Ultrasonic transducer
AssigneeSuncall Corporation
InventorSatoru TAKASUGI
Life of this patent
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Abstract
An ultrasonic transducer of this invention includes a supporting plate having plural cavity portions and waveguides opened to first and second surfaces, respectively, a flexible resin film fixed to the supporting plate, and plural piezoelectric elements fixed to the flexible resin film so that, in a plan view, their center regions overlap with the corresponding cavity portions and their peripheral regions overlap with the supporting plate, the cavity portion and the waveguide portion being set to have a shape and size set so as to suppress transmittance of the sonic wave, which has the frequency within ±1.5% of the resonance frequency of the piezoelectric element.
Claims10
An ultrasonic transducer comprising:
- a rigid supporting plate having first and second surfaces on one side and the other side in a thickness direction, respectively, the supporting plate being provided with a plurality of cavity portions opened to the first surface, and a plurality of waveguides having first end portions on one side that are opened to bottom surfaces of the corresponding cavity portions and that have opening widths smaller than those of the corresponding cavity portions and second end portions on the other side that are opened to the second surface;
- a flexible resin film that is fixed to the first surface of the supporting plate so as to cover the plurality of cavity portions;
- and
- the same number of piezoelectric elements as the cavity portions that are fixed to a first surface of the flexible resin film so that their center regions overlap with the corresponding cavity portions and their peripheral regions overlap with the first surface of the supporting plate in a plan view,
- wherein the cavity portion and the waveguide portion have a shape and size set so as to suppress transmittance of the sonic wave, which has the frequency within ±1.5% of the resonance frequency of the piezoelectric element.
Dependencies are inferred from the claim text.