Method for adjusting an electrical device by electrode trimming

Details Method for adjusting an electrical device by electrode trimming Method for adjusting an electrical device by electrode trimming

1984-10-18

1987-07-07

Paschall, M. H.

Electric heating

Metal heating

By arc

219121LS, 219121LH, 219121LY, 219121EX, 356152, 364468, 29 2535, B23K 2600

Patent

active

046788913

ABSTRACT:
The frequency of a quartz crystal resonator (10) having a known radius (R) initially is adjusted upward toward a nominal resonant frequency in a "rough adjust" phase in which one or more lasered holes (24) are formed in a central portion of an outer electrode (12). The resonator ( 10) then is adjusted to the nominal resonant frequency in a "fine adjust" phase which initially involves utilizing a known coordinate position (70) and a laser (40) to determine coordinates (74 and 78) of two edge portions of the outer electrode (12). The edge portion coordinates (74 and 78) and the known electrode radius (R) then are used to determine coordinates (84) along an arc defined by a peripheral edge (28) of the outer electrode (12) in 5.degree. increments (85). Lasered holes (26) then are formed in the electrode edge (28) to adjust the resonator (10) to the nominal resonant frequency. Additional lasered holes (30) also may be formed in the electrode (12) along an arc of reduced radius for this purpose, if necessary.

REFERENCES:
patent: 4050126 (1977-09-01), Ikeno et al.
patent: 4131484 (1978-12-01), Caruso et al.
patent: 4156156 (1979-05-01), Sweany et al.
patent: 4327275 (1982-04-01), Asaba et al.
patent: 4532401 (1983-07-01), Shiozaki et al.
patent: 4532402 (1985-07-01), Overbeck
patent: 4584455 (1986-04-01), Tomizawa
patent: 4587396 (1986-05-01), Rubin
"Laser Machining . . . Crystal Substrates," Journal of Applied Physics, vol. 40, No. 3, Jul. 1969, pp. 3157-3160.

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