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JPS5782790

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5782790
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
speaker, FIG. 2 is a cross-sectional view showing an embodiment of the speaker of the present
invention, and FIG. 3 is an electrical impedance characteristic of the conventional and the
speaker of the present invention. FIG. 4 is a sound pressure-frequency characteristic diagram of
the speaker according to the prior art and the present invention. 13 · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Ring, 18 ... Frame
... 30, ... ... Diaphragm, 21 ... ... Voice coil, 22 ... ... Damper, 23 ... ... Magnetic gap.
DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to provide a speaker
with improved sound pressure-frequency characteristics by modifying the internal magnetic type
magnetic circuit. The conventional speaker is configured as shown in FIG. 4-8, that is, the
laminated body of the magnet 2 and the upper plate 3 is combined in the U-shaped yoke 1 to
form the magnetic circuit 4 of the internal magnetic type 2, and the frame 6 is coupled to the
yoke 1 The peripheral edge of the diaphragm 70 is adhered to the peripheral edge of the frame 5
together with the gasket 6 by bonding or the like, the voice coil 8 is coupled to the central part of
the diaphragm 7, and the middle part of the voice coil 8 is The lower portion of the voice coil 8 is
held and inserted into the magnetic gap 10 of the magnetic circuit 4 without eccentricity, and the
dust cap 11 is attached to the central upper surface of the diaphragm 7. The upper plate 3
stacked on the magnet 2 of the magnetic circuit 4 in the above configuration is formed to have a
diameter larger than that of the macnet 2, and the peripheral portion of the bonding surface with
the magnet 2 is bent to protrude downward. The positioning of the magnet 2 and the upper plate
3 was performed by the curved portion 12. However, since the tip of the bent portion 12 extends
downward, a magnetic short circuit occurs, and the Macnet 2 width effect is reduced by 12
minutes, and the magnetic utilization factor of the magnet 2 decreases. At the same time, an eddy
current is generated in the upper part (3), and the electric impedance in the high frequency
region of the voice coil 80-'3 increases as shown by the broken line in FIG. The reduction of the
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input power occurs in the high frequency band of H. As a result, the sound pressure-frequency
characteristic can not be extended as shown by the broken line in FIG. The present invention
eliminates the above-mentioned conventional drawbacks. Hereinafter, an embodiment of the
present invention will be described with reference to FIGS. An internal magnet type magnetic
circuit 13 has a laminated body of a magnet 15 and an upper grate 16 disposed at the center of
the inside of the yoke 14 having a U-shaped cross section. A cap 17 made of copper or the like
having a low electrical resistivity is formed on the laminated body so as to have the same outer
diameter, and the above-mentioned Macnet 16 and the upper plate 16 are positioned. A link may
be used instead of the gear 111. A frame 18 is coupled to the yoke 14 of such a magnetic circuit
13, and the peripheral edge of the diaphragm 200 is fixed to the peripheral edge of the frame 18
together with the gasket 19, and the central portion of the diaphragm 20 is fixed. The voice coil
21 is coupled, the middle portion of the voice coil 21 is held by the damper 22, the lower portion
of the voice coil 21 is fitted into the magnetic gap 23 of the magnetic circuit 13 without
eccentricity, The dust cap 24 is attached and is comprised.
With the above configuration, the effective height of the magnet 15 is utilized so that the
magnetic force of the magnet 16 acts without loss, so that the efficiency is improved and the cap
17 or ring with small electric resistivity is covered. Therefore, the eddy current generated in the
upper plate 16 can be reduced, and the increase in the electrical impedance in the high region of
the voice coil 21 is suppressed as shown by the solid line in FIG. The speaker according to the
present invention can be configured to be able to prevent the reduction of the input power at the
same time, and improve the sound pressure-frequency characteristics to those with high and one
extension as shown by the solid line in FIG. Therefore, the positioning of the magnet and the
upper plate can be measured with a simple configuration, and the eddy current generated in the
upper plate can be reduced to further extend the high region of the sound pressure-frequency
characteristic. It is intended that can be made dog practical value assumed wide reproduction
band Te.
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