Compact optical viewer for microfiche or cassette

Details Compact optical viewer for microfiche or cassette Compact optical viewer for microfiche or cassette

1977-11-22

1979-11-06

Haroian, Harry N.

Optics: image projectors

Cabinet encloses projector and one side of screen

Reflector between lamp and screen

353 38, G03B 2128

Patent

active

041733991

ABSTRACT:
A compact microfiche reader. Light from a microfiche or cassette microfilm is projected and undergoes several reflections prior to striking a viewing screen. One of the reflecting surfaces is defined by a prism 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. Several embodiments employ foldable reflecting surfaces and a foldable viewing screen to further reduce the size of the reader.

REFERENCES:
patent: 3667839 (1972-06-01), Artaud
patent: 3920322 (1975-11-01), Peters

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