Prism plates for compact optical viewers

Details Prism plates for compact optical viewers Prism plates for compact optical viewers

1980-11-03

1982-05-04

Evans, F. L.

Optics: image projectors

Plural projection paths with single light source

353 38, G02B 504

Patent

active

043279686

ABSTRACT:
A prism sheet for a compact microfiche reader. Light from a microfiche or cassette microfilm is projected and undergoes several reflections in the reader apparatus prior to striking a viewing screen. One of the reflecting surfaces is defined by the prism sheet of this invention, the sheet having a multiplicity of prisms. Light is both reflected by and passes through the prism sheet, the prism sheet thus defining a dual-function optical surface. This makes possible a more compact viewer.

REFERENCES:
patent: 1811946 (1931-06-01), Le Bailly
patent: 3177759 (1965-04-01), Wilks, Jr.

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