Projector

A projector and color separation technology, applied in the field of projectors, can solve problems such as insufficient miniaturization, and achieve the effect of reducing the vertical dimension and reducing the back focal length

CN1677219AInactive Publication Date: 2005-10-05FUJI PHOTO OPTICAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2005-10-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

In the projector 10, a projecting lens 11 and an illuminating optical system 15 are horizontally arranged in a line. A luminous flux emitted from an illuminating lamp 14 enters a cross dichroic prism (XDP) 13 via the illuminating optical system 15, and is separated into luminous fluxes of respective colors. The separate luminous fluxes of the respective colors enter corresponding liquid crystal panels 12R to 12B and re-enter the XDP 13 after the addition of image information to the respective luminous fluxes, and, thereby, they are composed. The XDP 13 can be miniaturized by disposing the intersection lines of dichroic films so as to be perpendicular to the short sides of a rectangular liquid crystal image face 12a. The intersection lines are disposed parallel to a horizontal direction when the projector is installed.
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Description

Technical field

[0001] The present invention relates to an off-axis (off-axis) type projector in which color-separated light beams are incident on a plurality of image display elements, and the light beams of the respective colors that provide image information are combined and projected. Background technique

[0002] The three-panel projector is equipped with a color separation unit that separates the white light emitted by the light source into the three colors of R, G, and B, and three image display elements that modulate the light beams of each color separated into three colors in pixel units. The color combination unit that combines the light beams of the respective colors to which image information is given to the display element. The color separation unit and the color combination unit are known as: a combination of a dichroic mirror and a polarized beam splitter (see Patent Document 1), and a plurality of dichroic mirrors (dichroic prism) for color separation and color co...

Examples

Embodiment Construction

[0019] figure 1 Among them, the projector 10 includes a projection lens 11, three reflective liquid crystal panels 12R, 12G, 12B and XDP 13, an illuminating lamp 14, and an illuminating optical system 15. The illumination optical system 15 is configured as a polarization conversion combination module optical system composed of a first lens array 18, a second lens array 19, a PBS array 20, and a superimposing lens 21. The first and second lens arrays 18 and 19 are arranged in a matrix with microlenses having a shape similar to the shape of the liquid crystal screens of the liquid crystal panels 12R to 12B. The illumination light beam emitted from the illuminating lamp 14 is divided into a plurality of light beams by each micro lens, and each divided light beam is imaged as a tiny light source image on the PBS array 20.

[0020] The PBS 20, as well known, is composed of a prism assembly in which polarized light reflection films and total reflection films are alternately formed, an...