Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1979-02-22
1981-05-26
Hix, L. T.
Electrical generator or motor structure
Dynamoelectric
Rotary
354234, 354235, 310 13, 310 27, 318135, 335222, 335262, 335263, G03B 900, H02K 3302, H02K 4102, H01F 716
Patent
active
042694930
ABSTRACT:
An electromagnetic shutter control device for controlling opening and closing operation of the shutter of a compact folding camera includes a bobbin having a magnetic winding therearound, a stationary permanent magnet over which the bobbin fits for magnetically actuated movement in a longitudinal direction, and guide elements for constraining movement of the bobbin in the longitudinal direction only. The permanent magnet acts to maintain the bobbin in a normal position at the terminal end of its movement coinciding with the closed position of the shutter. Energization of the magnetic winding actuates the bobbin in order to thereby actuate the shutter to the open position. The bobbin and the permanent magnet are particularly formed with a rectangular configuration so that the electromagnetic control device may be shaped to enhance and facilitate the compactness of a camera with which it is utilized.
REFERENCES:
patent: 3786383 (1974-01-01), Ludwig et al.
patent: 4112450 (1978-09-01), Kondo
patent: 4171897 (1979-10-01), Fujita et al.
Kinoshita Takao
Ogawa Yukio
Suzuki Ryoichi
Uchiyama Takashi
Canon Kabushiki Kaisha
Hix L. T,.
Perkey William B.
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