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Projection optical system and projection image display

一种投影光学系统、光学系统的技术，应用在投影光学系统和投影图像显示装置领域，能够解决不能同时减小深度等问题，达到低失真、高分辨率、稳定光学性能的效果

Inactive Publication Date: 2008-05-28
SONY GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as shown in FIG. 38, when the projection television system projects an image using a known method (wherein the optical axis "a" passes through the center of the image display element b and the center of the screen "c"), it cannot be reduced at the same time. Depth "d" and size "e" of the part below the screen

Method used

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  • Projection optical system and projection image display

Examples

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no. 1 example

[0192] Fig. 1 illustrates an optical path according to a first embodiment. The image display element P functions as a modulation unit. Light emitted from a light source (not shown) is modulated by the image display element P according to a video signal. In this way, a primary imaging plane is formed. A reflective or transmissive dot-matrix liquid crystal display panel or a digital micromirror device (DMD) may be used for the image display element P. Referring to FIG. Reference numeral PP denotes a polarizing beam splitter (PBS), a color combining prism combining video signals of red, green and blue, or a total internal reflection (TIR) ​​prism.

[0193] FIG. 2 illustrates a portion of the projection optical system shown in FIG. 1 in detail. The first optical system L1 includes a first group with negative refractive power, a second group with positive refractive power, a diaphragm, and a third group with positive refractive power in the following order from the secondary ima...

no. 2 example

[0216] Fig. 12 illustrates an optical path according to the second embodiment. The image display element P functions as a modulation unit. Light emitted from a light source (not shown) is modulated by the image display element P according to a video signal. In this way, a primary imaging plane is formed. For the image display element P, a reflective or transmissive dot-matrix liquid crystal display panel or a digital micromirror device (DMD) may be used. Reference numeral PP denotes a polarizing beam splitter (PBS), a color combining prism combining video signals of red, green and blue, or a total internal reflection (TIR) ​​prism.

[0217] FIG. 13 illustrates a portion of the projection optical system shown in FIG. 12 in detail. The first optical system L1 includes a first group with negative refractive power, a second group with positive refractive power, a diaphragm, and a third group with positive refractive power in the following order from the secondary imaging plane ...

no. 3 example

[0238] Fig. 20 illustrates an optical path according to the third embodiment. The image display element P functions as a modulation unit. Light emitted from a light source (not shown) is modulated by the image display element P according to a video signal. In this way, a primary imaging plane is formed. For the image display element P, a reflective or transmissive dot-matrix liquid crystal display panel or a digital micromirror device (DMD) may be used. Reference numeral PP denotes a polarizing beam splitter (PBS), a color combining prism combining video signals of red, green and blue, or a total internal reflection (TIR) ​​prism.

[0239] FIG. 21 illustrates a portion of the projection optical system shown in FIG. 20 in detail. The first optical system L1 includes a first group with negative refractive power, a second group with positive refractive power, a diaphragm, and a third group with positive refractive power in the following order from the secondary imaging plane s...

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Abstract

A projection optical system for magnifying an image on a primary imaging plane onto a secondary imaging plane, the projection optical system comprising: a first optical system for forming an intermediate image; and a second optical system including an arrangement a concave reflective surface between the intermediate image and the secondary imaging plane. The first optical system includes first and second groups having negative and positive refractive powers, respectively; an aperture; and a third group having positive refractive power, arranged in order from the intermediate image. Surfaces of the first and second optical systems have rotational symmetry with respect to the optical axis. A ray traveling from the center of the primary imaging plane to the center of the secondary imaging plane intersects the optical axis, is reflected from the reflective surface, intersects the optical axis again, and reaches the secondary imaging plane. The following conditional expressions are satisfied: 0.5<φ1 / φ2<3, 1<AST / ASS<5, |AST| / L12<1, and -3<K_rel.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP 2006-299808 filed in the Japan Patent Office on Nov. 6, 2006, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a projection optical system and a projection image display device, and in particular to a method for reducing the depth of the projection optical system and the projection image display device, and reducing the above and below the screen while maintaining high resolution and low distortion of the image. The height of the upper and lower parts of the technology. Background technique [0004] Recently, demands for projection television systems are rapidly increasing. Projection television systems share features common to flat panel televisions such as liquid crystal displays (LCDs) and plasma display panels (PDPs). Compared with LCDs and PDPs, project...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/08G02B3/00G03B21/00
CPCG02B17/08G03B21/28G02B17/0852H04N5/7408G02B27/0025
Inventor 西川纯
Owner SONY GRP CORP
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