Patent
1977-01-31
1978-07-04
Adams, Russell E.
354235, G03B 908
Patent
active
040991920
ABSTRACT:
A photographic camera having a magnetic actuating device associated with an electronic control device for initiating a release of one or more of the camera mechanisms from the cocked position thereof. In one embodiment of the invention, the magnetic actuating device comprises a single magnetic winding with a core material having a substantially rectangular hysteresis loop, and an armature of which the movement is controlled by the polarity of the magnetic winding and which is connected to spring-biased means for latching the mechanism in the cocked position. After the core is magnetized by applying a voltage to the magnetic winding for a relatively short period to hold the armature with the latching means in the cocked position against the force of the spring, the magnetic winding is energized by an output of the opposite polarity from the electronic control device causing the armature to move away from the core, whereby the release of the mechanism is initiated.
REFERENCES:
patent: 3533345 (1970-10-01), Starp
patent: 3635141 (1972-01-01), Starp et al.
patent: 3784291 (1974-01-01), Hirata et al.
"Alumina Doped Lithium Bearing Ferrites", IBM Tech. Dis., vol. 11, #7, Dec. 1968, pp. 795-796.
Hysteresis Table from the Handbook of Chemistry & Physics, 30th Edition, p. 1989.
Definition of "Hysteresis Loop", IEEE Standard Dictionary of Electrical & Electronic Terms, p. 267.
Aizawa Hiroshi
Fukui Masahisa
Iura Yukio
Miyakawa Hideaki
Uchidoi Masanori
Adams Russell E.
Canon Kabushiki Kaisha
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