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JPH081045

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DESCRIPTION JPH081045
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer having high reliability and stable temperature characteristics.
[0002]
2. Description of the Related Art Since mechanical impedance of air is significantly smaller than
that of piezoelectric elements and metal diaphragms, mechanical impedance as a material of a
conical resonator is conventionally made to improve the efficiency of acoustic impedance with
air. Aluminum and plastics are used. These materials are difficult to weld, and usually, the
diaphragm and the resonator are fixed by an epoxy adhesive.
[0003]
In the conventional ultrasonic transducer, the bonding surface of the diaphragm and the
resonator is deteriorated due to the temperature change of the external environment, and the
resonance frequency of the vibrator and the transmission / reception sensitivity are There was a
problem that fluctuated greatly.
[0004]
SUMMARY OF THE INVENTION According to the present invention, in the ultrasonic transducer
on which a conical resonator is mounted, the center of the metal diaphragm is a convex
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projection structure, and the resonator is a convex projection. It is characterized in that it is fixed
to a part, and the resonator is sandwiched between materials identical or similar to the
diaphragm and welded and fixed as a sandwich structure.
[0005]
[Operation] The ultrasonic transducer manufactured by this method has the same thermal
expansion coefficient as that of the diaphragm at the interface of the resonator, so the electrical
characteristics against the environmental temperature change are the conventional epoxy. It is
extremely stable compared to the adhesive layer.
The coefficient of thermal expansion of the metal diaphragm in the conventional product is about
1.5 × 10 -6 / ° C, and the epoxy adhesive is very different at about 6 × 10 -5 / ° C. Although
the adhesive layer of the diaphragm and the resonator is different due to the thermal factor
causing mechanical stress, in the present invention, the thermal expansion coefficient in the
adhesive layer is equal to that of the diaphragm, so the temperature change is Stable
characteristics can be obtained.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment The present
invention will be described based on FIG.
As shown in FIG. 1, an aluminum resonator 2 is inserted into the central convex portion of a
metal diaphragm 3 provided with a convex portion in the central portion, and the resonator 2 is
sandwiched and welded with a material 1 which is the same as or similar to the diaphragm. It is a
fixed structure. [Embodiment 2] In FIG. 2, a concave is provided at the center of the diaphragm to
sandwich and fix the resonator with a projection plate for welding having a convex projection
shape, and welding fixing strength is stabilized, and further high reliability is achieved. Sound
transducers can be made. FIG. 3 shows another embodiment of the present invention, and the
same characteristics as those of the second embodiment can be obtained.
[0007]
Industrial Applicability As described above, the present invention is an ultrasonic transducer
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which has no deterioration of thermal factors in the fixed layer of the resonator as compared
with the conventional product and has a fixed strength because it is mechanically coupled.
Significantly improve the environmental resistance characteristics, and can provide reliable
ultrasonic transducers to the market inexpensively.
[0008]
【0008】
[0009]
Brief description of the drawings
[0010]
1 is a structural cross-sectional view of the main part of the ultrasonic transducer of the first
embodiment of the present invention.
[0011]
2 is a structural cross-sectional view of the main part of the ultrasonic transducer of the second
embodiment of the present invention.
[0012]
3 is a cross-sectional view of the basic structure of the main part of an ultrasonic transducer
according to another embodiment of the present invention.
[0013]
4 is a cross-sectional view of the basic structure of the main part of a conventional ultrasonic
transducer.
[0014]
0009
[0015]
Explanation of symbols in drawings
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[0016]
1.
Welding projection plate of embodiment 1 of the present invention
Resonator of the Invention
Metal diaphragm of embodiment 1 of the present invention
Piezoelectric element 5.
Welding projection plate of embodiment 2 of the present invention
7. Metal diaphragm of embodiment 2 of the present invention
Conventional resonator 8.
Epoxy adhesive 9.
Conventional metal diaphragm 10. Resonator according to another embodiment of the present
invention 12. Welding projection plate according to another embodiment of the present
invention 12. Metal diaphragm according to another embodiment of the present invention
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