Microform reader

Details Microform reader Microform reader

1978-11-14

1981-01-27

Shepperd, John W.

Optics: image projectors

Cabinet encloses projector and one side of screen

Reflector between lamp and screen

350128, 350241, G03B 2122

Patent

active

042471850

ABSTRACT:
A pocket-sized microform reader is realized by employing a unique lenticular (screen) assembly and a projection lens assembly, the latter permitting a fold in the middle of an optical path allowing the size requirements of such a reader to be met. The cooperation between the lenticular screen and the projection lens assemblies permits sufficient brightness to be obtained and the lenticular screen assembly defines a non wasteful exit pupil of limited dimensions consistent with a pocket-sized reader.

REFERENCES:
patent: 2124587 (1938-07-01), Morrissey
patent: 2326042 (1943-08-01), Lessman
patent: 3319517 (1967-05-01), Rondas et al.
patent: 3658415 (1972-04-01), Miles
patent: 3711188 (1973-01-01), Zehnpfennig
patent: 3848980 (1974-11-01), Plummer
patent: 3941467 (1976-03-01), Kapany et al.

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