Optical disc medium and optical disc device

Details Optical disc medium and optical disc device Optical disc medium and optical disc device

2007-02-12

2010-06-29

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Special groove

C369S278000

Reexamination Certificate

active

07746757

ABSTRACT:
Provided are a medium structure which allows track narrowing onto a three-dimensional pit selection type disc, and its corresponding optical disc device. Multiple data pit strings are formed between track guide grooves, and a phase-change recording film is formed only in the data pit strings. Thereby, a disc configuration is achieved. Reflectivity and a phase of each of a space portion and a mark portion are appropriately set. Thereby, normal resolution signal cancel is implemented to prevent deterioration in data crosstalk and a push-pull signal. An optical disc medium of the present invention is supported by an optical disc device having a configuration in which a signal is selected from a push-pull signal of a main beam and push-pull signals of sub-beams to read out wobble address information.

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