Self-timer

Details Self-timer Self-timer

1975-07-11

1978-03-14

Griffin, Donald

Optics: motion pictures

Removable film strip magazine type

352175, 354238, G03B 1500, G03B 100, G03B 964

Patent

active

040793982

ABSTRACT:
A self-timer for cinecameras wherein an electric delay circuit is used for detecting a length of time from the release to the commencement of a photographing process which takes place with an electric power having been actually supplied to a film feeding motor. The amount of the rotation made by the film feeding motor from the start of the rotation of the motor is either mechanically or electrically detected. When the detected amount of rotation reaches a preset value corresponding to a number of frames of the film required for self-timer photographing, the motor is stopped to terminate the photographing operation, so that the photographing operation with the self-timer can be accomplished exactly for a preset number of frames.

REFERENCES:
patent: 2667808 (1954-02-01), Hart
patent: 3280713 (1966-10-01), Goldberg
patent: 3602584 (1971-08-01), Anderl et al.
patent: 3640201 (1972-02-01), Kimura
patent: 3641902 (1972-02-01), Kikuchi et al.
patent: 3667367 (1972-06-01), Miyagawa
patent: 3683774 (1972-08-01), Lange
patent: 3692393 (1972-09-01), Anderl
patent: 3715959 (1973-02-01), Harvey
Leica Photography Magazine 354-212, vol. 19, No. 1, 1966 cover (back page).
Leica Photography Magazine 354-212, vol. 18, No. 3, 1965, pp. 10-11, New Motor Drive for Leica M2.

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