Optics: image projectors – Selective data retrieval – Film strip
Patent
1976-08-03
1978-08-29
Stephan, Steven L.
Optics: image projectors
Selective data retrieval
Film strip
235463, 235487, 250570, 353 27A, G03B 2312, G03B 2308, G06K 710, G06K 1900
Patent
active
041100204
ABSTRACT:
An electronically controlled photographic image utilization device is arranged to transport a roll of microfilm having all images printed thereon in separate photographic areas, each area being arranged in a microfiche-type format. The photographic image utilization device has an automatic call-up feature so that any given photographic area may be selected and projected responsive to the push of a button, the operation of a rotary switch or both. A special bar code is printed along the edge of the film and used in conjunction with a closed loop film control system to eliminate the need for precise, clock controlled synchronization between the film transport and the code reading. Preferably, the bar code is read by optical electronic sensors. Responsive thereto, the electronic control system accurately positions a selected photographic image, on the microfilm, within a viewing area. Thereafter, and while the film transport is being held stationary, any image on the microfilm may be selected for projection by a manual movement of a simple lens positioning mechanism which is small, compact, and easily moved. The reader may also be operated manually so that the automatic controls may be bypassed, if desired.
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Erikson Rolf B.
Flint John R.
Johnson Delmar R.
Rady Bruce A.
Wells Thomas R.
Bell & Howell Company
Samlan A. B.
Stephan Steven L.
Thibault H. G.
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