Patent ID: 7630057
Filing Date: 2009-12-08
Classification: G02B,G03F

Abstract:
1. A projection optical system for forming a reduced image of a first surface on a second surface, comprising: a first reflecting image forming optical system for forming an intermediate image of the first surface, the first reflecting image forming optical system comprising a first reflecting mirror M a second reflecting image forming optical system for forming an image of the intermediate image on the second surface, the second reflecting image forming optical system comprising a fifth reflecting mirror M the first reflecting mirror M the seventh reflecting mirror M one of the reflecting mirrors from among the second reflecting mirror M wherein when the distance between an optical axis and the center of an arcuate effective image forming region formed on the second surface is Yc, and the width dimension of the effective image forming region along a direction that connects the optical axis and the center of the effective image forming region is Dw, the condition 0.06<Dw/Yc is satisfied.