Patent · US Expired

Piezoelectric crystal element

US5369327A · kind A · utility

4Cited by

10References

9Claims

0Family size

Assignee

Avl Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List · AT

Inventors

Wolfgang Wallnofer · Graz, AT
Peter W. Krempl · Leibnitz, AT

Key dates

Filing date	Feb 17, 1994
Grant date	Nov 29, 1994
Priority date	—
Expiry date	Feb 17, 2014

Classification

Technology area (CPC H)Electricity
CPC primaryH03H9/02543
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

For surface acoustic wave devices temperature-compensated piezoelectric crystal elements with one or more planar faces are used. An improvement in temperature stability may be expected if the crystal element is made from GaPO.sub.4 and the planar face is defined by Euler angles .lambda. in the range of 0.degree., .mu. in the range of 40.degree. to 75.degree., i.e. preferably 50.degree. to 60.degree., and .theta. in the range of 0.degree..

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.