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DESCRIPTION JPS55141897

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DESCRIPTION JPS55141897
Description 1, title of the invention
Electric-to-sound converter and method of manufacturing the same
3. Detailed description of the invention · · · · "" "" "" "triar") + E '! 74 / L, "-" 61... An air acoustic
transducer and its manufacturing method. FIG. 1 shows a converter unit for use in a converter of
this type in the prior art. In FIG. 1, 1 is a curved frame, 2 is a vibrating membrane adhered to one
side of the frame 1, and this vibrating membrane 2 has electrodes formed on both sides of a
pseudomolecular piezoelectric film such as polyvinylidene fluoride film. is there. In FIG. 1, when
sound pressure is applied to the vibrating membrane 2, an electric signal is obtained between the
electrodes, and conversely, when an electric signal is applied between the electrodes, the
vibrating membrane 2 vibrates to generate a sound wave. As shown in Fig. 2 and Fig. 3, the
converter unit made by bonding the vibration 11m2 to the frame 1 curved as above is attached
in the case 4 where the hole 3 is formed, and the converter is configured. Be done. In FIG. 2,
reference numeral 6 is a curved back plate disposed at the back of the frame, and the back plate
6 has a hole 6 formed therein. Numeral 7 is a sound absorbing material housed in the back of the
back plate 5. By adding the back plate 6 and the sound absorbing material 7, the resonance of
the vibrating membrane 2 can be damped to obtain a flat frequency response. In another prior
art example shown in FIG. 3, reference numeral 8 denotes a curved plate disposed on the front
surface of the diaphragm 2 via a spacer 9. A hole 10 is formed in the curved plate 8. In the
conventional example shown in FIG. 3, the resonance of the vibrating membrane 2 is damped by
the acoustic resistance of the air gap between the curved plate 8 and the vibrating membrane 2.
Thus, in the conventional converter, in order to damp the resonance of the vibrating membrane
2, as shown in FIG. 2, the back plate 5 and the sound absorbing material 7 are added, or as
shown in FIG. However, the curved plate 8 must be added, and there is a drawback that the
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number of parts increases at seven if the structure becomes complicated. The present invention
eliminates the above-mentioned conventional drawbacks, and an embodiment of the
electroacoustic transducer of the present invention will be described below with reference to FIG.
In FIG. 4, reference numeral 11 denotes a curved thin plate, and a hole 12 is formed in the thin
plate 11. 13 is a vibrating membrane in which electrodes are formed on both sides of a
polymeric piezoelectric film such as polyvinylidene fluoride film, and only the peripheral portion
of the vibrating membrane 13 is a back surface of the thin plate 11 curved by the adhesive.
Glued to. The vibrating membrane 13 is also curved along the curvature of the thin plate 11 at
the back of the thin plate 11. The E 1 knob at the center of the thin plate 11 and the vibrating
membrane 13 is several tens of μ.
In the present embodiment, the resonance of the vibrating membrane 13 is damped by the
acoustic resistance of the air gap between the thin f 11 and the vibrating membrane 13. The
degree of damping is determined by the number, size and gap length of the holes 12 in the thin
plate 11. Next, FIGS. 61 and 6 show the manufacturing method of the present invention. This will
be described with FIG. In FIG. 5, reference numeral 11 denotes a flat thin plate in which the holes
12 are formed, and only the peripheral portion of the vibrating membrane 13 tensioned in the
direction of the arrow is adhered to the back of the thin plate 11. The transducer unit is formed
by curving the thin plate 11 to which the vibrating membrane 13 is adhered only at its
peripheral portion as shown in FIG. FIG. 7 shows a cross section of FIG. 6, in which a minute gap
is formed between the curved thin plate 11 and the vibrating membrane 13. This minute gap can
be arbitrarily adjusted by the tension in the direction of the arrow in the bonding step shown in
FIG. 5 and the tension in the direction orthogonal to the direction of the arrow. As described
above, according to the electro-acoustic transducer of the present invention, the resonance of the
diaphragm can be damped by the thin plate and the diaphragm without using a back plate or the
like as in the conventional example. According to the manufacturing method of the present
invention, it is possible to form a fine gear tab simply by bonding a tensioned vibrating film to a
flat thin plate and curving the thin plate. Have the advantage of being able to
4. Brief description of the drawings. FIG. 1 is a perspective view of a transducer unit of a
conventional electroacoustic transducer, FIGS. 2 and 3 are sectional views of the conventional
electroacoustic transducer, and FIG. 4 is the present invention. FIG. 6 is a sectional view of an
electro-acoustic transducer in one embodiment of the present invention, FIG. 6 is a perspective
view in each step of the manufacturing method of the present invention, FIG. 7 is a sectional view
of the transducer unit of FIG. . 3 · · · Hole, 4 · · · · · · · · · · · · · · · · · · · · · · · · Figure 1? / Figure 2 \
Figure 3 7 EndPage: 2
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