JP2004144816A - Illumination optical device and projector using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination optical device capable of improving the utilization factor of light source light and a projector using the optical device. <P>SOLUTION: The illumination optical device to illuminate an optical modulator 20 having an image forming area where an optical image is formed by optically modulating incident luminous flux in accordance with image information is equipped with a multicolor light source 11 equipped with a plurality of color light emitting sources arrayed in a belt state and emitting multicolor light where respective color light beams are arrayed in a belt state, a variable color scanning illumination means 13 scanning and illuminating the image forming area while scrolling the multicolor light emitted from the light source 11 in the arraying directions of the respective color light beams, and a pseudo light source generating means 14 capturing the color light beam coming off from the image forming area of the optical modulator out of the color light beams emitted from the illumination means 13 and generating a pseudo light source adjacently to the light source 11 with the captured color light beam. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an illumination optical device for illuminating a light modulation device having an image forming area for forming an optical image by optically modulating an incident light beam according to image information, and a projector using the same.
[0002]
[Background Art]
2. Description of the Related Art Conventionally, a projector that modulates a light beam emitted from a light source in accordance with image information to form a color image, and performs enlarged projection has been used. Such projectors have been widely used for home theater applications in recent years, in addition to presentations using computers at conferences and conferences.
In recent years, as a light modulation device used in such a projector, a DMD (Digital Micro-mirror Device: a trademark of TI Co., Ltd.) that performs light modulation by controlling the incident angle of a micromirror has been known in recent years (eg, for example). Patent Document 1).
This DMD is configured such that each pixel (pixel) arranged two-dimensionally is constituted by a micromirror, and the inclination of the micromirror is controlled by an electrostatic field effect of a memory element arranged immediately below each pixel. ing. Then, by controlling the tilt of the micromirror, an on / off state is created by changing the reflection angle of the incident light flux, and the light reflected in a predetermined direction enters the projection lens and is projected as image light.
[0003]
Here, in the DMD, since the response speed of the micromirrors constituting each pixel is high, as a method of forming a color image, for example, three primary colors of R, G, and B are sequentially sequentially formed for only 1/3 period of one field. In some cases, a field color sequential method of displaying and displaying a color image by using color mixture by a time integration action of a visual system is employed. Specific examples of the field color sequential method include, for example, using a color wheel in which three primary colors of R, G, and B are arranged in the rotation direction between a white light source and a DMD, and synchronizing each color with the rotation of the color wheel. Some devices perform light modulation in light units.
In addition, a multicolor light source in which light emission sources of R, G, and B are arranged in a strip shape is used, and the multicolor light emitted from the multicolor light source is simultaneously illuminated to each one-third of the area of the image forming area. There is one that performs scan illumination while scrolling in the arrangement direction of colored light (for example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-8-334709
[Patent Document 2]
JP-A-2002-55307 (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, the conventional field color sequential method described above has the following problem. First, in the method using a color wheel, when the light modulator is illuminated with any one of R, G, and B light, the other color light is absorbed by the color wheel. The illuminance is reduced to ３ to に 対 し て of the illumination illuminance inherent to the light source light.
On the other hand, in the method of performing scan illumination while scrolling described in Patent Literature 2, when illuminating while scrolling over an image forming area, part of the illumination light may deviate from the image forming area depending on the state of scrolling. After all, it is hard to say that the light from the light source is used sufficiently efficiently.
[0006]
An object of the present invention is to provide an illumination optical device capable of improving the utilization rate of light from a light source, and a projector using the same.
[0007]
[Means for Solving the Problems]
The illumination optical device according to the present invention is an illumination optical device that illuminates a light modulation device having an image forming region that forms an optical image by optically modulating an incident light beam according to image information, and includes a plurality of colors arranged in a band shape. A multicolor light source that emits polychromatic light in which each color light is arranged in a band shape, and the polychromatic light emitted from this polychromatic light source is scrolled in the arrangement direction of each color light to form the image forming area. A variable-color scan illuminating unit for performing scan illumination, and of the color light emitted from the variable-color scan illuminator, captures color light deviating from an image forming area of the light modulation device, and causes the captured color light to be adjacent to the multicolor light source. And a pseudo light source generating means for generating a pseudo light source.
[0008]
Here, the multicolor light source refers to a light source that can simultaneously illuminate the image forming area of the light modulation device with a plurality of color lights, and can be configured to include a plurality of light emitting sources arranged in a band. As a light emitting source, for example, a light emitting diode or organic EL element of red, green, blue, or the like, and a plurality of wavelength selection films corresponding to an arrangement of polychromatic light are formed on a light emitting end surface of a glass rod, and the light of the glass rod is formed. It is conceivable to introduce white convergent light into the incident end face. The wavelength selection film is preferably configured to transmit only light of a predetermined wavelength and reflect light of other wavelengths, and is emitted from the predetermined wavelength selection film while repeating internal reflection in the glass rod.
[0009]
The variable color scan illumination means may employ a means utilizing rotation or swing of a mirror. For example, a galvanometer mirror or a polygon arranged in an illumination optical axis from a multicolor light source to a light modulator. Mirrors can be employed.
Further, the pseudo light source generating means includes a condensing optical system that narrows the color light deviating from the image forming area of the light modulation device, and the color light captured by the condensing optical system to a position optically adjacent to the multicolor light source. A light guiding system may be provided. The pseudo light source to be generated is preferably the same size as the multicolor light source, and is preferably located at a position adjacent to the emission source to be scanned and illuminated last in the multicolor light source.
[0010]
According to the present invention, for the color light deviating from the image forming area of the light modulation device, a pseudo light source can be generated at a position adjacent to the multicolor light source by the pseudo light source generation means and reused as the light source light. Therefore, the multicolor light emitted from the multicolor light source can be used without waste, and the utilization rate of the light from the light source can be greatly improved to provide an efficient illumination optical device.
[0011]
In the present invention, the pseudo light source generating means may include a light guide fiber for guiding color light outside the image forming area to a position adjacent to the multicolor light source.
Here, the light guide fiber repeats internal reflection of an optical fiber or the like to emit light incident on the light incident end face without loss from the light exit end face, and at least the light exit end face of the light guide fiber is a multicolor light source. Is preferably the same as the size of the light emitting source constituting
According to the present invention, a pseudo light source can be generated adjacent to a multicolor light source only by using a light guide fiber, so that the structure is simplified and the illumination optical device can be easily used in a projector or the like. Can be.
[0012]
In the present invention, a light-condensing optical system including at least one or more lenses is disposed on the light-incident side of the light-guiding fiber, and the light-incident end face of the light-guiding fiber and a virtual surface extending from the surface of the image forming area. It is preferable that the surface on which the color light illuminating the image forming area is located above the conjugate point of the light collecting optical system.
According to the present invention, when the color light deviating from the image forming area enters the light incident end face of the light guiding fiber via the condensing optical system, the color light enters the light guiding fiber in the same state as when the image forming area was illuminated. Since the color light can be incident, the size of the generated pseudo light source can be the same size as the light source of the multicolor light source.
[0013]
In the present invention, as the pseudo light source generating means, a reflection optical system including at least one or more mirrors for reflecting the deviated color light and guiding it to a position adjacent to the multicolor light source, and at least one or more lenses for condensing the color light It is conceivable to configure a condensing optical system including: a generation surface of the pseudo light source, and a surface on which a color light on the virtual surface extending from the surface of the image forming region and the color light outside the image forming region faces is formed by the condensing optical system. It is preferably located on the conjugate point of the optical optical system.
According to the present invention, since both surfaces are located on the conjugate point of the condensing optical system, the color light deviating from the image forming region can be guided to the pseudo light source generating surface with the size of the illumination region as it is. It can be the same size as the emission source of the color light source.
[0014]
The projector according to the present invention is a projector that modulates a light beam emitted from a light source in accordance with image information to form a color image and enlarges and projects the light beam. A reflection-type light modulation device that reflects the light toward the incident side and emits the reflected light.
Here, as the reflection-type light modulation device, a reflection-type liquid crystal display element or the above-described DMD can be employed, but it is preferable to employ a DMD having a high response speed of elements constituting pixels in the image forming region. .
According to the present invention, since the above-described functions and effects can be enjoyed, a projector having a high light source light utilization rate can be provided.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 shows a projector 1 according to a first embodiment of the present invention.
The projector 1 includes an illumination optical device 10, a DMD 20 as a reflection type light modulation device, a field lens 30, a projection lens 40 as a projection optical system, and a device control unit 50.
The projector 1 introduces a light beam emitted from the illumination optical device 10 into a DMD 20 via a field lens 30, performs light modulation in accordance with image information in the DMD 20, forms an optical image, and forms an optical image. The projection image is displayed on the screen 2 via the projection lens 40.
[0016]
The illumination optical device 10 includes a multicolor light source 11 that simultaneously emits red, green, and blue light, a relay lens 12, a galvano mirror 13 as a variable color scan illumination unit, and a pseudo light source generation unit 14 that generates a pseudo light source. Be composed.
As shown in FIG. 2, the multicolor light source 11 is formed by arranging red, green, and blue light emission sources 112R, 112G, and 112B in a strip shape on an exterior substrate 111.
As each of the light emitting sources 112R, 112G, and 112B in the present example, a self-luminous element such as a light emitting diode or an organic EL (Electro Luminescence) is used.
[0017]
The galvanomirror 13 pivotally supports the reflection surface so as to be rotatable around a predetermined axis, changes the rotation angle of the reflection surface according to an input electric signal, and bends the light beam incident on the reflection surface according to the rotation angle. Deflector. The galvanomirror 13 rotates in synchronization with an image signal input to the device control unit 50, and scans and illuminates an image forming area of the DMD 20, which is a surface to be irradiated.
As the galvanomirror 13, for example, a mirror in which a driving coil having a reflecting surface is rotatably connected to a base provided with a magnet by a hinge structure or the like can be adopted. When an electric signal is input to the driving coil, the Lorentz force is applied. Thus, the reflection surface can be driven to rotate.
The galvanomirror 13 is arranged such that the rotation axis of the reflection surface is in the direction of the normal to the surface defined by the illumination optical axis of the projector 1, and each color light emitted from the multicolor light source 11 is a relay lens. The light is condensed by the light source 12, is incident on the vicinity of the rotation center of the reflection part of the galvanomirror 13, and is incident on the image forming area of the DLP 20 via the field lens 30. The reflecting surface of the galvanomirror 13 is disposed at the light-exit-side focal position of the relay lens 12 and the light-incident-side focal position of the field lens 30, that is, at the pupil position of both lenses 12 and 30.
[0018]
The DMD 20 selects the reflection direction of the incident light beam by changing the tilt of the micromirror, and gives the incident light beam two-dimensional modulation based on image information. Then, the incident light flux becomes modulated light corresponding to the projected pixel.
For example, the DMD 20 is configured by integrating a large number of movable micromirrors on a semiconductor chip by micromachine technology based on a CMOS wafer process. The movable micromirror rotates about a diagonal axis and assumes a bistable state inclined at two predetermined angles (± θ). A large light deflection angle of 4θ is obtained between these two states, and optical switching with a good S / N ratio can be performed.
Among the light beams incident on the DMD 20, the light beam deflected in the + 2θ direction is projected as image light by the projection optical lens 40, and the light beam deflected in the −2θ direction is converted into unnecessary light by a light absorbing member (not shown). Absorbed. The light absorbing member is, for example, textured on its surface and further coated with a multilayer antireflection film. With such a surface, reflection of an incident light beam can be prevented by the microscopic shape effect and the principle of interference.
[0019]
FIG. 3 is a schematic configuration diagram schematically illustrating an example of a DMD.
In the DMD 20, an address electrode / bias bus layer 22, a hinge layer 23, a yoke layer 24, and a mirror layer 25 are sequentially formed on a CMOS substrate 21 by a sputtering method. An organic polymer or the like is filled as a sacrificial layer between the address electrode 22A and the hinge layer 23 / yoke layer 24 and between the hinge layer 23 / yoke layer 24 and the mirror layer 25. Then, after the completion of the film formation, the film is removed by plasma etching or the like, and the mirror layer 25 and the yoke layer 24 are opened and become rotatable.
The address electrode 22A is electrically connected to the lower CMOS substrate 21. When a predetermined bias voltage is applied to the address electrode 22A, electrostatic attraction is generated between the mirror layer 25 and the address electrode 22A, and the yoke layer 24. The mirror layer 25 and the yoke layer 24 rotate against the restoring force of the hinge layer 23. Here, the mirror layer 25 and the yoke layer 24 rotate until the spring tip 26 lands. When the bias voltage applied to the address electrode 22A is 0, the mirror layer 25 is at a substantially horizontal position due to the restoring force of the hinge layer 23. Here, a large light deflection angle of 4θ can be obtained by using the state between the state inclined to the left (+ θ) as shown in FIG. 3 and the state inclined to the right (−θ) not shown. it can.
[0020]
The field lens 30 guides the modulated light modulated by the DMD 20 to the projection lens 40. The red, blue, and green light emitted from the polychromatic light source 11 and reflected by the galvanometer mirror 13 is transmitted to the field lens 30. , And enters the image forming area of the DMD, and the modulated color lights pass through the field lens 30 again and enter the projection lens 40.
The light emitting surface of the multicolor light source 11 and the modulation surface of the image forming area of the DMD 20 are in a conjugate relationship by the relay lens 12 and the field lens 30. The projection lens 40 enlarges and projects the image light modulated by the DMD 20 on a screen. The projection lens 40 is configured as a group lens in which a plurality of light-collecting elements (not shown) are arranged along the optical axis direction for the purpose of preventing the projection image from being blurred due to chromatic aberration or the like in each of the R, G, and B color lights. I have.
[0021]
The device control unit 50 is electrically connected to the galvanomirror 13 and the DMD 20, and controls each operation. For example, the device control unit 50 drives the galvanomirror 13 to rotate in synchronization with the synchronization signal of the input image signal, changes the tilt position of the galvanomirror 13 according to the image signal, and changes the reflected light to the image formation of the DMD 20. The area is scroll-scanned in the order of red, green and blue.
For this reason, the drive signal input from the device control unit 50 to the DMD 20 is different for red, green, and blue for each of the image forming areas divided into 1/3 along the scanning direction. Signal is input.
[0022]
The simulated light source generation unit 14 is a unit that captures color light deviating from the image forming area of the DMD 20 and generates a simulated light source at a position adjacent to the multicolor light source 11, and includes relay lenses 141 and 142 and a light guide fiber 143. And
The relay lenses 141 and 142 are optical elements that capture color light that has deviated from the image forming area of the DMD 20, collect the captured color light, and make the captured color light incident on the light incident end face T of the light guide fiber 143. These relay lenses 141 and 142 have a tandem relationship and a relationship of the reverse magnification of the relay lens 12 and the field lens 30.
[0023]
Here, the relationship of the inverse magnification means that the focal length of the relay lens 12 is f1, the focal length of the field lens 30 is f2, the focal length of the relay lens 141 is f3, and the focal length of the relay lens 142 is f4. It means a relationship such that f2 / f1 = f3 / f4.
Further, as shown in FIG. 1, a surface S on a virtual surface extending the surface of the image forming area of the DMD 20, which is illuminated by color light that has deviated from the DMD 20, and a light incident end surface T of the light guide fiber 143 are Are conjugated by the relay lenses 141 and 142. The specifications and the setting optical paths of the relay lenses 141 and 142 are not limited to those of the present example as long as the above relation is satisfied, and various types can be adopted.
[0024]
The light guide fiber 143 is an optical element that guides color light deviated from the DMD 20 captured by the relay lenses 141 and 142 to a position adjacent to the multicolor light source 11. The light is emitted from the light exit end face U by repeating internal reflection.
As shown in FIG. 2, the light exit end face U of the light guide fiber 143 has the same dimensions as those in the direction orthogonal to the arrangement direction of the light emission sources 112R, 112G, and 112B of the multicolor light source 11, and these arrangements are the same. The dimension in the direction along the direction is set to be twice that of the light emitting sources 112R, 112G, and 112B. In this example, the light incident end face T of the light guide fiber 143 is also set to the same size as the light exit end face U.
The light emitting end face U of the light guide fiber 143 is aligned with the light emitting surface of the multicolor light source 11.
[0025]
Next, the operation of the present embodiment will be described with reference to FIG.
First, in the initial state (MODE1) of the galvanometer mirror 13, all the red, blue, and green color lights of the multicolor light source 11 irradiate the image forming area 20A of the DMD 20. At this time, the device control unit 50 outputs to the DMD 20 a driving signal for driving the 1/3 region from the right of the DMD 20 to red, driving the center 1/3 region to green, and driving the left 1/3 region to green. are doing.
[0026]
Next, the device control unit 50 outputs a control signal for rotating and driving the galvanomirror 13 to the galvanomirror 13, and drives the 1/3 region of the DMD 20 from the right to green driving and the center 1/3 to blue driving. The signal is output to the DMD 20, and the left 1/3 area is not driven (MODE2).
Here, in the conventional structure, since the light of the red light emitting source 112R of the multicolor light source 11 has deviated from the image forming area 20A due to the angle of the galvanomirror 13, the amount of light incident on the image forming area 20A is approximately It is reduced to 2/3.
On the other hand, in the structure of the present example, the light of the red light emitting source 112R is captured by the relay lenses 141 and 142, guided to a position adjacent to the multicolor light source 11 by the light guiding fiber 143, and The light emitting side end surface emits light as a pseudo light source, and red light is also illuminated to the left one-third of the image forming area 20A, so that the amount of light incident on the image forming area 20A does not decrease.
[0027]
Further, when the galvanomirror 13 is rotated (MODE3), only the blue driving signal is input to only the right area of the image forming area 20A, and no driving signal is input to the other 2/3 areas. .
In this case, in the conventional structure, since the light of the red light emitting source 112R and the light of the green light emitting source 112G of the multicolor light source 11 deviate from the image forming area 20A, the amount of light incident on the image forming area 20A is reduced to about 1/3. Resulting in.
On the other hand, in the structure of this example, similarly to the above, the light of the red light emitting source 112R and the light of the green light emitting source 112G are captured and emitted next to the multicolor light source 11, so that even in the state of MODE3, The amount of light incident on the image forming area 20A of the DMD 20 does not decrease.
As described above, the scan illumination of the image for one frame is completed, the apparatus control unit 50 returns the galvanomirror 13 to the MODE 1 state, and starts control based on the image information of the next frame.
[0028]
According to the above-described first embodiment, the following effects can be obtained.
(1) The color light deviating from the image forming area 20A of the DMD 20 generates a pseudo light source at a position adjacent to the multicolor light source 11 by the pseudo light source generation unit 14, and can be used again as light source light. Therefore, the multicolor light emitted from the multicolor light source 11 can be used without waste, and the utilization rate of the light of the multicolor light source 11 is greatly improved, so that the illumination optical device 10 can be made efficient.
(2) Since the pseudo light source can be generated adjacent to the multicolor light source 11 only by using the light guide fiber 143, the structure can be simplified, and the pseudo light source can be freely formed by drawing the light guide fiber 143. Since the light source can be generated, the degree of freedom of the internal layout is improved, and the light source can be suitably used for the projector 1.
[0029]
(3) When the color light deviating from the image forming area 20A is incident on the light incident end face T of the light guide fiber 143 via the relay lenses 141 and 142, the light is guided in the same state as the state where the image forming area 20A is illuminated. The pseudo light source emitted from the light emitting end face U of the light guide fiber 143 by making the color light incident on the fiber 143 can have the same size as the light emitting sources 112R, 112G, and 112B of the multicolor light source 11.
(4) In the scroll scan type projector 1, since the image forming area 20A of the DMD 20 can be illuminated with the same amount of light in all the MODEs 1 to 3, flicker occurs in the image projected on the screen 2 via the projection lens 40. And a projector 1 that can prevent color breakup and project a high-quality image.
(5) Since the light-emitting sources 112R, 112G, and 112B of the multicolor light source 11 are constituted by light-emitting elements such as an organic EL and a light-emitting diode, power required for driving the light source can be suppressed, and the power-saving projector 1 can be obtained. it can.
[0030]
[Second embodiment]
Next, a second embodiment of the present invention will be described. In the following description, the description of the same members and the like as those already described will be omitted or simplified. In the above-described first embodiment, the pseudo light source generation unit 14 of the illumination optical device 10 is configured by the relay lenses 141 and 142 and the light guide fiber 143, and the light emission sources 112R, 112G, and 112B of the multicolor light source 11 are formed of organic EL or the like. It consisted of a light emitting element.
On the other hand, in the projector 3 according to the second embodiment, as shown in FIGS. 5 and 6, the pseudo light source generation unit 64 of the illumination optical device 60 is configured by a lens and a mirror, and the multicolor light source 61 is provided with each color. The difference is that a light emitting element for each light is not used.
[0031]
That is, as shown in FIG. 5, the pseudo light source generation unit 64 of the projector 3 includes a pair of relay lenses 641, 642 and three mirrors 643, 644, 645.
The mirrors 643, 644, and 645 are reflection optical elements having a function of capturing, reflecting, and bending the color light that has deviated from the DMD 20 and guiding the light to a position adjacent to the multicolor light source 61.
[0032]
The relay lenses 641 and 642 are arranged in the optical path set by the mirrors 643, 644, and 645, and generate a pseudo light source image having the same size as the captured color light at a position adjacent to the multicolor light source 61. . For this reason, the surface S to be illuminated by the color light deviating from the DMD 20 and the pseudo light source generation surface V along the light emitting surface of the polychromatic light source 61 are conjugated by the relay lenses 641 and 642.
The relay lenses 641 and 642 have a tandem relationship and have a relationship of inverse magnification of the relay lens 12 and the field lens 30.
[0033]
The multicolor light source 61 includes a light source lamp 611, a reflector 612, and a rod 613, as shown in FIG.
The light source lamp 611 is a light source that emits white light, and employs the same light source as that used for a normal projector or the like. For example, an ultra-high pressure mercury lamp, a metal halide lamp, or the like is used as the light source lamp 611.
The reflector 612 is an elliptical mirror that condenses the white light emitted from the light source lamp 611 on the light incident end face of the rod 613. The light source lamp 611 is disposed at the first focal point of the reflector 612, and the light incident on the rod 613 The end face is located at the second focal point of the reflector 612. Note that a parabolic mirror can be used as the reflector 612, and in this case, a condenser lens is interposed between the reflector and the rod.
[0034]
The rod 613 is an optical element that emits white light incident on the light incident end face on the left side in the drawing from the light emitting end face on the right side in the drawing.
The rod 613 is made of glass or the like, and is not shown in the figure. However, a mask member having a hole in which the white light collected by the reflector 612 is formed substantially at the center is provided on the light incident end face. .
In addition, three types of wavelength selection films 613R, 613G, and 613B are formed on the light emitting end surface of the rod 613. Specifically, the wavelength selection film 613R transmits only red light and reflects other color light, and the wavelength selection film 613G transmits only green light and reflects other color light. Thus, the wavelength selection film 613B transmits only blue light and reflects other color lights.
[0035]
Then, the white light incident on the light incident end face of the rod 613 reaches the light emitting end face after being internally reflected inside the rod 613, and the light component in the wavelength region according to the wavelength selection films 613R, 613G, and 613B is: The light component of the other wavelength region emitted and reflected out of the rod 613 is again internally reflected and reflected by the mask member on the light incident end face side, and finally one of the wavelength selection films 613R, 613G, Injected out of the rod 613 from 613B.
The configuration and optical positional relationship of the other members are the same as in the above-described first embodiment, and a description thereof will be omitted.
[0036]
According to the projector 3 according to the second embodiment, the following effects are obtained in addition to the effects (1), (3), and (4) described in the first embodiment.
(6) Since the pseudo light source generation unit 64 is spatially guided to the position adjacent to the multicolor light source 61 by the lenses 641 and 642 and the mirrors 643, 644 and 645, the light amount loss is small, and the generated pseudo light source is generated. The light amount can be the same as that of the multicolor light source 61.
(7) Since a white light source such as an ultra-high pressure mercury lamp used in a normal projector can be adopted, the amounts of the polychromatic lights R, G, and B emitted from the rod 613 can be made equal to those of the white light source. It is easy to increase the brightness of the projected image.
[0037]
(Modification of Embodiment)
The present invention is not limited to the above-described embodiments, but includes the following modifications.
In each of the above embodiments, the galvanometer mirror 13 is used as the variable color scan illumination means, but the present invention is not limited to this, and a polygon mirror or the like may be employed. In short, any light source can be used as long as the light source light can be scroll-scan illuminated on the illuminated area.
[0038]
In the first embodiment, the light guide fiber 143 in which the light incident end face T and the light exit end face U have the same size and shape is used, but the present invention is not limited to this. That is, a light guide fiber in which the light incident end face is enlarged, and the light exit end face is reduced by stopping down in the middle may be adopted.
In each of the above embodiments, the DMD 20 is used as the light modulation device, but the present invention is not limited to this. That is, a reflection type liquid crystal device which is the same reflection type light modulation device may be adopted, and the present invention can be adopted to a transmission type light modulation device.
In addition, the specific structure, shape, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.
[0039]
[Brief description of the drawings]
FIG. 1 is a schematic view illustrating a structure of a projector according to a first embodiment of the invention.
FIG. 2 is a schematic diagram showing a structure of a multicolor light source in the embodiment.
FIG. 3 is a schematic diagram illustrating a structure of a reflection type light modulation device in the embodiment.
FIG. 4 is a schematic diagram for explaining the operation of the embodiment.
FIG. 5 is a schematic diagram illustrating a structure of a projector according to a second embodiment of the invention.
FIG. 6 is a schematic diagram illustrating a structure of a multicolor light source in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projector, 11, 61 ... Multicolor light source, 13 ... Galvano mirror (variable color scan illumination means), 14, 64 ... Pseudo light source generation part (Pseudo light source generation means), 20 ... DMD (Reflection type light modulation device), 20A: image forming area, 112R, 112G, 112B: light emitting source, 141, 142: relay lens (light collecting optical system), 143: light guide fiber, 641, 642: relay lens (light collecting optical system), 643, 644 645 mirror (reflection optical system)

Claims (5)

An illumination optical device that illuminates a light modulation device having an image forming region that modulates an incident light beam according to image information to form an optical image,
A multicolor light source that includes a plurality of color light emitting sources arranged in a band shape and emits multicolor light in which each color light is arranged in a band shape,
A variable-color scan illuminating unit that scans and illuminates the image forming area while scrolling the polychromatic light emitted from the polychromatic light source in the arrangement direction of each color light;
Pseudo light source generation for capturing color light out of the image forming area of the light modulation device out of the color light emitted from the variable color scan illumination means, and generating the pseudo light source adjacent to the multicolor light source Means,
An illumination optical device, comprising: The illumination optical device according to claim 1,
The illumination optical device, wherein the pseudo light source generation means includes a light guide fiber for guiding the deviated color light to a position adjacent to the multicolor light source. The illumination optical device according to claim 2,
A condensing optical system including at least one or more lenses is arranged on the light incident side of the light guide fiber,
The light incident end face of the light guide fiber, and the surface on which the color light outside the image forming area is illuminated on a virtual plane extending the surface of the image forming area, are located on the conjugate point of the condensing optical system. An illumination optical device, comprising: The illumination optical device according to claim 1,
The pseudo light source generating means includes a reflection optical system including at least one or more mirrors for reflecting the deviated color light and guiding the deviated color light to a position adjacent to the multicolor light source, and at least one or more lenses for condensing the color light. With a focusing optics,
The generation surface of the pseudo light source, and the surface on which the color light outside the image formation region is illuminated on the virtual surface extending from the image formation region surface, are located on the conjugate point of the light collection optical system. An illumination optical device characterized by the above-mentioned. A projector for optically modulating a light beam emitted from a light source in accordance with image information to form a color image and projecting it in an enlarged manner,
A projector comprising: the illumination optical device according to any one of claims 1 to 4; and a reflection-type light modulation device that reflects a modulated light beam to a light beam incident side and emits the light beam.

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