The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 1990
Filed:
Mar. 10, 1988
Olympus Optical Co., Ltd., , JP;
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.