Projection type image display device

Abstract

To provide a projection type image display device capable of improving contrast while suppressing brightness decline and color change.SOLUTION: The projection type image display device includes: an illumination optical system that generates illumination light by combining first color laser light and second color laser light from a light source; a light modulation unit that modulates the illumination light to generate image light; and a projection optical system that enlarges and projects the image light. The light source unit is configured to reduce the difference in height between the light source image of the first color laser light and the light source image of the second color laser light is small. A relay optical system includes a reflective first diaphragm with a variable aperture diameter located at a first pupil position. The projection optical system includes an absorption type second diaphragm with a variable aperture diameter, which is located at the second pupil position conjugate to the first pupil position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a projection-type image display device, and more particularly to a configuration that uses an aperture to convert laser light from a light source into illumination light with a small divergence, thereby providing high-contrast image light. [Background technology]

[0002] Advances in solid-state light source technology are leading to the replacement of conventional discharge tube lamps as light sources for projection-type image display devices with LEDs or lasers, which have advantages such as long life, no mercury content, and no risk of explosion. Lasers in particular have a low light output from a single unit, but because the etendue of the light output is relatively small, multiple lasers arranged in an array are used as light sources, and high-output projectors with an output of over 5,000 lumens are now commercially available.

[0003] Laser units typically consist of multiple lasers densely packed in a two-dimensional array and housed in a package. While brightness is being achieved to a certain level, there is a growing demand for higher contrast in projected images to improve image quality.

[0004] However, the contrast of projection-type image display devices is inferior to that of self-luminous devices. To improve contrast, it is necessary to achieve illumination with little spread (illumination with a large F-number). However, with conventional light sources, when an illumination system with a large F-number is introduced to achieve high contrast, the light from the light source with a large spread is removed, resulting in a significant loss of brightness.

[0005] Furthermore, although image display devices are becoming smaller and more precise, the light modulated for each tiny pixel interferes with one another, resulting in stray light within the projection optical system and causing a loss of contrast. In light of this situation, the following proposals have been made in the past.

[0006] For example, in Patent Document 1, a diaphragm means is placed in either the illumination optical system or the projection optical system, and at least one of the colors red, green, and blue has a different light distribution characteristic from the other colors.When the diaphragm means is used to narrow the light, a change in the color balance in the final image occurs, but this is corrected and maintained by modulating the light source.

[0007] In addition, in Patent Document 2, apertures with variable aperture diameters are arranged in both the illumination optical system and the projection optical system, and the aperture ratio of the illumination optical system is larger than that of the projection optical system, aiming to obtain a high-contrast image. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-178080 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-285089 Summary of the Invention [Problem to be solved by the invention]

[0009] In Patent Document 1, the color of the projected image changes when the aperture is changed. While color change can be suppressed by changing the light source output, the overall color change may reach an unacceptable level, and the brightness distribution in the center and periphery generally also changes. As such, modulating the light source alone only provides a partial improvement.

[0010] In Patent Document 2, contrast can be obtained by providing variable diaphragms in both the illumination optical system and the projection optical system. However, since a single xenon tube or mercury lamp is used as the light source, the diaphragm in the illumination optical system tends to reduce brightness.

[0011] An object of the present disclosure is to provide a projection-type image display device that suppresses a decrease in brightness, suppresses color changes, and improves contrast.

[0012] The projection-type image display device of the present disclosure includes a light source unit that emits laser light of a first color, which is blue, and laser light of a second color different from blue; an illumination optical system that generates illumination light by combining the laser light of the first color and the laser light of the second color from the light source unit; a light modulation unit that modulates the illumination light from the illumination optical system in accordance with an image signal input from outside to generate image light; and a projection optical system that enlarges and projects the image light emitted from the light modulation unit onto a projection target. The light source unit includes first light source components that include a plurality of first laser light-emitting elements arranged in an array and each emits laser light of the first color; and a second light source component that includes a plurality of second laser light-emitting elements arranged in an array and each emits laser light of the second color. The area of ​​the light-emitting surface of the first light source component is different from the area of ​​the light-emitting surface of the second light source component. The illumination optical system includes a relay optical system that guides the illumination light to the light modulation unit. The light source unit further includes an optical system that changes at least one of the height of the light source image of the first color laser light and the height of the light source image of the second color laser light. The optical system of the light source unit is configured to reduce the difference in height between the light source image of the first color laser light and the height of the light source image of the second color laser light. The relay optical system includes a reflective first diaphragm with a variable aperture diameter that is arranged at a first pupil position where the illumination light is condensed. The projection optical system includes an absorptive second diaphragm with a variable aperture diameter that is arranged at a second pupil position conjugate to the first pupil position. [Effects of the Invention]

[0013] The projection-type image display device according to the present disclosure can provide a projection-type image display device that suppresses a decrease in brightness, suppresses color changes, and improves contrast. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram showing the overall configuration of a projection-type image display device according to an embodiment of the present invention; [Figure 2] A front view showing the shape of the blue laser unit and the shapes of the red and green laser units. [Figure 3]FIG. 10 is a front view showing an example of the arrangement of the red and green laser units in a comparative example; [Figure 4] FIG. 10 is an explanatory diagram illustrating the light flux distribution obtained in an example of the arrangement of the red and green laser units in a comparative example. [Figure 5] FIG. 1 is a perspective view showing an example of an arrangement of red and green laser units according to the present disclosure. [Figure 6] FIG. 10 is an explanatory diagram illustrating the luminous flux distribution obtained by an example of the arrangement of red and green laser units according to the present disclosure. [Figure 7] FIG. 1 is a perspective view showing an example of the arrangement of a blue laser unit according to the present disclosure. [Figure 8] FIG. 10 is an explanatory diagram illustrating a luminous flux distribution obtained in an example of the arrangement of the blue laser unit according to the present disclosure. [Figure 9] FIG. 10 is an explanatory diagram illustrating the distribution of light beams before entering the afocal optical system. [Figure 10] FIG. 10 is an explanatory diagram illustrating the distribution of light flux after exiting from an afocal optical system. [Figure 11] FIG. 1 is a perspective view showing an example of the configuration of an aperture unit; [Figure 12] Comparison of aperture diameters DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of well-known matters or redundant explanation of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following explanation and to facilitate understanding by those skilled in the art.

[0016] The inventor(s) provide the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and do not intend for them to limit the subject matter described in the claims.

[0017] (Embodiment) Hereinafter, embodiments will be described with reference to Figures 1 to 12. First, reference will be made to Figure 1. Figure 1 is a configuration diagram of a projection-type image display device 1 according to a first embodiment of the present disclosure.

[0018] [1-1.Configuration] As shown in FIG. 1, the projection-type image display device 1 includes a light source unit 10, an illumination optical system 20, a light modulation unit 30, a projection lens unit 138 as a projection optical system, and a control unit 50. The light source unit 10 emits laser light of a first color, which is blue, laser light of a second color, which is green different from blue, and laser light of a third color, which is red different from blue and green. The illumination optical system 20 generates illumination light by combining the blue laser light, green laser light, and red laser light from the light source unit 10. The light modulation unit 30 generates image light by modulating the illumination light from the illumination optical system 20 in accordance with an image signal input from an external device. The projection lens unit 138 enlarges and projects the image light emitted from the light modulation unit 30 onto a projection target.

[0019] Light source section 10 includes blue laser units 101a and 101b that emit blue laser light (hereinafter referred to as blue light), green laser units 102a and 102b that emit green laser light (hereinafter referred to as green light), and red laser units 103a and 103b that emit red laser light (hereinafter referred to as red light). Light source section 10 has two laser light units that emit laser light of each color, and combines these color laser light to obtain white light.

[0020] The light sources for each of the above-mentioned colors are each configured in an array, with a lens placed on the output side of the laser light source to obtain parallel light. Of these, blue lasers have a higher luminous efficiency than the other colored lights, so they can be configured with a combination of laser light sources and lenses that have fewer light-emitting elements than the other colored lights in order to ultimately obtain white light by combining them with the other colored lights. This allows for a small package size and allows for lower costs.

[0021] Please refer to FIG. 2. FIG. 2 is a front view showing a light source package, where FIG. 2(a) is a front view of blue laser units 101a and 101b, and FIG. 2(b) is a front view of green laser units 102a and 102b and red laser units 103a and 103b. In this embodiment, as shown in FIG. 2(a), blue laser units 101a and 101b each have 14 laser light-emitting elements 104a for blue light, and as shown in FIG. 2(b), green laser units 102a and 102b each have 20 laser light-emitting elements 105a and 106a for green light and red light, respectively, and red laser units 103a and 103b are arranged. The blue laser units 101a and 101b are examples of a first light source component and a fourth light source component, respectively. The green laser units 102a and 102b are examples of a second light source component and a fifth light source component, respectively. Red laser units 103a and 103b are examples of a third light source component and a sixth light source component, respectively.

[0022] Please refer to Figures 3 and 4. Figure 3 is a configuration diagram of a red laser unit or a green laser unit placed in a plane as a comparative example. Figure 4 is a diagram of the light beam arrangement in the case of Figure 3. The laser units of each color light are arranged with their light-emitting units concentrated in the center of their outer shapes. As shown in Figure 3, in the comparative example, red laser units 103a and 103b are arranged side by side with their outer shapes touching. Similarly, green laser units 102a and 102b are arranged side by side with their outer shapes touching.

[0023] In practice, a planar arrangement requires a larger gap between the light-emitting elements to avoid interference between the package outlines, and so conventional laser units have longer gaps between them. In this configuration, as shown in FIG. 4, for example, in the case of red, there is a gap of distance D1R between the light beams 103aL and 103bL from the red laser units 103a and 103b. In other words, as a light source, the light beams 103aL and 103bL, including this distance D1R, are treated as red light beam 107R. Similarly, for green, there is a gap of distance D1R between the light beams 102aL and 102bL from the green laser units 102a and 102b, and the light beams 102aL and 102bL, including this distance D1R, are treated as green light beam 107G.

[0024] On the other hand, in this embodiment, the light beams from the light sources are combined via a mirror as shown in Figure 5. Figure 5 shows the arrangement of red and green laser units according to the present disclosure.

[0025] The light beam 103aL from the red laser unit 103a and the light beam 103bL from the red laser unit 103b are reflected by mirrors 108a and 108b, respectively, and are combined and emitted from the light source unit 10 as a single red light beam 109R. Mirrors 108a and 108b are, for example, dichroic mirrors. Mirror 108a has a thin film that reflects red light formed on the lower half of its surface. Mirror 108b is the same mirror, but upside down, and has the property of reflecting red light incident on its upper half. By positioning mirrors 108a and 108b, red laser unit 103a and red laser unit 103b can be arranged so that their respective outer shapes overlap in a front or side view (see FIG. 6(b)), and so that the arrangement areas of their respective laser light-emitting elements 106a do not overlap, thereby reducing the size of the combined single light beam 107R. Mirror 108b is an example of a third mirror. Mirror 108a is an example of a sixth mirror.

[0026] Furthermore, light beam 102aL from green laser unit 102a and light beam 102bL from green laser unit 102b are reflected by mirrors 110a and 110b, respectively, and are combined and emitted from light source unit 10 as a single green light beam 109G. Mirrors 110a and 110b are, for example, partial mirrors having total reflection characteristics on either the top or bottom of their reflective surfaces. For example, mirror 110a has a total reflection surface formed on the bottom half. Mirror 110b is the same mirror, but upside down, with a total reflection surface formed on the top half. By arranging mirrors 110a and 110b, green laser unit 102a and green laser unit 102b can be arranged so that their respective outlines overlap in a front or side view (see FIG. 6(b)), and so that the arrangement areas of their respective laser light-emitting elements 105a do not overlap, thereby reducing the size of the combined single green light beam 109G. Mirror 110b is an example of a second mirror, and mirror 110a is an example of a fifth mirror.

[0027] As a result, the light source light reflected by each mirror can be arranged at intervals of a distance D2R that is sufficiently smaller than the distance D1R (FIG. 4), as shown in FIG. 6, which shows the optical paths of the light reflected by mirrors 108a and 108b as viewed from the -Y direction in FIG. 1. FIG. 6 is an explanatory diagram illustrating the light flux distribution obtained in an example arrangement of red and green laser units according to the present disclosure. FIG. 6(a) is a front view showing the light flux distribution obtained in an example arrangement of red and green laser units according to the present disclosure, and FIG. 6(b) is a side view of the red and green laser units.

[0028] Red light beam 109R formed across distance D2R can emit light with the same output as red light beam 107R including distance D1R with a smaller light beam. Therefore, distance D4R between center of gravity 103aG of light beam 103aL from red laser unit 103a and center of gravity 103bG of light beam 103bL from red laser unit 103b, which are ultimately emitted from light source unit 10, is shorter than distance D3R between center of gravity 103aF (see FIG. 4) of light beam 103aL formed by arranging the outer shapes of red laser unit 103a and red laser unit 103b in contact with each other in the spacing direction and center of gravity 103bF of light beam 103bL. This allows red light to be converted into a light beam with high optical density. In other words, the distance D4R between the center of gravity of the red laser light beam reflected by mirror 108b and the center of gravity of the red laser light beam reflected by mirror 108a is shorter than the distance D3R between the center position (center of gravity position 103aF) of red laser unit 103a and the center position (center of gravity position 103bF) of red laser unit 103b when the outer shapes of red laser unit 103a and red laser unit 103b are arranged in contact with each other.

[0029] Similarly to the red light, green light beam 109G formed across distance D2R can emit light of the same output as a green light beam including distance D1R with a smaller light beam. Therefore, distance D4R between center of gravity 102aF of light beam 102aL from green laser unit 102a, which is ultimately emitted from light source unit 10, and center of gravity 102bG of light beam 102bL from green laser unit 102b is shorter than distance D3R between center of gravity 102aF (see FIG. 4) of light beam 102aL formed by arranging the outer shapes of green laser unit 102a and green laser unit 102b in contact with each other in the spacing direction, and center of gravity 102bF of light beam 102bL. This allows green light to also be converted into a light beam with a high optical density. In other words, the distance D4R between the center of gravity of the green laser light beam reflected by mirror 110b and the center of gravity of the green laser light beam reflected by mirror 110a is shorter than the distance D3R between the center position (center of gravity position 102aF) of green laser unit 102a and the center position (center of gravity position 102bF) of green laser unit 102b when the outer shapes of green laser unit 102a and green laser unit 102b are arranged in contact with each other.

[0030] As shown in FIG. 5, green laser units 102a and 102b are, for example, the same size as red laser units 103a and 103b, and mirrors 110a and 110b having total reflection properties are arranged on either the top or bottom of the reflective surface along the same optical path, so that the light reflected by mirrors 110a and 110b is transmitted through mirrors 108a and 108b, which are red-reflecting dichroic mirrors, and the resulting green light source luminous flux is superimposed on red luminous flux 109R.

[0031] The laser units for blue and red light have different shapes, sizes, and orientations, but if the laser units are arranged on the same plane as in the past, the distance between the laser units will be large to avoid interference between the light source packages. Similarly to red and green light, blue light can be combined using mirrors 111a and 111b, which have reflective properties on only one side, to achieve a small blue light beam. Mirror 111b is an example of a first mirror. Mirror 111a is an example of a fourth mirror.

[0032] Fig. 7 is a perspective view showing an example of the arrangement of a blue laser light source according to the present disclosure. Fig. 8 is an explanatory diagram illustrating the luminous flux distribution obtained in the example of the arrangement of a blue laser unit according to the present disclosure. Fig. 8(a) is a front view showing the luminous flux distribution obtained in the example of the arrangement of a blue laser unit according to the present disclosure, and Fig. 8(b) is a side view of the blue laser unit. Thus, Fig. 7 shows an example of the arrangement of the blue light source package and mirror, and Fig. 8 shows the light source luminous flux after synthesis.

[0033] As with red light, blue light source luminous flux 112, formed across distance D6R, can emit light of the same power as a blue luminous flux including luminous fluxes 101aL and 101bL from two blue laser units 101a and 101b arranged so that their outer shapes are in contact with each other. Therefore, distance D8R between center of gravity 101aG of luminous flux 101aL from blue laser unit 101a and center of gravity 101bG of luminous flux 101bL from blue laser unit 101b, both of which are ultimately emitted from light source unit 10, is shorter than the distance between the center of gravity of luminous flux 101aL and luminous flux 102bL, formed by arranging the outer shapes of blue laser unit 101a and blue laser unit 101b in contact with each other in the spacing direction, as with red and green light. This allows blue light to be converted into a luminous flux with high optical density. In other words, the distance D8R between the center of gravity of the light beam of blue laser light reflected by mirror 111b and the center of gravity of the light beam of blue laser light reflected by mirror 111a is shorter than the distance between the center of gravity of blue laser unit 101a and the center of gravity of blue laser unit 101b when the outer shapes of blue laser unit 101a and blue laser unit 101b are placed side by side in contact with each other.

[0034] In addition, in Figures 1 and 7, since no light is transmitted through mirrors 110a and 111a, they may be mirrors that reflect all normal visible light, and for the same reason, mirrors 110b and 111b may be mirrors that partially reflect all visible light.

[0035] Illumination optical system 20 uses laser light from red laser units 103a and 103b and green laser units 102a and 102b shown in Fig. 5, and blue laser units 101a and 101b shown in Fig. 7. However, because red and green light source luminous flux 109 and blue light source luminous flux 112 are different in size, if they are combined as is, the heights of the rays incident on condenser lens 114 that condenses the light onto rod integrator 113 will be different. As a result, the red and green laser light are incident on rod integrator 113 at a larger angle than the blue laser light, resulting in an image with stronger red and green colors in the peripheral parts of the projected image than in the central part, causing color unevenness.

[0036] Therefore, in this embodiment, light source unit 10 is equipped with a blue afocal optical system 115 that aligns the heights of the blue, red, and green light beams, and a red and green afocal optical system 116. Blue afocal optical system 115 is equipped with a convex lens 115a and a concave lens 115b. Red and green afocal optical system 116 is equipped with a convex lens 116a and a concave lens 116b. The blue light emitted from blue afocal optical system 115 and the red and green light emitted from red and green afocal optical system 116 are combined by blue-transmitting dichroic mirror 117 and then enter condenser lens 114.

[0037] Please refer to FIG. 9. FIG. 9 is an explanatory diagram illustrating the light beam distribution before entering the afocal optical system. Here, the height of the light beam (light source image) may refer to the width direction, which is the direction of the minor axis DS of each laser beam constituting light beams 101aL and 101bL of blue laser light, or the length in the direction of the major axis DL. Below, an example will be described in which the width direction of the light beams is made uniform as the height of the light beam. Here, the width of the light beam entering blue afocal optical system 115 is set to BW1, the width of the light beam emitted after passing through blue afocal optical system 115 is set to BW2, and the magnification of blue afocal optical system 115 is set to BW2 / BW1. That is, blue afocal optical system 115 (an example of a first afocal optical system) changes width BW1 (the height of the light source image of blue laser light) to width BW2 (the first height).

[0038] Similarly, the width of the light beam incident on the red and green afocal optical system 116 is RGW1, the width of the light beam emitted after passing through the red and green afocal optical system 116 is RGW2, and the magnification of the red and green afocal optical system 116 is RGW2 / RGW1. That is, the red and green afocal optical system 116 (an example of a second afocal optical system) changes the width RGW1 (the height of the light source image of the green laser light) to a width RGW2 (a second height). Furthermore, the red and green afocal optical system 116 (an example of a second afocal optical system) changes the width RGW1 (the height of the light source image of the red laser light) to a width RGW2 (a second height). Here, the height of the light source of the green laser light emitted after passing through the red and green afocal optical system 116 is not necessarily the same as the height of the light source of the red laser light emitted after passing through the red and green afocal optical system 116, and may be different. The blue afocal optical system 115 and the red and green afocal optical system 116 are examples of the optical system of the light source unit 10.

[0039] Refer to Fig. 10. Fig. 10 is an explanatory diagram for explaining the light beam distribution after the afocal optical system emits light. At this time, when trying to make the height of the light ray incident on the condenser lens 114 the same, BW2 = RGW2. On the other hand, since BW1 < RGW1, the magnifications of the blue afocal optical system 115 and the red and green afocal optical systems 116 are different. Thus, the image widths BW2 of the light beams 101aL and 101bL of the blue laser light and the image widths RGW2 of the light beams 102aL, 102bL, 103aL, and 103bL of the green and red laser lights are made equal to the image widths BW1 of the light beams 101aL and 101bL and the image widths RGW1 of the light beams 102aL, 102bL, 103aL, and 103bL at the time of their respective emissions. The magnifications of the blue afocal optical system 115 and the red and green afocal optical systems 116 are different. However, the coincidence in the width direction here is an example. Depending on the light quantity distribution of each light source and the overall optical characteristics, it may be adjusted in the major axis DL direction of the laser light, or adjusted in both the minor axis DS direction and the major axis DL direction of the laser light, or adjusted so that the blue light beam spreads more than the red and green light beams in the minor axis DS direction of the laser light and the red and green light beams spread more than the blue light beam in the major axis DL direction. As described above, the blue afocal optical system 115 and the red and green afocal optical systems 116 are configured such that the difference between the width BW2 and the width RGW2 becomes small. More specifically, the blue afocal optical system 115 and the red and green afocal optical systems 116 are configured such that the difference between the width BW2 and the width RGW2 is smaller than the difference between the width BW1 and the width RGW1. Here, each of the difference between the width BW2 and the width RGW2 and the difference between the width BW1 and the width RGW1 means the absolute value of the difference.

[0040] In particular, the red and green afocal optical system 116 has a greater reduction ratio of the beam width. Note that if the blue light source is even smaller, or if the condenser lens 114 is large and configured such that BW1 = BW2, the blue afocal optical system 115 is not necessary, but the magnification of the red and green afocal optical system 116 is still smaller. Figure 10 is a diagram in which the magnifications of blue light, red, and green light are superimposed. In this way, the light source unit 10 is equipped with the blue afocal optical system 115 and the red and green afocal optical system 116, which have different magnifications.

[0041] Note that the light source unit 10 does not necessarily have to include both the blue afocal optical system 115 and the red and green afocal optical system 116. In one example, the light source unit 10 includes the blue afocal optical system 115 but does not include the red and green afocal optical system 116. In this case, since the light source unit 10 does not include the red and green afocal optical system 116, the width RGW1 is equal to the width RGW2. The blue afocal optical system 115 is configured so that the difference between the width BW2 and the width RGW2 is smaller than the difference between the width BW1 and the width RGW1. Specifically, the blue afocal optical system 115 increases the width BW1 to the width BW2, thereby reducing the difference between the width BW2 and the width RGW2. In another example, the light source unit 10 does not include the blue afocal optical system 115 but includes the red and green afocal optical system 116. In this case, the light source unit 10 does not include the blue afocal optical system 115, so the width BW1 is equal to the width BW2. The red and green afocal optical system 116 is configured so that the difference between the width BW2 and the width RGW2 is smaller than the difference between the width BW1 and the width RGW1. Specifically, the red and green afocal optical system 116 reduces the difference between the width BW2 and the width RGW2 by reducing the width RGW1 to the width RGW2.

[0042] The illumination optical system 20 includes a rod integrator 113 and a relay optical system 121. The relay optical system 121 includes a lens 118, an illumination diaphragm unit 119, a lens 123, a folding mirror 124, and a field lens 125.

[0043] Light incident on rod integrator 113 is multiple-reflected within rod integrator 113, and then passes through lens 118 to reach illumination diaphragm unit 119. Illumination diaphragm unit 119 is placed at or near the position where a light source image is formed by lens 118. This position becomes the first pupil position of relay optical system 121, which transfers the image from exit port 113a of rod integrator 113 onto an image display element.

[0044] The light transmitted through the aperture 122 of the illumination diaphragm unit 119 passes through a lens 123 and is reflected by a return mirror 124 , and then passes through a field lens 125 and enters a total reflection prism 126 .

[0045] The light modulation section 30 includes a total reflection prism 126, a color prism unit 131, and light modulation elements 137R, 137G, and 137B.

[0046] Total reflection prism 126 is composed of a first prism 127 and a second prism 128 fixed together with a small gap (air gap) maintained between them. Light incident on total reflection prism 126 is totally reflected by total reflection surface 129, and then passes through surface 130 and enters color prism unit 131.

[0047] This color prism unit 131 is configured by adhesively fixing a first prism 133 equipped with a blue-transmitting dichroic mirror surface 132 that has the property of reflecting blue light, a second prism 135 equipped with a green-transmitting dichroic mirror surface 134 that has the property of reflecting red and blue light, and a third prism 136. However, an air gap is provided between the first prism 133 and the second prism 135 in order to utilize total internal reflection.

[0048] As shown in FIG. 1, light modulation elements 137R, 137G, and 137B are arranged to face the end faces of each prism. These light modulation elements are, for example, DMDs with tiny mirrors arranged two-dimensionally. The tilt direction of the tiny mirrors is controlled in two directions in accordance with the video signal input from outside via control unit 50. Light reflected by the tiny mirrors at a tilt angle when an ON signal is received returns to color prism unit 131 at an incident angle of 0°. Light reflected by the tiny mirrors at a tilt angle when an OFF signal is received re-enters color prism unit 131 at a larger angle. Light modulation element 137B is used to modulate blue light, light modulation element 137R is used to modulate red light, and light modulation element 137G is used to modulate green light.

[0049] In the light modulation elements 137R, 137G, and 137B, the light in the white display mode in each pixel returns to the color prism unit 131, and after passing through this, passes through the second prism 128 and the first prism 127 of the total reflection prism 126 and enters the projection lens unit 138.

[0050] A projection diaphragm unit 139 is disposed at the second pupil position of the projection lens unit 138. The first pupil position where the illumination diaphragm unit 119 is disposed and the second pupil position where the projection lens unit 138 is disposed are conjugate with each other. Light incident on the projection lens unit 138 passes through an aperture 140 and reaches a screen (not shown) as a projection target. The projection lens unit 138 is detachably fixed via its projection lens flange portion 141 to a mount member 142 provided on the housing of the main body of the projection-type image display device 1 (not shown). This fixing portion can be configured with a bayonet or the like. In this way, a color display can be realized on the screen by inputting different signals to the light modulation elements 137R, 137G, and 137B according to the image signal.

[0051] The illumination diaphragm unit 119 has high reflectivity on its surface and is equipped with multiple blade members with diffusing properties. The diffuse reflection of the illumination diaphragm unit 119 is achieved by a matte finish on the surface and a stucco pattern finish with many randomly arranged irregularities. This prevents the diaphragm itself from generating heat even when exposed to strong light, and by diffusing the reflected light, it can be focused at any desired position and prevent heat generation or burning of other components.

[0052] However, even highly reflective materials absorb heat, so materials with excellent thermal conductivity, such as aluminum or copper, are used to prevent burns. Thus, the illumination diaphragm unit 119 of the illumination optical system 20 is composed of multiple movable blade members made of materials that have been treated to have high thermal conductivity and high reflectivity, and their surfaces are diffusely reflective. In one example, the multiple blade members primarily diffusely reflect 70% or more of the light incident on them. In another example, the multiple blade members diffusely reflect 80% or more of the light incident on them.

[0053] These diaphragms are driven by actuators connected via cams under the control of the control unit 50 of the main body 3, so that the diameter of the opening 122 of the illumination diaphragm unit 119 can be set arbitrarily. An example of the specific structure of the illumination diaphragm unit 119 is shown in FIG. 11. FIG. 11 is a perspective view showing an example of the structure of the illumination diaphragm unit 119 and the projection lens unit 138.

[0054] The illumination diaphragm unit 119 has a stepping motor 143 as an actuator, a slip clutch 144 on its output shaft, and a connecting gear 145, which is connected to a fan-shaped gear 146 extending from an diaphragm cam (not shown) to move a plurality of diaphragm blades 147 in accordance with the amount of rotation of the stepping motor 143, thereby controlling the diaphragm diameter of the aperture 122. In addition, a front plate 148 made of highly reflective aluminum is provided on the incident side. This front plate 148 may also be light-diffusing treated.

[0055] Similarly, the projection diaphragm unit 139 of the projection lens unit 138 also has multiple diaphragm blades 147 driven via a cam, allowing the diameter of the opening 140 to be varied by control from the main body side. Unlike the illumination diaphragm unit 119, the surfaces of the diaphragm blades 147 of the projection lens unit 138 are treated with a heat-resistant black coating. This reduces the generation of stray light within the projection lens unit 138. As such, the projection diaphragm unit 139 includes a material that has been treated with a light-absorbing coating and has multiple movable diaphragm blades 147. In one example, the multiple diaphragm blades 147 absorb 90% or more of the visible light that enters the multiple diaphragm blades 147. In another example, the multiple diaphragm blades 147 absorb 95% or more of the visible light that enters the multiple diaphragm blades 147. Furthermore, the F-number of the illumination optical system 20, which is determined by the illumination aperture unit 119, and the F-number of the projection lens unit 138 (projection optical system), which is determined by the projection aperture unit 139, are such that the F-number of the illumination optical system 20 is always greater than or equal to the F-number of the projection lens unit 138, thereby reducing the thermal load on the projection aperture unit 139.

[0056] Illumination optical system F-number ≧ Projection optical system F-number As described above, the projection lens unit 138 is an interchangeable lens type. Therefore, when the projection lens unit 138 is removed from the main body 3 of the projection image display device 1, or when it is installed in a main body other than a main body 3 that satisfies the functions of the present disclosure, the aperture diameter of the projection aperture unit 139 is in a first state set to a first aperture diameter PD1. In other words, when the projection lens unit 138 is removed from the main body 3 of the projection image display device 1 and is not controlled externally, the aperture diameter of the projection aperture unit 139 is set to the first aperture diameter PD1. When it is installed in a main body 3 that satisfies the functions of the present disclosure, the aperture diameter of the projection aperture unit 139 is in a second state set to a second aperture diameter PD2. When it is installed in a main body 3 that satisfies the functions of the present disclosure and controlled to narrow the aperture, the aperture diameter of the projection aperture unit 139 is set to a third aperture diameter PD3. The first aperture diameter PD1, the second aperture diameter PD2, and the third aperture diameter PD3 are configured to satisfy the following relationship:

[0057] First aperture diameter PD1 > Second aperture diameter PD2 > Third aperture diameter PD3 FIG. 12 shows a comparison of aperture diameters. FIG. 12(a) shows the first aperture diameter PD1 in the first state, FIG. 12(b) shows the second aperture diameter PD2 in the second state, and FIG. 12(c) shows the third aperture diameter PD3 in the third state. The first aperture diameter PD1 in the first state and the second aperture diameter PD2 in the second state are predetermined. The control unit 50 in the main body 3 controls the third aperture diameter PD3 to be set to any desired value when switching from the second state to the third state. By further narrowing the aperture diameter of the projection aperture unit 139 from the second state, the amount of projected light decreases, but the contrast can be increased. Therefore, depending on how the projection-type image display device 1 is used, such as the projection size and ambient brightness, if a higher contrast than that in the second state is desired, the third aperture diameter PD3 can be set to any desired value to obtain the desired contrast. That is, the projection aperture unit 139 is configured to change from the second state to a third state in which the projection aperture unit 139 is set to a third aperture diameter PD3 that is smaller than the second aperture diameter PD2. The third aperture diameter PD3 is set to an arbitrary size smaller than the second aperture diameter PD2 under the control of the control unit 50 in the main body 3.

[0058] As described above, when the projection lens unit 138 is attached to a projector body other than the one disclosed herein, and the illumination diaphragm unit 119 is not included, the blades of the projection diaphragm unit 139 may be damaged by heat if exposed to image light. When the projection lens unit 138 is attached to a body 3 that satisfies the functions of the present disclosure, the illumination light is narrowed by the illumination diaphragm unit 119, so that the blades of the projection diaphragm unit 139 can be prevented from being damaged by heat even if the second aperture diameter PD2 is smaller than the first aperture diameter PD1. Therefore, the first aperture diameter PD1 and the second aperture diameter PD2 have the relationship described above. In other words, the projection diaphragm unit 139 is configured so that the first aperture diameter PD1 in the first state is always larger than the second aperture diameter PD2 in the second state.

[0059] In the case of a set according to the present disclosure, between the set main body 3 and the projection lens unit 138, and between the mount member 142 and the projection lens flange portion 141 of the projection lens unit 138, a transition to the second opening diameter PD2 occurs by mechanical or electrical action when the set is attached, whereas in the case of other sets, the first opening diameter PD1 is maintained even when the set is attached, as no such action occurs.

[0060] Regarding the detection of attachment / detachment of the main body 3 and the projection lens unit 138 and the diaphragm drive, as described above, electrical contacts may be provided on both the main body 3 and the projection lens unit 138 for drive, or a mechanical structure that operates only when the main body 3 is equipped with the functions of the present disclosure may be provided. In this case, this can be realized by making the projection diaphragm driveable. The basic structure of the projection diaphragm unit 139 is the same as that of the illumination diaphragm unit 119, but since it must be housed within the projection lens unit 138, a smaller actuator may be used and the connecting gears may also be small and configured in an arrangement following a circular shape.

[0061] In this way, when the projection lens unit 138 is attached to the projection-type image display device 1, the projection lens unit 138 can set the opening diameter of the projection aperture unit 139 through mechanical or electrical operation control from the main body 3 of the projection-type image display device 1.

[0062] [1-2. Effects, etc.] As described above, the projection-type image display device 1 according to the present embodiment includes a light source unit 10 that emits laser light of a first color, which is blue, and laser light of a second color, which is green and different from blue, an illumination optical system 20 that generates illumination light by combining the laser light of the first color and the laser light of the second color from the light source unit 10, a light modulation unit 30 that generates image light by modulating the illumination light from the illumination optical system 20 in accordance with an image signal input from outside, and a projection lens unit 138 that enlarges and projects the image light emitted from the light modulation unit 30 onto a projection target. The light source unit 10 includes blue laser units 101a and 101b in which a plurality of blue laser light-emitting elements, each emitting blue laser light, are arranged in an array, green laser units 102a and 102b in which a plurality of green laser light-emitting elements, each emitting green laser light, are arranged in an array, and red laser units 103a and 103b in which a plurality of red laser light-emitting elements, each emitting red laser light, are arranged in an array. The area of ​​the light-emitting surface of blue laser units 101a and 101b is different from the area of ​​the light-emitting surface of green laser units 102a and 102b and red laser units 103a and 103b. Illumination optical system 20 includes a relay optical system 121 that guides illumination light to light modulation unit 30. Relay optical system 121 includes a blue afocal optical system 115 and a red and green afocal optical systems 116 with different magnifications for the blue, green, and red laser light, respectively, at a first pupil position where the illumination light is focused, so that the heights of the light source images of the blue, green, and red laser light are equal to the heights at which they are emitted from the respective laser units. Relay optical system 121 includes a reflective illumination diaphragm unit 119 with a variable aperture diameter at the first pupil position. Projection lens unit 138 includes an absorptive projection diaphragm unit 139 with a variable aperture diameter at a second pupil position conjugate to the first pupil position.

[0063] The above-described configuration, including a high F-number illumination and projection lens unit, not only achieves high contrast (i.e., the brightness ratio between white and black across the entire projection area) but also high contrast in window contrast, which displays a small area of ​​black within a white screen. The latter, in particular, achieves superior performance compared to conventional systems because reflected light and stray light within the projection optical system, particularly the projection lens unit 138, can cause degradation. In addition, since the light source unit 10 is a laser with a small light spread, the spread of illumination light in the illumination optical system 20 can be minimized. Even with a high F-number, the illumination diaphragm unit 119 and the projection diaphragm unit 139 are less likely to reduce brightness than conventional systems. Furthermore, since the relay optical system 121 includes afocal optical systems 115 and 116 with different magnifications, the intensity distribution within the pupil of the illumination optical system 20 for each color of light is approximately the same. Therefore, even when the illumination diaphragm unit 119 further narrows the aperture 122 in conjunction with the projection diaphragm unit 139 of the projection lens unit 138 to achieve higher contrast, the balance between the colors remains unchanged, providing an image without color shift.

[0064] The light-emitting surface areas of blue laser units 101a and 101b are smaller than those of green laser units 102a and 102b and red laser units 103a and 103b. This causes the amount of blue light to concentrate in the central region. When combined with the green and red laser light in this state, the combined light will have a bluish tinge in the central region and a lack of blue in the peripheral regions. In this state, if the illumination light is narrowed by illumination diaphragm unit 119 and the image light is narrowed by projection diaphragm unit 139, the color may change due to vignetting of surrounding light, depending on the degree of narrowing. In response to this, optical systems with different magnifications are provided for each laser light so that the heights of the light source images of the blue, green, and red laser light are equal to the heights at which they are emitted from the respective laser units. This reduces the concentration of the blue light in the central region and reduces color changes due to vignetting of light. It should be noted that "so that the heights of the light source images of the blue, green, and red laser light become equal to each other compared to the heights at which they are emitted from their respective laser units" does not only mean that they are completely equal, but also includes cases where the heights of the light source images of the blue, green, and red laser light become closer to each other compared to the heights at which they are emitted from their respective laser units.

[0065] (Other embodiments) As described above, the above-described embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the above-described embodiments to create new embodiments.

[0066] In this embodiment, the light beams of each color light are arranged at a high density by devising an arrangement of the laser unit, which is the light source, and the mirrors, but the means is not limited to this, and the same effect can be expected even if a prism is used, as long as the afocal optical diameter magnification is changed depending on the color light and the final light source image size (height of the light beam from the optical axis) is converted to a similar value.

[0067] In the embodiment, the light modulation unit 30 is a system equipped with three DMD devices as light modulation elements, but it can also be applied to a one-chip system using one DMD, or a system using three LCD panels. However, the mainstream LCD panel system uses an integrator composed of a microlens array, and in this case, the same effect can be obtained by placing an illumination diaphragm near the exit side microlens array as the pupil position.

[0068] In the embodiment, the light source unit 10 includes a blue laser unit, a green laser unit, and a red laser unit, which respectively emit blue laser light, green laser light, and red laser light, but is not limited to this. The light source unit 10 may also include a blue laser unit and a green laser unit, or a blue laser unit and a red laser unit, and be configured to emit two colors of laser light.

[0069] As described above, the embodiments have been described as examples of the technology of the present disclosure. For this purpose, the accompanying drawings and detailed description have been provided. Therefore, the components described in the accompanying drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the above technology. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not be interpreted as immediately indicating that these non-essential components are essential.

[0070] Furthermore, since the above-described embodiments are intended to illustrate the technology of the present disclosure, various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[0071] (Outline of the embodiment) (1) A projection-type image display device according to the present disclosure includes a light source unit that emits laser light of a first color, which is blue, and laser light of a second color different from blue; an illumination optical system that generates illumination light by combining the laser light of the first color and the laser light of the second color from the light source unit; a light modulation unit that generates image light by modulating the illumination light from the illumination optical system in accordance with an image signal input from outside; and a projection optical system that enlarges and projects the image light emitted from the light modulation unit onto a projection target. The light source unit includes a first light source component having a plurality of first laser light-emitting elements arranged in an array, each of which emits laser light of the first color; and a second light source component having a plurality of second laser light-emitting elements arranged in an array, each of which emits laser light of the second color. The area of ​​the light-emitting surface of the first light source component is different from the area of ​​the light-emitting surface of the second light source component. The illumination optical system includes a relay optical system that guides the illumination light to the light modulation unit. The relay optical system includes an optical system with different magnifications for the laser light of the first color and the laser light of the second color at a first pupil position where the illumination light is collected, so that the heights of the light source images of the laser light of the first color and the laser light of the second color are equal to the heights at which they are emitted. The relay optical system includes a first reflective diaphragm with a variable aperture diameter at the first pupil position. The projection optical system includes a second absorptive diaphragm with a variable aperture diameter at a second pupil position conjugate to the first pupil position.

[0072] This makes it possible to obtain high contrast and also reduce reflected light and stray light within the projection optical system. Furthermore, because the light source is a laser with a small spread, the spread of illumination light in the illumination optical system can be minimized, and brightness is less likely to decrease even with a high F-number compared to conventional systems. Furthermore, because the relay optical system is equipped with optical systems with different magnifications, the intensity distribution within the pupil of the illumination optical system for each color of light is almost the same. Therefore, even when the illumination aperture is further narrowed in conjunction with the aperture of the projection lens unit to obtain higher contrast, the balance between each color does not change, and an image with no color shift can be provided.

[0073] (2) In the projection-type image display device of (1), the light source unit emits laser light of a third color different from the first and second colors, and the illumination optical system generates illumination light by combining the laser light of the first color, the laser light of the second color, and the laser light of the third color. The light source unit includes a third light source component in which a plurality of third laser light-emitting elements, each emitting a laser light of the third color, are arranged in an array. The area of ​​the light-emitting surface of the first light source component is different from the area of ​​the light-emitting surface of at least one of the second light source component and the third light source component. The optical system of the relay optical system is configured such that the magnification of at least the laser light of the first color is different from the magnification of the laser light of the second color or the third color so that the heights of the light source images of the laser light of the first color, the second color, and the third color are equal to each other at the first pupil position where the illumination light is focused.

[0074] (3) In the projection-type image display device of (1) or (2), the projection optical system is a projection lens unit that is detachable from the main body of the projection-type image display device. The projection lens unit is equipped with a second diaphragm, and when the second diaphragm is not controlled externally, the second diaphragm is in a first state in which it is set to a first aperture diameter, and when the projection lens unit is attached to a specific projector, the second diaphragm is in a second state in which it is set to a second aperture diameter. The aperture diameters of the second diaphragm in the first state and the second state are controlled so that the aperture diameter in the first state is always greater than the aperture diameter of the diaphragm in the second state.

[0075] (4) In the projection-type image display device of (3), when the projection lens unit is attached to a predetermined projection-type image display device, the second diaphragm of the projection lens unit is changeable, under control of the main body of the projection-type image display device, to a third state in which the second diaphragm is set to a third aperture diameter, in addition to a second state in which the second diaphragm is set to a second aperture diameter. The aperture diameters of the second diaphragm in the first, second, and third states have the relationship aperture diameter in the first state > aperture diameter in the second state > aperture diameter in the third state, and the third aperture diameter of the second diaphragm can be set to any size from the second state to the third state under control of the main body.

[0076] (5) In the projection type image display device of (4), when the projection lens unit is attached to the projection type image display device, the projection lens unit can set the aperture diameter of the second diaphragm by mechanical operation control or electrical operation control from the main body of the projection type image display device.

[0077] (6) In any one of the projection-type image display devices (1) to (5), the first aperture of the illumination optical system is composed of a plurality of movable blades made of a material that has been treated to have high thermal conductivity and high reflectivity, and its surface is a diffuse reflection surface.

[0078] (7) In the projection type image display device of any one of (3) to (5), the second diaphragm of the projection lens unit includes a material that has been subjected to a light absorbing treatment and has a plurality of movable blades.

[0079] (8) In the projection type image display device of any one of (1) to (7), the illumination optical system is provided with afocal optical systems with different magnifications.

[0080] (9) In the projection type image display device of (8), the afocal optical system provided in the optical path of at least the first color has a different magnification from the afocal optical systems provided in the optical paths of the other colors.

[0081] (10) In any one of the projection-type image display devices (1) to (9), the first color laser light emitted from the light source unit is emitted together with the first color laser light emitted from each of a plurality of first light source components, and the spacing between the center of gravity positions of the respective light beams from the plurality of first light source components is shorter than the spacing formed when the outer shapes of each of the first light source components are lined up in contact with each other in the spacing direction.

[0082] (11) In any one of the projection-type image display devices (1) to (10), the second color laser light emitted from the light source unit is emitted together with the second color laser light emitted from each of a plurality of second light source components, and the spacing between the center of gravity positions of the respective light beams from the plurality of second light source components is shorter than the spacing formed when the outer shapes of each of the second light source components are lined up in contact with each other in the spacing direction.

[0083] (12) In the projection-type image display device of (2), the third color laser light emitted from the light source unit is emitted together with the third color laser light emitted from each of the multiple third light source components, and the distance between the center of gravity positions of the respective light beams from the multiple third light source components is shorter than the distance formed when the outer shapes of each of the third light source components are lined up in contact with each other in the spacing direction. [Industrial Applicability]

[0084] The present disclosure is applicable to projection display devices that use laser light as a light source. [Explanation of symbols]

[0085] 1 Projection-type image display device 10 Light source section 20 Illumination optical system 30 Optical modulation section 50 control section 101a, 101b Blue laser unit 102a, 102b Green laser unit 103a, 103b Red laser unit 104a Laser light emitting element 105a Laser light emitting element 106a Laser light emitting element 107G, 109G green light beam 107R, 109R red luminous flux 108a, 108b mirrors 110a, 110b, 111a, 111b mirrors 112 Light source luminous flux 113 Rod Integrator 113a Output port 114 Condenser Lens 115 Afocal optical system for blue 115a Convex lens 115b Concave lens 116 Red and green afocal optical system 116a Convex lens 116b Concave lens 117 Blue transmitting dichroic mirror 118 Lens 119 Lighting aperture unit 121 Relay Optical System 122 Aperture 123 Lens 124 Folding Mirror 125 Field Lens 126 Total Reflection Prism 127 First Prism 128 Second Prism 129 Total reflection surface 130 First Prism Face 131 Color Prism Unit 132 Blue transmitting dichroic mirror surface 133 First Prism 134 Green transmitting dichroic mirror surface 135 Second Prism 136 The Third Prism 137R, 137G, 137B Optical Modulation Elements 138 Projection lens unit 139 Projection diaphragm unit 141 Projection lens flange 142 Mounting material 143 Stepping motor 144 Slip Clutch 145 gears 146 Sector Gear 147 aperture blades 148 Front Plate

Claims

1. a light source unit that emits a laser beam of a first color, which is blue, and a laser beam of a second color different from blue; an illumination optical system that generates illumination light by combining the laser light of the first color and the laser light of the second color from the light source unit; an optical modulation unit that modulates illumination light from the illumination optical system in accordance with an image signal input from outside to generate image light; a projection optical system that enlarges the image light emitted from the light modulation unit and projects the image light onto a projection target, The light source unit is a first light source component including a plurality of first laser light-emitting elements arranged in an array, each of which emits a laser beam of the first color; a second light source component including a plurality of second laser light-emitting elements arranged in an array, each of which emits a laser beam of the second color; the area of ​​the light emitting surface of the first light source component is different from the area of ​​the light emitting surface of the second light source component; the illumination optical system includes a relay optical system that guides the illumination light to the light modulation unit, the light source unit further includes an optical system that changes at least one of a height of a light source image of the laser light of the first color and a height of a light source image of the laser light of the second color; an optical system of the light source unit is configured such that a magnification for changing the height of the light source image of the first color laser light and a magnification for changing the height of the light source image of the second color laser light are different from each other so that a difference between a height of the light source image of the first color laser light and a height of the light source image of the second color laser light is small; the relay optical system includes a first reflective diaphragm having a variable aperture diameter and disposed at a first position where the illumination light is condensed; the projection optical system includes a second diaphragm of an absorptive type having a variable aperture diameter, the second diaphragm being disposed at a second position conjugate to the first position; the aperture diameter of the second aperture is equal to or larger than the aperture diameter of the first aperture; Projection-type image display device.

2. the light source unit emits laser light of a third color different from the first color and the second color, the illumination optical system generates the illumination light by combining the first color laser light, the second color laser light, and the third color laser light; the light source unit further includes a third light source component including a plurality of third laser light-emitting elements arranged in an array, each of which emits the laser light of the third color; the area of ​​the light emitting surface of the first light source component is different from the area of ​​the light emitting surface of the third light source component; the optical system of the light source unit changes the height of a light source image of the third color laser light, the optical system of the light source unit is configured such that a magnification for changing the height of the light source image of the first color laser light and a magnification for changing the height of the light source image of the third color laser light are different from each other so that a difference in height between the light source image of the first color laser light and the light source image of the third color laser light is small.

2. The projection-type image display device according to claim 1.

3. the projection optical system is a projection lens unit that is detachable from the main body of the projection-type image display device, the projection lens unit includes the second diaphragm, When the second diaphragm is not externally controlled, the second diaphragm is in a first state in which the second diaphragm is set to a first opening diameter; When the projection lens unit is attached to a predetermined projector, the second diaphragm is set to a second state in which the second diaphragm is set to a second aperture diameter, the second aperture is configured such that the first opening diameter in the first state is always larger than the second opening diameter in the second state.

2. The projection-type image display device according to claim 1.

4. the second diaphragm is configured to be changed from the second state to a third state in which a third aperture diameter is set to a third aperture diameter smaller than the second aperture diameter, the third opening diameter is set to an arbitrary size smaller than the second opening diameter by control from the main body; 4. The projection type image display device according to claim 3.

5. With the projection lens unit attached to the projection-type image display device, the aperture diameter of the second diaphragm is set by mechanical or electrical operation control from the main body of the projection-type image display device.

5. The projection type image display device according to claim 4.

6. The first aperture is It has a plurality of movable blades, the movable blades primarily diffusely reflect 70% or more of light incident on the movable blades; 2. The projection-type image display device according to claim 1.

7. The second aperture is It has a plurality of movable blades, the movable blades absorb 90% or more of visible light incident on the movable blades; 2. The projection-type image display device according to claim 1.

8. The optical system of the light source unit is a first afocal optical system that changes the height of a light source image of the first color laser light to a first height; a second afocal optical system that changes the height of a light source image of the second color laser light to a second height, the first afocal optical system and the second afocal optical system are configured such that a difference between the first height and the second height is smaller than a difference between a height of a light source image of the laser light of the first color before it is incident on the first afocal optical system and a height of a light source image of the laser light of the second color before it is incident on the second afocal optical system.

2. The projection-type image display device according to claim 1.

9. the illumination optical system further includes a dichroic mirror that combines the first color laser light and the second color laser light, the first afocal optical system is disposed between the first light source component and the dichroic mirror; the second afocal optical system is disposed between the second light source component and the dichroic mirror; 9. The projection-type image display device according to claim 8.

10. the optical system of the light source unit includes a first afocal optical system that changes the height of a light source image of the first color laser light to a first height; the first afocal optical system is configured so that a difference between the first height and a height of a light source image of the second color laser light is smaller than a difference between a height of a light source image of the first color laser light before being incident on the first afocal optical system and a height of a light source image of the second color laser light.

2. The projection-type image display device according to claim 1.

11. the optical system of the light source unit includes a second afocal optical system that changes the height of a light source image of the second color laser light to a second height; the second afocal optical system is configured so that a difference between a height of a light source image of the first color laser light and the second height is smaller than a difference between a height of a light source image of the first color laser light and a height of a light source image of the second color laser light before being incident on the second afocal optical system.

2. The projection-type image display device according to claim 1.

12. The light source unit is a fourth light source component including a plurality of fourth laser light-emitting elements arranged in an array, each of which emits a laser beam of the first color; a first mirror that reflects the laser light of the first color emitted from the first light source component; a fourth mirror that reflects the laser light of the first color emitted by the fourth light source component, a distance between a center of gravity of the luminous flux of the laser light of the first color reflected by the first mirror and a center of gravity of the luminous flux of the laser light of the first color reflected by the fourth mirror is shorter than a distance between a center of gravity of the first light source component and a center of gravity of the fourth light source component when the outer shapes of the first light source component and the fourth light source component are arranged in contact with each other; 2. The projection-type image display device according to claim 1.

13. The light source unit is a fifth light source component including a plurality of fifth laser light-emitting elements arranged in an array, each of which emits the second color laser light; a second mirror that reflects the second color laser light emitted by the second light source component; a fifth mirror that reflects the second color laser light emitted by the fifth light source component, a distance between a center of gravity of the luminous flux of the laser light of the second color reflected by the second mirror and a center of gravity of the luminous flux of the laser light of the second color reflected by the fifth mirror is shorter than a distance between a center of gravity of the second light source component and a center of gravity of the fifth light source component when the outer shapes of the second light source component and the fifth light source component are arranged in contact with each other; 2. The projection-type image display device according to claim 1.

14. The light source unit is a sixth light source component including a plurality of sixth laser light-emitting elements arranged in an array, each of which emits a laser beam of the third color; a third mirror that reflects the laser light of the third color emitted from the third light source component; a sixth mirror that reflects the third color laser light emitted by the sixth light source component, a distance between a center of gravity of the light beam of the third color laser light reflected by the third mirror and a center of gravity of the light beam of the third color laser light reflected by the sixth mirror is shorter than a distance between a center of gravity of the third light source component and a center of gravity of the sixth light source component when the outer shapes of the third light source component and the sixth light source component are arranged in contact with each other; 3. The projection-type image display device according to claim 2.

15. the second color is green; the third color is red; 3. The projection-type image display device according to claim 2.

16. The area of ​​the light emitting surface of the first light source component is smaller than the area of ​​the light emitting surface of the second light source component.

2. The projection-type image display device according to claim 1.

17. the relay optical system further includes a lens that focuses the illumination light at the first position.

2. The projection-type image display device according to claim 1.

Images