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:
Jan. 15, 2013
Filed:
Sep. 24, 2010
Fabien Laulagnet, Fontaine, FR;
Marie-françoise Armand, Vaulnaveys le Haut, FR;
Alain Fargeix, Montbonnot Saint Martin, FR;
Bérangère Hyot, Eybens, FR;
Fabien Laulagnet, Fontaine, FR;
Marie-Françoise Armand, Vaulnaveys le Haut, FR;
Alain Fargeix, Montbonnot Saint Martin, FR;
Bérangère Hyot, Eybens, FR;
Commissariat a l'Energie Atomique, Paris, FR;
Abstract
The invention relates to the field of the optical recording of information on a medium, such as an optical disc. To read an optical disc in super-resolution mode, a procedure for optimizing the power of the read laser beam is implemented. This optimization is based on the observation that a correlation exists between the power allowing the disc to be read without risk in super-resolution mode and the reflectivity of the sensitive layer containing the information. The reflectivity of the optical disc is measured for several power levels of the read laser, a critical power is determined on the basis of the reflectivity measurements made, and a read power sufficiently above the critical power, so as to be well outside a range of power levels entailing risks, is selected according to the critical power.