Optics: motion pictures – Removable film strip magazine type
Patent
1980-07-18
1982-01-19
Adams, Russell E.
Optics: motion pictures
Removable film strip magazine type
354289, 352171, G03B 1736
Patent
active
043113788
ABSTRACT:
A film advancement indicator which includes an optical sensor 21 that detects the rotational movement of a disc 18 that rotates only when the film 14 advances. When the film 14 does not advance, an indicator light 29 is activated. A counter 26 is included in the electronic circuit to determine the number of film frames advanced.
REFERENCES:
patent: 4021828 (1977-05-01), Iura et al.
patent: 4114995 (1978-09-01), Stieringer et al.
patent: 4174888 (1979-11-01), Hunn et al.
patent: 4191463 (1980-03-01), Urano et al.
Electronics Engineers' Handbook, Fink & McKenzie, McGraw-Hill, First Edition, pp. 10-13, Sep. 24, 1975.
Dreisbach Francis W.
Freeman E. Thomas
Stump Charles W.
Adams Russell E.
King William H.
Manning John R.
Osborn Howard J.
The United States of America as represented by the Administrator
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