US 7,804,757 B2 · Hologram recording and reproducing apparatus

Abstract

A hologram recorder/player includes recording beam modulation controller which causes a spatial light modulator to modulate the recording beam in such a way that a hologram is recorded in a plurality of blocks in a unit recording region and that each of the blocks includes recording information (DATA) and error correction code, at a time of recording. The hologram recorder/player includes incident angle variable controller which varies a reference beam incident angle to a plurality of predetermined angles with respect to the unit recording region. The recording beam modulation controller causes the modulation of the recording beam in such a way that a different hologram is generated for a page each time the reference beam incident angle is varied and that the hologram in each page is recorded in a plurality of the blocks.

Claims7

Dependent claims

A hologram recorder/player for recording a hologram in a recording medium and for replaying the hologram recorded in the recording medium comprising:

a light source emitting laser;
a beam splitter splitting the laser into a recording beam and a reference beam;
a spatial light modulator modulating the recording beam in a unit recording region;
a first optical system for illuminating the hologram recording medium with the modulated recording beam;
a second optical system for illuminating the hologram recording medium with the reference beam;
and
a photo detector detecting light from the hologram recording medium;
wherein the spatial light modulator is used for writing the hologram into the unit recording region of the hologram recording medium as a plurality of blocks,
wherein each of the plurality of blocks includes recording information and at it one of an error correction code and an error detection code which corresponds to the recording information.

6 more elements

Dependencies are inferred from the claim text.

Hologram recording and reproducing apparatus

Life of this patent

Hologram recording and reproducing apparatus

Life of this patent

Abstract

Claims7