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JPS5788394

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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 JPS5788394
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a conventional speaker,
FIG. 2 is a sound pressure frequency characteristic diagram of the same speaker, FIG. 3 is a half
sectional view showing another conventional speaker, FIG. FIG. 5 is a half sectional view showing
one embodiment of the speaker of the present invention, FIG. 5 is a sound pressure frequency
characteristic diagram of the same speaker, and FIG. 6 is a half sectional view of the speaker of
another embodiment. 13 ииииии Magnetic circuit, 18 ииииииии Magnetic gap, 19 ииииии Voice coil, 20.26 ииииииии
Diaphragm, 21.27 иии и и и и и и и и и и и Damping material. ? 3-7-1 32 Figure 5 afllllu'y NI # fatZt
EIIIIitll) Figure 4 2 '/. /// sheet; 15j Fig. 6-232 '7' 21; / l '// "1716" 15
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker whose
characteristics are stabilized by improving the bonding structure of the peripheral portion of a
diaphragm. In the prior art, the loudspeakers shown in FIGS. 1 to 3 are constructed as shown in
FIG. 1. First, the loudspeaker shown in FIG. 1 is a plate 2 having a dovetail IL / 1, ring-shaped
magnoton ii / -t23, the periphery of the dome-shaped diaphragm 6 is bonded to the horizontal
upper surface of the upper plate 4 of the magnetic circuit 5 similarly constituted by the ringshaped upper plate 4 by bonding or the like, and this dome-shaped diaphragm 6 ((The voice coil
7 is connected to the magnetic gear knob 8 of the magnetic circuit 5 and the voice coil 7 is fitted.
According to this configuration, as shown in the sound pressure frequency characteristic diagram
of FIG. 2, the resonance and antiresonance of the peripheral portion (edge portion) of the
diaphragm 60 at a frequency of 7 to 10 times the lowest resonance frequency (jo) of the
reproduction band. There is a drawback that a large disturbance is caused and a flat
characteristic can not be obtained. The one shown in FIG. 3 is coupled to the magnetic circuit 5
and the gasket 10 is attached to the flat portion of the periphery of fc7V-A9. And the voice coil 7
is coupled to the central portion of the diaphragm 11, and the intermediate portion of the voice
coil 7 is held by the dampers 1 and 12 to The magnetic portion of the magnetic -9 circuit 5 is
composed of a magnetic gear 81). In this configuration, the driving force generated by the voice
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coil 7 is transmitted to the peripheral portion of the diaphragm 110 through the diaphragm 11,
and is transmitted to the coupling portion with the frame 9 without being braked by all the VC
'7Q. As a result of this phase difference between the reflected wave and the traveling wave, there
has been a drawback that distortion of the sound pressure wave number, called enon reverse
resonance, occurs mainly at mid frequencies. The uninvention eliminates the above-mentioned
conventional drawbacks. Hereinafter, an embodiment of the present invention will be described
with reference to FIGS. 4 to 6, but the embodiment shown in FIG. 4 will be described. The
reference numeral 13 denotes a magnetic circuit, and the magnetic circuit 13 is constituted by a
plate 15 having a ten pole 14, a link-like magnet 16, and a link-like upper break 117 as well. A
voice coil 19 is fitted in the magnetic cap 18 of the magnetic circuit 13 and is connected to the
voice coil 19 \ dome shaped diaphragm 20. S и Edge portion 21r of the peripheral edge of the
diaphragm 20 (upper part). Coupled to the top of rate 17. The coupling portion 22 of the edge
21 of the -L portion blade 17 is an inclined surface which is lowered at the center side, and the
coupling portion 22 of this inclined surface is made of foam rubber or foam so that the inclined
surface is horizontal. A damping material 23 having sufficient mechanical loss and flexibility such
as resin is fixed, and an edge 21 is bonded to the horizontal upper surface of the damping
material 23 by bonding or the like.
With this configuration, the damping member 23 has a large mechanical loss at the large
diameter inner diameter portion and a mechanical loss smaller at the outer diameter side, so that
the speed of vibration transmitted at the edge portion 21iC of the diaphragm 2o is reduced. At
the reflection end, the edge resonance and the edge antiresonance are eliminated, and a flat
sound rIE frequency characteristic as shown in FIG. 5 can be obtained. In the embodiment shown
in FIG. 6, a ring-shaped sticking base 25 having a thin inner diameter side is connected to the
frame 240 connected to the honeycomb circuit 13 and the soft foam resin is placed on the
sticking base 26. A damping material 23- is disposed with sufficient mechanical loss and
flexibility such as foam rubber, visco-elastic material, etc. The horizontal upper surface of the
damping material 23 is an edge of the coin-shaped diaphragm 26. 27 are bonded together. A
voice coil 19 is coupled to the central portion of the diaphragm 26, and the lower portion of the
voice coil 19 is held by an intermediate portion battamper 28 so that the lower portion of the
voice coil 19 is fitted to the magnetic gear knob 18 of the magnetic circuit 13 without
eccentricity. Also, on the central upper surface of the diaphragm 26, a thrust cap 29 is attached.
Due to this configuration 53I: the vibration transmitted to the edge 27 is gradually reduced from
the initial large braking force because the thickness is smaller on the outer peripheral side than
the inner periphery of the damping material 23, and the vibration or damping is almost damped
at the outermost periphery. As a result, matching of the mechanical impedance is smoothly
performed, and the non-reflecting end becomes almost non-reflecting edge, and it is possible to
eliminate the edge resonance or eliminate the disturbance in the middle range of the sound liE
frequency characteristic to make the sound lf frequency characteristic flat. As described above,
since the ring portion of the diaphragm is connected to the horizontal surface of the damping
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material which becomes thicker on the inner circumferential side 11 in the tree 8 Ц speaker, the
vibration 6 transmitted to the edge portion is effectively damped. The generation of the edge
resonance can be prevented, and the sound pressure frequency characteristic can be made flat
and the practical value is increased.
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