Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-04-09
1999-08-31
Tran, Thang V.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4441, 3692754, G11B 700
Patent
active
059462833
ABSTRACT:
An optical information recording medium comprises tracks having information recorded thereon as a mark portion where information is readable by irradiation of a light beam and a non-mark portion, wherein a first track whose optical phase difference between the mark portion and the non-mark portion is about .lambda. (1/4+k/2) and a second track whose optical phase difference between the mark portion and the non-mark portion is about .lambda. (1/8+m/4)(k and m are integers of 0 or more) are alternatively arranged when a wavelength of the optical beam is set to .lambda..
REFERENCES:
patent: 4963464 (1990-10-01), Setani
patent: 5168490 (1992-12-01), Braat
patent: 5493552 (1996-02-01), Kobori
patent: 5553051 (1996-09-01), Sugiyama et al.
K. Kayanuma et al., "High Track Density Magneto-Optical Recording Using A Crosstalk Canceler", SPIE, vol. 1316, 1990, pp. 35-39.
S. Wadaya et al., "New Equalization For Digital Recording and Application To High Capacity FDD", The Institute of Electronics, Information & Communication Engineers.
Kobori Hiromichi
Watabe Kazuo
Kabushiki Kaisha Toshiba
Tran Thang V.
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