Patent ID: 7706642

Claim:
A device for moving an optical beam comprising: a conduit; a conductor joined to said conduit and independently movable in relation to the conduit for at least a portion of a length of said conductor; a electromagnetic field generator positioned in relation to said conductor such that the conductor is movable by a electromagnetic field generated by said electromagnetic magnetic field generator; a shutter affixed to said conduit at a location on said conduit; a beam source positioned such that the beam source may direct a beam at said shutter; a beam sensor positioned such that said beam is directed at a beam sensing portion of said beam sensor, wherein movement of said conduit causes said shutter to modulate an amount of said beam that reaches the beam sensor; and a controller linked to said beam sensor and said conductor such that signals obtained from the beam sensor are sent to the controller and wherein said controller regulates a current flowing through said conductor at least in part in response to said signals from said beam sensor.