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JPS5663186

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DESCRIPTION JPS5663186
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a general
speaker, FIG. 2 is a cross sectional view of a roll edge of a conventional speaker, and FIG. 3 is a
cross section of the roll edge in an embodiment of the speaker of the present invention. FIG. 4 is
a sectional view of another embodiment, and FIG. 5 is a half sectional view showing a flat
diaphragm using the same roll edge. 5 ...... magnetic circuit, 6 ииииии frame, 8 ...... diaphragm, 9 .....
field - Ruetsuji, 10 ...... voice coil, 12 иииииииии Magnetic gap, 9a
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Dia. иии Small diameter roll, 9e и и и и и и и и и и и и и и
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a
roll edge, and an improvement is applied to this roll edge to prevent edge resonance and provide
a stable characteristic. In general, the speaker is configured as shown in FIG. 1). That is, the
frame 6 is coupled to the magnetic circuit 5 constituted by the plate r 2 having the center pole 1,
the ring-shaped magnet 3, and the ring-shaped / i / not 2-top plate 4. The peripheral portion of
the roll edge 9 coupled to the diaphragm 7 together with the gasket 7 is fixed to the portion, the
voice coil 10 is coupled to the central portion of the diaphragm 8, and the intermediate portion
of the voice coil 10 is held by the damper 11 The lower portion of the coil 10 is fitted into the
magnetic gap 12 of the magnetic circuit 5 without eccentricity, and the dust cap 13 is attached to
the central upper surface of the diaphragm 8. In this configuration, the roll edge e is formed of
cloth 2 and paper 2 molt blen, urethane foam, rubber, etc. However, as shown in FIG. 2, the
conventional roll edge 9 is provided with a sticking portion 9a to the frame 6 on the outer
periphery. The roll portion 9b is provided on the inner side, and the sticking portion 9C to the
diaphragm 8 is provided on the inner periphery of the roll portion 9b. In particular, since the roll
portion 9b and the sticking portion 9C are formed to be bent at an acute angle, the inner
periphery of the roll portion 9b has a large mechanical strength, and the vibration of the
diaphragm 8 is 2 to, i7 The follow-up is performed at the central part of part 9b 32 and both
ends of the roll part 9b are large, Q is large and peaks and dips occur in the middle range, and
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1
the characteristics become unstable. There was a drawback. The present invention eliminates the
above-mentioned conventional drawbacks. Hereinafter, an embodiment of the present invention
will be described with reference to FIGS. The configuration of the entire speaker is the same as
that of FIG. 1, and here, since it is characterized by the configuration of the roll edge, only the roll
edge will be described. First, FIG. 3 shows a roll edge 9 formed of cloth 2 and paper 2 molt brene,
urethane foam, rubber and the like. This roll edge 9 has a portion 9a to be attached to the frame
6 at its outer peripheral portion and a roll portion 9b1 at its inside. Inside the roll part 9b, a
small diameter roll part 9d of 1?4 to 1/16 of the roll part 9b protruding in the opposite direction
to the roll part 9b is provided, and inside the roll part 9d, -S. The attachment portion 9C with the
diaphragm 8 is provided, and the near 7 pliers and s of the inner circumference of o-z and s9b
are enlarged to increase Q, and the resonance from the diaphragm 8 is reduced. --- It is an
attempt to prevent the edge resonance.
Further, in the case shown in FIG. 4, in place of the small roll portion 9d, a hook-like protruding
portion 9e is provided, and the purpose is the same as that described above. Further, FIG. 6
shows an example in which the roll edge 9 shown in FIG. 3 is attached to the flat diaphragm 14.
As described above, the speaker according to the present invention is structured so as to increase
compliance by providing the small roll portion and the ridge-like protruding portion on the inner
peripheral portion of the roll essino roll portion, so that the generation of the edge resonance can
be prevented, The pressure frequency characteristics can be made flat and stable over the entire
area, and the weight as an edge can not be increased. <It is possible to increase the compliance,
and it is also possible to lower the lowest resonance frequency. It will be
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