Retrieval system

Details Retrieval system Retrieval system

1992-04-17

1993-12-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250570, 353 26A, G06K 710

Patent

active

052723526

ABSTRACT:
A film retrieval system comprises a light source for illuminating a film having marks applied thereon, a photo-detector for detecting light intensity transmitted from the illuminated film, a device for determining a reference in accordance with the light intensity detected by the photo-detector, a discriminator for determining the presence or absence of the mark by comparing the reference determined by the reference device and an output of the photo-detector and, a setting device for setting a detection point of the transmitted light intensity by the photo-detector at any point spaced from a leading edge of the film.

REFERENCES:
patent: 3972624 (1976-08-01), Klein et al.
patent: 3999846 (1976-12-01), Sone et al.
patent: 4043652 (1977-08-01), Mickelson
patent: 4600841 (1986-07-01), Tokuno et al.
patent: 4665318 (1987-05-01), Toda et al.
patent: 4687321 (1987-08-01), Itoh
patent: 5137347 (1992-08-01), Imai
patent: 5146247 (1992-09-01), Kashiwagi

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