Method of writing data on optical card by projecting thereon int

Details Method of writing data on optical card by projecting thereon int Method of writing data on optical card by projecting thereon int

1988-03-10

1990-01-16

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369116, 235454, 235438, G11B 7125, G06K 500, G06K 710

Patent

active

048948179

ABSTRACT:
A method of writing data in a track on a optical card by projecting a writing laser beam whose output power is modulated in accordance with the data to be recorded, wherein immediately after writing the data with the aid of the writing laser beam having a nominal value A.sub.3, the data is read out of the optical card and confirmed whether the data has been correctly written or not. If the data is not correctly written on the optical card, the same data is written again in another track on the optical card with the aid of the writing laser beam whose output power is changed to a higher level A.sub.4. Immediately after this second writing, the data is read out of the optical card to check whether the data has been correctly recorded or not. The data writing operation is repeated by a predetermined number of times by changing the level of the output power of the writing laser beam successively in the order of A.sub.3, A.sub.4, A.sub.2, A.sub.5, A.sub.1, wherein A.sub.1 <A.sub.2 <A.sub.3 <A.sub.4 < A.sub.5 and A.sub.3 is the nominal level of the output power of writing laser beam.

REFERENCES:
patent: 3983317 (1976-09-01), Glorioso
patent: 4488277 (1984-12-01), McFarlane et al.
patent: 4538257 (1985-08-01), Klinger
patent: 4571716 (1986-02-01), Szerlip
patent: 4603414 (1986-07-01), Ackerman et al.
patent: 4611318 (1986-09-01), Winslow
patent: 4631713 (1986-12-01), Romeas et al.
patent: 4680456 (1987-07-01), Drexler
patent: 4685097 (1987-08-01), van der Put
Patent Abstracts of Japan, vol. 11, No. 40 (P-544) [2487], 61-208671, Canon, Inc., Takehiko Shibata.

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