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Shading on mirror

IP.com Disclosure Number: IPCOM000013387D
Original Publication Date: 2000-Nov-01
Included in the Prior Art Database: 2003-Jun-18

Publishing Venue

IBM

Abstract

In all optical systems using lens and mirror ,amount of light of marginal ray is less than that of optical axis. Generally, a shading plate is allocated between a lens and a mirror, so that unify the amount of light (Fig1)~The shading plate has a slit and the center gap of that is smaller than the side gap. In this idea of disclosure, the same shape of the slit is printed with black ink on a mirror instead of the slit (Fig2)~Therefore,the mirror with print doubles as the shading plate. 1 2