Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2007-07-03
2007-07-03
Psitos, A (Department: 2653)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
Reexamination Certificate
active
09406570
ABSTRACT:
An optical information recording medium and a method of mastering an optical information recording medium. Cross-talk is avoided even when phase pits flanking a groove are radially aligned so that preformat information can be reliably reproduced after information is recorded at the grooves. A phase pit that encodes preformat information for a groove is radially spaced from that groove by a partition wall but is connected to an adjacent groove. When mastering, respective first and second exposing light beams are used to form the grooves and the phase pits, and the spacing between the two beams and, therefore, the width of the partition walls in the radial direction is precisely and easily controlled by controlling the inclination angle of at least one of the beams relative to an objective lens in the mastering exposure system.
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Abstract of JP 09/230696 published May 9, 1997.
MAT (Machine assisted translation) of JP 11-066630.
Shimizu Akihiko
Yokoi Kenya
Cooper & Dunham LLP
Psitos A
Ricoh & Company, Ltd.
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