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JPS54163641

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS54163641
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a conventional speaker,
FIG. 2 is a half sectional view showing one embodiment of the speaker of the present invention,
FIG. 3 is an enlarged sectional view of the main part thereof FIG. 4 shows sound pressure
frequency characteristics of the conventional and inventive speakers. 14
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················································································ items , 25 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· voice coil, 29 · · · · · · · · magnetic gap.
DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to damp the reverse
resonance of the edge by providing an improvement to the edge to provide a speaker having a
stable sound pressure frequency characteristic. The conventional speaker is configured as shown
in FIG. That is, the frame 6 is coupled to the magnetic circuit 6 formed by arranging the ringshaped magnet 3 and the upper plate 4 on the plate 2 provided with the center pole 1, and The
peripheral edge of the edge 9 provided on the diaphragm 8 together with the gasket 7 is
adhesively bonded to the peripheral edge of the frame 60, 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 voice coil 10 is fitted into the magnetic gap 12 of the
magnetic circuit 6 without eccentricity, and a dust cap 13 is attached to the center of the upper
surface of the diaphragm 8. In this configuration, the edge 9 of the diaphragm 8 is made of a
flexible material such as cloth, rubber, or foamed resin, but it vibrates around a frequency that is
about 10 times the lowest resonance frequency fo. Photographed independently in the phase
opposite to that of the board 8, a large valley (dip) is generated in the mid range of the sound
pressure frequency characteristic as shown by the solid line in FIG. 4 by this reverse co-imaging,
and high fidelity reproduction is inhibited Was a major factor in The present invention seeks to
eliminate the above-mentioned conventional drawbacks. An embodiment of the present invention
will be described below with reference to FIGS. 2 and 3). Reference numerals 3 and 14 denote
12-05-2019
1
magnetic circuits. This magnetic circuit 14 includes a plate 16 provided with a center pole 15, a
ring-shaped magnet 17, The ring-shaped upper plates 18 are stacked and adhesively bonded. A
frame 19 is connected to such a magnetic circuit 14, and the peripheral edge of an edge 22
connected to the peripheral edge of the diaphragm 21 together with the gasket 2o is connected
to the peripheral edge of the frame 19 by an adhesive. The edge 22 is made of a cloth or nonwoven fabric impregnated with a flexible urethane or acrylic resin and sealed to form a seal
between the upper and lower edges 23.24 such as silicone grease, vinyl acetate copolymer,
acrylic ester, neobrene or the like. The material is filled with a substance 25 having appropriate
adhesiveness and visco-elasticity, and the diaphragm 21 is held on the inner circumference of the
upper and lower edge members 23.24, and the intermediate gasket 26 is held on the outer
circumference. 26 to prevent the outflow of the outside. A voice coil 27 is coupled to a central
portion of the diaphragm 21. The voice coil 27 is held at its middle portion by a tank τ ', and a
lower portion 28 of the magnetic circuit 14, of: 4τ · 1t,- 4) The magnetic gap 29 is fitted without
eccentricity.
Further, a dust cap 30 is attached to the center of the upper surface of the diaphragm 21. By this
configuration, when the edge members 23.24 on the edge 22 move in a mutually offset manner,
the adhesive and visco-elastic substance 26 generate friction loss to act as a large mechanical
resistance material, and vice versa Dampen the resonance completely. Therefore, large valleys
(dips) of the sound pressure frequency characteristic due to the edge reverse resonance which
tends to occur around 10 times the lowest resonance frequency fO can be completely eliminated,
and the flat characteristics as shown by the broken line in FIG. As described above, since the
speaker according to the present invention is configured, it is possible to damp the reverse
resonance of the edge which is likely to occur at a frequency near 10 times the lowest resonance
frequency to make the sound pressure frequency characteristics flat and stable. It has the
advantages of being able to do high fidelity reproduction, etc., and is of great practical value.
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