Frequency adjusting a piezoelectric device by lasering
Patent 4131484 Issued on December 26, 1978. Estimated Expiration Date: 
February 13, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 13, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3653253 3928063 InventorsAssigneeApplicationNo. 05/877541 filed on 02/13/1978US Classes:134/1, Including application of electrical radiant or wave energy to work219/121.85, Method29/25.35, PIEZOELECTRIC DEVICE MAKING29/593, Including measuring or testing of device or component part310/312Adding or subtracting massExaminersPrimary: Fisher, Richard V.Attorney, Agent or FirmInternational ClassesB08B 17/00 (20060101)B23K 26/08 (20060101) B08B 7/00 (20060101) H03H 3/00 (20060101) H03H 3/04 (20060101) B08B 17/02 (20060101) AbstractElectrode 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.Other References
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