Patent ID: 6970275

Claim:
A torsion oscillator scanner comprising: a light beam source producing a light beam, a plate member disposed in the path of the light beam having a non-rectangular shape selected from the group of elliptical, oval, racetrack, or circular, the plate member having an upper surface, a lower surface, and a rotational axis and opposite edges, a frame disposed in a spaced apart relation to the lower surface of the plate member, a mount for holding the plate number adjacent the frame, said mount including a pair of torsion springs extending in opposite directions from the opposite edges of the plate member and being rigidly attached to the frame, the torsion springs being positioned coaxially along the axis of rotation of the plate member, a reflective surface located on a surface of the plate member for reflecting the light beam, at least one magnet disposed on the plate, at least one coil located on the frame and configured for inducing electromagnetic force on the at least one magnet when alternating current is applied to the at least one coil to thereby oscillate the reflective surface to a rotational angle of oscillation at an oscillation frequency to scan the light beam through a scanning pattern in at least first and second directions at the oscillation frequency, and wherein the reflective surface comprises a mirror having an optical power.