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:
Jun. 12, 2012
Filed:
Feb. 25, 2010
Joachim Knittel, Tuttlingen, DE;
Heiko Trautner, Unterkirnach, DE;
Joachim Knittel, Tuttlingen, DE;
Heiko Trautner, Unterkirnach, DE;
Thomson Licensing, Issy les Moulineaux, FR;
Abstract
An apparatus for reading from a multilayer holographic storage medium with a coaxial arrangement of a reference beam and a reconstructed object beam is described. The apparatus has an objective lens for focusing the reference beam into the multilayer holographic storage medium such that the reference beam has a focal point behind or in front of a reflective layer of the multilayer holographic storage medium, wherein a distance between the objective lens and the multilayer holographic storage medium is set in accordance with an addressed layer of the multilayer holographic storage medium, and an imaging system with a fixed lens of focal length f and a movable lens of focal length f for re-collimating a reconstructed object beam, wherein for a specific position of the movable lens the imaging system assumes aconfiguration. For re-collimating the reconstructed object beam the apparatus is adapted to shift the movable lens of theimaging system by substantially twice the shift of the objective lens necessary for addressing a specific layer of the multilayer holographic storage medium.