Lighting device and projector device

Abstract

The lighting device of the present application includes a light source unit having a light emitting element; a spatial light phase modulator that performs spatial light phase modulation on incident light from the light source unit, thereby generating a plurality of reproduced images having intervals therebetween on an image surface; and a projection unit that superimposes and projects the plurality of reproduced images on a projection surface through separate projection lenses.

Description

TECHNICAL FIELD

[0001] The present technology relates to an illumination device and a projector device, and particularly relates to a technology for enhancing safety by reducing light energy density. BACKGROUND

[0002] An illumination device that irradiates light to a non-illuminated object is widely used. Examples of the illumination device include a vehicle lamp such as a headlamp that emits light in a predetermined light distribution pattern (light intensity distribution pattern), a projector device that projects an image generated by applying a light intensity distribution to incident light from a light source by a spatial light modulator such as a liquid crystal panel to, for example, a predetermined projection surface, and the like.

[0003] Note that the following Patent Literature 1 can be cited as related conventional technology. The Figure 14 Disclosed is a configuration in which laser light emitted from a light source is collimated and emitted to an illumination region via a diffractive optical element and a projection lens, in which a diffractive optical element in which a plurality of element diffracting portions are two-dimensionally arranged is used as the diffractive optical element, a projection lens in which a plurality of unit lenses are two-dimensionally arranged is used as the projection lens, and non-adjacent element diffracting portions in the diffractive optical element illuminate the same illumination range, so that the incident direction of coherent light incident on each point of the illumination region is widened to improve the safety of the coherent light.

[0004] Prior Art Documents

[0005] Patent Literature

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2019-21471 SUMMARY

[0007] Problems to be Solved by the Invention

[0008] Here, a reproduced image to be projected can be generated by performing spatial light intensity modulation on light from a light source. Alternatively, a reproduced image can be generated by performing spatial light phase modulation on light from a light source. In the case where a reproduced image is generated by intensity modulation, a light intensity distribution is realized by shielding or dimming a part of light from a light source. Meanwhile, in the case where a reproduced image is generated by phase modulation, such shielding or dimming is not performed, and thus light use efficiency can be improved.

[0009] On the other hand, for example, in the case where a reproduced image generated on an image surface is projected on a projection surface via a projection lens like in a projector device, light energy density at a pupil position (focal plane) of the projection lens increases. In order to improve safety, it is desirable to reduce such light energy density at the pupil position. Specifically, in the case where a reproduced image is generated by the above-described phase modulation, light energy density tends to further increase, and thus it is effective to take measures.

[0010] In view of the above, the present technology has been made, and an object thereof is to reduce light energy density at a pupil position and improve safety in the case where a reproduced image is generated using a spatial light phase modulator.

[0011] Solution to the problem

[0012] An illumination device according to the present technology includes: a light source unit having a light emitting element; a spatial light phase modulator that generates a plurality of reproduced images on an image surface at a certain interval by performing spatial light phase modulation on incident light from the light source unit; and a projection unit that superimposes and projects the plurality of reproduced images on a projection surface via different projection lenses.

[0013] As a result, the reproduced images are projected on the projection surface via each pupil position dispersed for each projection lens.

[0014] In the above-described illumination device according to the present technology, it is conceivable that the spatial light phase modulator generates each reproduced image using light incident on a wider region than a region formed by equally dividing a phase modulation surface for each reproduced image.

[0015] As a result, compared to the case where a reproduced image is individually generated for each region formed by equally dividing a phase modulation surface according to the number of reproduced images, the diameter of each light beam at the pupil position can be enlarged.

[0016] The above-described illumination device according to the present technology can include a control unit that changes a position or a shape of a reproduced image by controlling a phase modulation pattern in the spatial light phase modulator.

[0017] As a change in the position of a reproduced image, a change in an in-plane direction position or a change in an optical axis direction position is considered. A position of a projection region of a reproduced image can be adjusted according to a change in an in-plane direction position, and a focal point can be adjusted according to a change in an optical axis direction position. Furthermore, an optical aberration can be corrected according to a change in a shape of a reproduced image.

[0018] In the above-described illumination device according to the present technology, it is conceivable that the control unit changes an in-plane direction position of a reproduced image.

[0019] As a result, a position of a projection region of each reproduced image can be adjusted.

[0020] In the above-described illumination device according to the present technology, it is conceivable that the control unit changes the interval in the in-plane direction of the reproduced image depending on the projection distance of the reproduced image.

[0021] Therefore, even when the projection distance changes, it is possible to prevent deviation between the projection regions of the reproduced image.

[0022] In the above-described illumination device according to the present technology, it is conceivable that the control unit changes the position of the reproduced image in the optical axis direction.

[0023] As a result, it is possible to adjust the focal point of the projected image.

[0024] In the above-described illumination device according to the present technology, it is conceivable that the control unit changes the position of the reproduced image in the optical axis direction depending on the projection distance of the reproduced image.

[0025] As a result, it is possible to compensate for the focal point shift of the projected image depending on the change in the projection distance.

[0026] In the above-described illumination device according to the present technology, it is conceivable that the control unit changes the shape of the reproduced image.

[0027] As a result, it is possible to change the shape of the reproduced image to correct optical aberrations such as lens distortion.

[0028] In the above-described illumination device according to the present technology, it is conceivable that a diffusion plate is provided between the image surface and the projection lens in the optical axis direction.

[0029] The diffusion plate enlarges the beam diameter of each light beam incident on the projection lens.

[0030] The above-described illumination device according to the present technology can include a curved optical element that curves the incident light beams from the spatial light phase modulator in a direction in which the in-plane direction interval of the reproduced image on the image surface is increased.

[0031] For example, the in-plane direction interval of the reproduced image on the image surface is increased by a curved optical element such as a prism.

[0032] Further, a projector device according to the present technology includes a light source unit having a light emitting element, a spatial light phase modulator that generates a plurality of reproduced images on an image surface at a certain interval by performing spatial light phase modulation on incident light from the light source unit, a projection unit that superimposes and projects the plurality of reproduced images on a projection surface via different projection lenses, and a spatial light intensity modulator that performs spatial light intensity modulation on the reproduced images on the image surface.

[0033] Such a projector device can also provide effects similar to those of the above-described illumination device according to the present technology. Attached Figure Description

[0034] Figure 1 This is a perspective view illustrating a schematic configuration example of the optical system included in a lighting device according to a first embodiment of the present technology.

[0035] Figure 2 This is a schematic diagram showing the configuration of the subsequent stage portion of the phase modulator 5 in the optical system included in the lighting device as a first embodiment, and the configuration of the control system for the phase modulator 5.

[0036] Figure 3 It is a diagram showing the state of a cross-section of a liquid crystal panel taken along a plane parallel to the thickness direction.

[0037] Figure 4 A diagram illustrating the relationship between the phase distribution of a spatial light phase modulator and the change in the direction of travel of the incident light beam.

[0038] Figure 5 This is an illustrative diagram illustrating the method of segmenting the phase modulation plane for each reproduced image.

[0039] Figure 6 This is a diagram schematically illustrating the shape of the wavefront of the phase distribution when segmentation is performed for each reproduced image.

[0040] Figure 7 This is a diagram showing the state of the beam when segmentation is performed for each reproduced image.

[0041] Figure 8 This is a diagram illustrating an example of the wavefront shape of the phase distribution when segmentation is not performed for each reproduced image.

[0042] Figure 9 This is a diagram showing the state of the beam without performing segmentation on each reproduced image.

[0043] Figure 10 This is a diagram illustrating an example configuration of a lighting device as a second embodiment.

[0044] Figure 11 This is a diagram illustrating an example of arranging the ranging unit with a certain distance between the optical axis of the ranging unit and the projection optical system of the reproduced image.

[0045] Figure 12 This is an explanatory diagram illustrating an example of adjusting the in-plane directional spacing of the reproduced image based on the projection distance.

[0046] Figure 13 This is also an illustrative diagram illustrating an example of adjusting the in-plane directional spacing of the reproduced image based on the projection distance.

[0047] Figure 14 is a diagram for explaining an example of adjustment of the position of each reproduced image in the optical axis direction according to the projection distance.

[0048] Figure 15 is a flowchart showing an example of a specific process to be executed to realize the control as the second embodiment.

[0049] Figure 16 is a diagram for describing a configuration example of the projector device as the embodiment.

[0050] Figure 17 is a diagram for explaining an example using a curved optical element.

[0051] Figure 18 is a diagram for explaining an example in which a ranging unit is disposed in a space generated by applying a curved optical element.

[0052] Figure 19 is a diagram for explaining a problem in a case where a spatial light phase modulator is disposed obliquely.

[0053] Figure 20 is a diagram for explaining an example applying a diffusion plate.

[0054] Figure 21 is a diagram for explaining an example applying an afocal optical system.

[0055] Figure 22 is a diagram for explaining an example in a case where a plurality of spatial light phase modulators are used.

[0056] Figure 23 is also a diagram for explaining an example in a case where a plurality of spatial light phase modulators are used. DETAILED DESCRIPTION

[0057] Hereinafter, embodiments according to the present technology will be described in the following order with reference to the accompanying drawings.

[0058] <1. First Embodiment>

[0059] (1-1. Configuration of the illumination device and the reproduced image projection method as the embodiment)

[0060] (1-2. Method of generating a reproduced image by phase modulation)

[0061] (1-3. Method of generating a plurality of reproduced images)

[0062] <2. Second Embodiment>

[0063] <3. Third Embodiment (Applied to Projector Device)>

[0064] <4. Modified Example>

[0065] <5. Summary of Embodiments>

[0066] <6. The Present Technology>

[0067] <1. First Embodiment>

[0068] (1-1. Configuration of the illumination device as an embodiment and projection method)

[0069] Figure 1 and Figure 2 is a view for describing a configuration example of an illumination device 1 as a first embodiment according to the present technology. Figure 1 is a perspective view showing a schematic configuration example of an optical system included in the illumination device 1. Figure 2 is a view showing a schematic configuration of a subsequent stage portion of a phase modulator 5 in the optical system and a configuration of a control system of the phase modulator 5.

[0070] First, as the configuration of the optical system shown in Figure 1 , the illumination device 1 includes a light source unit 2, a mirror 3, a mirror 4, the phase modulator 5, a mirror 6, a mirror 7, and a projection lens unit 8. The arrows in the drawing indicate the path of light, and the light emitted from the light source unit 2 enters the projection lens unit 8 via the mirror 3, the mirror 4, the phase modulator 5, the mirror 6, and the mirror 7.

[0071] In the illumination device 1, the phase modulator 5 performs spatial light phase modulation on the incident light from the light source unit 2 to reproduce a desired image (light intensity distribution) on a projection surface Sp. Such an illumination device 1 can be applied to various lamps for vehicle headlamps (headlights) and the like, for example. In the case of application to a headlamp, for example, it is conceivable to adopt a configuration in which the phase modulator 5 changes the irradiation range of a high beam or a low beam by spatial light phase modulation.

[0072] Here, in the following description, the projection direction of the image of the projection lens unit 8 (the direction orthogonal to the projection surface Sp) is defined as the Z direction. Further, the plane orthogonal to the Z direction (i.e., the plane parallel to the projection surface Sp) is defined as the X-Y plane. In a state in which the illumination device 1 is horizontally configured, the X direction coincides with the horizontal direction, and the Y direction coincides with the vertical direction.

[0073] The light source unit 2 includes one or a plurality of light emitting elements and functions as a light source of light incident on the phase modulator 5. Examples of the light emitting elements of the light source unit 2 include laser light emitting elements. Note that a light emitting diode (LED), a discharge lamp, or the like can also be used as the light emitting elements.

[0074] Phase modulator 5 includes, for example, a reflective liquid crystal panel and performs spatial light phase modulation on the incident light. Specifically, in this example, spatial light phase modulation is performed on light emitted from light source unit 2 and incident via reflectors 3 and 4.

[0075] Note that, as phase modulator 5, a transmissive spatial light phase modulator can be used instead of a reflective one.

[0076] It should be noted that in the following text, "spatial optical phase modulation" will also be abbreviated as "phase modulation".

[0077] Here, in the lighting device 1 of this embodiment, Figure 2 As shown, the phase modulator 5 generates multiple reconstructed images Im at certain intervals on the image surface Si by modulating the phase of the incident light. Specifically, in this example, four reconstructed images Im are generated.

[0078] The projection lens unit 8 has the same number of projection lenses 8a as the number of reconstructed images Im generated on the image surface Si (i.e., four in this example: see below). Figure 1 Each projection lens 8a projects a corresponding image Im onto the projection surface Sp. In this case, an aspherical lens is used for each projection lens 8a, and the projection lens 8a superimposes and projects the corresponding reconstructed image Im onto the projection surface Sp. Specifically, in this example, the projection lens 8a superimposes and projects the reconstructed image Im onto the same area of ​​the projection surface Sp.

[0079] As a result, multiple reconstructed images Im are generated on the image surface Si, but the projected image on the projection surface Sp becomes a single image superimposed with these reconstructed images Im.

[0080] Note that in this example, the projection lens 8a is integrally formed in the projection lens unit 8.

[0081] Here, in Figure 2 The image surface Si shown can also be referred to as the focal position (focal plane) on the light source side. Figure 2In the center, among the light beams passing through the points in the reproduced image Im, the light beam passing through the center of the image and the light beam passing through the position having the highest image height are extracted and shown. As shown, the light beams are guided from the phase modulator 5 to the image surface Si in a state of converging light via the mirrors 6 and 7, and focused on the image surface Si. The light beams focused on the image surface Si are incident on the projection lens 8a in a state of diverging light. The light beams incident on the projection lens 8a are converted into parallel light, and the traveling directions of the light beams other than the light beam at the center of the image are bent to the side of the light beam at the center of the image, whereby the chief rays of the light beams intersect with each other at the pupil position Sf.

[0082] Among the light beams passing through the pupil position Sf, the light beam at the center of the image is projected at the same position on the projection surface Sp (a set of "pl" in the figure). Similarly, for the light beams passing through the positions other than the center in the reproduced image Im, the light beams at the same positions in the reproduced image Im are also projected at the same positions on the projection surface Sp (a set of "p2" and "p3" in the figure).

[0083] As described above, since the phase modulator 5 generates a plurality of reproduced images Im at intervals on the image surface Si, and superimposes and projects the reproduced images Im on the projection surface Sp via the individual projection lenses 8a, the reproduced images Im are projected onto the projection surface Sp via each pupil position Sf allocated for each projection lens 8a.

[0084] Therefore, in the case where the phase modulator 5 is used to generate the reproduced images Im, the light energy density at the pupil position Sf can be reduced, and the safety can be improved.

[0085] In the present example, the phase modulation pattern of the phase modulator 5 can be arbitrarily set by the control unit 9.

[0086] The control unit 9 includes, for example, a microcomputer having a central processing unit (CPU) and a storage device such as a read only memory (ROM) and a random access memory (RAM), and performs overall control of the illumination device 1.

[0087] The control unit 9 sets a phase modulation pattern (a phase distribution) for generating a plurality of reproduced images Im at intervals on the image surface Si in the phase modulator 5. Specifically, the control unit 9 instructs the phase modulator 5 about the drive signal value for each pixel for realizing the above-described phase modulation pattern, and causes the phase modulator 5 to perform spatial light phase modulation on the incident light from the light source unit 2.

[0088] (1-2. Method of generating a reproduced image by phase modulation)

[0089] Reference will be made to Figure 3 andFigure 4 A method of generating a reproduced image Im by phase modulation is described.

[0090] Figure 3 is an explanatory view of a refractive effect of light by the phase modulator 5 including a liquid crystal panel. Note that, although an example of a transmissive liquid crystal panel will be described in Figure 3 , the same refractive effect can be obtained even when a reflective liquid crystal panel is used.

[0091] Figure 3 shows a cross section of a region for three pixels as a cross section of a liquid crystal panel cut along a plane parallel to the thickness direction. As shown, in the liquid crystal panel as the phase modulator 5, a pair of pixel electrodes is formed for each pixel at both ends of a liquid crystal layer.

[0092] In this liquid crystal panel, the voltage applied between the electrodes can be controlled for each pixel, and the inclination of liquid crystal molecules in the liquid crystal layer can be changed by the value of the applied voltage. Due to the inclination state of the liquid crystal molecules, the refractive index appears to differ, and the optical path length of light passing through the liquid crystal layer changes, so that a phase difference can be produced. For example, in the example shown, the optical path length is long (the refractive index is high) with the inclination state of the liquid crystal molecules of the pixel shown at the uppermost stage, and thereafter, the optical path length becomes shorter (the refractive index becomes lower) from the pixel at the middle stage to the pixel at the lower stage.

[0093] In the drawing, the polarization direction of light incident on the liquid crystal panel is indicated by a double-headed arrow, and the state in which the wavefront changes as the light advances is indicated by a vertical line. By setting the optical path length for each pixel as described above, in this case, the wavefront of the incident light gradually tilts backward from the vertical state as the incident light advances in the liquid crystal layer as shown. Thus, as indicated by the arrow in the drawing, in this case, the advancing direction of the incident light changes from the direction parallel to the panel thickness direction to the upward direction.

[0094] As described above, in the phase modulator 5, the advancing direction of the incident light can be changed by setting the optical path length (i.e., setting the phase) for each pixel.

[0095] Figure 4 shows the state of the wavefront and the change state of the advancing direction of the light beam (dotted arrow) in the case where a phase distribution as a converging (Fresnel) lens is set (A) and in the case where a phase distribution as a diffractive (prism) lens is set (B) of Figure 4 Figure 4

[0096] In Figure 4 ​​with the condensing action as shown.

[0097] In Figure 4 with the diffraction lens of B, the wavefront of the phase distribution is substantially linear as shown, and the incident light beams are refracted in the same direction. Thus, the action of in-plane position shift is obtained as shown.

[0098] By the refractive effect of light as described above, a portion in which the beam density increases and a portion in which the beam density becomes sparse can be formed on the image surface Si. That is, a desired light intensity distribution (i.e., an image) can be generated on the image surface Si by setting the phase modulation pattern of the phase modulator 5.

[0099] Note that, as a method for obtaining a phase distribution for generating a desired reproduced image Im, for example, a free-form method represented by the method disclosed in the following Reference Literature 1 or the like can be exemplified.

[0100] Reference Literature 1: Published Japanese Translation of PCT International Application No. 2017-520022

[0101] (1-3. Method of generating multiple reproduced images)

[0102] Here, as described above, in the present embodiment, multiple reproduced images Im are generated on the image surface Si. In the present example, these reproduced images Im are generated without dividing the phase modulation surface for each reproduced image Im.

[0103] This will be described with reference to Figure 5 to Figure 9 This will be described with reference to

[0104] Figure 5 is a diagram for describing a method of dividing the phase modulation surface Sm of the phase modulator 5 for each reproduced image Im when multiple reproduced images Im are generated.

[0105] Here, the phase modulation surface Sm refers to an emission surface of a portion of the phase modulator 5 that can perform phase modulation. The portion that can perform phase modulation refers to a portion that can perform phase modulation on incident light.

[0106] The four reproduced images Im to be generated are denoted by "A", "B", "C", and "D". In the method of performing division for each reproduced image Im, as Figure 5As shown in A to D of FIG. 5, the phase modulation surface Sm is equally divided for each of the reproduction images Im to be generated (the regions formed are defined as regions a, b, c, and d), and one corresponding reproduction image Im is generated for each of the equally divided regions on the image surface Si.

[0107] Figure 6 The shape of the wavefront of the phase distribution in the case where the division is performed for each of the reproduction images Im is schematically shown. Note that, Figure 6 The shape of the wavefront of the phase distribution for only the regions a and b is schematically shown.

[0108] As Figure 6 shown, the method of performing the division for each of the reproduction images Im is a method of setting the phase distribution pattern for generating the reproduction image Im for each of the regions equally divided for each of the reproduction images Im and performing the phase modulation.

[0109] Figure 7 is a diagram showing the state of the light beams in the case where the division is performed for each of the reproduction images Im. Note that, Figure 7 The light beams of only any one of the four reproduction images Im“A” to “D” are shown.

[0110] In the case where the division is performed for each of the reproduction images Im, each of the reproduction images Im is generated using the light incident on ¼ of the entire region of the phase modulation surface Sm. Since the region of the phase modulation surface Sm available for generating one reproduction image Im is relatively narrow, the diameter of each of the light beams from the phase modulator 5 tends to be narrow until the light beams reach the image surface Si, and as a result, the pupil diameter decreases.

[0111] The decrease in the pupil diameter means an increase in the light energy density at the pupil position Sf. Therefore, in the present example, the method of generating a plurality of reproduction images Im without performing the division for each of the reproduction images Im is employed.

[0112] Figure 8 An example of the shape of the wavefront of the phase distribution in the case where the division is not performed for each of the reproduction images Im is schematically shown.

[0113] In the drawing, an example of the shape of the wavefront of the phase distribution for generating the reproduction images Im of “A” and “B” is schematically shown. However, as long as the division is not performed for each of the reproduction images Im as shown, the generation of each of the reproduction images Im is not limited to within the range of the equally divided regions as Figure 5 shown, and each of the reproduction images Im can be generated using the light incident on a wider region than the range of the equally divided regions.

[0114] In the present example, since the division is not performed for each reproduced image Im, each reproduced image Im is generated using light incident on a wider area than the area formed by equally dividing the phase modulation surface Sm for each reproduced image Im.

[0115] That is, the control unit 9 of the present embodiment sets the calculated phase modulation pattern in the phase modulator 5 so as to be able to generate each reproduced image Im using light incident on a wider area than the area formed by equally dividing the phase modulation surface Sm for each reproduced image Im in this way, and causes the phase modulator 5 to perform phase modulation on the incident light from the light source unit 2.

[0116] Figure 9 is a diagram showing the state of the light beams in the case where no division is performed for each reproduced image Im, that is, in the case where the method of generating each reproduced image Im using light incident on a wider area than the area formed by equally dividing the phase modulation surface Sm for each reproduced image Im is employed. Note that, similarly to the above Figure 7 , Figure 9 only the light beams of any one of the four reproduced images Im“A” to “D” are shown.

[0117] Since the reproduced image Im is generated using light incident on a wider area than the equally divided area in this case, the diameter of each light beam from the phase modulator 5 until the light beam reaches the image surface Si tends to be larger than Figure 7 the diameter in the case where the division is performed for each reproduced image Im, and thus the pupil diameter can be enlarged.

[0118] By enlarging the pupil diameter, the light energy density at the pupil position Sf can be reduced, and safety can be enhanced.

[0119] <2. Second Embodiment>

[0120] Next, a second embodiment will be described.

[0121] In the second embodiment, the position or shape of the reproduced image Im is changed.

[0122] Figure 10 is a diagram for describing a configuration example of the illumination device 1A as the second embodiment. Note that, similarly to the above Figure 2 , Figure 10 only the configuration of the optical system after the phase modulator 5 is shown. The other parts of the optical system including the light source unit 2 are similar to those in Figure 1 , and thus are not shown.

[0123] Further, in the following description, the same reference signs are given to parts similar to those already described, and the description thereof is omitted.

[0124] The difference from the illumination device 1 of the first embodiment is that a distance measuring sensor 10 and a condenser lens 11 are added, and a control unit 9A is provided instead of the control unit 9.

[0125] The distance measuring sensor 10 measures the distance to an object in the Z direction. As the distance measuring sensor 10, for example, a distance measuring sensor by an indirect time of flight (ToF) method or a direct ToF method, a distance measuring sensor by a structured light method, or the like can be used. In the present example, a distance measuring sensor 10 by an indirect ToF method is used. In this case, the distance measuring sensor 10 receives light projected through the projection lens unit 8 and reflected by an object, and measures the distance to the object.

[0126] The condenser lens 11 converges reflected light from an object and guides the light onto the sensor surface of the distance measuring sensor 10.

[0127] Here, in the present example, the distance measuring unit including the distance measuring sensor 10 and the condenser lens 11 is arranged so that its optical axis coincides with the optical axis of the projection lens unit 8, that is, with the optical axis of the projection optical system that superimposes and projects each reproduced image Im.

[0128] Figure 11 A case where the distance measuring unit is arranged to have a certain distance between the optical axis of the distance measuring unit and the projection optical system is shown. However, with this configuration, the field of view of the distance measuring unit (distance measuring field of view) and the projection region of the reproduced image Im deviate from each other, and a so-called shadow region where light for distance measurement does not irradiate is formed in the distance measuring field of view.

[0129] By arranging the distance measuring unit so that the optical axis coincides with the optical axis of the projection optical system as described above, it is possible to prevent such a shadow region from occurring.

[0130] In Figure 10 , the control unit 9A differs from the control unit 9 in that the control unit 9A controls the phase modulation pattern for changing the in-plane direction position and the optical axis direction position of each reproduced image Im in accordance with the distance to the projection surface Sp (hereinafter referred to as "projection distance") measured by the distance measuring sensor 10 as described below.

[0131] Here, in a state where the reproduced images Im are superimposed and projected on the same region on the projection surface Sp, when the projection distance changes, a deviation occurs between the projection regions of the reproduced images Im on the projection surface Sp. That is, blurring (resolution degradation) occurs in the projected image.

[0132] Therefore, in the present example, as Figure 12 and Figure 13As shown, the in-plane direction interval of the reproduced image Im on the image surface Si changes depending on the projection distance.

[0133] Figure 12 An example of the center-to-center distance of the reproduced image Im set on the image surface Si corresponding to a projection distance of 2000 mm is shown. Figure 13 An example of the center-to-center distance of the reproduced image Im set on the image surface Si corresponding to a projection distance of 2000 mm is shown.

[0134] Specifically, in this example, as shown in Figure 12 B, the center-to-center distance of the reproduced image Im corresponding to the projection distance = 200 mm shown in A is 6.54 mm, while as shown in Figure 12 B, the center-to-center distance of the reproduced image Im corresponding to the projection distance = 2000 mm shown in A is 6.26 mm. Figure 13 Figure 13 As in this example, as the projection distance increases, the center-to-center distance of the reproduced image Im on the image surface Si increases. As a result, even if the projection distance changes, it is possible to prevent deviation between the projection regions of the reproduced image Im, and it is possible to prevent the resolution of the projected image from deteriorating due to the projection distance.

[0135] As in this example, as the projection distance increases, the center-to-center distance of the reproduced image Im on the image surface Si increases. As a result, even if the projection distance changes, it is possible to prevent deviation between the projection regions of the reproduced image Im, and it is possible to prevent the resolution of the projected image from deteriorating due to the projection distance.

[0136] Further, in the present example, in addition to this control of the center-to-center distance of the reproduced image Im, control that changes the shape of the reproduced image Im is also performed. Specifically, control is performed to change the shape of each reproduced image Im so as to achieve lens distortion correction. Note that the lens distortion referred to here is lens distortion caused by the projection lens 8a.

[0137] In this case, since the lens distortion appears as pincushion aberration, lens distortion correction is performed by changing the shape of the reproduced image, which should originally be rectangular, to a barrel shape (see B of Figure 12 and B of Figure 13 ).

[0138] Further, in the present example, control is performed to change the position of each reproduced image Im in the optical axis direction depending on the projection distance. That is, in Figure 14 , each reproduced image Im is moved in a direction indicated as direction D1 or direction D2. This corresponds to performing focus adjustment of the projected image.

[0139] Specifically, as the projection distance decreases, the control unit 9A moves each reproduced image Im in a direction away from the projection lens unit 8 (direction D2).​

[0140] As a result, the focal point shift of the projection image can be compensated according to the change in the projection distance.

[0141] Figure 15 is a flowchart showing an example of a specific process executed by the control unit 9A in order to realize the control of the above-described second embodiment.

[0142] First, in step S101, the control unit 9A reads an initial set distance. The initial set distance described here is an initial set value of the projection distance. Information indicating the initial set distance is stored in a storage device readable by the control unit 9A, and the control unit 9A executes, in step S101, a process of reading the information indicating the initial set distance stored in the storage device.

[0143] In step S102 subsequent to step S101, the control unit 9A acquires a phase modulation pattern corresponding to the distance. That is, a phase modulation pattern corresponding to the initial set distance read in step S101 or a phase modulation pattern corresponding to the distance updated in step S106 described below is acquired.

[0144] As the phase modulation pattern here, a phase modulation pattern calculated according to the projection distance as described above with reference to Figure 12 to Figure 14 is used to realize adjustment of the in-plane direction interval of the reproduced image Im, focal point adjustment (adjustment of the position in the optical axis direction), and lens distortion correction.

[0145] In the present example, information indicating the phase modulation pattern for each projection distance is stored in a storage device readable by the control unit 9A, and the control unit 9A reads and acquires the information of the phase modulation pattern stored in the storage device.

[0146] In step S103 subsequent to step S102, the control unit 9A executes phase modulation execution control using the acquired phase modulation pattern. That is, the acquired phase modulation pattern is set in the phase modulator 5 to execute phase modulation.

[0147] Then, in subsequent step S104, the control unit 9A causes the distance measuring sensor 10 to execute distance measurement as distance measurement processing, and further determines, in subsequent step S105, whether the set distance and the distance measurement value are equal, that is, whether the value of the distance measured in the distance measurement processing in step S104 is equal to the set distance (the initial set distance in step S101 or the distance value updated in step S106 described below).

[0148] In the case where it is determined in step S105 that the set distance and the distance measurement value are equal, the control unit 9A causes the process to proceed to step S107.

[0149] On the other hand, in a case where it is determined in step S105 that the set distance and the distance measurement value are not equal, the control unit 9A proceeds to step S106, updates the set distance with the distance measurement value, and causes the processing to proceed to step S107.

[0150] In step S107, the control unit 9A determines whether or not to continue adjusting the projection distance. The determination processing in step S107 functions as processing that determines whether or not the projection distance is in a changeable state after the phase modulation corresponding to the initial set distance is performed in the above-described step S103.

[0151] Various specific examples of the determination as to whether or not to continue adjusting the projection distance can be considered. For example, in a case where the control unit 9A has a function of setting the position of the projection surface Sp at an arbitrary position in the Z direction, the control unit 9A performs processing that determines whether or not the projection distance should be changed by this function. Alternatively, it is also conceivable that the projection distance is changed as the user adjusts the arrangement position of the illumination device 1A. In this case, for example, it is conceivable to perform determination as to whether or not an adjustment mode of the arrangement position is being performed.

[0152] In a case where it is determined in step S107 to continue adjusting the projection distance, the control unit 9A returns to step S102. As a result, in a case where it is estimated that the state in which the projection distance can be changed continues, if the projection distance is changed by the distance measurement (S105: No), the projection of the reproduced image Im generated with the phase modulation pattern corresponding to the changed projection distance is performed (S102, S103). That is, adjustment of the in-plane direction interval of the reproduced image Im and focus adjustment according to the changed projection distance are realized. Note that, in a case where the projection distance is not changed from the value before the distance measurement in step S104, the projection state of the reproduced image Im generated with the phase modulation pattern corresponding to the value before the distance measurement continues.

[0153] On the other hand, in a case where it is determined in step S107 not to continue adjusting the projection distance, the control unit 9A proceeds to step S108, acquires the phase modulation pattern corresponding to the distance, and then performs phase modulation execution control by the acquired phase modulation pattern in the subsequent step S109. The acquisition processing in step S108 and the control processing in step S109 are respectively the same processing as the acquisition processing in step S102 and the control processing in step S103 described above, and redundant description is avoided.

[0154] The control unit 9A terminates the series of processing shown in Figure 15 in response to the execution of the control processing of step S109.

[0155] Note that, in the above description, reading and acquiring information of the phase modulation pattern stored in advance in the storage device has been described as an example of the process of acquiring the phase modulation pattern corresponding to the projection distance (including the initial set distance of step S101). However, it goes without saying that the phase modulation pattern corresponding to the projection distance can be acquired by performing the calculation based on the above-described free-form method or the like.

[0156] <3. Third Embodiment (Applied to Projector Device)>

[0157] In the third embodiment, the illumination device as in the above-described embodiments is applied to a projector device.

[0158] Figure 16 is a diagram for describing a configuration example of a projector device 20 to which the illumination device 1 of the first embodiment is applied. Note that, in Figure 16 , similar to the Figure 2 described above, only the configuration of the optical system after the phase modulator 5 is shown, and the other parts of the optical system including the light source unit 2 are similar to those in Figure 1 , and thus are not shown.

[0159] As shown, the projector device 20 differs from the illumination device 1 of the first embodiment in that an intensity modulator 21 is provided at the position of the image surface Si and a control unit 9B is provided instead of the control unit 9.

[0160] The intensity modulator 21 includes, for example, a transmissive liquid crystal panel, and performs spatial light intensity modulation (hereinafter also simply referred to as "intensity modulation") on the incident light. Specifically, the intensity modulator 21 is disposed at the position of the image surface Si to perform intensity modulation on each of the reproduced images Im generated by the phase modulation of the phase modulator 5.

[0161] The control unit 9B, like the control unit 9, is provided with a microcomputer having a CPU and a ROM, a RAM, and the like storage device. The control unit 9B calculates a phase distribution (phase modulation pattern) of the phase modulator 5 and a light intensity distribution (intensity modulation pattern) of the intensity modulator 21 based on the target image, controls the phase modulation operation by the phase modulator 5 based on the calculated phase distribution, and controls the intensity modulation operation by the intensity modulator 21 based on the calculated light intensity distribution.

[0162] As shown, the control unit 9B includes a phase pattern calculation unit 22 and an intensity pattern calculation unit 23. The phase pattern calculation unit 22 calculates a phase modulation pattern for generating, as the target image, a plurality of reproduced images Im (four in this example) having a light intensity distribution at a certain interval on the image surface Si.

[0163] The intensity pattern calculation unit 23 calculates an intensity modulation pattern to be set in the intensity modulator 21 so as to reproduce the light intensity distribution of the target image on the projection surface Sp. Specifically, the intensity pattern calculation unit 23 inputs the target image and the phase modulation pattern calculated by the phase pattern calculation unit 22, and calculates the intensity modulation pattern of the intensity modulator 21 based on the target image and the phase modulation pattern. More specifically, the intensity pattern calculation unit 23 calculates the intensity modulation pattern of the intensity modulator 21 for eliminating the difference between the light intensity distribution of the reproduced image Im obtained from the phase modulation pattern input from the phase pattern calculation unit 22 and the light intensity distribution of the target image. This corresponds to calculating the intensity modulation pattern for compensating for the high-frequency components, because the reproducibility of the high-frequency components in the target image tends to decrease in the reproduced image Im generated by the phase modulation.

[0164] The control unit 9B causes the phase modulator 5 to perform the phase modulation operation using the phase modulation pattern calculated by the phase pattern calculation unit 22, and causes the intensity modulator 21 to perform the intensity modulation operation using the intensity modulation pattern calculated by the intensity pattern calculation unit 23.

[0165] Here, in the conventional projection apparatus, the reproduced image is obtained by performing spatial light intensity modulation on the light from the light source by the spatial light intensity modulator. However, in the spatial light intensity modulation, a part of the incident light from the light source is shielded or darkened. Therefore, there are cases where the utilization efficiency of the light is low and it is difficult to achieve high contrast.

[0166] On the other hand, as Figure 16 indicated, by using the illumination apparatus 1, that is, the projector apparatus applying the illumination apparatus that reproduces the desired light intensity distribution by spatial light phase modulation, it is possible to improve the utilization efficiency of the light and to improve the contrast of the projected image. In Figure 16 In the configuration shown in FIG. 1, the light intensity distribution corresponding to the target image is reproduced on the modulation surface of the intensity modulator 21 by the phase modulation by the phase modulator 5, which corresponds to forming the rough light intensity distribution of the target image before performing the intensity modulation of the intensity modulator 21, and is similar to the control of the area division driving of the backlight in the liquid crystal display. However, it should be noted that because the light intensity distribution here is formed by the phase modulation, it is possible to prevent the decrease in the utilization efficiency of the light from the light source.

[0167] In this case, the intensity modulator 21 functions to adjust the details of the reproduced image Im of the so-called low-frequency image reproduced by the phase modulator 5, and to reproduce the light intensity distribution corresponding to the target image on the projection surface Sp. Therefore, it is possible to increase the contrast of the projected image while suppressing the decrease in the resolution of the projected image.

[0168] Note that, as a projector device, a configuration in which the illumination device 1A of the second embodiment is applied can also be adopted. In this case, the phase pattern calculation unit 22 calculates a phase modulation pattern for adjusting the in-plane directional interval of the reproduced image Im and adjusting the focal point in accordance with the distance (projection distance) measured by the distance measuring sensor 10.

[0169] Further, in the above description, an example in which a transmissive liquid crystal panel is used as the intensity modulator 21 has been described. However, a reflective liquid crystal panel or a reflective spatial light modulator such as a DMD can also be used.

[0170] <4. Modified Example>

[0171] Here, the embodiments are not limited to the specific examples described above, and structures of various modified examples can be adopted.

[0172] For example, the optical system can include a curved optical element 15 as shown in Figure 17 The curved optical element 15 curves the incident light beam from the phase modulator 5 in a direction in which the in-plane directional interval of the reproduced image Im on the image surface Si is increased, and, for example, a prism can be used.

[0173] By increasing the in-plane directional interval of the reproduced image Im, in a case in which components need to be arranged in the vicinity of the optical axis of the projection optical system that superimposes and projects the reproduced image Im, the space for arranging the components can be enlarged, and the components can be easily arranged.

[0174] For example, as shown in Figure 18 The distance measuring unit (distance measuring sensor 10 and condenser lens 11) described in the second embodiment can be easily arranged at a position in the vicinity of the optical axis.

[0175] Note that, in a case in which the in-plane directional interval of the reproduced image Im is increased by the curved optical element 15, a configuration in which the projection lens 8a is separated as in the projection lens unit 8' shown in Figure 17 and Figure 18 can also be adopted.

[0176] Further, the components arranged in the space generated by increasing the in-plane directional interval of the reproduced image Im are not limited to the distance measuring unit described above, and, for example, other components such as an imaging unit including an image sensor that captures an image and an imaging lens can be used.

[0177] Further, in the above description, an example in which a reflective liquid crystal panel is used as the phase modulator 5 has been described. However, in a case in which a reflective spatial light phase modulator is used as the phase modulator 5, the phase modulation surface Sm is arranged to be tilted from a state orthogonal to the incident optical axis. Therefore, as shown in Figure 19 A and Figure 19A and B of FIG. 6A and FIG. 6B, the distance from the phase modulation surface Sm to the reproduced image Im varies depending on the region of the phase modulation surface Sm on which the modulation is received.

[0178] Specifically, Figure 19 A of FIG. 6A and Figure 19 B of FIG. 6B show that the phase modulator 5 is arranged so that the phase modulation surface Sm is inclined with respect to a plane So orthogonal to the optical axis of incidence. In this case, the distance from the phase modulation surface Sm to the reproduced image Im differs between light modulated in a region Al shown in A of FIG. 6A and light modulated in a region A2 shown in B of FIG. 6B. Figure 19 Figure 19 Specifically, the distance to the reproduced image Im in B of FIG. 6B is longer than that in A of FIG. 6A. Figure 19 Figure 19

[0179] Therefore, in the case where the phase modulator 5 is arranged obliquely as described above, the reproduced image Im is generated using a phase modulation pattern calculated so as to eliminate the distance difference. As a result, the position of the reproduced image Im in the Z direction can be aligned.

[0180] Moreover, the configuration of the optical system can employ the configuration as shown in Figure 20 or Figure 21

[0181] Figure 20 An example in which a diffusion plate 16 is applied is shown.

[0182] Specifically, the diffusion plate 16 is arranged in the position between the image surface Si and the projection lens 8a in the optical axis direction.

[0183] The diffusion plate 16 enlarges the beam diameter of each light beam incident on the projection lens 8a, and as a result, the pupil diameter can be enlarged.

[0184] Figure 21 An example in which an afocal optical system 17 is applied is shown.

[0185] As shown, by arranging the afocal optical system 17 before the image surface Si, each reproduced image Im is enlarged.

[0186] Further, in the above description, an example in which only one phase modulator 5 is used to generate a plurality of reproduced images Im has been described. However, as shown in Figure 22 and Figure 23 , a plurality of phase modulators 5 can be provided, and each phase modulator 5 can generate a plurality of reproduced images Im at intervals on the image surface Si. Here, in Figure 23 , only the light beams output from one phase modulator 5 among the light beams shown in Figure 22 are extracted and shown. ​​​​

[0187] As described above, by providing a plurality of phase modulators 5 and configuring each phase modulator 5 to generate a plurality of reproduced images Im, light from the light source unit 2 can be incident on the plurality of phase modulators 5 in a dispersed manner, and the light energy density can be reduced. Therefore, it is possible to extend the life of the phase modulator 5.

[0188] Further, although not shown, a configuration in which a plurality of phase modulators 5 corresponding to the wavelength of the light source are provided, each phase modulator 5 generates a plurality of reproduced images Im at intervals on the image surface Si, and these reproduced images Im are superimposed on the projection surface Sp can also be employed. For example, it is conceivable to provide red (R), green (G), and blue (B) light sources as the light source, and to provide R, G, and B phase modulators 5 as the phase modulator 5, and each phase modulator 5 generates a plurality of reproduced images Im at intervals on the image surface Si based on incident light from the light source of the corresponding color, and superimposes these reproduced images Im on the projection surface Sp through the projection lens unit 8.

[0189] <5. Summary of Embodiments>

[0190] As described above, the illumination device (illumination device 1, 1A, projector device 20) of the embodiments includes: a light source unit (light source unit 2) having a light emitting element; a spatial light phase modulator (phase modulator 5) that generates a plurality of reproduced images at intervals on an image surface by performing spatial light phase modulation on incident light from the light source unit; and a projection unit (projection unit 8, 8') that superimposes and projects the plurality of reproduced images on a projection surface via different projection lenses.

[0191] As a result, the reproduced images are projected on the projection surface via each pupil position dispersed for each projection lens.

[0192] Therefore, in the case where the reproduced images are generated using the spatial light phase modulator, the light energy density at the pupil position can be reduced, and the safety can be improved.

[0193] Further, in the illumination device of the embodiments, the spatial light phase modulator generates each reproduced image using light incident on a wider region than the region formed by equally dividing the phase modulation surface for each reproduced image.

[0194] As a result, compared to the case where the reproduced images are individually generated for each region formed by equally dividing the phase modulation surface according to the number of reproduced images, the diameter of each light beam at the pupil position can be enlarged.

[0195] Therefore, the pupil diameter is increased, the light energy density at the pupil position can be reduced, and the safety can be improved.

[0196] Further, the illumination device of the present embodiment includes a control unit (control unit 9A) that changes the position or shape of the reproduced image by controlling the phase modulation pattern in the spatial light phase modulator.

[0197] As the change in the position of the reproduced image, a change in the in-plane direction position or a change in the optical axis direction position is considered. The position of the projection region of the reproduced image can be adjusted according to the change in the in-plane direction position, and the focal point can be adjusted according to the change in the optical axis direction position. Further, the optical aberration can be corrected according to the change in the shape of the reproduced image.

[0198] According to the above-described configuration, since the adjustment and correction of the reproduced image are performed by controlling the phase modulation pattern, the need for an optical element for adjustment and correction provided independently of the spatial light phase modulator can be eliminated, and the size of the optical system can be reduced.

[0199] Further, in the illumination device of the present embodiment, the control unit changes the in-plane direction position of the reproduced image.

[0200] As a result, the position of the projection region of each reproduced image can be adjusted.

[0201] Therefore, even in a case where the projection region of the reproduced image deviates from the desired position due to some factor, the position of the projection region can be corrected to coincide with the desired position.

[0202] Further, in the illumination device of the present embodiment, the control unit changes the interval in the in-plane direction of the reproduced image according to the projection distance of the reproduced image.

[0203] Therefore, even when the projection distance changes, it is possible to prevent deviation between the projection regions of the reproduced images.

[0204] Therefore, it is possible to prevent the resolution of the reproduced images on the projection surface from deteriorating due to a change in the projection distance.

[0205] Further, in the illumination device of the present embodiment, the control unit changes the position of the reproduced image in the optical axis direction.

[0206] As a result, the focal point of the projection image can be adjusted.

[0207] Further, in the illumination device of the present embodiment, the control unit changes the position of the reproduced image in the optical axis direction according to the projection distance of the reproduced image.

[0208] As a result, it is possible to compensate for the shift of the focal point of the projection image according to a change in the projection distance.

[0209] Accordingly, it is possible to prevent the resolution of the reproduced image on the projection surface from deteriorating due to a change in the projection distance. Furthermore, the need for a configuration for driving the lens to adjust the focal point of the reproduced image is eliminated, and the optical system can be miniaturized.

[0210] Furthermore, in the illumination device as an embodiment, the control unit changes the shape of the reproduced image.

[0211] As a result, it is possible to change the shape of the reproduced image to correct optical aberrations such as lens distortion.

[0212] The optical aberrations of the reproduced image can be corrected by the spatial light phase modulator used to generate the reproduced image, and there is no need to provide a separate optical element for correction. Accordingly, the optical system can be miniaturized.

[0213] Furthermore, in the illumination device as an embodiment, a diffusion plate (diffusion plate 16) is arranged in the optical axis direction between the image surface and the projection lens.

[0214] The diffusion plate enlarges the beam diameter of each light beam incident on the projection lens.

[0215] Accordingly, the pupil diameter can be enlarged, and safety can be improved by reducing the light energy density at the pupil position.

[0216] Furthermore, the illumination device of the present embodiment includes a curved optical element (curved optical element 15) that curves the incident light beams from the spatial light phase modulator in a direction in which the in-plane direction interval of the image reproduced on the image surface is increased.

[0217] For example, the in-plane direction interval of the reproduced image on the image surface is increased by a curved optical element such as a prism.

[0218] By increasing the in-plane direction interval of the reproduced image, in the case where a component needs to be arranged in the vicinity of the optical axis of the projection optical system that superimposes and projects the reproduced image, the space for arranging the component can be enlarged, and the component can be easily arranged. For example, in the case where a distance measuring sensor is arranged, in order to prevent deviation between the field of view of the distance measurement and the projection region of the reproduced image, it is necessary to arrange the distance measuring sensor in a position in the vicinity of the optical axis. In this case, the ease of arrangement of the distance measuring sensor can be improved.

[0219] Further, a projector device (projector device 20) as an embodiment includes a light source unit (light source unit 2) having a light emitting element, a spatial light phase modulator (phase modulator 5) that generates a plurality of reproduced images at intervals on an image surface by performing spatial light phase modulation on incident light from the light source unit, a projection unit (projection unit 8, 8') that superimposes and projects the plurality of reproduced images on a projection surface via different projection lenses, and a spatial light intensity modulator (intensity modulator 21) that performs spatial light intensity modulation on the reproduced images on the image surface.

[0220] Such a projection device can also provide similar effects to the illumination device according to the above-described embodiment.

[0221] Therefore, with regard to a projector device that performs spatial light intensity modulation on a reproduced image generated by spatial light phase modulation and projects the reproduced image on a projection surface, the light energy density at the pupil position can be reduced and safety can be improved.

[0222] Note that the effects described in this specification are merely examples and are not limited. Other effects can be obtained.

[0223] <6. The present technology>

[0224] Note that the present technology can also be configured in the following way. (1)

[0226] An illumination device includes:

[0227] a light source unit having a light emitting element;

[0228] a spatial light phase modulator that generates a plurality of reproduced images at intervals on an image surface by performing spatial light phase modulation on incident light from the light source unit; and

[0229] a projection unit that superimposes and projects the plurality of reproduced images on a projection surface via different projection lenses. (2)

[0231] The illumination device according to (1) above, in which

[0232] The spatial light phase modulator generates each of the reproduced images using light incident on a region wider than a region formed by equally dividing a phase modulation surface for each of the reproduced images. (3)

[0234] The illumination device according to (1) or (2) above, further including

[0235] The control unit changes a position or a shape of the reproduced image by controlling a phase modulation pattern in the spatial light phase modulator. (4)

[0237] The illumination device according to (3) above, wherein

[0238] The control unit changes a position in a planar direction of the reproduced image. (5)

[0240] The illumination device according to (4) above, wherein

[0241] The control unit changes an interval in a planar direction of the reproduced image according to a projection distance of the reproduced image. (6)

[0243] The illumination device according to any one of (3) to (5) above, wherein

[0244] The control unit changes a position in an optical axis direction of the reproduced image. (7)

[0246] The illumination device according to (6) above, wherein

[0247] The control unit changes a position in an optical axis direction of the reproduced image according to a projection distance of the reproduced image. (8)

[0249] The illumination device according to any one of (3) to (7) above, wherein

[0250] The control unit changes a shape of the reproduced image. (9)

[0252] The illumination device according to any one of (1) to (8) above, wherein

[0253] A diffusion plate is provided between the image surface and the projection lens in an optical axis direction. (10)

[0255] The illumination device according to any one of (1) to (9) above, further comprising

[0256] A bending optical element that bends an incident light beam from the spatial light phase modulator in a direction that increases an interval in a planar direction of the reproduced image on the image surface. (11)

[0258] An illuminating device, comprising:

[0259] A light source unit having a light emitting element;

[0260] a spatial light phase modulator that generates a plurality of reproduced images at intervals on an image surface by performing spatial light phase modulation on incident light from the light source unit;

[0261] a projection unit that superimposes and projects the plurality of reproduced images on a projection surface via different projection lens; and

[0262] a spatial light intensity modulator that performs spatial light intensity modulation on the reproduced images on the image surface.

[0263] List of Reference Signs

[0264] 1, 1A illumination device

[0265] 2 light source unit

[0266] 3, 4, 6, 7 mirror

[0267] 5 phase modulator

[0268] 8, 8' projection lens unit

[0269] 8a projection lens

[0270] 9, 9A, 9B control unit

[0271] 10 distance measuring sensor

[0272] 11 condenser lens

[0273] Sp projection surface

[0274] Si image surface

[0275] Sf pupil position

[0276] Im reproduced image

[0277] Sm phase modulation surface

[0278] 15 curved optical element

[0279] 16 diffusion plate

[0280] 17 afocal optical system

[0281] 20 projection device

[0282] 21 intensity modulator

Claims

1. A lighting device, comprising: The light source unit has a light-emitting element; A spatial light phase modulator generates multiple reconstructed images at certain intervals on an image surface by performing spatial light phase modulation on the incident light from the light source unit. as well as The projection unit includes multiple projection lenses, the number of which is the same as the number of generated reproducible images. Each projection lens projects a corresponding one of the generated reproducible images onto the projection surface. The projection unit superimposes and projects multiple reproducible images onto the projection surface via different projection lenses.

2. The lighting device according to claim 1, wherein, The spatial light phase modulator generates each of the reproduced images using light incident on a region that is wider than the region formed by equally dividing the phase modulation surface for each reproduced image.

3. The lighting device according to claim 1, further comprising: The control unit changes the position or shape of the reproduced image by controlling the phase modulation pattern in the spatial light phase modulator.

4. The lighting device according to claim 3, wherein, The control unit changes the in-plane orientation position of the reproduced image.

5. The lighting device according to claim 4, wherein, The control unit changes the spacing of the reproduced images in the in-plane direction according to the projection distance of the reproduced images.

6. The lighting device according to claim 3, wherein, The control unit changes the position of the reproduced image along the optical axis.

7. The lighting device according to claim 6, wherein, The control unit changes the position of the reproduced image along the optical axis according to the projection distance of the reproduced image.

8. The lighting device according to claim 3, wherein, The control unit changes the shape of the reproduced image.

9. The lighting device according to claim 1, wherein, A diffuser plate is disposed between the image surface and the projection lens along the optical axis.

10. The lighting device according to claim 1, further comprising: A bending optical element bends the incident light beam from the spatial light phase modulator in a direction that increases the in-plane directional spacing of the reproduced image on the image surface.

11. A projector device, comprising: The light source unit has a light-emitting element; A spatial light phase modulator generates multiple reconstructed images at certain intervals on an image surface by performing spatial light phase modulation on the incident light from the light source unit. The projection unit includes multiple projection lenses, the number of which is the same as the number of generated reproducible images. Each projection lens projects a corresponding one of the generated reproducible images onto the projection surface. The projection unit also superimposes and projects multiple reproducible images onto the projection surface via different projection lenses. as well as A spatial light intensity modulator performs spatial light intensity modulation on the reproduced image on the image surface.

Images