Patent ID: 6778341
Filing Date: 2004-08-17
Classification: G02B

Abstract:
A method for manufacturing a light-selective prism having a substantially regular tetragonal columnar outer shape and including two kinds of selective films formed on an almost X shape interface of the prism, each selective film selecting colored light having wavelengths of a predetermined range, the manufacturing method comprising the steps of:(a) preparing a block formed of a light transmissive member; (b) cutting the block along at least one plane perpendicular to a first direction so as to obtain a plurality of first small blocks whose dimension in the first direction is substantially equal to a predetermined dimension; (c) forming a first selective film on a cut face of at least one of the plurality of the first small blocks; (d) sticking the plurality of the first small blocks together so as to obtain a first processed block in which the first selective film is situated at an interface of adjacent two first small blocks; (e) cutting the first processed block along at least one plane perpendicular to a second direction that is substantially perpendicular to the first direction so as to obtain a plurality of second small blocks whose dimension in the second direction is substantially equal to the predetermined dimension; (f) forming a second selective film on a cut face of at least one of the plurality of the second small blocks; (g) sticking the plurality of the second small blocks together so as to obtain a second processed block in which the second selective film is situated at an interface of adjacent two second small blocks; and (h) obtaining at least one light-selective prism from the second processed block.