Patent ID: 7184187
Filing Date: 2007-02-27
Classification: G02B

Abstract:
1. An optical apparatus for compensating for imaging errors associated with a sinusoidal rate of change of an angle of a light beam incident upon an imaging surface of an optical imaging system, where the light beam is produced by a light source, propagates along an optical path from the light source toward a reflective surface of a bidirectional scanning torsion oscillator, and reflects from the reflective surface toward the imaging surface, such that the light beam is scanned in a scan direction at a scan rate from a first edge position on the imaging surface through a central position on the imaging surface to a second edge position on the imaging surface, the optical apparatus comprising a post-scan optical system disposed in the optical path between the reflective surface of the scanning torsion oscillator and the imaging surface of the optical imaging system, the post-scan optical system for causing deflection of the light beam in the scan direction, where the deflection is greater at the first and second edge positions than at the central position, such that the scan rate of the light beam at the first and second edge positions is substantially equivalent to the scan rate at the central position.