Patent ID: 7688699
Filing Date: 2010-03-30
Classification: G11B

Abstract:
1. A holographic recording apparatus for recording a piece of data on a holographic medium in a form of a flat plate which includes a recording layer comprising a photosensitive material and for which recording is achieved by an interference pattern of a coherent light beam, the apparatus comprising: a pickup including an objective lens which focuses the coherent light beam, for moving the objective lens along a recording track of the holographic recording medium and detecting reflected light from the recording track to perform focus- and tracking-servo control, and for detecting a marker provided in the holographic recording medium based on reflected light from the marker to generate a marker detection signal; a relative velocity determination unit for determining, using the marker detection signal, a relative velocity of a converging position of the objective lens with respect to the holographic recording medium; a driving unit for driving the objective lens or a mirror arranged in an optical path of the coherent light beam to the objective lens; and a control unit, which performs recording on the recording layer while detecting the marker, for performing control of the driving unit based on the relative velocity such that the converging position of the objective lens tracks the marker.