JP6947122B2 - Projector and multi-projection system - Google Patents

Description

The present invention relates to projectors and multi-projection systems.

The multi-projection system has multiple projectors. The multi-projection system displays a multi-projection image on a screen or the like by projecting a plurality of images side by side on a screen or the like by a plurality of projectors.

In the multi-projection system, each projected image is edge-blended in order to make the boundary between the projected images inconspicuous. The edge blending process is a process of adjusting the brightness of the projected image so that the overlapping area of the projected images does not become too bright when the adjacent images are projected by overlapping only a predetermined area.

Patent Document 1 describes an edge blending process for adjusting the brightness of a projected image so that the region of the projected image corresponding to the overlapping region of the projected images becomes continuously dark toward the edge.

The electrical edge blending process as described in Patent Document 1 is effective for a bright projected image, but secures a sufficient dynamic range for adjusting the brightness for a dark projected image. Can't. Therefore, in the electrical edge blending process, the overlapping region of the projected images becomes brighter for a dark projected image, which causes deterioration of the quality of the multi-projected image.

In Patent Document 2, a light-shielding plate is arranged between the projector and the screen, and the edge of the projected image is placed on the light-shielding plate to form a shadow, and the area of the projected image corresponding to the overlapping area of the projected images is at the end. An edge blending process that adjusts the brightness of the projected image so that it becomes darker continuously is described.

In the optical edge blending process as described in Patent Document 2, the brightness of the projected image region corresponding to the overlapping region of the projected images can be adjusted regardless of the brightness of the projected images.

Japanese Unexamined Patent Publication No. 2009-159372 Japanese Unexamined Patent Publication No. 3-53288

The projector may have multiple illumination sources. For example, a projector uses a blue laser light source and a phosphor as a plurality of illumination light sources. The blue laser light source emits blue laser light as blue illumination light. The phosphor converts the energy of the blue laser light emitted from the blue laser light source into the yellow illumination light in the wavelength band including the red band and the green band. The projector separates the yellow illumination light into red illumination light and green illumination light.

The projector photomodulates the red illumination light, the green illumination light, and the blue illumination light based on the image data of each color component to generate the red image light, the green image light, and the blue image light. The projector synthesizes red image light, green image light, and blue image light and projects them on a screen or the like. That is, the blue image light corresponding to the blue image projected on the screen or the like is generated by using the blue laser light source as the illumination light source. The red image, the red image light corresponding to the green image, and the green image light are generated by using a phosphor as an illumination light source.

The orientation distribution of the projected image is different from the blue image light using the blue laser light source as the illumination light source, the red image light using the phosphor as the illumination light source, and the green image light. In the optical edge blending process using a light-shielding plate, a color distribution occurs in the projected image region corresponding to the overlapping region of the projected images due to the difference in the orientation distribution, which causes deterioration of the quality of the multi-projected image. ..

An object of the present invention is to provide a projector and a multi-projection system capable of suppressing deterioration of the quality of a multi-projection image when the projector has a plurality of illumination light sources.

The present invention is a blue laser light source, and when either one of linearly polarized s-polarized light and p-polarized light is the first polarized light and the other is the second polarized light, the blue laser which is the first polarized light. A first illumination light source that emits light as the first illumination light, and a red band component and a green band that are phosphors and are generated by irradiating the phosphor with the first illumination light. A second illumination light source that emits yellow illumination light containing a component as a second illumination light, and arranged on the optical paths of the first and second illumination lights, reflect the first polarized light, and A first dichroic mirror having a specific polarized light reflection region that transmits the second polarized light and the second illumination light, and a transmission region that transmits the first and second illumination light, and the first dichroic. A retardation plate arranged on the optical path of the first and second illumination light transmitted through the mirror and converting the linearly polarized light into circularly polarized light, and the first and second illumination light transmitted through the retardation plate. disposed on the optical path, said first polarization and is transmitted through either of the polarization of the second polarization shifts the optical axis of the other side of the polarization, and the first and second illumination light Provided is a projector provided with a polarization conversion element that aligns the first polarized light or the second polarized light.

Further, the present invention includes a plurality of the projector for projecting an image and a light-shielding plate arranged corresponding to the projector so as to block a part of the image, and the plurality of projectors project the image. Provided is a multi-projection system for displaying a plurality of images to be displayed as a multi-projection image by superimposing some of the regions.

According to the projector and the multi-projection system of the present invention, when the projector has a plurality of illumination light sources, deterioration of the quality of the multi-projection image can be suppressed.

It is a block diagram which shows an example of the multi-projection system of 1st and 2nd Embodiment. It is a figure which shows the brightness of the projected image displayed on the screen. It is a figure which shows the brightness of the multi-projection image displayed on a screen. It is a block diagram which shows an example of the projector of 1st Embodiment. It is a block diagram which shows an example of the dichroic mirror in the projector of 1st Embodiment. It is a block diagram which shows an example of the dichroic mirror in the projector of 1st Embodiment. It is a figure which shows the distribution of the brightness of the red illumination light and the green illumination light. It is a figure which shows the distribution of the light intensity of the red illumination light and the green illumination light in A1-A1 shown in FIG. 5A. It is a figure which shows the distribution of the brightness of a blue illumination light. It is a figure which shows the distribution of the light intensity of the blue illumination light in A2-A2 shown in FIG. 6A. It is a figure which shows the distribution of the brightness of s-polarized light in blue illumination light. It is a figure which shows the distribution of the light intensity of the s-polarized light of the blue illumination light in A3-A3 shown in FIG. 7A. It is a figure which shows the distribution of the brightness of p-polarized light in blue illumination light. It is a figure which shows the distribution of the light intensity of the p-polarized light of the blue illumination light in A4-A4 shown in FIG. 8A. It is a figure which shows the distribution of the brightness of the red illumination light and the green illumination light. It is a figure which shows the distribution of the light intensity of the red illumination light and the green illumination light in A5-A5 shown in FIG. 9A. It is a figure which shows the distribution of the brightness of a blue illumination light. It is a figure which shows the distribution of the light intensity of the blue illumination light in A6-A6 shown in FIG. 10A. It is a figure which shows the distribution of the brightness of s-polarized light in blue illumination light. It is a figure which shows the distribution of the light intensity of the s-polarized light of the blue illumination light in A7-A7 shown in FIG. 11A. It is a figure which shows the distribution of the brightness of p-polarized light in blue illumination light. It is a figure which shows the distribution of the light intensity of the p-polarized light of the blue illumination light in A8-A8 shown in FIG. 12A. It is a block diagram which shows an example of a polarization conversion element. It is a figure which shows the distribution of the brightness of the red illumination light and the green illumination light. It is a figure which shows the distribution of the light intensity of the red illumination light and the green illumination light in A9-A9 shown in FIG. 14A. It is a figure which shows the distribution of the brightness of the blue illumination light in an illumination pupil. It is a figure which shows the distribution of the light intensity of the blue illumination light in A10-A10 shown in FIG. 15A. It is a figure which shows the distribution of the brightness of the blue illumination light in an illumination pupil. It is a figure which shows the distribution of the light intensity of the blue illumination light in A11-A11 shown in FIG. 16A. It is a figure which shows the distribution of the brightness of the blue illumination light in an illumination pupil. It is a figure which shows the distribution of the light intensity of the blue illumination light in A12-A12 shown in FIG. 17A. It is a block diagram which shows an example of the projector of 2nd Embodiment. It is a block diagram which shows an example of the dichroic mirror in the projector of 2nd Embodiment. It is a block diagram which shows an example of the dichroic mirror in the projector of 2nd Embodiment. It is a figure which shows the distribution of the brightness of the red illumination light and the green illumination light. It is a figure which shows the distribution of the light intensity of the red illumination light and the green illumination light in A21-A21 shown in FIG. 20A. It is a figure which shows the distribution of the brightness of a blue illumination light. It is a figure which shows the distribution of the light intensity of the blue illumination light in A22-A22 shown in FIG. 21A. It is a figure which shows the distribution of the brightness of s-polarized light in blue illumination light. It is a figure which shows the distribution of the light intensity of the s-polarized light of the blue illumination light in A23-A23 shown in FIG. 22A. It is a figure which shows the distribution of the brightness of p-polarized light in blue illumination light. It is a figure which shows the distribution of the light intensity of the p-polarized light of the blue illumination light in A24-A24 shown in FIG. 23A. It is a block diagram which shows an example of a polarization conversion element. It is a block diagram which shows an example of a polarization conversion element.

A configuration example of the multi-projection system will be described with reference to FIGS. 1, 2A, and 2B. As shown in FIG. 1, the multi-projection system 1 includes a plurality of projectors PJ and a plurality of light-shielding plates 10. The projector PJ projects the image IM onto the screen SRN. FIG. 1 shows a state in which two projectors PJ are arranged in the horizontal direction. In order to distinguish between the two projectors PJ, the projector PJ on the left side is referred to as the projector PJa, and the projector PJ on the right side is referred to as the projector PJb.

The shading plate 10 is arranged between the projector PJ and the screen SRN. The shading plate 10 is arranged for each projector PJ. The light-shielding plate 10 corresponding to the projector PJa is referred to as a light-shielding plate 10a, and the light-shielding plate 10 corresponding to the projector PJb is referred to as a light-shielding plate 10b.

In FIGS. 2A and 2B, the brightness of the projected image displayed on the screen SRN is shown by shading. Note that, in FIGS. 2A and 2B, only the projectors PJa and PJb and the screen SRN are shown in order to make the projected image easier to see.

As shown in FIG. 2A, the projector PJa projects the image IMa onto the screen SRN. As shown in FIG. 1, the light-shielding plate 10a is arranged corresponding to the projector PJa so as to block a part of the image IMa. Specifically, the light-shielding plate 10a is arranged so that the region on the right side of the image IMa covers the light-shielding plate 10a. Therefore, the projector PJa projects the shadow formed by the shading plate 10a on the screen SRN as a part of the image IMa.

In the image IMa projected on the screen SRN, the region of the light-shielding plate 10a corresponds to the shadow area of the light-shielding plate 10a. In the region on the right side of the image IMa, the degree of shading by the shading plate 10a increases toward the right end. Therefore, in the image IMa projected on the screen SRN, the degree of shadow by the shading plate 10a increases toward the right end. Therefore, in the image IMa projected on the screen SRN, the area IMRa on the right side is continuously darkened toward the right end. The image IMa projected on the screen SRN is defined as the projected image PIMA.

As shown in FIG. 2A, the projector PJb projects the image IMb onto the screen SRN. As shown in FIG. 1, the light-shielding plate 10b is arranged corresponding to the projector PJb so as to block a part of the image IMb. Specifically, the light-shielding plate 10b is arranged so that the region on the left side of the image IMb rests on the light-shielding plate 10b. Therefore, the projector PJb projects the shadow formed by the shading plate 10b onto the screen SRN as a part of the image IMb.

In the image IMb projected on the screen SRN, the region of the light-shielding plate 10b corresponds to the shadow area of the light-shielding plate 10b. In the region on the left side of the image IMb, the degree of shading by the shading plate 10b increases toward the left end. Therefore, in the image IMb projected on the screen SRN, the degree of shadow by the shading plate 10b increases toward the left end. Therefore, in the image IMb projected on the screen SRN, the left region IMRb becomes continuously dark toward the left end. The image IMb projected on the screen SRN is referred to as a projected image PIMb.

As shown in FIG. 1 or 2B, the projector PJa and the projector PJb display the image IMa and the image IMb on the screen SRN so that the region IMRa on the right side of the projected image PIMA and the region IMLb on the left side of the projected image PIMb overlap. Project to.

That is, in the multi-projection system 1, some regions that are shaded by the light-shielding plate 10 in the plurality of projected image PIMs, specifically, the region IMRa that covers the light-shielding plate 10a in the projected image PIMa and the light-shielding plate 10b in the projected image PIMb. The images IMa and IMb projected by the plurality of projectors PJa and PJb are displayed on the screen SRN as a multi-projection image MPIM so as to overlap with the region IMLb.

Therefore, the multi-projection system 1 is a multi-projection that is optically edge blended by the light-shielding plates 10a and 10b so that the brightness of the overlapping region of the projected image PIMA and the projected image PIMb becomes the same as the brightness of the other regions. The image MPIM can be displayed on the screen SRN.

[First Embodiment]
A configuration example of the projector PJ will be described with reference to FIG. The projector 100 of the first embodiment shown in FIG. 3 corresponds to the projectors PJ (PJa and PJb) shown in FIGS. 1, 2A, and 2B. The projector 100 includes a light source 101, a phosphor 102, a dichroic mirror 120, lenses 131 to 137, reflection mirrors 141 to 143, a retardation plate 103, and a polarization conversion element 150. In the first embodiment, the retardation plate 103 is used as the first retardation plate.

Further, the projector 100 includes dichroic mirrors 105 and 106, reflective polarizing plates 107R, 107G, and 107B, image display elements 108R, 108G, and 108B, a color synthesis prism 109, an aperture 110, and a projection lens 111. And. In the first embodiment, the dichroic mirror 120 is a first dichroic mirror, the dichroic mirror 105 is a second dichroic mirror, and the dichroic mirror 106 is a third dichroic mirror.

The light source 101 is a blue laser light source having an array structure in which a plurality of blue laser elements BL are arranged. The light source 101 emits blue laser light from each of the plurality of blue laser elements BL. The blue laser light is linearly polarized light of s-polarized light or p-polarized light. FIG. 3 shows a case where the blue laser light is s-polarized linearly polarized light. The blue laser light is applied to the dichroic mirror 120. In the first embodiment, the light source 101 is used as the first illumination light source, and the blue laser light is used as the first illumination light. Further, the s-polarized light is the first polarized light, and the p-polarized light is the second polarized light.

The dichroic mirror 120 is arranged so that the polarization direction of the blue laser light is s-polarized with respect to the dichroic mirror 120. The dichroic mirror 120 has an optical property of reflecting s-polarized light with respect to blue laser light and transmitting p-polarized light. The lens 131 is, for example, a condenser lens. The blue laser light emitted from the light source 101 is reflected by the dichroic mirror 120, further condensed by the lens 131, and irradiated to the phosphor 102.

The phosphor 102 has a fluorescent layer and a reflecting surface. The fluorescent layer is a yellow illumination light containing a red band component and a green band component having an intensity corresponding to the energy intensity of the light emitted from the light source 101, specifically, the blue laser light emitted from the light source 101. To generate. The reflecting surface reflects the blue laser light transmitted through the fluorescent layer and the yellow illumination light generated by the fluorescent layer.

In the first embodiment, the phosphor 102 is used as the second illumination light source, and the yellow illumination light is used as the second illumination light. Therefore, the projector 100 has a light source 101 (blue laser element BL) which is a first illumination light source and a phosphor 102 which is a second illumination light source as a plurality of illumination light sources.

The yellow illumination light, which is the fluorescence generated by the phosphor 102, is applied to the dichroic mirror 120 via the lens 131. A part of the blue laser light is diffused by the phosphor 102 to become random polarized light in which a plurality of polarized lights are mixed, and is irradiated to the dichroic mirror 120 via the lens 131. That is, the dichroic mirror 120 is arranged on the optical path of the blue laser light and the yellow illumination light. The dichroic mirror 120 has an optical property of transmitting yellow illumination light.

FIG. 4A shows a configuration example of the dichroic mirror 120. FIG. 4A shows a state in which the dichroic mirror 120 is viewed from the side opposite to the light source 101, that is, a state in which the dichroic mirror 120 is viewed from below in FIG. The dichroic mirror 120 has a specific polarized light reflection region 120R and a transmission region 120T.

The specific polarized light reflection region 120R reflects the s-polarized light in the blue laser light and transmits the p-polarized light in the blue laser light and the yellow illumination light. The transmission region 120T transmits all the polarized light including the s-polarized light and the p-polarized light in the blue laser light and the yellow illumination light.

The specific polarization reflection region 120R is arranged on the optical axis BLA of the blue laser element BL. The specific polarized light reflection region 120R is formed so as to have an area larger than the luminous flux width of the blue laser light. Therefore, all the blue laser light emitted from the plurality of blue laser elements BL is reflected toward the lens 131 by the dichroic mirror 120. Further, the blue laser light is focused by the lens 131 and irradiated to the phosphor 102.

The specific polarized light reflection region 120R is formed so as to have an area smaller than the luminous flux width of the diffused light emitted from the phosphor 102 through the lens 131. Of the blue laser light emitted from the phosphor 102 to the specific polarization reflection region 120R, the p-polarized light component passes through the specific polarization reflection region 120R, and the s-polarized light component is reflected by the specific polarization reflection region 120R and returned to the light source 101. .. The blue laser light emitted from the phosphor 102 to the transmission region 120T passes through the transmission region 120T. The blue laser light transmitted through the dichroic mirror 120 is defined as the blue illumination light.

The yellow illumination light emitted from the phosphor 102 through the lens 131 to the dichroic mirror 120 passes through the specific polarized light reflection region 120R and the transmission region 120T. As shown in FIG. 4B, the dichroic mirror 120 may be configured such that the specific polarization reflection region 120R is arranged on the optical axis BLA of the blue laser element BL, and the region other than the specific polarization reflection region 120R is the transmission region 120T. ..

The dichroic mirror 120 can be manufactured by forming, for example, a dielectric multilayer film in a predetermined region of a transparent material such as a glass plate or a prism. The region where the dielectric multilayer film is formed is the specific polarization reflection region 120R. The optical characteristics of the specific polarization reflection region 120R can be set according to the material and film thickness of the dielectric constituting the dielectric multilayer film.

Using FIGS. 5A, 5B, 6A, 6B, 7A, 7B, 8A, and 8B, blue illumination at position Pa where the blue illumination light and the yellow illumination light have passed through the dichroic mirror 120. The distribution of brightness between the red illumination light and the green illumination light included in the light and the yellow illumination light will be described. 5A, 5B, 6A, 6B, 7A, 7B, 8A, and 8B show the case where the dichroic mirror 120 has the shape shown in FIG. 4A.

FIG. 5A shows the distribution of the brightness of the red illumination light and the green illumination light included in the yellow illumination light at the position Pa in shades of light. FIG. 5B shows the distribution of the brightness of the red illumination light and the green illumination light in A1-A1 shown in FIG. 5A as the light intensity distribution. The red illumination light is composed of the red band component contained in the yellow illumination light, and the green illumination light is composed of the green band component contained in the yellow illumination light.

The yellow illumination light passes through the specific polarized light reflection region 120R and the transmission region 120T of the dichroic mirror 120. Therefore, at the position Pa, as shown in FIG. 5A or FIG. 5B, the distribution of the brightness (light intensity) of the red illumination light and the green illumination light is uniform. Let BR1 be the light intensity of the red illumination light and the green illumination light at the position Pa.

FIG. 6A corresponds to FIG. 5A and shows the distribution of the brightness of the blue illumination light in shades. FIG. 6B shows the distribution of the brightness of the blue illumination light in A2-A2 shown in FIG. 6A as the distribution of the light intensity. FIG. 7A corresponds to FIG. 6A and shows the distribution of the brightness of s-polarized light in the blue illumination light in shades of light. FIG. 7B shows the distribution of the brightness of the s-polarized light of the blue illumination light in A3-A3 shown in FIG. 7A as the distribution of the light intensity. FIG. 8A corresponds to FIG. 6A and shows the distribution of the brightness of p-polarized light in the blue illumination light in shades of light. FIG. 8B shows the distribution of the brightness of the p-polarized light of the blue illumination light in A4-A4 shown in FIG. 8A as the distribution of the light intensity.

The s-polarized light in the blue illumination light passes through the transmission region 120T of the dichroic mirror 120 and is reflected in the specific polarization reflection region 120R. Therefore, the s-polarized light in the blue illumination light is eventually shielded by the specific polarized light reflection region 120R. Therefore, at the position Pa, as shown in FIG. 7A, the s-polarized light in the blue illumination light is shielded from the region corresponding to the specific polarization reflection region 120R, and the region corresponding to the transmission region 120T is the red illumination light and the region corresponding to the transmission region 120T. The distribution of brightness (light intensity) is darker than that of green illumination light.

That is, as shown in FIG. 7B, the s polarization in the blue illumination light has a light intensity BR2 (BR2 <BR1) smaller than the light intensity BR1 of the red illumination light and the green illumination light in the region corresponding to the transmission region 120T. The region corresponding to the specific polarization reflection region 120R has a light intensity BR3 (BR2> BR3 = 0) smaller than the light intensity BR2 in the region corresponding to the transmission region 120T.

The p-polarized light in the blue illumination light passes through the specific polarized light reflection region 120R and the transmission region 120T of the dichroic mirror 120. Therefore, at the position Pa, as shown in FIG. 8A, the p-polarization in the blue illumination light is darker than the red illumination light and the green illumination light, and the distribution of brightness (light intensity) is uniform. That is, as shown in FIG. 8B, the p-polarization in the blue illumination light has a light intensity BR4 (BR4 <BR1) smaller than the light intensity BR1 of the red illumination light and the green illumination light at the position Pa.

Therefore, the blue illumination light including the s-polarized light having the brightness (light intensity) distribution shown in FIGS. 7A and 7B and the p-polarized light having the brightness (light intensity) distribution shown in FIGS. 8A and 8B is shown in FIG. As shown in 6A, the region corresponding to the transmission region 120T has the same brightness as the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 120R is the red illumination light and the green illumination. The distribution of brightness (light intensity) is darker than that of light.

That is, as shown in FIG. 6B, the blue illumination light has the same light intensity BR5 (BR5 = BR1) as the red illumination light and the light intensity BR1 of the green illumination light in the region corresponding to the transmission region 120T, and is specified. The region corresponding to the polarization reflection region 120R has a light intensity BR6 (BR6 <BR5) smaller than the light intensity BR5 of the region corresponding to the transmission region 120T. The difference between the light intensity BR5 and the light intensity BR6 of the blue illumination light at the position Pa is defined as the light intensity difference BRDa.

The lenses 132 and 133 shown in FIG. 3 are, for example, fly-eye lenses. As shown in FIG. 3, the blue illumination light and the yellow illumination light transmitted through the dichroic mirror 120 are reflected by the reflection mirror 141. Further, the blue illumination light and the yellow illumination light make the illumination distributions of the red illumination light, the green illumination light, and the blue illumination light irradiated to the image display elements 108R, 108G, and 108B by the lenses 132 and 133 uniform.

The retardation plate 103 is arranged between the dichroic mirror 120 and the polarization conversion element 150 on the optical path of the blue illumination light and the yellow illumination light. FIG. 3 shows a state in which the retardation plate 103 is arranged between the lens 132 and the lens 133 as an example. The retardation plate 103 is arranged in a direction of converting linearly polarized light into circularly polarized light. The retardation plate 103 is, for example, a λ / 4 retardation plate.

Using FIGS. 9A, 9B, 10A, 10B, 11A, 11B, 12A, and 12B, the blue illumination light and the blue illumination at the position Pb where the yellow illumination light has passed through the retardation plate 103. The distribution of brightness between the illumination light, the red illumination light included in the yellow illumination light, and the green illumination light will be described. 9A, 9B, 10A, 10B, 11A, 11B, 12A, and 12B are FIGS. 5A, 5B, 6A, 6B, 7A, 7B, 8A, and. Corresponds to FIG. 8B respectively.

FIG. 9A shows the distribution of the brightness of the red illumination light and the green illumination light included in the yellow illumination light in shades of light. FIG. 9B shows the distribution of the brightness of the red illumination light and the green illumination light in A5-A5 shown in FIG. 9A as the light intensity distribution. At position Pb, as shown in FIG. 9A, the distribution of the brightness (light intensity) of the red illumination light and the green illumination light is uniform. As shown in FIG. 9B, the light intensity of the red illumination light and the green illumination light at the position Pb is defined as BR7.

FIG. 10A corresponds to FIG. 9A and shows the distribution of the brightness of the blue illumination light in shades. FIG. 10B shows the distribution of the brightness of the blue illumination light in A6-A6 shown in FIG. 10A as the distribution of the light intensity. FIG. 11A corresponds to FIG. 10A and shows the distribution of the brightness of s-polarized light in the blue illumination light in shades of light. FIG. 11B shows the distribution of the brightness of the s-polarized light of the blue illumination light in A7-A7 shown in FIG. 11A as the distribution of the light intensity. FIG. 12A corresponds to FIG. 10A and shows the distribution of the brightness of p-polarized light in the blue illumination light in shades of light. FIG. 12B shows the distribution of the brightness of the p-polarized light of the blue illumination light in A8-A8 shown in FIG. 12A as the distribution of the light intensity.

The retardation plate 103 converts linearly polarized blue illumination light into circularly polarized light. The retardation plate 103 converts the blue illumination light into circularly polarized light so that the s-polarized light and the p-polarized light in the blue illumination light have the same brightness (light intensity) distribution as shown in FIGS. 11A and 12A. be able to. Regarding the s-polarized light and the p-polarized light in the blue illumination light, the region corresponding to the transmission region 120T is darker than the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 120R is the transmission region 120T. The distribution of brightness (light intensity) is even darker than the corresponding region.

That is, as shown in FIG. 11B, the s polarization in the blue illumination light has a light intensity BR8 (BR8 <BR7) smaller than the light intensity BR7 of the red illumination light and the green illumination light in the region corresponding to the transmission region 120T. In the region corresponding to the specific polarization reflection region 120R, the region has a light intensity BR9 (BR9 <BR8) smaller than the light intensity BR8 in the region corresponding to the transmission region 120T.

As shown in FIG. 12B, the p-polarization in the blue illumination light has a red illumination light in the region corresponding to the transmission region 120T and a light intensity BR10 (BR10 <BR7) smaller than the light intensity BR7 of the green illumination light. The region corresponding to the specific polarization reflection region 120R has a light intensity BR11 (BR11 <BR10) smaller than the light intensity BR10 in the region corresponding to the transmission region 120T.

Therefore, the blue illumination light including the s-polarized light having the brightness (light intensity) distribution shown in FIGS. 11A and 11B and the p-polarized light having the brightness (light intensity) distribution shown in FIGS. 12A and 12B is shown in FIG. As shown in 10A, the region corresponding to the transmission region 120T has the same brightness as the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 120R is the red illumination light and the green illumination. The distribution of brightness (light intensity) is darker than that of light.

That is, as shown in FIG. 10B, the blue illumination light has the same light intensity BR12 (BR12 = BR7) as the red illumination light and the light intensity BR7 of the green illumination light in the region corresponding to the transmission region 120T, and is specified. The region corresponding to the polarization reflection region 120R has a light intensity BR13 (BR13 <BR12) smaller than the light intensity BR12 in the region corresponding to the transmission region 120T. The difference between the light intensity BR12 and the light intensity BR13 of the blue illumination light at the position Pb is defined as the light intensity difference BRDb.

At the position Pb, it is preferable that the s-polarized light intensities BR8 and BR9 and the p-polarized light intensities BR10 and BR11 in the blue illumination light have the same value, respectively. At the position Pa where the blue illumination light is transmitted through the dichroic mirror 120 and the position Pb where the blue illumination light is transmitted through the retardation plate 103, the light intensity difference BRDa and the light intensity difference BRDb are substantially the same values.

As shown in FIG. 3, the polarization conversion element 150 is arranged on the optical path of the blue illumination light and the yellow illumination light transmitted through the retardation plate 103. The blue illumination light and the yellow illumination light transmitted through the retardation plate 103 are incident on the polarization conversion element 150.

FIG. 13 shows a configuration example of the polarization conversion element 150. The polarization conversion element 150 includes a polarization beam splitter 151 and a retardation plate 152. In the first embodiment, the retardation plate 152 is used as the second retardation plate. The polarization beam splitter 151 reflects either s-polarized light or p-polarized light and transmits the other. FIG. 13 shows a state in which the polarization beam splitter 151 reflects s-polarized light and transmits p-polarized light.

The retardation plate 152 converts either s-polarized light or p-polarized light into the other. FIG. 13 shows a state in which the retardation plate 152 converts s-polarized light into p-polarized light. The retardation plate 152 is, for example, a λ / 2 retardation plate. The specific polarization reflection region 120R of the dichroic mirror 120 and the retardation plate 152 of the polarization conversion element 150 correspond to each other.

Using FIGS. 14A, 14B, 15A, 15B, 16A, 16B, 17A, and 17B, the blue illumination light and the blue illumination at position Pc where the yellow illumination light has passed through the polarization conversion element 150. The distribution of brightness between the illumination light, the red illumination light included in the yellow illumination light, and the green illumination light will be described. The position Pc corresponds to the position of the illumination pupil. 14A, 14B, 15A, 15B, 16A, 16B, 17A, and 17B are FIGS. 9A, 9B, 10A, 10B, 11A, 11B, 12A, and. Corresponds to FIG. 12B respectively.

FIG. 14A shows the distribution of the brightness of the red illumination light and the green illumination light included in the yellow illumination light in shades of light. FIG. 14B shows the distribution of the brightness of the red illumination light and the green illumination light in A9-A9 shown in FIG. 14A as the light intensity distribution. The yellow illumination light is aligned with p-polarized light by the polarization conversion element 150. In the illumination pupil (position Pc), as shown in FIG. 14A, the distribution of the brightness (light intensity) of the red illumination light and the green illumination light is uniform. As shown in FIG. 14B, the light intensity of the red illumination light and the green illumination light in the illumination pupil is defined as BR14.

FIG. 15A corresponds to FIG. 14A and shows the distribution of the brightness of the blue illumination light in the illumination pupil (position Pc) in shades. FIG. 15B shows the distribution of the brightness of the blue illumination light in A10-A10 shown in FIG. 15A as the distribution of the light intensity. 16A and 17A correspond to FIG. 15A and show the distribution of the brightness of the blue illumination light in shades. FIG. 16B shows the distribution of the brightness of the blue illumination light in A11-A11 shown in FIG. 16A as the distribution of the light intensity. FIG. 17B shows the distribution of the brightness of the blue illumination light in A12-A12 shown in FIG. 17A as the distribution of the light intensity.

16A and 16B correspond to FIGS. 11A and 11B. The distribution of the brightness (light intensity) of the blue illumination light shown in FIGS. 16A and 16B corresponds to the distribution of the brightness (light intensity) of s-polarized light in the blue illumination light incident on the polarization conversion element 150. 17A and 17B correspond to FIGS. 12A and 12B. The distribution of the brightness (light intensity) of the blue illumination light shown in FIGS. 17A and 17B corresponds to the distribution of the brightness (light intensity) of p-polarized light in the blue illumination light incident on the polarization conversion element 150.

As shown in FIG. 13, the polarization conversion element 150 transmits p-polarized light. As shown in FIG. 17A, the p-polarized light in the blue illumination light incident on the polarization conversion element 150 has a region corresponding to the transmission region 120T darker than the red illumination light and the green illumination light, and the specific polarization reflection region 120R. The region corresponding to is transmitted through the polarization conversion element 150 with a distribution of brightness (light intensity) darker than the region corresponding to the transmission region 120T.

That is, as shown in FIG. 17B, the p-polarized light in the blue illumination light incident on the polarization conversion element 150 has a light intensity smaller than that of the red illumination light and the green illumination light BR14 in the region corresponding to the transmission region 120T. The polarization conversion element 150 has BR19 (BR19 <BR14), and has a light intensity BR20 (BR20 <BR19) smaller than the light intensity BR19 in the region corresponding to the transmission region 120T in the region corresponding to the specific polarization reflection region 120R. Is transparent.

As shown in FIG. 13, the polarization conversion element 150 shifts the optical axis of the s polarization in the reflection direction by reflecting the s-polarized light incident on the polarization conversion element 150 in the polarization beam splitter 151. The polarization conversion element 150 converts s-polarized light into p-polarized light by the retardation plate 152. Therefore, the blue illumination light is aligned with p-polarized light by the polarization conversion element 150.

As shown in FIGS. 16A and 16B, the distribution of brightness (light intensity) shown in FIGS. 11A and 11B of s-polarized light in the blue illumination light incident on the polarization conversion element 150 is shifted in the reflection direction by the polarization conversion element 150. It becomes p-polarized blue illumination light having a distributed brightness (light intensity) and is emitted from the polarization conversion element 150.

Regarding the s-polarized light in the blue illumination light incident on the polarization conversion element 150, the region corresponding to the transmission region 120T is darker than the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 120R is the transmission region. It becomes p-polarized blue illumination light having a distribution of brightness (light intensity) darker than the region corresponding to 120T and is emitted from the polarization conversion element 150.

That is, as shown in FIG. 16B, the s-polarized light in the blue illumination light incident on the polarization conversion element 150 has a light intensity smaller than that of the red illumination light and the green illumination light BR14 in the region corresponding to the transmission region 120T. P-polarized blue illumination light having BR17 (BR17 <BR14) and having a light intensity BR18 (BR18 <BR17) smaller than the light intensity BR17 in the region corresponding to the transmission region 120T in the region corresponding to the specific polarization reflection region 120R. Is emitted from the polarization conversion element 150.

Therefore, as shown in FIG. 15A, the blue illumination light aligned to p-polarization by the polarization conversion element 150 has the same brightness as the red illumination light and the green illumination light in the region corresponding to the transmission region 120T. The region corresponding to the specific polarization reflection region 120R has a distribution of brightness (light intensity) darker than that of the red illumination light and the green illumination light.

That is, as shown in FIG. 15B, the blue illumination light emitted from the polarization conversion element 150 has the same light intensity BR15 (BR15) as the light intensity BR14 of the red illumination light and the green illumination light in the region corresponding to the transmission region 120T. = BR14), and the region corresponding to the specific polarization reflection region 120R has a light intensity BR16 (BR16 <BR15) smaller than the light intensity BR15 in the region corresponding to the transmission region 120T. The difference between the light intensity BR15 and the light intensity BR16 of the blue illumination light in the illumination pupil (position Pc) is defined as the light intensity difference BRDc.

In the multi-projection system 1 using the projector 100 and the projector 100, the blue illumination light emitted from the plurality of blue laser elements BL constituting the light source 101 is converted from linearly polarized light to circularly polarized light by the retardation plate 103, and further polarized light is converted. The element 150 transmits the p-polarized light in the blue illumination light and shifts the optical axis of the s-polarized light.

Therefore, according to the projector 100 and the multi-projection system 1, the light intensity difference BRDc of the blue illumination light at the illumination pupil (position Pc) is made smaller than the light intensity difference BRDa and BRDb of the blue illumination light at the positions Pa and Pb. Therefore, it is possible to reduce the variation in the brightness of the blue illumination light.

As shown in FIG. 3, the dichroic mirror 105 is arranged on the optical path of the blue illumination light and the yellow illumination light transmitted through the polarization conversion element 150. The blue illumination light and the yellow illumination light aligned to P-polarized light by the polarization conversion element 150 are irradiated to the dichroic mirror 105 via the lens 134. The lens 134 is, for example, a condenser lens. The dichroic mirror 105 separates the incident blue illumination light and the yellow illumination light.

The yellow illumination light YLL separated by the dichroic mirror 105 is reflected by the reflection mirror 142. The dichroic mirror 106 is arranged on the optical path of the yellow illumination light YLL. The yellow illumination light YLL reflected by the reflection mirror 142 is applied to the dichroic mirror 106. The dichroic mirror 106 separates incident light by reflection and transmission with the separation wavelength as the separation boundary.

The dichroic mirror 106 separates the yellow illumination light YLL into a red illumination light RLL containing a red band component and a green illumination light GLL containing a green band component. In FIG. 3, the dichroic mirror 106 reflects the green illumination light GLL with respect to the incident yellow illumination light YLL and transmits the red illumination light RLL to separate the green illumination light GLL and the red illumination light RLL. Here, the reflectance of the green illumination light GLL and the transmittance of the red illumination light RLL are 100% on the short wavelength side and 100% on the long wavelength side with the separation wavelength as a boundary.

At wavelengths near the separation wavelength, the reflectance of the green illumination light GLL and the transmittance of the red illumination light RLL become small, so it can be said that the separation boundary has a width centered on the separation wavelength. Depending on the width of this separation boundary, the red illumination light RLL contains a component in the green wavelength band, and the green illumination light GLL contains a component in the red wavelength band. It is ideal from the viewpoint of light energy utilization efficiency that there is no width of the separation boundary.

The red illumination light RLL separated by the dichroic mirror 106 is irradiated to the reflective polarizing plate 107R via the lens 135. The green illumination light GLL separated by the dichroic mirror 106 is irradiated to the reflective polarizing plate 107G via the lens 136. The blue illumination light BLL separated by the dichroic mirror 105 is reflected by the reflection mirror 143 and is irradiated to the reflective polarizing plate 107B via the lens 137.

The reflective polarizing plates 107R, 107G, and 107B reflect either s-polarized light or p-polarized light and transmit the other. FIG. 3 shows a state in which the reflective polarizing plates 107R, 107G, and 107B reflect s-polarized light and transmit p-polarized light. Wire grids may be used as the reflective polarizing plates 107R, 107G, and 107B. The p-polarized red illumination light RLL, green illumination light GLL, and blue illumination light BLL transmit the reflective polarizing plates 107R, 107G, and 107B, respectively, and pass through the image display elements 108R, 108G, and 108B, respectively. Be irradiated.

The image display element 108R photomodulates the red illumination light RLL based on the image data of the red component to generate the s-polarized red image light RML. The image display element 108G photomodulates the green illumination light GLL based on the image data of the green component to generate the s-polarized green image light GML. The image display element 108B photomodulates the blue illumination light BLL based on the image data of the blue component to generate the s-polarized blue image light BML. That is, the image display element 108R functions as a red image light modulation element, the image display element 108G functions as a green image light modulation element, and the image display element 108B functions as a blue image light modulation element.

The red image light RML, green image light GML, and blue image light BML generated by the image display elements 108R, 108G, and 108B are reflected by the reflective polarizing plates 107R, 107G, and 107B, respectively, and are color-synthesized. The prism 109 is irradiated. The color synthesis prism 109 reflects the red image light RML and the blue image light BML and transmits the green image light GML to synthesize the red image light RML, the green image light GML, and the blue image light BML.

As shown in FIG. 1 or 3, the red image light RML, the green image light GML, and the blue image light BML synthesized by the color synthesis prism 109 are projected onto the screen SRN or the like via the aperture 110 and the projection lens 111. Will be done. As a result, the projector 100 displays a full-color image IM in which the red image light RML, the green image light GML, and the blue image light BML are combined on the screen SRN or the like.

As shown in FIG. 3, the position Pd of the aperture 110 corresponds to the position of the projection pupil. The illuminated pupil and the projected pupil have a conjugate relationship. Therefore, the brightness distributions of the red image light RML, the green image light GML, and the blue image light BML at the position Pd corresponding to the position of the projection pupil are the red illumination light RLL at the position Pc corresponding to the position of the illumination pupil. It corresponds to the brightness distribution of the green illumination light GLL and the blue illumination light BLL.

A comparative example is a state in which the retardation plate 103 is not arranged. In the comparative example, the brightness distributions of the red image light RML, the green image light GML, and the blue image light BML at the position Pd corresponding to the position of the projection pupil are the red illumination light RLL, the green illumination light GLL, at the position Pa. It also corresponds to the brightness distribution of the blue illumination light BLL.

Therefore, according to the projector 100 and the multi-projection system 1, the blue illumination light BLL is converted into circularly polarized light by the retardation plate 103, and the s-polarized light axis of the blue illumination light is further shifted by the polarization conversion element 150. It is possible to reduce the variation in the brightness of the blue image light BLL in the projection pupil as compared with the comparative example.

Therefore, according to the projector 100 and the multi-projection system 1, the color distribution caused by the light-shielding plate 10 can be reduced by reducing the variation in the brightness of the blue image light BLL in the projection pupil. According to the projector 100 and the multi-projection system 1, when the projector 100 has a blue laser element BL and a phosphor 102 as a plurality of illumination light sources, deterioration of the quality of the multi-projection image can be suppressed.

[Second Embodiment]
A configuration example of the projector PJ will be described with reference to FIG. The projector 200 of the second embodiment shown in FIG. 18 corresponds to the projectors PJ (PJa and PJb) shown in FIGS. 1, 2A, and 2B. FIG. 18 corresponds to FIG. In order to make the explanation easy to understand, the same components as those of the projector 100 of the first embodiment are designated by the same reference numerals.

Compared with the projector 100 of the first embodiment, the projector 200 of the second embodiment has a configuration of the dichroic mirror 220 corresponding to the dichroic mirror 120 and a positional relationship between the light source 101 and the phosphor 102 with respect to the dichroic mirror 220. different.

As shown in FIG. 18, the projector 200 includes a light source 101, a phosphor 102, a dichroic mirror 220, lenses 131 to 137, reflection mirrors 141 to 143, a retardation plate 103, and a polarization conversion element 150. Be prepared. In the second embodiment, the retardation plate 103 is used as the first retardation plate.

Further, the projector 200 includes dichroic mirrors 105 and 106, reflective polarizing plates 107R, 107G, and 107B, image display elements 108R, 108G, and 108B, a color synthesis prism 109, an aperture 110, and a projection lens 111. And.

In the second embodiment, the dichroic mirror 220 is a first dichroic mirror, the dichroic mirror 105 is a second dichroic mirror, and the dichroic mirror 106 is a third dichroic mirror.

The light source 101 emits blue laser light from each of the plurality of blue laser elements BL. The blue laser light is linearly polarized light of s-polarized light or p-polarized light. FIG. 18 shows a case where the blue laser light is linearly polarized p-polarized light. The blue laser light is applied to the dichroic mirror 220. In the second embodiment, the light source 101 is used as the first illumination light source, and the blue laser light is used as the first illumination light. Further, the s-polarized light is the first polarized light, and the p-polarized light is the second polarized light.

The dichroic mirror 220 is arranged so that the polarization direction of the blue laser light is s-polarized with respect to the dichroic mirror 220. The dichroic mirror 220 has an optical property of reflecting s-polarized light with respect to blue laser light and transmitting p-polarized light. The blue laser light emitted from the light source 101 passes through the dichroic mirror 220, is further condensed by the lens 131, and is irradiated to the phosphor 102.

The phosphor 102 has a fluorescent layer and a reflecting surface. The fluorescent layer is a yellow illumination light containing a red band component and a green band component having an intensity corresponding to the energy intensity of the light emitted from the light source 101, specifically, the blue laser light emitted from the light source 101. To generate. The reflecting surface reflects the blue laser light transmitted through the fluorescent layer and the yellow illumination light generated by the fluorescent layer.

In the second embodiment, the phosphor 102 is used as the second illumination light source, and the yellow illumination light is used as the second illumination light. Therefore, the projector 200 has a light source 101 (blue laser element BL) which is a first illumination light source and a phosphor 102 which is a second illumination light source as a plurality of illumination light sources.

The yellow illumination light, which is the fluorescence generated by the phosphor 102, is applied to the dichroic mirror 220 via the lens 131. A part of the blue laser light is diffused by the phosphor 102 to become random polarized light in which a plurality of polarized lights are mixed, and is irradiated to the dichroic mirror 220 via the lens 131. That is, the dichroic mirror 220 is arranged on the optical path of the blue laser light and the yellow illumination light. The dichroic mirror 220 has an optical property of reflecting yellow illumination light.

FIG. 19A shows a configuration example of the dichroic mirror 220. FIG. 19A shows a state in which the dichroic mirror 220 is viewed from the side opposite to the light source 101, that is, a state in which the dichroic mirror 220 is viewed from below in FIG. The dichroic mirror 220 has a specific polarization reflection region 220R and a total reflection region 220T.

The specific polarization reflection region 220R transmits the p-polarized light in the blue laser light and reflects the s-polarized light in the blue laser light and the yellow illumination light. The total reflection region 220T reflects all the polarized light including the s-polarized light and the p-polarized light in the blue laser light and the yellow illumination light.

The specific polarization reflection region 220R is arranged on the optical axis BLA of the blue laser element BL. The specific polarized light reflection region 220R is formed so as to have an area larger than the luminous flux width of the blue laser light. Therefore, all the blue laser light emitted from the plurality of blue laser elements BL passes through the dichroic mirror 220 and irradiates the lens 131. Further, the blue laser light is focused by the lens 131 and irradiated to the phosphor 102.

The specific polarized light reflection region 220R is formed so as to have an area smaller than the luminous flux width of the diffused light emitted from the phosphor 102 through the lens 131. Of the blue laser light emitted from the phosphor 102 to the specific polarized light reflection region 220R, the s-polarized light component is reflected by the specific polarized light reflection region 220R toward the reflection mirror 141. Of the blue laser light emitted from the phosphor 102 to the specific polarized light reflection region 220R, the p-polarized light component passes through the specific polarized light reflection region 120R and is returned to the light source 101.

The blue laser light emitted from the phosphor 102 to the total reflection region 220T is reflected by the total reflection region 220T toward the reflection mirror 141. The blue laser light reflected by the dichroic mirror 220 toward the reflection mirror 141 is defined as blue illumination light.

The yellow illumination light emitted from the phosphor 102 through the lens 131 to the dichroic mirror 220 is reflected toward the reflection mirror 141 by the specific polarization reflection region 220R and the total reflection region 220T. As shown in FIG. 19B, the dichroic mirror 220 may be configured such that the specific polarization reflection region 220R is arranged on the optical axis BLA of the blue laser element BL, and the region other than the specific polarization reflection region 220R is the total reflection region 220T. good.

The dichroic mirror 220 uses a transparent material such as a glass plate or a prism to form, for example, a dielectric multilayer film in a region to be a specific polarization reflection region 220R, and a metal film or a dielectric multilayer to be formed in a region to be a total reflection region 220T. It can be produced by forming a reflective film such as a film. The optical characteristics of the specific polarization reflection region 120R can be set according to the material and film thickness of the dielectric constituting the dielectric multilayer film.

Using FIGS. 20A, 20B, 21A, 21B, 22A, 22B, 23A, and 23B, blue illumination at position Pe where the blue illumination light and the yellow illumination light are reflected by the dichroic mirror 220. The distribution of brightness between the red illumination light and the green illumination light included in the light and the yellow illumination light will be described. 20A, 20B, 21A, 21B, 22A, 22B, 23A, and 23B show the case where the dichroic mirror 220 has the shape shown in FIG. 19A.

The position Pe shown in FIG. 18 corresponds to the position Pa shown in FIG. The region corresponding to the specific polarization reflection region 220R at the position Pe corresponds to the region corresponding to the specific polarization reflection region 120R at the position Pa. The region corresponding to the total reflection region 220T at the position Pe corresponds to the region corresponding to the transmission region 120T at the position Pa.

FIG. 20A shows the distribution of the brightness of the red illumination light and the green illumination light included in the yellow illumination light at the position Pe in shades of light. FIG. 21B shows the distribution of the brightness of the red illumination light and the green illumination light in A21-A21 shown in FIG. 20A as the distribution of light intensity. The red illumination light is composed of the red band component contained in the yellow illumination light, and the green illumination light is composed of the green band component contained in the yellow illumination light.

The yellow illumination light reflects the specific polarization reflection region 220R and the total reflection region 220T of the dichroic mirror 220. Therefore, at the position Pe, as shown in FIG. 20A or FIG. 20B, the distribution of the brightness (light intensity) of the red illumination light and the green illumination light is uniform. Let BR21 be the light intensity of the red illumination light and the green illumination light at the position Pe.

The distribution of the brightness (light intensity) of the red illumination light and the green illumination light shown in FIGS. 20A and 20B is the brightness (light intensity) of the red illumination light and the green illumination light shown in FIGS. 5A and 5B. Corresponds to the distribution of. The light intensity BR21 of the red illumination light and the green illumination light at the position Pe corresponds to the light intensity BR1 of the red illumination light and the green illumination light at the position Pa.

FIG. 21A corresponds to FIG. 20A and shows the distribution of the brightness of the blue illumination light in shades. FIG. 21B shows the distribution of the brightness of the blue illumination light in A22-A22 shown in FIG. 21A as the distribution of the light intensity. FIG. 22A corresponds to FIG. 21A and shows the distribution of the brightness of s-polarized light in the blue illumination light in shades of light. FIG. 22B shows the distribution of the brightness of the s-polarized light of the blue illumination light in A23-A23 shown in FIG. 22A as the distribution of the light intensity. FIG. 23A corresponds to FIG. 21A and shows the distribution of the brightness of p-polarized light in the blue illumination light in shades of light. FIG. 23B shows the distribution of the brightness of the p-polarized light of the blue illumination light in A24-A24 shown in FIG. 23A as the distribution of the light intensity.

The s-polarized light in the blue illumination light reflects the specific polarized light reflection region 220R and the total reflection region 220T of the dichroic mirror 220. Therefore, at the position Pe, as shown in FIG. 22A, the s-polarized light in the blue illumination light is darker than the red illumination light and the green illumination light, and the distribution of brightness (light intensity) is uniform. That is, as shown in FIG. 22B, the s-polarized light in the blue illumination light has a light intensity BR22 (BR22 <BR21) smaller than the light intensity BR21 of the red illumination light and the green illumination light at the position Pe.

The distribution of the brightness (light intensity) of s-polarized light in the blue illumination light shown in FIGS. 22A and 22B corresponds to the distribution of the brightness (light intensity) of p-polarized light in the blue illumination light shown in FIGS. 8A and 8B. The s-polarized light intensity BR 22 of the blue illumination light at the position Pe corresponds to the p-polarized light intensity BR 4 of the blue illumination light at the position Pa.

The p-polarized light in the blue illumination light passes through the specific polarization reflection region 220R of the dichroic mirror 220 and is reflected in the total reflection region 220T. Therefore, the p-polarized light in the blue illumination light is not applied to the region corresponding to the specific polarized light reflection region 220R at the position Pe. Therefore, at the position Pe, as shown in FIG. 23A, the p-polarized light in the blue illumination light does not irradiate the region corresponding to the specific polarization reflection region 220R, and the region corresponding to the total reflection region 220T is the red illumination light. , And the distribution of brightness (light intensity) is darker than that of green illumination light.

That is, as shown in FIG. 23B, the p-polarized light in the blue illumination light has a light intensity BR23 (BR23 <BR21) smaller than the light intensity BR21 of the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. In the region corresponding to the specific polarization reflection region 220R, the light intensity BR24 (BR23> BR4 = 0) is smaller than the light intensity BR23 in the region corresponding to the total reflection region 220T.

The distribution of the brightness (light intensity) of p-polarized light in the blue illumination light shown in FIGS. 23A and 23B corresponds to the distribution of the brightness (light intensity) of s-polarized light in the blue illumination light shown in FIGS. 7A and 7B. The p-polarized light intensities BR23 and BR24 of the blue illumination light at position Pe correspond to the s-polarized light intensities BR2 and BR3 of the blue illumination light at position Pa.

Therefore, the blue illumination light including the s-polarized light having the brightness (light intensity) distribution shown in FIGS. 22A and 22B and the p-polarized light having the brightness (light intensity) distribution shown in FIGS. 23A and 23B is shown in FIG. As shown in 21A, the region corresponding to the total reflection region 220T has the same brightness as the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 220R is the red illumination light and the green. The distribution of brightness (light intensity) is darker than that of the illumination light.

That is, as shown in FIG. 21B, the blue illumination light has the same light intensity BR25 (BR25 = BR21) as the light intensity BR21 of the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. The region corresponding to the specific polarization reflection region 220R has a light intensity BR26 (BR26 <BR25) smaller than the light intensity BR25 in the region corresponding to the total reflection region 220T. The difference between the light intensity BR25 and the light intensity BR26 of the blue illumination light at the position Pe is defined as the light intensity difference BRDe.

The distribution of the brightness (light intensity) of the blue illumination light shown in FIGS. 21A and 21B corresponds to the distribution of the brightness (light intensity) of the blue illumination light shown in FIGS. 6A and 6B. The light intensities BR25 and BR26 of the blue illumination light at the position Pe correspond to the light intensities BR5 and BR6 of the blue illumination light at the position Pa. The light intensity difference BRDe of the blue illumination light at the position Pe corresponds to the light intensity difference BRDa of the blue illumination light at the position Pa.

As shown in FIG. 18, the blue illumination light and the yellow illumination light reflected by the dichroic mirror 220 are further reflected by the reflection mirror 141. The blue illumination light and the yellow illumination light make the illumination distribution of the red illumination light, the green illumination light, and the blue illumination light irradiated to the image display elements 108R, 108G, and 108B by the lenses 132 and 133 uniform.

The retardation plate 103 is arranged between the dichroic mirror 120 and the polarization conversion element 150 on the optical path of the blue illumination light and the yellow illumination light. FIG. 18 shows a state in which the retardation plate 103 is arranged between the lens 132 and the lens 133 as an example. The retardation plate 103 is arranged in a direction of converting linearly polarized light into circularly polarized light. The retardation plate 103 is, for example, a λ / 4 retardation plate.

Using FIGS. 9A, 9B, 10A, 10B, 11A, 11B, 12A, and 12B, the blue illumination light and the blue illumination light at the position Pf transmitted through the retardation plate 103. The distribution of brightness between the illumination light, the red illumination light included in the yellow illumination light, and the green illumination light will be described. 9A, 9B, 10A, 10B, 11A, 11B, 12A, and 12B are FIGS. 20A, 20B, 21A, 21B, 22A, 22B, 23A, and. Corresponds to FIG. 23B respectively.

The position Pf shown in FIG. 18 corresponds to the position Pb shown in FIG. The region corresponding to the specific polarization reflection region 220R at the position Pf corresponds to the region corresponding to the specific polarization reflection region 120R at the position Pb. The region corresponding to the total reflection region 220T at the position Pf corresponds to the region corresponding to the transmission region 120T at the position Pb.

At the position Pf, as shown in FIG. 9A, the distribution of the brightness (light intensity) of the red illumination light and the green illumination light is uniform. As shown in FIG. 9B, the light intensity of the red illumination light and the green illumination light at the position Pf is defined as BR27. The light intensity BR 27 of the red illumination light and the green illumination light at the position Pf corresponds to the light intensity BR 7 of the red illumination light and the green illumination light at the position Pb.

The retardation plate 103 converts linearly polarized blue illumination light into circularly polarized light. The retardation plate 103 converts the blue illumination light into circularly polarized light so that the s-polarized light and the p-polarized light in the blue illumination light have the same brightness (light intensity) distribution as shown in FIGS. 11A and 12A. be able to.

Regarding the s-polarized light and the p-polarized light in the blue illumination light, the region corresponding to the total reflection region 220T is darker than the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 220R is the total reflection region. The distribution of brightness (light intensity) is even darker than the region corresponding to 220T.

That is, as shown in FIG. 11B, the s polarization in the blue illumination light is light intensity BR28 (BR28 <BR27) smaller than the light intensity BR27 of the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. In the region corresponding to the specific polarization reflection region 220R, the light intensity BR29 (BR29 <BR28) is smaller than the light intensity BR28 in the region corresponding to the total reflection region 220T. The s-polarized light intensities BR28 and BR29 of the blue illumination light at the position Pf correspond to the s-polarized light intensities BR8 and BR9 of the blue illumination light at the position Pb.

As shown in FIG. 12B, the p-polarization in the blue illumination light has a red illumination light and a light intensity BR30 (BR30 <BR27) smaller than the light intensity BR27 of the green illumination light in the region corresponding to the total reflection region 220T. However, the region corresponding to the specific polarization reflection region 220R has a light intensity BR31 (BR31 <BR30) smaller than the light intensity BR30 in the region corresponding to the total reflection region 220T. The p-polarized light intensities BR30 and BR31 of the blue illumination light at the position Pf correspond to the p-polarized light intensities BR10 and BR11 of the blue illumination light at the position Pb.

Therefore, the blue illumination light including the s-polarized light having the brightness (light intensity) distribution shown in FIGS. 11A and 11B and the p-polarized light having the brightness (light intensity) distribution shown in FIGS. 12A and 12B is shown in FIG. As shown in 10A, the region corresponding to the total reflection region 220T has the same brightness as the red illumination light and the green illumination light, and the region corresponding to the specific polarization reflection region 220R is the red illumination light and the green. The distribution of brightness (light intensity) is darker than that of the illumination light.

That is, as shown in FIG. 10B, the blue illumination light has the same light intensity BR32 (BR32 = BR27) as the light intensity BR27 of the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. The region corresponding to the specific polarization reflection region 220R has a light intensity BR33 (BR33 <BR32) smaller than the light intensity BR32 in the region corresponding to the total reflection region 220T. The difference between the light intensity BR32 and the light intensity BR33 of the blue illumination light at the position Pf is defined as the light intensity difference BRDf.

The light intensities BR32 and BR33 of the blue illumination light at the position Pf correspond to the light intensities BR12 and BR13 of the blue illumination light at the position Pb. The light intensity difference BRDf of the blue illumination light at the position Pf corresponds to the light intensity difference BRDb of the blue illumination light at the position Pb.

At the position Pf, it is preferable that the s-polarized light intensities BR28 and BR29 and the p-polarized light intensities BR30 and BR31 in the blue illumination light have the same value, respectively. At the position Pe where the blue illumination light reflects the dichroic mirror 220 and the position Pf where the blue illumination light passes through the retardation plate 103, the light intensity difference BRDe and the light intensity difference BRDf are substantially the same values.

As shown in FIG. 3, the polarization conversion element 150 is arranged on the optical path of the blue illumination light and the yellow illumination light transmitted through the retardation plate 103. The blue illumination light and the yellow illumination light transmitted through the retardation plate 103 are incident on the polarization conversion element 150 shown in FIGS. 3 and 13. The specific polarization reflection region 220R of the dichroic mirror 220 and the retardation plate 152 of the polarization conversion element 150 correspond to each other. In the second embodiment, the retardation plate 152 is used as the second retardation plate.

Using FIGS. 14A, 14B, 15A, 15B, 16A, 16B, 17A, and 17B, the blue illumination light and the blue illumination at the position Pg where the yellow illumination light has passed through the polarization conversion element 150. The distribution of brightness between the illumination light, the red illumination light included in the yellow illumination light, and the green illumination light will be described. The position Pg corresponds to the position of the illumination pupil. 14A, 14B, 15A, 15B, 16A, 16B, 17A, and 17B are FIGS. 9A, 9B, 10A, 10B, 11A, 11B, 12A, and. Corresponds to FIG. 12B respectively.

The position Pg shown in FIG. 18 corresponds to the position Pc shown in FIG. The region corresponding to the specific polarization reflection region 220R at the position Pg corresponds to the region corresponding to the specific polarization reflection region 120R at the position Pc. The region corresponding to the total reflection region 220T at the position Pg corresponds to the region corresponding to the transmission region 120T at the position Pc.

The yellow illumination light is aligned with p-polarized light by the polarization conversion element 150. In the illumination pupil (position Pg), as shown in FIG. 14A, the distribution of the brightness (light intensity) of the red illumination light and the green illumination light is uniform. As shown in FIG. 14B, the light intensity of the red illumination light and the green illumination light in the illumination pupil is defined as BR34. The light intensity BR34 of the red illumination light and the green illumination light at the position Pg corresponds to the light intensity BR14 of the red illumination light and the green illumination light at the position Pc.

As shown in FIG. 13, the polarization conversion element 150 transmits p-polarized light. As shown in FIG. 17A, the p-polarized light in the blue illumination light incident on the polarization conversion element 150 is darker than the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T, and is a specific polarization reflection region. The region corresponding to 220R has a darker brightness (light intensity) distribution than the region corresponding to the total reflection region 220T and transmits the polarization conversion element 150.

That is, as shown in FIG. 17B, the p-polarization of the blue illumination light incident on the polarization conversion element 150 is smaller than the light intensity BR34 of the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. It has an intensity BR39 (BR39 <BR34), and in the region corresponding to the specific polarization reflection region 220R, it has a light intensity BR40 (BR40 <BR39) smaller than the light intensity BR39 in the region corresponding to the total reflection region 220T and is polarized. It transmits through the element 150. The p-polarized light intensities BR39 and BR40 of the blue illumination light at the position Pg correspond to the p-polarized light intensities BR19 and BR20 of the blue illumination light at the position Pc.

As shown in FIG. 13, the polarization conversion element 150 shifts the optical axis of the s polarization in the reflection direction by reflecting the s-polarized light incident on the polarization conversion element 150 in the polarization beam splitter 151. The polarization conversion element 150 converts s-polarized light into p-polarized light by the retardation plate 152. Therefore, the blue illumination light is aligned with p-polarized light by the polarization conversion element 150.

As shown in FIGS. 16A and 16B, the distribution of brightness (light intensity) shown in FIGS. 11A and 11B of s-polarized light in the blue illumination light incident on the polarization conversion element 150 is shifted in the reflection direction by the polarization conversion element 150. It becomes p-polarized blue illumination light having a distributed brightness (light intensity) and is emitted from the polarization conversion element 150.

The s-polarized light in the blue illumination light incident on the polarization conversion element 150 is darker than the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T, and the entire region corresponding to the specific polarization reflection region 220R. It becomes p-polarized blue illumination light having a distribution of brightness (light intensity) darker than the region corresponding to the reflection region 220T, and is emitted from the polarization conversion element 150.

That is, as shown in FIG. 16B, the s-polarized light in the blue illumination light incident on the polarization conversion element 150 is smaller than the light intensity BR34 of the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. P-polarized blue having an intensity BR37 (BR37 <BR34) and having a light intensity BR38 (BR38 <BR37) smaller than the light intensity BR37 in the region corresponding to the total reflection region 220T in the region corresponding to the specific polarization reflection region 220R. It becomes illumination light and is emitted from the polarization conversion element 150.

The light intensities BR37 and BR38 of the p-polarization of the blue illumination light at the position Pg corresponding to the s polarization of the blue illumination light at the position Pf are the p-polarization of the blue illumination light at the position Pc corresponding to the s polarization of the blue illumination light at the position Pb. Corresponds to the light intensities BR17 and BR18.

Therefore, as shown in FIG. 15A, the blue illumination light aligned to p-polarization by the polarization conversion element 150 has the same brightness as the red illumination light and the green illumination light in the region corresponding to the total reflection region 220T. In addition, the region corresponding to the specific polarization reflection region 220R has a distribution of brightness (light intensity) darker than that of the red illumination light and the green illumination light.

That is, as shown in FIG. 15B, the blue illumination light emitted from the polarization conversion element 150 has the same light intensity BR35 as the red illumination light and the green illumination light intensity BR34 in the region corresponding to the total reflection region 220T. BR35 = BR34), and the region corresponding to the specific polarization reflection region 220R has a light intensity BR36 (BR36 <BR35) smaller than the light intensity BR35 in the region corresponding to the total reflection region 220T. The difference between the light intensity BR35 and the light intensity BR36 of the blue illumination light in the illumination pupil (position Pg) is defined as the light intensity difference BRDg.

The light intensities BR35 and BR36 of the blue illumination light at the position Pg correspond to the light intensities BR15 and BR16 of the blue illumination light at the position Pc. The light intensity difference BRDg of the blue illumination light at the position Pg corresponds to the light intensity difference BRDc of the blue illumination light at the position Pc.

In the multi-projection system 1 using the projector 200 and the projector 200, the blue illumination light emitted from the plurality of blue laser elements BL constituting the light source 101 is converted from linearly polarized light to circularly polarized light by the retardation plate 103, and further polarized light is converted. The element 150 transmits the p-polarized light in the blue illumination light and shifts the optical axis of the s-polarized light.

Therefore, according to the projector 200 and the multi-projection system 1, the light intensity difference BRDg of the blue illumination light at the illumination pupil (position Pg) is made smaller than the light intensity difference BRDe and BRDf of the blue illumination light at the positions Pe and Pf. Therefore, it is possible to reduce the variation in the brightness of the blue illumination light.

As shown in FIG. 18, the blue illumination light and the yellow illumination light aligned to P-polarized light by the polarization conversion element 150 are irradiated to the dichroic mirror 105 via the lens 134. The dichroic mirror 105 separates the incident blue illumination light and the yellow illumination light.

The yellow illumination light YLL separated by the dichroic mirror 105 reflects the reflection mirror 142 and irradiates the dichroic mirror 106. The dichroic mirror 106 separates the yellow illumination light YLL into a red illumination light RLL containing a red band component and a green illumination light GLL containing a green band component.

The red illumination light RLL separated by the dichroic mirror 106 is irradiated to the reflective polarizing plate 107R via the lens 135. The green illumination light GLL separated by the dichroic mirror 106 is irradiated to the reflective polarizing plate 107G via the lens 136. The blue illumination light BLL separated by the dichroic mirror 105 is reflected by the reflection mirror 143 and is irradiated to the reflective polarizing plate 107B via the lens 137.

The reflective polarizing plates 107R, 107G, and 107B reflect either s-polarized light or p-polarized light and transmit the other. FIG. 18 shows a state in which the reflective polarizing plates 107R, 107G, and 107B reflect s-polarized light and transmit p-polarized light. The p-polarized red illumination light RLL, green illumination light GLL, and blue illumination light BLL transmit the reflective polarizing plates 107R, 107G, and 107B, respectively, and pass through the image display elements 108R, 108G, and 108B, respectively. Be irradiated.

The image display element 108R photomodulates the red illumination light RLL based on the image data of the red component to generate the s-polarized red image light RML. The image display element 108G photomodulates the green illumination light GLL based on the image data of the green component to generate the s-polarized green image light GML. The image display element 108B photomodulates the blue illumination light BLL based on the image data of the blue component to generate the s-polarized blue image light BML.

The red image light RML, green image light GML, and blue image light BML generated by the image display elements 108R, 108G, and 108B are reflected by the reflective polarizing plates 107R, 107G, and 107B, respectively, and are color-synthesized. The prism 109 is irradiated. The color synthesis prism 109 reflects the red image light RML and the blue image light BML and transmits the green image light GML to synthesize the red image light RML, the green image light GML, and the blue image light BML.

As shown in FIG. 1 or 18, the red image light RML, the green image light GML, and the blue image light BML synthesized by the color synthesis prism 109 are projected onto the screen SRN or the like via the aperture 110 and the projection lens 111. Will be done. As a result, the projector 200 displays a full-color image IM in which the red image light RML, the green image light GML, and the blue image light BML are combined on the screen SRN or the like.

As shown in FIG. 18, the position Ph of the aperture 110 corresponds to the position of the projection pupil. The position Ph shown in FIG. 18 corresponds to the position Pd shown in FIG. The illuminated pupil and the projected pupil have a conjugate relationship. Therefore, the brightness distributions of the red image light RML, the green image light GML, and the blue image light BML at the position Ph corresponding to the position of the projection pupil are such that the red illumination light RLL at the position Pg corresponding to the position of the illumination pupil. It corresponds to the brightness distribution of the green illumination light GLL and the blue illumination light BLL.

A comparative example is a state in which the retardation plate 103 is not arranged. In the comparative example, the brightness distributions of the red image light RML, the green image light GML, and the blue image light BML at the position Ph corresponding to the position of the projection pupil are the red illumination light RLL, the green illumination light GLL, at the position Pe. It also corresponds to the brightness distribution of the blue illumination light BLL.

Therefore, according to the projector 200 and the multi-projection system 1, the blue illumination light BLL is converted into circularly polarized light by the retardation plate 103, and the s-polarized light axis of the blue illumination light is shifted by the polarization conversion element 150. It is possible to reduce the variation in the brightness of the blue image light BLL in the projection pupil as compared with the comparative example.

Therefore, according to the projector 200 and the multi-projection system 1, the color distribution caused by the light-shielding plate 10 can be reduced by reducing the variation in the brightness of the blue image light BLL in the projection pupil. According to the projector 200 and the multi-projection system 1, when the projector 200 has a blue laser element BL and a phosphor 102 as a plurality of illumination light sources, deterioration of the quality of the multi-projection image can be suppressed.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

In the projectors 100 and 200 of the first and second embodiments, as shown in FIG. 13, the polarization conversion element 150 has a retardation plate 152 arranged on an s-polarized light path. As shown in FIG. 24, in the polarization conversion element 150, the retardation plate 152 may be arranged on the optical path of p-polarized light instead of s-polarized light.

In this case, the polarization conversion element 150 shifts the optical axis of the s polarization in the reflection direction by reflecting the s-polarized light incident on the polarization conversion element 150 in the polarization beam splitter 151. The polarization conversion element 150 converts p-polarized light into s-polarized light by the retardation plate 152. Therefore, the blue illumination light and the yellow illumination light emitted from the polarization conversion element 150 are aligned with s polarization by the polarization conversion element 150.

In the projectors 100 and 200 of the first and second embodiments, as shown in FIGS. 3 and 18, the dichroic mirrors 120 and 220 have a specific polarization reflection region 120R and 220R, and a transmission region 120T and a total reflection region 220T. They are arranged so that the longitudinal direction is toward the front and back of the paper surface. In the polarization conversion element 150, as shown in FIG. 13, the polarization beam splitter 151 shifts the s-polarized optical axis in the left-right direction of the paper surface in correspondence with the dichroic mirrors 120 and 220, and the length of the retardation plate 152. It is arranged so that the direction is toward the front and back of the paper.

The dichroic mirrors 120 and 220 may be arranged so that the longitudinal directions of the specific polarization reflection regions 120R and 220R, the transmission region 120T and the total reflection region 220T are the vertical directions of the paper surface, respectively. Specifically, the dichroic mirror 120 may be arranged so as to be rotated 90 degrees clockwise or counterclockwise with respect to the state shown in FIG. 4A. The dichroic mirror 220 may be arranged so as to be rotated 90 degrees clockwise or counterclockwise with respect to the state shown in FIG. 19A.

In the polarization conversion element 150, the polarization beam splitter 151 shifts the optical axis of s polarization toward the front and back of the paper surface in correspondence with the dichroic mirrors 120 and 220, and the longitudinal direction of the retardation plate 152 is the left-right direction of the paper surface. It is arranged so as to be.

In this case, as shown in FIG. 25, the polarization conversion element 150 shifts the optical axis of the p-polarization in the reflection direction by reflecting the p-polarized light incident on the polarization conversion element 150 in the polarization beam splitter 151. Further, the polarization conversion element 150 converts p-polarized light into s-polarized light by the retardation plate 152. The polarization conversion element 150 transmits s-polarized light incident on the polarization conversion element 150.

Therefore, the blue illumination light and the yellow illumination light emitted from the polarization conversion element 150 are aligned with s polarization by the polarization conversion element 150. It should be noted that each component after the polarization conversion element 150 has opposite characteristics for s-polarization and p-polarization when the blue illumination light and the yellow illumination light are aligned with p-polarization by the polarization conversion element 150. Become.

Further, a configuration in which FIGS. 24 and 25 are combined, that is, in the polarization conversion element 150, the polarization beam splitter 151 shifts the optical axis of s-polarized light toward the front and back of the paper surface with respect to the state shown in FIG. The retardation plate 152 may be arranged so that the longitudinal direction of the retardation plate 152 is the left-right direction of the paper surface, and the retardation plate 152 is arranged on a p-polarized optical path instead of s-polarized light.

The dichroic mirrors 120 and 220 are arranged so that the longitudinal directions of the specific polarization reflection regions 120R and 220R, the transmission region 120T and the total reflection region 220T are in the vertical direction of the paper surface with respect to the states shown in FIGS. 3 and 18, respectively. Will be done.

In this case, the polarization conversion element 150 shifts the optical axis of the p-polarization in the reflection direction by reflecting the p-polarized light incident on the polarization conversion element 150 in the polarization beam splitter 151. The polarization conversion element 150 converts the s-polarized light incident on the polarization conversion element 150 into p-polarized light by the retardation plate 152. Therefore, the blue illumination light and the yellow illumination light emitted from the polarization conversion element 150 are aligned with p-polarized light by the polarization conversion element 150.

In the projector 100 of the present embodiment, the light source 101 (blue laser element BL) is configured to emit s-polarized blue laser light, but it may be configured to emit p-polarized blue laser light. In that case, the characteristics of each component with respect to s-polarized light and p-polarized light are reversed.

For example, the dichroic mirror 120 is arranged so that the polarization direction of the blue laser light is p-polarized with respect to the dichroic mirror 120, and has optical characteristics of reflecting p-polarized light with respect to the blue laser light and transmitting s-polarized light. .. In that case, the p-polarized light is the first linearly polarized light, and the s-polarized light is the second linearly polarized light.

In the projector 200 of the present embodiment, the light source 101 (blue laser element BL) is configured to emit p-polarized blue laser light, but it may be configured to emit s-polarized blue laser light. In that case, the characteristics of each component with respect to p-polarized light and s-polarized light are reversed.

For example, the dichroic mirror 220 is arranged so that the polarization direction of the blue laser light is p-polarized with respect to the dichroic mirror 220, and has optical characteristics of reflecting p-polarized light with respect to the blue laser light and transmitting s-polarized light. .. In that case, the p-polarized light is the first linearly polarized light, and the s-polarized light is the second linearly polarized light.

1 Multi-projection system 10,10a, 10b Shading plate PJ, PJa, PJb, 100,200 Projector 101 Light source (first illumination light source)
102 Phosphor (second illumination light source)
103 Phase difference plate 105 Dichroic mirror (second dichroic mirror)
106 Dichroic mirror (third dichroic mirror)
120, 220 Dichroic mirror (first dichroic mirror)
150 Polarization conversion element IM, IMa, IMb image MPIM multi-projection image

Claims (4)

When one of the linearly polarized s-polarized light and the p-polarized light is the first polarized light and the other is the second polarized light, the blue laser light which is the first polarized light is the first polarized light. The first illumination light source emitted as the illumination light of
A second illumination light, which is a phosphor and contains a red band component and a green band component generated by irradiating the phosphor with the first illumination light, is emitted as a second illumination light. 2 illumination light sources and
A specific polarized light reflection region which is arranged on the optical path of the first and second illumination lights, reflects the first polarized light, and transmits the second polarized light and the second illumination light, and the first polarized light. A first dichroic mirror having a transmission region for transmitting the first and second illumination lights, and
A retardation plate, which is arranged on the optical path of the first and second illumination lights transmitted through the first dichroic mirror and converts the linearly polarized light into circularly polarized light,
Is disposed on the optical path of the transmitted through the phase difference plate of the first and second illumination light, the first polarization and is transmitted through either of the polarization of the second polarization, the other side of the polarized light A polarization conversion element that shifts the axis and aligns the first and second illumination lights with the first polarized light or the second polarized light.
Projector equipped with. Before SL phosphor diffuses the blue laser light is randomly polarized light mixed multiple polarization, be irradiated and the yellow illumination light and random polarized and have been blue laser light to the first dichroic mirror the projector according to請Motomeko 1 that. A second dichroic mirror arranged on the optical path of the first and second illumination lights transmitted through the polarization conversion element and separating the yellow illumination light and the blue illumination light which is the blue laser light.
It is arranged on the optical path of the yellow illumination light separated by the second dichroic mirror, and the yellow illumination light is separated into a red illumination light containing the red band component and a green illumination light containing the green band component. With the third dichroic mirror
The projector according to claim 2. The projector according to any one of claims 1 to 3 for projecting an image.
A shading plate that is arranged corresponding to the projector so as to block a part of the image.
With multiple
A multi-projection system that displays a plurality of images projected by the plurality of projectors as a multi-projection image by superimposing some of the regions.

Images