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DESCRIPTION JPS60217797

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DESCRIPTION JPS60217797
[0001]
(Industrial field of application) The present invention relates to a speaker r-> toss, positive rTsq 1
used in various audio devices (structure of the prior art and its problems) FIG. 1 shows a
conventional double cone type speaker The disc coil 4 is disposed in the air gap of the magnetic
circuit formed by the plate 1 with the pole piece, the ring-shaped magnet 2 and the top plate 3 in
a half sectional view showing the configuration of the second embodiment. It is transmitted to
the subcone 6. In the figure, reference numeral 5 denotes a frame, and 9 denotes a gasket. As a
sound pressure frequency characteristic of this speaker, since the wavelength of the bass
frequency is sufficiently long with respect to the distance between the cone diaphragm 7 and the
sub cone 6 in the bass range, there is almost no interference of the sound pressure between the
cone sheets. However, at frequencies up to the middle to high range, the wavelength is short, and
the distance between the cone diaphragm 7 and the sub cone 6 becomes a problem. Assuming
that the distance between the cone diaphragm 7 and the sub cone 6 is t, the wavelength λ at a
certain frequency f in the high range is given by Here, when the wavelengths λ and t are equal
to each other, the sound pressure is mutually enhanced, and a peak occurs in the sound pressure
frequency characteristics. Further, when the wavelength λ becomes λ = 2t with respect to t,
they mutually cancel each other, and due to the sound pressure frequency characteristics, it is
difficult to obtain a flat characteristic ideal as a speaker and a speaker. (Object of the Invention)
The present invention is intended to solve the above-mentioned problems, and to prevent highpitched disturbance on the sound pressure frequency characteristic of a double cone type using a
sub cone and flatten it It is intended to provide a possible speaker. In the present invention, a
sub-cone is attached to the upper end of a voice coil, and a ring-shaped sound absorber is
coaxially mounted with the voice coil in the space between the cone diaphragm and the sub-cone.
The DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a half sectional view of an
embodiment showing the configuration of the present invention, and 1 to 9 are the same as those
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shown in FIG. The difference is that the ring-shaped sound absorbing body 10 is disposed
coaxially with the central axis of the voice coil 4 in the space formed between the cone
diaphragm 7 and the subcarriage 76. The sound absorbing body 10 is filled while being in
contact with both the cone diaphragm 7 and the sub cone 6. The material of the still ring-shaped
sound absorbing body 10 is made of glass wool, natural fiber or chemical fiber, which is
composed of very fine fibers, and is excellent in sound pressure absorption at high frequencies. It
is a thing.
Therefore, in the sound pressure generated from both the cone diaphragm 7 and the sub cone 6,
the mutual interference generated as described in the prior art due to the distance between them
is canceled by the sound absorber 10, and the sound pressure frequency characteristic is
disturbed. Have the effect of preventing FIG. 3 shows sound pressure and frequency
characteristics of the conventional example and the present invention, where A indicates the
characteristic according to the conventional example and B indicates an example of improvement
of the characteristic according to the present invention. (Effects of the Invention) As described
above, according to the present invention, the disturbance in the high frequency range can be
prevented by simply mounting the sound absorber coaxially with the discoil between the cone
diaphragm and the subcone, and the sound pressure can be reduced. There is an advantage that
the frequency characteristics can be flattened.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view showing the structure of a conventional double cone type speaker,
FIG. 2 is a half sectional view of one embodiment showing the structure of the present invention,
and FIG. It is a figure which shows a characteristic.
l ... pole piece with Funto, 2 ... ring-shaped magnet, 3 ... top plate, 4 ... disc coil, 5 ... damper, 6 ...
subcone, 7 ... cone diaphragm 8 Frames 9 gaskets 10 sound absorbers.
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