EP 0111483 A4 19851219 - TRIMMING OF PIEZOELECTRIC COMPONENTS.
Title (en)
TRIMMING OF PIEZOELECTRIC COMPONENTS.
Title (de)
TRIMMEN VON PIEZOELEKTRISCHEN KOMPONENTEN.
Title (fr)
AJUSTAGE DE COMPOSANTS PIEZOELECTRIQUES.
Publication
Application
Priority
US 8200823 W 19820614
Abstract (en)
[origin: WO8400082A1] A method of frequency trimming piezoelectric devices (1) such as quartz crystal resonators and surface acoustic wave filters. The device may be entirely enclosed in glass encapsulation (43) or be provided a housing (52) with a window (51) transparent to optical energy at a predetermined wavelength, for example, at 1.06 micrometer. A Q-switched, Nd-YAG laser (4) is directed by an optical x-y deflection system (5) so as to penetrate the housing (52) or window (51) and impinge on conductive patterns or electrodes (42) deposited on the piezoelectric substrate (41) of the device. The frequency characteristics of the device vary as the conductive material is caused to evaporate. The intensity and direction of the laser beam is controlled so as to bring the frequency characteristics, that is, resonant frequency, frequency response, etc., within specification. The device may be stored for a period of time between encapsulation and the final trimming procedures so as to substantially obviate significant short-term aging phenomena.
IPC 1-7
IPC 8 full level
H03H 3/04 (2006.01)
CPC (source: EP)
H03H 3/04 (2013.01)
Citation (search report)
- [X] US 3969640 A 19760713 - STAUDTE JUERGEN H
- [Y] GB 2040074 A 19800820 - HALLE FEINMECH WERKE VEB
- [X] INSTRUMENTS AND EXPERIMENTAL TECHNIQUES, vol. 17, no. 5 II, 9th October 1974, pages 1397-1398, New York, US; A.G. SMAGIN: "Frequency correction to 10-8 by ruby laser for precision quartz crystals"
- [A] LASER FOCUS, March 1970, pages 38-47, Newton, US; J.F. READY: "Selecting a laser for material working"
Designated contracting state (EPC)
AT BE CH DE FR GB LI LU NL SE
DOCDB simple family (publication)
WO 8400082 A1 19840105; EP 0111483 A1 19840627; EP 0111483 A4 19851219
DOCDB simple family (application)
US 8200823 W 19820614; EP 82902310 A 19820614