JP2016088393A - Movable body and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable body having a lighting device that can keep appropriately illuminating an approaching object to be illuminated while suppressing the generation of speckle, and the lighting device.SOLUTION: A lighting device comprises: a coherent light source for emitting coherent light; an emission timing control part for controlling emission timing; an optical element for diffusing the coherent light; and a light scanning member for scanning the coherent light on the optical element. The optical element has a plurality of element diffusion regions. Each of the plurality of element diffusion regions illuminates a corresponding partial region within a predetermined angle range by the diffusion of the coherent light. At least parts of the partial region illuminated respectively by the plurality of element diffusion regions are different from each other. The light emission timing control part controls emission timing so as to illuminate a stationary object to be illuminated within the predetermined angle range and to expand an angle range of the illuminated region wider as the lighting device approaches closer to the object to be illuminated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moving body provided with an illumination device that illuminates a predetermined range using coherent light, and an illumination device.

  Patent Document 1 stores a light source that emits coherent light, and a hologram pattern that is calculated so that diffracted light reproduced by irradiation with coherent light forms a light distribution pattern for a vehicle lamp having a predetermined luminous intensity distribution. A vehicular lamp including the hologram element is disclosed.

JP 2012-146621 A

  Laser light sources that can emit coherent light can emit powerful light energy in a small issuance area compared to conventional lamp light sources and LEDs, so that light distribution can be finely controlled and light can be transmitted far away There is an advantage that you can. On the other hand, when coherent light hits a scattering reflection surface such as a road surface, there is a problem that speckles are generated due to interference between the coherent light reflected by each part of the scattering reflection surface. When coherent light is used as a vehicular lamp as in Patent Document 1, speckles are generated in the driver's field of view, which may reduce the driver's attention. In addition, when the optical path of the laser light is mixed in a complicated manner by a diffuser plate or a light homogenizing optical system in the lighting device, speckles generated from the lighting device also become a problem. This is a speckle component that can be measured as an illuminance distribution on the irradiated surface, and is distinguished from the speckle component generated by scattering on the scattering reflection surface.

  Moreover, when illuminating an object to be illuminated that is located in front of the traveling direction of the vehicle, the angle range of the object to be illuminated in an angle space centered on the vehicle is increased with the approach to the object to be illuminated. When the coherent light emitted from the light source is diffused to one side over the entire range of the predetermined angle range as in Patent Document 1, the illuminated object protrudes from the illuminated area as it approaches the illuminated object. The entire illuminated object may not be visible.

  The present invention has been devised to pay attention to the above problems and to effectively solve them. An object of the present invention is to provide a moving body and an illuminating device including an illuminating device that can appropriately illuminate an approaching object to be illuminated while suppressing generation of speckle.

The moving body according to the present invention is:
A mobile body,
An illumination device provided in the mobile body;
With
The lighting device includes:
A coherent light source that emits coherent light;
A light emission timing controller for controlling the light emission timing of the coherent light;
An optical element that diffuses the coherent light whose light emission timing is controlled by the light emission timing control unit;
An optical scanning member for scanning the coherent light from the coherent light source on the optical element;
Have
The optical element has a plurality of element diffusion regions, and each of the plurality of element diffusion regions illuminates a corresponding partial region within a predetermined angle range by diffusing incident coherent light, and At least some of the partial areas illuminated by each of the element diffusion areas are different from each other;
The light emission timing control unit illuminates a stationary object within the predetermined angle range, and expands the angle range of the illuminated region as the object is approached. The light emission timing is controlled.
In the moving body according to the present invention, the light emission timing control unit is configured to move the center of the angle range of the illuminated area upward and / or laterally as the illuminated object approaches. The emission timing of coherent light may be controlled.
The moving body according to the present invention further includes a speed sensor that measures a moving speed of the moving body, and the light emission timing control unit expands an angle range of the illuminated area according to a measurement result of the speed sensor. As described above, the emission timing of the coherent light may be controlled.
In the moving body according to the present invention, an imaging device that captures an image within the predetermined angle range, and an image processing unit that performs image processing on an imaging result of the imaging device and recognizes a stationary object within the predetermined angle range The light emission timing control unit may control the light emission timing of the coherent light so as to illuminate the object to be illuminated recognized by the image processing unit.
In the moving body according to the present invention, 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.
In the movable body according to the present invention, 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.
The lighting device according to the present invention comprises:
A coherent light source that emits coherent light;
A light emission timing controller for controlling the light emission timing of the coherent light;
An optical element that diffuses the coherent light whose light emission timing is controlled by the light emission timing control unit;
An optical scanning member for scanning the coherent light from the coherent light source on the optical element;
Have
The optical element has a plurality of element diffusion regions, and each of the plurality of element diffusion regions illuminates a corresponding partial region within a predetermined angle range by diffusing incident coherent light, and At least some of the partial areas illuminated by each of the element diffusion areas are different from each other;
The light emission timing control unit illuminates a stationary object within the predetermined angle range, and expands the angle range of the illuminated region as the object is approached. The light emission timing is controlled.

  ADVANTAGE OF THE INVENTION According to this invention, it can continue illuminating the to-be-illuminated object appropriately, suppressing generation | occurrence | production of a speckle.

FIG. 1 is a diagram showing a schematic configuration of a moving body according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating a state in which coherent light is scanned on the optical element by the optical scanning member. FIG. 3 is a diagram illustrating a state in which coherent light diffused by the optical element is incident in a predetermined angle range. FIG. 4 is a diagram illustrating an example in which an arbitrary region within a predetermined angle range is illuminated by controlling the light emission timing. FIG. 5 is a diagram showing a schematic configuration of a moving body according to the second embodiment of the present invention. FIG. 6 is a diagram showing a schematic configuration of a moving body according to the third embodiment of the present invention. FIGS. 7A to 7C are views of the moving body and the object to be illuminated as viewed from above. FIGS. 8A to 8C are diagrams corresponding to FIGS. 7A to 7C, and are views showing the field of view of the driver who drives the moving body.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that, in the drawings attached to the present specification, for the sake of easy understanding of the drawings, the scale and the vertical / horizontal dimension ratio are appropriately changed and exaggerated from those of the actual ones.

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

  FIG. 1 is a diagram showing a schematic configuration of a moving body 9 according to the first embodiment of the present invention. FIGS. 7A to 7C are views of the moving body 9 and the illumination object 31 of FIG. 1 viewed from above. FIGS. 8A to 8C are diagrams corresponding to FIGS. 7A to 7C, and are views showing the field of view of the driver who drives the moving body 9.

  In this specification, the moving body 9 means a moving device, particularly a vehicle, that can move relative to the object 31 in a three-dimensional space. In the example shown in FIGS. 7A to 7C, the moving body 9 is a vehicle that travels on the ground, and more specifically, is an automobile, but is not limited thereto, and is not limited to this. It may be a submarine that moves in the air, an airplane that moves in the air, or the like.

  As shown in FIG. 1 and FIGS. 7A to 7C, a moving body 9 according to the present embodiment includes a moving body main body 2 and an illumination device 1 provided on the moving body main body 2. .

  The illuminating device 1 of this Embodiment is an auxiliary lamp for tracking and illuminating the to-be-illuminated object 31 located ahead of the advancing direction. The lighting device 1 may be provided side by side in a unit common to the headlamp for illuminating a predetermined range defined by traffic regulations or the like, or provided independently in a unit separate from the headlamp. May be.

  As shown in FIG. 1, the lighting device 1 has a light emission timing controlled by a coherent light source 4 that emits coherent light L, a light emission timing control unit 5 that controls the light emission timing of the coherent light L, and a light emission timing control unit 5. The optical element 3 for diffusing the coherent light L and the optical scanning member 6 for scanning the coherent light L from the coherent light source 4 on the optical element 3 are provided.

  Among these, as the coherent light source 4, for example, a semiconductor laser light source can be used. In order to increase the emission intensity, a plurality of coherent light sources 4 may be provided.

  The light emission timing control unit 5 controls the light emission timing at which the coherent light L is emitted from the coherent light source 4.

  Specifically, for example, the light emission timing control unit 5 controls whether or not to emit the coherent light L from the coherent light source 4, that is, on / off of light emission. Alternatively, the light emission timing control unit 5 may switch whether or not to guide the coherent light L emitted from the coherent light source 4 to the incident surface of the optical scanning member 6. In the latter case, an optical shutter unit (not shown) may be provided between the coherent light source 4 and the optical scanning member 6, and the passage / blocking of the coherent light L may be switched by this optical shutter unit.

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

  For example, as shown in FIG. 2, the optical scanning member 6 includes a reflection device 13 that can rotate around two rotation axes 11 and 12 that extend in directions intersecting each other. The coherent light L from the coherent light source 4 incident on the reflecting surface 13s of the reflecting device 13 is reflected at an angle corresponding to the inclination angle of the reflecting surface 13s and travels in the direction of the incident surface 3s of the optical element 3. By rotating the reflection device 13 around the two rotation axes 11 and 12, the coherent light L scans the incident surface 3s of the optical element 3 two-dimensionally. The reflection device 13 repeats, for example, an operation of rotating around the two rotation axes 11 and 12 at a constant period. Therefore, the coherent light L is repeatedly two-dimensionally scanned on the incident surface 3s of the optical element 3 in synchronization with this period. To do.

  The optical element 3 has an incident surface 3s on which the coherent light L is incident, and diffuses the coherent light L incident on the incident surface 3s to illuminate a predetermined angle range. More specifically, the coherent light L diffused by the optical element 3 passes through the illuminated area 10a (see FIG. 4) in the virtual illumination area 10 corresponding to a predetermined angle range, and then in the actual illumination range. Illuminate a certain range.

  Here, the illuminated area 10 a is a near-field illuminated area illuminated by the optical element 3. The far field illumination range is often expressed as a diffuse angle distribution in the angle space rather than the actual size of the illuminated area. In this specification, the term “illuminated region” includes a diffusion angle range in an angle space in addition to an actual irradiated area (illumination range). Therefore, the predetermined range illuminated by the illuminating device 1 of FIG. 1 can be an area far wider than the illuminated area 10a of the near field shown in FIG.

  FIG. 3 is a diagram illustrating a state in which the coherent light L diffused by the optical element 3 is incident on the virtual illumination region 10. The optical element 3 diffuses the incident coherent light L and illuminates the entire virtual illumination region 10 as a whole.

  As shown in FIG. 3, the optical element 3 has a plurality of element diffusion regions 15. Each element diffusion region 15 diffuses the incident coherent light L and illuminates a corresponding partial region 19 in the virtual illumination region 10. At least a part of the partial region 19 is different for each element diffusion region 15.

  Specifically, for example, the optical element 3 can be configured using a hologram recording medium 16. The coherent light L incident and diffused on the hologram recording medium 16 illuminates the virtual illumination area 10.

  As shown in FIG. 3, the hologram recording medium 16 has a plurality of element hologram regions 18. Each of the plurality of element hologram regions 18 illuminates the corresponding partial region 19 in the virtual illumination region 10 by diffusing the incident coherent light L. 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 in each element hologram region 18. Therefore, the coherent light L incident on each element hologram region 18 is diffracted by the interference fringe pattern, and illuminates the corresponding partial region 19 in the virtual illumination region 10. By adjusting the interference fringe pattern in various ways, the traveling direction of the coherent light L diffracted, that is, diffused by each element hologram region 18 can be changed.

  Thus, the coherent light L incident on each point in each element hologram region 18 illuminates the corresponding partial region 19 in the virtual illumination region 10. Further, the optical scanning member 6 scans each element hologram region 18 with the coherent light L, thereby changing the incident position and the incident angle of the coherent light L incident on each element hologram region 18 over time. The coherent light L incident in one element hologram region 18 illuminates the common partial region 19 regardless of the position in the element hologram region 18. This means that the incident angle of the coherent light L incident on each point of the partial region 19 changes with time. This 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 L 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. Thereby, in the virtual illumination area | region 10, a speckle becomes inconspicuous. Further, since the coherent light L from the optical scanning member 6 sequentially scans each element hologram region 18 of the hologram recording medium 16, the coherent light L diffracted at each point in each element hologram region 18 has a different wavefront. The diffracted coherent light L is superimposed on the virtual illumination region 10 independently, so that a uniform illuminance distribution with inconspicuous speckles is obtained in the virtual illumination region 10.

  FIG. 3 shows an example in which each element hologram area 18 illuminates a different partial area 19 in the virtual illumination area 10, but a part of the partial area 19 may overlap the adjacent partial area 19. . Further, the size of the partial region 19 may be different for each element hologram region 18. Furthermore, the corresponding partial areas 19 do not have to be arranged in the virtual illumination area 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 recording medium 16 and the arrangement order of the corresponding partial areas 19 in the virtual illumination area 10 do not necessarily need to match.

  Next, the structure of the hologram recording medium 16 will be described in detail.

  The hologram recording medium 16 can be produced using, for example, scattered light from an actual scattering plate as object light. More specifically, when the hologram photosensitive material which 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, an interference fringe pattern due to interference of these lights is generated in the hologram photosensitive material. The hologram recording medium 16 is formed by forming the material. As reference light, laser light which is coherent light is used, and as object light, for example, scattered light of an isotropic scattering plate that can be incident at low cost is used.

  By irradiating the hologram recording medium 16 with coherent light from the focal position of the reference light used when producing the hologram recording medium 16, the scattering that is the source of the object light used when producing the hologram recording medium 16 A reproduced image of the scattering plate is generated at the position of the 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. A region where a reproduced image of the scattering plate is generated is a virtual illumination region 10.

  In the present embodiment, the optical element 3 is used to perform illumination control so that only a part of the virtual illumination area is 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 based on the expected wavelength and incident direction of the reproduction illumination light, and the shape and position of the image to be reproduced, instead of using the actual object light and the reference light. It is possible to design using a computer. 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. Furthermore, an optical member such as a lens may be provided on the rear side of the optical axis of the virtual illumination area 10 to set the size and position of the actual illumination range.

  One advantage of providing the hologram recording medium 16 as the optical element 3 is that the light energy density of the coherent light L can be reduced by diffusion. Another advantage is that the hologram recording medium 16 can be used as a directional surface light source, so that it is necessary to achieve the same illuminance distribution as compared with a conventional lamp light source (point light source). The brightness on the light source surface can be reduced. Thereby, it can contribute to the safety improvement of coherent light, and even if the coherent light L which passed through the to-be-illuminated area | region 10a is directly seen with human eyes, compared with the case where a single point light source is directly seen, it will have a bad influence on human eyes. The fear is reduced.

  Although FIG. 1 shows an example in which the coherent light L from the optical scanning member 6 is transmitted through the optical element 3 and diffuses, the optical element 3 may be one that diffusely reflects the coherent light L. 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 fringe patterns 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. On the other hand, the transmission type holo has a wide diffractable spectrum and a wide tolerance of the coherent light source 4. However, when interference fringe patterns corresponding to different wavelengths are laminated, coherent light having a desired wavelength can be obtained in layers other than the desired layer. Will be diffracted. Therefore, in general, it is difficult to make a transmission type holo a laminated structure.

  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. But you can. Alternatively, a relief (embossed) hologram recording medium 16 may be used.

  In the present embodiment, the optical scanning member 6 periodically scans the coherent light L from the coherent light source 4 on the incident surface 3s of the optical element 3, and the light emission timing control unit 5 The emission timing of the coherent light L is controlled in synchronization with the scanning timing of the coherent light L by the scanning member 6.

  By controlling whether or not to emit the coherent light L to each element hologram area 18 by the light emission timing control section 5, as shown in FIG. 4, an arbitrary area 10a in the virtual illumination area 10 is selectively illuminated. In addition, the size and / or center position of the angle range of the illuminated region 10a can be easily changed. At this time, the partial areas 19 of the selected area are sequentially illuminated by the coherent light L at a speed as if they were illuminated simultaneously by the human eye.

  In the present embodiment, the light emission timing control unit 5 illuminates a stationary object 31 within a predetermined angle range corresponding to the virtual illumination region 10, and the object is illuminated as the object 31 is approached. The light emission timing of the coherent light L is controlled so that the angle range of the region 10a is expanded.

  Further, the light emission timing control unit 5 emits the coherent light L so that the center of the angle range of the illuminated area 10a moves upward and / or laterally as the object 31 is approached. Is configured to control.

  Next, with reference to FIGS. 7A to 7C and FIGS. 8A to 8C, the operation of the present embodiment having such a configuration will be described.

  As shown in FIGS. 7A and 8A, an object to be illuminated 31 (for example, a traffic sign) positioned in front of the moving body 9 in the traveling direction is illuminated in an angular space centered on the moving body 9. When included in a predetermined angle range that can be illuminated by the apparatus 1, the light emission timing control unit 5 controls the light emission timing of the coherent light L so as to illuminate the stationary object 31 within the predetermined angle range. To do.

  Specifically, for example, the light emission timing control unit 5 identifies a partial region 19 that at least partially overlaps the object to be illuminated 31 among the plurality of partial regions 19 in the virtual illumination region 10 corresponding to a predetermined angle range. Then, the element hologram area 18 corresponding to the specified partial area 19 is irradiated with the coherent light L, but the emission timing of the coherent light L is set so that the other element hologram area 18 is not irradiated with the coherent light L. Control. Thereby, as shown to Fig.8 (a), the to-be-illuminated object 31 in the virtual illumination area | region 10 is illuminated appropriately.

  Next, as shown in FIG. 7B and FIG. 8B, when the moving body 9 approaches the illuminated object 31, the light emission timing control unit 5 moves along with the approach to the illuminated object 31. Thus, the emission timing of the coherent light L is controlled so that the angle range of the illuminated region 10a is expanded and the center of the angle range of the illuminated region 10a is moved upward and / or laterally. .

  Specifically, for example, the light emission timing control unit 5 includes a partial area 19 corresponding to the illuminated area 10a in the virtual illumination area 10 and a partial area 19 adjacent to the illuminated area 10a in the upward and / or lateral direction. The element hologram area 18 corresponding to the specified partial area 19 is irradiated with the coherent light L, but the other element hologram area 18 is not irradiated with the coherent light L. Control timing. As a result, as shown in FIG. 8B, the angle range of the illuminated area 10a is expanded (in the illustrated example, it is expanded from 4 frames to 6 frames), and the angle of the illuminated area 10a is increased. The center of the range is moved upward and / or laterally (to the left in the illustrated example). As a result, as shown in FIG. 8 (b), the object to be illuminated 31 can be illuminated following the movement of the moving body 9.

  Next, as shown in FIG. 7C and FIG. 8C, when the moving body 9 further approaches the illuminated object 31, the light emission timing control unit 5 approaches the illuminated object 31. Accordingly, the emission timing of the coherent light L is controlled so that the angle range of the illuminated region 10a is expanded and the center of the angle range of the illuminated region 10a is moved upward and / or laterally. To do.

  Specifically, for example, the light emission timing control unit 5 includes a partial area 19 corresponding to the illuminated area 10a in the virtual illumination area 10 and a partial area 19 adjacent to the illuminated area 10a in the upward and / or lateral direction. The element hologram area 18 corresponding to the specified partial area 19 is irradiated with the coherent light L, but the other element hologram area 18 is not irradiated with the coherent light L. Control timing. As a result, as shown in FIG. 8C, the angle range of the illuminated area 10a is expanded (in the illustrated example, it is expanded from 6 frames to 12 frames), and the angle of the illuminated area 10a is increased. The center of the range is moved upward and / or laterally (upper left in the illustrated example). As a result, as shown in FIG. 8 (c), the object to be illuminated 31 can be illuminated following the movement of the moving body 9.

  According to the present embodiment as described above, the optical element 3 has a plurality of element diffusion regions 15, and each element diffusion region 15 illuminates a corresponding partial region 19 within a predetermined angle range. By controlling whether or not to irradiate the coherent light L to the diffusion region 15 by the light emission timing control unit 5, it is possible to selectively illuminate an arbitrary region within a predetermined angle range, and the illumination region 10 a The size of the angle range and / or the center position can be easily changed. Although the angle range of the object to be illuminated 31 in the angle space centered on the moving body 9 increases as the object 31 is approached, the light emission timing control unit 5 controls the emission timing of the coherent light L to control the object to be illuminated. As the angle range of the illuminated area 10a is enlarged with the approach to the illuminated object 31, it is possible to suppress the approaching illuminated object 31 from protruding from the illuminated area 10a. Thereby, the driver | operator who drives the mobile body 9 can continue visually recognizing the whole to-be-illuminated object 31. FIG.

  Further, according to the present embodiment, the optical scanning member 6 scans the coherent light L in each element diffusion region 15, and the coherent light L incident on each point in each element diffusion region 15 corresponds to a corresponding portion. Since the entire area 19 is illuminated, the incident angle of the coherent light L in each of the partial areas 19 in the illuminated area 10a changes with time, and speckles in the illuminated area 10a are less noticeable. it can.

  By the way, in the mobile body 9 that travels on the ground such as a vehicle or the mobile body 9 that travels on the sea such as a ship, an illuminated object 31 such as a traffic sign is often provided at a higher position than the mobile body 9. . In this case, since the center of the angular range of the object 31 positioned forward in the traveling direction moves upward and / or laterally as the object 31 approaches, the object 31 is moved. It becomes easy to protrude from the illuminated area 10a.

  However, according to the present embodiment, the center of the angle range of the illuminated region 10a is set upward as the light source timing control unit 5 controls the emission timing of the coherent light L as the object 31 is approached. Since the object to be illuminated 31 is moved in the lateral direction, it is possible to more effectively suppress the approaching illuminated object 31 from protruding from the illuminated area 10a.

  Various changes can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as the above embodiment. The duplicated explanation is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

  FIG. 5 is a diagram showing a schematic configuration of the moving body 9 according to the second embodiment of the present invention.

  As shown in FIG. 5, the moving body 9 according to the second embodiment further includes a speed sensor 21 that measures the moving speed of the moving body 2. The light emission timing control unit 5 controls the light emission timing of the coherent light L so that the angle range of the illuminated region 10 a is expanded according to the measurement result of the speed sensor 21.

  Specifically, for example, when the moving body 9 is accelerating toward the illuminated object 31, the light emission timing control unit 5 is compared with the case where the moving body 9 approaches the illuminated object 31 at a constant speed. Thus, the emission timing of the coherent light L is controlled so that the expansion speed (that is, the expansion amount per unit time) of the angle range of the illuminated region 10a is increased. Thereby, it can suppress effectively that the to-be-illuminated object 31 protrudes from the to-be-illuminated area | region 10a.

  On the other hand, when the moving body 9 is decelerating toward the object to be illuminated 31, the light emission timing control unit 5 is compared with the case where the moving body 9 approaches the object to be illuminated 31 at a constant speed. The light emission timing of the coherent light L is controlled so that the expansion speed of the angle range of 10a is reduced. Thereby, it can suppress that the to-be-illuminated area | region 10a is expanded excessively and the driver | operator of the oncoming vehicle or the vehicle ahead is dazzled by the coherent light L which remove | deviated from the to-be-illuminated object 31.

  FIG. 6 is a diagram showing a schematic configuration of the moving body 9 according to the third embodiment of the present invention.

  As shown in FIG. 6, the moving body 9 according to the third embodiment performs image processing on an imaging device 22 that captures an image within a predetermined angle range, and an imaging result of the imaging device 22, so And an image processing unit 23 for recognizing the stationary object 31.

  As the imaging device 22, for example, a commercially available imaging device equipped with a CCD (or a CMOS sensor array or the like) that converts light emitted or reflected from an object existing within a predetermined angle range into an electrical signal is used. obtain. The image processing unit 23 performs image processing on the imaging result of the imaging device 22 to determine whether or not the object to be illuminated 31 exists within a predetermined angular range. The partial area 19 that overlaps at least a part of the illumination object 31 in the virtual illumination area 10 corresponding to is specified.

  The light emission timing control unit 5 controls the light emission timing of the coherent light L so as to illuminate the illuminated object 31 recognized by the image processing unit 23.

  Specifically, for example, the light emission timing control unit 5 irradiates the element hologram area 18 corresponding to the partial area 19 specified by the image processing unit 23 with the coherent light L, but the other element hologram area 18 is irradiated with the coherent light L. Controls the emission timing of the coherent light L so that the coherent light L is not irradiated. Thereby, the stationary to-be-illuminated object 31 within a predetermined angle range can be illuminated appropriately.

  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 such that each lens array illuminates a corresponding partial region 19 within a predetermined angular range. Each partial area 19 is at least partially different. Thereby, similarly to the case where the optical element 3 is configured using the hologram recording medium 16, by arbitrarily adjusting the light emission timing of the coherent light L, it is possible to illuminate an arbitrary place within a predetermined angle range. .

  In the embodiment described above, coherent light having a single emission wavelength range is used as the coherent light L. However, the present invention is not limited to this, and the coherent light source 4 emits a plurality of coherent lights having different emission wavelength ranges. In addition to providing a laser light source, the optical element 3 is provided with a plurality of diffusion regions corresponding to coherent lights having different emission wavelength regions, so that in the illuminated region 10a, the emission wavelength regions diffused in the diffusion regions are different. Different coherent lights may be superimposed and illuminated. For example, when red coherent light, green coherent light, and blue coherent light are used as the coherent light L, the illuminated region 10a is mixed with these three colors and illuminated with white.

  Note that the disclosed invention is not limited to the individual embodiments described above. Each embodiment can be appropriately combined as long as the processing contents do not contradict each other.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Moving body main body 3 Optical element 3s Incident surface 4 Coherent light source 5 Light emission timing control part 6 Optical scanning member 9 Moving body 10 Virtual illumination area | region 11, 12 Rotating shaft 13 Reflecting device 13s Reflecting surface 15 Element diffusion area 16 Hologram recording Medium 18 Element hologram area 19 Partial area 21 Speed sensor 22 Imaging device 23 Image processing unit 31 Object

Claims (7)

A mobile body,
An illumination device provided in the mobile body;
With
The lighting device includes:
A coherent light source that emits coherent light;
A light emission timing controller for controlling the light emission timing of the coherent light;
An optical element that diffuses the coherent light whose light emission timing is controlled by the light emission timing control unit;
An optical scanning member for scanning the coherent light from the coherent light source on the optical element;
Have
The optical element has a plurality of element diffusion regions, and each of the plurality of element diffusion regions illuminates a corresponding partial region within a predetermined angle range by diffusing incident coherent light, and At least some of the partial areas illuminated by each of the element diffusion areas are different from each other;
The light emission timing control unit illuminates a stationary object within the predetermined angle range, and expands the angle range of the illuminated region as the object is approached. A moving body characterized by controlling the light emission timing. The light emission timing control unit controls the light emission timing of the coherent light so that the center of the angle range of the illuminated area moves upward and / or laterally as the object is illuminated. The moving body according to claim 1, wherein: A speed sensor for measuring a moving speed of the mobile body,
The said light emission timing control part controls the light emission timing of the said coherent light so that the angle range of the said to-be-illuminated area may be expanded according to the measurement result of the said speed sensor. The moving body described. An imaging device for imaging within the predetermined angular range;
An image processing unit that performs image processing on an imaging result of the imaging device and recognizes a stationary object within the predetermined angle range;
Further comprising
The said light emission timing control part controls the light emission timing of the said coherent light so that the said to-be-illuminated object recognized by the said image process part may be illuminated. Moving body. The optical element is a hologram recording medium;
5. The moving body 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,
The movable body according to claim 1, wherein each of the plurality of element diffusion regions includes the lens array. A coherent light source that emits coherent light;
A light emission timing controller for controlling the light emission timing of the coherent light;
An optical element that diffuses the coherent light whose light emission timing is controlled by the light emission timing control unit;
An optical scanning member for scanning the coherent light from the coherent light source on the optical element;
Have
The optical element has a plurality of element diffusion regions, and each of the plurality of element diffusion regions illuminates a corresponding partial region within a predetermined angle range by diffusing incident coherent light, and At least some of the partial areas illuminated by each of the element diffusion areas are different from each other;
The light emission timing control unit illuminates a stationary object within the predetermined angle range, and expands the angle range of the illuminated region as the object is approached. The lighting device characterized by controlling the light emission timing.

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