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. 22, 2012
Filed:
Jul. 29, 2005
Jason Grosse, Vancouver, WA (US);
Rick M. Tanaka, Vancouver, WA (US);
Steven B. Elgee, Portland, OR (US);
Jason Grosse, Vancouver, WA (US);
Rick M. Tanaka, Vancouver, WA (US);
Steven B. Elgee, Portland, OR (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
Disclosed are apparatus and methods for compensating for the change in length of an encoder strip due to environmental effects such as temperature and humidity. The apparatus and methods utilize two simple optical sensors spaced apart and mounted on a substrate having a different coefficient of thermal expansion than the encoder strip; the substrate is mounted to the movable component which is to be positioned, such as a printer carriage. Embodiments of the methods utilize information from the two sensors, in conjunction with information from the analog encoder used to position movable component, to compensate for environmental effects.