Ultrasonic receiver transmitter
A technology for receiving transmitters and ultrasonic waves, which is applied in the directions of sound wave re-radiation, instruments, sensors, etc., can solve the problems such as the decrease of reflection sensitivity, and achieve the effect of small change in electrostatic capacity and high reflection sensitivity
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[0030] figure 1 A schematic longitudinal cross-sectional view showing an ultrasonic receiver / transmitter according to an embodiment of the present invention. Figure 2 (a) is a schematic plan view and a longitudinal cross-sectional view of the bottomed cylindrical housing of the ultrasonic receiver and transmitter according to the embodiment of the present invention, and Figure 2 (b) and Figure 2 (c) show another embodiment of the present invention A schematic plan view and a longitudinal cross-sectional view of the bottomed cylindrical housing of the ultrasonic receiver / transmitter of. figure 1 In this, an annular groove 7 is provided inside the bottom surface of a bottomed cylindrical housing 2 made of aluminum material, etc., and a plate 3 made of a low thermal expansion alloy processed into the same ring shape is inserted into the device by bonding or press-fitting. In the groove 7 of the bottomed cylindrical shell, the piezoelectric element 1 is attached to...
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