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The Drexler Technology Corporation patent solves the following problem:
Optical data storage cards, reliability and ease of reading the data is important. Data can be recorded in an office environment, but should be read in a dirty environment or when no card reading machine is, like an emergency. For example, medical record cards should be read in an ambulance, the scene of an accident, or a war. In such circumstances, it may be difficult or impossible to read digital data recorded on a card or paper copies of a file.
Our analysis of this patent is as follows:
Drexler Technology Corporation’s patent US 4680459 A deals with Updatable micrographic pocket data card.
A strip of Optical contrast laser recording material would a wallet-size card, and laser written micrographic characters recorded thereon. The characters are formed in a matrix of laser spots traits recorded and read using twenty power lens. The characters are recorded in situ in the card, after you strip card would, by a laser with a beam focus of the strip. A light detector read the beam to confirm the laser writing. Raster-like or zig-zag scanning beam creates each character matrix. Each of the spots characteristic can be made with a laser spot or through a group of laser spots.
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