Patent ID: 6738200
Filing Date: 2004-05-18
Classification: B29C,B29D,B29K,B29L,G02B

Abstract:
A projection lens comprising a resin base having a given curved surface and a reflecting layer formed over the surface of the resin base, characterized in that the average of in-plane birefringent phase differences per unit thickness as measured with incident light from the direction perpendicular to the curved optical functional surface of the resin base is 30 nm/mm or less in a region accounting for at least 60% of the area of the optical functional surface,R1>R2&gE;70% wherein R1 is the average reflectance of light having wavelengths of from 400 to 550 nm on the reflecting surface and R2 is the average reflectance of light having wavelengths of from longer than 550 nm to 700 nm on the reflecting surface.