System for checking the recoding state of data on a magneto-opti

Details System for checking the recoding state of data on a magneto-opti System for checking the recoding state of data on a magneto-opti

1998-06-25

1999-12-21

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369112, G11B 1100, G11B 700

Patent

active

060058307

ABSTRACT:
A device for checking the recording state of a magneto-optical recording disk includes a detector for detecting a s-polarized light component and a p-polarized light component from a reflected light reflected from the portion of the magneto-optical recording disk. One of the s-polarized and p-polarized light components is subtracted from the other to produce a difference signal and the s-polarized and p-polarized light components are added to produce an addition signal. The difference signal is divided by the addition signal to produce a normalized detection signal. The recording state is determined based on a level change of the normalized detection signal while data is being recorded onto the magneto-optical recording disk.

REFERENCES:
patent: 4729122 (1988-03-01), Itoh
patent: 5559769 (1996-09-01), Ando et al.
patent: 5726962 (1998-03-01), Okada et al.

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