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Lighting optical system and projection display device

An illumination optical system and optical resonance technology, applied in optics, using projection device, image reproducer, projection device, etc., can solve the problems of complex structure of display device, difficulty in cheap manufacturing of display device, and decrease in brightness of projected image

Inactive Publication Date: 2004-08-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the case of using a lens array, since the cross-sectional size of the two lens arrays is large and there must be a certain distance between them, there is a problem of increasing the size of the device as a result.
[0015] In addition, in order to convert polarized light, when using a cylindrical optical element, an aperture (aperture) must be provided on the end face of the element on the light input side, but in this case, there is a problem of loss when the light passes through
When a long conversion prism is provided after the lens array for polarized light conversion, there is a problem that the display device is difficult to manufacture inexpensively due to the complicated structure of the device.
In addition, in the case of using a polarization splitting prism and a phase plate for polarization conversion, there is a problem that the structure of the display device becomes complicated and the weight becomes heavy.
[0016] In addition, in order to perform full-color display with a single light valve, there is a problem that the light utilization efficiency is lowered when a color wheel is used, and there is a problem that the structure of the display device becomes complicated and the size becomes larger when a rotating prism is used.
In addition, in the case of using a BMF (Band Modulation Filter: Band Modulation Filter) switch for full-color display with one light valve, there is a problem that it is difficult to prolong the life of the display device.
[0017] In addition, in order to perform full-color display with one light valve, in the case of using a color wheel with spirally arranged color regions, in order to recover reflected light on the color region, a cylindrical optical element with an opening provided on the input end surface is used, so There is a problem of light loss
In addition, there is a problem that the brightness of the projected image will drop significantly even if the light source moves only slightly
[0018] In addition, in traditional illumination optical systems, reflective optical elements such as reflective optical switches, dichroic mirrors, reflective polarized light separation elements, and reflective light valves are arranged perpendicular to the optical axis, and the reflected light moves along the receding direction Goes toward the lamp, so there is a problem that part of the reflected light returning to the lamp causes the lamp electrode temperature to rise and the life to deteriorate

Method used

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  • Lighting optical system and projection display device
  • Lighting optical system and projection display device
  • Lighting optical system and projection display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] figure 1 It is a configuration diagram showing the configuration of the illumination optical system 51 according to Embodiment 1 of the present invention.

[0042] exist figure 1 In the illumination optical system 51 of , the lamp portion reflector 2 as a light collecting device is disposed near the lamp 1 as a light source. On the optical path of the light reflected by the lamp reflector 2, the second reflector 3, the first reflector 4, the columnar optical element 5, the 1 / 4 wavelength plate 6 as a phase plate, the reflector Type polarized light separator 7, color wheel 8, optical relay (relay) device 9, light valve 10 and projection lens 11.

[0043] Arrow A represents the direction of travel of light L1 reflected by lamp reflector 2, arrow B represents the direction of travel of light L2F inside cylindrical optical element 5, and arrow C represents the direction in which light L2F travels in the direction opposite to light L2F inside cylindrical optical element ...

Embodiment 2

[0085] Figure 6 is a diagram showing the configuration of the illumination optical system 52 according to Embodiment 2 of the present invention.

[0086] The difference between the illumination optical system 52 of the present embodiment 2 and the illumination optical system 51 of the above-mentioned embodiment 1 is that the columnar optical element 5 ( figure 1 ), and the 1 / 4 wavelength plate 6 and the reflective polarized light separation element 7 are replaced by the 1 / 4 wavelength plate 62 and the reflective polarized light separation element 72. Therefore, the common parts of the illumination optical system 52 of the second embodiment and the illumination optical system 51 of the first embodiment are given the same reference numerals, or the drawings and explanations are omitted, and the different features are mainly explained.

[0087] Such as Figure 6 As shown, by setting the 1 / 4 wavelength plate 62 and the reflective polarized light separation element 72 as the ob...

Embodiment 3

[0093] Figure 7 It is a configuration diagram showing the configuration of an illumination optical system 53 according to Embodiment 3 of the present invention.

[0094] exist Figure 7 In the illumination optical system 53, the lamp part reflector 2 is arranged near the lamp 1 as a light source. On the optical path of the light reflected by the reflector 2 of the lamp part, a lens 15, a polarized light converter 16, a second reflector 32, and a reflective polarized light splitter as a reflective polarized light splitter are sequentially arranged from the place close to the lamp 1. Device 17 , first mirror 42 , color wheel 82 , reflective liquid crystal light valve 102 , polarizer 18 and projection lens 112 .

[0095] First, the overall operation of the above-mentioned structure will be described below.

[0096] Arrow A indicates the advancing direction of the light L1 reflected by the lamp unit reflector 2 . The lens 15 inputs the light L1 and then outputs it to the pola...

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Abstract

Provided is a structure of an illumination optical system capable of attaining a function of an optical integrator with a small and simple structure and having high light utilization efficiency and high performance, and to provide a projection display apparatus. As for the illumination optical system, an optical cavity (C1) is constituted of a first reflection mirror (4) for partly reflecting light traveling in a forward direction after being emitted from a lamp and a second reflection mirror (3) for partly reflecting the light traveling in the backward direction after being reflected by the first reflection mirror. A columnar optical element (5) as a body to be illuminated is arranged in an aperture (14) formed in the central part of the first reflection mirror (4) in the optical cavity, and a window (13) for transmitting the light traveling in the forward direction is formed in the central part of the second reflection mirror.

Description

technical field [0001] The present invention relates to an illumination optical system for guiding light emitted from a light source to a light valve for forming an image, and to a projection display device using the illumination optical system. Background technique [0002] In a projection display device, the illumination optical system having the function of concentrating input light and transmitting it converts the light emitted by the light source into light with uniform intensity in the cross section, and then uses it to illuminate the light valve. An ultra-high pressure mercury lamp (lamp) is used as the light source, and the scattered light emitted by the lamp is converted into parallel light or converging light by a concave mirror installed near the lamp, and input to the illumination optical system. If the light emitted by the lamp is concentrated, it will have a light intensity distribution that is as bright as the central part and approximately rotationally symmet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B19/00G02B27/18G02B27/28G02F1/13G02F1/13357G03B21/00G03B21/14G03B21/28H04N9/31
CPCH04N9/3197H04N9/3114G03B21/28H04N9/3152
Inventor 日比武利冈森伸二
Owner MITSUBISHI ELECTRIC CORP
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