Cassegrainian microfiche lens construction
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United States of America Patent
Stats
-
Aug 12, 1980
Grant Date -
N/A
app pub date -
Sep 13, 1976
filing date -
Sep 13, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microfiche construction embodying Cassegrainian reflecting surfaces. A fixed projection sheet is provided with convex lenses on its top surface, the lower peripheries of which are internally mirrored. An indexable lensfiche is provided with sunken convex reflecting mirrors on its top surface which are optically aligned with corresponding upper lens of the projection sheet to define Cassegrainian surfaces. Light modulated by microimages on the lensfiche strikes the Cassegrainian surfaces and passes to a viewing screen. In an embodiment, the projection sheet carries both Cassegrainian reflectors.
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Family
International Classification(s)
Cited Art Landscape
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