Optical recording medium with visible pattern formed in ROM area
OwnerAkira Shimofukuinventor
Life of this patent
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Abstract
A disk-type optical recording medium is disclosed that has a visible pattern in its read-only area. The visible pattern is produced making use of change in reflectance of the disk, which is caused by change in product W*L of a width (W) and a length (L) of an nT pit formed in the read-only area, where n denotes a natural number, and T denotes clock time.
Claims27
An optical recording medium having a visible pattern in a read-only area of a disk, the visible pattern being produced making use of change in reflectance of the disk caused by change in product W*L of a width (W) and a length (L) of an nT pit formed in the read-only area, where n denotes a natural number and T denotes clock time.
An optical recording medium comprising:
- a substrate having a read-only area in which pits are formed such that a product W*L of a width (W) and a length (L) of an nT pit varies according to a prescribed manner, where n denotes a natural number and T denotes clock time.
A method of fabricating an optical recording medium comprising the steps of:
- preparing a stamper having a prescribed pit pattern;
- and
- forming a disk using the stamper, the disk having the pit pattern in a prescribed area in which a product W*L of a width (W) and a length (L) of an nT pit varies, where n is a natural number and T denotes clock time.
A stamper used to fabricate a substrate of an optical recording medium, wherein the stamper has a prescribed pit pattern in at least a portion thereof, the pit pattern being formed such that a product W*L of a width and a length of an nT pit forming the pit pattern varies, where n is a natural number and T denotes clock time.
Dependencies are inferred from the claim text.