Patent ID: 6667834
Filing Date: 2003-12-23
Classification: G02B,G02F,H04N

Abstract:
A polarization luminaire, comprising:a light source emitting light having random polarization directions; a polarization beam splitting device that comprises: a flat columnar prism having a first surface and a second surface opposing the first surface; a triangular prism, an inclined surface of the triangular prism being joined to the first surface of the flat columnar prism; a polarization beam splitting film interposed between the flat columnar prism and the triangular prism and splitting the light emitted from the light source into two kinds of polarized lights, polarization direction of the two kinds of the polarized lights being perpendicular to each other; and a reflection film formed on the second surface of the flat columnar prism, the reflection film reflecting one of the two kinds of the polarized lights being transmitted by the polarization beam splitting film; a lens plate having a plurality of lenses, wherein a plurality of pairs of adjacent secondary light source images is formed by the lens plate and the polarization beam splitting device, one of a pair of adjacent secondary light source images being formed by the one of the two kinds of polarized lights and another of the pair of adjacent secondary light source images being formed by another of the two kinds of polarized lights; a polarization conversion element that converts the polarization directions of the plurality of pairs of secondary light source images to be the same; and wherein the triangular prism includes a structure element having six transparent plates and a liquid filled inside of the structure element.