Piezoelectric resonator apparatus with acoustic reflector

Details Piezoelectric resonator apparatus with acoustic reflector Piezoelectric resonator apparatus with acoustic reflector

2005-01-11

2005-01-11

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06841922

ABSTRACT:
A resonator apparatus has a piezoelectric resonator as well as an acoustic reflector which has a layer having a high acoustic impedance and a layer having a low acoustic impedance. The thickness of one layer is set different from a quarter of the wavelength in this layer at the operating frequency due to technological limitations in the manufacturing of this layer, and the thickness of the other layer is set dependent from the one layer, such that a predetermined minimum quality of the acoustic reflector is attained.

REFERENCES:
patent: 5629906 (1997-05-01), Sudol et al.
patent: 5646583 (1997-07-01), Seabury et al.
patent: 6603241 (2003-08-01), Wong et al.
patent: 6747529 (2004-06-01), Abe et al.

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