JP2016110813A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily change an illumination mode in an arbitrary region in a predetermined range to be illuminated, without making a configuration of an optical system complex.SOLUTION: A luminaire 1 includes: a coherent light source 4 for emitting a plurality of coherent light beams; a light emission timing control part 5 for controlling light emission timing of the plurality of coherent light beams; an optical element 3 for diffusing the plurality of coherent light beams in which the light emission timing is controlled, and for illuminating a predetermined range; a light scan member 6 for scanning the plurality of coherent light beams on the optical element; a detection part 21 for detecting an illumination object existing in one part of the region in the predetermined range. The optical element 3 has a plurality of diffusion regions in which the coherent light is made incident, and the plurality of diffusion regions have a plurality of element diffusion regions. The plurality of element diffusion regions illuminate a partial region in the predetermined range by the diffusion of the coherent light made incident. By the control of the light emission timing, illumination is performed in a first illumination mode with respect to the illumination object detected by the detection part 21, and illumination is performed in a second illumination mode with respect to the other regions.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an illumination device that illuminates a predetermined range using coherent light.

  In recent years, illumination devices including a laser light source that emits coherent light (laser light) are becoming widespread. Since a laser light source generally has a high emission intensity, it is easy to suppress the optical system to a small size even when it is desired to sufficiently secure the emission intensity. In addition, the laser light source has an advantage of long life and low power consumption.

  The laser light source has a problem of speckle generation. However, in Patent Document 1, the incident direction of the laser light incident on each point in the illuminated area is changed in time by periodically changing the traveling direction of the coherent light. Changing technology is disclosed. According to this technique, speckle can be made inconspicuous.

International Publication 2012/033174 Pamphlet

  By the way, if it is possible to arbitrarily change the color of the area illuminated by the lighting device or arbitrarily change a part of the color of the area in a spot manner, effective illumination in various fields is possible. Can be done. For example, when lighting as described above is performed in a stadium, a concert hall, or the like, it is possible to enhance the production effect. Specifically, for example, in a soccer game or the like, if the illumination color of the ball is spot-different from the surrounding color, it is considered that an attractive performance can be provided to spectators and the like.

  When the illumination as described above is realized in an illumination device including a laser light source, with respect to changing the color, a plurality of laser beams having different emission wavelength ranges are overlapped or laser beams having a specific emission wavelength range are combined. Can be realized by irradiating the phosphor with a wavelength and performing wavelength conversion. In addition, it is possible to change the color of a part of the illuminated area in a spot manner, for example, by providing a separate laser light source with a small beam diameter in addition to the laser light source that illuminates the entire area of the illuminated area. It is.

  However, providing a separate laser light source as described above complicates the configuration of the optical system of the illumination device.

  The present invention has been made in consideration of the above points, and provides an illuminating device capable of arbitrarily changing the illumination mode of an arbitrary region within a predetermined range to be illuminated without complicating the configuration of the optical system. It is to be.

  In order to solve the above-described problems, the present invention provides a coherent light source that emits a plurality of coherent lights having different emission wavelength ranges, a light emission timing control unit that individually controls the light emission timings of the plurality of coherent lights, An optical element that illuminates a predetermined range by diffusing the plurality of coherent lights whose emission timings are controlled by the light emission timing control unit, and light that scans the plurality of coherent lights from the coherent light source on the optical elements A scanning member and an illumination target detection unit that detects an illumination target existing in a partial region within the predetermined range, and the optical element is provided corresponding to each of the plurality of coherent lights. A plurality of diffusion regions into which coherent light is incident, and each of the plurality of diffusion regions includes an incident coherence The predetermined range can be illuminated by light diffusion, each of the plurality of diffusion regions has a plurality of element diffusion regions, and each of the plurality of element diffusion regions is formed by diffusion of incident coherent light. Illuminating a partial region within the predetermined range, and at least a part of the partial region illuminated by each of the plurality of element diffusion regions is different, and the light emission timing control unit is configured to detect the illumination target. A second illumination mode different from the first illumination mode is applied to the illumination target detected by the unit in the first illumination mode and other regions within the predetermined range are illuminated. Illumination apparatus that individually controls the light emission timings of the plurality of coherent lights so that illumination is performed or no illumination is performed.

  In the illuminating device, the optical scanning member periodically scans the plurality of coherent lights from the coherent light source on an incident surface of the optical element, and the light emission timing control unit is configured by the optical scanning member. The emission timings of the plurality of coherent lights may be individually controlled independently of the scanning timings of the plurality of coherent lights.

  The illumination target may be a stationary object or a moving object that exists within the predetermined range.

  Further, the illumination object is an area defined at a predetermined position within the predetermined range, and an area for forming a geometric shape within the predetermined range by being illuminated in an illumination mode different from other areas. It may be.

  The optical element may be a hologram recording medium, and each of the plurality of element diffusion regions may be an element hologram region in which different interference fringe patterns are formed.

  The optical element may be a lens array group having a plurality of lens arrays, and each of the plurality of element diffusion regions may have the lens array.

  ADVANTAGE OF THE INVENTION According to this invention, the illumination apparatus which can change arbitrarily the illumination aspect of the arbitrary area | regions within the predetermined range to illuminate, without complicating the structure of an optical system can be provided.

It is the schematic which shows the installation state of the illuminating device by one Embodiment of this invention. It is a figure which shows schematic structure of the illuminating device by embodiment. It is a figure explaining the optical scanning member of the illuminating device by embodiment. It is a figure which shows a mode that the laser beam diffused with the optical element of the illuminating device by embodiment illuminates the predetermined range. It is a figure which shows the example which makes the illumination color of the center part of the predetermined range illuminated by the illuminating device by embodiment differ from the illumination color of another part. It is a figure which shows the example which makes non-illuminating only the center part of the predetermined range which the illuminating device by embodiment illuminates. In (A) to (C), the illumination device according to the embodiment is illuminated so as to track a moving object that is an illumination target detected within a predetermined range, and the illumination mode is different from the illumination modes of other regions. FIG. (A)-(C) are the figures which showed the example of FIG. 7 from another angle. (A)-(C) are the areas | regions which form a geometric shape in a predetermined range by the illumination object in the predetermined range illuminated by the illuminating device by embodiment being illuminated by the illumination aspect different from another area | region. It is a figure which shows the example which changed the illumination aspect of the illumination object with another area | region, and formed the geometric shape in a certain case. It is a figure which arranges three hologram fields adjacent along the entrance plane of a hologram recording medium. It is a figure which arranges three hologram fields in the lamination direction.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  FIG. 1 is a schematic diagram showing an installation state of a lighting device 1 according to an embodiment of the present invention, and FIG. 2 is a diagram showing a schematic configuration of the lighting device 1. In FIG. 1, a symbol F indicates an illumination target area irradiated with light from the illumination device 1, and the illumination apparatus 1 is installed above the illumination target area F in the present embodiment. As shown in FIG. 1, in this example, the illumination device 1 illuminates a predetermined area 10 from above to illuminate a part of the illumination target area F.

  The illumination target area F described above is an area including a competition area (for example, a tennis court) of a stadium, for example. In this case, the lighting device 1 illuminates the predetermined area 10 by illuminating the predetermined area 10. May be. The illumination target area F may be, for example, an area including a stage such as a concert hall. In this case, the illumination device 1 may illuminate the stage by illuminating the predetermined range 10. In addition, the object which the illuminating device 1 illuminates is not limited to the example demonstrated above.

  Hereinafter, the configuration of the illumination device 1 will be described in detail. As illustrated in FIG. 2, the illumination device 1 includes an irradiation device 2, an optical element 3, and an illumination target detection unit 21. Among these, the irradiation device 2 includes a laser light source 4, a light emission timing control unit 5, and an optical scanning member 6.

  The laser light source 4 corresponds to the coherent light source referred to in the present invention, and includes a plurality of light source units 7 that emit a plurality of coherent light beams having different emission wavelength ranges, that is, laser beams. The plurality of light source units 7 may be provided independently, or may be a light source module in which a plurality of light source units 7 are arranged side by side on a common substrate. The laser light source 4 of this embodiment should just have the at least 2 light source part 7 from which each light emission wavelength range differs, and the kind of light emission wavelength range should just be 2 or more. In order to increase the emission intensity, a plurality of light source units 7 may be provided for each emission wavelength region.

  For example, when the laser light source 4 includes a light source unit 7r in the red light emission wavelength region, a light source unit 7g in the green light emission wavelength region, and a light source unit 7b in the blue light emission wavelength region, these light source units 7 By superimposing the three laser beams emitted by, white illumination light can be generated.

  The light emission timing control unit 5 individually controls the light emission timings of the plurality of laser beams having different emission wavelength ranges in synchronization with the scanning timing of the plurality of laser beams by the optical scanning member 6. That is, when a plurality of light source units 7 are provided corresponding to a plurality of laser beams having different emission wavelength ranges, the light emission timing control unit 5 sets the emission timing for emitting the laser beams from the plurality of light source units 7. Control is performed for each light source unit 7. As described above, when the laser light source 4 can emit three laser beams of red, blue, and green, by controlling the emission timing of each laser beam, one or more colors of red, blue, and green can be mixed. It becomes possible to generate illumination light of a combined color.

  The light emission timing control unit 5 may control whether or not to emit laser light from each light source unit 7, that is, on / off of light emission, and the laser beam emitted from each light source unit 7 may be used as the optical scanning member 6. Whether the light is guided to the incident surface may be switched. In the latter case, an optical shutter unit (not shown) may be provided between each light source unit 7 and the optical scanning member 6, and the passage / blocking of the laser light may be switched by this optical shutter unit.

  The optical scanning member 6 changes the traveling direction of the laser light from the laser light source 4 over time so that the traveling direction of the laser light does not become constant. As a result, the laser light emitted from the optical scanning member 6 scans the incident surface of the optical element 3.

  For example, as shown in FIG. 3, the optical scanning member 6 includes a reflection device 13 that can rotate around two rotation axes 11 and 12 that are parallel to the directions intersecting each other. The laser light from the laser light source 4 incident on the reflection surface 13a of the reflection device 13 is reflected at an angle corresponding to the inclination angle of the reflection surface 13a and travels in the direction of the incident surface 3a of the optical element 3. By rotating the reflection device 13 around the two rotation axes 11 and 12, the laser beam scans the incident surface 3a of the optical element 3 two-dimensionally. For example, the reflection device 13 repeats the operation of rotating around the two rotation axes 11 and 12 at a constant period. Therefore, the laser light repeatedly two-dimensionally scans the incident surface 3a of the optical element 3 in synchronization with this period. .

  In the present embodiment, it is assumed that only one optical scanning member 6 is provided, and a plurality of laser beams emitted from the laser light source 4 are incident on the common optical scanning member 6 and this optical scanning is performed. The traveling direction of the member 6 is changed with time, and the optical element 3 is scanned.

  The optical element 3 has an incident surface 3a on which a plurality of laser beams are incident, and the predetermined range 10 is illuminated by diffusing the plurality of laser beams incident on the incident surface 3a.

  Here, in the present embodiment, the predetermined range 10 illuminated by the lighting device 1 is a so-called far field illumination range. Such a far-field illumination range is often expressed as a diffusion angle distribution in an angular space located closer to the optical element 3 than the far-field illumination range. Such an angular space may be referred to as a near-field illuminated area. In this near field illuminated area, a diffusion angle distribution for illuminating the predetermined range 10 with a desired area is defined. When designing the optical element 3 for illuminating the predetermined range 10, the diffusion angle distribution may be determined in the far-field illumination range, or the diffusion angle distribution may be determined in the near-field illuminated region.

  FIG. 4 is a diagram illustrating a state in which the laser beam diffused by the optical element 3 is incident on the predetermined range 10. The optical element 3 has a plurality of diffusion regions 14 corresponding to a plurality of laser beams. Corresponding laser light is incident on each diffusion region 14. Each diffusion region 14 diffuses the incident laser light and illuminates the entire area of the predetermined range 10 as a whole. Each diffusion region 14 has a plurality of element diffusion regions 15. Each element diffusion region 15 diffuses the incident laser light and illuminates the partial region 19 within the predetermined range 10. Here, at least a part of the partial region 19 is different for each element diffusion region 15.

  The optical element 3 is configured using, for example, a hologram recording medium 16. The hologram recording medium 16 has a plurality of hologram regions 17 as shown in FIG. Each hologram region 17 is provided corresponding to each of a plurality of laser beams having different emission wavelength ranges. Each hologram region 17 has an incident surface 17a on which a corresponding laser beam is incident. Each of the laser beams that are incident and diffused on the incident surface 17 a of each hologram region 17 illuminates the predetermined range 10. For example, when the hologram recording medium 16 has three hologram regions 17, the laser light diffused in each hologram region 17 illuminates the entire range of the predetermined range 10.

  FIG. 4 shows an example in which three hologram regions 17 are provided in association with three laser beams that emit red, blue, or green. However, the hologram recording medium 16 according to the present embodiment has different emission wavelength ranges. It suffices to have two or more hologram regions 17 in association with two or more laser beams. As shown in FIG. 4, when the hologram recording medium 16 has three hologram regions 17 corresponding to three laser beams that emit red, blue, or green, each hologram region 17 illuminates the entire range of the predetermined range 10. For this reason, when three laser beams are emitted, the predetermined range 10 is illuminated in white.

  The size or area of each hologram region 17 in the hologram recording medium 16 is not necessarily the same. Even if the size of each hologram area 17 is different, each hologram area 17 illuminates a common predetermined range 10 by adjusting the interference fringes formed on the incident surface 17a of each hologram area 17 for each hologram area 17. can do.

  Each of the plurality of hologram areas 17 has an element hologram area 18 corresponding to the plurality of element diffusion areas. Each of the plurality of element hologram regions 18 illuminates the partial region 19 within the predetermined range 10 by diffusing the incident laser light. At least a part of the partial area 19 illuminated by each element hologram area 18 is different for each element hologram area 18. That is, the partial areas 19 illuminated by the different element hologram areas 18 are at least partially different.

  An interference fringe pattern is formed on the incident surface 17 a of each element hologram region 18. Therefore, the laser light incident on the incident surface 17 a of each element hologram region 18 is diffracted by the interference fringe pattern on the incident surface 17 a to illuminate the corresponding partial region 19 on the predetermined range 10. By adjusting the interference fringe pattern in various ways, the traveling direction of the laser light diffracted, that is, diffused in each element hologram region 18 can be changed.

  Thus, the laser light incident on each point in each element hologram area 18 illuminates the corresponding partial area 19. Moreover, the optical scanning member 6 changes the incident position and incident angle of the laser light incident on each element hologram region 18 over time. The laser light incident in one element hologram area 18 illuminates the common partial area 19 regardless of the position in the element hologram area 18. This means that the incident angle of the laser light incident on each point of the partial region 19 changes with time. The change in the incident angle is a speed that cannot be resolved by the human eye, and as a result, a non-correlated coherent light scattering pattern is multiplexed and observed in the human eye. Therefore, speckles generated corresponding to each scattering pattern are overlapped and averaged and observed by an observer. As a result, speckles are less noticeable in the illuminated area 10. Further, since the laser light from the optical scanning member 6 scans each element hologram area 18 on the hologram recording medium 16 in order, the laser light diffracted at each point in each element hologram area 18 has a different wavefront. These laser beams are superimposed on the predetermined range 10 independently, so that a uniform illuminance distribution with inconspicuous speckles is obtained in the predetermined range 10.

  In FIG. 4, each element hologram area 18 illuminates a different partial area 19 within the predetermined range 10, but a part of the partial area 19 may overlap with the adjacent partial area 19. Further, the size of the partial area 19 may be different for each element hologram area 18. Furthermore, the corresponding partial areas 19 do not have to be arranged within the predetermined range 10 in accordance with the arrangement order of the element hologram areas 18. That is, the arrangement order of the element hologram areas 18 in the hologram area 17 and the arrangement order of the corresponding partial areas 19 in the predetermined range 10 do not necessarily need to match.

  Next, the illumination target detection unit 21 will be described. The illumination target detection unit 21 detects an illumination target existing in a partial region within the predetermined range 10 illuminated by the optical element 3. Here, the illumination target is, for example, a stationary object or a moving object existing within the predetermined range 10 or an area defined at a predetermined position within the predetermined range 10 and is illuminated in a manner different from other areas. This is a region for forming a geometric shape within the predetermined range 10. Specifically, the illumination target detection unit 21 according to the present embodiment is configured such that when the predetermined range 10 is viewed from the optical element 3 and the illumination target such as an object exists within the predetermined range 10, the illumination target is predetermined. It is determined that it exists in a part of the area 10. Therefore, for example, even when the illumination target 1 illuminates the predetermined range 10 and the object that is the illumination target floats on a partial area of the illuminated illumination target area F, the optical element 3 determines the predetermined range. When the range 10 is viewed, if the object is located within the predetermined range 10, the illumination target detection unit 21 detects the object.

  The illumination target detection unit 21 may be a sensor that optically detects the illumination target. For example, the presence or absence of the illumination target and the position and size of the illumination target may be detected by irradiating infrared rays from the sensor to the predetermined range 10 and whether or not the reflected light is detected within a predetermined time by the sensor. . Or the image of the predetermined range 10 is image | photographed with a camera, The captured image may be analyzed by image recognition, such as pattern matching, and the presence or absence of an illumination target and the position and size of an illumination target may be detected.

  Here, when the illumination target is detected by the illumination target detection unit 21, the light emission timing control unit 5 of the present embodiment has an illumination mode for the illumination target according to the position and size of the illumination target. The light emission timings of the plurality of light source units 7 can be controlled so as to be different from the illumination mode for other regions. Specifically, the light emission timing control unit 5 illuminates the illumination target detected by the illumination target detection unit 21 in the first illumination mode, and for other regions within the predetermined range 10 The light emission timing of the plurality of coherent lights can be individually controlled so that the illumination is performed in the second illumination mode different from the first illumination mode, or the illumination is not performed. .

  The illuminating device 1 according to the present embodiment having the above-described configuration performs illumination control that changes a part of the illumination color within the predetermined range 10 or prevents only a part of the predetermined range 10 from being illuminated. Can be done. In particular, in the present embodiment, the illumination target detected by the illumination target detection unit 21 is illuminated in the first illumination mode, and the other areas within the predetermined range 10 are the first Illumination can be performed in a second illumination mode different from the illumination mode, or no illumination can be performed. In addition, when the illumination target detected by the illumination target detection unit 21 moves, it is possible to perform illumination by tracking the target. Thus, effective illumination can be performed.

  5 and 6 show an example in which the illumination mode of the central portion 10a in the predetermined range 10 is different from the illumination mode of other parts in the predetermined range 10. FIG.

  In the example of FIG. 5, the hologram recording medium 16 has three hologram regions 17 corresponding to three laser beams that emit light in red, green, or blue. The red hologram region 17 covers the entire region with the corresponding laser beams. The green and blue hologram regions 17 are scanned with the corresponding laser light except for a part thereof. In FIG. 5, a portion of each hologram region 17 where the corresponding laser beam is not scanned is shown in white. These white portions correspond to the central portion 10 a in the predetermined range 10. Since the red laser beam scans the entire area of the corresponding hologram area 17, the entire area of the predetermined range 10 is illuminated. The green and blue laser lights illuminate areas other than the central portion 10 a in the predetermined range 10 in order to scan the areas other than the white areas in the corresponding hologram area 17. As a result, the central portion 10a in the predetermined range 10 is illuminated in red, and the predetermined range 10 other than the central portion 10a is illuminated in white by mixing red, green and blue illumination light.

  On the other hand, in FIG. 6, in any of the three hologram regions 17, the laser light scans the region other than the region corresponding to the central portion 10 a within the predetermined range 10. For this reason, the central portion 10a in the predetermined range 10 is a non-illuminated region that is not illuminated with any color.

  Since the light emission timing control unit 5 controls the light emission timings of the three laser lights individually, the light emission timing control unit 5 arbitrarily adjusts the light emission timings of the three laser lights, so that an arbitrary place within the predetermined range 10 can be displayed in any color. Can be illuminated. If the illumination mode inside the predetermined range 10 is arbitrarily adjusted, an arbitrary partial area within the actual illumination range illuminated with the laser light that has passed through the predetermined range 10 is selected according to the illumination mode. Illumination is possible.

  7A to 7C illustrate that the illumination device 1 illuminates the moving object 22 that is the illumination target detected within the predetermined range 10 while tracking the illumination mode in other areas. It is a figure which shows the example different from an aspect, and FIG. 8 (A)-(C) is the figure which showed the example of FIG. 7 from another angle.

  7 and 8, reference numeral 22 denotes a moving object that is an illumination target. The moving object 22 is detected by the illumination target detection unit 21. As shown in FIGS. 7 and 8, the illumination mode for the moving object 22 is different from the illumination mode for other regions within the predetermined range 10. In these drawings, the illumination mode of the partial area 19 including the moving object 22 is illustrated by a shadow line, but this shadow line indicates that the illumination color is different from the other areas. And as shown to (A)-(C) of each of FIG.7 and FIG.8, according to the position of the moving object 22, the area | region illuminated with a different illumination aspect also changes.

  In this example, the hologram recording medium 16 has three hologram regions 17 corresponding to three laser beams that emit light in red, green, and blue, and the partial region 19 including the moving object 22 is illuminated with red illumination light. The other partial area 19 is illuminated with illumination light of a color different from red. In this case, in the hologram area 17 for red, the element hologram area 18 corresponding to at least the partial area 19 including the moving object 22 is scanned with the corresponding laser beam, and in the hologram area 17 for green and blue, at least the moving object Except for the element hologram area 18 corresponding to the partial area 19 including 22, scanning is performed with the corresponding laser light. As a result, the partial area 19 including the moving object 22 in the predetermined range 10 is illuminated in red, and the other predetermined ranges 10 are illuminated in other colors.

  7 and 8 exemplify the case where the illumination target detected by the illumination target detection unit 21 is the moving object 22, the illumination target detected by the illumination target detection unit 21 may be a stationary object.

  FIGS. 9A to 9C show that the illumination target in the predetermined range 10 illuminated by the illumination device 1 in FIG. It is a figure which shows the example which formed the geometric shape by changing the illumination aspect of illumination object with another area | region, when it is the areas 23-25 for forming the geometric shapes 33-35.

  In the example of FIG. 9, each of the areas 23 to 25 to be illuminated to form the geometric shapes 33 to 35 is configured by a set of a plurality of lines indicated by bold lines in the drawing. These areas 23 to 25 are detected (recognized) by the illumination target detection unit 21. In this example, the geometric shape 33 shown in FIG. 9A is a futsal court line, the geometric shape 34 shown in FIG. 9B is a tennis court line, and the geometric shape shown in FIG. 9C. Reference numeral 35 denotes a volleyball court line.

  In this example, the hologram recording medium 16 has three hologram regions 17 corresponding to three laser beams that emit light in red, green, or blue, and for the partial region 19 corresponding to the regions 23 to 25, White illumination light is illuminated. On the other hand, illumination light of a color different from white is illuminated in areas other than the areas 23 to 25. In this case, whether the element hologram area 18 corresponding to the partial area 19 including the areas 23 to 25 is scanned with all laser beams, and the other partial areas 19 are scanned with only one or two laser beams. The laser beam is not scanned. As a result, the partial area 19 corresponding to the areas 23 to 25 in the predetermined range 10 is illuminated with white light to form a geometric shape. According to such illumination control, a necessary line (geometric shape) can be arbitrarily switched according to the competition to be performed. Needless to say, the geometric shape formed in the predetermined range 10 described herein may be another shape.

  By the way, the hologram recording medium 16 as the optical element 3 used in the above-described embodiment can be manufactured using, for example, scattered light from an actual scattering plate as object light. More specifically, when the hologram photosensitive material that is the base of the hologram recording medium 16 is irradiated with reference light and object light made of coherent light having coherence with each other, interference fringes due to interference of these lights are generated on the hologram photosensitive material. Thus, the hologram recording medium 16 is manufactured. As reference light, laser light which is coherent light is used, and as object light, for example, scattered light from an isotropic scattering plate available at low cost is used.

  By irradiating the hologram recording medium 16 with a laser beam from the convergence position of the reference light composed of the convergent light beam used when producing the hologram recording medium 16, the object light used when producing the hologram recording medium 16 is irradiated. A reproduced image of the scattering plate is generated at the position of the original scattering plate. If the scattering plate that is the source of the object light used for producing the hologram recording medium 16 has a uniform surface scattering, the reproduced image of the scattering plate obtained by the hologram recording medium 16 also has a uniform surface illumination. The region where the reproduced image of the scattering plate is generated is the predetermined range 10 or the illuminated region of the near field for illuminating the predetermined range 10.

  In the present embodiment, the optical element 3 is used to perform illumination control such that a part of the illumination color within the predetermined range 10 is changed or only a part of the predetermined range 10 is not illuminated. In order to perform such illumination control using the hologram recording medium 16, the interference fringe pattern formed in each element hologram region 18 becomes complicated. Such a complex interference fringe pattern is not formed by using the actual object light and reference light, but by the planned wavelength and incident direction of the reproduction illumination light, and the shape and position of the image to be reproduced. It is possible to design using a computer based on this. The hologram recording medium 16 obtained in this way is also called a computer generated hologram (CGH). A Fourier transform hologram having the same diffusion angle characteristic at each point on each element hologram region 18 may be formed by computer synthesis. Further, in the case of expressing the diffusion angle distribution in the illuminated area of the near field for illuminating the predetermined area 10, an optical member such as a lens is provided on the rear side of the optical axis of the illuminated area of the near field, 10 may be set. In addition, since a Fourier transform hologram can express a diffusion pattern as a diffusion angle distribution in an angle space, it is possible to design a hologram that is particularly useful when controlling the illumination state of far-field illumination.

  One advantage of providing the hologram recording medium 16 as the optical element 3 is that the light energy density of the laser light can be reduced by diffusion. Another advantage is that the hologram recording medium 16 has directivity. Since it can be used as a surface light source, the luminance on the light source surface for achieving the same illuminance distribution can be reduced as compared with a conventional lamp light source (point light source). Thereby, it is possible to contribute to the improvement of the safety of the laser beam, and even if the human eyes directly view the light irradiated to the predetermined range 10, there is a possibility that the human eyes are adversely affected as compared with the case where the single point light source is directly viewed. Less.

  In the example shown in FIGS. 2 to 6, the hologram regions 17 for red, green, and blue are adjacently disposed along the incident surface of each hologram region 17 as shown in FIG. 10. In FIG. 10, the hologram area for red is indicated by reference numeral 17r, the hologram area for green is indicated by reference numeral 17g, and the hologram area for blue is indicated by reference numeral 17b.

  As described above, in addition to the three hologram regions 17 arranged adjacent to each other along the incident surface, a hologram recording medium 16 in which the hologram regions 17 are arranged in the stacking direction as shown in FIG. 11 may be used. In this case, the interference fringe pattern of each hologram region 17 is formed in the layer of each hologram region 17. The visible light transmittance of each hologram region 17 is set as much as possible so that the laser beam reaches as far as possible from the surface of the hologram recording medium 16 on which the laser beam from the optical scanning member 6 is incident to the hologram region 17 at the back. It is desirable to raise it. In addition, if an interference fringe pattern is formed at a position that overlaps in the stacking direction, it becomes difficult for laser light to reach the layer farther from the surface. Therefore, as shown in FIG. It is desirable to form a stripe pattern.

  Although FIG. 2 shows an example in which the laser light from the optical scanning member 6 is transmitted through the optical element 3 and diffuses, the optical element 3 may be one that diffuses and reflects the laser light. For example, when the hologram recording medium 16 is used as the optical element 3, the hologram recording medium 16 may be a reflection type or a transmission type. In general, the reflection type hologram recording medium 16 (hereinafter referred to as reflection type holo) has higher wavelength selectivity than the transmission type hologram recording medium 16 (hereinafter referred to as transmission type holo). That is, the reflection type holo can diffract coherent light having a desired wavelength only by a desired layer even if interference fringes corresponding to different wavelengths are laminated. The reflection type holo is also excellent in that it is easy to remove the influence of zero-order light.

  In addition, as a specific form of the hologram recording medium 16, a volume hologram recording medium 16 using a photopolymer may be used, or a volume hologram recording medium 16 of a type for recording using a photosensitive medium containing a silver salt material. Alternatively, a relief type (emboss type) hologram recording medium 16 may be used.

  The specific form of the optical element 3 is not limited to the hologram recording medium 16 and may be various diffusion members that can be finely divided into a plurality of element diffusion regions 15. For example, the optical element 3 may be configured using a lens array group in which each element diffusion region 15 is a single lens array. In this case, a lens array is provided for each element diffusion region 15, and the shape of each lens array is designed so that each lens array illuminates a partial region 19 within the predetermined range 10. The positions of the partial areas 19 are at least partially different. As a result, as in the case where the optical element 3 is configured using the hologram recording medium 16, it is possible to change the illumination color of only a part within the predetermined range 10 or not to illuminate only a part.

  5 to 9 exemplify various methods for changing a part of the illumination mode within the predetermined range 10, but other methods may be considered. For example, when the laser light source 4 has a plurality of light source units 7 that emit light in the same emission wavelength region, the light emission of some of the light source units 7 is stopped, and a part of illumination within the predetermined range 10 The intensity may be lower than the surrounding illumination intensity. Conversely, a part of the illumination intensity within the predetermined range 10 may be made higher than the surrounding illumination intensity. Further, a part of the predetermined range 10 may be blinked. Alternatively, some colors in the predetermined range 10 may be changed continuously or intermittently.

  Thus, in this embodiment, the optical element 3 having a plurality of diffusion regions 14 associated with a plurality of laser beams having different emission wavelength ranges is provided, and each diffusion region 14 has a plurality of element diffusion regions 15. Since each element diffusion region 15 illuminates the partial region 19 within the predetermined range 10, the light emission timing control unit 5 controls whether or not each element diffusion region 15 is irradiated with the laser light. The illumination mode of an arbitrary area within 10 can be made different from the illumination mode of other areas within the predetermined range 10. Thereby, the illuminating device 10 can change arbitrarily the illumination aspect of the arbitrary area | regions within the predetermined range 10 to illuminate, without making the structure of an optical system complicated.

  The optical scanning member 6 scans the laser light in each element diffusion region 15, and the laser light incident on each point in each element diffusion region 15 illuminates the entire area of the corresponding partial region 19. The incident angle of the laser beam in each partial region 19 within the range 10 changes with time, and speckles within the predetermined range 10 are less noticeable.

  In particular, in the present embodiment, since the light emission timing control unit 5 controls the light emission timings of the plurality of light source units 7 in accordance with the illumination target detected by the illumination target detection unit 21, the illumination mode for the illumination target is set to a predetermined range. It can be changed from other areas in 10. In this case, it is possible to continuously detect a moving illumination target within the predetermined range 10 and change the illumination mode to another region within the predetermined range 10 while performing illumination so as to track the illumination target. Thereby, effective illumination can be performed in the predetermined range 10. In particular, such an illuminating device 1 can provide an attractive performance for a spectator, a spectator, or a viewer by illuminating a competition area of a stadium, a stage such as a concert hall, and the like.

  The aspect of the present invention is not limited to the above-described individual embodiments, and includes various modifications that can be conceived by those skilled in the art. The effects of the present invention are not limited to the above-described contents. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Irradiating device 3 Optical element 3a Incident surface 4 Laser light source 5 Light emission timing control part 6 Optical scanning member 7,7r, 7g, 7b Light source part 10 Predetermined range 10a Center part 11,12 Rotating shaft 13 Reflecting device 13a Reflecting surface 14 Diffusion area 15 Element diffusion area 16 Hologram recording medium 17 Hologram area 17a Incident surface 18 Element hologram area 19 Partial area 21 Illumination target detection unit 22 Moving object 23, 24, 25 Area 33, 34, 35 Geometric shape

Claims (6)

A coherent light source that emits a plurality of coherent lights having different emission wavelength ranges,
A light emission timing control unit that individually controls light emission timings of the plurality of coherent lights;
An optical element for illuminating a predetermined range by diffusing the plurality of coherent lights whose emission timings are controlled by the emission timing control unit;
An optical scanning member that scans the optical element with the plurality of coherent lights from the coherent light source;
An illumination object detection unit for detecting an illumination object existing in a partial area within the predetermined range;
With
The optical element is provided corresponding to each of the plurality of coherent lights, and has a plurality of diffusion regions into which the corresponding coherent lights are incident,
Each of the plurality of diffusion regions can illuminate the predetermined range by diffusion of incident coherent light,
Each of the plurality of diffusion regions has a plurality of element diffusion regions,
Each of the plurality of element diffusion regions illuminates a partial region within the predetermined range by diffusion of incident coherent light,
At least some of the partial areas illuminated by each of the plurality of element diffusion areas are different from each other;
The light emission timing control unit is configured to illuminate the illumination target detected by the illumination target detection unit in a first illumination mode, and for other regions within the predetermined range, the first illumination mode. An illumination device that individually controls the light emission timings of the plurality of coherent lights so that illumination is performed in a second illumination mode different from the illumination mode of (1) or not. The optical scanning member periodically scans the plurality of coherent lights from the coherent light source on an incident surface of the optical element,
The illumination device according to claim 1, wherein the light emission timing control unit individually controls light emission timings of the plurality of coherent lights in synchronization with scanning timings of the plurality of coherent lights by the optical scanning member.   The lighting device according to claim 1, wherein the illumination target is a stationary object or a moving object that exists within the predetermined range.   The illumination object is an area defined at a predetermined position within the predetermined range, and is an area for forming a geometric shape within the predetermined range by being illuminated in an illumination manner different from other areas. The lighting device according to claim 1 or 2. The optical element is a hologram recording medium;
5. The illumination device according to claim 1, wherein each of the plurality of element diffusion areas is an element hologram area in which different interference fringe patterns are formed. The optical element is a lens array group having a plurality of lens arrays,
5. The illumination device according to claim 1, wherein each of the plurality of element diffusion regions includes the lens array.

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