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Description 1, title of the invention
Composite oscillator
3. Detailed Description of the Invention The present invention relates to a composite vibrator
which enables provision of an acoustic wave generator having a thin and simple structure. First,
the basic structure of the composite vibrator and the operation principle thereof are shown in
FIGS. 1 (a), (b) and FIG. In FIG. 1, 1 is a piezoelectric ceramic plate subjected to polarization
treatment, and electrodes 2.2 'are attached to both sides. An adhesive 3 is used to bond the
piezoelectric ceramic plate 1 and the metal diaphragm 4. When an alternating electric field V is
applied to this composite vibrator as shown in FIG. 2, the piezoelectric ceramic plate 1 expands
and contracts in the radial direction in accordance with the polarity of the electric field, resulting
in bending vibration as shown by a broken line. FIG. 3 shows an example of a circuit of an
acoustic wave generator using a composite vibrator. In this example, since the composite vibrator
is also used as a part of the oscillation circuit, the electrode 2 of FIG. 1 is divided. In FIG. 3, E is a
DC power supply, P is a composite vibrator, Tr is a transistor, and R1 and R2 are resistance
elements. FIG. 4 shows a cross-sectional view of a configuration example of the circuit of FIG.
EndPage: The composite vibrator P is fixed to the case 6, and the passive circuit element and the
active circuit element 7 (specifically, the transistor Tr and the resistors K1 and R2 in FIG. 3) are
connected by the lead wires 8, 8 'and 8 ". It is connected to the. The case 5 is provided with an
opening 6 on the front surface so that acoustic waves can be efficiently output to the outside.
Still, lead wires 9, 9 'are led from the circuit element 7 to the outside of the case 6 for input from
the power supply outside the case 5. Now, the complex vibrator and the acoustic wave generator
of the above-described conventional configuration have the following drawbacks. That is, lead
wires 8, 8 ', 8' are necessary to connect .tau. With the composite vibrator P and the circuit
element 7, and the length thereof is the composite vibrator P with the circuit element to be
incorporated into the case 5. It is a shame that it is necessary to be longer than the distance
between 7 and 7. This is quite disadvantageous for obtaining a thin and simple structure acoustic
wave generator. In addition, the fact that the circuit element 7 and the composite oscillator P are
not integrated is intended to be inconvenient in terms of incorporation, and an example of the
composite oscillator according to the present invention is first shown in FIG. Shown in (b). Here,
the basic circuit configuration is the same as that of the prior art shown in FIG. 3 for comparison,
and the reference numerals and symbols used in the explanation are the same as those in FIGS. 1
to 3. In FIG. 6, electrodes 2 ?, 2 ? ? on the pressed porcelain plate 1. 2 /// is divided and the
transistor Tr has an electrode 2 '. It is electrically connected to 2 ? ? and the metal diaphragm
4 respectively.
Still, the resistance element R1 is connected to the electrode 2 ', 2'i / (similarly, the resistance
element tt2 is connected to the electrode 2' 'and the metal diaphragm 4. Further, leads-9, 9 'for
input are taken out of the electrodes 2 /, 2 ///. Although the lead wires 9 and 9 'are used here, a
terminal bin may be used or a contact type input electrode such as a spring may be used. In FIG.
5, the circuit elements (transistor Tr and resistance elements R1 and R2) are arranged in the
vicinity of the node of vibration indicated by a broken line. Further, the electrode 2 ? ? is not
an electrode of the input / output of the piezoelectric ceramic plate 10 but an electrode used for
relaying. Further, in the example of FIG. 5, the oscillation circuit is configured as the abovedescribed one = 1. 6A and 6B (@ indicates another embodiment of the present invention in which
the circuit element is assembled through the printed wiring board, the circuit element 7 is put
together on the printed wiring board 10, and the metal diaphragm 4 is shown. It is fixed on top.
FIG. 7 shows an example of an acoustic wave generator using the composite vibrator of FIG. 5,
which in this example is a lead wire 8.8 '. 8 ? ? is no longer needed. As described above, in the
composite vibrator according to the present invention, the lead wire connected to the circuit
element is not necessary, or it is very short even if used, and the lead wire does not need to be
easily housed. However, the construction of a much thinner acoustic wave generator than before
is possible. Moreover, since it is integrated with the circuit element, the handling is very easy,
and the process such as incorporation becomes extremely simple.
4. Brief description of the drawings Fig. 1 (a), (b) is an electrical circuit diagram of the sound
transfer generator showing the basic structure of the composite vibrator, and Fig. 4 is a cross
sectional view showing a configuration example of the same device 5 (a) and 5 (b) are a top view
and a cross-sectional view showing one working row of the composite vibrator according to the
present invention, and FIGS. 6 (a) and 6 (b) are composite vibrators according to the present
invention. FIG. 7 is a cross-sectional view of an acoustic wave generator using the composite
vibrator of FIG. 6, showing a top view and a cross-sectional view showing another embodiment. 1
ииииии Piezoelectric porcelain plate, 2, 2/2 ? ? 2 ? ? (ииии Electrode, 4 ииииии Metal diaphragm, 7 (Tr,
Ml, R2) иии .... Circuit elements (transistors, resistance elements), 1 o... 1 (embedded name patent
attorney Toshio Nakao et al. 1 person EndPage: 2 Fig. 1 Fig. 2 Fig. 3 Fig. 4 ? 6 Fig. 8 'EndPage:
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