Optical information storage unit having phase compensation means

Details Optical information storage unit having phase compensation means Optical information storage unit having phase compensation means

1998-03-20

2000-09-12

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369 4424, G11B 700

Patent

active

061187488

ABSTRACT:
An optical information storage unit irradiates a light on a recording medium having a recording surface provided with a land and a groove and detects a reproduced signal from a light reflected from the recording medium. The optical information storage unit is provided with a phase compensation mechanism, provided in an optical path through which the light irradiated on the recording medium and a reflected light from the recording medium passes, for applying with respect to the reflected light a first phase compensation quantity required to detect a signal from the land and a second phase compensation quantity required to detect a signal from the groove.

REFERENCES:
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patent: 5519685 (1996-05-01), Kato et al.
patent: 5530641 (1996-06-01), Kanehira
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patent: 5831942 (1998-11-01), Morimoto et al.
patent: 5910937 (1999-06-01), Akiba et al.
"Current Status & Future of Magneto-Optical Disks" by Nobutake Imamura, MO Disk, Japan, Aug. 21, 1996, pp. 54-55.

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