Patent ID: 7360901
Filing Date: 2008-04-22
Classification: G03B

Abstract:
1. A cross dichroic mirror, having structure formed of a first dichroic mirror divided into two portions A and B and a second dichroic mirror divided into two portions C and D, and formed of a cross arrangement in which these four portions A, B, C and D bring respective corner sides into close contact, wherein one surface of the portion A of the first dichroic mirror and one surface of the portion B of the first dichroic mirror are in the same plane without gapping and one surface of the portion C of the second dichroic mirror and one surface of the portion D of the second dichroic mirror are in the same plane without gapping and wherein the one surface of the portion A of the first dichroic mirror contacts a side surface of the portion C of the second dichroic mirror, the one surface of the portion C of the second dichroic mirror contacts a side surface of the portion B of the first dichroic mirror, the one surface of the portion B of the first dichroic mirror contacts a side surface of the portion D of the second dichroic mirror, and the one surface of the portion D of the second dichroic mirror contacts a side surface of the portion A of the first dichroic mirror, wherein each of the portions is supported by the two surfaces of the portions located on both sides of each of the portions.