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Document Type and Number:
Japanese Patent JP3361078
Kind Code:
PROBLEM TO BE SOLVED: To increase track density of an optical recording medium and to increase the recording capacity of the medium. SOLUTION: This optical recording medium is an optical recording medium irradiating a read-out light beam onto the optical recording medium in which a phase pit is formed and a reflectance of which is changed by a temp. and which reads the phase pit while partially changing the reflectance in a scan spot. A track pitch(p) of a pit RP of a recording signal in the direction orthogonally intersecting with a scan direction of a laser beam is made 1/2 or below of the spot diameter D of the laser beam.

Atsushi Fukumoto
Toshiki Udagawa
Shunji Yoshimura
Masumi Ohta
Masumi Ono
Koichi Yasuda
Application Number:
Publication Date:
January 07, 2003
Filing Date:
August 30, 1999
Export Citation:
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International Classes:
G11B7/007; G11B7/24; G11B7/24035; G11B7/24079; G11B7/24085; (IPC1-7): G11B7/24; G11B7/007; G11B7/24
Domestic Patent References:
Other References:
Attorney, Agent or Firm:
Akira Koike (2 outside)

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