Phase detected direct read during write

Details Phase detected direct read during write Phase detected direct read during write

1996-06-19

1998-07-21

Hindi, Nabil

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

G11B 700

Patent

active

057843481

ABSTRACT:
An optical recording system for recording data on an optical medium comprising: an optical source capable of providing at least one write pulse incident upon the optical medium; a direct read during write (DRDW) verification and control system within the optical source having a capability of measuring light reflected from the optical medium into a return beam aperture, the DRDW system including a plurality of detectors configured to receive light from different areas of the return aperture; and a comparison circuit for comparing light received in different portions of the return aperture.

REFERENCES:
patent: 5406540 (1995-04-01), Longman et al.
patent: 5440534 (1995-08-01), Eastman et al.
patent: 5446716 (1995-08-01), Eastman et al.
patent: 5491682 (1996-02-01), Dohmeier et al.
patent: 5495466 (1996-02-01), Dohmeier et al.
patent: 5537383 (1996-07-01), Gange et al.
patent: 5561645 (1996-10-01), Eastman et al.
patent: 5629921 (1997-05-01), Eastman et al.

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