DICHROIC FILTER

摘要

The dichronic filter provides a large screen even at a short light travel length. The dechronic filter comprises a substrate having a certain refractive index and a standard stack composed of two layers having different refractive indice. The two layers having the thickness ratio of 3.5:1 to 5.5:1 is alternatively stacked to form a stack, and the highest or the lowest layer of the stack has a higher or lower refractive ratio compared with the other layers in the stack.