Optics: image projectors – Selective data retrieval – Film strip
Patent
1975-10-14
1978-04-04
Aegerter, Richard E.
Optics: image projectors
Selective data retrieval
Film strip
353 43, 353 74, 353 75, 353 82, 350241, 353 78, G03B 2312, G03B 2122
Patent
active
040824403
ABSTRACT:
A portable microform reader is provided with a microform carrier and a projection system for projecting an enlarged real image of the information carried on a portion of the microform onto a viewing screen. A binocular magnifying system is arranged for viewing the screen and for further enlarging the image thereon to produce a virtual image of acceptable reading size. The projection system comprises a source of illumination, a condenser lens, and a projection lens for projecting an image of the information carried on the microform onto the screen. The magnifying system may consist of appropriate binocular lenses where such lenses, in combination with prismatic converging means, produce the desired magnification. Beam splitting means may alternately be provided to eliminate the need for prismatic converging means, and a mirror arrangement may be provided to "fold" the projected beams for further limiting the size of the reader.
REFERENCES:
patent: 1349018 (1920-08-01), Terashima
patent: 2472259 (1949-06-01), McPherson
patent: 2485411 (1949-10-01), Pratt et al.
patent: 2517170 (1950-08-01), Bernard
patent: 2674919 (1954-04-01), Rodriguez
patent: 2735337 (1956-02-01), Frischmann
patent: 3072013 (1963-01-01), Pratt
patent: 3143920 (1964-08-01), Hawkins
patent: 3261977 (1966-07-01), Van Der Velden
patent: 3659933 (1972-05-01), Weitz
Aegerter Richard E.
Dresner Arthur
GAF Corporation
Kehm Walter C.
Shepperd John W.
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