Patent ID: 9281733
Filing Date: 2016-03-08
CPC Classification: G03B,H02K

Claim Text:
1. An electromagnetic radiation shutter with blade return on power down comprising: a) a frame with an aperture, which aperture forms a beam path for said electromagnetic radiation; b) a bistable actuator with magnetic drive and retention; c) a rotating magnet in said actuator having a magnetic field operable between two angular positions; d) a soft magnet stator arm positioned so that said magnet is attracted to one of two positions to secure said rotating magnet into one of the two rotational positions; and e) a blade coupled to said rotating magnet in said actuator having a stop detail interacting with a stop detail of said frame to define a first position to cover said frame aperture so as to block said beam path and prevent a beam of electromagnetic radiation from traversing said aperture and a second position to at least one of completely clear said frame aperture so as to completely unblock said beam path and allow said beam to traverse said aperture, and clear said frame aperture sufficiently to completely unblock a central portion of said beam path and allow said beam to traverse said central portion, said stop details providing two angular positions for said rotating magnet to drive said blade to over said frame aperture.