Transmitter-receiver of ultrasonic distance measuring device
First Claim
1. A transmitter-receiver of an ultrasonic distance measuring device comprisinga columnar supporter;
- an annular recess provided in the peripheral surface of said supporter with both end portions thereof remaining;
a cylindrical piezoelectric polymer film secured to said end portions of said peripheral surface of said supporter to cooperate with said recess to define a chamber;
electrodes provided on the outer and inner peripheral surfaces, respectively, of said piezoelectric polymer film;
a conical reflector connected at its top to one end of said supporter to impart directivity to ultrasonic waves transmitted and received so that the transmitted ultrasonic wave travels in the axial direction of said supporter; and
a pressure equalizing bore provided in said supporter to provide communication between said chamber and the outside.
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Accused Products
Abstract
A transmitter- receiver of an ultrasonic distance measuring device comprising a cylindrical piezoelectric element made of a polymer in place of a piezoelectric vibrator of a ceramic material or the like which has heretofore been used. The cylindrical piezoelectric element is secured to a columnar supporter in such a manner as to define a chamber in cooperation with a recess which is provided in the peripheral surface of the supporter. The supporter is provided with a pressure equalizing bore which provides communication between the chamber and the outside. In addition, a conical reflector is provided so as to impart directivity to the ultasonic wave transmitted from the piezoelectric element.
76 Citations
7 Claims
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1. A transmitter-receiver of an ultrasonic distance measuring device comprising
a columnar supporter; -
an annular recess provided in the peripheral surface of said supporter with both end portions thereof remaining; a cylindrical piezoelectric polymer film secured to said end portions of said peripheral surface of said supporter to cooperate with said recess to define a chamber; electrodes provided on the outer and inner peripheral surfaces, respectively, of said piezoelectric polymer film; a conical reflector connected at its top to one end of said supporter to impart directivity to ultrasonic waves transmitted and received so that the transmitted ultrasonic wave travels in the axial direction of said supporter; and a pressure equalizing bore provided in said supporter to provide communication between said chamber and the outside. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification