TITLED DICHROIC POLARIZING BEAMSPLITTER

摘要

The disclosure generally relates to beamsplitters useful in color combiners, and in particular color combiners useful in small size format projectors such as pocket projectors. The disclosed beamsplitters and color combiners include a tilted dichroic reflective polarizer plate having at least two dichroic reflective polarizers tilted at different angles relative to incident light beams, with light collection optics to combine at least two colors of light.

主权项

1. A color combiner, comprising:
a light collection optic having a light input surface and an optical axis; a first and a second light source disposed to inject a first and a second color light into the light input surface, at least one of the first and second light sources displaced from the optical axis; a dichroic reflective polarizer plate comprising:
a first dichroic reflective polarizer capable of reflecting a first polarization direction of the first color light toward a polarization rotating reflector, and transmitting other light; anda second dichroic reflective polarizer capable of reflecting the first polarization direction of the second color light toward the polarization rotating reflector, and transmitting other light; wherein the first dichroic reflective polarizer and the second dichroic reflective polarizer are each tilted such that the first and the second color light reflect from the polarization rotating reflector to form a combined color polarized light beam having an orthogonal second polarization direction, the combined color polarized light beam propagating along a direction perpendicular to the polarization rotating reflector.