Microform printer
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United States of America Patent
Stats
-
May 8, 1990
Grant Date -
N/A
app pub date -
Oct 14, 1988
filing date -
Oct 14, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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