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:
Feb. 15, 2011
Filed:
Aug. 24, 2006
Marcel Schemmann, Maria Hoop, NL;
Carsten Heinks, Nordhorn, DE;
Paraskevas Dunias, Eindhoven, NL;
Aalbert Stek, Eindhoven, NL;
Marcel Schemmann, Maria Hoop, NL;
Carsten Heinks, Nordhorn, DE;
Paraskevas Dunias, Eindhoven, NL;
Aalbert Stek, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method and optical module for measuring relative movement of an input device and object () along at least one measuring axis. A laser device () having a laser cavity is provided for generating a measuring beam () in respect of each measuring axis. The measuring beam () is used to illuminate the object () and measuring beam radiation reflected from the object () and re-entering the laser cavity generates a self-mixing effect in the laser and causes changes in operation of the laser cavity. A detector () is used to generate a measurement signal representative of these changes and an electronic processing circuit () selects, in dependence on the speed of relative movement, one of at least two parameters of the measurement signal for use in determining the speed and direction of relative movement.