Electromagnetic mechanism for providing a hard stop for moving b

Details Electromagnetic mechanism for providing a hard stop for moving b Electromagnetic mechanism for providing a hard stop for moving b

1996-05-30

1997-04-08

Mathews, A. A.

Photography

Camera detail

Shutter

396508, 396257, G03B 902, G03B 908

Patent

active

056192967

ABSTRACT:
An improved hard stop for use with an aperture mechanism is comprised of at least one blade moveable along a path between a closed position and at least one open position, and at least one hard stop that 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 a hard stop piston. The improved hard stop is comprised of a magnetic piston, an electromagnet that is positioned proximate the magnetic piston for causing the magnetic piston to move to the first position when current is applied to the electromagnet in a first direction and for causing the magnetic piston to move to the second position when current is applied to the electromagnet in a second direction. A first ferromagnet is positioned at the first position to maintain the magnetic piston at the first position when current ceases to be applied to the electromagnet in the first direction. A second ferromagnetic is positioned at the second position to maintain the magnetic piston at the second position when current ceases to be applied to the electromagnet in the second direction.

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: 5337110 (1994-08-01), Dowe
patent: 5432576 (1995-07-01), SanGregory et al.

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