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:
Oct. 05, 1993
Filed:
Jun. 12, 1991
Applicant:
Inventor:
Eric D Park, Carlsbad, CA (US);
Assignee:
BEI Electronics, Inc., San Francisco, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2502 / ; 25023114 ; 25022721 ; 324175 ;
Abstract
An optical apparatus for sensing the motion of an object. A light source transmits light through a first and second optical fiber. The first and second optical fiber are positioned on opposite sides of a modulator or code disk to face each other along an optical path. The modulator has alternating reflective regions and transmissive regions which modulate the light propagating along the optical path as the modulator moves across the optical path. The modulated light is received by the first and second and optical fibers and transported to a predetermined location for evaluation.