A kind of stereo projection apparatus for improving light utilization efficiency

A kind of stereo projection apparatus for improving light utilization efficiency

  • CN 205,787,403 U9
  • Filed: 05/18/2016
  • Issued: 04/26/2017
  • Est. Priority Date: 05/18/2016
  • Status: Active Grant
First Claim
Patent Images

1. a kind of stereo projection apparatus that can improve light utilization efficiency, its feature include:

  • One polarization splitting prism component, is sticked to form by 4 prisms, comprising 1 isosceles right-angle prism, 2 identical acute angle triangular prisms, 1 pentagonal prism;

    Wherein the angle of acute angle triangular prism be 45 degree, 45+ α

    degree, 90- α

    degree;

    The angle of pentagonal prism be respectively obtuse angle 180-2 α

    degree, 90+ α

    degree, 90+ α

    degree, 90 degree, 90 degree, the equal length of two most minor faces of pentagonal prism, the length of two adjacent sides at 180-2 α

    degree obtuse angle are identical;

    Wherein it is the numerical value more than 0 and less than 45;

    When 4 prisms are fitted, with the 180-2 α

    degree rib of 90 degree of ribs of isosceles right-angle prism, the 45+ α

    degree ribs of acute angle triangular prism, pentagonal prism, totally 4 ribs fit together;

    It is in cuboid after 4 prism laminatings, as polarization spectro coated surface, the longest edge of isosceles right-angle prism is exit facet to two waist place surfaces with isosceles right-angle prism;

    The longest edge place plane of pentagonal prism is the plane of incidence;

    Incident beam beam splitting from d-cinema projectors is divided into into transmitting P-type polarisation state light beam, upper half beam S-polarization state the reflected beams, lower half beam S-polarization state the reflected beams;

    Two reflecting mirrors, its reflection plated film are located at front surface, and for adjusting the direction of propagation of the upper half beam the reflected beams, lower half beam the reflected beams, after adjustment, the transmitted light beam, upper half beam the reflected beams, lower half beam the reflected beams have the identical direction of propagation;

    One lens group, at least by a concavees lens and a convex lens group into two lens axis are consistent, and the adjustment of spacing scalable, for adjusting the magnitude range of the transmitted light beam, after adjustment, the image of the transmitted light beam, upper half beam the reflected beams, lower half beam the reflected beams in screen is in the same size;

    At least one plane of polarization rotary components, for the plane of polarization of the transmitted light beam of the polarization splitting prism component, upper half beam the reflected beams, lower half beam the reflected beams is adjusted to same level;

    Three linear polarizers, are absorption-type linear polarizer, before light polarization modulator, for filtering through its light beam so as to be changed into line polarized light completely through light beam;

    Three light polarization modulators, by after adjustment and the transmitted light beam with consistent plane of polarization, upper half beam the reflected beams, lower half beam the reflected beams are modulated to left circularly polarized light and right-circularly polarized light according to frame sequential;

    Drive circuit, for from the synchronizing signal acquired in d-cinema projectors, and produces drive voltage signal according to synchronizing signal and puts on light polarization modulator.

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