Patent ID: 6714330
Filing Date: 2004-03-30
Classification: G02B

Abstract:
A scanning optical system for imaging an object, comprising:an object side lens unit for receiving light having a plurality of color components from an object; a mirror for performing a main scan by deflecting the light transmitted through the object side lens unit, the mirror having a reflecting surface including a rotational axis on the reflecting surface; and an image side lens unit for forming an image on an image sensing surface, said image sensing surface for receiving an image having a plurality of color components, using both the extra-axial light and axial light in a subscan direction deflected by the mirror; wherein the following condition is satisfied: 0.1fpâˆ’&Sgr;&ngr;fm)/Lf|<15 where &Sgr;&ngr;fp represents the sum of the Abbe numbers of the positive optical power lenses within the object side lens unit, &Sgr;&ngr;fm represents the sum of the Abbe numbers of the negative optical power lenses within the object side lens unit, and Lf represents the number of lenses in the object side lens unit.