Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1999-07-16
2000-12-05
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Linear
310112, 310 15, 310 27, 396463, 396467, 396468, 396471, H02K 4100, H02K 3300, H02K 720, G03B 908
Patent
active
061571008
ABSTRACT:
An electromagnetic drive for a focal-plane shutter of a camera having two light-excluding shutter curtains, each of the two shutter curtains being having its own electric drive motor, which is a linear motor constructed from permanent magnets and electromagnetic coils. The linear motor has at least two mutually aligned permanent magnets. The opposite pole faces of the magnets have the same polarity. A soft-magnetic disk is disposed between the permanent magnets. A soft-iron casing encloses the magnets and the soft-magnetic disk with an annular gap therebetween. A coil former is displaceably mounted in the annular gap such that it can exert an operating stroke between two stops. The coil former has a drive element for transferring the axial displacement of the coil former to the assigned shutter curtain.
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Abstract of JP 57 017938, Oba Takehiko, Jan. 29, 1982, Electrcmagnetic Focal Plane Shutter, Patent Abstracts of Japan, vol. 006, No. 082 (P-116)(1982).
Dinh Le Dang
Ramirez Nestor
Rollei Fototechnic GmbH
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