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JPS59194598

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DESCRIPTION JPS59194598
[0001]
TECHNICAL FIELD The present invention relates to a speaker, and more particularly to
improvement of sound pressure frequency characteristics of an electrodynamic speaker.
Configuration of Conventional Example and Problems Thereof-In recent years, in an
electrodynamic loudspeaker having a dome shape, the dome portion has been made smaller and
the edge portion has been made larger in order to measure the effective use of the field portion.
A conventional electrodynamic speaker will be described below with reference to FIG. 1 is a
diaphragm in which a dome portion 1a and an edge portion 1b connected to the dome portion 1a
are integrally molded with a resin material to a uniform thickness; 2 is a voice coil attached to
the diaphragm 1; 3 is a magnet; Plates A and 6 fixed to the upper part of the magnet 3 are plates
B fixed to the lower part of the magnet 3 and 6 is a frame for fixing the edge portion 1b of the
diaphragm 1 to the plate A4. The operation of the conventional electrodynamic speaker
configured as described above will be described below with reference to FIG. First, at a frequency
below the resonance frequency of the edge portion 1b, since the dome portion 1a and the edge
portion 1b driven by the voice coil 2 move integrally, no disturbance occurs in the sound
pressure frequency characteristic. However, at the resonance frequency point of the edge portion
1b, a large dip and peak occur in the sound pressure frequency characteristic because the edge
portion 1b moves differently from the dome portion 1a due to resonance. In particular, since this
resonance frequency is generally in the audible range, the above-described electrodynamic
speaker is required for a Hi-Fi speaker requiring high fidelity because the edge portion 1b is
larger than the dome portion 1b. There was a problem that I could not use it. SUMMARY OF THE
INVENTION The present invention solves the above-mentioned conventional problems, and
provides an electrodynamic speaker which can suppress resonance at an edge portion and
smooth sound pressure frequency characteristics. The present invention has a curvature larger
than that of the convex dome portion in the hemisphere and the convex dome portion in the
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hemisphere provided on the circumferential portion thereof, and integrally integrates the convex
portion in the hemisphere with the resin. Electrokinetic using a diaphragm in which a convex
resin molded body in a sphere is adhered to the surface outer peripheral portion from the
surface central portion of the hemispherical hollow convex edge portion and having the same
curvature as that of the convex edge portion. Type speaker, which is capable of preventing
resonance at a specific frequency and improving sound pressure frequency characteristics by
changing the compliance of the convex portion in the hemisphere and dispersing the resonance
frequency. DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described with reference to FIG. In FIG. 3, the diaphragms 1.1a, 1b, 2, 3, 4, 5
and 6 are the same as those shown in FIG.
Dome part, edge part, voice coil, macnet, plate A, plate B, frame. And 7 is a resin molding which
has the same curvature as the edge portion 1b and is bonded to the surface outer peripheral
portion from the surface central portion of the edge portion 1b. The operation of the
embodiment configured as described above will be described below. First, at a frequency below
the resonance frequency of the edge portion 1b, the sound pressure frequency characteristic is
not disturbed because it moves integrally with the dome portion 1a as in the conventional
example. Next, at the resonance frequency point of the conventional edge portion 1b, since the
resin molded body 7 is adhered to the edge portion 1b, the compliance of the edge portion 1b
becomes uneven, so that resonance does not occur. The resonance is dispersed between the
guttered portion and the non-adhered portion so that the resonance is dispersed. Therefore, it is
possible to obtain a smooth sound pressure frequency characteristic in which no dip or peak
occurs in the entire band within the audible range of the sound pressure frequency
characteristic. As described above, according to the present invention, the resin molded body is
adhered to the edge portion, the compliance of the edge portion is changed, and the resonance
frequency is dispersed, thereby preventing the resonance at a specific frequency, all over the
audible range. Excellent effects can be expected in the improvement of sound pressure frequency
characteristics in the band.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a structural cross-sectional view showing a conventional electrodynamic speaker, FIG. 2
is a sound pressure frequency characteristic diagram of the same speaker, and FIG. 3 is a
structural cross-sectional view showing one embodiment of the electrodynamic speaker of the
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present invention FIG. 4 is a sound pressure frequency characteristic diagram of the same
speaker.
1 ··················································································· Voice coil, 3 ·········· , 4.5 · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · molded resin body. Name of Agent Attorney Nakao Toshio has 1 person Figure 1 f
Figure 2 Figure 3 Figure 4 595-
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