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:
Jun. 27, 2006
Filed:
May. 16, 2002
Peter Ferdinand Greve, Eindhoven, NL;
Olaf Thomas Johan Antonie Vermeulen, Eindhoven, NL;
Peter Ferdinand Greve, Eindhoven, NL;
Olaf Thomas Johan Antonie Vermeulen, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A projection device comprises a matrix () of semiconductor lasers, an optical system () for projecting the matrix () on an element () illuminated by the projection device, and a control device () for controlling the semiconductor lasers through a feedback device. The feedback device comprises a first detector () that generates a first signal representing the detected intensity. The semiconductor lasers are controlled and the intensity of the light spot is adjusted to a desired value by the feedback device. Light from a semiconductor laser is detected by a second detector (), and a value of the detected signal is stored in an addressable memory cell. The amount of emitted light is stabilized for each semiconductor laser by detection through the second detector () and comparison with the value stored in the memory () for the relevant controlled semiconductor laser.