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JPH07203583

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DESCRIPTION JPH07203583
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art With recent miniaturization of audio equipment, the space for
mounting a speaker has become smaller, and therefore, downsizing and slimming of the speaker
are required. In addition, high sound quality, high efficiency speakers are needed.
[0003]
A conventional speaker of this type will be described with reference to FIG. A magnet 2 is
installed in the yoke 1, and a plate 3 is provided on the top of the magnet 2 to constitute a
magnetic circuit 4. The peripheral portion of the diaphragm 6 constituted by a single curved
surface is coupled to the peripheral portion of the frame 5 coupled to the upper portion of the
magnetic circuit 4, and the voice coil 7 is coupled to the central portion of the diaphragm 6 The
coil 7 is fitted into the magnetic gap 8 of the magnetic circuit 4 and the voice coil 7 is supported
only by the diaphragm 6.
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1
[0004]
However, with the diaphragm 6 having a single curved surface like the above-described
conventional speaker configuration, if the area of the diaphragm 6 is increased to improve the
efficiency, or if If the shape of the diaphragm 6 is made elliptical in order to achieve high
efficiency, the rigidity of the diaphragm 6 is insufficient, causing unnecessary resonance and
causing distortion. In particular, in the case of an elliptical diaphragm, generation of unnecessary
resonance due to insufficient rigidity in the major axis direction has been a problem.
[0005]
An object of the present invention is to solve the above-mentioned conventional problems, and to
provide a speaker with low distortion, high sound quality and high efficiency.
[0006]
SUMMARY OF THE INVENTION In order to achieve this object, the loudspeaker according to the
present invention couples a frame to a magnetic circuit having a magnetic gap, and a voice coil,
which fits into the magnetic gap, is fitted to the periphery of the frame. The outer peripheral
portion of the diaphragm coupled to the central portion is coupled, and depressions having a
diameter of 2 mm and a depth of 1 mm are formed at an interval of 1 mm on the entire surface
of the diaphragm.
[0007]
According to the above construction, rigidity of the diaphragm can be increased, unnecessary
resonance can be prevented, distortion can be reduced, and a speaker with high sound quality
and high efficiency can be provided.
[0008]
An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and
3. FIG.
[0009]
1 is a half sectional view of the speaker in the embodiment, FIG. 2 (a) is a plan view of a
diaphragm used for the same speaker, FIG. 2 (b) is a half sectional view of the same diaphragm,
and FIG. FIG. 3B shows the third distortion frequency characteristic.
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2
[0010]
In FIG. 1, reference numeral 12 denotes a magnetic circuit, and the magnetic circuit 12 is
provided with a magnet 10 in a yoke 9, a plate 11 is provided on the top of the magnet 10, and a
magnetic circuit 12 having a magnetic gap 16 is formed. ing.
The peripheral portion of the diaphragm 14 is coupled to the peripheral portion of the frame 13
coupled to the top of the magnetic circuit 12, the voice coil 15 is coupled to the central portion
of the diaphragm 14, and the voice coil 15 is coupled to the magnetic gap 16 of the magnetic
circuit 12. It is inset.
[0011]
Here, on the entire surface of the diaphragm 14 of the present embodiment, indentations having
a diameter of 2 mm and a depth of 1 mm are provided at intervals of 1 mm.
As a result, the rigidity of the diaphragm 14 can be increased, unnecessary resonance can be
prevented, and distortion can be reduced.
The distortion frequency characteristics are shown in FIG. 3. The dotted line is the conventional
speaker, and the solid line is the speaker of the present invention.
[0012]
As described above, according to the configuration of the speaker of the present invention, it is
possible to increase the diaphragm area to increase the efficiency, or to make the diaphragm
shape elliptical to achieve both slimming and high efficiency. The rigidity of the diaphragm can
be increased, unnecessary resonance can be prevented, distortion can be reduced, and a speaker
with high sound quality and high efficiency can be provided.
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