JP2007114347A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which performs optical modulation at two stages, with the optical system reduced in size. <P>SOLUTION: An optical path in a projector 10 successively changes from a first direction AB to a fourth direction GH through a second direction CD and a third direction EF, and the optical system constituting the projector 10 is so compact as to be efficiently held in the square optical path. Therefore, the projector 10 is housed in extremely narrow space because of the compact optical system, and the miniaturization of the projector 10 is efficiently achieved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a projector that projects a color image using a light modulation device such as a liquid crystal panel.

As a conventional projector, the transmittance of each color liquid crystal panel arranged on the RGB three-color optical path is modulated, and the transmittance of the high-definition liquid crystal panel provided on the optical path after combining the dispersed light is adjusted. When modulating and displaying a color image, there is one that makes the light transmittance of each component emitted from a high-precision liquid crystal panel proportional to the inverse γ correction values of R, G, and B (see Patent Document 1).

As a similar projector, a projector including a video display liquid crystal panel and an illuminance display liquid crystal panel (see Patent Document 2), first to third light modulators for each color, and a light modulator for combined light are provided. There are some (see Patent Document 3), and those equipped with a first optical modulator and a second optical modulator (see Patent Document 4).
JP-A-6-167690 JP-A-9-116840 European Patent Publication No. EP1427271 US Pat. No. 5,987,142

However, the projector as described above needs to project an image formed by each color liquid crystal panel or the like onto a high-definition liquid crystal panel or the like by a high-precision relay lens, and the optical system tends to increase in size as a whole.

Accordingly, an object of the present invention is to provide a projector that performs light modulation in two stages and that suppresses an increase in the size of an optical system.

In order to solve the above problems, a first projector according to the present invention includes (a) an illumination device including a light source, (b) a color separation optical system that separates light from the illumination device into a plurality of color lights, and (c 1) a first light modulation device that modulates a plurality of color lights in accordance with image information; (d) a light combining optical system that combines the modulated light of each color modulated by the first light modulation device; and (e) a light combining optical system. A relay lens that temporarily forms an image of the combined light synthesized by the above, (f) a second light modulation device that modulates the image light imaged by the relay lens according to image information, and (g) a second light modulation device. A projection optical system for projecting the image light modulated in (1). Further, in the first projector, the lighting device is
An optical path that bends in a second direction substantially orthogonal from the first direction, and the color separation optical system, the first light modulation device, and the light combining optical system parallelize the image light emitted from the light combining optical system in the first direction. And has an optical path that emits light in the third direction.

In the projector, the illumination device has an optical path that is bent in a second direction substantially orthogonal from the first direction, and the color separation optical system, the first light modulation device, and the light synthesis optical system are emitted from the light synthesis optical system. Since it has an optical path for emitting light in a third direction that travels in parallel and reverse to the first direction, a U-shaped optical path that is bent in two stages from the first to the third direction is formed from the illumination device to the light combining optical system. Therefore, the optical system constituting the projector can be stored in a narrow rectangular space, and the projector can be reduced in size.

In a specific aspect of the present invention, in the first projector, one of the projection optical system and the relay lens emits light from the light combining optical system in a fourth direction that is parallel to the second direction and reverses. A mirror is included that has an optical path and that bends light that has passed through the light combining optical system from the third direction to the fourth direction. In this case, as a whole, a rectangular optical path that is bent in three stages in the first to fourth directions is formed, and the projector can be further downsized.

In another aspect of the present invention, in the first projector, the projection optical system has an optical path for emitting the image light emitted from the second light modulation device in the third direction as it is in the third direction. In this case, the projection optical system is a linear type, and the projection optical system is easily arranged at the center. When the projector is fixed on the ceiling side, a ceiling hanger is usually installed on the ceiling corresponding to the center of the screen. Therefore, by disposing the projection optical system on the center side of the projector as described above, the operation of setting the projector in consideration of image distortion and brightness uniformity becomes simple and highly accurate.

A second projector according to the present invention includes (a) an illumination device including a light source, (b) a color separation optical system that separates light from the illumination device into a plurality of color lights, and (c) a plurality of color lights. A first light modulation device that modulates each image according to image information; (d) a light combining optical system that combines the modulated light beams of the respective colors modulated by the first light modulation device; and (e) a combination combined by the light combining optical system. A relay lens that forms an image of light once; (f) a second light modulation device that modulates image light imaged by the relay lens according to image information; and (g) an image modulated by the second light modulation device. A projection optical system for projecting light. In the second projector, the color separation optical system, the first light modulation device,
And a light combining optical system having a light path that is bent so that light incident on the color separation optical system from the first direction is emitted from the light combining optical system in a second direction substantially orthogonal to the first direction, Either one of the system and the relay lens has an optical path for emitting light from the light combining optical system in a third direction that is parallel to the first direction and travels backward.

In the projector, the color separation optical system, the first light modulation device, and the light combining optical system transmit light incident on the color separation optical system from the first direction in a second direction substantially orthogonal to the first direction from the light combining optical system. Since the projection optical system and the relay lens have an optical path that emits light from the light combining optical system in a third direction that is parallel to the first direction and reversely travels, from the color separation optical system. A U-shaped optical path that is bent in two stages in the first to third directions is formed over the projection optical system. Therefore, the optical system constituting the projector can be stored in a narrow rectangular space, and the projector can be reduced in size.

In a specific aspect of the present invention, in the second projector, the illumination device has an optical path for emitting light emitted from the light source in the first direction in the first direction. In this case, the illuminating device is a linear type, and a high-luminance image can be projected by a projector with improved light utilization efficiency.

In another aspect of the present invention, in the first and second projectors, the color separation optical system includes:
A first dichroic mirror for branching light from the illumination device into first color light and second and third color light; a second dichroic mirror for branching second color light and third color light; and first and third color light A plurality of mirrors guided to the light combining optical system by bending the optical path, and the light combining optical system has a pair of dichroic mirrors arranged in an X-shaped section. In this case, space saving can be achieved while simplifying the structure of the color separation optical system and the photosynthesis optical system.

In still another aspect of the present invention, the color separation optical system, the first light modulation device, and the light combining optical system include:
It is integrated. In this case, these portions can be handled as a unit, and high accuracy and miniaturization can be easily achieved.

[First Embodiment]
FIG. 1 is a schematic diagram showing an optical system of a projector 10 according to the first embodiment of the present invention.
The projector 10 is an optical device for modulating a light beam emitted from a light source according to image information to form an optical image, and enlarging and projecting the optical image on a screen (not shown). A light source lamp unit 20, a uniform illumination optical system 30, a color separation device 40, a light modulation unit 50, a cross dichroic prism 60, a relay lens unit 70, a luminance modulation device 80, and a projection optical system 90. Here, the uniform illumination optical system 30, the color separation device 40, the light modulation unit 50, and the cross dichroic prism 60 are housed and integrated in a casing made of a light shielding body, which facilitates handling and ensuring accuracy. ing.

The light source lamp unit 20 is a light source for collecting and emitting light beams emitted from the light source lamp 21 to the surroundings and illuminating the light modulation unit 50 via the uniform illumination optical system 30 and the color separation device 40. A light source lamp 21, an elliptical concave mirror 22 that reflects the light source light emitted from the light source lamp 21, and a filter 23 that removes infrared rays from the light source light reflected by the concave mirror 22.
With. In the light source lamp unit 20, the light source light emitted from the light source lamp 21 passes through the filter 23 while being converged via the concave mirror 22 and is emitted to the uniform illumination optical system 30 side.

The uniform illumination optical system 30 collimates the light beam emitted from the light source lamp unit 20 and then divides the light beam into a plurality of partial light beams, and makes the plurality of light beams overlap and enter the target illumination region. This is an optical system for making the internal illuminance uniform, and the light source lamp unit 20
It functions as an illuminating device for generating illumination light in cooperation with. The uniform illumination optical system 30 includes a concave lens 39, a first lens array 31, a second lens array 32, a polarization conversion member 34, a condenser lens 35, and a mirror 37.

The concave lens 39 collimates the light source light emitted in the first direction AB from the light source lamp unit 20 and emits the light toward the front side, that is, the first lens array 31 side. Various concave mirrors such as a paraboloid can be used instead of the elliptical concave mirror 22 described above, and in this case, a parallel light beam is incident on the first lens array 31 without providing the concave lens 39 at the subsequent stage of the concave mirror 22. be able to.

The first lens array 31 has a function as a light beam splitting optical element that splits a light beam from the light source lamp unit 20 that has passed through the concave lens 39 into a plurality of partial light beams, and is arranged in a matrix in a plane orthogonal to the system optical axis IX. A plurality of small lenses are arranged. The outline shape of each small lens is a liquid crystal light valve 51b, 51g, 51 that constitutes a light modulation unit 50 described later.
It is set so as to be almost similar to the shape of the image forming area of r. Second lens array 3
Reference numeral 2 denotes an optical element that condenses a plurality of partial light beams divided by the first lens array 31 described above, and is arranged in a matrix in a plane orthogonal to the system optical axis IX, like the first lens array 31. However, it is not necessary for the contour shape of each small lens to correspond to the shape of the image forming area of the liquid crystal light valves 51b, 51g, 51r.

The polarization conversion member 34 is formed of a PBS array and a phase difference plate, and has a role of aligning the polarization direction of each partial light beam divided by the first lens array 31 with one direction of linearly polarized light.
Although the PBS array of the polarization conversion member 34 is not shown in detail, the system optical axis I
A configuration in which polarization separation films and reflection mirrors that are inclined with respect to X are alternately arranged is provided.
The former polarization separation film transmits one polarized light beam among the P-polarized light beam and S-polarized light beam included in each partial light beam, and reflects the other polarized light beam. The other polarized light beam reflected is bent by the latter reflecting mirror and emitted in the emission direction of the one polarized light beam, that is, the direction along the system optical axis IX. One of the emitted polarized light beams is polarized and converted by a phase difference plate provided in a stripe shape on the light beam exit surface of the PBS array of the polarization conversion member 34, and the polarization directions of all the polarized light beams are aligned. By using such a polarization conversion member 34, it is possible to align the light beam emitted from the light source lamp 21 with the polarized light beam in one direction, so that the utilization factor of the light source light used in the light modulation unit 50 is improved. Can do.

The condenser lens 35 condenses a plurality of partial light beams that have passed through the first lens array 31, the second lens array 32, and the polarization conversion member 34, and superimposes them on the image forming areas of the liquid crystal light valves 51b, 51g, 51r. It is a superposition optical element for making it enter. The light beam emitted from the condenser lens 35 is emitted to the next-stage color separation device 40 while being made uniform. In other words, the illumination light that has passed through both the lens arrays 31 and 32 and the condenser lens 35 passes through the color separation device 40 described in detail below, and then the light modulator 50, that is, the liquid crystal light valves 51b and 51g for each color.
, 51r are uniformly superimposed and illuminated.

The mirror 37 bends the system optical axis IX by 90 ° in a plane parallel to the paper surface. In other words, the light beam emitted from the condenser lens 35 is bent by the mirror 37 from the initial first direction AB to the second direction CD orthogonal thereto, and enters the color separation device 40. In other words, by providing the mirror 37, the direction in which the optical path from the light source lamp unit 20 or the uniform illumination optical system 30 extends can be switched by 90 °.

The color separation device 40 functions as a color separation optical system that separates illumination light into each color and guides the illumination light to the light modulation unit 50, and includes first and second dichroic mirrors 41a and 41b, reflection mirrors 42a and 42b,
42c, field lenses 43r, 43b, 43g, and a relay optical system 46. Among these, the optical part including the first and second dichroic mirrors 41a and 41b converts the illumination light into three light beams of blue (B) light, green (G) light, and red (R) light. To separate. Each dichroic mirror 41a, 41b is an optical element obtained by forming on a transparent substrate a dielectric multilayer film having a wavelength selection function of reflecting a light beam in a predetermined wavelength region and transmitting a light beam in another wavelength region. Yes, they are arranged in an inclined state with respect to the system optical axis IX. The first dichroic mirror 41a reflects the blue light LB among the three colors of red, blue, and green (R, G, and B) and transmits the green light LG and the red light LR. The second dichroic mirror 41b reflects the green light LG out of the incident green light LG and red light LR and transmits the red light LR.

In the color separation device 40, the illumination light incident from the light source lamp unit 20 via the uniform illumination optical system 30 first enters the first dichroic mirror 41a. The blue light LB reflected by the first dichroic mirror 41a is guided to the first optical path OP1, and is reflected by the reflection mirror 42a.
Then, it enters the field lens 43b at the final stage. The first dichroic mirror 4
The green light LG transmitted through 1a and reflected by the second dichroic mirror 41b is reflected in the second optical path O.
It is guided to P2 and enters the final stage field lens 43g. Further, the red light LR that has passed through the second dichroic mirror 41b is guided to the third optical path OP3, and the reflection mirrors 42b and 4b.
The light then enters the final stage field lens 43r via 2c and the relay optical system 46. Each of the field lenses 43r, 43b, and 43g provided on the emission side of the color separation device 40 has a partial light beam emitted from the second lens array 32 and incident on the light modulation unit 50 with respect to the system optical axis IX. It is provided so as to be incident at an appropriate angle.

As is clear from the drawing, the relay optical system 46 has a red color with the longest distance among the optical paths OP1, OP2, OP3 from the light source lamp unit 20 to the liquid crystal light valves 51b, 51g, 51r of the respective colors. Is disposed on the third optical path OP3. The relay optical system 46 includes a first lens 46a and a second lens 46b along the optical path, and an image formed immediately before the incident-side first lens 46a is transferred to the second lens 46b at the next stage. Through this, the light is transmitted to the field lens 43r on the exit side almost as it is to prevent the light use efficiency from being lowered due to light diffusion or the like.

The light modulation unit 50 includes three liquid crystal light valves 51b, 51g, and 51r on which illumination lights LB, LG, and LR of three colors are incident, respectively. Each of the liquid crystal light valves 51b, 51g, and 51r functions as a first light modulation device that modulates illumination light to generate image light, and includes three liquid crystal panels and three sets of polarized light disposed so as to sandwich each liquid crystal panel. And a filter. That is, the liquid crystal light valves 51b, 51g, 51r for each color can two-dimensionally modulate the luminance of the illumination light of each color by the liquid crystal panel for each color and the pair of polarizing filters sandwiching the liquid crystal panel. The liquid crystal panel incorporated in the liquid crystal light valves 51b, 51g, and 51r is obtained by sealing and enclosing a liquid crystal as an electro-optical material between a pair of transparent glass substrates, for example, polysilicon TF.
Using T as a switching element, the polarization direction of the polarized light beam incident on each is modulated in accordance with a given image signal.

In the light modulator 50, the blue light LB guided to the first optical path OP1 enters the image forming area of the liquid crystal light valve 51b via the field lens 43b. The green light LG guided to the second optical path OP2 enters the image forming area of the liquid crystal light valve 51g through the field lens 43g. The red light LR guided to the third optical path OP3 is the first and second lenses 46.
The light enters the image forming area of the liquid crystal light valve 51r through the relay optical system 46 and the field lens 43r. The color light beams LB, LG, and LR incident on the liquid crystal light valves 51b, 51g, and 51r are respectively converted into the liquid crystal light valves 51b, 51g, and 51r.
The transmission state is adjusted on a pixel-by-pixel basis in accordance with a drive signal or control signal input as an electrical signal in accordance with image information. At that time, the polarization direction of the illumination light incident on the liquid crystal panel sandwiched between the three sets of polarizing filters constituting the liquid crystal light valves 51b, 51g, 51r is adjusted and emitted from each liquid crystal panel. Modulated light having a predetermined polarization direction is extracted from the light.

The cross dichroic prism 60 is a light combining optical system that forms a color image by combining optical images modulated for the respective color lights emitted from the emission side polarizing plate. The cross dichroic prism 60 is a quadrangular prism having a substantially square shape in plan view in which four right angle prisms are bonded together. A pair of dielectric multilayer films 6 intersecting in an X shape is formed at the interface where the right angle prisms are bonded together.
1,62 are formed. One first dielectric multilayer film 61 is a dichroic mirror that reflects blue light, and the other second dielectric multilayer film 62 is a dichroic mirror that reflects red light. The cross dichroic prism 60 reflects the blue light LB from the liquid crystal light valve 51b by the first dielectric multilayer film 61, and the relay lens unit 70 on the right in the traveling direction.
The red light LR from the liquid crystal light valve 51r is reflected by the second dielectric multilayer film 62 and emitted to the relay lens unit 70 side on the left in the traveling direction, and both the green light LG from the liquid crystal light valve 51g is emitted. It goes straight through and exits through the dielectric multilayer films 61 and 62. As a result, the combined light emitted from the cross dichroic prism 60 is obtained by bending the light incident on the color separation device 40 from the second direction CD in the third direction EF orthogonal to the light.

The relay lens unit 70 synthesizes three image lights (light intensity distributions) formed on the image forming areas of the three liquid crystal light valves 51b, 51g, and 51r by a cross dichroic prism 60 on the way, and the luminance described later. It has a function of accurately transmitting the light intensity distribution on the image forming area of the modulation device 80 and with almost no light loss.
The relay lens unit 70 is composed of a large number of lens elements including a spherical surface and an aspherical surface so that a projected image can be formed at the same magnification, for example, on the order of several tens of microns. It is a highly accurate relay lens corrected to.

The luminance modulation device 80 includes a second light modulation device, that is, a liquid crystal light valve for luminance modulation, and is arranged so as to sandwich the liquid crystal panel and the liquid crystal panel, similarly to the liquid crystal light valves 51b, 51g, and 51r. A pair of polarizing filters. The liquid crystal light valve constituting the luminance modulation device 80 has a configuration in which a plurality of pixels whose transmittance can be controlled independently are arranged in a matrix, and the three images from the liquid crystal light valves 51b, 51g, 51r described above. The combined light obtained by combining the light is light-modulated again based on the display image data, and the modulated light corresponding to the image light to be finally projected is emitted. The image light that has passed through the luminance modulation device 80 is modulated in two stages by the combination with the light modulation unit 50, and the contrast is extremely high by the two-stage modulation.

The projection optical system 90 includes a reflecting prism 91 and a projection lens 92, and screens the image light of the optical image formed on the image forming area on the liquid crystal light valve of the luminance modulation device 80 with an appropriate magnification. Projected as a color image (not shown). Here, the light beam emitted from the luminance modulation device 80 is bent by the mirror 91a provided on the reflecting prism 91 from the third direction EF in which the relay lens unit 70 extends to the fourth direction GH orthogonal to the projection optical system. 90 is incident.

Hereinafter, the operation of the projector 10 shown in FIG. 1 will be described. Light source lamp unit 20
From the first direction AB to the second direction CD is made uniform through the uniform illumination optical system 30.
It is bent by 0 ° and enters the color separation device 40. The illumination light emitted from the uniform illumination optical system 30 is separated into blue, green, and red light LB, LG, LR by the color separation device 40, and is modulated for each color by the liquid crystal light valves 51b, 51g, 51r, Cross dichroic prism 6
Through 0, it is optically synthesized as color image light. At this time, when the illumination light incident on the color separation device 40 is emitted from the cross dichroic prism 60 as combined light, the illumination light is bent by 90 ° from the second direction CD to the third direction EF. The third direction EF is parallel to and opposite to the first direction AB. The image light synthesized by the cross dichroic prism 60 is re-imaged on the luminance modulation device 80 by the relay lens unit 70, and the image light that has been luminance-modulated by the luminance modulation device 80 is subjected to third projection when passing through the projection optical system 90. From direction EF to fourth direction GH
And is projected onto a screen (not shown) disposed in front of the projector 10. The fourth direction GH is parallel to and opposite to the second direction CD. As a result, the optical path in the projector 10 sequentially changes from the first direction AB, through the second direction CD and the third direction EF, to the fourth direction GH. The optical system constituting the projector 10 is It is a small one that fits efficiently in the letter-shaped optical path. Therefore, the projector 10 can be accommodated in an extremely narrow rectangular space by a small optical system, and the projector 10 can be efficiently reduced in size.

In the first embodiment described above, the luminance modulation device 80 is disposed in front of the reflecting prism 91, but the luminance modulation device 80 may be disposed in the subsequent stage of the reflecting prism 91. In this case, there is an advantage that the back focus of the projection lens 92 can be shortened.

[Second Embodiment]
Hereinafter, the projector according to the second embodiment will be described. Note that the projector according to the second embodiment is obtained by partially changing the projector according to the first embodiment, and the same portions are denoted by the same reference numerals and redundant description is omitted. In addition, parts that are not particularly described are the same as those in the first embodiment.

FIG. 2 is a plan view illustrating the projector 110 according to the second embodiment. The projector 110 has a linear projection optical system 190. That is, the image light synthesized by the cross dichroic prism 60 is re-imaged on the luminance modulation device 80 by the relay lens unit 70, and the image light modulated by the luminance modulation device 80 is projected by the projection optical system 190 on the projector 110. It is projected on a screen (not shown) arranged in front. As a result, the optical path in the projector 110 sequentially changes from the first direction AB, through the second direction CD, to the third direction EF, and the optical system constituting the projector 110 has a U-shape. It is a small one that fits efficiently in the optical path. Therefore, the projector 110 can be reduced in size. Further, in the projector 110, the projection optical system 190 is a linear type,
Since the projection optical system 190 can be disposed relatively in the center of the projector 110, the balance of the structure and appearance of the projector 110 can be improved, and installation and adjustment of the projector 110 can be easily performed. In particular, the projector 110 provided with the luminance modulation device 80.
Are large and large, and are often fixed to the ceiling of a hall or the like and used in a suspended state. Further, the ceiling hanger is usually placed in the center of the screen. Therefore, the projection optical system 190
In the projector 110 arranged at the center of the apparatus, it is possible to easily ensure distortion of the image and uniformity of brightness when setting the ceiling mount. Furthermore, in a projector in which the projection optical system is disposed at a position where the apparatus is biased (for example, a position where the projection optical system is biased to either the left or right side of the apparatus), the projection optical system is disposed at a position corresponding to the center of the screen. As described above, the position of the ceiling hanger is changed to a position deviated from the center of the screen. Or, when a projector in which the projection optical system as described above is arranged at a biased position of the apparatus is attached to a ceiling mount attached according to the center of the screen, the projector is either left or right with respect to the screen. However, the projector 110 described in the present embodiment does not impair the aesthetics at the installation location.

[Third Embodiment]
Hereinafter, the projector according to the third embodiment will be described. Note that the projector of the third embodiment is a partial modification of the projector of the first embodiment.

FIG. 3 is a plan view illustrating the projector 210 according to the third embodiment. The projector 210 has a uniform illumination optical system 230. That is, from the light source lamp unit 20 to the second
The light emitted in the direction CD is made uniform through the uniform illumination optical system 230, is emitted as it is in the second direction CD, and enters the color separation device 40. As a result, the optical path in the projector 10 sequentially changes from the second direction CD, through the third direction EF, to the fourth direction GH, and the optical system constituting the projector 210 has a U-shape. It is a small one that fits efficiently in the optical path. Therefore, the projector 210 can be reduced in size. Further, in the projector 210, the uniform illumination optical system 230 is a linear type, the illumination optical path can be shortened, and the number of optical elements for bending the optical path such as a mirror can be reduced. Can be reliably reduced. That is, the illumination light can be used efficiently and a high-luminance image can be projected.

In addition, this invention is not restricted to said embodiment, In the range which does not deviate from the summary, it can implement in a various aspect, For example, the following deformation | transformation is also possible.

That is, in the above embodiment, the two lens arrays 31 and 32 are used to divide the light from the light source lamp unit 20 into a plurality of partial light beams, but the present invention does not use such a lens array. It is also applicable to. Also, the lens arrays 31, 32
Can be replaced with a rod integrator. Furthermore, although the polarization conversion member 34 that converts the light from the light source lamp unit 20 into polarized light in a specific direction is used, the present invention is also applicable to a projector that does not use such a polarization conversion member 34.

In the above embodiment, the red liquid crystal light valve 51g is connected to the relatively long third optical path OP3.
Although the relay optical system 46 is arranged in the third optical path OP3, other blue and green colors can be guided to the relatively long third optical path OP3. In this case, blue light or green light is transmitted to the corresponding liquid crystal panel by the relay optical system 46.

Further, as the projector, there are a front projector that projects an image from the direction of observing the projection surface and a rear projector that projects an image from the side opposite to the direction of observing the projection surface. The projector 10 shown in FIG. , 110, 210 can be applied to any of them.

It is a figure explaining the optical system of the projector which concerns on 1st Embodiment. It is a figure explaining the optical system of the projector which concerns on 2nd Embodiment. It is a figure explaining the optical system of the projector which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,110,210 ... Projector, 20 ... Light source lamp unit, 21 ... Light source lamp, 30 ... Uniform illumination optical system 31, 32 ... Lens array, 34 ... Polarization conversion member,
35 ... Condenser lens, 37 ... Mirror, 40 ... Color separation device, 41a, 41b ...
Dichroic mirrors, 42a, 42b, 42c ... reflective mirrors, 43r, 43b, 4
3g ... Field lens, 46 ... Relay optical system, 50 ... Light modulator, 51b ... Liquid crystal light valve for blue, 51g ... Liquid crystal light valve for green, 51r ... Liquid crystal light valve for red,
60: Cross dichroic prism 61, 62: Dielectric multilayer film 70: Relay lens unit 80: Luminance modulator 90: Projection optical system 91: Reflection prism
92 ... Projection lens, AB ... First direction, CD ... Second direction, EF ... Third direction, GH
... 4th direction, IX ... System optical axis, LB, LG, LR ... Each color light

Claims (7)

An illumination device including a light source;
A color separation optical system for separating light from the illumination device into a plurality of color lights;
A first light modulation device for respectively modulating the plurality of color lights according to image information;
A light combining optical system for combining the modulated light of each color modulated by the first light modulation device;
A relay lens that once forms an image of the combined light combined by the light combining optical system;
A second light modulation device that modulates image light imaged by the relay lens according to image information;
A projection optical system for projecting the image light modulated by the second light modulation device,
The lighting device has an optical path that bends in a second direction substantially orthogonal from the first direction,
The color separation optical system, the first light modulation device, and the light combining optical system have an optical path for emitting image light emitted from the light combining optical system in a third direction that is parallel to the first direction and travels backward. projector. Either one of the projection optical system and the relay lens has an optical path for emitting light from the light combining optical system in a fourth direction that is parallel to the second direction and reversely travels, and light that has passed through the light combining optical system. The projector according to claim 1, further comprising a mirror that bends the third lens from the third direction to the fourth direction. 2. The projector according to claim 1, wherein the projection optical system has an optical path for emitting image light emitted from the second light modulation device in the third direction as it is in the third direction. An illumination device including a light source;
A color separation optical system for separating light from the illumination device into a plurality of color lights;
A first light modulation device for respectively modulating the plurality of color lights according to image information;
A light combining optical system for combining the modulated light of each color modulated by the first light modulation device;
A relay lens that once forms an image of the combined light combined by the light combining optical system;
A second light modulation device that modulates image light imaged by the relay lens according to image information;
A projection optical system for projecting the image light modulated by the second light modulation device,
The color separation optical system, the first light modulation device, and the light combining optical system receive light incident on the color separation optical system from a first direction from the light combining optical system in a second direction substantially orthogonal to the first direction. Having an optical path that bends to emit in the direction,
One of the projection optical system and the relay lens has a light path that emits light from the light combining optical system in a third direction that is parallel to the first direction and reversely travels. The projector according to claim 4, wherein the illuminating device has an optical path for emitting light emitted from the light source in the first direction in the first direction. The color separation optical system includes: a first dichroic mirror that branches light from the illumination device into first color light and second and third color light; and a second dichroic that branches the second color light and the third color light. A mirror and a plurality of mirrors for guiding the first and third color lights to the light combining optical system by bending an optical path, the light combining optical system including a pair of dichroic mirrors arranged in an X-shaped section. The projector according to any one of claims 1 to 5. The projector according to any one of claims 1 to 6, wherein the color separation optical system, the first light modulation device, and the light combining optical system are integrated.

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