Polarizing beam splitter, projection optical system,...

Details Polarizing beam splitter, projection optical system,... Polarizing beam splitter, projection optical system,...

2008-08-15

2011-11-29

Ko, Tony (Department: 2878)

Optics: image projectors

Polarizer or interference filter

C359S485030, C359S489110

Reexamination Certificate

active

08066381

ABSTRACT:
A polarizing beam splitter includes: first and second prisms each having first and second end surfaces serving as an input surface or an output surface of light and an opposed surface as side surfaces of a pillar-like member; and at least two parallel flat layers disposed in parallel between the opposed surfaces of the first and second prisms. Here, one of the least two parallel flat layers is a first parallel flat layer polarization-separating the input beam. When it is assumed that the refractive index of a base material of the first and second prisms is Np, the resultant refractive index of the parallel flat layers other than the other parallel flat layer of the at least two parallel flat layers is Na, and the refractive index of the other parallel flat layer of the at least two parallel flat layers is Nb, (Na−Np)×(Nb−Np)<0 is satisfied.

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