Patent ID: 8199628
Filing Date: 2012-06-12
Classification: G11B

Abstract:
1. An apparatus for reading from a multilayer holographic storage medium, with a coaxial arrangement of a reference beam and a reconstructed object beam, the apparatus comprising: 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 a wherein for re-collimating the reconstructed object beam the apparatus is adapted to shift the movable lens of the