Patent ID: 6690521
Filing Date: 2004-02-10
Classification: G02B,G03B,Y10S

Abstract:
A method of manufacturing a light-selective prism by joining four columnar prisms together on respective side faces thereof, the method comprising the steps of:(A) providing a block of sheet glass having polished top and bottom faces; (B) forming a first light-selective film on one of the top and bottom faces of the sheet glass; (C) cutting the block of sheet glass with the first light-selective film formed thereon to obtain four columnar prisms, wherein two columnar prisms have faces on which the first light-selective film is formed and two columnar prisms do not have faces on which the first light-selective film is formed; (D) preparing two pairs of prisms by joining respective one of the two columnar prisms having the first light-selective film with respective one of the remaining two columnar prisms without the first light-selective film across the first light-selective film; (E) evenly polishing joint faces of the two pairs of prisms across which the two pairs of prisms are to be joined together; (F) forming a second light-selective film over the even joint face of a selected one of the two pairs of prisms, the second light-selective film being continuous across a joint of the two columnar prisms in the selected pair; and (G) joining the two pairs of prisms together, so as to obtain a prism assembly.