Patent ID: 6844951
Filing Date: 2005-01-18
Classification: G02B

Abstract:
1. A torsion oscillator scanner comprising: a light source for producing a light beam; a plate member 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, 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, a reflective surface located on a surface of the plate member for reflecting a 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 a receiving surface disposed in the path of the light beam in the scanning pattern for interacting with the light beam to produce information, and control logic for controlling the oscillation of the reflective surface to oscillate the reflective surface at or near a resonant frequency of the plate member.