Frequency adjusting a piezoelectric device by lasering

Details Frequency adjusting a piezoelectric device by lasering Frequency adjusting a piezoelectric device by lasering

1978-02-13

1978-12-26

Fisher, Richard V.

Cleaning and liquid contact with solids

Processes

Including application of electrical radiant or wave energy...

29 2535, 29593, 219121LM, B08B 702, B23K 3110, H04R 1710

Patent

active

041314840

ABSTRACT:
Electrode material is laser machined from a piezoelectric device (10) to adjust its resonant frequency to a nominal value. At the same time the device (10) is electronically cleaned by overdriving the device at a high current level to prevent loosely adhering lasered particles, which cause the device to be electrically unstable, from accumulating on the device. The simultaneous laser machining and electronic cleaning also eliminates erratic resonant frequency changes in the device (10) which occur if the electronic cleaning is performed after the laser machining. As the nominal resonant frequency value is approached, the device (10) is overdriven at successively lower current levels and the laser machining is carried out at respective successively lower rates.

REFERENCES:
patent: 3653253 (1972-04-01), Olin
patent: 3928063 (1975-12-01), King, Jr. et al.
Hokanson, et al., "Laser -Machining . . .," Journal of Applied Physics, vol. 40, No. 3, Jul. 1969, pp. 3157-3160.
Nonaka, et al., "The Current Dependency . . .," Proceedings of the 25th Annual Symposium on Frequency Control, Apr. 1971, pp. 139-147.

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