Optical recording medium

Details Optical recording medium Optical recording medium

2005-02-01

2005-02-01

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

06850476

ABSTRACT:
An optical recording medium includes recording tracks located adjacently to each other and is provided on and/or from which information is recorded and/or reproduced by irradiating with a beam a predetermined track of those recording tracks. The track pitch between the adjacent recording tracks is adjusted so that the track pitch is made substantially equal to a distance between an intensity center of a beam spot on a laser beam irradiated plane of the medium and a location of an initial minimum intensity. By irradiating with a beam the predetermined track, therefore, the beam intensity is located around the center of the recording track that is adjacent to the minimum portion. This location results in reducing a crosstalk amount from the adjacent recording track to a minimum, thereby suppressing the loss of the crosstalk characteristic to a minimum. This makes it possible to enhance the recording density in the alignment direction of the recording tracks if an A/W in the optical system is 1.0 or lower, in which A denotes an effective radius of an objective lens in the alignment direction of the recording tracks and W denotes a beam spot size on the objective lens in the alignment direction of the recording tracks.

REFERENCES:
patent: 5121378 (1992-06-01), Hirose et al.
patent: 5450237 (1995-09-01), Yoshida et al.
patent: 6618345 (2003-09-01), Kagawa et al.
patent: 0558052 (1993-09-01), None

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