Hologram recording medium

Abstract

PROBLEM TO BE SOLVED: To provide a hologram memory medium in which positioning of a beam spot for recording information is accurately controlled with respect to a recording medium by simple configuration and in which shift multiplexing recording is performed while performing two-dimensional positioning control in tangential and radial directions of the recording medium. SOLUTION: The hologram memory medium in which positioning of a beam spot for recording information is accurately controlled with respect to a recording medium and in which shift multiplexing recording is performed while performing two-dimensional positioning control in tangential and radial directions of the recording medium is provided by forming a recording layer and a reflective layer between at least two substrates, continuously or intermittently arranging protrusions or recesses for optical positioning control on the substrate adjacent to the reflective layer, and making the reflective layer side shape of the substrate nearly flat.

Description

technical field [0001] The present invention relates to a recording medium, and more particularly, to a holographic recording medium on which data is recorded by using interference fringes of an object beam and a reference beam. Background technique [0002] Recently, a phase-shift type optical disk or a magneto-optical type optical disk is widely used as an information recording medium. In order to increase the recording density of such an optical disc, it is necessary to reduce the diameter of the beam spot and the distance between adjacent tracks or adjacent bits. [0003] Although the recording density of optical discs has increased, the diffraction limit of the light beams used to record data on the surface physically limits the recording density of optical discs. Therefore, three-dimensional multiplexing recording including the depth direction is required to increase the recording density of the optical disc. [0004] Therefore, a holographic...

AI Technical Summary

Problems solved by technology

[0003] Although the recording density of optical discs has increased, the diffraction limit of the light beams used to record data on the surface physically limits the recording density of optical discs.

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