Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-03-20
1999-04-27
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 13, 369 4423, 369110, 369112, G11B 7007, G11B 1110
Patent
active
058986618
ABSTRACT:
An optical information storage unit for irradiating a light on a recording medium which has a recording surface with a land and a groove, and detecting a reproduced signal from a reflected light received from the recording medium, is constructed to include a first optical element separating the reflected light received from the recording medium into at least three bundles of rays, a second optical element compensating phases of the bundles of rays separated by the first optical element, and a third optical element detecting polarization states of the bundles of rays separated by the first optical element. An amount of phase compensation made by the second optical element is such that an absolute value of a difference between an amount of phase compensation required to reproduce a signal from the land and an amount of phase compensation required to reproduce a signal from the groove is greater than or equal to 60.degree. but less than or equal to 180.degree..
REFERENCES:
patent: 5519685 (1996-05-01), Kato et al.
patent: 5784347 (1998-07-01), Miyamoto et al.
Current Status & Future of Magneto-Optical Disks, Nobutake Imamura, MO Disk, Japan, 21st Aug., 1996, pp. 54-55.
Chu Kim-Kwok
Fujitsu Limited
Swann Tod R.
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