Optical disk and optical disk apparatus

Details Optical disk and optical disk apparatus Optical disk and optical disk apparatus

2007-10-16

2007-10-16

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

Reexamination Certificate

active

10679273

ABSTRACT:
There is provided an optical disk which adopts a PRML (Partial Response and Maximum Likelihood) method for reproduction of recorded information and whose shortest pit has a conical shape without a bottom surface. If the PRML method is adopted, since it is not necessary to assure a large amplitude of a reproduction waveform of the shortest pit, the pit may have a conical shape. The conical pit enables recording with the dense shortest pit even in a conventional original disk recorder and original disk exposure process, thereby increasing a recording density in a dividing direction.

REFERENCES:
patent: 5946288 (1999-08-01), Ogawa
patent: 6556537 (2003-04-01), Endoh
patent: 6819650 (2004-11-01), Deno et al.
patent: 10-302310 (1998-11-01), None
patent: 10-302321 (1998-11-01), None
Chinese Office Action dated Dec. 24, 2004 for Appln. No. 03160195.2.
Japanese Office Action dated Nov. 9, 2004 for Japanese Patent Application No. 2002-294008.

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