Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1989-03-30
1991-06-18
Stephan, Steven L.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335281, 354440, H01F 708, H01F 300, G03B 708
Patent
active
050252399
ABSTRACT:
An electromagnetic actuator suitable for use in combination with the mechanisms of cameras and the like. The electromagnetic actuator has a single electromagnet, and first and second armatures disposed opposite to the opposite attracting surfaces of the electromagnet, respectively. The first armature actuates a first operating lever for operating the shutter release mechanism of a camera, and the second armature actuates a second operating lever for operating the diaphragm of the camera. The first armature is separated from the attracting surface and the second armature is in contact with the attracting surface while the electromagnet is not energized. When the electromagnet is energized, the first armature is attracted to the attracting surface to actuate the first operating lever for releasing the shutter. When the electromagnet is de-energized, the second armature is separated from the attracting surface to allow the second operating lever which has been detained by the second armature to be turned for controlling the diaphragm. A control circuit decreases the current energizing the electromagnet after the first and second armatures have been attracted to the corresponding attracting surfaces to save power.
REFERENCES:
patent: 2735968 (1956-02-01), Bogue et al.
patent: 3343112 (1967-09-01), Schulze
patent: 3453572 (1969-07-01), Masterson
patent: 3477049 (1969-11-01), Kreidler
patent: 4132474 (1979-01-01), Ueda et al.
patent: 4133608 (1979-01-01), Tanaka
patent: 4160983 (1979-07-01), Inagaki et al.
patent: 4682133 (1987-07-01), Kern
patent: 4833435 (1989-05-01), Ohara
Hawai Yasuo
Ishimura Toshihiko
Kajita Hideo
Murashima Nobuharu
Okuno Akira
Minolta Camera Kabushiki Kaisha
Stephan Steven L.
Vyas Nilay H.
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