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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b show the construction of a
conventional electroacoustic transducer, and FIGS. 2a and 2b show the construction of a
microphone using the electroacoustic transducer and FIG. Figs. A and b are block diagrams of an
electroacoustic transducer showing a first embodiment of the present invention, and Fig. 4 avb is
a bottom view showing a second embodiment of the present invention. DESCRIPTION OF
SYMBOLS 1 ... Metal plate, 2a, 2b ... Piezoelectric porcelain, 4 ... Support stand, 5 ... Case, 6e ,. 6b-·
· · terminals, 8a, 8b · · · lead wire, 10 · · · · · · · · · · · · · · · · · · · · protrusion, 13 · · · cut. Figure 1 Figure
2 (g) (b) (? l2 (7)-1.63-actual opening 5 · 1-154171 (2) Fig. 3 Fig. 4 ω 9 (A.) (1) (/ l)-164 =
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic
microphone comprising an electroacoustic transducer comprising a metal plate surrounded by
two Ith electromagnetic devices attached to a support and housed in a case. In the production
line, when the electroacoustic transducers are sequentially attached to the support base, it is
possible to always support the same position of the transducers and support the support base,
and to obtain a characteristically stable ceramic microphone. It exists in the point which it tries to
produce. In general, an ultrasonic provisional ceramic microphone (hereinafter referred to as a
microphone, referred to as a microphone) is not shown in FIG. An electro-acoustic transducer
(hereinafter abbreviated as a father) (3) having a single-piece piezoelectric ceramic (2aH2b) and
containing a piezoelectric base (2aH2b) is housed in the case (5) with the support base (4) closed.
When a sound wave with a frequency approximately equal to the resonant frequency of the
converter (3) comes from the outside, the converter (3) resonates and generates a voltage of the
frequency e at the terminals (6a) (6b) 145 By applying a voltage equal to the resonant frequency
of the transducer: 3) to the insulator (6a, 6b) to generate a sound wave of that frequency,
colliding with the transducer (3). . This is the principle to be used for microphone (7) all
reception and transmission. (8a) and (8b) in the% 1 figure are lead wires and (9) company
protection nets. By the way, the transducer (3) vibrates in a bending mode, and the abdomen and
the nodes of the imaging motion are distributed concentrically. Therefore, depending on the
support position of the converter (3), the characteristics of the transmission and reception
change greatly regardless of the center frequency or the sensitivity. In the past, it was applied
horizontally to the elastic adhesive aQt-crest (4) and the number ta (3) was attached to the
support-41, or according to this method, the variation of the support position was obvious and
stable All production went away. (2) A 些)-; The present invention is intended to eliminate such
inconveniences, and an embodiment of the first application of the present invention will be
described below with reference to Figs. Description will be made based on FIG. In the
configuration of the embodiment of FIG. 1 and FIG. 4, the same components as those in the
conventional example of FIG. 1 and FIG. As is apparent from the constructions of FIGS. 8 and 4,
the present invention is a metal plate which constitutes the transducer 011. A metal plate (1) is
formed by cutting a K-shaped cut (13 and bending one end of the metal plate (1), and in the
embodiment of FIG. The method of forming the spout is not limited to the above two examples,
and a separately produced product may be attached to the metal plate t1) by welding or the like
As described above, if the converter 112) formed with the projections 112t on the metal plate (1)
is attached to a support (4) such as that shown in FIG. Because it will be held at the same position
in which f-conversion 1titul16K, therefore it will be 'fffi' to the characteristic tongue of any
microphone obtained (ゐ '), 鴨' ~ 緊-, and so only production It becomes easy. As described above,
according to the present invention, the projection is provided on the metal plate, and the electroacoustic transducer is attached to the support base by means of the protrusion, so that a
microphone with stable characteristics can be easily produced.
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