POLARIZED BEAM SPLITTER, HOLOGRAM LASER UNIT, OPTICAL PICKUP DEVICE AND MANUFACTURING METHOD OF POLARIZED BEAM SPLITTER

摘要

PROBLEM TO BE SOLVED: To provide a polarized beam splitter constituted so that the deterioration caused by environmental changes such as changes in temperature/humidity in a lapse of time after being manufactured is suppressed.;SOLUTION: Optical transparent substrates 2 and 6 are equipped with a level difference 8 on the periphery so as to form a projection with reference to a diffraction grating 7 side, and adhesive layers 3A and 3C coming into contact with the optical transparent substrates 2 and 6 are charged also in the level difference part 8, then, chipping of the optical transparent substrates 2 and 6 after a manufacturing process by dicing, etc., is generated in a position separated from an optical anisotropic film 5 in a laminating direction, then, such an influence that the splitter is peeled off by the chipping is reduced, and also, the adhesive layers 3A and 3C are continuously formed on a part of the side face of the polarized beam splitter 1, then the material peeling of the optical anisotropic film 5 is suppressed, and the reliability of the splitter is drastically improved as compared with the conventional polarized beam splitter.;COPYRIGHT: (C)2005,JPO&NCIPI