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:
Nov. 16, 2010
Filed:
Oct. 05, 2007
Gabor Szarvas, Budapest, HU;
Szabolcs Kautny, Budapest, HU;
Krisztian Banko, Ajka, HU;
Zoltan Karpati, Pecs, HU;
Gabor Szarvas, Budapest, HU;
Szabolcs Kautny, Budapest, HU;
Krisztian Banko, Ajka, HU;
Zoltan Karpati, Pecs, HU;
Thomson Licensing, Boulogne-Billancourt, FR;
Abstract
The present invention relates to a coaxial type apparatus for reading from and/or writing to holographic storage media with multiple reference beams. The invention further relates to a beam generator and a filter for use in such an apparatus. According to the invention, in an apparatus for reading from and/or writing to a holographic storage medium, with a coaxial arrangement of three or more focused reference beams and an object beam or a reconstructed object beam, the foci of the focused reference beams are arranged on a circle around the object beam in a Fourier plane of the apparatus. A beam generator generates the three or more reference beams from an incoming reference beam. A filter low-pass filters the object beam and rotates the polarization of the three or more reference beams.