Optical information processing method and optical information reproducing method using multiplexing schemes capable of improving a density of recorded optical information
View Patent ↗Provided are optical information processing apparatus and method. In the optical information processing apparatus and method, when the recording regions in which optical information is recorded in an angular multiplexing scheme overlap with each other, a recording angle and a recording position for optical information is adjusted so as to improve reproducing efficiency of readout beams reproduced from the overlap recording regions, so that heights of “null” for diffraction energy reproduced from the recording regions and overlap recording regions can be lowered. Accordingly, it is possible to reduce crosstalk noise during the recording and producing of the optical information and to improve optical information recording quality and reproducing efficiency.
1. An optical information processing method comprising steps of:
forming a plurality of first recording regions by allowing a first signal beams and a first reference beam having multiple incidence angles in a first incidence angle range for one position to be incident to a plurality of positions of a storage medium, wherein border parts of incidence regions of the first reference beam corresponding to multiple incidence angles are formed in a hierarchical pattern, wherein the first recording regions are formed to be separated from each other;
forming each of a plurality of second recording regions between the first recording regions by allowing a second signal beams and a second reference beam having multiple incidence angles in a second incidence angle range for one position to be incident to a plurality of positions, so that the first recording regions and the second recording regions do not overlap with each other, wherein the second recording regions are formed to be separated from each other and partially overlap with the border parts of the first reference beam; and
forming each of a plurality of partial an overlap recording regions by allowing a third signal beam and a third reference beam having multiple incidence angles in a third incidence angle range different from the first and second incidence angle range to be incident to a position so that first portion of the partial overlap recording region partially overlaps with the first recording region and second portion of the partial overlap recording region partially overlaps with the second recording region.
2. The optical information processing method according to claim 1 , wherein the second recording regions are formed at the positions where the border parts of incidence regions of the first reference beams partially overlap with other border parts of incidence regions of the first reference beam incident to adjacent first recording regions.
3. The optical information processing method according to claim 1 , wherein incidence regions of the first reference beam do not overlap with each other.
4. An optical information reproducing method comprising steps of:
allowing a first reference beam to be incident to first recording regions of a storage medium at multiple changed incidence angles in a first incidence angle range to reproduce optical information from the first recording regions so that border parts of incidence regions of the first reference beam overlap with second recording regions, wherein the first recording regions are formed to be separated from each other;
allowing the second reference beam to be incident to the second recording regions of the storage medium at multiple changed incidence angles in a second incidence angle range to reproduce optical information from the second recording regions, wherein the first recording regions and the second recording regions do not overlap with each other, wherein the second recording regions are formed to be separated from each other; and
allowing a third reference beam to be incident to partial overlap recording regions of the storage medium at multiple changed incidence angles in a third incidence angle range different from the first and second incidence angle range to reproduce optical information from the partial overlap recording regions, wherein first portion of the partial overlap recording region partially overlaps with the first recording region and second portion of the partial overlap recording region partially overlaps with the second recording region.
5. The optical information reproducing method according to claim 4 , wherein the second recording regions are formed at the positions where the border parts of incidence regions of the first reference beam partially overlap with other border parts of incidence regions of the first reference beam incident to adjacent first recording regions.
6. The optical information reproducing method according to claim 4 , wherein incidence regions of the first reference beam do not overlap with each other.