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AssigneeSharp Kabushiki Kaisha
InventorsHirotsugu Matoba, Toshihisa Deguchi, Shigeo Terashima, Hideyoshi Yamaoka
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In the optical recording element of the invention, alignments of long thin pits inclined in various directions with respect to the track direction are formed on the tracks and information is recorded therein according to the different inclines of the pits, thereby performing higher-density and larger-volume recording without reducing the spacing between each pit and the track pitch. The invention also discloses an optical data retrieval system for use with the above optical recording element, which scans the pit alignments with a laser beam spot, detects the inclines of the pits by obtaining the distribution of the intensity of reflected light which is caused by light diffraction at the pits, and plays back information in accordance with the inclines. Therefore, not only can the substantially same structure as that of a standard type optical data retrieval system be applied to the invention without making any complicated change, but also cross-talk is less likely to be produced in the read out signals.
An optical data retrieval system for playing back of information from an optical recording element having a plurality of track elements extending end to end in a track direction and a recording surface on one side thereof, each track element having a plurality of elongated pits coplanar with the recording surface and angled within a full range of 360 degrees with respect to the track direction, the optical recording element being designed such that information is recorded therein according to the respective angle of each of the pits to the track direction, comprising:
An optical recording element for storing information, comprising:
An optical data retrieval system for playing back of information from an optical recording element having a substrate and a plurality of track elements extending end to end in a track direction, each of the track elements having a plurality of elongated pits coplanar with a recording surface parallel to the substrate, each of the pits being angled with respect to the track direction, the angle being selected from a plurality of angles predetermined within 360 degrees so as to assign at least two bits to each of the pits, comprising:
Dependencies are inferred from the claim text.