Record Medium, Optical Disk Unit Using It, and Recording Method
AssigneePanasonic Corporation
InventorsShohei Inoue, Hideaki Horio, Taiichi Mori, Tetsuya Araki, Kouichi Bairin
Life of this patent
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Abstract
A plate body 2, multiple hologram layers 3 are provided in the thickness direction of the plate body 2, and at least one of the multiple hologram layers 3 is formed of spirally continuous hologram bands 4. Erasure areas 4A and 4B and non-erasure areas 4C and 4D of the hologram band 4 are provided in the length direction of the hologram band 4. Non-erasure areas 4E and 4F of the hologram band 4 are formed on both sides in the direction orthogonal to the length direction of the hologram band 4 in the erasure areas 4A and 4B.
Claims14
A record medium, comprising:
- a plate body;
- multiple hologram layers formed in a thickness direction of the plate body;
- and
- a hologram band formed in at least one of the multiple hologram layers, wherein an erasure area and a non-erasure area of the hologram band are provided in a length direction of the hologram band, and wherein the non-erasure area is formed on both sides in a direction orthogonal to the length direction of the hologram band in the erasure area.
A record medium recording method in a record medium comprising a plate body;
- multiple hologram layers formed in a thickness direction of the plate body;
- and a hologram band formed in at least one of the multiple hologram layers, the method comprising:
- forming an erasure area of the hologram band by applying circular light having a smaller diameter than a width in a direction orthogonal to the length direction of the hologram band.
A record medium comprising:
- a plate body;
- multiple hologram layers formed in a thickness direction of the plate body;
- and
- a hologram band formed in at least one of the multiple hologram layers, wherein the hologram band is formed with non-erasure areas on both sides of the hologram band and with an alternating pattern of an erasure area and a non-erasure area in a center of the hologram band.
Dependencies are inferred from the claim text.