Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-04-16
1992-02-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250570, 353 26A, G06K 7015
Patent
active
050862316
ABSTRACT:
A microfilm retrieval system includes blip marks provided at transversely opposite side portions of selected image frames of an elongated microfilm, a device for detecting the blip marks, counters for counting the number of blip marks in accordance with kinds of blip marks, respectively, a device for determining a specific combination of the kinds of blip marks when two or more kinds of blip marks are provided to selected the image frames, and a controller for controlling the counters such that the blip marks are counted with a unit of count and a reset value corresponding to the specific combination of marks determined by the determining device. The unit of count and the reset value at the time of counting blip marks can be set to desired numerical values, and counting is effected by making a page number or the like provided on a photographed object coincide with a count value, thereby facilitating retrieval.
REFERENCES:
patent: 3937927 (1976-02-01), Weigert
patent: 4514641 (1985-04-01), Tanaka et al.
patent: 4607950 (1986-08-01), Ishii et al.
patent: 4687321 (1987-08-01), Itoh
Takamori Tetsuya
Watanabe Izumi
Yamaguchi Takashi
Yokota Kenji
Allen S.
Fuji Photo Film Co. , Ltd.
Nelms David C.
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