Apparatus and process for photographically duplicating...

G - Physics – 03 – B

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G03B 27/04 (2006.01) G03G 16/00 (2006.01)

Patent

CA 1110895

ABSTRACT Process and apparatus for duplicating on microfiche the intelligence appearing on a photoplastic microfiche master by irradiating the duplicate through the master with high intensity moderately collimated light. Photoplastic film having a relatively thick thermoplastic layer is used as the master. The master and the duplicate are separated by a gap of predetermined size, which gap can be filled by air, plastic, glass or any other transparent medium. Multiple light sources isolated from one another, are used and pro- vision is made for absorbing and dissipating some of the heat before the light reaches the master. Means are pro- vided for assuring relatively uniform light intensity across the entire recording face and for assuring consistent ir- radiation of the duplicate irrespective of lamp age or line voltage variations.

320139

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