Magnet and shutter assembly for an electromagnetic shutter

Details Magnet and shutter assembly for an electromagnetic shutter Magnet and shutter assembly for an electromagnetic shutter

1991-07-25

1992-12-22

Wintercorn, Richard A.

Electrical generator or motor structure

Dynamoelectric

Rotary

310191, G03B 908

Patent

active

051737280

ABSTRACT:
A device for connecting a shutter blade to a electromagnetic camera shuttering system that utilizes an armature for producing a first magnetic field, and a stop to control the movement of a shutter blade. The device comprises: a shutter blade that moves across the aperture of the camera and bounces off a stop to control the amount of light that is allowed to enter the camera; and a moveable magnet that produces a second magnetic field, the second magnetic field is coupled to the first magnetic field and a portion of the magnet is sized and shaped to fit the magnet to an orifice in the blade, so that when a portion of the magnet is placed in the orifice the blade will be directly connected to the magnet, and the presence or absence of the first magnetic field will cause the magnet and the blade to move to different orientations. Thus, the blade and the magnet will have a low rotational inertia to increase the speed of the blade and the friction between the blade and the magnet will be controlled to regulate the inertia of the blade and the magnet to prevent the blade from exposing the aperture of the camera when the blade bounces off the stop.

REFERENCES:
patent: 3847476 (1974-11-01), Onda et al.
patent: 4268147 (1981-05-01), Date et al.
patent: 4302090 (1981-11-01), Kiuchi et al.
patent: 4312583 (1982-01-01), Ohniwa et al.
patent: 4417797 (1983-11-01), Senuma
patent: 4847726 (1989-07-01), Mody

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