The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1985
Filed:
May. 02, 1984
Jean P Valentin, Pouilley-les-Vignes, FR;
Etat Francais, Paris Armees, FR;
Abstract
A temperature-compensated quartz oscillator having a first plate of quartz that carries a first electrode which displays a sensitivity to temperature that exceeds that of the piezoelectric quartz wafer which comprises a first resonator which vibrates at a reference frequency f.sub.M. The first plate cooperates with the first electrode and a third electrode to form a second quartz resonator. Means for applying to the first and third electrodes an excitation electric power to drive the active portion of the first plate according to a mode which is sensitive to temperture, at a frequency f.sub.T close to, but slightly different from, the reference frequency f.sub.M. Means for comparing, which enable comparison of signals at the terminals of the second and third electrodes, and control means for the regulating means for applying an excitation electric power from the active portion of the piezoelectric wafer.