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Projector

A projector and chromatic light technology, applied in the field of projectors, can solve problems such as the reduction of the brightness of optical images

Inactive Publication Date: 2007-04-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, the brightness of the optical image when the color light is synthesized by the color synthesis optical device is reduced.

Method used

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Experimental program
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no. 1 Embodiment approach

[0061] Next, a first embodiment of the present invention will be described with reference to the drawings.

[0062] 〔Structure of the projector〕

[0063] The projector 1 is used to modulate the light beam emitted from the light source according to the image information to form an optical image, and enlarge and project it on the screen. As shown in FIG. 1 , this projector 1 includes an exterior case 2 , an optical device 3 , and a projection lens 4 as a projection optical device.

[0064] Also, although the illustration is omitted in FIG. 1 , in the outer casing 2, in a space other than the optical device 3 and the projection lens 4, a cooling assembly is arranged to cool the inside of the projector 1; The power supply unit is used to supply power to the various components in the projector 1; and the control board is used to drive and control the optical device 3 and the above-mentioned cooling unit.

[0065] The exterior case 2 is made of synthetic resin or the like, and is ...

no. 2 Embodiment approach

[0102] Next, a second embodiment of the present invention will be described with reference to the drawings.

[0103] In the following description, the same structures and components as those of the above-mentioned first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted or simplified.

[0104] In the projector 1A of the present embodiment, as shown in FIG. 6 , the concave lens 50 described in the above-mentioned first embodiment is omitted from the optical device 3A, and the reflecting mirror 33 described in the above-mentioned first embodiment is changed to A convex mirror 33' as a chromatic aberration correcting optical element. Its structure is the same as that of the above-mentioned first embodiment except that the concave lens 50 is not provided and the reflecting mirror 33 is changed to a convex mirror 33'.

[0105] In this way, since the reflective mirror 33 described in the above-mentioned first embodiment is change...

no. 3 Embodiment approach

[0109] Next, a third embodiment of the present invention will be described with reference to the drawings.

[0110] In the following description, the same structures and components as those of the above-mentioned first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted or simplified.

[0111] In the projector 1B according to this embodiment, as shown in FIG. 7 , the concave lens 50 described in the above-mentioned first embodiment is omitted from the optical device 3B, and the field lens described in the above-mentioned first embodiment is formed to The radii of curvature of the lens surfaces of 41G and 41B' are different. Its structure is the same as that of the above-mentioned first embodiment except that the concave lens 50 is not provided and the shape of the field lens 41B' is different.

[0112] The lens surface LB of the field lens 41B' and the lens surface LG of the field lens 41G, which are chromatic aberration cor...

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Abstract

A color separating optical device (30) constituting an optical device (3) separates a light flux projected from an illuminating optical device (20) into three color beams of red, green and blue. The optical device (3) is arranged in a blue color beam optical path, which has the same geometrical length as that of the green color beam, among optical paths of the three color beams reaching each of liquid crystal panels (42R, 42G, 42B) from the illuminating optical device (20). The optical device changes an image location of the blue color beam and is provided with a concave lens (50) for correcting chromatic aberration of the green color beam and the blue color beam.

Description

technical field [0001] The present invention relates to a projector. Background technique [0002] In the past, the following projectors have been known. The projector has: an illumination optical device for forming an image of a light beam emitted from a light source at a predetermined position; a color separation optical device for converting the light beam emitted from the illumination optical device Separation into three color lights of red, green, and blue; three light modulation devices, used to modulate the separated colors of light according to image information; color synthesis optical device, used to synthesize the modulated colors of light to form an optical image; And a projection optical device, which is used to enlarge the optical image formed by projection. [0003] As an illumination optical device, in order to make the intensity distribution of the light beam emitted from a light source uniform, the following structure (integrator illumination system) is ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00G02B27/18G02F1/13G02F1/1335
CPCG03B21/00G03B21/005
Inventor 桥爪俊明秋山光一
Owner SEIKO EPSON CORP
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