Patent ID: 8149486
Filing Date: 2012-04-03
Classification: G11B,H03M

Abstract:
1. A recording apparatus for carrying out recording on a hologram recording medium on which data are recorded as interference fringes of reference light and signal light, comprising: a spatial light intensity modulator configured to carry out spatial light intensity modulation in a unit of a pixel; a spatial light phase modulator configured to carry out spatial light phase modulation in a unit of a pixel; an optical system configured to introduce light emitted from a light source to the hologram recording medium through the spatial light intensity modulator and the spatial light phase modulator; a convertor configured to convert an input data train formed from combinations of two different values into another data train formed from combinations of three or more different values; and an amplitude and phase controller configured to control a light intensity and phase of each of the pixels of the spatial light intensity modulator and the spatial light phase modulator in response to each of the values of the another data train obtained from the converter, wherein the converter carries out a modulation process according to a method using both amplitude and phase data or a method using a plurality of phase data displaced from each other to convert the input data train into combinations of in-phase data and quadrature data, and the amplitude and phase controller is configured to perform control so that the light intensity and the phase of each of the pixels of the spatial light intensity modulator and the spatial light phase modulator may be a predetermined light intensity and a predetermined phase which correspond to a combination of the in-phase data and quadrature data obtained by the convertor.