Optics: motion pictures – Removable film strip magazine type
Patent
1976-10-19
1978-08-01
Adams, Russell E.
Optics: motion pictures
Removable film strip magazine type
354 41, 354 42, 354 44, 354 60A, 352141, G03B 708
Patent
active
041046560
ABSTRACT:
Electronic means for controlling the aperture of an electromagnetically operated diaphragm of a photographic camera, especially a single lens mirror reflex camera. The diaphragm aperture is set by a pot-shaped electromagnet. The coil of the electromagnet is supplied with current by an electronic circuit which responds to light falling on a photoelectric converter placed behind the diaphragm, which compares the value of this response to a nominal value resulting from a shutter speed setting and a film speed or sensivity setting, and transmits current in a rapid series of pulses to the coil of the magnet which operates the diaphragm. The pulsing nature of the current applied to the electromagnet tends to cause a slight vibration in the mechanical parts of the diaphragm mechanism, and this vibration helps to overcome the static friction of the moving parts of the diaphragm mechanism, facilitating the setting of the diaphragm to the exact value desired.
REFERENCES:
patent: 3427941 (1969-02-01), Metzger
patent: 3605001 (1971-09-01), Miyakawa
patent: 3611894 (1971-10-01), Minneste, Jr.
patent: 3709137 (1973-01-01), Starp
patent: 3813680 (1974-05-01), Wagensonner
patent: 3972607 (1976-08-01), Reider
Adams Russell E.
Rollei-Werke Franke & Heidecke
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