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JPS55115197

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DESCRIPTION JPS55115197
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
piezoelectric acoustic transducer, FIG. 2 is a sound pressure frequency characteristic diagram of
the same transducer, and FIG. 3 is an embodiment of the piezoelectric acoustic transducer of the
present invention. 4 is a rear view of the main part of the embodiment, FIG. 5 is an admittance
frequency 6 of the embodiment, and FIG. 6 is a sound pressure frequency characteristic diagram
of the embodiment. FIG. 7 is a rear view of an essential part of another embodiment. 5 · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · elastic plate, 8 · · · cylindrical body, 9 · · · · · ·
terminal Board, 10 · · · · · · · · · · · · · · · · · · · · · lead wire.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
acoustic transducer used as a speaker or microphone of an audible layer 1 frequency range as a
king, and is a piezoelectric acoustic transducer having a simple configuration and better
sensitivity to sound pressure frequency characteristics. It is an object of the present invention to
provide a converter. go: Which piezoelectric acoustic transducer is commonly used? The
piezoelectric ceramic vibrator 1 is attached to the metal plate 2 as shown in FIG. 1, and the metal
plate 2 is configured to be supported by a support 3 provided at a node of the vibration as shown
in FIG. Therefore, in this type, the sound pressure frequency characteristic is extremely narrow as
shown in FIG. , 7 Yu. Work 8. ヮあウヤUイ1. = (。 Were almost impossible to use. Z--The
present invention is to eliminate the above-mentioned conventional drawbacks and to provide an
excellent piezoelectric acoustic transducer having a large sensitivity and a wide band sound
pressure frequency characteristic with a simple configuration. Hereinafter, the piezoelectric
acoustic transducer of the present invention will be described with reference to the drawings of
one embodiment. FIG. 3 is a cross-sectional view of an embodiment of the piezoelectric acoustic
transducer according to the present invention, in which 6 is a substrate made of a metal plate, an
insulating plate or an insulating plate (such as a printed wiring board) having metal foil or the
like. , 6 is a piezoelectric ceramic vibrator attached to the back surface of the substrate 6, 7 is an
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elastic body such as rubber bonded to the whole surface or a part of the substrate 6 including
the piezoelectric ceramic vibrator 6, 8 is a substrate 6: l, A cylindrical body for supporting the
outer peripheral portion, 9 is a terminal plate, 10 is a terminal attached to a 3-terminal plate 9,
and 11 is a lead for electrically connecting each electrode of the piezoelectric ceramic vibrator 6
to the terminal 10 It is a line. As is apparent from the above embodiment, the present invention
adheres the piezoelectric ceramic vibrator 6 to a substrate 6 such as a metal plate or an
insulating plate, and covers the opening in one opening of a cylindrical body 8 provided
separately. And the elastic body 7 such as rubber is attached to at least one surface of the
substrate 6, the substrate 6 is supported on the outer periphery thereof, and the elastic body 7
such as rubber is attached to the substrate 6 Because the frequency characteristics of the
admittance as a whole are shown in Fig. 6, the Q value at each resonance point is significantly
reduced compared to the characteristics before bonding or coating of the elastic body 7 (Fig. 6A).
Become a burden. Accordingly, as shown in FIG. 6, the sound pressure frequency characteristics
are remarkably flat as compared with the characteristics before bonding or coating of the elastic
body 7 (FIG. 6A), and are wide band. As described above, according to the present invention, the
sound pressure frequency characteristic is written. 誰 <・ r ・ 1− 1− 平 平 平 平 平 で き る i i i
iiiiiiiiiiiできるできるできるできるできるできるできるできるできるでき
るできるできるできるできるできるできるできるできるできるできるできる
で き る で き る で き る で き る で き る で き る で き る で き る で き る.
In the embodiment, as shown in FIG. 4, a rubber plate 7a formed in a seven-character shape is
used as the elastic body 7 and this is adhered to the substrate 6 as shown in FIG. In order to use
the elastic body 7, silicon rubber 7b or the like is used, and this is directly applied to the entire
surface including the piezoelectric ceramic vibrator 6, preferably-, □, y, i @ B. . Oh, Ih 11.1.
Alternatively, both of the silicone rubber 7 b and the rubber plates 7 a and 1 ′ may be used as
the elastic body 7.
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