Patent ID: 8531766
Filing Date: 2013-09-10
Classification: B41J,G02B,H04N

Abstract:
1. A polarization-separation device comprising: a beam splitter that includes a beam-separating surface, on which a light beam that contains a first light beam and a second light beam impinges, wherein a polarization direction of the first light beam and a polarization direction of the second light beam are perpendicular to each other, and an incident angle of the first light beam and an incident angle of the second beam vary independently while incident onto the beam-separating surface; a first polarizer arranged in an optical path of transmitted light beams having transmitted through the beam splitter, and allows the first light beam to transmit therethrough; and a second polarizer arranged in an optical path of reflected light beams reflected from the beam splitter, and allows the second light beam to transmit therethrough, wherein, within an effective range of incident angle, at least any one of a value of |Ts−Tp| and a value of |Rs−Rp| obtained when an angle θ the angle θ the angle θ Tp being transmittance of p-polarized component transmitted through the beam-separating surface, Rp being reflectance of the p-polarized component reflected from the beam-separating surface, Ts being transmittance of s-polarized component transmitting through the beam-separating surface, and Rs being reflectance of the s-polarized component reflected from the beam-separating surface.