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:
Mar. 05, 2013
Filed:
Jul. 25, 2007
Rick M. Tanaka, Vancouver, WA (US);
Algird M. Gudaitis, Vancouver, WA (US);
David K. Klaffenbach, Battle Ground, WA (US);
Rick M. Tanaka, Vancouver, WA (US);
Algird M. Gudaitis, Vancouver, WA (US);
David K. Klaffenbach, Battle Ground, WA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A system is provided that includes an encoder strip having encoder markings, first and second optical encoders positioned at a fixed distance from one another on a substrate and, responsive to being moved along the encoder strip, configured to generate first and second signals, respectively, that each indicate detection of the encoder markings on the encoder strip and processing circuitry configured to determine a current phase difference between the first and the second signals using a first portion of the first signal that corresponds to a first plurality of encoder markings and a second portion of the second signal that corresponds to a second plurality of encoder markings.