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JPS549918

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DESCRIPTION JPS549918
Description 1, title of the invention
Acoustic transducer using thick diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the arc length of
an acoustic transducer using a thick diaphragm. Since the diaphragm of the conventional
acoustic transducer is mostly thin, attachment of the coil bobbin to the diaphragm is performed
by dampering the coil bobbin 2 at the inner peripheral end of the diaphragm 1 as shown in FIG.
Attached with adhesive 4 with adhesive 4. By the way, in recent years, in order to utilize the good
characteristics of the one-sided vibration, for example, a flat diaphragm has been proposed in
which a front surface is formed into a plane by modifying, for example, a cone-shaped
diaphragm. This uses @fk foam as the material of the diaphragm, and the shape is approximately
frusto-conical, with the bottom of the frustum as the front. The top is a back, and there is a coil
bobbin ヲ Rff. However, since this diaphragm is thick, attachment of the coil bobbin can not use
the conventional method as it is, causing some difficulty, and even when attached, the input
signal can not be used for the input signal. As a result, deflection occurs in the coil bobbin, which
adversely affects EndPage: 1 acoustic characteristics. Therefore, in the present invention, the
planar diaphragm is divided into the peripheral vibration portion and the center cap portion, and
the coil bobbin is drawn into the gap in the back portion formed between the two, thereby
causing the problems as described above. It is an object of the present invention to provide an
acoustic transducer using a thick diaphragm, which has been solved. An embodiment will be
described with reference to FIG. 1 below. In FIG. 2, 5 is a thick flat diaphragm made of a
lightweight foam such as expanded polystyrene, and its entire shape is a truncated cone, and the
top Is configured as the back. In this diaphragm 5, the back portion of the divided peripheral
vibration portion 5b and the center cap portion 5 becomes an empty portion 5a, and in a state in
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which both are adhesively bonded, the circumferential groove 6 is formed on the back. Then, the
coil bobbin 2 is fitted into the circumferential groove 6 and fixed thereto by the adhesive 4. In
the figure, 7 is a phosphorus 2-like magnet% 8 is a plate, 9 is a yoke, and the other parts not
shown are the same as general speakers. As described above, according to the present invention,
the coil bobbin is fitted in the circumferential groove formed by the connection between the
peripheral vibration portion and the center cap portion. As a result, it becomes possible to make
the installation of 0 ilbobi very easy and to obtain sufficient strength of the mounting part and to
reduce the eccentricity, so the deflection phenomenon of the coil bobbin is extremely reduced. As
a result, distortion to the input signal is reduced, and the acoustic characteristics can be
improved.
4. Brief Description of the Drawings FIG. 1 is a partial sectional view of a conventional acoustic
transducer, and FIG. 2 is a partial sectional view of the acoustic transducer according to the
present invention. 5 ......... plane Shisadoban 2 ......... coil bobbin patent applicant pie Fang Ena Ltd.
EndPage: 2
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