Cassegrainian microfiche lens construction

Details Cassegrainian microfiche lens construction Cassegrainian microfiche lens construction

1976-09-13

1980-08-12

Shepperd, John W.

Optics: image projectors

Picture carrier

353 27R, 350201, G03B 2308

Patent

active

042170419

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.

REFERENCES:
patent: 2640393 (1953-06-01), Wreathall
patent: 3064526 (1962-11-01), Lindsay
patent: 3397362 (1968-08-01), Grayson et al.
patent: 3704068 (1972-11-01), Waly
patent: 3864034 (1975-02-01), Yevick

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