Microfilm scanning apparatus

Details Microfilm scanning apparatus Microfilm scanning apparatus

1992-04-14

1993-05-18

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359218, 358493, G02B 2608

Patent

active

052125815

ABSTRACT:
A microfilm scanning apparatus of the entrance scanner type has a microfilm, normally mounted in an aperture card which is mounted on a curved surface of a plano-convex cylindrical lens platten. The microfilm is scanned in one direction by radiant energy produced by a laser diode, scanning being effected by facets on a bevelled edge polygon mirror which is rotated by a motor. So as to perform scanning in a direction orthogonal to the scanning produced by the mirror, the platten is driven by a stepping motor. The curved surface of the platten is arranged to coincide with the loci of the focus of the scanning beam as the mirror rotates. By the provision of a curved surface platten, a simple spherical lens system may be interposed between the mirror and platten.

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patent: 3817593 (1974-06-01), Harris et al.
patent: 3828124 (1974-08-01), Baum
patent: 4268110 (1981-05-01), Ford

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