JP2002090885A - Illuminator, projection-type display device using the illuminator and method for controlling illuminating light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illuminator, capable of adjusting the irradiation position of illuminating light to an optimum position and preventing the reduction of beams passing an optical modulation means, a projection-type display device using the illuminator and a method for controlling illuminating light. SOLUTION: The illuminator is provided with an adjusting part 130 for respectively moving the optical axes of a 1st negative lens 109, a 2nd negative lens 110 and a 2nd relay lens 113, arranged as transmitted light elements to prescribed directions from the optical axes of optical systems 124, 125, 136 for respective chromatic light components, concretely directions parallel and vertical to the optical axes, in each of arrangement positions of the lenses 109, 110, 113 and independently adjusting the illuminating light irradiation positions and ranges of 1st to 3rd translucent type liquid crystal panels 115 to 117, corresponding to respective chromatic light components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device and a projection type display device such as a liquid crystal projector device using the same.
And a method for adjusting illumination light.

[0002]

2. Description of the Related Art A liquid crystal projector is a projection type display device using a spatial light modulator (hereinafter, referred to as a liquid crystal panel) using a liquid crystal material. In the liquid crystal projector device, since the liquid crystal itself does not emit light, the liquid crystal panel is illuminated with illumination light incident on the liquid crystal panel in combination with the light source. And
An image signal is applied to the liquid crystal panel, and an image formed on the liquid crystal panel is projected on a screen by a projection lens. Note that a discharge lamp or the like that emits white light is generally used as the light source. In this case, red (R), green (G),
Liquid crystal panels corresponding to the three primary colors of blue (B) are used.

FIG. 3 is a configuration diagram showing an example of a conventional three-panel type liquid crystal projector. As shown in FIG. 3, the three-panel type liquid crystal projector 10 has a discharge lamp 11a.
And a light source 11, U constituted by a reflector 11b
V-IR cut filter 12, first multi-lens array 13, second multi-lens array 14, condensing lens 15 composed of a plano-convex lens, first dichroic mirror 1
6. Second dichroic mirror 17, first reflection mirror 18, first relay lens 19, second reflection mirror 2
0, a second relay lens (reversing relay lens) 21,
A third reflection mirror 22, a first transmission type liquid crystal panel 23,
Second transmissive liquid crystal panel 24, third transmissive liquid crystal panel 25, first field lens 26, second field lens 27, third field lens 28, cross dichroic prism 29, projection lens 30, and screen 31.

In this projector device 10, a light source 11
The illumination light radiated from the discharge lamp 11a is reflected and condensed by the reflecting surface of the parabolic reflector 11b, is converted into a substantially parallel light flux, and is emitted from the opening. In the illumination light emitted from the light source 11, unnecessary light invisible in an infrared region and an ultraviolet region is blocked by a UV-IR cut filter 12, and only an effective light beam for forming an image is provided by a first multi-lens array. 13 is incident.

[0005] In the first multi-lens array 13, the illumination light passing through the filter 12 is divided into a plurality of parts, and their images are laid out near the light incident surface of the second multi-lens array 14. Then, the second multi-lens array 14
Here, a condensing lens (a plano-convex lens) having a positive refractive power so that the divided light source images by the first multi-lens array 13 can be incident as illumination light for the first to third transmissive liquid crystal panels 23 to 25. ) 15.

In the plano-convex lens 15, the incident light is refracted in the direction in which the incident light is converged, and is emitted to the first dichroic mirror 16. In the first dichroic mirror 16, the first
Is transmitted as red light RL, for example,
Light in the second wavelength band and light in the third wavelength band are reflected, for example, as green light GL and blue light BL.
Red light RL transmitted through the first dichroic mirror 16
Is reflected by the first reflection mirror 18 and enters the first transmission type liquid crystal panel 23 via the first field lens 26.

The green light GL and the blue light BL reflected by the first dichroic mirror 16 are incident on a second dichroic mirror 17. The second dichroic mirror 17 reflects, for example, green light GL and transmits blue light BL. Then, the green light GL reflected by the second dichroic mirror 17 is incident on the second transmission type liquid crystal panel 24 via the second field lens 27. Further, the blue light BL transmitted through the second dichroic mirror 17 passes through the first relay lens 19,
The light is reflected by the second reflection mirror 20, further passes through the second relay lens 21, and is reflected by the third reflection mirror 22. Then, the blue light BL reflected by the third reflection mirror 22 enters the third transmission type liquid crystal panel 25 via the third field lens 28.

First to third transmission type liquid crystal panels 23 to 25
In, spatial light modulation is performed on the basis of an applied video signal, and the light is incident on the cross dichroic prism 29 from different directions. In the cross dichroic prism 29, the red light is reflected by the reflection surface 29a, the blue light is reflected by the reflection surface 29b toward the projection lens 30, and the green light is transmitted through the reflection surfaces 29a and 29b. The modulated light emitted from the third transmission liquid crystal panels 23 to 25 is synthesized. As a result, the images formed by the first to third transmissive liquid crystal panels 23 to 25 are displayed on the screen 3.
1 and a desired color image is displayed.

[0009]

By the way, the lighting device employed in the above-described projector device is a light source 1
If the position where the light emitted from 1 is condensed on the liquid crystal panels 23 to 25 is not at the correct position, a so-called lack of illumination occurs in the projected image and the quality of the image is significantly impaired. The position needs to be adjusted.

In the conventional lighting apparatus, the light emitted from the light source 11 is shifted due to a manufacturing error of an optical element constituting an illumination system or an error in an arrangement position of the optical element. Was adjusted as follows. That is, the condensing lens 15 arranged before the light is split by the dichroic mirror 16 can be moved in parallel on a plane perpendicular to the optical axis. In the configuration of FIG.
The positions of incidence on the liquid crystal panels 23 and 24 for red and green are adjusted, and the illumination position on the liquid crystal panel 25 for the remaining one color (blue) is set with the second relay lens 27 of the relay optical system on the optical axis. On the other hand, it is adjusted by a mechanism that can move in parallel on a vertical plane.

However, in the above-described conventional method, the positions of the lights condensed on the two liquid crystal panels 23 and 24 having the same optical path length are adjusted by adjusting the position of one lens 15, so that the positions are adjusted to be mutually optimal. Difficult to do.

In order to solve this problem, mirrors having the same optical path length are adjusted to mutually optimal positions by tilting at least one of the reflection mirrors 18 disposed between the two liquid crystal panels and the condenser lens. Some have realized this.

However, in this method, since the distance between the reflection mirror and the liquid crystal panel, which is inclined to adjust the position of condensing light on the liquid crystal panel, is short, if the reflection mirror is inclined, the angle of light rays incident on the liquid crystal panel is greatly inclined. There is a disadvantage that the luminous flux passing through the liquid crystal panel is reduced.

The present invention has been made in view of such circumstances, and has as its object to adjust the irradiation position of illumination light to an optimum position, and to reduce a light beam passing through the light modulation means. It is an object of the present invention to provide a lighting device capable of preventing such a problem, a projection display device using the same, and a method for adjusting illumination light.

[0015]

In order to achieve the above object, an illumination device according to the present invention comprises: a light source for emitting illumination light; a spectral means for separating the illumination light emitted from the light source into a plurality of color lights; A plurality of light modulating units that receive the respective color lights separated by the spectroscopic unit as illumination light and emit modulated light; a light combining unit that combines the plurality of modulated lights emitted from the respective light modulating units; A plurality of optical systems for color light that form an optical path for guiding each of the color lights dispersed in the corresponding light modulating unit; A plurality of transmission optical elements capable of adjusting the irradiation area, and each of the transmission optical elements can be moved in a predetermined direction with respect to the optical axis of the optical system for each color light, and the irradiation position of each color light on the corresponding light modulation means can be adjusted. Multiple adjustment means for independent adjustment and A.

Further, the illumination device of the present invention includes a light source for emitting illumination light, a spectral unit for spectrally dividing the illumination light emitted from the light source into a plurality of color lights, and an illumination unit for illuminating each color light separated by the spectral unit. A plurality of light modulating means for receiving modulated light and emitting the modulated light; a light synthesizing means for synthesizing the plurality of modulated lights emitted from each of the light modulating means; and a light modulation corresponding to each color light separated by the spectroscopic means. A plurality of optical systems for color light forming an optical path for guiding light to the means, and a plurality of transmission optical elements arranged on the optical path of the optical system for each color light and capable of adjusting the irradiation area of each color light to the corresponding light modulating means. And a plurality of adjustments for moving each of the transmission optical elements in a predetermined direction with respect to the optical axis of each color light optical system, and independently adjusting the irradiation position and range of each color light to the corresponding light modulating means. Means.

Further, the projection type display device of the present invention comprises a light source for emitting illumination light, spectral means for spectrally dividing the illumination light emitted from the light source into a plurality of color lights, and each color light spectrally separated by the spectral means. A plurality of light modulators that receive modulated light as illumination light, and a plurality of light modulators that combine the plurality of modulated lights emitted from the respective light modulators. A plurality of optical systems for color light forming an optical path for guiding light to the light modulating unit; and a plurality of transmission systems arranged on the optical path of the optical system for each color light and capable of adjusting the irradiation area of the corresponding color light to the corresponding light modulating unit. An optical element, and a plurality of adjustments for moving each of the transmission optical elements in a predetermined direction with respect to the optical axis of the optical system for each color light, and for independently adjusting the irradiation position of each color light on the corresponding light modulating means. Means and the combined light of the photosynthesis means. And a projection optical system for projecting on the lean.

Further, the projection type display device of the present invention comprises a light source for emitting illumination light, a spectral means for spectrally dividing the illumination light emitted from the light source into a plurality of color lights, and each color light spectrally separated by the spectral means. A plurality of light modulators that receive modulated light as illumination light, and a plurality of light modulators that combine the plurality of modulated lights emitted from the respective light modulators. A plurality of optical systems for color light forming an optical path for guiding light to the light modulating unit; and a plurality of transmission systems arranged on the optical path of the optical system for each color light and capable of adjusting the irradiation area of the corresponding color light to the corresponding light modulating unit. An optical element and a plurality of optical elements each of which is capable of moving each of the transmission optical elements in a predetermined direction with respect to the optical axis of each color light optical system, and independently adjusting the irradiation position and range of each color light to the corresponding light modulating means. Adjustment means;
A projection optical system for projecting the combined light of the light combining means onto a screen.

The present invention also provides a light source that emits illumination light, a spectral unit that splits the illumination light emitted from the light source into a plurality of color lights, and receives each color light that has been split by the spectral unit as illumination light. A plurality of light modulating means for emitting modulated light, a plurality of color light optical systems forming an optical path for guiding each of the color lights separated by the spectroscopic means to the corresponding light modulating means, and the respective color light optical systems A plurality of transmission optical elements disposed in each of the optical paths of the illumination device, the illumination light adjustment method, the illumination position of each color light to the corresponding light modulation means as illumination light, the transmission optical element Each of them is independently moved and adjusted in a predetermined direction with respect to the optical axis of each color light optical system.

The present invention also provides a light source that emits illumination light, a spectral unit that splits the illumination light emitted from the light source into a plurality of color lights, and receives each color light split by the spectral unit as illumination light. A plurality of light modulating means for emitting modulated light, a plurality of color light optical systems forming an optical path for guiding each of the color lights separated by the spectroscopic means to the corresponding light modulating means, and the respective color light optical systems A plurality of transmission optical elements disposed in each of the optical paths of the illumination device, wherein the illumination position and range as illumination light to the corresponding light modulation means of each color light, the transmission optical The adjustment is performed by independently moving each of the elements in a predetermined direction with respect to the optical axis of the optical system for each color light.

According to the present invention, the shift of the position where the illuminating light emitted from the light source is condensed on the light modulating means such as the liquid crystal panel due to a manufacturing error can be corrected by adjusting the optical paths of the optical systems for the respective color lights. Is performed by independently moving each of the plurality of transmission optical elements disposed in a predetermined direction with respect to the optical axis of each color light optical system. Thereby, the correction of the illumination device is optimized for each color light, and the angle change of the light beam incident on the light modulation means such as the liquid crystal panel is suppressed. Therefore, the decrease in the amount of light projected by the projection optical system is suppressed, and the lack of illumination is eliminated.

Further, by moving a transmission optical element such as a negative lens in the optical axis direction, the size of light condensed on light modulating means such as a liquid crystal panel can be changed arbitrarily. By reducing the size of the light that is condensed to the extent that does not cause the lack of illumination, a brighter projection device can be realized.

In the case where the illumination loss occurs at the reference position, the illumination loss can be avoided by moving the transmission optical element away from the light modulating means.

[0024]

FIG. 1 is a block diagram showing an embodiment of a three-panel type liquid crystal projector employing a lighting device according to the present invention.

This three-panel liquid crystal projector 100
As shown in FIG. 1, a light source 101, a UV-IR cut filter 102, a first multi-lens array 103, a second multi-lens array 104, a condenser lens 105 composed of a plano-convex lens, and a first Dichroic mirror 106, a second dichroic mirror 107 as a spectral unit, a first reflection mirror 108, a first negative lens 109 as a transmission optical element, a second negative lens 110 as a transmission optical element, a transmission optical element A first relay lens 111, a second reflection mirror 112, a second relay lens (reversing relay lens) 113 as a transmission optical element, a third reflection mirror 114, and a first transmission as a light modulation unit. Liquid crystal panel 115, a second transmissive liquid crystal panel 116 as light modulating means, and a third transmissive liquid crystal panel as light modulating means. Le 117, a first field lens 118, second field lens 119, a third field lenses 120, cross dichroic prism 121 as a light combining means, and a projection lens 122, and a screen 123.

Then, the first dichroic mirror 10
6, the first reflecting mirror 108 and the first field lens 118 constitute, for example, a first color light optical system 124 for guiding the split red light RL to the first transmission type liquid crystal panel 115. I have. Also, the first dichroic mirror 106 and the second dichroic mirror 10
7 and the second field lens 119, for example, the green light GL split into the second transmission type liquid crystal panel 1.
A second color light optical system 125 for guiding the light to the second light source 16 is formed. Also, the first dichroic mirror 106 and the second
Dichroic mirror 107, second reflection mirror 11
The third, third reflecting mirror 114 and the third field lens 120 constitute a third color light optical system 126 for guiding, for example, the blue light BL to be split to the third transmission type liquid crystal panel 117. I have.

Then, the projector device 100
Although not shown in FIG. 1, the first negative lens 109, the second negative lens 110, and the second relay lens 113 provided as transmissive optical elements , The second negative lens 110 and the optical axis of the second relay lens 113 in a predetermined direction with respect to the optical axes of the optical systems 124, 125, and 136 for the respective color lights, specifically, parallel to the optical axes. To adjust the irradiation position and range (light-condensing position and range) of each color light as illumination light of the corresponding first to third transmission-type liquid crystal panels 115 to 117 independently of each other. Adjustment section is provided.

Hereinafter, the configuration of the adjustment unit and the function of each unit will be described step by step.

FIG. 2 is a configuration diagram showing an example of the adjusting section 130 as adjusting means according to the present embodiment. here,
The adjustment section for the first negative lens 109 will be described as an example.

As shown in FIG. 2, the adjusting unit 130 for moving the negative lens 109 along the optical axis OA has an L shape, an optical path for the negative lens 109 is formed on the upright plate 1031a, and a negative light is formed on the bottom plate 1031b. The first adjustment plate 1302 and the second adjustment plate 1303 for moving the lens 109 on a plane perpendicular to the optical axis are fixed, and elongated holes 1031d and 1031c parallel to the optical axis OA are formed. Main body 1031 and main body 1031 for fixing negative lens 109
Two or more shafts 103 along the optical axis to be fitted with the holes of
Another optical element including two or more shafts 1034 along the optical axis, which is fitted to a not-shown member fixed to the lighting device to which 4 is fixed, or a hole of the main body 1031 to which the negative lens 109 is fixed. Are configured by combining the fixed lighting devices.

The first adjusting plate 1032 has a negative lens 109 fixed at the center and a second adjusting plate 1033 around the negative lens 109.
The adjustment rod 1033a formed on the plane is a plane perpendicular to the optical axis,
And an elongated hole 1032 formed so as to be guided in the vertical direction.
a is formed. The second adjustment plate 1033 is
An optical path of the negative lens 109 is formed in the center, and the adjustment rod 10 formed on the upright plate 1031a of the main body 1031 around the center.
An elongated hole 1033b is formed so as to guide 31e in a plane perpendicular to the optical axis and in a horizontal direction.

In the adjustment unit 130, the negative lens 109
The first adjustment plate 1032 to which is fixed is guided in a plane perpendicular to the optical axis and in a vertical direction, and the first and second adjustment plates 1032 and 1033 are guided in a plane perpendicular to the optical axis and horizontally. By guiding in the direction, the optical axis of the negative lens 109 is moved along the optical path axis of the color light optical system.

The other adjusting parts for the second negative lens 110 and the second relay lens 113 have the same configuration.

The light source 101 is, for example, a discharge lamp 101
a and the reflector 101b, and emits illumination light of white light.

The UV-IR cut filter 102 blocks unnecessary light, which is invisible in an infrared region and an ultraviolet region, from the illumination light emitted from the light source 101, and only the effective light for forming an image is subjected to the first light. The light is emitted to the multi-lens array 103.

The first multi-lens array 103 is provided with a plurality of lenses, and is provided with a light source 10 through a filter 102.
1 is divided into a plurality of images, these divided images are condensed, and the light spot of each divided image is laid out at a predetermined position.

The second multi-lens array 104 includes the first
A plurality of lenses corresponding to a plurality of light spots condensed by the multi-lens array 103 are arranged, and the divided images by the first multi-lens array 103 are superimposed and combined by each lens and emitted to the condensing lens 105.

The condenser lens 105 is composed of a plano-convex lens and has a positive refracting power, that is, refracts the incident light in a converging direction so that the first dichroic mirror 1
It emits at 06.

The first dichroic mirror 106 transmits light of the first wavelength band among the light emitted from the condenser lens 105 as, for example, red light RL, and transmits light of the second wavelength band and light of the third wavelength band. Light is reflected as, for example, green light GL and blue light BL. That is, the first dichroic mirror 106 splits the light emitted from the condenser lens 105 into red light RL, green light GL, and blue light BL.

The second dichroic mirror 107 reflects the green light GL in the second wavelength band split by the dichroic mirror 106 and transmits the blue light BL in the third wavelength band. That is, the second dichroic mirror 10
7 splits the light into green light GL and blue light BL.

The first reflecting mirror 108 reflects the split red light in a direction different from the incident direction by 90 degrees, and
To the first transmission type liquid crystal panel 115 through the field lens 118 of FIG.

The first negative lens 109 is composed of, for example, a plano-concave lens, and the reflecting unit 108 of the first dichroic mirror 106 for the red light RL is adjusted by the adjusting unit 130.
The optical axis is substantially aligned with the optical path of the light emitted to the light source. Then, the first negative lens 109 refracts the red light RL in a direction in which the light refracted in the positive direction (converging direction) by the condenser lens 105 diverges, and emits the light to the reflection mirror 108.
Accordingly, the red light R emitted from the first negative lens 109
The position where L forms the illumination area corresponding to the first transmissive liquid crystal panel 23 moves to the condenser lens 105 side as compared with the case where the first negative lens 109 is not disposed.

The second negative lens 110 is constituted by, for example, a plano-concave lens, and the adjusting unit 130 substantially places the green light GL and the blue light BL of the first dichroic mirror 106 in the light path to the second dichroic mirror 107. The optical axes are aligned. Then, the second negative lens 110 converts the green light GL and the blue light BL red light RL into
The light refracted in the positive direction (the direction of convergence) by the condenser lens 105 is refracted in the direction of divergence and emitted to the second dichroic mirror 107. Thereby, the position where the green light GL emitted from the second negative lens 110 forms an illumination area corresponding to the second transmission type liquid crystal panel 24 is more concentrated than when the second negative lens 110 is not disposed. Optical lens 1
It will move to the 05 side.

The first relay lens 111 is disposed so that the optical axis of the blue light BL of the first dichroic mirror 107 is transmitted to the second reflecting mirror 112 so as to be substantially coincident with the optical axis of the second dichroic mirror 107. Receiving the blue light BL as the illumination light transmitted therethrough, the optical path length from the light source 101 to the first transmission type liquid crystal panel 115 and the second transmission type liquid crystal panel 116, and the light source 101 to the third transmission type liquid crystal panel 115. Based on the difference from the optical path length to the liquid crystal panel 117, an image of the illumination light is further generated and emitted to the second reflection mirror 112.

The second reflection mirror 112 reflects the blue light BL emitted from the first relay lens 111 in a direction at 90 degrees with respect to the incident direction, and emits the blue light BL to the second relay lens 113.

The second relay lens 113 is
0 indicates that the optical path of the blue light BL of the second reflecting mirror 112 to the third reflecting mirror 114 is substantially aligned with the optical axis, and 1 the image of the illumination light formed by the first relay lens 113 is inverted. Then, the light is emitted to the third reflection mirror 114.

The first transmissive liquid crystal panel 23 performs spatial light modulation on the irradiated red light based on the applied video signal, and emits the modulated light to the cross dichroic prism 121.

The second transmissive liquid crystal panel 24 performs spatial light modulation on the illuminated green light based on the applied video signal, and emits the modulated light to the cross dichroic prism 121.

The third transmissive liquid crystal panel 25 performs spatial light modulation on the irradiated blue light based on the applied video signal, and emits the modulated light to the cross dichroic prism 121.

The cross dichroic prism 121 is
The red modulated light from the first transmissive liquid crystal panel 23 is reflected by the reflective surface 121a, and the blue modulated light from the third transmissive liquid crystal panel 25 is reflected by the reflective surface 121b toward the projection lens 122. The green modulated light from the second transmission type liquid crystal panel 24 is transmitted through the reflection surfaces 121a and 121b,
The modulated light emitted from the first to third transmission-type liquid crystal panels 115 to 117 is combined.

The projection lens 122 forms an image on the screen 31 of the combined light by the cross dichroic prism 121, that is, the image light formed by the first to third transmissive liquid crystal panels 115 to 117.

In the illuminating device of the projector device 100 configured as described above, the illuminating light emitted from the light source 101 causes the manufacturing error of the optical element constituting the illuminating system,
First and second generated by an error in the arrangement position of the optical element
Adjustment of the position where light is condensed on the transmissive liquid crystal panels 115 and 116 is performed by adjusting the negative lenses 109 and 110 by the adjustment unit 130.
This is performed by moving the arrangement optical path parallel to a plane perpendicular to the optical axis. The shift of the position of condensing light on the third transmissive liquid crystal panel 117 of a so-called relay system is corrected by moving the second relay lens 113 by the adjusting unit 130 in parallel with a plane perpendicular to the optical axis of the arrangement optical path. It is done by letting it. Thereby, adjustment can be performed for each color light. Also,
The first negative lens 109 is connected to the first transmission type liquid crystal panel 11.
Since the distance from 5 is larger than that of the first reflection mirror 108, the light is transmitted through the liquid crystal panel due to a change in the light beam angle, which is a problem in the conventional technique of adjusting the liquid crystal panel for each color light. It is possible to reduce the decrease in the luminous flux amount.

The mechanism for moving the lens in a plane perpendicular to the optical axis can be implemented in various modes, such as combining a sheet metal, combining a part formed of resin, and combining a sheet metal part and a resin part. Is possible.

Further, by moving a negative lens (transmission optical element) having a negative power along the optical axis, the illumination range can be adjusted. For example, the first negative lens 1
09 or the second transmission type liquid crystal panel 115 or the second transmission type liquid crystal panel 1
By adjusting the distance from the light source 16, the illumination light emitted from the light source 101 at the position of the liquid crystal panel is focused on a large area. When the illumination light emitted from the light source 101 is condensed on the liquid crystal panel due to a manufacturing error of an optical element constituting an illumination system or an error in an arrangement position of the optical element, the size of the light condensed becomes smaller than the area of the liquid crystal panel. ,
Chipping of the illumination range occurs, which significantly reduces the quality of the projected image. In order to solve this, the adjusting unit 103 arranges the negative lenses 109 and 110 at positions where the negative lenses 109 and 110 increase along the optical axis.

Next, the operation of the projector device 100 adjusted as described above will be described.

In the projector device 100, the light source 1
The illumination light radiated from the discharge lamp 101a is reflected and condensed by the reflecting surface of the parabolic reflector 101b, converged into a substantially parallel light flux, and emitted from the opening. The illuminating light emitted from the light source 101 is composed of unnecessary light that is invisible in an infrared region and an ultraviolet region.
The first multi-lens array 10 is cut off by the IR cut filter 102 and only the effective light rays for forming an image are removed.
3 is incident.

In the first multi-lens array 103, the illumination light passing through the filter 102 is divided into a plurality of parts, and their images are laid out near the light incident surface of the second multi-lens array 104. Then, in the second multi-lens array 104, the divided light source images by the first multi-lens array 103 are divided into the first to third transmissive liquid crystal panels 115 to 115.
The light is incident on a condenser lens (plano-convex lens) 105 having a positive refractive power so as to be able to enter as illumination light 117.

In the condenser lens 105, the incident light is refracted in the direction in which the incident light is converged, and the first dichroic mirror 106
Is emitted. In the first dichroic mirror 106, light in the first wavelength band is transmitted as, for example, red light RL, and light in the second wavelength band and light in the third wavelength band are, for example, green light GL and blue light BL. Is reflected as The red light RL transmitted through the first dichroic mirror 106 is converted into a first negative lens 10 having a negative refractive power.
The light is refracted in the direction of divergence at 9, is further reflected by the first reflection mirror 108, and enters the first transmission type liquid crystal panel 115 via the first field lens 118.

The green light GL and the blue light BL reflected by the first dichroic mirror 106 are refracted by a second negative lens 110 having a negative refractive power in a diverging direction. Incident.
The second dichroic mirror 107 reflects, for example, green light GL and transmits blue light BL. And
The green light GL reflected by the second dichroic mirror 107 is incident on the second transmissive liquid crystal panel 116 via the second field lens 119.

The second dichroic mirror 107
After passing through the first relay lens 111, the blue light BL transmitted through is reflected by the second reflection mirror 112, further passed through the second relay lens 113, and reflected by the third reflection mirror 114. You. Then, the third reflection mirror 11
The blue light BL reflected by 4 enters the third transmissive liquid crystal panel 117 via the third field lens 120.

First to third transmissive liquid crystal panels 115 to 1
In 17, spatial light modulation is performed on the basis of the applied video signal, and the light enters the cross dichroic prism 121 from different directions. In the cross dichroic prism 121, the red modulation light is reflected by the reflection surface 121a, the blue modulation light is reflected by the reflection surface 121b toward the projection lens 122, and the green modulation light is reflected by the reflection surface 12a.
The transmitted modulated light from the first to third transmissive liquid crystal panels 115 to 117 is synthesized by transmitting through the first and second transmission liquid crystal panels 1a and 121b. Thereby, the first to third transmission type liquid crystal panels 115
To 117 are enlarged and projected on the screen 123 to display a desired color image.

As described above, according to the present embodiment, the first negative lens 10 provided as a transmission optical element
9, the first negative lens 109, the second negative lens 110, and the second relay lens 113
Second negative lens 110 and second relay lens 11
Each of the three optical axes is connected to the optical systems 124 and 12 for each color light.
The first to third transmissive liquid crystal panels 115 to 117 corresponding to each color light are moved in a predetermined direction with respect to the optical axes of 5,136, specifically, in a direction parallel to and perpendicular to the optical axis.
Since the adjustment unit 130 for independently adjusting the irradiation position and range (light collection position and range) as the illumination light is provided, the following effects are obtained. In other words, it is possible to optimize the correction of the shift of the position where the light emitted from the light source 101 is condensed on the liquid crystal panel due to a manufacturing error for each color light, and to reduce the angle change of the light incident on the liquid crystal panel. Hold down,
A reduction in the amount of light to be projected can be suppressed, and a bright projection device with no missing light can be realized.

Further, by moving the negative lens in the direction of the optical axis, the size of the light condensed on the liquid crystal panel can be arbitrarily changed, and the light condensed on the liquid crystal panel can be reduced to the extent that the lack of illumination does not occur. By doing so, a brighter projection display device can be realized.

In the case where an illumination defect occurs at the reference position, the illumination defect can be avoided by moving a negative lens or the like as a transmission optical element away from the liquid crystal panel.

[0065]

According to the present invention, it is possible to optimize the correction of the shift of the position where the light emitted from the light source is condensed on the light modulating means due to a manufacturing error for each color light. It is possible to suppress a change in the angle of the light beam incident on the modulating means and to suppress a decrease in the amount of light to be projected. As a result, it is possible to realize a bright projection display device with no missing light.

Further, by moving a transmission optical element such as a negative lens in the direction of the optical axis, the size of light condensed on the light modulating means can be changed arbitrarily. By making it as small as possible without causing chipping,
A brighter projection device can be realized.

If illumination loss occurs at the reference position, the illumination loss can be avoided by moving a transmission optical element such as a negative lens away from the light modulating means.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a three-panel liquid crystal projector device employing a lighting device according to the present invention.

FIG. 2 is a configuration diagram illustrating an example of an adjustment unit as an adjustment unit according to the present invention.

FIG. 3 is a configuration diagram of a three-panel liquid crystal projector device employing a conventional illumination device.

[Explanation of symbols]

100: three-plate type liquid crystal projector device, 101: light source,
101a: discharge lamp, 101b: reflector, 102
... UV-IR cut filter, 103 ... first multi-lens array, 104 ... second multi-lens array, 10
5: a condensing lens composed of a plano-convex lens, 106: a first dichroic mirror as spectral means, 107 ... a second dichroic mirror as spectral means, 108 ... first
109, a first negative lens as a transmission optical element, 110, a second negative lens as a transmission optical element, 111, a first relay lens as a transmission optical element, 1112, a second reflection mirror .. 113, a second relay lens (reversing relay lens) as a transmission optical element;
114: third reflection mirror; 115: first transmission type liquid crystal panel as light modulation means; 116: second transmission type liquid crystal panel as light modulation means; 117: third transmission type liquid crystal means Liquid crystal panel, 118: first field lens, 119: second field lens, 120: third field lens, 121: cross dichroic prism as light combining means, 122: projection lens, 1
23 ... screen, 130 ... adjustment unit, 1031 ... body,
1032: first adjustment plate, 1033: second adjustment plate.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 360 G02F 1/1335 530 F-term (Reference) 2H088 EA14 EA15 HA13 HA21 HA24 HA28 MA20 2H091 FA05Z FA08X FA14Z FA26Z FA29Z FA41Z FD06 FD12 LA12 MA07 5G435 AA01 AA04 BB17 CC12 DD05 GG01 GG03 GG04 GG08 LL15

Claims (6)

[Claims] A light source that emits illumination light; a spectral unit that spectrally separates the illumination light emitted from the light source into a plurality of color lights; and a modulated light that receives each of the color lights separated by the spectral unit as illumination light. A plurality of light modulating means for emitting light, a light synthesizing means for synthesizing a plurality of modulated lights emitted from the respective light modulating means, and an optical path for guiding each color light separated by the spectroscopic means to a corresponding light modulating means. A plurality of optical systems for color light to be formed; a plurality of transmission optical elements arranged in an optical path of the optical system for each color light, and capable of adjusting an irradiation area of each color light to a corresponding light modulation unit; And a plurality of adjusting means for independently adjusting the irradiation position of each color light to the corresponding light modulating means, wherein the adjusting means is movable in a predetermined direction with respect to the optical axis of each color light optical system. 2. A light source that emits illumination light, a spectral unit that separates the illumination light emitted from the light source into a plurality of color lights, and a modulated light that receives each of the color lights separated by the spectral unit as illumination light. A plurality of light modulating means for emitting light, a light synthesizing means for synthesizing a plurality of modulated lights emitted from the respective light modulating means, and an optical path for guiding each color light separated by the spectroscopic means to a corresponding light modulating means. A plurality of optical systems for color light to be formed; a plurality of transmission optical elements arranged in an optical path of the optical system for each color light, and capable of adjusting an irradiation area of each color light to a corresponding light modulation unit; And a plurality of adjusting means capable of moving in a predetermined direction with respect to the optical axis of each color light optical system, and independently adjusting the irradiation position and range of each color light to the corresponding light modulation means. 3. A light source that emits illumination light; a spectral unit that splits the illumination light emitted from the light source into a plurality of color lights; and a modulated light that receives each of the color lights separated by the spectral unit as illumination light. A plurality of light modulating means for emitting light, a light synthesizing means for synthesizing a plurality of modulated lights emitted from each of the light modulating means, and an optical path for guiding each color light split by the spectroscopic means to a corresponding light modulating means. A plurality of optical systems for color light to be formed; a plurality of transmission optical elements arranged in an optical path of the optical system for each color light, and capable of adjusting an irradiation area of each color light to a corresponding light modulation unit; A plurality of adjusting means capable of moving in a predetermined direction with respect to the optical axis of each color light optical system, and independently adjusting the irradiation position of each color light to the corresponding light modulating means; Light projected on the screen Projection display device and a system. 4. A light source that emits illumination light, a spectral unit that splits the illumination light emitted from the light source into a plurality of color lights, and receives each color light split by the spectral unit as illumination light and modulates the modulated light. A plurality of light modulating means for emitting light, a light synthesizing means for synthesizing a plurality of modulated lights emitted from each of the light modulating means, and an optical path for guiding each color light split by the spectroscopic means to a corresponding light modulating means. A plurality of optical systems for color light to be formed; a plurality of transmission optical elements arranged in an optical path of the optical system for each color light, and capable of adjusting an irradiation area of each color light to a corresponding light modulation unit; Can be moved in a predetermined direction with respect to the optical axis of each color light optical system, and a combination of a plurality of adjustment means for independently adjusting the irradiation position and range of each color light to the corresponding light modulation means and the light combining means. Project light onto the screen A projection display device having a projection optical system. 5. A light source that emits illumination light, and a spectral unit that splits the illumination light emitted from the light source into a plurality of color lights.
Forming a plurality of light modulating means for receiving each color light split by the spectroscopic means as illumination light and emitting modulated light, and forming an optical path for guiding each color light split by the spectroscopic means to a corresponding light modulating means. An illumination light adjusting method for an illumination device including a plurality of optical systems for color light and a plurality of transmission optical elements arranged in respective optical paths of the optical systems for each color light, wherein each color light is transmitted to a corresponding light modulating unit. An illumination light adjustment method for an illumination device, wherein an illumination position as illumination light is adjusted by independently moving each of the transmission optical elements in a predetermined direction with respect to the optical axis of each color light optical system. 6. A light source that emits illumination light, and a spectral unit that splits the illumination light emitted from the light source into a plurality of color lights.
Forming a plurality of light modulating means for receiving each color light split by the spectroscopic means as illumination light and emitting modulated light, and forming an optical path for guiding each color light split by the spectroscopic means to a corresponding light modulating means. An illumination light adjusting method for an illumination device including a plurality of optical systems for color light and a plurality of transmission optical elements arranged in respective optical paths of the optical systems for each color light, wherein each color light is transmitted to a corresponding light modulating unit. An illumination light adjustment method for an illumination device, wherein an illumination position and a range as illumination light are adjusted by independently moving each of the transmission optical elements in a predetermined direction with respect to an optical axis of each color light optical system.