Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2006-06-27
2006-06-27
Korzuch, William (Department: 2653)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S053190, C369S044320, C369S283000
Reexamination Certificate
active
07068588
ABSTRACT:
An optical disk medium and a drive system are provided that enable high density recording to be carried out. In the optical disk medium, recorded information tracks are formed in a concentric or spiral manner, and information is recorded and played back by irradiating the recorded information tracks with a laser beam through a transparent substrate or a transparent cover layer. A change in tilt of the optical disk medium over one circuit of each of the tracks is set equal to or less than an allowed value, a change in tilt over the entire surface of the optical disk medium is permitted to be larger than the allowed value, and low frequency bandwidth tilt control is carried out by the drive system.
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K. Schep et al., “Format Description and Evaluation of the 22.5 GB DVR Disc”, International Symposium on Optical Memory 2000, Technical Digest, The Japan Society of Applied Physics, Sep., 2000, pp. 210-211.
Foley & Lardner LLP
Haley Joseph
Korzuch William
NEC Corporation
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