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:
Feb. 16, 1993
Filed:
Dec. 06, 1990
Syuichi Mitsutsuka, Tokyo, JP;
Clarion Co., Ltd., Tokyo, JP;
Abstract
A control apparatus for a surface acoustic wave convolver element having a gate electrode, a grounded electrode and a piezoelectric layer therebetween. A bias voltage variable within a predetermined range is applied to the gate electrode so as to cause the convolver element to operate at the optimum convolution efficiency. A first mode signal is output when the variable bias voltage is in the proximity of either end of the predetermined range, and a second mode signal is output when the variable bias voltage is in a range defined by excluding the first range from the predetermined range. The variable bias voltage is applied to the convolver element when the second mode signal is output. When the first mode signal is output, the characteristics of the convolver element are controlled at an increased rate relative to a control rate when said variable bias voltage is used.