Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-03-05
1987-02-10
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310320, 310365, 310366, 29 2535, H01L 4108
Patent
active
046425055
ABSTRACT:
An improved method of adjusting piezoelectric devices to frequency by particularized laser trimming is disclosed. The laser removes a single contiguous area in the center of the electrodes to appropriately increase the individual resonator frequency without significantly degrading the filter "Q". In an AT-cut monolithic crystal filter, the particularized laser trimmed area can be positioned such on the face of the electrodes to simultaneously control frequency and bandwidth. This method can be substituted for the more cumbersome process of frequency adjustment by vapor deposition to provide a rapid inexpensive technique for monolithic crystal filter manufacture.
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Boehm Douglas A.
Budd Mark O.
Motorola Inc.
Southard Donald B.
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