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. 16, 2004
Filed:
Nov. 06, 2001
Martin Dieter Liess, Eindhoven, NL;
Aldegonda Lucia Weijers, Eindhoven, NL;
Olaf Thomas Johan Antonie Vermeulen, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An optical input device for an apparatus generates input signals by moving the device and an object ( ) relative to each other and measures the movement by the effects of self-mixing in a diode laser ( ) and Doppler shift caused by the movement. For each measuring axis (X, Y, Z), radiation from a diode laser ( ) is converged on a window ( ) across which the object ( ) moves. Part of the radiation scattered by the object, whose frequency is Doppler-shifted due to the movement, re-enters the laser cavity ( ) and causes a change in cavity properties. By measuring such a change, for example, by a photo diode, information about the movement is obtained. As the input device is small and cheap, it can be used in a number of different consumer apparatus.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile