Patent ID: 7773278

Claim:
A reflective optical scanning system having minimized aberration, comprising: a first scanning mirror, said first scanning mirror receiving an optical beam to process a horizontal scanning (HS); a first spherical mirror said first spherical mirror being located downstream of an optical path of said first scanning mirror, said first spherical mirror having a distance to said first scanning mirror equal to a focal distance of said first spherical mirror, said first spherical mirror converging and reflecting said optical beam scattered by said first scanning mirror; a second spherical mirror, said second spherical mirror being located downstream of an optical path of said first spherical mirror, said second spherical mirror having a distance to said first spherical mirror equal to a sum of said focal distance of said first spherical mirror and a focal distance of said second spherical mirror, said second spherical mirror reflecting said optical beam reflected by said first spherical mirror; a second scanning mirror, said second scanning mirror being located downstream of an optical path of said second spherical mirror, said second scanning mirror having a distance to said second spherical mirror equal to a focal distance of said second spherical mirror, said second scanning mirror reflecting said optical beam converged by said second spherical mirror to process a vertical scanning (VS); a third spherical mirror, said third spherical mirror being located downstream of an optical path of said second scanning mirror, said third spherical mirror having a distance to said second scanning mirror equal to a focal distance of said third spherical mirror, said third spherical mirror converging and reflecting said optical beam scattered by said second scanning mirror; and a fourth spherical mirror, said fourth spherical mirror being located downstream of an optical path of said third spherical mirror, said fourth spherical mirror having a distance to said third spherical mirror equal to a sum of said focal distance of said third spherical mirror and a focal distance of said fourth spherical mirror, said fourth spherical mirror reflecting said optical beam reflected by said third spherical mirror, wherein a set of said first spherical mirror and said second spherical mirror together with a set of said third spherical mirror and said fourth spherical mirror compensate for astigmatism; and wherein a set of said first spherical mirror and said third spherical mirror together with a set of said second spherical mirror and said fourth spherical mirror compensate for coma.