JP2009186647A - Illumination device and projector - Google Patents

Illumination device and projector Download PDF

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Publication number
JP2009186647A
JP2009186647A JP2008024958A JP2008024958A JP2009186647A JP 2009186647 A JP2009186647 A JP 2009186647A JP 2008024958 A JP2008024958 A JP 2008024958A JP 2008024958 A JP2008024958 A JP 2008024958A JP 2009186647 A JP2009186647 A JP 2009186647A
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light
element
illumination device
coherent light
deflecting
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JP2008024958A
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Japanese (ja)
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Susumu Ariga
進 有賀
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Seiko Epson Corp
セイコーエプソン株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device capable of effectively reducing speckle noise without using a mechanical driving means, and to provide a projector using the illumination device. <P>SOLUTION: The illumination device includes: a laser light source 11 as a light source section emitting coherent light; an electric optical element 12 as a light deflecting element deflecting the coherent light emitted from the light source section; and a light diffracting section 14 having a diffractive optical element including a plurality of diffusion illumination elements that diffuse the coherent light emitted from the light deflecting element and allows the light to propagate to the face to be illuminated. The light deflecting element has a deflecting section that changes a deflection angle continuously or in steps to deflect the coherent light in accordance with an electric field applied to the light deflecting element; and the plurality of diffusion illumination elements are disposed at a position where the coherent light deflected by the deflecting section enters. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting device and a projector, and more particularly to a technology of a lighting device using laser light.

  In recent years, a technique using a laser light source as a light source of a projector has been proposed. Compared with UHP lamps conventionally used as projector light sources, laser light sources have advantages such as high color reproducibility, instant lighting, and long life. The laser light source can be combined with a diffractive optical element that diffracts the laser light. The diffractive optical element can simultaneously perform shaping and enlargement of the irradiation area and equalization of the light amount distribution in the irradiation area. By adopting a configuration that fulfills a plurality of functions by the diffractive optical element, the optical system of the projector can be easily reduced in size and space, and can be made inexpensive. When a laser beam, which is coherent light, is irradiated onto a diffusion surface, an interference pattern called a speckle pattern in which bright spots and dark spots are randomly distributed may appear. The speckle pattern is generated when light diffused at each point on the diffusion surface interferes randomly. When a speckle pattern is recognized when an image is displayed, a glimmering flickering feeling is given to the observer, which adversely affects image viewing. For this reason, when using a laser light source, it is necessary to take measures against speckle noise. Regarding the reduction of speckle noise, for example, Patent Document 1 proposes a technique of superimposing a plurality of speckle patterns by rotating or vibrating a diffusion element. Patent Document 2 proposes a technique for superimposing a plurality of speckle patterns by sequentially making laser beams incident on a plurality of diffractive optical elements. Both techniques reduce speckle noise by superimposing a plurality of speckle patterns and making it difficult to recognize a specific speckle pattern.

Japanese Patent Laid-Open No. 6-208089 JP 2007-114358 A

  The technique of Patent Document 1 requires mechanical driving means for rotating or vibrating the diffusing element. If the driving means is necessary, the reliability of the apparatus may be lowered, the apparatus may be enlarged, and the quietness may be deteriorated. When the diffusing element is rotated or vibrated, high durability is required for the diffusing element, which increases the cost. The technique of Patent Document 2 uses a switching element that switches the optical path of laser light so that laser light is sequentially incident on a plurality of diffractive optical elements. As the switching element, a hologram structure having an optical functional layer is used. The optical functional layer is configured by alternately laminating a polymer portion having birefringence and a liquid crystal portion in which liquid crystal molecules are dispersed. When such a switching element is used, it is difficult to increase the deflection angle for deflecting the laser beam. The smaller the deflection angle of the laser beam, the smaller the number of diffractive optical elements on which the laser beam is incident. As the number of diffractive optical elements on which laser light is incident is smaller, the number of speckle patterns to be superimposed is also smaller, so it is difficult to reduce speckle noise. Thus, according to the prior art, there arises a problem that it is difficult to reduce speckle noise without using mechanical driving means. The present invention has been made in view of the above-described problems. An illumination device capable of effectively reducing speckle noise without using a mechanical driving unit, and a projector using the illumination device. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, an illumination device according to the present invention includes a light source unit that emits coherent light, a light deflection element that deflects coherent light emitted from the light source unit, and a light deflection element. A plurality of diffused illumination elements that diffuse the emitted coherent light and travel to the irradiated surface, and the light deflection element continuously has a deflection angle for deflecting the coherent light according to the electric field applied to the light deflection element. And a plurality of diffused illumination elements are provided at positions where coherent light deflected by the deflecting unit is incident.

  To change the deflection angle continuously means to change the deflection angle continuously so as to scan the coherent light. To change the deflection angle stepwise means to change the deflection angle discretely so that coherent light is incident on each target position. The illumination device can eliminate the need for mechanical driving means for reducing speckle noise by using an optical deflection element that changes the deflection angle in accordance with the electric field. By using an optical deflection element capable of deflecting coherent light with a large deflection angle, the optical deflection element can make coherent light incident on many diffuse illumination elements by adjusting an electric field. By making it possible to superimpose many speckle patterns, the lighting device can effectively reduce speckle noise. Thereby, the illuminating device which can reduce speckle noise without using a mechanical drive means can be obtained.

  As a preferred aspect of the present invention, it is desirable that the light deflection element has an electro-optic element. The electro-optic element has a property that the refractive index changes according to the applied electric field. Thereby, the deflection angle of coherent light can be changed according to the electric field applied to the optical deflection element.

Moreover, as a preferable aspect of the present invention, it is desirable that the deflecting unit has KTa 1-x Nb x O 3 (0 <x <1). KTa 1-x Nb x O 3 (hereinafter referred to as KTN as appropriate) has a property that the electro-optic effect is extremely large. Thereby, coherent light can be deflected with a large deflection angle.

  Moreover, as a preferable aspect of the present invention, it is desirable that the optical deflection element includes an acousto-optic element. The acoustooptic device is configured by combining an acoustooptic medium that is a deflection unit and a piezoelectric element that generates ultrasonic waves and sound waves. The acoustooptic device generates a dense wave in the acoustooptic medium using ultrasonic waves or sound waves generated by applying an electric field to the piezoelectric element, and diffracts light passing through the acoustooptic medium. Thereby, the deflection angle of coherent light can be changed according to the electric field applied to the optical deflection element.

  As a preferred embodiment of the present invention, the diffuse illumination element is preferably a diffractive optical element that diffracts coherent light. Thereby, coherent light can be diffused and advanced to the irradiated surface.

  As a preferred aspect of the present invention, it is desirable that the plurality of diffractive optical elements are arranged in parallel in a direction substantially the same as the direction in which the coherent light is deflected by the light polarizing element. Thereby, the coherent light deflected by the light deflection element can be made incident on each diffractive optical element.

  As a preferred aspect of the present invention, the plurality of diffractive optical elements are arranged in parallel in the first direction and in a second direction substantially orthogonal to the first direction, and the light deflection element includes the first direction and the first direction. It is desirable to deflect the coherent light in the direction of 2. Thereby, coherent light can be incident on many diffractive optical elements, and speckle noise can be effectively reduced.

  Furthermore, a projector according to the present invention includes the above-described illumination device and a spatial light modulation device that modulates light supplied from the illumination device in accordance with an image signal. By using the above illumination device, speckle noise can be reduced without using mechanical driving means. As a result, it is possible to obtain a projector capable of displaying a high-quality image with high silence and high reliability and reduced speckle noise.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a lighting apparatus 10 according to Embodiment 1 of the present invention. The laser light source 11 is a light source unit that emits laser light that is coherent light, and includes, for example, a semiconductor laser. The electro-optical element 12 functions as an optical deflection element that deflects the laser light emitted from the laser light source 11. The collimating lens 13 collimates the laser light beam emitted from the electro-optic element 12. The light diffracting unit 14 diffracts the laser light emitted from the collimating lens 13 and advances the diffracted light to the irradiated surface of the illumination target I. The light diffracting unit 14 shapes and enlarges the irradiation area and makes the light amount distribution in the irradiation area uniform. The illumination object I is, for example, a spatial light modulator.

  FIG. 2 shows a planar configuration of the light diffraction section 14. The light diffraction section 14 has a plurality of, for example, six diffractive optical elements 15. The diffractive optical element 15 is formed on the surface of the light diffracting unit 14, for example, the exit surface that emits laser light. The diffractive optical element 15 functions as a diffusion illumination element that diffuses the laser light emitted from the electro-optical element 12 by diffraction and advances it to the irradiated surface. The plurality of diffractive optical elements 15 are provided in parallel in the first direction. The first direction is a specific direction substantially orthogonal to the optical axis described later. In FIG. 2, the vertical direction parallel to the paper surface is defined as the first direction. As the diffractive optical element 15, for example, a computer generated hologram (CGH) can be used.

  FIG. 3 schematically shows a planar configuration of the diffractive optical element 15. 4 shows an AA cross-sectional configuration of FIG. The diffractive optical element 15 includes a plurality of irregularities formed with the rectangular region 16 as a unit. The unevenness has a rectangular shape in the cross section shown in FIG. In FIG. 3, each rectangular area 16 is filled or hatched to indicate that a height difference in a direction perpendicular to the paper surface is provided.

  The diffractive optical element 15 changes the phase of the laser beam for each rectangular region 16. The diffractive optical element 15 generates diffracted light by spatially changing the phase of the laser light. By optimizing the surface conditions including the pitch of the rectangular region 16 and the height of the unevenness, the diffractive optical element 15 can have a predetermined function. As a design method for optimizing the surface condition of the diffractive optical element 15, a predetermined calculation method (simulation method) such as an iterative Fourier transform can be used. The diffractive optical element 15 may have a configuration including irregularities that form a rectangular shape in cross section, or a configuration that includes irregularities that form a triangular shape in cross section.

  The optical diffraction part 14 can be manufactured using, for example, a so-called nanoimprint technique in which a mold having a desired shape is formed and then the shape of the mold is thermally transferred to the substrate. In addition, the light diffraction section 14 may be manufactured by another conventionally used method as long as a desired shape can be formed.

  FIG. 5 shows a schematic perspective configuration of the electro-optic element 12. The electro-optical element 12 includes a KTN crystal 20, a first electrode 21, and a second electrode 22. The KTN crystal 20 is a transparent crystal made of potassium (K), tantalum (Ta), niobium (Nb), and oxygen (O). The KTN crystal 20 functions as a deflection unit that continuously changes the deflection angle for deflecting the laser light in accordance with the electric field applied to the electro-optic element 12. The KTN crystal 20 has a cubic shape. The first electrode 21 is provided on one surface of the KTN crystal 20. The second electrode 22 is provided on the surface of the KTN crystal 20 opposite to the surface on which the first electrode 21 is provided. The first electrode 21 and the second electrode 22 are connected to a power source (not shown).

  FIG. 6 illustrates the deflection of laser light by the electro-optical element 12. The electro-optic element 12 has a property of changing the refractive index of the crystal according to the applied electric field. Such an electro-optic effect includes a primary electro-optic effect (Pockels effect) in which the change in refractive index is proportional to the applied electric field, and a secondary electro-optic effect (Kerr in which the change in refractive index is proportional to the square of the applied electric field. Effect). The KTN crystal 20 is known as an optical crystal having a very large secondary electro-optic effect. When the voltage applied between the first electrode 21 and the second electrode 22 is changed, the deflection angle for deflecting the laser light changes according to the electric field applied to the KTN crystal 20. The deflection angle is assumed to be an angle formed by an extension line (dashed line in the figure) of the chief ray of the laser light incident on the electro-optic element 12 and the chief ray of the laser beam emitted from the electro-optic element 12.

  It is assumed that the optical axis AX of the illumination device 10 is an axis that passes through the center of the irradiation area of the illumination object I and is perpendicular to the irradiated surface. For example, the electro-optical element 12 changes the deflection angle of the laser light about the optical axis AX. The deflection angle of the laser light changes in a range of, for example, ± 6 degrees around the optical axis AX when the counterclockwise direction in the drawing is represented as positive. The electro-optic element 12 deflects the laser light in the first direction.

  FIG. 7 explains the scanning of the laser light in the light diffraction section 14. The light diffracting section 14 is positioned so that the laser light deflected by the KTN crystal 20 enters each diffractive optical element 15. The electro-optic element 12 causes each diffractive optical element 15 to repeatedly scan the spot sp of the laser beam by continuously changing the deflection angle of the laser beam. Each diffractive optical element 15 is designed to form a certain irradiation region on the irradiated surface by diffusing the laser light incident from the electro-optical element 12. Here, the laser light incident on each diffractive optical element 15 from the electro-optical element 12 forms an irradiation region having a speckle pattern that differs according to the incident diffractive optical element 15 on the irradiated surface. Accordingly, the illumination device 10 can superimpose a plurality of speckle patterns on the irradiated surface by causing the laser light to enter each diffractive optical element 15.

  The illumination device 10 can eliminate the need for mechanical driving means by using the KTN crystal 20 that changes the deflection angle in accordance with the electric field. By using the KTN crystal 20 that can change the laser light with a large deflection angle, the electro-optical element 12 can make the laser light incident on many diffractive optical elements 15 by adjusting the electric field. By making it possible to superimpose many speckle patterns, the illumination device 10 can effectively reduce speckle noise. Thereby, there is an effect that speckle noise can be effectively reduced without using mechanical driving means.

  The illumination device 10 desirably switches the diffractive optical element 15 on which the laser light from the electro-optical element 12 is incident, for example, 60 times or more per second. Thereby, it is possible to change the speckle pattern more quickly than a human recognizes a specific speckle pattern, and speckle noise can be effectively reduced. The light diffracting unit 14 may be any unit having a plurality of diffractive optical elements 15 arranged in parallel in a specific direction, and is not limited to one having six diffractive optical elements 15.

  FIG. 8 shows a planar configuration of the light diffraction section 25 used in the illumination device according to the modification of the present embodiment. The light diffracting unit 25 has nine diffractive optical elements 15. The nine diffractive optical elements 15 are arranged in a matrix of three in the first direction and three in the second direction. The second direction is a direction substantially orthogonal to the optical axis and the first direction. In FIG. 8, a vertical direction parallel to the paper surface is a first direction, and a horizontal direction parallel to the paper surface is a second direction. The electro-optic element (not shown) has two KTN crystals 20 (see FIG. 6) superimposed on each other. The electro-optic element uses two KTN crystals 20 to deflect the laser light in the first direction and the second direction. By deflecting the laser light in the two-dimensional direction, the laser light can be incident on many diffractive optical elements 15 and effectively reducing speckle noise as compared with the case of deflecting the laser light in one direction. it can.

  In this modification, the electro-optical element discretely changes the deflection angle of the laser light so that the laser light is incident on each diffractive optical element 15. The electro-optic element changes the deflection angle for deflecting the laser light in a stepwise manner in accordance with the electric field applied to the electro-optic element. Also in this modification, speckle noise can be effectively reduced without using mechanical driving means. The light diffracting unit 25 may be any unit having a plurality of diffractive optical elements 15 arranged in parallel in the first direction and the second direction, and is not limited to having nine diffractive optical elements 15. The electro-optical element 12 that makes laser light incident on the plurality of diffractive optical elements 15 arranged in parallel in the first direction may also change the deflection angle stepwise. Further, the electro-optic element of this modification may be one that continuously changes the deflection angle.

The electro-optic element is not limited to having the KTN crystal 20. The electro-optic element may be an electro-optic crystal that can obtain an electro-optic effect. For example, an LN (LiNbO 3 ) crystal may be used as the electro-optic element. The laser light source 11 is not limited to the one provided with a semiconductor laser, and may be provided with a solid laser, a liquid laser, a gas laser, or the like. The illumination device 10 is not limited to the case where the laser light source 11 is used for the light source unit. The illuminating device 10 may be configured to use a solid light source such as a light emitting diode (LED) or a super luminescence diode (SLD) as the light source unit.

FIG. 9 illustrates an acoustic optical element (AOM) 30 in the illumination apparatus according to the second embodiment of the present invention. A duplicate description with the first embodiment will be omitted. The AOM 30 functions as an optical deflection element that deflects laser light emitted from the laser light source 11 (see FIG. 1). The AOM 30 includes an acousto-optic medium 31 and a piezoelectric element 32. As the acousto-optic medium 31, for example, a single crystal such as TeO 2 or PbMoO 4 that is an acousto-optic crystal can be used. The acousto-optic medium 31 functions as a deflection unit that changes the deflection angle for deflecting the laser light continuously or stepwise according to the electric field applied to the AOM 30. The acousto-optic medium 31 has a cubic shape.

  The piezoelectric element 32 is provided by being bonded to one surface of the acoustooptic medium 31. The piezoelectric element 32 expands and contracts by applying a voltage to generate ultrasonic waves and sound waves. Ultrasonic waves and sound waves from the piezoelectric element 32 generate a dense wave inside the acoustooptic medium 31. In the acousto-optic medium 31, a periodic change in the refractive index distribution occurs due to the dense waves generated inside. The AOM 30 diffracts the laser light incident on the acoustooptic medium 31 based on the refractive index distribution generated in the acoustooptic medium 31. The laser light is deflected by diffraction at the acoustooptic medium 31.

  The AOM 30 changes the deflection angle for deflecting the laser light by changing the frequency of the ultrasonic wave and the sound wave from the piezoelectric element 32. An extension line (dashed line in the figure) of the chief ray of the laser light incident on the AOM 30 coincides with the chief ray of zero-order light emitted from the AOM 30. The zero-order light is light that is not diffracted by the acoustooptic medium 31 and passes through the acoustooptic medium 31 as it is. The illumination device of the present embodiment may be provided with a light absorption unit that absorbs zero-order light emitted from the AOM 30. By using the light absorbing portion, generation of stray light can be reduced.

  The lighting device according to the present embodiment can eliminate the need for mechanical driving means by using the AOM 30. Also in the case of the present embodiment, speckle noise can be effectively reduced without using mechanical driving means.

  FIG. 10 shows a schematic configuration of a projector 40 according to the third embodiment of the invention. The projector 40 is a front projection type projector that views light by projecting light onto the screen 47 and observing light reflected by the screen 47. The projector 40 includes a red (R) light illumination device 41R, a green (G) light illumination device 41G, and a blue (B) light illumination device 41B. The projector 40 is an image display device that displays an image using light from each color light illumination device 41R, 41G, 41B.

  Each of the color light illumination devices 41R, 41G, and 41B is an illumination device having the same configuration as the illumination device 10 of the first embodiment. The R light illumination device 41R includes an R light source unit 11R. The light source unit 11R for R light is a light source unit that emits laser light that is R light. The R light from the R light illumination device 41R is incident on the irradiated surface of the R light spatial light modulation device 42R. The R light spatial light modulation device 42R is a spatial light modulation device that modulates the R light from the R light illumination device 41R according to an image signal. The light modulated by the spatial light modulator for R light 42 </ b> R enters the cross dichroic prism 43.

  The G light illumination device 41G includes a G light source 11G. The G light source unit 11G is a light source unit that emits laser light that is G light. The G light from the G light illumination device 41G is incident on the irradiated surface of the G light spatial light modulation device 42G. The G light spatial light modulator 42G is a spatial light modulator that modulates the G light from the G light illumination device 41G in accordance with an image signal. The light modulated by the G light spatial light modulator 42G is incident on a surface of the cross dichroic prism 43 that is different from the surface on which the R light is incident.

  The B light illumination device 41B includes a B light source 11B. The light source unit 11B for B light is a light source unit that emits laser light that is B light. The B light from the B light illumination device 41B is incident on the B light spatial light modulation device 42B. The B light spatial light modulation device 42B is a spatial light modulation device that modulates the B light from the B light illumination device 41B in accordance with an image signal. The light modulated by the B spatial light modulator 42B is incident on a surface of the cross dichroic prism 43 that is different from the surface on which the R light is incident and the surface on which the G light is incident. Each of the color light spatial light modulators 42R, 42G, and 42B is a transmissive liquid crystal display device. As the transmissive liquid crystal display device, for example, a high temperature polysilicon TFT liquid crystal panel (HTPS) can be used.

  The cross dichroic prism 43 has two dichroic films 44 and 45 arranged substantially orthogonal to each other. The first dichroic film 44 reflects R light and transmits G light and B light. The second dichroic film 45 reflects B light and transmits R light and G light. The cross dichroic prism 43 combines the R light, G light, and B light incident from different directions and emits the light toward the projection lens 46. The projection lens 46 projects the light combined by the cross dichroic prism 43 toward the screen 47.

  By using the color light illumination devices 41R, 41G, and 41B having the same configuration as that of the illumination device 10 described above, speckle noise can be reduced without using mechanical drive means. Thereby, there is an effect that it is possible to display a high quality image having high silence and high reliability and reduced speckle noise.

  The projector 40 is not limited to the case where a transmissive liquid crystal display device is used as the spatial light modulation device. As the spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon; LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Valve), or the like may be used. The projector 40 is not limited to a configuration including a spatial light modulator for each color light. The projector 40 may be configured to modulate two or three or more color lights with a single spatial light modulator. The projector 40 is not limited to the case where a spatial light modulator is used. The projector 40 may be a slide projector that uses a slide having image information. The projector 40 may be a so-called rear projector that supplies light to one surface of the screen and observes an image by observing light emitted from the other surface of the screen. The illumination device according to the present invention is not limited to being applied to an image display device. The illumination device according to the present invention may be applied to, for example, a monitor device that captures an image of a subject to which illumination light is supplied.

  As described above, the illumination device according to the present invention is suitable for use in a projector.

The figure which shows schematic structure of the illuminating device which concerns on Example 1 of this invention. The figure which shows the planar structure of an optical diffraction part. The figure which represented typically the plane structure of the diffractive optical element. The figure which shows the AA cross-section structure of FIG. FIG. 2 is a diagram illustrating a schematic perspective configuration of an electro-optic element. 6A and 6B illustrate laser beam deflection by an electro-optic element. The figure explaining the scanning of the laser beam in an optical diffraction part. The figure which shows the planar structure of the optical diffraction part used for the illuminating device which concerns on a modification. The figure which shows AOM among the illuminating devices which concern on Example 2 of this invention. FIG. 6 is a diagram illustrating a schematic configuration of a projector according to a third embodiment of the invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Illuminating device, 11 Laser light source, 12 Electro-optical element, 13 Parallelizing lens, 14 Light diffraction part, I Illumination target object, 15 Diffractive optical element, 16 Rectangular area, 20 KTN crystal, 21 1st electrode, 22 2nd electrode , AX optical axis, 25 light diffraction section, 30 AOM, 31 acousto-optic medium, 32 piezoelectric element, 40 projector, 41RR light illumination device, 41GG light illumination device, 41BB light illumination device, 11RR light use Light source part, 11G G light source part, 11B B light source part, 42R R light spatial light modulator, 42G G light spatial light modulator, 42B B light spatial light modulator, 43 Cross dichroic prism, 44 First dichroic film, 45 Second dichroic film, 46 projection lens, 47 screen

Claims (8)

  1. A light source that emits coherent light;
    An optical deflection element for deflecting the coherent light emitted from the light source unit;
    A plurality of diffuse illumination elements for diffusing the coherent light emitted from the light deflection element and advancing to the irradiated surface;
    The optical deflection element has a deflection unit that changes a deflection angle for deflecting the coherent light continuously or stepwise according to an electric field applied to the optical deflection element,
    A plurality of the diffuse illumination elements are provided at a position where the coherent light deflected by the deflecting unit is incident.
  2.   The illumination device according to claim 1, wherein the light deflection element includes an electro-optic element.
  3. The lighting device according to claim 2, wherein the deflecting unit includes KTa 1-x Nb x O 3 (0 <x <1).
  4.   The illumination device according to claim 1, wherein the light deflection element includes an acousto-optic element.
  5.   The illumination apparatus according to claim 1, wherein the diffuse illumination element is a diffractive optical element that diffracts the coherent light.
  6.   6. The illumination device according to claim 5, wherein the plurality of diffractive optical elements are arranged in parallel in a direction substantially the same as a direction in which the coherent light is deflected by the light polarizing element.
  7. The plurality of diffractive optical elements are arranged in parallel in a first direction and a second direction substantially orthogonal to the first direction,
    The lighting device according to claim 6, wherein the light deflection element deflects the coherent light in the first direction and the second direction.
  8. The lighting device according to any one of claims 1 to 7,
    And a spatial light modulation device that modulates light supplied from the illumination device in accordance with an image signal.
JP2008024958A 2008-02-05 2008-02-05 Illumination device and projector Withdrawn JP2009186647A (en)

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