Electromagnetic actuator for providing a hard stop for moving bl

Details Electromagnetic actuator for providing a hard stop for moving bl Electromagnetic actuator for providing a hard stop for moving bl

1996-11-18

1997-11-11

Mathews, A. A.

Photography

Camera detail

Diaphragm shutter unit

396463, 396508, 396510, G03B 902, G03B 908

Patent

active

056874170

ABSTRACT:
An hard stop for use with an aperture mechanism includes at least one blade moveable along a path between a closed position and at least one open position. At least one hard stop piston is moveable between a first position, out of the blade path, and a second position, in the blade path, to position the blade in the open position when an edge of the blade contacts the hard stop piston. The hard stop includes a magnetic piston, an electromagnet coil proximate to the magnetic piston, and a ferromagnetic ring arranged such that when current is applied in one direction through the coil it causes the magnetic piston to move to the first position in a first direction and held in such position by the attraction of the magnetic piston to the ferromagnetic ring and causes the magnetic piston to move to the second position when current is applied in an opposite direction to the coil and the magnetic piston is held in such position by the attraction of the magnetic piston to the ferromagnetic ring.

REFERENCES:
patent: 4112450 (1978-09-01), Kondo
patent: 4505568 (1985-03-01), Asano et al.
patent: 4760420 (1988-07-01), Lam
patent: 5159382 (1992-10-01), Lee et al.
patent: 5325142 (1994-06-01), Depatie et al.
patent: 5337110 (1994-08-01), Dowe
patent: 5432576 (1995-07-01), San Gregory et al.

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