Method and apparatus for transferring a pattern on an overlying

Details Method and apparatus for transferring a pattern on an overlying Method and apparatus for transferring a pattern on an overlying

1974-08-20

1976-09-07

Church, Craig E.

Radiant energy

With infrared or thermal pattern recording

Thermal copying of documents

250319, 346 76L, G03C 516

Patent

active

039795918

ABSTRACT:
In the field of the storage and retrieval of information, information records in the form of patterns of microspots of small size and high packing density are formed on a record web by the use of a focussed first laser beam, of a first level of intensity, to evaporate or burn away material to form microperforations in a thin layer of opaque first material on a web of transparent plastic. This invention covers the process of preparing a facsimile record of the pattern of microspots on a master record by exposing a second record web through the microperforations in the first web to a constant intensity focussed second laser beam of less intensity than the first level of intensity. Also means are shown for using an optical pattern on a first layer to control a laser to burn openings into an opaque underlying layer.

REFERENCES:
patent: 2616961 (1952-11-01), Groak
patent: 3474457 (1969-10-01), Becker
patent: 3739088 (1973-06-01), Landsman
patent: 3832547 (1974-08-01), Silverman

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