Frame location system

Details Frame location system Frame location system

1974-06-21

1976-02-10

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

235 617R, 235 92V, 353 26A, G03B 2312, G06K 710, G06G 728

Patent

active

039379272

ABSTRACT:
Frame location system for microfilm retrieval system. Frame address of desired frame is stored in first reversible counter having maximum count greater than the maximum possible number of frames in a roll of microfilm. Frame address of frame currently being viewed is stored in second reversible counter of same count capacity. A burst of pulses equal to capacity of both counters causes both to count up. First counter to overflow gates burst pulses into third reversible counter. Second counter to overflow terminates count in third counter. As microfilm moves, optical sensors sense frame identifying "blips" on microfilm thereby reducing count in third counter and slowing film to halt when desired frame is in position at viewing station.

REFERENCES:
patent: 3191006 (1965-06-01), Avakian
patent: 3353161 (1967-11-01), Toscano
patent: 3585372 (1971-06-01), Bell
patent: 3793507 (1974-02-01), Blizard
patent: 3793508 (1974-02-01), Maggi
patent: 3802771 (1974-04-01), Mickelson
patent: 3820884 (1974-06-01), Sone

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