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:
Aug. 02, 2011
Filed:
Jul. 10, 2008
Applicants:
Frank Przygodda, Villingen-Schwenningen, DE;
Joachim Knittel, Tuttlingen, DE;
Inventors:
Frank Przygodda, Villingen-Schwenningen, DE;
Joachim Knittel, Tuttlingen, DE;
Assignee:
Thomson Licensing, Boulogne-Billancourt, FR;
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a phase mask for holographic data storage, and to a method and an apparatus for reading from and/or writing to holographic storage media using such a phase mask. According to the invention, the phase mask has a plurality of phase cells, whose size is equal to an integer multiple of the size of the pixels of a spatial light modulator of the apparatus. The phase cells have a phase variation on sub-cell scale, which is inverse for essentially half the number of phase cells.