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. 07, 2006
Filed:
Sep. 24, 2001
Petrus Theodorus Jutte, Eindhoven, NL;
Jacobus Maria Antonius Van Den Eerenbeemd, Eindhoven, NL;
Petrus Theodorus Jutte, Eindhoven, NL;
Jacobus Maria Antonius Van Den Eerenbeemd, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
In an optical scanning device for scanning both a high-density, HD, record carrier () and a low-density, LD, record carrier (), a two-wavelength diode laser () is used for generating the HD scanning beam and the LD scanning beam. By arranging a composite diffraction element () close to the diode laser (), which element has a first diffraction structure (), for combining the HD beam and the LD beam, and a second diffraction structure (), which acts as a lens for either the LD beam or the HD beam only, a compact device is obtained, which is suitable for writing the LD information layer ().