Patent ID: 6330113
Filing Date: 2001-12-11
Classification: G02B

Abstract:
A color-separation prism assembly comprising:a first and second prism, said first and second each prism having an entrance surface, an exit surface, and a partially-reflecting surface, wherein said entrance surface of said second prism is separated by an air gap from said partially-reflecting surface of said first prism;a third prism having an entrance surface and an exit surface, wherein said entrance surface of said third prism is adjacent to said partially-reflecting surface of said second prism;said first prism having a cut-out, said cut-out serving as a flare-stop, and providing relief so as to allow said entrance surface of said third prism to slide along said partially reflecting surface of said second prism into a volume defined by said cutout;an optical axis passing through said first, second and third prisms, said optical axis passing through said entrance surface of said first prism, and said exit surfaces of said first, second and third prisms at normal incidence; andsaid partially reflecting surfaces having angles of incidence of less than 30.degree. relative to said optical axis.