Patent ID: 8339921
Filing Date: 2012-12-25
Classification: G11B

Abstract:
1. An optical information recording apparatus to record information in a holographic memory, the optical information recording apparatus comprising; a laser light source generating a signal beam and a reference beam; a signal generation unit adding at least one control bit to an input data and generating a first 2-dimensional page data; a spatial light modulator adding the first 2-dimensional page data to the signal beam; and a control unit controlling the laser light source, the signal generation unit, and the spatial modulator so as to record the information by irradiating the signal beam that is added to the first 2-dimensional page data by the spatial light modulator and the reference beam in the holographic memory, wherein the signal generation unit adds the at least one control bit so as to keep a ratio of a number of pixels of a first brightness of the spatial light modulator to a number of pixels of a second brightness that is larger than the first brightness in the first 2-dimensional page data equal to a ratio of the number of pixels of the first brightness of the spatial light modulator to a number of pixels of the second brightness in a second 2-dimensional page data that is different from the first 2-dimensional page data, the first 2-dimensional data and the second 2-dimensional data being recorded in the holographic memory.