Patent ID: 8379500
Filing Date: 2013-02-19
Classification: G11B

Abstract:
1. An optical information apparatus to record an information using holography, comprising: a laser light source that generates a signal beam and a reference beam; a spatial light modulator that modulates the signal beam; a filter that limits the signal beam; an objective lens that irradiates the signal beam to an optical information recording medium; an angle controller that controls an incident angle of the reference beam into the optical information recording medium; and a signal generation unit that generates two-dimensional data by a two-dimensional encoding method in which a lower-limit of a number of continuous ON/OFF pixels in an array in one direction of pixels in the spatial light modulator is K (K≧2, K: natural number), wherein the two-dimensional data is recorded as a hologram by an interference stripe pattern that is generated when the signal beam and the reference beam are overlapped in the optical information recording medium, and the signal generation unit switches the lower-limit of a number of continuous ON/OFF pixels in an array in one direction of pixels in the spatial light modulator is K (K≧2, K: natural number) according to a recording region and a kind of the optical information recording medium.