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JPS60106298

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DESCRIPTION JPS60106298
[0001]
FIELD OF THE INVENTION The present invention is mainly applied to detection systems such as
parking meters and automobile rear detection devices, and relates to an ultrasonic ceramic
microphone for transmitting and receiving ultrasonic waves. Prior Art Configuration and
Problems Thereof A conventional ultrasonic ceramic microphone of this type will be described
with reference to FIG. First, 1 is a piezoelectric ceramic vibrator, and this is bonded to the inside
of the bottom 2a of a cylindrical case 2 having a bottom 2ai with a truncated cone in cross
section, and the bottom 2a is configured as a bimorph vibrator It is fixed to the inside of the case
2 by a 03Fi resonance ring. A terminal plate 4 is fixed to the open end of the case 2 via an elastic
member 5 and an elastic adhesive, and is formed by sealing the open end of the case 2. 7a and
7b are lead wires, and 8a and 5b (terminals embedded in the d terminal plate 4; the lead wire 7a
soldered to the electrode surface of the piezoelectric ceramic vibrator 1 is used as the terminal
8a and at the same potential as other electrodes According to the conventional structure such as
O or more which is configured to be connected to the lead wire 7b2 terminal 8b connected to a
certain case 2 with an elastic adhesive 9 respectively, reverberation is generated by the
interference of ultrasonic waves generated in the case When the pulse signal is generated and
transmitted, there is a problem that the pulse fall time becomes long. Here, as a method of
improving the pulse response, resonance of the vibrating portion. There is a way to lower the
That is, resonance. Is indicated by the following equation. fO: resonant frequency 2 m: mass. Rm:
mechanical resistance, Cm: mechanical reactance. Therefore, although the mechanical resistance
Rm is increased, Q can be lowered by changing the material in the vibrating part or reducing the
mass to reduce the mass, but conversely, the reaching distance of the ultrasonic waves is reduced
and it is not suitable for practical use. Therefore, measures can be taken by changing the shape
of the component without changing the basic structure of the conventional configuration. ??
Further, in the slave configuration, there is a problem that reverberation occurs due to the wiring
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state of the lead wire and the shape of the resonance ring. SUMMARY OF THE INVENTION The
present invention solves the above-mentioned conventional drawbacks, and elastically absorbs
lead vibration, separates the phases of ultrasonic waves generated in the case, and reduces
acoustic interference. It is an object of the present invention to provide an ultrasonic ceramic
microphone excellent in pulse response. In order to achieve this object, in the ultrasonic ceramic
microphone of the present invention, a piezoelectric ceramic vibrator is attached to the inside of
the bottom of a cylindrical case having a bottom having a truncated cone shape in cross section,
and the bottom is subjected to bimorph vibration. A resonance ring is provided inside the
cylindrical case configured as a child, and a resonance cylinder is provided in the inner circle of
this resonance ring to separate the phases of ultrasonic waves different inside and outside the
vibration node circle of the bimorph oscillator. Thus, the configuration is configured to reduce
the interference of ultrasonic waves generated in the case.
A lead wire connected by soldering to the electrode surface of the piezoelectric ceramic vibrator
is wired via an elastic adhesive along the inner side of the cylindrical case, and the lead wire is
formed from a recess provided on the outer periphery of the resonance ring. The terminal plate
is resiliently fixed to the open end of the cylindrical case via an elastic member, and the other
lead wire is taken out from the terminal plate, and the lead wire and the cylindrical case are
taken out as electrodes. It will be The ultrasonic ceramic microphone according to an
embodiment of the present invention will be described below with reference to FIG. The same
members as in the prior art are given the same reference numerals. Reference numeral 1 denotes
a piezoelectric ceramic vibrator, which is bonded to the inside of the bottom 2a of a cylindrical
case 2 having a bottom 2af having a truncated conical cross section, and is configured as the
bottom 2ai bimorph vibrator. Reference numeral 10 denotes a resonance ring, which is fixed to
the inside of the case 2 by adhesion. The resonant cylinder 11 is adhesively fixed to the inner
circle of the resonant ring 10. The lead wire 7 a is soldered to the electrode surface of the
piezoelectric ceramic vibrator 1, and the other end is sealed and fixed to the open end of the case
2 via the elastic member 12 and the elastic adhesive 9. It is connected. The lead wire 7 a is wired
along the inside of the case 2 through the recess 10 a of the resonance ring 1 o via the elastic
adhesive 13. Reference numeral 7b denotes a lead wire, which is connected to the case 2 which
is at the same potential as the other electrode surface of the piezoelectric ceramic vibrator 1 and
whose other end is a terminal 7b [connected n. And although the said resonance cylinder 111d
resin member is used, when integrating with the resonance ring 1o, it is good also as metal. In
addition, by setting the length close to resonance (?-wavelength), the effect of preventing
ultrasonic waves having different phase differences from interfering with each other is enhanced.
According to the present invention, the resonance cylinder arranged in the case separates
ultrasonic waves of different phases which interfere intricately in the case, and increases the
acoustic resistance (corresponding to Rm) in the case by the resonance cylinder. By this, the
resonance Q can be lowered. Figures 3 and 4 compare the sensitivity-frequency characteristics
and pulse response of the microphones of the present invention and the prior art. The
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characteristics of the conventional product are shown by the characteristics iB of the invention of
the present invention and the products of the present invention are shown. The pulse response is
improved without lowering ol. At the same time, the configuration does not suppress the
vibration of the bimorph vibration surface of the case, so that it is possible to provide a pulseresponsive sharp falling ultrasonic ceramic microphone without lowering the sensitivity. Further,
since the lead wire is wired through the elastic adhesive, the vibration proof effect of the lead
wire can be enhanced, and the interference due to the vibration of the lead wire can be reduced
at the time of resonance.
By realizing the configuration of the present invention as described above, the microphone can
be used for both transmission and reception of ultrasonic waves, and from now on, new
applications can be expected to be developed including the obstacle detection device.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a conventional ultrasonic ceramic microphone, FIG. 2 is a crosssectional view of an ultrasonic ceramic microphone according to an embodiment of the present
invention, and FIG. 3 shows sensitivity-frequency characteristics of the product of the present
invention and the conventional product. FIG. 4 is a diagram showing comparison and FIG. 4 is a
diagram showing pulse response in comparison.
DESCRIPTION OF SYMBOLS 1 иииии Piezoelectric ceramic vibrator, 2 ииииииииииииииииииииииииииииииииииии Terminal
plate, 6 ииииии Elastic member, 7a, 7b иииииииииииииииииии line, 10 ..... resonant ring, 10a и middle recess 11 .....
resonance tube, 12 ..... elastic member, 13 ... elastic adhesive. Name of agent Attorney Nakao
Toshio has 1 person Figure 1 Figure 3 Figure 4
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