Patent ID: 9076464
Filing Date: 2015-07-07
Classification: G11B

Abstract:
1. An optical information recording apparatus for recording information using holography, apparatus comprising: a laser light source that generates a signal beam and a reference beam; a spatial light modulator that modulates the generated signal beam; an objective lens that irradiates the modulated signal beam to an optical information recording medium; 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 at least a first direction of pixels in the spatial light modulator is K (K≧2, K: natural number); and a filter that limits a size of the signal beam irradiated to the optical information recording medium, and wherein a wavelength of the laser light source is λ, a focal length of the objective lens is f, a pixel size of the spatial light modulator is Δ, and a size of the limited signal beam by the filter in the first direction is less than f*λ/Δ, and wherein the two-dimensional data is recorded as a hologram by an interference stripe pattern that is generated when the signal beam from the objective lens and the reference beam are overlapped in the optical information recording medium.