Microform printer

Details Microform printer Microform printer

G - Physics

03

B

95/33

G03B 27/40 (2006.01) G03B 21/11 (2006.01)

Patent

CA 1315589

ABSTRACT OF THE DISCLOSURE 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 selective- ly 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.

608424

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