Magneto-optical recording medium and method and apparatus for re

Details Magneto-optical recording medium and method and apparatus for re Magneto-optical recording medium and method and apparatus for re

1997-08-25

1999-11-16

Edun, Muhammad

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369110, 369 13, G11B 700

Patent

active

059870028

ABSTRACT:
A magneto-optical recording medium formed to record an information signal on both of lands and grooves provides a capability of reproducing an excellent signal with a small magnitude of crosstalk even by narrowing a track interval more. In the magneto-optical recording medium, an optical depth d of each groove is in the range of (1/12+n/2).lambda..ltoreq.d.ltoreq.(1/6+n/2).lambda. or {-1/6+(n+1)/2}.lambda..ltoreq.d.ltoreq.{-1/12+(n+1)/2}.lambda., where .lambda. is a wavelength of a light beam to be applied onto the recording medium and n is an integer of 0 or more. When reproducing the information signal from the medium, a phase difference is given to the return light from the medium before detecting the return light.

REFERENCES:
patent: 5493552 (1996-02-01), Kobori
patent: 5602823 (1997-02-01), Aoki et al.
patent: 5648954 (1997-07-01), Satoh

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