Electromagnetic camera shutter with a conductive strip on the blade and a permanent magnet aperture

摘要

An improved electromagnetic camera shutter incorporating an electrically conductive shutter blade having a hole there through that is connected in series to a pair of electrically conductive springs to urge the shutter blade into a first or a second position from a compressed position between the first and the second positions. A permanent magnet having a hole there through is positioned in proximity to the shutter blade such that the shutter covers the hole in the permanent magnet when the shutter is in the first or the second position. A control means, for applying a current through the springs and the shutter blade in a first direction, generates an electromagnetic field between the shutter blade and the permanent magnet to move the shutter blade from the first position to the second position and for applying a current through the springs and the shutter blade in a second direction so as to move the shutter blade from the second position to the first position such that the hole in the shutter is positioned over the hole in the permanent magnet during transitions of the shutter between positions.