Optics: image projectors – Selective data retrieval – Film strip
Patent
1976-10-20
1981-03-31
Stephan, Steven L.
Optics: image projectors
Selective data retrieval
Film strip
352 78R, 353120, G03B 2312, G03B 2100
Patent
active
042589860
ABSTRACT:
A cord is wound on and off of a pair of drums in a microfilm reader. The cord comprises a strip of microfilm of approximately 1 mm width, encapsulated in a transparent material to protect the film from scraping, scratching and the like as the same moves through a microfilm reading apparatus. The film may be processed in a variety of techniques to record information thereon, and after the recording process the film is encapsulated between a pair of translucent members into a cord which is then wound upon one of the drums and attached at one end to the other drum. The two drums carrying the cord are mounted in a capsule which is a replaceable component of a microfilm reader. Each of the drums is provided with a driven gear and the reader is provided with a pair of driving gears for engagement with respective ones of the driven gears. Additional pairs of drums may be utilized for larger installations in which the information content of the plurality of cords is classified and divided with respect to any desired criteria, such as a catalog or a metropolitan telephone directory which is divided into residential, buying guide, and commerical/industrial directories.
REFERENCES:
patent: 3262357 (1966-07-01), Warzynski et al.
patent: 3319517 (1967-05-01), Rondas et al.
patent: 3523657 (1970-08-01), Hearon et al.
patent: 3627619 (1971-12-01), Fromm
patent: 3684635 (1972-08-01), Staats
patent: 3693983 (1972-09-01), Lemelson
patent: 3841745 (1974-10-01), Kaye et al.
patent: 3862799 (1975-01-01), Smith et al.
patent: 3950652 (1976-04-01), Yamashita
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