loudspeaker
having a mechanical filter, and FIGS. 3a and 3b are sectional views showing a sub-edge of a
conventional loudspeaker, and FIGS. FIG. 2 is a cross-sectional view of a sub-edge used in the
speaker of the present invention. 1 и и и Main diaphragm, 2 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
2nd damper, 5 и и и 1st damper , 6 и и и и и и A plate и 7 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
voice coil bobbin, 10 и и и voice coil, 11 и и и Sub diaphragm 12, 12 Sub edge 16, foam urethane
sheet 17, cloth. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker in
which the vibration of a voice coil bobbin is transmitted to the main diaphragm through the sub
diaphragm and its edge, which reduces the rolling of the main and sub diaphragms and the voice
coil. It is an object of the present invention to reduce the gap rubbing of the voice coil and at the
same time to prevent the mechanical destruction of the edge (hereinafter referred to as a subedge) of the auxiliary diaphragm. 2 Figure 1 shows a planar filter equipped with a mechanical
filter 2 ---! FIG. 2 is a cone speaker equipped with a mechanical filter, all of which were
previously presented by the same applicant as the present invention. In FIG. 1 and FIG. 2, 1 is a
main diaphragm, 2 is an edge of the main diaphragm, -3 is a frame, 4 is a second damper s5 is a
1g1 damper, 6 is a magnet plate, 7 is a magnet, 8 is a B plate , 9 is a voice coil bobbin, 10 is a
voice coil, 11 is a sub diaphragm, and 12 is a sub edge. Further, 13 in FIG. 2 is a lid 1- for sealing
the upper end of the bobbin 9 and 14 is a dust cap. Since the speakers of FIGS. 1 and 2 are
different in shape but substantially the same in operation principle, the operation will be
described only for the flat speaker of FIG. 1 below. First, the force generated by the voice coil 10
picks up the sub-diaphragm 11 via the bobbin 9, and this force is the main diaphragm 1. Sub
diaphragm 11. Only the low frequency component is transmitted to the main diaphragm 1
through the compliance (spring property) of the air chamber surrounded by the sub-edge 12, and
is emitted as an acoustic wave to the outside world. At this time, if the air chamber is sealed, the
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sub- ░ ииииииииииииииииииииииииии With the voice coil bobbin 9 together with the first damper 6 to prevent
rolling of the bobbin 9 It has a role of keeping the center firmly in place. For this purpose, it is
desirable to use a thick urethane foam (for example, one obtained by heat-press molding a
urethane foam resin to a thickness of about 1 mm) having high sealing performance and central
retention as the sub-edge. However, such sub-edges made of urethane foam have the following
disadvantages. Since the 1- (1) material thickness is large, the tensile stress applied to the bent
portion at the time of bending the edge is large, and a crack is easily generated on the surface of
the bent portion. Therefore, there is a possibility that the edge may be destroyed at the time of
large continuous input. . (2) The urethane urethane edge has a large center retention but is weak
against tension, and when momentary "sluggish" occurs, the bobbin is inclined to one side due to
the variation of the circumferential extensibility of the edge, and the gear knob L) It is easy to
make rubs.
The present invention is to provide a speaker having a sub-edge 4-7: which has the abovementioned disadvantages. FIG. 3 (a) is a cross-sectional view of the roll portion of the urethane
foam sub-edge 12. As shown in FIG. In order to provide central holding power, a foamed
urethane sheet having a thickness of about 10 ? as compared with a normal edge is formed into
a roll having a thickness of about 1 ? by heat pressure molding. Now, when a large input is
applied to this sub-edge 12, the sub-edge 12 is displaced as in the third [1) 1 by the displacement
of the sub-diaphragm 11, and mechanical failure occurs at the position shown by 16. 1D Then, as
shown in an example in FIG. 4, if the cloth 17 is adhered to the lower side of the urethane sheet
16 and molded, even if the urethane sheet 16 is cracked, the cloth 17 is broken because it is
present. You can get rid of it. Further, as shown in FIG. 6, if the cloth 17 is adhered to both sides
of the urethane sheet 16, the breakage can be prevented more completely, and the center
holding ability of the urethane, the bending resistance and the tensile resistance of the cloth can
be obtained. It has a good point, and it is almost ideal as a sub-edge. ,-: = Can get the nature. This
property is Ureta "?" Only the 5417 sheet or the cloth, which can not be obtained,-/ 5,... And the
opening can be achieved only by simultaneously pressure-bonding the both at the time of
molding. Needless to say, not only urethane but also other foamed resin having the same effect
may be used. As described above, since the present invention uses the sub-edge in which cloth is
bonded to one side or both sides of the foam resin to connect the sub-diaphragm and the main
diaphragm, the center holding power is large and the bending resistance is high. By the sub-edge
excellent in tensile resistance, it is possible to constitute a speeding force without loading.
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