Metal working – Piezoelectric device making
Patent
1982-09-29
1983-10-18
Hall, Carl E.
Metal working
Piezoelectric device making
H04R 1700
Patent
active
044097115
ABSTRACT:
An acceleration resistant crystal resonator is made from a single quartz te that is optically twinned into a left-handed (LH) quartz portion and a right-handed (RH) quartz portion. According to the method, the optically twinned single quartz plate is formed into a resonator plate wherein the effective thickness of the (LH) portion is substantially the same as the effective thickness of the (RH) portion. The resonator plate is then mounted and bonded to the support structure of a crystal resonator enclosure. A pair of electrodes is then deposited onto the (LH) portion and a pair of electrodes deposited onto the (RH) portion. The thickness of the two pairs of electrodes is then adjusted so that the resonant frequency of the resonator on the (LH) portion is substantially the same as the resonant frequency of the resonator on the (RH) portion. The pairs of electrodes are then interconnected to each other and to an oscillator circuit so that in-phase vibration of the two portions is assured. The enclosure is then hermetically sealed.
REFERENCES:
patent: 1782117 (1930-11-01), Cady
patent: 2472179 (1949-06-01), Tibbetts
patent: 3129346 (1964-04-01), White
patent: 3968462 (1976-07-01), Coussot
patent: 4112147 (1978-09-01), Thompson
patent: 4163959 (1979-08-01), Dailing
patent: 4344010 (1982-08-01), Vig et al.
Ballato Arthur
Vig John R.
Echols P. W.
Gibson Robert P.
Gordon Roy E.
Hall Carl E.
Murray Jeremiah G.
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