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JPS56137796

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DESCRIPTION JPS56137796
Description 1, title of the invention
Electro-acoustic transducer
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a full drive
electro-acoustic transducer having a diaphragm in which a conductor is printed on a polymer
film. FIG. 1 is a cross-sectional view showing an example of a conventional electroacoustic
transducer. f +) is a diaphragm, (2) is a fixed part of the diaphragm, (3) is a fixed body for fixing
the fixed part (2), (4) is a play), +51 is a magnet. (6) is a yoke, and the plate (4), the magnet (5)
and the yoke (6) constitute a magnetic circuit. The conductor printed on the diaphragm (1) is
disposed in the air gap of the magnetic circuit, and when an alternating current signal is applied
to the conductor, the diaphragm (1) vibrates in the vertical direction of the drawing sheet and
sounds upward. Radiate to The fixed part (2) of the diaphragm (1) is fixed by being sandwiched
between the fixed body (3) and the plate (4), and the fixed part (2) is less of the fixed body (3) or
play) + 4i Either is adhered to one side or crimped and fixed by both of them. The fixed portion
(2) of the diaphragm (1) facing the fixed body (3) or the plate (4) is flat. In the conventional
electroacoustic transducer, the fixed portion (2) of the diaphragm (1) is fixed as described above.
EndPage: In the case of adhesion or pressure bonding, the diaphragm (1) has a drawback that an
uneven force is easily applied and partial distortion occurs. If sound pressure is generated in
such a state, it causes distortion, which is not a preferable state in terms of characteristics. The
present invention has been made to eliminate the disadvantages of the prior art as described
above, and applies a uniform force (tension) to the diaphragm (+1) even when the diaphragm (1)
is fixed or fixed. Therefore, it is an object of the present invention to provide an electroacoustic
transducer with less occurrence of distortion. Hereinafter, an embodiment of the present
invention will be described with reference to FIGS. 2 and 3. FIG. 2 and 3 are enlarged views of the
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main parts of the fixed portion of the diaphragm, and FIG. 2 shows the state before the fixed
body (3) is attached, and the fixed portion (2) of the diaphragm (1) It is bonded to the plate (4)
and the auxiliary fixed body (7). FIG. 3 shows the fixed body (3) mounted. As described above,
the diaphragm (1) is bent by the fixed body (3) and the auxiliary fixed body (7) by mounting the
fixed body (3). Therefore, the perturbation plate (1) is uniformly tensioned, and a flat diaphragm
without distortion is obtained. The sound pressure distortion characteristics when the present
invention is carried out are shown in FIG. 4 in comparison with the conventional example. In the
figure, the characteristic (a) is the frequency characteristic of the fundamental wave, the
characteristic (b) is the frequency characteristic 2% of the second harmonic when the
conventional one is implemented (c). It is a frequency characteristic of the 2nd harmonic of the
case.
As shown in FIG. 4, when comparing 1% (b) and (c), 9 characteristics according to the present
invention (c) are closer to 10 dB in the lower range than the characteristics (b) of the
conventional one Improvement has been made and the effect is great. 5 and 6 show another
embodiment of the present invention, and FIG. 5 shows a state before mounting the fixed body
(3), and FIG. 6 mounts the fixed body (3). Indicate the state of completion. In the case of FIG. 5
and FIG. 6, the diaphragm (1) is adhered to the auxiliary fixed body (7), and the fixed body (3)
having a projecting portion at the part facing the magnetic gap is attached. By doing this, as
shown in FIG. 6, the diaphragm fI) Fi, as shown in FIG. 6, provides a bending tension by the
projecting portion of the fixed body (3). Therefore. The same effect as that of the embodiment
shown in FIGS. 2 and 3 can be obtained, and the sound pressure type can be reduced. In Figures
2.3 and 5.6 showing an embodiment of the present invention, the auxiliary fixing member (7) is
separated from the plate (4), but may be part of the plate (4). It is not limited to the shape.
Furthermore, at least one of the fixed body (3) or the auxiliary fixed body (7) may be an elastic
body capable of providing a tension to the diaphragm (1) and capable of absorbing vibration. G.
Can be used to suppress variations when fixing the diaphragm +11, and it is possible to provide a
stable electroacoustic transducer. As described above, according to the present invention, the
diaphragm can be tensioned and fixed, and by realizing a flat diaphragm without distortion, an
effect that an electroacoustic transducer with less generation of strain can be obtained is
obtained. is there.
4. Brief description of the drawings Fig. 1 is a cross-sectional view of a conventional
electroacoustic transducer. FIG. 2 shows an enlarged sectional view of the main part according to
one embodiment of the present invention, showing a state before mounting a fixed body for
fixing a diaphragm, and FIG. The principal part expanded sectional view which shows. FIG. 4 is a
diagram showing a comparison of second harmonic frequency characteristics of the prior art and
the present invention, and FIG. 5 is an enlarged cross sectional view of an essential part
according to another embodiment of the present invention before mounting a fixed body for
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fixing a diaphragm. FIG. 6 is an enlarged cross-sectional view of an essential part showing a
completed state in which the fixed body is mounted. (1) ... diaphragm, (2) ... fixed part of
diaphragm, (3) ... fixed body, (4) ... plate, (5) ... magnet, (6) · · Yoke, (7) · · · · · · auxiliary fixed body
In Figure 9, the same reference numerals indicate the same or corresponding parts. Attorney
Attorney Attorneys-EndPage: 2 Fig. 1 M and several HzEndPage: 3
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