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. 09, 2006
Filed:
May. 13, 2005
Clinton B. Carlisle, Palo Alto, CA (US);
Jahja I. Trisnadi, Cupertino, CA (US);
Charles B. Roxlo, Saratoga, CA (US);
David A. Lehoty, Mt. View, CA (US);
Clinton B. Carlisle, Palo Alto, CA (US);
Jahja I. Trisnadi, Cupertino, CA (US);
Charles B. Roxlo, Saratoga, CA (US);
David A. Lehoty, Mt. View, CA (US);
Silicon Light Machines Corporation, Sunnyvale, CA (US);
Abstract
One embodiment relates to an optical displacement sensor for sensing transverse displacement of a data input device relative to a surface by determining displacement of optical features in a succession of frames. The sensor includes at least a coherent light source, illumination optics to illuminate a portion of the surface, imaging optics, and a first array of photosensitive elements having a periodic distance. The illuminator and the detector are configured to produce on the first array of photosensitive elements an intensity pattern of light reflected from the illuminated portion of the surface. The intensity pattern comprises a plurality of speckles having an average speckle diameter which is between one half and two times the periodic distance of the array.