Optical medium having grooves along recording tracks, and an...

Details Optical medium having grooves along recording tracks, and an... Optical medium having grooves along recording tracks, and an...

2007-07-31

2007-07-31

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

Reexamination Certificate

active

10478055

ABSTRACT:
An optical recording and reproducing medium has grooves formed thereon along recording tracks, this optical recording and reproducing medium being recorded and/or reproduced with irradiation of light having a predetermined wavelength λ. Since the grooves are composed of a first groove2and a second groove3shallower than the first groove2and the second groove3is disposed adjacent to both sides of the first groove2, a recorded signal can be suppressed from crossing the tracks and a sufficiently large amplitude amount of a push-pull signal can be obtained. Thus, an optical recording and reproducing medium can produce a stable tracking signal and hence a recording density can be increased.

REFERENCES:
patent: 6731589 (2004-05-01), Sakamoto et al.
patent: 2004/0151106 (2004-08-01), Endoh
patent: 5-282671 (1993-10-01), None
patent: 11-259909 (1999-09-01), None
U.S. Appl. No. 10/478,055, filed Nov. 18, 2003, Endoh.
U.S. Appl. No. 10/845,112, filed May 14, 2004, Endoh et al.
U.S. Appl. No. 10/508,089, filed Sep. 16, 2004, Endoh.

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