Lighting device

Abstract

This lighting device is provided with: a light-emitting unit that emits light in a first wavelength band; a phase modulation unit that performs spatial optical phase modulation on incident light from the light emitting unit; a wavelength conversion unit that emits light in a second wavelength band different from the first wavelength band by performing wavelength conversion on incident light from the phase modulation unit; and a lens optical system that guides the emitted light from the wavelength conversion unit to the projection lens, in which the phase modulation unit generates a reproduced image formed in the wavelength conversion unit as a reproduced image of a first wavelength band, and the lens optical system forms a reproduced image of the second wavelength band in the optical path using the projection lens based on the light emitted from the wavelength conversion unit.

Description

Technical Field

[0001] This technology relates to an illumination technique in which a wavelength conversion unit performs wavelength conversion on a reproduced image generated by performing spatial light phase modulation on incident light from a light-emitting unit, and a projection lens projects the image onto it. Background Technology

[0002] The technique of generating an image (reconstructed image) with a desired light intensity distribution on a predetermined image plane by spatial light phase modulation is known.

[0003] For example, a liquid crystal panel is used as a phase modulator to perform spatial light phase modulation. When the driving state of a pixel in the phase modulator (e.g., the orientation state of liquid crystal molecules) changes, the amount of phase modulation (phase retardation) of the incident light at the pixel changes. At this time, if the driving state of the pixel changes, the diffraction angle of the light incident on the pixel changes. Therefore, the phase modulator can set the emission angle of the emitted light, i.e., the amount of light bending of each pixel, by setting the amount of phase modulation of each pixel. By setting the amount of light bending of each pixel in this way, it is possible to make some areas of the image plane denser and others sparser, thereby forming a desired light intensity distribution on the image plane. That is, a reproduced image with a desired light intensity distribution can be generated.

[0004] Spatial light intensity modulation is another example of spatial light modulation used to generate reconstructed images. In spatial light intensity modulation, a reconstructed image with a desired light intensity distribution is generated by using an intensity modulator configured to change the transmittance or reflectance of each pixel relative to the incident light.

[0005] Unlike image generation via spatial light intensity modulation, image generation via spatial light phase modulation, as described above, does not require the absorption or reflection of a portion of the incident light when generating an image with a desired light intensity distribution. Therefore, it has the advantage of improving incident light utilization efficiency.

[0006] Here, for an illumination device that projects light modulated by spatial light through a projection lens, it is also conceivable to use a configuration that converts the wavelength of light modulated by spatial light and projects the converted light through a projection lens.

[0007] For example, Patent Document 1 below discloses a technique in which a spatial light modulator controls the phase distribution of a modulated laser to irradiate a phosphor, and mixes the fluorescence and the laser together and projects it through a projection lens to change the light distribution pattern.

[0008] Furthermore, Patent Document 2 below discloses a technique for generating an excitation light pattern by using a spatial light modulator, which is used as a hologram, to irradiate a phosphor, and to project a light pattern from the phosphor.

[0009] Reference List

[0010] Patent documents

[0011] Patent Document 1: WO 2018 / 179093

[0012] Patent Document 2: Japanese Patent Publication No. 2021-57147 Summary of the Invention

[0013] Technical issues

[0014] Here, the fluorescence emission is essentially completely diffused. Therefore, if the light utilization efficiency in an illumination device such as those described in Patent Document 1 or 2 increases, the numerical aperture (NA) of the projection lens increases, and the size and weight of the illumination device increase.

[0015] Furthermore, as the NA of the projection lens increases, aberrations in the projection lens can lead to a decrease in the resolution of the projected image.

[0016] This technology has been made under the above circumstances, and the purpose of this technology is to enable the reduction of the NA of the projection lens in the lighting device, thereby reducing the size and weight of the lighting device and improving the resolution of the projected image. The reproduced image generated by the lighting device through spatial light phase modulation of the incident light from the light-emitting unit is wavelength converted by the wavelength conversion unit and projected by the projection lens.

[0017] Solution to the problem

[0018] The lighting device according to the present technology includes: a light-emitting unit that emits light in a first wavelength band; a phase modulation unit that performs spatial light phase modulation on the incident light from the light-emitting unit; a wavelength conversion unit that wavelength-converts the incident light from the phase modulation unit to emit light in a second wavelength band different from the first wavelength band; and a lens optical system that guides the emitted light from the wavelength conversion unit to a projection lens, wherein the phase modulation unit generates a reproduced image formed in the wavelength conversion unit as a reproduced image of the first wavelength band, and the lens optical system forms a reproduced image of the second wavelength band in the optical path between the projection lens and the lens optical system based on the emitted light from the wavelength conversion unit.

[0019] That is, the reproduced image of the second wavelength band obtained by wavelength conversion through the wavelength conversion unit is not directly magnified and projected by the projection lens. Instead, the reproduced image of the second wavelength band is formed once in front of the projection lens, and then magnified and projected by the projection lens. Therefore, compared with the case where the reproduced image of the second wavelength band obtained by wavelength conversion through the wavelength conversion unit is directly magnified and projected by the projection lens, the numerical aperture (NA) of the projection lens can be reduced. Attached Figure Description

[0020] Figure 1 This is a diagram showing an example of the configuration of a lighting device as a first embodiment.

[0021] Figure 2 This is a diagram showing the light path to the center of the reproduced image in the lighting device of the first embodiment.

[0022] Figure 3 This is a diagram showing the configuration of a lens optical system as a comparative example.

[0023] Figure 4 This is a diagram showing an example of the configuration of a lighting device as a variation of the first embodiment.

[0024] Figure 5 This is a diagram showing an example of the configuration of a lighting device as a second embodiment.

[0025] Figure 6 This is a front view of the wavelength conversion element of the lighting device according to the second embodiment.

[0026] Figure 7 This is a timing diagram showing the operation of the wavelength conversion unit, phase modulator, and light-emitting unit in the second embodiment.

[0027] Figure 8 This is a diagram showing an example of the configuration of a lighting device as a third embodiment.

[0028] Figure 9 This is a front view of the wavelength conversion element of the lighting device according to the third embodiment.

[0029] Figure 10 This is a timing diagram showing the operation of the wavelength conversion unit, phase modulator, and light emission unit in the third embodiment.

[0030] Figure 11 This is a diagram showing an example of the configuration of the lighting device as a fourth embodiment.

[0031] Figure 12 This is a diagram illustrating an example of dividing the phase modulation unit into regions in the fourth embodiment.

[0032] Figure 13 This is a timing diagram showing the operation of the phase modulator and the light-emitting unit in the fourth embodiment.

[0033] Figure 14 This is a diagram showing an example of the structure of a red laser.

[0034] Figure 15 This is a diagram showing an example of the configuration of the lighting device as a fifth embodiment.

[0035] Figure 16 This is an explanatory diagram of a wavelength conversion unit as a variation.

[0036] Figure 17 This is a diagram showing an example of the configuration of a lighting device as a variation. Detailed Implementation

[0037] In the following description, embodiments according to the present technology will be described in the following order with reference to the accompanying drawings.

[0038] <1. First Implementation Method>

[0039] <2. Second Implementation Method>

[0040] <3. Third Implementation Method>

[0041] <4. Fourth Implementation Method>

[0042] <5. Fifth Implementation Method>

[0043] <6. Variations>

[0044] <7. Overview of Implementation Methods>

[0045] <8. This technology>

[0046] <1. First Implementation Method>

[0047] Figure 1 This is a diagram showing an example of the configuration of a lighting device 1 according to the present technology as a first embodiment.

[0048] As shown in the figure, the lighting device 1 includes a light-emitting unit 2, a collimating lens 3, a phase modulator 4, a reflector 5, a collimating lens 6, a dichroic mirror 7, a wavelength conversion unit 8, a lens optical system 9, a projection lens 10, and a control unit 11.

[0049] The light-emitting unit 2 emits light of a first wavelength band. The light-emitting unit 2 includes one or more light-emitting elements. For example, a semiconductor laser or a light-emitting diode (LED) can be used as the light-emitting element.

[0050] In this example, for instance, suppose that the light in the first wavelength band emitted by the light-emitting unit 2 is blue (B) light.

[0051] The collimating lens 3 focuses the light emitted by the light-emitting unit 2 and emits parallel light.

[0052] Phase modulator 4 performs spatial light phase modulation on the incident light from collimating lens 3 (i.e., the incident light from light-emitting unit 2 through collimating lens 3).

[0053] In this embodiment, the reflective liquid crystal panel is used as the phase modulator 4.

[0054] As is well known, the emission direction of incident light can be changed pixel by pixel to the desired direction according to spatial light phase modulation. This allows the incident light to be focused onto the desired location, i.e., to form an image at the desired location. Furthermore, as mentioned above, setting the amount of light bending for each pixel can make some areas of the image plane denser with light and other areas sparser with light, thereby forming the desired light intensity distribution on the image plane. That is, a reproduced image with the desired light intensity distribution can be generated.

[0055] It should be noted that, as mentioned above, the amount of light bending in each pixel can be adjusted by changing the phase modulation amount of each pixel, specifically the driving state of the pixel (or, in the case of a liquid crystal panel, the orientation state of the liquid crystal molecules).

[0056] In this example, the spatial light phase modulation performed by the phase modulator 4 has the effect of focusing the incident light, so that the incident light from the light-emitting unit 2 is focused once in the optical path between the reflector 5 and the phase modulator 4. That is, in this example, the reconstructed image of the first wavelength band is formed once in the optical path between the reflector 5 and the phase modulator 4.

[0057] It should be noted that in this way, the reconstructed image of the first wavelength band is formed once, thereby improving the ease of layout of the optical components.

[0058] Here, Figure 1 The optical paths at the top and bottom of the reconstructed image of the emitted light from phase modulator 4 in the first wavelength band are shown separately. Specifically, the upper optical path is shown with solid lines, and the lower optical path is shown with long and short dashed lines.

[0059] For the emitted light from phase modulator 4, the optical route to the center of the reconstructed image in the first wavelength band. Figure 2 The solid line in the diagram shows this.

[0060] The emitted light from the phase modulator 4 is incident on the reflector 5 as diverging light, and the collimating lens 6 converts the diverging light into parallel light and emits it onto the dichroic mirror 7.

[0061] The dichroic mirror 7 is configured to reflect light in a first wavelength band and transmit light in another wavelength band. The emitted light from the phase modulator 4 (which is reflected by the mirror 5 and enters through the collimating lens 6 as described above) is reflected by the dichroic mirror 7.

[0062] The emitted light from the phase modulator 4, reflected by the dichroic mirror 7, enters the relay lens 9a in the lens optical system 9, where it is converted into converging light and then enters the wavelength conversion unit 8.

[0063] As described above, the wavelength conversion unit 8 performs wavelength conversion on the emitted light from the phase modulator 4 that enters through the relay lens 9a, thereby emitting light in a second wavelength band that is different from the first wavelength band.

[0064] Specifically, in this example, for instance, suppose the light in the second wavelength band is R (red) light.

[0065] In this example, a reflective phosphor is used in the wavelength conversion unit 8. In this case, the wavelength-converted light (i.e., the light in the second wavelength band) is emitted as reflected light from the wavelength conversion unit 8. Moreover, the reflected light is emitted as divergent light.

[0066] Here, the illumination device 1 is designed such that light in the first wavelength band entering the wavelength conversion unit 8 through the relay lens 9a is focused at the wavelength conversion unit 8. That is, in the illumination device 1, a reproduced image of the first wavelength band is formed again in the wavelength conversion unit 8.

[0067] In the following text, the image plane of the reproduced image of the first wavelength band in the wavelength conversion unit 8 will be referred to as the "first image plane Si1". In the figure, the reproduced image of the first wavelength band formed on the first image plane Si1 will be referred to as the "first reproduced image Im1".

[0068] Figure 1 The optical paths for light emitted from the wavelength conversion unit 8 in the second wavelength band are shown at positions corresponding to the upper and lower ends of the reconstructed image of the first wavelength band. Specifically, the optical path at the upper end is represented by a long double-short dashed line, and the optical path at the lower end is represented by a dashed line.

[0069] For light emitted from the second wavelength band from the wavelength conversion unit 8, the light route at the position corresponding to the center of the reproduced image of the first wavelength band. Figure 2 The long dashed line and the double short dashed lines in the middle represent...

[0070] The emitted light from the wavelength conversion unit 8 is guided to the projection lens 10 through the lens optical system 9, which includes the relay lens 9a.

[0071] In this example, the lens optical system 9 is configured as a relay lens optical system including relay lens 9a and relay lens 9b.

[0072] In the lens optical system 9 of this example, the relay lens 9b is arranged in the optical path from the wavelength conversion unit 8 to the projection lens 10 closer to the projection lens 10 than the dichroic mirror 7, and the emitted light from the wavelength conversion unit 8 is guided to the projection lens 10 through the relay lens 9a, the dichroic mirror 7 and the relay lens 9b.

[0073] Specifically, the light in the second wavelength band, which is the diverging light emitted from the wavelength conversion unit 8, is collimated by re-entering the relay lens 9a, passes as parallel light through the dichroic mirror 7, and enters the relay lens 9b. Then, the light in the second wavelength band is converted into converging light by the relay lens 9b and focused at a position in front of the projection lens 10. That is, the reproduced image of the second wavelength band is formed at a position in front of the projection lens 10.

[0074] In this way, the lens optical system 9 forms a reproduced image of the second wavelength band in the optical path between the projection lens 10 and the lens optical system 9 based on the emitted light from the wavelength conversion unit 8.

[0075] In the following text, the image plane of the reconstructed image of the second wavelength band will be referred to as "second image plane Si2". In this figure, the reconstructed image of the second wavelength band formed on the second image plane Si2 will be referred to as "second reconstructed image Im2".

[0076] Light focused on the second wavelength band on the second image plane Si2 enters the projection lens 10 and is emitted from the projection lens 10 as diverging light. Therefore, a reproduced image of the second wavelength band is obtained by magnifying and projecting it onto the second image plane Si2 through the projection lens 10.

[0077] The control unit 11 controls the light-emitting unit 2 and the phase modulator 4.

[0078] Specifically, for example, the control unit 11 includes electronic circuitry such as a central processing unit (CPU) and a digital signal processor (DSP), and controls, for example, the start / stop of the light emission operation of the light-emitting unit 2 and the amount of emitted light. Furthermore, the control unit 11 controls the spatial light phase modulation of the phase modulator 4, specifically controlling the phase modulation amount (pixel driving state) of each pixel.

[0079] In the lighting device 1 according to this embodiment, the lens optical system 9 forms a reproduced image of the second wavelength band in the optical path between the projection lens 10 and the lens optical system 9 based on the emitted light from the wavelength conversion unit 8.

[0080] That is, the reproduced image of the second wavelength band obtained by wavelength conversion in wavelength conversion unit 8 is not directly magnified and projected by projection lens 10. Instead, the reproduced image of the second wavelength band is formed once in front of projection lens 10, and then the reproduced image of the second wavelength band is magnified and projected by projection lens 10.

[0081] By adopting this configuration, the numerical aperture (NA) of the projection lens 10 can be reduced compared to the case where the reproduced image of the second wavelength band obtained by wavelength conversion in the wavelength conversion unit 8 is directly magnified and projected by the projection lens 10.

[0082] The ability to reduce the NA of the projection lens allows for a reduction in the size and weight of the illumination device 1. Furthermore, the ability to reduce the NA of the projection lens makes it possible to reduce aberrations in the projection lens 10. Therefore, the resolution of the projected image can be improved.

[0083] Furthermore, in this embodiment of the illumination device 1, by setting the focal length of the lens optical system 9, the area of ​​the reproduced image of the second wavelength band (second reproduced image Im2) is made larger than the area of ​​the reproduced image of the first wavelength band (first reproduced image Im1) formed in the wavelength conversion unit 8. Specifically, by setting the focal lengths of the relay lenses 9a and 9b, the area of ​​the second reproduced image Im2 is made larger than the area of ​​the first reproduced image Im1.

[0084] Therefore, the amount of blur caused by image surface distortion of the reproduced image in the second wavelength band can be reduced, and the reduction in resolution of the projected image caused by image surface distortion of the reproduced image in the second wavelength band can be suppressed.

[0085] Figure 3 The configuration of the lens optical system 9' as a comparative example is shown.

[0086] This comparative example represents an instance where the regions of the first reproduced image Im1 and the second reproduced image Im2 are the same.

[0087] In this way, when the area of ​​the first reproduced image Im1 and the area of ​​the second reproduced image Im2 are set to be the same, the image surface distortion of the second image plane Si2 increases due to the focal length of the lens optical system 9', which leads to a decrease in the resolution of the second reproduced image Im2.

[0088] In contrast, as with illumination device 1, by setting the area of ​​the second reproduced image Im2 to be larger than the area of ​​the first reproduced image Im1, image surface distortion of the second image surface Si2 can be reduced, and the reduction in the resolution of the second reproduced image Im2 can be suppressed. Therefore, the resolution of the projected image can be improved.

[0089] It should be noted that the above description, as an example, illustrates a configuration where the reproduced image of the first wavelength band is formed once in front of wavelength conversion unit 8 and then again in wavelength conversion unit 8. However, as in Figure 4 In the illumination device 1A shown, a configuration in which the reproduced image of the first wavelength band is not formed once in front of the wavelength conversion unit 8, but is formed directly in the wavelength conversion unit 8.

[0090] Hereinafter, the same reference numerals will be used for parts that are the same as those already described, and their descriptions will be omitted.

[0091] As shown in the figure, in the lighting device 1A, the light in the first wavelength band that has undergone spatial light phase modulation by the phase modulator 4 is reflected by the reflector 12, passes through the dichroic mirror 7, and enters the wavelength conversion unit 8.

[0092] In the lighting device 1A, the wavelength-converted light (light in the second wavelength band) emitted as reflected light from the wavelength conversion unit 8 is reflected by the dichroic mirror 7 and enters the lens optical system 9.

[0093] In this case, the spatial light phase modulation mode (driving mode of each pixel) in the phase modulator 4 is controlled by the control unit 11, so that the light in the first wavelength band emitted from the phase modulator 4 is focused at the wavelength conversion unit 8, that is, the reproduced image of the first wavelength band is formed in the wavelength conversion unit 8.

[0094] In this configuration, the wavelength-converted light in the second wavelength band is focused by the lens optical system 9 at a position in the optical path between the projection lens 10 and the lens optical system 9. Consequently, a second reconstructed image Im2 is formed on the second image plane Si2.

[0095] In the following text, the spatial light phase modulation mode in phase modulator 4 will be referred to as the "phase modulation mode".

[0096] It should be noted that in the above example, the reflected wavelength conversion unit is used as wavelength conversion unit 8, but the transmitted wavelength conversion unit can also be used.

[0097] Furthermore, examples of B-light as light in the first wavelength band (i.e., the excitation light of wavelength conversion unit 8) have already been described above. However, light in visible light wavelength bands other than B-light (but not in the second wavelength band), near-ultraviolet light, ultraviolet light, and other invisible light wavelength bands can also be used as excitation light.

[0098] Furthermore, the above example describes a configuration in which only wavelength-converted light in the second wavelength band is projected. However, it is also conceivable to employ a configuration in which light in the first wavelength band before wavelength conversion is mixed with wavelength-converted light in the second wavelength band.

[0099] <2. Second Implementation Method>

[0100] Next, the second embodiment will be described.

[0101] The second implementation involves time-division switching of wavelengths.

[0102] Figure 5 This is a diagram showing an example of the configuration of the lighting device 1B as a second embodiment.

[0103] and Figure 1The difference in the lighting device 1 shown is that the wavelength conversion unit 8B replaces the wavelength conversion unit 8, the polarization-separating dichroic mirror 13 replaces the dichroic mirror 7, and the quarter-wave plate 14 is disposed between the polarization-separating dichroic mirror 13 and the relay lens 9a.

[0104] The wavelength conversion unit 8B is configured to switch between a first mode and a second mode in a time division manner. In the first mode, incident light in a first wavelength band is converted into light in a second wavelength band that is different from the first wavelength band. In the second mode, incident light in the first wavelength band is not converted into wavelength.

[0105] Specifically, in this example, the wavelength conversion unit 8B includes a wavelength conversion element 8a and a rotation drive unit 8b that rotates the wavelength conversion element 8a, as shown in the figure.

[0106] Figure 6 This is a front view of the wavelength conversion element 8a.

[0107] As shown in the figure, the wavelength conversion element 8a has a structure in which a conversion region Ac, in which incident light in a first wavelength band is converted into light in a second wavelength band, and a non-conversion region An, in which incident light in the first wavelength band is not converted, are arranged in a circumferential direction. In this example, as in the wavelength conversion unit 8, the conversion region Ac is composed of a reflective phosphor, and the non-conversion region An is configured as a mirror.

[0108] In the second embodiment, the conversion region Ac performs light-to-yellow (Y) conversion as an example of wavelength conversion, but the wavelength conversion mode is not limited to a specific mode, such as the B-to-R conversion in the first embodiment.

[0109] When the wavelength conversion element 8a is rotated and driven as described above by the rotation drive unit 8b, wavelength conversion from the first wavelength band to the second wavelength band is performed during the period when the first image plane Si1 overlaps with the conversion region Ac, and wavelength conversion from the first wavelength band to the second wavelength band is not performed during the period when the first image plane Si1 overlaps with the non-conversion region An. This achieves time-division switching between the first mode and the second mode described above.

[0110] exist Figure 5 In the illumination device 1B, polarized light is used as light in the first wavelength band, and the light in the first wavelength band reflected by the reflector 5 is linearly polarized in a first direction (e.g., a direction perpendicular to the plane of the paper shown in the figure) which is the polarization direction.

[0111] The polarization-separating dichroic mirror 13 is configured to reflect linearly polarized light in a first direction (which is the polarization direction) and transmit linearly polarized light in a polarization direction orthogonal to the first direction (hereinafter referred to as the "second direction") in the first wavelength band. Therefore, light in the first wavelength band is reflected by the polarization-separating dichroic mirror 13 through mirror 5 and collimating lens 6 (in the aforementioned order), and then enters the wavelength conversion unit 8B through quarter-wave plate 14 and relay lens 9a (in the aforementioned order).

[0112] Each of the light in the second wavelength band emitted from the wavelength conversion unit 8B in the first mode and the light in the first wavelength band emitted from the wavelength conversion unit 8B in the second mode enters the polarization-separating dichroic mirror 13 through the relay lens 9a and the quarter-wave plate 14 (in the aforementioned order).

[0113] At this point, each ray of light is converted into linearly polarized light with a polarization direction as a second direction by passing back and forth through the quarter-wave plate 14.

[0114] The polarization-separating dichroic mirror 13 is configured, as described above, to transmit linearly polarized light in the second direction for light in the first wavelength band. Therefore, in the second mode, light in the first wavelength band passes through the polarization-separating dichroic mirror 13.

[0115] Furthermore, the polarization-separating dichroic mirror 13 is configured to reflect linearly polarized light in the first direction and transmit linearly polarized light in the second direction for light in the second wavelength band. Therefore, in the first mode, light in the second wavelength band passes through the polarization-separating dichroic mirror 13.

[0116] Therefore, in the first mode, the light in the second wavelength band obtained by wavelength conversion of the conversion region Ac of the wavelength conversion unit 8B passes through the polarization-separating dichroic mirror 13, forms a second reproduced image Im2 on the second image surface Si2 through the action of the lens optical system 9, and projects the second reproduced image Im2 through the projection lens 10.

[0117] On the other hand, in the second mode, the light in the first wavelength band reflected on the non-conversion region An passes through the polarization-separating dichroic mirror 13, and through the action of the lens optical system 9, a first reproduced image Im1 is formed again on the second image surface Si2, and the first reproduced image Im1 is projected through the projection lens 10.

[0118] Figure 7 This is a timing diagram showing the corresponding operations of the wavelength conversion unit 8B, phase modulator 4, and light-emitting unit 2 in the lighting device 1B.

[0119] In the figure, "1 frame" represents the period during which the reproduced images of the first and second wavelength bands are projected once, which in this example corresponds to the rotation period of the wavelength conversion element 8a.

[0120] As shown in the figure, in the wavelength conversion unit 8B, the wavelength conversion element 8a is rotated and driven by the rotation drive unit 8b to perform wavelength conversion from the first wavelength band (B light) to the second wavelength band (Y light) and wavelength non-conversion (B light output) operations in each frame.

[0121] Furthermore, regarding phase modulator 4, in this case, as an example, the light intensity distribution pattern of the reconstructed image is the same between the projection period of the reconstructed image in the second wavelength band and the projection period of the reconstructed image in the first wavelength band, and the same phase modulation pattern is used to perform spatial light phase modulation throughout a frame period.

[0122] It should be noted that the light intensity distribution pattern of the reproduced image can also be made different between frames.

[0123] Furthermore, it is conceivable that the light intensity distribution pattern of the reconstructed image differs between the projection period of the reconstructed image in the second wavelength band and the projection period of the reconstructed image in the first wavelength band.

[0124] Regarding the light-emitting unit 2, it is sufficient to emit light in each of the first and second modes of the wavelength conversion unit 8B. Basically, light can be emitted continuously.

[0125] Here, in the phase modulator 4, when the light intensity distribution pattern of the reproduced image is different between frames, that is, when the phase modulator 4 performs spatial light phase modulation on the frames using different phase modulation patterns, if the light-emitting unit 2 is always on, then due to the response time of the liquid crystal, a reproduced image with an undesirable light intensity distribution can be projected at the switching time between frames.

[0126] In view of this, it is also conceivable to control the light emission of the light-emitting unit 2 so that a non-light-emitting period is provided in the header period of the frame to wait for the liquid crystal response to be completed as shown in the figure.

[0127] It should be noted that, as can be understood from the above description, the control unit 11 is capable of controlling the light emission of the light-emitting unit 2.

[0128] Incidentally, in the second embodiment, a method using rotational drive as the wavelength conversion element 8a of the wavelength conversion unit 8B is employed, and since the light irradiation area in the conversion region Ac disperses over time, it can suppress the temperature rise of the conversion region Ac. In particular, when a phosphor is used in the conversion region Ac, the luminous efficiency of the phosphor tends to decrease with increasing temperature. Therefore, the luminous efficiency in the conversion region Ac can be improved because the temperature rise in the conversion region Ac is suppressed as described above.

[0129] In the lighting device 1B, the projection switching period between the second reproduced image Im2 and the first reproduced image Im1 can be adjusted by the rotational speed of the wavelength conversion element 8a. At this time, by setting the rotational speed of the wavelength conversion element 8a to a sufficiently high value, the human eye can also perceive a projected image of mixed colors in the first and second wavelength bands through the integration effect.

[0130] It should be noted that the conversion region Ac in the wavelength conversion element 8a has been described above as an example of reflection, but it can also be transmissive.

[0131] Furthermore, although an example in which the non-conversion region An is a mirror has been described, it can also be a diffuse reflective surface. Additionally, in the case where the wavelength conversion unit 8B is transmissive, it can be a diffuse transmissive surface.

[0132] Furthermore, although an example of setting a non-conversion region An in the wavelength conversion element 8a for time-division switching and projecting reproduced images of different wavelength bands has been described above, i.e., an example of incident light in the first wavelength band not being wavelength-converted in the second mode, setting a non-conversion region An is not necessary.

[0133] For example, instead of the non-conversion region An, a wavelength conversion region is set to convert the light wavelength in the first wavelength band into B light (i.e., convert the light wavelength in the first wavelength band into light in a specific wavelength band different from the first and second wavelength bands) as a configuration for emitting light in the first wavelength band other than R. The G light and B light, such as near-ultraviolet light, from the light-emitting unit 2 can be time-division switched and projected as a reconstructed image of two different wavelength bands, as in the example above.

[0134] Therefore, the mode of the second wavelength conversion unit 8B can be defined as a mode in which the incident light in the first wavelength band is not wavelength converted or the incident light in the first wavelength band is wavelength converted to light in a specific wavelength band that is different from the first wavelength band and the second wavelength band.

[0135] Furthermore, in the wavelength conversion unit 8B, it is sufficient to arrange the first region (conversion region Ac) that converts the incident light wavelength in the first wavelength band into light in the second wavelength band, and the second region that does not perform wavelength conversion on the incident light in the first wavelength band or converts the incident light wavelength in the first wavelength band into light in a specific wavelength band, in the circumferential direction as the wavelength conversion element 8a.

[0136] <3. Third Implementation Method>

[0137] In the third embodiment, the reproduced image of three wavelength bands is projected by time-division switching.

[0138] Here, we will take the case of projecting a panchromatic image by using time-division switching to project the reproduced images of R, G, and B light as reproduced images of three wavelength bands as an example.

[0139] Figure 8 This is a diagram showing an example of the configuration of the lighting device 1C as a third embodiment.

[0140] With the above Figure 5 The difference in the lighting device 1B shown is that wavelength conversion unit 8C replaces wavelength conversion unit 8B and control unit 11C replaces control unit 11.

[0141] The wavelength conversion unit 8C differs from the wavelength conversion unit 8B in that it includes a wavelength conversion element 8aC instead of a wavelength conversion element 8a.

[0142] like Figure 9 As shown, the wavelength conversion element 8aC has a structure in which the first conversion region Ac1, the second conversion region Ac2, and the non-conversion region An are arranged circumferentially in the front view.

[0143] The first conversion region Ac1 converts the incident light in the first wavelength band (B light in this example) into light in the second wavelength band (R light in this example). Furthermore, the second conversion region Ac2 converts the incident light in the first wavelength band into light in a wavelength band different from the first and second wavelength bands (G light in this example).

[0144] It should be noted that, here, the first conversion region Ac1 and the second conversion region Ac2 are described as examples of reflection, but they can also be transmission.

[0145] In the wavelength conversion unit 8C, when the wavelength conversion element 8aC, as described above, is rotated and driven by the rotation drive unit 8b, wavelength conversion from the first wavelength band to the second wavelength band (R light in this example) is performed during the period when the first image plane Si1 overlaps with the first conversion region Ac1, and wavelength conversion from the first wavelength band to a wavelength band different from the first and second wavelength bands (G light in this example) is performed during the period when the first image plane Si1 overlaps with the non-conversion region An. Furthermore, during the period when the first image plane Si1 overlaps with the non-conversion region An, wavelength conversion of light in the first wavelength band is not performed, and light in the first wavelength band is output.

[0146] In this way, the wavelength conversion unit 8C is configured to be able to switch between the first mode and the second mode and a third mode in a time division, in which the incident light in the first wavelength band is wavelength-converted to light in a wavelength band different from the first wavelength band and the second wavelength band.

[0147] exist Figure 8 In the first mode, light in the second wavelength band obtained by wavelength conversion in the first conversion region Ac1 passes through the polarization-separating dichroic mirror 13, forms a second reproduced image Im2 on the second image surface Si2 through the lens optical system 9, and projects the second reproduced image Im2 through the projection lens 10.

[0148] Furthermore, in the third mode, light in a wavelength band different from the first and second wavelength bands obtained by wavelength conversion in the second conversion region Ac2 passes through the polarization-separating dichroic mirror 13, and forms a reproduced image of a specific wavelength band on the second image surface Si2 through the action of the lens optical system 9, and the reproduced image is projected through the projection lens 10.

[0149] Furthermore, in the second mode, the light in the first wavelength band reflected on the non-conversion region An passes through the polarization-separating dichroic mirror 13, and through the action of the lens optical system 9, a first reproduced image Im1 is formed again on the second image surface Si2, and the first reproduced image Im1 is projected through the projection lens 10.

[0150] In this way, the illumination device 1C can perform time-division switching and projection between the reproduced image of R light (second wavelength band), the reproduced image of G light (wavelength band different from the first and second wavelength bands), and the reproduced image of B light (first wavelength band).

[0151] Here, the illumination device 1C in this example is designed to add a light intensity distribution based on the input image to the reproduced image for each wavelength band. That is, the panchromatic image is projected by time-division projection of the reproduced image, which reproduces the input image as a reproduced image of the corresponding wavelength bands of R, G, and B.

[0152] Specifically, as shown in the figure, images of each wavelength band of R, G, and B are input to the control unit 11C. The images of each wavelength band are, for example, moving images, and are input sequentially in frames.

[0153] Here, assuming that the wavelength band of the emitted light in the second mode of the wavelength conversion unit 8C is the "second mode wavelength band" and the wavelength band of the emitted light in the third mode of the wavelength conversion unit 8C is the "third mode wavelength band", the R image, B image, and G image input to the control unit 11C can be said to be the second wavelength band image showing the light intensity distribution of the reproduced image that should be added to the second wavelength band, the second mode wavelength band image showing the light intensity distribution of the reproduced image that should be added to the second mode wavelength band, and the third mode wavelength band image showing the light intensity distribution of the reproduced image that should be added to the third mode wavelength band, respectively.

[0154] In the first mode, the control unit 11C controls the phase modulator 4 to perform spatial light phase modulation to add the light intensity distribution shown by the second wavelength band image (in this example, the R image) to the reproduced image.

[0155] Furthermore, in the second mode, the control unit 11C controls the phase modulator 4 to perform spatial light phase modulation to add the light intensity distribution shown by the second mode wavelength band image (in this example, the G image) to the reproduced image.

[0156] Furthermore, in the third mode, the control unit 11C controls the phase modulator 4 to perform spatial light phase modulation to add the light intensity distribution shown by the third mode wavelength band image (in this example, the B image) to the reproduced image.

[0157] Therefore, for each reconstructed image of R-light (second wavelength band), G-light (third mode wavelength band), and B-light (second mode wavelength band), the light intensity distribution can be provided based on the input image of that wavelength band, and a panchromatic image can be presented by time-division projection of the reconstructed images of those wavelength bands.

[0158] To confirm, Figure 10 A timing diagram is shown representing the corresponding operation of the wavelength conversion unit 8C, phase modulator 4, and light-emitting unit 2 in the lighting device 1C.

[0159] In the figure, a “subframe” refers to the image projection period assigned to each of these wavelength bands (in this example, each of the R, G, and B beams) so that a reconstructed image of each wavelength band can be projected in a single frame period.

[0160] As shown in the figure, the wavelength conversion unit 8C repeatedly switches between wavelength conversion modes from B light to R light (first mode), wavelength conversion modes from B light to G light (third mode), and a mode that outputs B light without wavelength conversion (second mode) during each frame period.

[0161] Furthermore, regarding the operation of the phase modulator 4, as can be understood from the control content of the control unit 11C described above, spatial light phase modulation is performed in the first mode to add the light intensity distribution shown by the R image (second wavelength band image) to the reproduced image; spatial light phase modulation is performed in the third mode to add the light intensity distribution shown by the G image (third wavelength band image) to the reproduced image; and spatial light phase modulation is performed in the second mode to add the light intensity distribution shown by the B image (second wavelength band image) to the reproduced image.

[0162] Regarding the light-emitting unit 2, a non-light-emitting period is inserted at the beginning of each subframe as a predetermined time period, thereby providing the aforementioned response waiting time for the liquid crystal.

[0163] That is, the control unit 11C controls the light emission of the light emission unit 2, so that a non-light emission period is inserted at the beginning of each subframe.

[0164] Therefore, color mixing between subframes can be suppressed.

[0165] It should be noted that although an example of setting a non-conversion region An in the wavelength conversion element 8aC for time-division switching and projecting reproduced images of different wavelength bands has been described above, i.e., an example of not wavelength-converting the incident light in the first wavelength band in the second mode, it is not necessary to set a non-conversion region An in this case.

[0166] For example, in the same case, by using a wavelength conversion region, which converts the light wavelength in the first wavelength band into B light (i.e., converts the light wavelength in the first wavelength band into light in a specific wavelength band different from the first and second wavelength bands), instead of a non-conversion region An, as a configuration for emitting light in the first wavelength band other than R, the G light and B light, such as near-ultraviolet light, from the light-emitting unit 2 can be time-division switched and projected as a reproduced image of three different wavelength bands, as in the example above.

[0167] Therefore, also in the wavelength conversion unit 8C, the second mode can be defined as a mode in which the incident light in the first wavelength band is not wavelength converted or the incident light in the first wavelength band is wavelength converted to light in a specific wavelength band different from the first wavelength band and the second wavelength band. Furthermore, the third mode can be defined as a mode in which the incident light in the first wavelength band is wavelength converted to light in a wavelength band different from the first wavelength band, the second wavelength band, and the specific wavelength band.

[0168] In view of these points, it can be said that the first region (first conversion region Ac1) that converts the incident light wavelength in the first wavelength band into light in the second wavelength band is sufficient as the wavelength conversion element 8aC in the wavelength conversion unit 8C, the second region, wherein the incident light in the first wavelength band is not wavelength converted or the incident light in the first wavelength band is wavelength converted into light in a specific wavelength band, and the third region, wherein the incident light in the first wavelength band is wavelength converted into light in a wavelength band different from the first wavelength band, the second wavelength band and the specific wavelength band are arranged in the circumferential direction.

[0169] <4. Fourth Implementation Method>

[0170] In the fourth embodiment, the reproduced images of three wavelength bands are projected simultaneously.

[0171] Figure 11 This is a diagram showing an example of the configuration of the lighting device ID as a fourth embodiment.

[0172] and Figure 1The difference in the lighting device 1 shown is that the first light-emitting unit 21, the second light-emitting unit 22 and the third light-emitting unit 23 replace the light-emitting unit 2, and collimating lenses 31, 32 and 33, dichroic mirror 34, reflector 35 and dichroic mirror 36 are added, and the control unit 11D replaces the control unit 11.

[0173] Here, in the fourth embodiment, it is necessary to generate reconstructed images of three wavelength bands simultaneously, not in a time-division manner. Therefore, the phase modulation region (the region for spatial light phase modulation) of the phase modulator 4 is divided into three parts, so that reconstructed images with light intensity distributions corresponding to each wavelength band can be generated.

[0174] For example, as defined as Figure 12 The first phase modulation region Ar1, the second phase modulation region Ar2, and the third phase modulation region Ar3 are shown. Here, an example is shown in which the entire area of ​​the possible phase modulation region (which is the area where phase modulation can be performed in the phase modulator 4) is divided into three equal parts in a strip shape, such that the first phase modulation region Ar1, the second phase modulation region Ar2, and the third phase modulation region Ar3 are arranged sequentially from the bottom.

[0175] exist Figure 11 In this embodiment, the first light-emitting unit 21 is configured as the light source for the excitation light of the wavelength conversion unit 8, as in the light-emitting unit 2 in the first embodiment, and emits light in the first wavelength band (which is also B light in this example).

[0176] The second light-emitting unit 22 emits light in a fourth wavelength band (G light in this example) that is different from the first and second wavelength bands (the wavelength band converted by the wavelength conversion unit 8).

[0177] The third light-emitting unit 23 emits light in a fifth wavelength band (B light in this example), which is different from the second and fourth wavelength bands.

[0178] As shown in the figure, light (B light) in the first wavelength band emitted from the first light-emitting unit 21 enters a surface of the dichroic mirror 34 through the collimating lens 31, and light (B light) in the fifth wavelength band emitted from the third light-emitting unit 23 enters a surface of the dichroic mirror 34 through the collimating lens 33.

[0179] Furthermore, light (G light) emitted from the fourth wavelength band from the second light-emitting unit 22 enters the other surface of the dichroic mirror 34 through the collimating lens 32.

[0180] The dichroic mirror 34 is configured to reflect light in a fourth wavelength band and transmit light in another wavelength band. Thus, light in the first wavelength band from the first light-emitting unit 21 and light in the fifth wavelength band from the third light-emitting unit 23 pass through the dichroic mirror 34, light in the second wavelength band from the second light-emitting unit 22 is reflected by the dichroic mirror 34, and light in the first, fourth, and fifth wavelength bands is emitted from the other surface of the dichroic mirror 34 toward the phase modulator 4.

[0181] As shown in the figure, light emitted from the dichroic mirror 34 in the first, fourth, and fifth wavelength bands is incident on different phase modulation regions of the phase modulator 4. Specifically, in this example, light (B light) from the first wavelength band of the first light-emitting unit 21 is incident on the first phase modulation region Ar1, light (G light) from the second wavelength band of the second light-emitting unit 22 is incident on the second phase modulation region Ar2, and light (B light) from the fifth wavelength band of the third light-emitting unit 23 is incident on the third phase modulation region Ar3.

[0182] In this case, in the phase modulator 4, spatial light phase modulation is performed in the first phase modulation region Ar1 under the control of the control unit 11D, so that the incident light (B light) in the first wavelength band is emitted toward the reflector 5 and the first reconstructed image Im1 is formed in front of the reflector 5 at one time, as in the first embodiment.

[0183] That is, the control unit 11D controls the phase modulation pattern of the first phase modulation region Ar1, thereby generating the reproduced image to be formed in the wavelength conversion unit 8 as the reproduced image of the first wavelength band.

[0184] Therefore, in the illumination device 1D, similarly to the first embodiment, a reproduced image of the second wavelength band (the reproduced image in R light) can be formed on the second image surface Si2, and the reproduced image of the second wavelength band can be projected.

[0185] In the lighting device 1D, a dichroic mirror 36 is inserted in the optical path between the relay lens 9b and the projection lens 10, and the dichroic mirror 36 transmits light in the second wavelength band and reflects light in the other wavelength band.

[0186] Here, in the lighting device 1D, the reflector 35 and the aforementioned dichroic mirror 36 are provided so that an optical path can be formed to guide light from the phase modulator 4 to the second image plane Si2 without the wavelength conversion unit 8.

[0187] In the second phase modulation region Ar2 of the phase modulator 4, spatial light phase modulation is performed under the control of the control unit 11D, so that the incident light (G light) in the fourth wavelength band is emitted toward the reflector 35 and reflected by the reflector 35 and the dichroic mirror 36, and the light in the fourth wavelength band is focused on the second image surface Si.

[0188] That is, the control unit 11D controls the phase modulation pattern of the second phase modulation region Ar2, thereby generating a reconstructed image superimposed on the image plane of the reconstructed image of the second wavelength band as a reconstructed image of the fourth wavelength band.

[0189] Furthermore, in the third phase modulation region Ar3 of the phase modulator 4, spatial light phase modulation is performed under the control of the control unit 11D, so that the incident light (B light) in the fifth wavelength band is emitted toward the reflector 35, and the light in the fifth wavelength band reflected by the reflector 35 and reflected by the dichroic mirror 36 is focused on the second image surface Si.

[0190] That is, the control unit 11D controls the phase modulation pattern of the third phase modulation region Ar3, thereby generating a reconstructed image on the image plane of the reconstructed image of the second wavelength band as a reconstructed image of the fifth wavelength band.

[0191] In this way, in the illumination device 1D, spatial light phase modulation of each phase modulation region of the phase modulator 4 simultaneously forms reconstructed images of R light (second wavelength band), G light (fourth wavelength band) and B light (fifth wavelength band) on the second image plane Si2, and a superimposed image of these reconstructed images is projected through the projection lens 10.

[0192] Therefore, a panchromatic image can be presented by simultaneously projecting the reproduced image of three wavelength bands such as R, G, and B.

[0193] Since the images of each wavelength band are not projected in time-division format, but are projected simultaneously as a superimposed image, color corruption can be suppressed.

[0194] Here, in the lighting device 1D according to the fourth embodiment, a reproduced image having a light intensity distribution based on the input image is projected as a reproduced image for each wavelength band.

[0195] To this end, the control unit 11D controls the spatial light phase modulation for each of the first phase modulation region Ar1, the second phase modulation region Ar2, and the third phase modulation region Ar3 based on the R, G, and B images input in frames.

[0196] Specifically, regarding the first phase modulation region Ar1, the phase modulation pattern is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the input R image to the reconstructed image of the first wavelength band.

[0197] Furthermore, for the second phase modulation region Ar2, the phase modulation pattern is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the input G image to the reconstructed image of the fourth wavelength band.

[0198] Furthermore, for the third phase modulation region Ar3, the phase modulation pattern is controlled to perform spatial light phase modulation, so as to add the light intensity distribution shown by the input B image to the reproduced image of the fifth wavelength band.

[0199] Therefore, for each of the reconstructed images of the second, fourth, and fifth wavelength bands, a light intensity distribution depending on the input image of that wavelength band can be provided, and a panchromatic image can be presented by simultaneously projecting the reconstructed images of those wavelength bands.

[0200] To confirm, Figure 13 A timing diagram showing the operation of the corresponding light-emitting units in the phase modulator 4 and the illumination device 1D is shown.

[0201] As shown in the figure, for phase modulator 4, for each frame, spatial light phase modulation based on the R image is performed in the first phase modulation region Ar1 (the first region in the figure), spatial light phase modulation based on the G image is performed in the second phase modulation region Ar2 (the second region in the figure), and spatial light phase modulation based on the B image is performed in the third phase modulation region Ar3 (the third region in the figure).

[0202] In addition, in this example, for the first light-emitting unit 21, the second light-emitting unit 22 and the third light-emitting unit 23, a non-light-emitting period is inserted at the beginning of each frame to ensure the response waiting time of the liquid crystal.

[0203] That is, the control unit 11D controls the light emission of the first light-emitting unit 21, the second light-emitting unit 22 and the third light-emitting unit 23 in such a way that a non-light-emitting period is inserted at the beginning of each frame.

[0204] Therefore, it can prevent the image in the immediately preceding frame from being superimposed as a ghost image in the subsequent frame, and can improve the quality of the projected image.

[0205] Here, although examples of performing wavelength conversion to R light in wavelength conversion unit 8 (or 8B, 8C) have been described so far, this eliminates the need to use a light-emitting element that emits R light as light-emitting unit 2.

[0206] As a light-emitting element that emits red light, a red laser (laser diode) sometimes has a large emitter (light-emitting point) and uses multiple emitters, for example, such as Figure 14 As shown, this makes it relatively difficult to calibrate the emitted light. When attempting to obtain a directly reconstructed image using a red laser, this lower collimation results in a reduction in the resolution of the projected image.

[0207] In view of this, the above example adopts the following configuration: a first reconstructed image Im1 is generated at a higher resolution by using a blue laser (or even a green laser) whose emitter size has a relatively small impact as the light-emitting unit, and then the reconstructed image in the R light is obtained by wavelength conversion of the reconstructed image in the R light.

[0208] Therefore, since a red laser is not required, the resolution of the projected image can be improved.

[0209] It should be noted that, relative to the fourth embodiment, the phase modulation region in the phase modulator 4 has been assumed to be divided equally above, but the phase modulation region may be divided unequally.

[0210] Furthermore, although an example of dividing the phase modulation region of the phase modulator 4 into three parts to generate reconstructed images of each wavelength band has been described above, it is also possible to use a configuration in which three phase modulators 4 are set up and each phase modulator 4 performs spatial light phase modulation for generating reconstructed images of the corresponding wavelength band.

[0211] In this case, the phase modulation regions of the phase modulator 4 can be considered to correspond to the first phase modulation region Ar1, the second phase modulation region Ar2, and the third phase modulation region Ar3, respectively.

[0212] Furthermore, an example has been described above in which the light in the second wavelength band is R light, the light in the first wavelength band (B light) enters the first phase modulation region Ar1, the light in the fourth wavelength band (G light) enters the second phase modulation region Ar2, and the light in the fifth wavelength band (B light) enters the third phase modulation region Ar3.

[0213] However, the light used as the first wavelength band is not limited to the exemplified B light, but can also be a wavelength band other than R light, such as G light. That is, the first wavelength band only needs to be a wavelength band other than at least the second wavelength band, which is the wavelength band converted by the wavelength conversion unit 8.

[0214] In addition, G light is an example of light in the fourth wavelength band, but the fourth wavelength band can be light in a wavelength band other than at least the second and fifth wavelength bands.

[0215] Furthermore, although B light is used as light in the fifth wavelength band, the fifth wavelength band only needs to be a wavelength band other than at least the second and fourth wavelength bands.

[0216] Moreover, in such Figure 11 In the case where the first wavelength band is equal to the fifth wavelength band, the light sources of the first and fifth wavelength bands can be shared.

[0217] <5. Fifth Implementation Method>

[0218] In the fifth embodiment, spatial light intensity modulation is performed on the reconstructed image generated by spatial light phase modulation.

[0219] Figure 15 This is a diagram showing an example of the configuration of the lighting device 1E as a fifth embodiment.

[0220] With Figure 1 The difference between the illumination device 1 of the first embodiment shown is that an intensity modulator 40 and a prism 41 are provided in the optical path between the relay lens 9b and the projection lens 10 in the lens optical system 9, and a control unit 11E replaces the control unit 11.

[0221] Intensity modulator 40 is a spatial light modulator that performs spatial light intensity modulation on the incident light and, in this example, is a reflective element. Specifically, a digital micromirror device (DMD) is used.

[0222] As shown in the figure, the optical axis of the light (e.g., R-light) emitted from the relay lens 9b in the second wavelength band is bent by the refraction of the prism 41 and enters the modulation plane of the intensity modulator 40.

[0223] Then, the light in the second wavelength band, whose spatial light intensity is modulated by the intensity modulator 40, enters the projection lens 10 through the prism 41.

[0224] At this time, in the illumination device 1E, by setting the focal length of the lens optical system 9, the light in the second wavelength band is focused on the modulation plane of the intensity modulator 40, that is, the second image plane Si2 is consistent with the modulation plane, and the area of ​​the second reproduced image Im2 formed on the second image plane Si2 is greater than the area of ​​the first reproduced image Im1 formed in the phase modulator 4.

[0225] The difference between control unit 11E and control unit 11 is that control unit 2 and phase modulator 4 and also control intensity modulator 40.

[0226] Specifically, the control unit 11E controls the spatial light phase modulation performed by the phase modulator 4 and the spatial light intensity modulation performed by the intensity modulator 40 based on the input image. The phase modulator 4 controls the phase modulation pattern such that the light intensity distribution shown by the input image is added to the first reconstructed image Im1.

[0227] Here, typically, the resolution of the reproduced image generated by spatial light phase modulation via phase modulator 4 is set to be lower than the resolution of the reproduced image generated by spatial light intensity modulation via intensity modulator 40.

[0228] Therefore, in the lighting device 1E, the resolution of the projected image is improved by correcting the second reproduced image Im2 generated according to the spatial light phase modulation of the phase modulator 4, so that the high-frequency components of the input image are supplemented by the intensity modulator 40.

[0229] Specifically, the control unit 11E extracts the high-frequency components of the input image and controls the spatial light intensity modulation of the intensity modulator 40, so that the light intensity distribution corresponding to the second reproduced image Im2 entering the intensity modulator 40 is added together.

[0230] It should be noted that although an example of using a DMD as an intensity modulator 40 has been described above, another reflective spatial light intensity modulator, such as a reflective liquid crystal panel or a transmissive spatial light intensity modulator, such as a transmissive liquid crystal panel, can be used as an intensity modulator 40.

[0231] Furthermore, although the above assumes that light in a single wavelength band is projected as in the first embodiment, as in the second and third embodiments, a configuration of time-division projection of light in multiple wavelength bands can be added to the fifth embodiment. In this case, it is sufficient to perform time-division spatial light intensity modulation of the input image based on each wavelength band in the intensity modulator 40.

[0232] Alternatively, the same structure as the fourth embodiment, which simultaneously projects light across multiple wavelength bands, can be applied to the fifth embodiment. In this case, it is conceivable that intensity modulators 40 are configured for each wavelength band to be projected, and each intensity modulator 40 performs spatial light intensity modulation based on an input image of the incident light in the wavelength band.

[0233] <6. Variations>

[0234] Various implementations of the present technology have been described above. However, the present technology is not limited to the specific examples described above, and various configurations may be used as variations.

[0235] For example, it is also conceivable to use retroreflective materials in wavelength conversion unit 8.

[0236] For example, such as Figure 16 As shown, it is also conceivable to use a wavelength conversion unit 8 in which the glass beads 83 are exposed.

[0237] As shown in the figure, in this case, the wavelength conversion unit 8 has the following structure: a layer of phosphor 82 is formed on a substrate 81 that serves as a reflective layer, and a plurality of glass beads 83 are arranged on the layer of phosphor 82.

[0238] The glass bead 83 enables retroreflection and suppresses the divergence of wavelength-converted light emitted from the wavelength conversion unit 8.

[0239] This improves the light-capturing efficiency of the lens optical system 9. Consequently, the resolution of the projected image can be increased.

[0240] Furthermore, the above example illustrates a structure with the glass bead 83 exposed, but other structures, such as a closed structure without the glass bead 83 embedded, can also be used to achieve retroreflectivity.

[0241] Furthermore, for the wavelength conversion unit, a light-emitting surface with a curved surface can be used, such as... Figure 17 The wavelength conversion unit 8F of the illumination device 1F shown. Specifically, in this case, the curved surface is configured as a concave curved surface (a curved surface that bulges out on the side opposite to the side that emits wavelength-converted light) as shown in the figure.

[0242] Therefore, aberrations caused by the lens optical system can be corrected, specifically, aberrations such as image surface distortion in the reproduced image.

[0243] Therefore, the resolution of the projected image can be improved.

[0244] Furthermore, although an example of using a reflective liquid crystal panel as phase modulator 4 has been described above, spatial light phase modulators other than reflective liquid crystal panels can also be used as phase modulator 4.

[0245] For example, a transmissive liquid crystal panel can be used. Furthermore, it is not limited to liquid crystal panels; devices other than liquid crystal panels can be used, such as microelectromechanical systems (MEMS) based devices (e.g., devices configured such that the height of the mirror is adjustable for each pixel).

[0246] <7. Overview of Implementation Methods>

[0247] As described above, the illumination device (illumination device 1, 1A, 1B, 1C, 1D, 1E, 1F) as an embodiment includes a light-emitting unit (light-emitting unit 2, 21) that emits light in a first wavelength band, a phase modulation unit (phase modulation unit 4) that performs spatial light phase modulation on the incident light from the light-emitting unit, a wavelength conversion unit (wavelength conversion unit 8, 8B, 8C, 8F) that performs wavelength conversion on the incident light from the phase modulation unit to emit light in a second wavelength band different from the first wavelength band, and a lens optical system (lens optical system 9) that guides the emitted light from the wavelength conversion unit to a projection lens, wherein the phase modulation unit generates a reproduced image formed in the wavelength conversion unit as a reproduced image of the first wavelength band, and the lens optical system forms a reproduced image of the second wavelength band in the optical path between the projection lens and the lens optical system based on the emitted light from the wavelength conversion unit.

[0248] That is, the reproduced image of the second wavelength band obtained by wavelength conversion through the wavelength conversion unit is not directly magnified and projected by the projection lens. Instead, the reproduced image of the second wavelength band is formed once in front of the projection lens, and then magnified and projected by the projection lens. Therefore, compared with the case where the reproduced image of the second wavelength band obtained by wavelength conversion through the wavelength conversion unit is directly magnified and projected by the projection lens, the NA of the projection lens can be reduced.

[0249] The ability to reduce the NA (noise field) of a projection lens allows for a reduction in the size and weight of the illumination device. Furthermore, reducing the NA of the projection lens enables the capture of projection lens aberrations. Therefore, the resolution of the projected image can be improved.

[0250] Furthermore, the lighting device as an embodiment includes a control unit that controls the phase modulation unit (phase modulation unit 11C, 11D, 11E), wherein the control unit controls the phase modulation unit to perform spatial light phase modulation to provide a light intensity distribution based on the input image to the reproduced image (see the third and fourth embodiments).

[0251] Therefore, an image can be projected and reproduced based on an input image. That is, image projection can be realized.

[0252] Furthermore, in the lighting device implemented as an example, the area of ​​the reproduced image of the second wavelength band is larger than the area of ​​the reproduced image of the first wavelength band formed in the wavelength conversion unit.

[0253] Therefore, the amount of blurring caused by image surface distortion of the reproduced image in the second wavelength band can be reduced.

[0254] Therefore, the reduction in the resolution of the projected image caused by image surface distortion of the reproduced image in the second wavelength band can be suppressed.

[0255] Furthermore, in the lighting device implemented as an example, the lens optical system is configured as a relay lens optical system.

[0256] Therefore, the reproduced image of the second wavelength band can be appropriately formed in front of the projection lens. Furthermore, the size of the reproduced image of the second wavelength band can be easily adjusted using the magnification adjustment function of the relay lens optical system.

[0257] Furthermore, in the lighting devices (lighting devices 1B, 1C) implemented as embodiments, the wavelength conversion units (wavelength conversion units 8B, 8C) are configured to be able to switch between a first mode and a second mode in a time division manner. In the first mode, incident light in a first wavelength band is wavelength-converted into light in a second wavelength band that is different from the first wavelength band. In the second mode, incident light in the first wavelength band is not wavelength-converted or incident light in the first wavelength band is wavelength-converted into light in a specific wavelength band that is different from the first wavelength band and the second wavelength band.

[0258] Therefore, time-division switching and projection can be performed at least between the reproduced image of the second wavelength band (in the first mode) and the reproduced image of the first wavelength band (in the case where wavelength conversion is not performed on the second mode) or the reproduced image of a specific wavelength band (in the case where wavelength conversion is performed on the second mode).

[0259] Furthermore, in the lighting device as an embodiment, the wavelength conversion unit includes wavelength conversion elements (wavelength conversion elements 8a, 8aC), a first region (conversion region Ac, first conversion region Ac1) and a second region (non-conversion region An). In the first region, incident light in a first wavelength band is converted into light in a second wavelength band. In the second region, incident light in the first wavelength band is not converted into light or incident light in the first wavelength band is converted into light in a specific wavelength band. It also includes a rotation drive unit (rotation drive unit 8b) that rotates and drives the wavelength conversion elements.

[0260] That is, the rotation drive unit that drives the wavelength conversion element can switch between the first mode and the second mode in a time-division manner.

[0261] By using a rotating drive wavelength conversion element, the first and second regions are formed in the circumferential direction as described above, enabling stable time-division switching between the first and second modes. Furthermore, because the light-irradiated area in the first region is dispersed over time, temperature rise in the first region can be suppressed. Therefore, the luminous efficiency in the first region can be improved.

[0262] Furthermore, in the lighting device (lighting device 1C) as an embodiment, the wavelength conversion unit (wavelength conversion unit 8C) is configured to be able to switch between a first mode, a second mode and a third mode in a time division manner. In the third mode, incident light in the first wavelength band is wavelength-converted into light in a wavelength band different from the first wavelength band, the second wavelength band and the specific wavelength band.

[0263] Therefore, three types of wavelength band reconstructed images can be time-division switched and projected: a reconstructed image of the second wavelength band (in the first mode), a reconstructed image of the first wavelength band (without performing wavelength conversion in the second mode) or a reconstructed image of a specific wavelength band (with wavelength conversion performed in the second mode), and a reconstructed image of yet another wavelength band (in the third mode).

[0264] For example, the reproduced images of R, G, and B can be switched and projected as reproduced images of three types of wavelength bands. If the switching between the first, second, and third modes is performed at a sufficiently high speed, a panchromatic image can be projected by utilizing the integration effect of the human eye.

[0265] Furthermore, the lighting device as an embodiment includes a control unit for controlling a phase modulation unit (phase modulation unit 1C), wherein, assuming that the wavelength band of the emitted light in the second mode of the wavelength conversion unit is the second mode wavelength band and the wavelength band of the emitted light in the third mode of the wavelength conversion unit is the third mode wavelength band, the control unit receives input of a second wavelength band image and a second mode wavelength band image, the second wavelength band image showing the light intensity distribution that should be added to the reproduced image of the second wavelength band, the second mode wavelength band image showing the light intensity distribution that should be added to the reproduced image of the second mode wavelength band, and the third mode wavelength band image showing the light intensity distribution that should be added to the reproduced image of the third mode wavelength band, and controls the phase modulation unit to perform spatial light phase modulation to add the light intensity distribution shown by the second wavelength band image to the reproduced image in the second mode, and controls the phase modulation unit to perform spatial light phase modulation to add the light intensity distribution shown by the second mode wavelength band image to the reproduced image in the third mode, and controls the phase modulation unit to perform spatial light phase modulation to add the light intensity distribution shown by the third mode wavelength band image to the reproduced image in the third mode.

[0266] Therefore, for each reconstructed image of the second wavelength band, the second mode wavelength band, and the third mode wavelength band, the light intensity distribution can be provided based on the input image of that wavelength band, and a panchromatic image can be presented by time-division projection of the reconstructed images of those wavelength bands.

[0267] Furthermore, in the illumination device (illumination device 1D) as an embodiment, the phase modulation unit includes: a first phase modulation region (first phase modulation region Ar1) on which light in a first wavelength band is incident; a second phase modulation region (second phase modulation region Ar2) on which light in a fourth wavelength band is incident, the fourth wavelength band being a wavelength band different from the second wavelength band; and a third phase modulation region (third phase modulation region Ar3) on which light in a fifth wavelength band is incident, the fifth wavelength band being a wavelength band different from both the second and fourth wavelength bands. In the first phase modulation region, a reconstructed image to be formed in the wavelength conversion unit is generated by spatial light phase modulation as a reconstructed image of the first wavelength band. In the second phase modulation region, a reconstructed image superimposed on the image plane of the reconstructed image of the second wavelength band is generated by spatial light phase modulation as a reconstructed image of the fourth wavelength band. In the third phase modulation region, a reconstructed image superimposed on the image plane of the reconstructed image of the second wavelength band is generated by spatial light phase modulation as a reconstructed image of the fifth wavelength band.

[0268] Therefore, for example, it is possible to project an overlapping image of at least three wavelength bands, such as the second wavelength band = R, the fourth wavelength band = G, and the fifth wavelength band = B, to present a full-color image. Since the images of each wavelength band are not projected in time-division, but are projected simultaneously as a superimposed image, color distortion can be suppressed.

[0269] Furthermore, the lighting device in this embodiment includes a control unit for controlling a phase modulation unit (phase modulation unit 11D). The control unit receives input of a second wavelength band image representing the light intensity distribution of a reproduced image to be added to a second wavelength band, a fourth wavelength band image showing the light intensity distribution of a reproduced image to be added to a fourth wavelength band, and a fifth wavelength band image showing the light intensity distribution of a reproduced image to be added to a fifth wavelength band. The control unit controls the phase modulation unit to perform spatial light phase modulation in a first phase modulation region to add the light intensity distribution shown by the second wavelength band image to the reproduced image of the first wavelength band, to perform spatial light phase modulation in a second phase modulation region to add the light intensity distribution shown by the fourth wavelength band image to the reproduced image of the fourth wavelength band, and to perform spatial light phase modulation in a third phase modulation region to add the light intensity distribution shown by the fifth wavelength band image to the reproduced image of the fifth wavelength band.

[0270] Therefore, for each of the reconstructed images of the second, fourth, and fifth wavelength bands, a light intensity distribution depending on the input image of that wavelength band can be provided, and a panchromatic image can be presented by simultaneously projecting the reconstructed images of those wavelength bands.

[0271] Furthermore, the illumination device (illumination device 1E) in this embodiment includes an intensity modulator (intensity modulator 40) that performs spatial light intensity modulation on the image plane of the reproduced image of the second wavelength band.

[0272] The light intensity distribution of the reproduced image can be adjusted using the intensity modulator described above.

[0273] Therefore, the resolution of the projected image can be improved.

[0274] Furthermore, in the lighting device implemented as an example, the wavelength conversion unit has a back reflectivity (see...). Figure 16 ).

[0275] Therefore, the divergence of light emitted from the wavelength conversion unit into the second wavelength band of the lens optical system is suppressed.

[0276] Therefore, the efficiency of light capture in the lens optical system can be improved. Therefore, the resolution of the projected image can be improved.

[0277] Furthermore, in the lighting device (lighting device 1F) as an embodiment, the light-emitting surface in the wavelength conversion unit (wavelength conversion unit 8F) includes a curved surface.

[0278] Therefore, aberrations caused by the lens optical system can be corrected, specifically, aberrations such as image surface distortion in the reproduced image.

[0279] Therefore, the resolution of the projected image can be improved.

[0280] It should be noted that the effects described in this article are merely examples and are not limited thereto, and other effects may be provided.

[0281] <8. This technology>

[0282] This technology can be configured as follows.

[0283] (1) A lighting device, comprising:

[0284] The light-emitting unit emits light in the first wavelength band;

[0285] The phase modulation unit performs spatial light phase modulation on the incident light from the light-emitting unit;

[0286] A wavelength conversion unit converts the incident light from the phase modulation unit, thereby emitting light in a second wavelength band different from the first wavelength band; and

[0287] The lens optical system guides the emitted light from the wavelength conversion unit to the projection lens, wherein...

[0288] The phase modulation unit generates the reconstructed image formed in the wavelength conversion unit as the reconstructed image of the first wavelength band, and

[0289] The lens optical system forms a reproduced image of the second wavelength band in the optical path between the projection lens and the lens optical system based on the emitted light from the wavelength conversion unit.

[0290] (2) The lighting device according to (1) further includes:

[0291] The control unit controls the phase modulation unit, wherein...

[0292] The control unit controls the phase modulation unit to perform spatial light phase modulation to provide a light intensity distribution based on the input image to the reproduced image.

[0293] (3) The lighting device according to (1) or (2), wherein,

[0294] The area of ​​the reproduced image of the second wavelength band is larger than the area of ​​the reproduced image of the first wavelength band formed in the wavelength conversion unit.

[0295] (4) The lighting device according to any one of (1) to (3), wherein,

[0296] The lens optical system is a relay lens optical system.

[0297] (5) The lighting device according to any one of (1) to (3), wherein,

[0298] The wavelength conversion unit is configured to time-division switch between a first mode and a second mode. In the first mode, incident light in a first wavelength band is wavelength-converted to light in a second wavelength band that is different from the first wavelength band. In the second mode, incident light in the first wavelength band is not wavelength-converted, or light in a specific wavelength band that is different from the first wavelength band and the second wavelength band is wavelength-converted.

[0299] (6) The lighting device according to (5), wherein,

[0300] The wavelength conversion unit includes:

[0301] A wavelength conversion element, wherein a first region and a second region are arranged in a circumferential direction, the first region converts incident light wavelengths in a first wavelength band into light in a second wavelength band, and the second region does not convert incident light wavelengths in the first wavelength band or does not convert wavelengths in a specific wavelength band.

[0302] Rotary drive unit, rotary drive wavelength conversion element.

[0303] (7) The lighting device according to (4) or (5), wherein,

[0304] The wavelength conversion unit is configured to switch between a first mode, a second mode, and a third mode in a time division manner. In the third mode, the incident light in the first wavelength band is converted into light in a wavelength band that is different from the first wavelength band, the second wavelength band, and the specific wavelength band.

[0305] (8) The lighting device according to (7) further includes:

[0306] The control unit controls the phase modulation unit, wherein...

[0307] Assume that the wavelength band of the light emitted in the second mode of the wavelength conversion unit is the second mode wavelength band, and the wavelength band of the light emitted in the third mode of the wavelength conversion unit is the third mode wavelength band.

[0308] Control Unit

[0309] The system receives inputs of a second wavelength band image representing the light intensity distribution of a reconstructed image to be added to a second wavelength band, a second mode wavelength band image representing the light intensity distribution of a reconstructed image to be added to a second mode wavelength band, and a third mode wavelength band image representing the light intensity distribution of a reconstructed image to be added to a third mode wavelength band.

[0310] In the first mode, the phase modulation unit is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the second wavelength band image to the reconstructed image.

[0311] In the second mode, the phase modulation unit is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the second mode wavelength band image to the reconstructed image, and

[0312] In the third mode, the phase modulation unit is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the third mode wavelength band image to the reproduced image.

[0313] (9) The lighting device according to any one of (1) to (4), wherein,

[0314] Phase modulation unit

[0315] include

[0316] The first phase modulation region, light in the first wavelength band is incident on the first phase modulation region;

[0317] In the second phase modulation region, light from the fourth wavelength band is incident on the second phase modulation region, and the fourth wavelength band is a different wavelength band from the second wavelength band; and

[0318] The third phase modulation region allows light from the fifth wavelength band to be incident on it. The fifth wavelength band is different from the second and fourth wavelength bands.

[0319] In the first phase modulation region, a reconstructed image to be formed in the wavelength conversion unit is generated by spatial optical phase modulation as the reconstructed image of the first wavelength band.

[0320] The reconstructed image generated by spatial optical phase modulation in the second phase modulation region and superimposed on the reconstructed image in the second wavelength band serves as the reconstructed image in the fourth wavelength band.

[0321] By spatial light phase modulation in the third phase modulation region, a reconstructed image superimposed on the reconstructed image in the second wavelength band is generated as a reconstructed image in the fifth wavelength band.

[0322] (10) The lighting device according to (9) further includes:

[0323] The control unit controls the phase modulation unit, wherein...

[0324] Control Unit

[0325] The system receives inputs of a second wavelength band image representing the light intensity distribution of a reconstructed image to be added to the second wavelength band, a fourth wavelength band image representing the light intensity distribution of a reconstructed image to be added to the fourth wavelength band, and a fifth wavelength band image representing the light intensity distribution of a reconstructed image to be added to the fifth wavelength band.

[0326] The phase modulation unit is controlled such that spatial light phase modulation is performed in a first phase modulation region to add the light intensity distribution shown by the second wavelength band image to the reproduced image of the first wavelength band, spatial light phase modulation is performed in a second phase modulation region to add the light intensity distribution shown by the fourth wavelength band image to the reproduced image of the fourth wavelength band, and spatial light phase modulation is performed in a third phase modulation region to add the light intensity distribution shown by the fifth wavelength band image to the reproduced image of the fifth wavelength band.

[0327] (11) The lighting device according to any one of (1) to (10) further comprises:

[0328] An intensity modulator performs spatial light intensity modulation on the image plane of the reconstructed image of the second wavelength band.

[0329] (12) The lighting device according to any one of (1) to (11), wherein,

[0330] The wavelength conversion unit is retroreflective.

[0331] (13) The lighting device according to any one of (1) to (12), wherein,

[0332] The light-emitting surface in the wavelength conversion unit includes a curved surface.

[0333] Reference number list

[0334] 1. Lighting fixtures 1A, 1B, 1C, 1D, 1E, 1F

[0335] 2 light-emitting units

[0336] 3, 6 collimating lenses

[0337] 4. Phase modulator

[0338] 5. Reflectors

[0339] 7. Dichroic mirror

[0340] Wavelength conversion units 8, 8B, 8C, and 8F

[0341] 9. 9' Lens Optical System

[0342] 9a, 9b relay lenses

[0343] 10 projection lenses

[0344] 11, 11C, 11D, 11E control units

[0345] Im1 First Reproduced Image

[0346] Im2 Second Reconstructed Image

[0347] Si1 First Image Plane

[0348] Si2 Second Image Plane

[0349] 12 Reflectors

[0350] 13 Polarization-separated dichroic mirror

[0351] 14 Quarter-wave plate

[0352] 8a, 8aC wavelength conversion elements

[0353] 8b Rotary Drive Unit

[0354] Ac conversion area

[0355] An non-conversion region

[0356] Ac1 First Transition Region

[0357] Ac2 Second Transition Region

[0358] 21 First Light-Emitting Unit

[0359] 22 Second light-emitting unit

[0360] 23 Third light-emitting unit

[0361] Collimating lenses 31, 32, and 33

[0362] 34, 36 Dichroic mirrors

[0363] 35 Reflector

[0364] Ar1 First Phase Modulation Region

[0365] Ar2 second phase modulation region

[0366] Ar3 Third Phase Modulation Region

[0367] 40 intensity modulator

[0368] 41 Prisms

[0369] 81 Substrate

[0370] 82 Phosphors

[0371] 83 glass beads

Claims

1. A lighting device, comprising: The light-emitting unit emits light in the first wavelength band; A phase modulation unit performs spatial light phase modulation on the incident light from the light-emitting unit; A wavelength conversion unit converts the incident light from the phase modulation unit to emit light in a second wavelength band that is different from the first wavelength band. as well as The lens optical system guides the emitted light from the wavelength conversion unit to the projection lens, wherein... The phase modulation unit generates the reproduced image formed in the wavelength conversion unit as the reproduced image of the first wavelength band, and The lens optical system forms a reproduced image of the second wavelength band in the optical path between the projection lens and the lens optical system based on the emitted light from the wavelength conversion unit.

2. The lighting device according to claim 1, further comprising: The control unit controls the phase modulation unit, wherein... The control unit controls the phase modulation unit to perform spatial light phase modulation to provide a light intensity distribution based on the input image to the reproduced image.

3. The lighting device according to claim 1, wherein, The area of ​​the reproduced image of the second wavelength band is larger than the area of ​​the reproduced image of the first wavelength band formed in the wavelength conversion unit.

4. The lighting device according to claim 1, wherein, The lens optical system is a relay lens optical system.

5. The lighting device according to claim 1, wherein, The wavelength conversion unit is configured to time-division switch between a first mode and a second mode. In the first mode, incident light in the first wavelength band is wavelength-converted into light in the second wavelength band, which is different from the first wavelength band. In the second mode, incident light in the first wavelength band is not wavelength-converted or is wavelength-converted into light in a specific wavelength band, which is different from both the first and second wavelength bands.

6. The lighting device according to claim 5, wherein, The wavelength conversion unit includes: A wavelength conversion element, wherein a first region and a second region are arranged in a circumferential direction, the first region converts incident light wavelengths in a first wavelength band into light in the second wavelength band, and the second region either converts incident light in the first wavelength band into light in the first wavelength band or converts incident light wavelengths in the first wavelength band into light in the specified wavelength band. A rotary drive unit that drives the wavelength conversion element to rotate.

7. The lighting device according to claim 4, wherein, The wavelength conversion unit is configured to switch between a first mode, a second mode, and a third mode in a time-division manner. In the third mode, incident light in the first wavelength band is wavelength-converted into light in a wavelength band different from the first wavelength band, the second wavelength band, and a specific wavelength band.

8. The lighting device according to claim 7, further comprising: The control unit controls the phase modulation unit, wherein... Assuming that the wavelength band of the emitted light in the second mode of the wavelength conversion unit is the second mode wavelength band, and the wavelength band of the emitted light in the third mode of the wavelength conversion unit is the third mode wavelength band, The control unit The system receives inputs of a second wavelength band image showing the light intensity distribution of the reproduced image to be added to the second wavelength band, a second mode wavelength band image showing the light intensity distribution of the reproduced image to be added to the second mode wavelength band, and a third mode wavelength band image showing the light intensity distribution of the reproduced image to be added to the third mode wavelength band. In the first mode, the phase modulation unit is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the second wavelength band image to the reproduced image. In the second mode, the phase modulation unit is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the second mode wavelength band image to the reproduced image. In the third mode, the phase modulation unit is controlled to perform spatial light phase modulation to add the light intensity distribution shown by the wavelength band image of the third mode to the reproduced image.

9. The lighting device according to claim 1, wherein, The phase modulation unit include A first phase modulation region, on which light in the first wavelength band is incident; In the second phase modulation region, light from a fourth wavelength band is incident on the second phase modulation region, wherein the fourth wavelength band is a wavelength band different from the second wavelength band; and In the third phase modulation region, light from the fifth wavelength band is incident on the third phase modulation region. The fifth wavelength band is different from the second and fourth wavelength bands. The reconstructed image generated by spatial light phase modulation in the first phase modulation region and formed in the wavelength conversion unit serves as the reconstructed image of the first wavelength band. The reconstructed image generated by spatial light phase modulation in the second phase modulation region and superimposed on the image plane of the reconstructed image of the second wavelength band serves as the reconstructed image of the fourth wavelength band. The reconstructed image generated by spatial light phase modulation in the third phase modulation region and superimposed on the image plane of the reconstructed image of the second wavelength band serves as the reconstructed image of the fifth wavelength band.

10. The lighting device according to claim 9, further comprising: The control unit controls the phase modulation unit, wherein... The control unit The system receives inputs of a second wavelength band image showing the light intensity distribution of a reconstructed image to be added to the second wavelength band, a fourth wavelength band image showing the light intensity distribution of a reconstructed image to be added to the fourth wavelength band, and a fifth wavelength band image showing the light intensity distribution of a reconstructed image to be added to the fifth wavelength band. The phase modulation unit is controlled such that spatial light phase modulation is performed in the first phase modulation region to add the light intensity distribution shown by the second wavelength band image to the reproduced image of the first wavelength band; spatial light phase modulation is performed in the second phase modulation region to add the light intensity distribution shown by the fourth wavelength band image to the reproduced image of the fourth wavelength band; and spatial light phase modulation is performed in the third phase modulation region to add the light intensity distribution shown by the fifth wavelength band image to the reproduced image of the fifth wavelength band.

11. The lighting device according to claim 1, further comprising: An intensity modulator performs spatial light intensity modulation on the image plane of the reproduced image of the second wavelength band.

12. The lighting device according to claim 1, wherein, The wavelength conversion unit is retroreflective.

13. The lighting device according to claim 1, wherein, The light-emitting surface in the wavelength conversion unit includes a curved surface.

Images