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. 15, 2007
Filed:
Dec. 10, 2002
Ronald Reindert Drenten, Eindhoven, NL;
Peter Coops, Eindhoven, NL;
Petrus Theodorus Jutte, Eindhoven, NL;
Ronald Reindert Drenten, Eindhoven, NL;
Peter Coops, Eindhoven, NL;
Petrus Theodorus Jutte, Eindhoven, NL;
Koninklijke Philips Electronics N. V., Eindhoven, NL;
Abstract
An optical device for scanning an optical record carrier () has a radiation source () that can emit two radiation beams of different wavelength along different optical paths (). The emitted radiation is focused on the record carrier and reflected back to a detection system (). A beam combineris arranged in the optical path between the radiation source and the detection system for combining the two radiation beams on one optical path, thereby allowing the use of a single detection system for both radiation beams. The beam combiner includes a grating that passes one of the beams undiffracted and diffracts the other beam mainly in the first order. The profile of the grating lines show alternating slanting grooves and slanting lands.