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:
Jan. 31, 1984
Filed:
Jan. 29, 1982
Applicant:
Inventor:
Stephen M Fortescue, Canoga Park, CA (US);
Assignee:
Dataproducts Corporation, Woodland Hills, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08C / ;
U.S. Cl.
CPC ...
34087037 ; 324 / ; 3403 / ;
Abstract
A capacitive encoder utilizing a stationary plate having transmitter elements and receiver elements located on the surface thereof and a moving plate having two conductive areas separated by a sine wave shaped gap. The receiver elements on the stationary plate overlie the gap and provide outputs which vary as a function of the position of the gap with respect to the output elements. Signals from the output elements are differentially amplified and demodulated in order to provide precise sine and cosine outputs, the accuracy of which are unaffected by variations in the input signal.