Method for verifying accuracy of data written on a phase transit

Details Method for verifying accuracy of data written on a phase transit Method for verifying accuracy of data written on a phase transit

1997-06-27

1999-08-31

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

G11B 700

Patent

active

059462809

ABSTRACT:
The writing and reading of optical data is made using an optical data writing medium and a single light spot, and the verification is made simultaneously with the writing of data. A phase transition optical disk is used as the optical data writing medium. The verification is made by checking magnitude of I.sub.w .times.(P.sub.r /P.sub.w) and that of I.sub.r, wherein I.sub.w is a return light dose from the optical data writing medium during writing, I.sub.r is a return light dose from the optical data writing medium in a crystal state of the writing film, P.sub.w is laser power during writing, and P.sub.r is laser power during reading. The device for writing and reading optical data includes a divider for dividing a return light dose I.sub.w from the optical data writing medium during writing by P.sub.w /P.sub.r, and a comparator for judging magnitude of I.sub.w .times.(P.sub.r /P.sub.w) and that of a return light dose from the optical data writing medium. The verification by a single beam spot while data is being written enables the reduction of writing time.

REFERENCES:
patent: 4621352 (1986-11-01), Kato
patent: 4727531 (1988-02-01), Ito et al.
patent: 5341359 (1994-08-01), Birukawa et al.
patent: 5428586 (1995-06-01), Kobayashi et al.
patent: 5495466 (1996-02-01), Dohmeier et al.
patent: 5517471 (1996-05-01), Ashimuma

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