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Compact projection apparatus for generating high-quality images
| Details |
Inventors: Inoue, Shingo; Hattori, Tetsuo; Esaki, Sampei;
Assignee: Nikon Corporation (Tokyo, JP)
Primary Examiner: Burgess; Glenton B.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby, Cushman IP Group of Pillsbury Madison & Sutro LLP
The projection apparatus of the present invention includes a light source; a three-color separation means such as a cross dichroic prism or a cross dichroic mirror; three first polarization beam splitters; three spatial light modulators; three write image formation devices; and a projection optical system. The three-color separation means and the three first polarization beam splitters all lie in a single plane, and the three first polarization beam splitters are so arranged that a reflected light beam is emitted from each of the three first polarization beam splitters in the same direction. |
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DETAILED DESCRIPTION The objective of the present invention is to propose a projection apparatus which is compact and yet furnishes an image of high picture quality.
In order to attain this objective, the present invention proposes a projection apparatus, comprising: a three color separation means which separates source light into a red light beam, a green light beam, and a blue light beam; three first polarization beam splitters, each of which separates a corresponding one of the three red, green, and blue light beams from the three color separation means into two linearly polarized light beams, one of which is emitted as a first transmitted light beam and the other of which is emitted as a first reflected light beam; three spatial light modulation means, each of which modulates the reflected light beam emitted by each of the three first polarization beam splitters to a modulated light beam; three write image formation means, each of which forms a write image upon a corresponding one of the three spatial light modulation means; and a projection means which projects upon a screen transmitted light beams of the modulated light beams, wherein the modulated light beams are incident upon the three first polarization beam splitters from the three spatial light modulation means, respectively.
The three color separation means and the three first polarization beam splitters all lie in a single plane, and the three first polarization beam splitters are so arranged that the first reflected light beam is emitted from each of the three first polarization beam splitters in the same direction, perpendicular to the plane.
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LCD 
