Laser scanning unit, has linear lens to revise time-dependent, sinusoidal angular deviation of microelectromechanically pivotable reflector and to scan laser beam from image plane, where reflector has harmonic movement in pivoting region

摘要

The unit has a collimating lens (11) to output a parallel laser beam upon receiving the laser beam from a semiconductor laser (10). The parallel beam falls on a microelectromechanically pivotable reflector (12) which exhibits a harmonic movement in a pivoting region by a MEMS pivotable mechanism. A linear F-Sintheta lens revises the time-dependent, sinusoidal angular deviation of the reflector and scans the laser beam from an image plane.