Patent ID: 6738195
Filing Date: 2004-05-18
Classification: G03F,H05K

Abstract:
An optical magnification adjustment system comprising:a first plano-convex or plano-concave lens with an optical power &phgr;2, as defined by the equation below, and a second concave-plano or convex-plano lens with an optical power &phgr;3, as defined by the equation below, both of which are installed in a telecentric position on the side of an object surface or on the side of an image in an optical exposure system, wherein the total system magnification of said optical exposure system may be minutely varied by changing the space between said lenses, &phgr;3=âˆ’&PHgr;(S1+e1)/d0 &phgr;2=âˆ’(&PHgr;âˆ’&phgr;3)/(1âˆ’d0&phgr;3) where,&PHgr;: Total optical power of said optical magnification adjustment system, S1: Distance from the first surface of said first lens to said object surface (i.e., photo mask surface), d0; Center space of said two lenses, that satisfies a magnification &bgr;=1, e1=t1/n1 (t1: Center thickness of said first lens 1, n1: Refraction index of said first lens 1).