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:
Nov. 24, 1992
Filed:
Apr. 29, 1991
Applicant:
Inventors:
Horst A Gempe, Phoenix, AZ (US);
William S Cumberledge, Scottsdale, AZ (US);
David L Vowles, Phoenix, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P / ;
U.S. Cl.
CPC ...
356 28 ; 324175 ;
Abstract
A detector for sensing speed/direction of movement of apparatus including a reticle with alternate transparent and opaque portions coupled to the apparatus and having a light source mounted on one side and two spaced apart light sensors on the other side, which sensors produce alternate output signals with movement of the reticle. The sensor output signals are differentially compared to produce a digital output signal with a constant duty cycle. A second pair of light sensors is utilized to produce quadrature digital signals.