Patent ID: 7513702

Claim:
A shutter assembly comprising: a) a base plate having a shutter opening; b) a drive ring having first and second oppositely-facing surfaces, the drive ring mounted to the base plate for to and fro rotation about an axis extending perpendicular to the base plate; c) at least one shutter blade attached to the first surface of the drive ring movably mounted with respect to the base plate for movement across the shutter opening between a shutter open and a shutter-closed position; d) a cam and cam slot on adjacent surfaces of the shutter blade and drive ring cooperating to move the shutter blade to one or another of the open and closed positions upon the to and fro rotation of the drive ring; e) a post fixed to the second surface of the drive ring and extending into an elongated opening in the base plate; f) a permanent magnet fixed to the post; g) a first fixed electric solenoid carried by the base plate and positioned over the elongated opening and being selectively energized to alternatively attract and repel the permanent magnet along the elongated opening thereby moving the drive ring in to and fro rotation and respectively move the shutter to one and then the other of the shutter open and closed positions; and h) the base plate, drive ring, and shutter blade being of a non-magnetic material.