Ultrasonic transmitter-receiver
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakeshi Yamaguchi, Masahiro Takada, Noboru Nomura, Osamu Kawasaki, Hirotaka Ishihara
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Abstract
In an ultrasonic transmitter-receiver for an apparatus for measuring the position or distance of an object, a composite vibrating unit is constructed with a piezoelectric vibrator and a cone, wherein a substantial conical vertex of the cone is connected to a center of vibration of the piezoelectric vibrator, and a node of vibration is generated on the cone at positions symmetrical about its center axis when the piezoelectric vibrator vibrates with deflection.
Claims3
A vibrating member for an ultrasonic transmitter-receiver, comprising:
- a piezoelectric element having electrodes to be supplied with or outputting therefrom a signal of an ultrasonic frequency;
- a vibrating cylinder which has a cylindrical structure closed with an upper base wall at one end and opened at the other end, wherein said piezoelectric element is fixedly attached to said upper base wall and a portion surrounding a portion where said piezoelectric element is fixedly attached is formed thinner than the portion where said piezoelectric element is fixedly attached;
- a base for closing said open end of said vibrating cylinder;
- and
- terminals provided passing through said base and electrically connected to said electrodes of said piezoelectric element.
An ultrasonic transmitter-receiver comprising:
- a piezoelectric vibrating member having electrodes to be supplied with or outputting therefrom a signal of an ultrasonic frequency;
- a diaphragm having a cone of a hollow conical structure, and connected to a center of vibration of said piezoelectric vibrating member at a substantial conical vertex of said cone, said piezoelectric vibrating member and said diaphragm together constituting a composite vibrating unit, and a periphery of said cone being free as a vibrator;
- a housing, forming an opening separated by a predetermined distance from an open end edge of a conical base of said cone, accommodating therein said composite vibrating unit, and elastically supporting said piezoelectric vibrating member thereon;
- and
- a horn connected to said housing, said horn forming a space gradually spreading from said opening toward a distal end.
Dependencies are inferred from the claim text.