JP2007010972A - Illuminator and projection type image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminator capable of improving the efficiency of taking in light rays emitted from a light source and lowering the dispersion angle of the light rays, and to provide a projection type image display apparatus using the illuminator. <P>SOLUTION: The illuminator 100A has two light sources 1. Each light source 1 includes a light emitting diode 11 emitting white light, and an angle control lens 12. The angle control lens 12 reduces the dispersion angle of light emitted from the light emitting diode 11. An auxiliary integrator 2 is disposed on the light emission face side of the angle control lens 12. The auxiliary integrator 2 is a transparent member having a shape obtained by dividing a cylinder into four by two planes that pass the center of the cylinder and are perpendicular to each other. The auxiliary integrator 2 has a rectangular flat face serving as a light incident face, a recessed curved face serving as a reflecting face, and a rectangular flat face serving as a light emission face. The entire flat face, or light emission face, of each auxiliary integrator 2 faces the light incident face of the rod integrator 3 so as to be parallel to it. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination device and a projection display apparatus.

In recent years, it has been attempted to use a light emitting diode (LED) as a light source (see Patent Document 1). FIG. 15 shows a conventional lighting device 500A. The illumination device 500A includes two light emitting diodes 501 and a rod integrator 502. The principal ray axis of each light emitting diode 501 is disposed so as to be orthogonal to the light incident surface of the rod integrator 502. FIG. 16 shows a conventional lighting device 500B. The illumination device 500B includes two light emitting diodes 501, a rod integrator 502, and a triangular mirror 503. The principal ray axis of each light emitting diode 501 is arranged to be parallel to the light incident surface of the rod integrator 502. Each mirror surface of the triangular mirror 503 is disposed at an angle of 45 ° with respect to the principal ray axis of each light emitting diode 501 and the light incident surface of the rod integrator 502.
JP 2002-189263 A

  However, in any of the above-described configurations, not all of each is guided to the light incident surface of the rod integrator 502, so that the light capturing efficiency into the rod per unit light source is low. Further, since the light emitted from each light emitting diode 501 becomes light omnidirectionally emitted, even if the light dispersion is reduced by using the taper type rod integrator 502, such conventional illumination is used. When the apparatus is used for a projection display apparatus, the light utilization efficiency in the projection optical system is lowered. Also, if the area of the light incident surface of the rod integrator 502 is increased to increase the light capturing efficiency, the rod integrator 502 cannot be enlarged or a sufficient taper angle cannot be provided, and a low dispersion angle can be achieved. It happens that it cannot be planned.

  In view of the above circumstances, an object of the present invention is to provide an illumination device capable of improving the efficiency of capturing light emitted from a light source and reducing the dispersion angle of light, and a projection image display device using the illumination device. To do.

  In order to solve the above problems, the illumination device of the present invention includes a rod integrator that superimposes light taken from a light incident surface and emits the light from the light output surface, and a principal ray axis is parallel to the light incident surface or A plurality of light sources arranged obliquely, a dispersion angle control means provided for each light source and reflecting the light emitted from each light source so that the dispersion angle is small, and the light incident as seen from each light source An auxiliary integrator having a concave curved reflection surface when viewed from the surface, and reflecting the light from the dispersion angle control means to the light incident surface of the rod integrator by reflecting the light from the concave curved reflection surface. It is characterized by that.

  If it is said structure, even if it is the light (Lambertian light) omnidirectionally radiated | emitted by the light radiate | emitted from each light source, almost all of this light will be rod by the said dispersion angle control means and an auxiliary integrator. Since the light is guided into the integrator, the efficiency of taking the light emitted from the light source into the rod integrator is improved. In addition, since light is reflected on the reflection surface of the auxiliary integrator and guided into the rod integrator, an auxiliary light integration effect is obtained, and the reflection surface has a concave curved surface shape, so that the light has a low dispersion angle. (On the planar reflecting surface, the dispersion angle distribution of the light emitted from the light source is maintained as it is, and the effect of reducing the light dispersion angle cannot be obtained).

  In the above configuration, the rod integrator may have a tapered shape whose light exit surface is larger than its light incident surface. In these configurations, the light emitting surface of the auxiliary integrator may be smaller than the area of the light incident surface.

  In these configurations, a concave curved reflecting surface of the auxiliary integrator is provided between a surface parallel to the light incident surface of the rod integrator and a surface parallel to the surface and in contact with the edge of the dispersion angle control means. And a reflecting surface may be formed on the light incident surface of the auxiliary integrator at a position corresponding to the portion. In this configuration, the reflecting surface formed on the light incident surface of the auxiliary integrator may have an inclination that spreads with respect to the light incident direction of the rod integrator.

  In these configurations, a polarization conversion device that aligns the polarization direction of light may be provided on the light exit side of the rod integrator. Alternatively, in these configurations, a polarization conversion device that aligns the polarization direction of light may be provided on the light incident side of the rod integrator. In these configurations (except for the configuration in which the polarization conversion device is provided on the light incident side of the rod integrator), the rod integrator and the auxiliary integrator may be integrally formed.

  In these configurations, the auxiliary integrator is formed of a transparent member, and the light incident surface functions as a total reflection surface by interposing a layer having a lower refractive index than the transparent member on the light incident surface side of the auxiliary integrator. You may make it have.

  In these configurations (except for the configuration including the polarization conversion device), the rod integrator, the auxiliary integrator, and the dispersion angle control means may be integrally formed.

  In these configurations, the plurality of light sources may be color light sources that emit color light of one color (hereinafter referred to as a first configuration in this section). Alternatively, in these configurations, the plurality of light sources may be white light sources that emit white light (hereinafter referred to as a second configuration in this section). Alternatively, in these configurations, the plurality of light sources may be a color light source that emits first color light, a color light source that emits second color light, and a color light source that emits third color light (hereinafter referred to as a third light source in this section). Called composition).

  In addition, the illumination device includes a first configuration illumination device that emits first color light, a first configuration illumination device that emits second color light, a first configuration illumination device that emits third color light, And an optical member that guides each color light from the illumination device in substantially the same direction (hereinafter referred to as a fourth configuration in this section).

  In the third configuration or the fourth configuration, the first color light may be red, the second color light may be blue, and the third color light may be green (hereinafter referred to as a fifth configuration in this section). The illumination device having the fifth configuration may be configured such that red light, blue light, and green light are always emitted during illumination (hereinafter, referred to as a sixth configuration in this section). Alternatively, in the fifth configuration, red light, blue light, and green light may be emitted in a time-division manner during illumination (hereinafter referred to as the seventh configuration in this section).

  According to another aspect of the present invention, there is provided a projection-type image display apparatus having a first configuration that emits red light, a first configuration that emits blue light, and a first configuration that emits green light. And a light valve for each color light provided so as to receive each color light from each illumination device, and a projection means for synthesizing and projecting each color image light passing through each light valve.

  According to another aspect of the present invention, there is provided a projection-type image display apparatus that projects the image light obtained by passing through the illumination device having the second configuration or the sixth configuration, one full-color light valve, and the full-color light valve. Means.

  According to another aspect of the present invention, there is provided a projection display apparatus comprising: the illumination device having the second configuration or the sixth configuration; and a separating unit that separates white light emitted from the illumination device into red light, green light, and blue light. And a light valve provided so as to receive each color light, and a projection unit that synthesizes and projects each color image light passing through each light valve.

  Further, the projection display apparatus of the present invention comprises a lighting device of the seventh configuration, one light valve, means for supplying a video signal for each color to the light valve in synchronization with the emission timing of each color light, And projection means for projecting image light obtained by passing through the light valve.

  According to the present invention, it is possible to improve the efficiency of capturing light emitted from the light source and reduce the light dispersion angle.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is an explanatory view showing a projection display apparatus using the illumination device 100A. This projection display apparatus uses three reflective display elements. White light emitted from the illumination device 100 </ b> A is guided to a total internal reflection (TIR) prism 30 through a lens 23. The white light reflected by the internal total reflection prism 30 is guided to a color separation / combination prism 31 composed of three prisms. Then, each color light is guided to DMD (digital micromirror device) 9R, 9G, 9B for each color, and these reflected lights (each color video light) are incident on the color separation / combination prism 31 again to become full color video light. The light is emitted from the color separation / combination prism 31. The full-color image light emitted from the color separation / combination prism 31 passes through the internal total reflection prism 30 and is enlarged and projected by the projection lens 5.

  Note that the illumination device 100A can also be used in a liquid crystal projector using a liquid crystal display panel. In a liquid crystal projector, it is desirable to align the polarization direction of light guided to the liquid crystal display panel. A configuration capable of aligning the polarization direction of light will be described later. When using the illumination device 100A that emits white light, a single-plate liquid crystal display panel type or a three-plate type (including a color film) (each dichroic mirror or the like separates each color light into each color light liquid crystal display panel). A liquid crystal projector in which each color modulated light is synthesized by a dichroic prism or the like can be configured. These configurations will be described later.

  FIG. 2 is a perspective view showing the illumination device 100A. The illumination device 100A includes two light sources 1. Each light source 1 includes a light emitting diode (LED) 11 that emits white light and an angle control lens (dispersion angle control means) 12. The angle control lens 12 is made of a transparent member having a rotationally symmetric substantially hemispherical shape, and has a flat circular light emitting surface and a hemispherical surrounding reflecting surface. The light emitting diode 11 is provided with a hemispherical lens cover. The light emitting diode 11 is mounted in a hemispherical recess formed at the rear end of the angle control lens 12. Of the light emitted from the light emitting diode 11, the light reflected by the surrounding reflection surface is a direction planned in the light emission angle control (a direction that is as parallel as possible to the principal ray axis of the light emitting diode 11. ). The light emitting diode 11 is an astigmatic light source, and even if the angle control lens 12 is provided, the light emitted from the light emitting diode 11 cannot be collimated, for example, and the dispersion angle of the light emitted from the light emitting diode 11 is changed. It can only be controlled (reduced) to some extent.

  An auxiliary integrator 2 is provided on the light exit surface side of the angle control lens 12. The auxiliary integrator 2 is a transparent member having a shape obtained by, for example, dividing the cylinder into four on two orthogonal planes passing through the center of the cylinder, and a rectangular plane serving as a light incident surface and a concave curved surface serving as a reflecting surface. It has a quadrangular plane that serves as a light exit surface. Reflection efficiency can be increased by depositing, for example, metal on the concave curved surface serving as the reflection surface. The rectangular plane serving as the light incident surface faces parallel to the circular light exit surface of the angle control lens 12. A region other than the facing portion (outside of the circle) is a reflecting surface. Then, the entire plane serving as the light emitting surface faces the light incident surface of the rod integrator 3 in parallel. The concave curved surface serving as the reflective surface is a concave curved surface as viewed from each light source 1 and from the light incident surface of the rod integrator 3. A transparent adhesive (its refractive index should be the same as the refractive indexes of the angle control lens 12 and the rod integrator 3) is interposed between the plane that becomes the light emitting surface and the light incident surface of the rod integrator 3. You may let them.

  The rod integrator 3 is made of, for example, a quadrangular prism-shaped transparent glass. In the illumination device 100 </ b> A, a non-tapered rod integrator is used as the rod integrator 3. The aspect ratio of the light exit surface of the rod integrator 3 is preferably substantially the same as the aspect ratio of the object to be illuminated (video display panel).

  Light emitted from the light emitting diode 11 (light emitted in all directions: Lambertian light) is guided to the auxiliary integrator 2 with a dispersion angle reduced by the angle control lens 12. The light guided into the auxiliary integrator 2 is reflected by the concave curved reflecting surface of the auxiliary integrator 2 and guided into the rod integrator 3. Here, when the reflection surface is not a concave curved surface but a flat surface, the light emitted from the angle control lens 12, that is, the light having a certain dispersion angle distribution, is sent to the rod integrator 3 as it is. It will be guided. On the other hand, when the reflecting surface has a concave curved surface shape, the dispersion angle of the light emitted from the angle control lens 12 is further narrowed (the dispersion angle based on the axis orthogonal to the light incident surface of the rod integrator 3 is small). In addition, an auxiliary optical integration effect is generated and guided to the rod integrator 3.

  In the illumination device 100A, the angle control lens 12 and the auxiliary integrator 2 are both made of a transparent member and arranged so as to be separated from each other (having an air gap). For this reason, the light incident surface of the auxiliary integrator 2 can function as a total reflection surface, and the light reflected by the concave curved reflection surface of the auxiliary integrator 2 and returning to the light incident surface is totally reflected on the light incident surface. Since it can be guided to the rod integrator 3 by the reflection function, the light utilization efficiency is improved. The angle control lens 12 and the auxiliary integrator 2 may be connected via a low refractive index layer, not limited to the air gap.

  In the illumination device 100A, an arrangement form in which the two light sources 1 and 1 face each other (an arrangement form in which each principal ray axis coincides) is adopted, but the present invention is not limited to this. For example, the illuminating device 100B shown in FIG. 3 has an arrangement configuration in which the principal ray axes of the two light sources 1 and 1 cross. Further, the rod integrator 3 ′ in the lighting device 100B has a structure in which two prismatic parts 3a and 3b are joined with a transparent adhesive (having the same refractive index as that of the parts). Such a part structure can also be employed in the lighting device 100A. Moreover, the illuminating device which has the four light sources 1 can be obtained by using 2 sets of illuminating devices 100A and 100B of illuminating devices. When four light sources are provided, one can be a red light emitting diode, one can be a blue light emitting diode, and the other two can be green light emitting diodes, thereby obtaining white light.

  4A, 4B, and 4C are explanatory views illustrating the direction of the light source when two light sources are employed. FIGS. 5A, 5 </ b> B, 5 </ b> C, and 5 </ b> D are explanatory diagrams illustrating directions of light sources when four light sources are employed. In the figure, “→” indicates the traveling direction of the light emitted from the light source.

  FIG. 6 shows a configuration in which the auxiliary integrator 2 and the rod integrator 3 are integrated. One auxiliary integrator 2 and one prismatic part may be integrated, and these integrated members may be joined with a transparent adhesive (see the dotted line in FIG. 6).

  FIG. 7 shows a configuration in which the angle control lens 12, the auxiliary integrator 2, and the rod integrator 3 are integrated. One angle control lens 12 and one auxiliary integrator 2 and one prismatic part may be integrated, and these integrated members may be joined together with a transparent adhesive (see dotted lines in FIG. 7).

  By combining such integrated members, a four-light source type can be realized. In addition, such an integrated configuration can be manufactured relatively easily when a transparent resin is used. One optical member having a plurality of auxiliary integrator sections may be produced, or a plurality of auxiliary integrators may be bonded to form one optical member.

  FIG. 8 shows an illumination device 100C. In this illuminating device 100C, the reflective surface (concave surface) of the auxiliary integrator 2 is disposed between a surface parallel to the light incident surface of the rod integrator 3 and a surface parallel to the surface and in contact with the edge of the angle control lens 12. ) Is part of it. Here, in the illuminating device 100A and the illuminating device 100B, the light is reflected at the edge of the angle control lens 12 and is in the vicinity of the edge of the curved reflecting surface of the auxiliary integrator 2 (both edges are close to the light incident surface of the rod integrator 3). May return to the angle control lens 12 again. On the other hand, in the case of the illumination device 100C, the light returning toward the angle control lens 12 is reflected on the reflecting surface of the auxiliary integrator 2 (the reflecting surface (curved surface) of the auxiliary integrator 2 among the reflecting surfaces of the circular outer region described above). It reaches a region facing a part (reference symbol A is added to this reflection region), is reflected by this reflection surface, and is guided to the rod integrator 3.

  FIG. 9 shows an illumination device 100C ′. The illumination device 100C ′ is obtained by inclining the reflection area A in the illumination device 100C. The direction of the inclination is a direction spreading with respect to the light incident direction to the rod integrator 3. The inclined reflection region A reduces the dispersion angle of the light reflected to the reflection region A and guided to the rod integrator 3 (the dispersion angle with respect to the axis orthogonal to the light incident surface of the rod integrator 3 is reduced). ). When a taper type (the light exit surface is larger than the light incident surface) is used as the rod integrator 3, the rod integrator 3 may have a tapered shape indicated by a dotted line in FIG.

  FIG. 10 shows an illumination device 100D. The auxiliary integrator 2 in the other illumination device described above is a transparent member having a shape obtained by dividing the cylinder into four parts on two orthogonal planes passing through the center of the cylinder. On the other hand, the auxiliary integrator 2A in the illumination device 100D is a transparent member having a shape obtained by dividing the cylinder into four on two non-orthogonal planes passing through the center of the cylinder. The square plane serving as the light incident surface and the square plane serving as the light exit surface intersect at an angle of less than 90 °. It should be noted that the square plane serving as the light incident surface and the square plane serving as the light exit surface may intersect at an angle exceeding 90 °. The rod integrator 3 may be a non-tapered type, or may be a tapered type as indicated by a dotted line in FIG. In the configuration shown in FIG. 10, the dotted line is located on an extension line of the light incident surface of the auxiliary integrator 2A.

  FIG. 11 shows an illumination device 100E. The auxiliary integrator 2 in the other illumination device described above is a transparent member having a shape obtained by dividing the cylinder into four parts on two orthogonal planes passing through the center of the cylinder. On the other hand, the auxiliary integrator 2B in the illumination device 100E is a transparent member having a shape obtained by dividing the cylinder into four parts on two orthogonal planes passing through the center of the elliptic cylinder. Since the area of the square plane serving as the light exit surface is smaller than the area of the square plane serving as the light entrance surface, the area of the light entrance surface of the rod integrator 3 can be reduced, This is convenient for providing a tapered shape. Alternatively, in the case of using the polarization converters 5 and 6 described later, it is possible to reduce the area of the final light exit surface.

  A transparent member having a shape obtained by dividing the cylinder into four parts on two non-orthogonal planes passing through the center of the elliptic cylinder can also be adopted. The concave curved surface shape of the auxiliary integrator is not limited to a shape obtained by dividing such a circular cylinder or elliptic cylinder into four, and other concave curved surface shapes (such as aspherical surfaces) can be adopted.

  FIG. 12 shows the lighting device 100F. The illumination device 100F includes a polarization conversion device 5 between the light exit surface of the auxiliary integrator 2B and the light entrance surface of the rod integrator 3. The polarization conversion device 5 is configured by a polarization beam splitter array (hereinafter referred to as a PBS array). Each polarization separation film in this PBS array passes, for example, P-polarized light out of the light from the light source 1, and changes the optical path of S-polarized light by 90 °. The S-polarized light whose optical path has been changed is reflected by an adjacent polarization separation film (or reflection film) and emitted as it is. On the other hand, the P-polarized light that has passed through the polarization separation film is converted into S-polarized light by a phase difference plate (1 / 2λ plate) 5a provided on the front side (light emission side) thereof and emitted. That is, in this case, almost all light is converted to S-polarized light. The polarizing beam splitter is configured by a so-called wire grid polarizing plate, a polarization separating multilayer film, or the like.

  FIG. 13 shows an illumination device 100G. This illumination device 100G includes a polarization conversion device 5 on the light exit surface side of the rod integrator 3. When the polarization conversion device 5 is provided in this way, the final light exit surface is twice as large as the light exit surface of the rod integrator 3. Since the rod integrator 3 of the illumination device 100G can be made thinner than the rod integrator 3 of the illumination device 100F, a higher light integration effect can be obtained.

  FIG. 14 is an explanatory view showing a three-plate type projection display apparatus. This projection display apparatus includes three illumination devices 100F. One of the three lighting devices 100F emits red light, the other emits green light, and the other emits blue light. That is, the illumination device 100 </ b> F includes a light source (LED) that emits the same color light as each light source 1. Each color light emitted from each illumination device 100F is guided to the liquid crystal display panels 6R, 6G, and 6B, respectively. The modulated light (each color video light) modulated by passing through the liquid crystal display panels 6R, 6G, 6B is synthesized by the cross dichroic prism 7 to become full color video light. The full-color image light is enlarged and projected by the projection lens 8 and displayed on the screen.

  It is also possible to adopt a configuration in which white light emitted from a lighting device (such as lighting device 100A) that emits white light is dispersed into each color light by a dichroic mirror or the like, and each color light is guided to a video display panel for each color light. The modulated light (each color video light) modulated by passing through the video display panel is combined by a cross dichroic prism to become full color video light. The full-color image light is enlarged and projected by the projection lens and displayed on the screen.

  It is also possible to configure a time-division full-color projection-type video display device using a single video display panel (liquid crystal display panel or DMD shown in FIG. 1) and a lighting device. For example, when a four-light source type lighting device is used and the light emitting diode 11 for red light among four light sources (R, G, G, B) is pulse-lit, the video display panel has a red light source. When the image signal is supplied and the light emitting diode for green light is pulsed, the image display is performed when the image signal for green is supplied to the image display panel and the light emitting diode for blue light is pulsed. A blue video signal is supplied to the panel. In other words, the video display panel can be time-divisionally driven in synchronization with the pulse lighting timing of each color light emitting diode.

  In addition, a lighting device that emits red light (for example, a red light emitting diode is used as the light emitting diode 11 in the lighting device 100A) and a lighting device that emits green light (for example, a green light emitting diode is used as the light emitting diode 11 in the lighting device 100A). Use) and a lighting device that emits blue light (for example, a blue light emitting diode is used as the light emitting diode 11 in the lighting device 100A), and each color light emitted from each lighting device is transmitted by a cross dichroic prism. They can be guided in substantially the same direction. Even in such a configuration, each lighting device can emit light in a time-sharing manner, and white light can be obtained by always lighting each lighting device.

  In the illumination device described above, the angle control lens 12 is hemispherical (having a circular light exit surface), but is not limited to this. For example, the light exit surface of the angle control lens 12 may be rectangular and may coincide with or substantially coincide with the square light incident surface of the auxiliary integrator 2. Further, although the hemispherical lens (having a semicircular cross section) is used as the angle control lens 12, an angle control lens having a non-semicircular cross section may be used. The solid-state light emitting element is not limited to a light emitting diode (LED), and organic / inorganic electroluminescence can be used. Further, although the angle control lens is used as the dispersion angle control means, a hollow structure (for example, a concave mirror) may be used. Moreover, although the thing which consists of a transparent member was used as the auxiliary | assistant integrator 2, you may employ | adopt a hollow member (inner surface is a mirror surface). The rod integrator 3 may also be a hollow member (inner surface is a mirror surface) instead of a transparent member.

It is explanatory drawing which showed the optical system of the projection type video display apparatus of embodiment of this invention. It is the perspective view which showed the illuminating device of FIG. It is the perspective view which showed the modification of the illuminating device. It is explanatory drawing which showed the example of arrangement | positioning of two light sources. It is explanatory drawing which showed the example of arrangement | positioning of four light sources. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the modification of the illuminating device. It is the perspective view which showed the other structural example of the projection type video display apparatus. It is sectional drawing which showed the conventional illuminating device. It is explanatory drawing which showed the conventional illuminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 11 Light emitting diode 12 Angle control lens (dispersion angle control means)
2 Auxiliary integrator 3 Rod integrator 100A, 100B, 100C, 100D, 100E
100F, 100G lighting device

Claims (21)

A rod integrator that superimposes light taken from the light incident surface and emits the light from the light output surface, a plurality of light sources with principal ray axes provided parallel or oblique to the light incident surface, and provided for each light source. A dispersion angle control means for reflecting the light emitted from each light source so that the dispersion angle is small; and a reflection surface having a concave curved surface when viewed from each light source and viewed from the light incident surface. An illuminating device comprising: an auxiliary integrator that reflects light from an angle control means on the concave curved reflecting surface and guides the light to a light incident surface of the rod integrator. The lighting device according to claim 1, wherein the rod integrator has a tapered shape having a light emission surface larger than a light incident surface thereof. 3. The illumination device according to claim 1, wherein a light exit surface of the auxiliary integrator is smaller than an area of the light entrance surface. 4. The illumination device according to claim 1, wherein a surface parallel to the light incident surface of the rod integrator and a surface parallel to the surface and in contact with an edge of the dispersion angle control means. A part of the concave curved reflecting surface of the auxiliary integrator exists in between, and a reflecting surface is formed on a light incident surface of the auxiliary integrator at a position corresponding to the part. apparatus. 5. The illuminating device according to claim 4, wherein the reflecting surface formed on the light incident surface of the auxiliary integrator has an inclination that spreads with respect to the light incident direction of the rod integrator. 6. The illuminating device according to claim 1, further comprising a polarization conversion device that aligns a polarization direction of light on a light exit side of the rod integrator. 6. The illuminating device according to claim 1, further comprising a polarization conversion device that aligns a polarization direction of light on a light incident side of the rod integrator. The lighting device according to claim 1, wherein the rod integrator and the auxiliary integrator are integrally formed. 9. The illumination device according to claim 1, wherein the auxiliary integrator is made of a transparent member, and a layer having a lower refractive index than the transparent member is interposed on the light incident surface side of the auxiliary integrator. And the said light-incidence surface has a function as a total reflection surface, The illuminating device characterized by the above-mentioned. 7. The lighting device according to claim 1, wherein the rod integrator, the auxiliary integrator, and the dispersion angle control unit are integrally formed. The lighting device according to any one of claims 1 to 10, wherein the plurality of light sources are color light sources that emit color light of one color. The lighting device according to any one of claims 1 to 10, wherein the plurality of light sources are white light sources that emit white light. 11. The lighting device according to claim 1, wherein the plurality of light sources are a color light source that emits first color light, a color light source that emits second color light, and a color light source that emits third color light. A lighting device characterized by that. The illumination device according to claim 11, which emits first color light, the illumination device according to claim 11, which emits second color light, the illumination device according to claim 11, which emits third color light, and each illumination An illumination device comprising: an optical member that guides each color light from the device in substantially the same direction. 15. The lighting device according to claim 13, wherein the first color light is red, the second color light is blue, and the third color light is green. 16. The illuminating device according to claim 15, wherein red light, blue light, and green light are always emitted during illumination. 16. The illumination device according to claim 15, wherein red light, blue light, and green light are emitted in a time division manner during illumination. The illumination device according to claim 11, which emits red light, the illumination device according to claim 11, which emits blue light, the illumination device according to claim 11, which emits green light, and each illumination device. A projection-type image display device comprising: a light valve for each color light provided so as to receive each color light; and a projection unit that synthesizes and projects each color image light that has passed through each light valve. 17. A projection, comprising: the illumination device according to claim 12; and a single full-color light valve; and projection means for projecting image light obtained through the full-color light valve. Type image display device. 17. The illumination device according to claim 12 or 16, a separation unit that separates white light emitted from the illumination device into red light, green light, and blue light, and a light that is provided to receive each color light. A projection-type image display apparatus comprising: a bulb; and a projection unit that synthesizes and projects each color image light that has passed through each light valve. An illumination device according to claim 17, one light valve, means for supplying a video signal for each color to the light valve in synchronization with the emission timing of each color light, and the light valve obtained And a projection means for projecting image light.

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