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Illuminator and projector

a projector and illumination light technology, applied in the field of illumination light and projector, can solve the problems of short life of the phosphor layer, inability to meet the brightness unevenness of low-efficiency illumination light, and inability to produce illumination light with high efficiency and low brightness unevenness, and achieve low brightness unevenness, high efficiency, and high intensity

Inactive Publication Date: 2016-02-04
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution enables the production of high-intensity illumination with reduced brightness unevenness and increased efficiency, while also improving heat resistance and reducing speckle noise, thus providing a reliable and efficient illuminator capable of projecting high-intensity images with minimal brightness variations.

Problems solved by technology

The illuminator of the related art, which uses the excitation light produced by the plurality of solid-state light sources to produce fluorescence light, has a problem of a short life of the phosphor layer because a large thermal load is applied to the phosphor layer.
Any lens integrator system, however, cannot homogenize the in-plane light intensity distribution of such spot-shaped light in a satisfactory manner, and the configuration of the illuminator of the relate art is therefore problematic in that producing high-intensity illumination light and producing illumination light with high efficiency along with little brightness unevenness cannot be satisfied at the same time.

Method used

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  • Illuminator and projector
  • Illuminator and projector
  • Illuminator and projector

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0063]FIG. 1 is a plan view showing the optical system of a projector 1000 according to a first embodiment.

[0064]FIG. 2 shows a solid-state light source array 20 in the first embodiment viewed from the side where a collimator lens array 30 is present.

[0065]FIGS. 3A to 3C show graphs illustrating intensity characteristics of light emitted from a solid-state light source 24, intensity characteristics of light emitted from a second solid-state light source 224, and intensity characteristics of light emitted from a phosphor in the first embodiment, respectively. FIG. 3A shows a graph illustrating the intensity characteristics of light emitted from the solid-state light source 24. FIG. 3B shows a graph illustrating the intensity characteristics of light emitted from the second solid-state light source 224. FIG. 3C shows a graph illustrating the intensity characteristics of light emitted from a phosphor contained in a phosphor layer 254. The emitted light intensity characteristic used her...

second embodiment

[0127]FIG. 5 is a plan view showing the optical system of an illuminator 101 according to a second embodiment.

[0128]FIG. 6 shows a rotary plate 70 in the second embodiment viewed from the side where a driver 80 is present. In FIG. 6, the symbol labeled with the reference character B is a square each side of which is 0.8 mm in length. The light collecting system 40 illuminates a transmissive diffusing unit 54 with light having a shape of the square such that the area which is illuminated by the light collecting system 40 is included in the square labeled with the reference character B. The same holds in FIGS. 11 to 13 described below, in which a reference character with which a square is labeled represents the color of the light incident on the transmissive diffusing unit.

[0129]The illuminator 101 according to the second embodiment basically has the same configuration as that of the illuminator 100 according to the first embodiment but differs therefrom in that a rotary plate and a d...

third embodiment

[0139]FIG. 7 is a plan view showing the optical system of a projector 1004 according to a third embodiment.

[0140]FIGS. 8A and 8B show graphs illustrating intensity characteristics of light emitted from a solid-state light source 24R and intensity characteristics of light emitted from a phosphor in the third embodiment. FIG. 8A shows a graph illustrating the intensity characteristic of light emitted from the solid-state light source 24R. FIG. 8B shows a graph illustrating the intensity characteristic of light emitted from a phosphor contained in a phosphor layer 256.

[0141]An illuminator 102 according to the third embodiment basically has the same configuration as that of the illuminator 100 according to the first embodiment but differs therefrom in that a light source apparatus for red light, a light source apparatus for green light, and a cross dichroic prism are provided, and accordingly the projector 1004 according to the third embodiment includes no second illuminator and has a d...

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Abstract

An illuminator includes a (solid-state light source array) including a plurality of solid-state light sources, a light collecting system that collects light from the solid-state light source group at a predetermined light collection position, a collimator system disposed on the opposite side of the light collection position to the light collecting system and substantially parallelizing light from the light collecting system, and an integrator system that homogenizes the in-plane light intensity distribution of light from the collimator system. The illuminator further includes a transmissive diffusing unit that is disposed in the vicinity of the light collection position and transmits the light from the light collecting system while diffusing the light from the light collecting system.

Description

[0001]This is a Divisional application of application Ser. No. 13 / 213,643 filed Aug. 19, 2011 which claims priority to JP 2010-190445 filed Aug. 27, 2010. The disclosures of the prior applications are hereby incorporated by reference herein in their entirety.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to an illuminator and a projector.[0004]2. Related Art[0005]There has been a known illuminator including: a solid-state light source group formed of a plurality of solid-state light sources that produce excitation light and outputting the excitation light toward a predetermined light collection position; a phosphor layer that positions in the vicinity of the light collection position and produces fluorescence light when excited with the excitation light from the solid-state light source group; a collimator system that substantially parallelizes the light from the phosphor layer; and a lens integrator system that homogenizes the in-plane light intensity distrib...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B27/48G03B21/20
CPCG03B21/208G03B21/2033G02B5/32G02B27/48G03B21/2013G03B21/204G03B33/06G03B33/12H04N9/3105H04N9/3152H04N9/3164
Inventor AKIYAMA, KOICHI
Owner SEIKO EPSON CORP