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:
May. 07, 2013
Filed:
Feb. 23, 2010
Applicant:
Christopher C. Chang, Brentwood, CA (US);
Inventor:
Christopher C. Chang, Brentwood, CA (US);
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01D 5/34 (2006.01); G01D 5/36 (2006.01); G06M 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical encoder and method for measuring displacement information uses an encoder member that includes multiple optical tracks of diffractive optical regions having different periodicities with respect to consecutive identical diffractive optical regions to produce diffracted beams of light from at least one beam of light emitted from a light source. The diffracted beams of light are received at photodetectors, which produce electrical signals in response to the received beams of light. The electrical signals are related to the displacement information being measured.