Microform printer

Details Microform printer Microform printer

1988-10-14

1990-05-08

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 65, 354246, G03B 2740

Patent

active

049242598

ABSTRACT:
A broad magnification ratio range, microform to paper printing system includes a fixed focal length objective lens, a selectively adjustable short zoom mirror assembly, a selectively adjustable long zoom mirror assembly and optical switching means selectively to exclude or include the long zoom mirror assembly to provide the optical path length needed for the magnification ratio selected. The printing system may include an aperture shutter assembly positioned immediately adjacent the image slit of the optical system, the aperture shutter assembly having two blades operative to set the aperture width therebetween to control drum exposure and also operative selectively to close the aperture therebetween to block drum exposure.

REFERENCES:
patent: 4355891 (1982-10-01), Cole et al.
patent: 4750021 (1988-06-01), Holroyd et al.

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