PRODUCTION OF POLARIZED LIGHT CONVERSION ELEMENT AND PROJECTOR

摘要

PROBLEM TO BE SOLVED: To make efficiently producible a polarized light conversion element by producing a block substrate including plural light transmissive blocks from a composite plate. SOLUTION: Three 1st glass sheets 321a and two 2nd glass sheets 322 are alternately disposed between the upper and middle ones of three 3rd glass sheets 323 and between the middle and lower ones respectively and they are struck together with an optical adhesive 327 in such a way that polarized light separating films 331 and reflecting films 332 are alternately disposed at the interfaces between the glass sheets 323 and 321 and between the sheets 321 and 322 to produce a composite plate 500. This composite plate 500 is nearly parallel cut along 1st sections at a prescribed angle θto the plane of the plate 500 to obtain a block substrate 520. A light incident face 522 and a light emergent face 524 parallel to the 1st sections of the block substrate 520 are ground and polished and the substrate 520 is divided in a part comprising the middle one of the 3rd glass sheets 323 to produce two light transmissive blocks.