JP7001986B2 - Lighting equipment - Google Patents

Description

The present disclosure relates to a lighting device that uses diffracted light from a diffractive optical element as illumination light.

A lighting device that illuminates a road surface in a desired pattern by combining a light source and a hologram element has been proposed (see Patent Document 1). In the lighting device disclosed in Patent Document 1, the laser beam generated by a single light source is diffracted by a single hologram element.

Japanese Unexamined Patent Publication No. 2015-132707

A diffraction pattern is formed in a diffraction optical element such as a hologram element, and when light is incident on this diffraction pattern, an illumination range corresponding to the diffraction pattern can be illuminated. However, in order to illuminate the illumination range having a predetermined shape at a predetermined position, it is necessary to inject light into the diffraction pattern from a predetermined direction. When the direction of the light incident on the diffraction pattern changes, the position and shape of the illumination range change.

In order to illuminate a plurality of illumination ranges, it is conceivable to form a plurality of diffraction patterns on the diffractive optical element, but it becomes difficult to design the diffractive optical element and from the direction determined for each diffraction pattern. Since it is necessary to inject light, the optical configuration of the lighting device may be complicated.

The present disclosure provides a lighting device capable of illuminating a plurality of lighting ranges with a simple optical configuration.

In order to solve the above problems, in one aspect of the present disclosure, a plurality of light sources and
A shaping optical system that shapes the light from the plurality of light sources,
A diffractive optical element that diffracts the light shaped by the shaping optical system is provided.
In the shaping optical system, the light shaped by the shaping optical system is incident on the diffractive optical element at a different incident angle for each of the plurality of light sources.
The diffractive optical element provides a lighting device that diffracts light incident at different incident angles to illuminate a plurality of illumination ranges corresponding to the plurality of light sources.

Each of the plurality of illumination ranges may differ from the other illumination ranges in at least one of the illumination position, the illumination direction, the illumination area, and the illumination shape.

The plurality of illumination ranges may be arranged along at least one direction.

Of the plurality of lighting ranges arranged along the one direction, at least a part of the two lighting ranges arranged adjacent to each other may overlap with each other.

The plurality of illumination ranges are arranged so as to face different directions.
The areas and shapes of the plurality of illumination ranges may be substantially the same.

The plurality of illumination ranges may be arranged at positions separated from each other.

The traveling directions of the light emitted from the plurality of light sources are different from each other.
In the shaping optical system, the light shaped by the shaping optical system may be incident on the diffractive optical element at a different incident angle for each of the plurality of light sources.

The shaping optical system is separately provided for each of the plurality of light sources.
The plurality of shaping optical systems corresponding to the plurality of light sources may incident light on the diffractive optical element at different incident angles.

The plurality of light sources emit light in parallel directions, respectively.
The shaping optical system may emit light emitted from the plurality of light sources in different directions so that the light emitted from the plurality of light sources is incident on the diffractive optical element at different incident angles. good.

The shaping optical system may be provided separately for each of the plurality of light sources.
The plurality of shaping optical systems corresponding to the plurality of light sources may incident light on the diffractive optical element at different incident angles.

A light source control unit that individually controls the lighting and extinguishing of the plurality of light sources may be provided.
The diffractive optical element illuminates the illumination range illuminated by the light from the light source controlled by the light source control unit among the plurality of illumination ranges, and the light from the light source controlled to be extinguished by the light source control unit. You may stop lighting in the lighting range illuminated by.

A light source control unit for individually controlling the lighting or extinguishing of the plurality of light sources is provided.
The diffractive optical element has a diffraction pattern that illuminates an index that points in different directions according to the incident angle of light, and may illuminate the index corresponding to a light source whose lighting is controlled by the light source control unit. ..

Multiple light source units with different emission wavelength bands,
A light source control unit that controls lighting and extinguishing of the light source unit is provided.
The light source unit has the plurality of light sources.
The diffractive optical element may illuminate the plurality of illumination ranges with light from the plurality of light sources of each of the plurality of light source units in an illumination color corresponding to lighting and extinguishing control by the light source control unit. good.

The present disclosure can illuminate a plurality of illumination ranges with a simple optical configuration.

The figure which shows the schematic structure of the lighting apparatus by 1st Embodiment of this disclosure. The figure explaining the illuminated area LZ including a plurality of illumination ranges IL1 and IL2. The figure which shows the example which the vicinity of the end of each illumination range overlaps. The figure which shows the example which each illumination range is arranged at a distance. The figure which shows the schematic structure of the lighting apparatus 1 by one modification of FIG. The figure which shows the schematic structure of the lighting apparatus which provided the shaping optical system separately for each light source whose optical axis center direction is substantially parallel. The figure which shows the schematic structure of the lighting apparatus 1 by the 1st Embodiment which is capable of color illumination. The figure which shows the schematic structure of the lighting apparatus 1 by 2nd Embodiment. The figure which shows the schematic structure of the lighting apparatus 1 by the 2nd Embodiment which is capable of color illumination. The figure which shows the example which displays the index of an arrow on the road surface along the traveling direction of a vehicle. FIG. 9 is a diagram showing a schematic configuration of a lighting device that displays arrows in FIG. 9. The figure which added the light source control part to the lighting apparatus of FIG.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to the present specification, the scale and the aspect ratios are appropriately changed and exaggerated from those of the actual product for the convenience of illustration and comprehension.

Furthermore, as used herein, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle, etc., which specify the shape and geometric conditions and their degrees, are strictly referred to. Without being bound by the meaning, we will interpret it including the range where similar functions can be expected.

(First Embodiment)
FIG. 1 is a diagram showing a schematic configuration of a lighting device 1 according to the first embodiment of the present disclosure. The lighting device 1 in FIG. 1 is used, for example, as a part of a vehicle headlight. However, the lighting device 1 of FIG. 1 can also be applied as various lighting lamps such as a tail light of a vehicle and a searchlight. Further, the vehicle is intended to include not only a vehicle such as an automobile but also various vehicles equipped with a lighting device 1 such as a ship or an airplane. Hereinafter, as an example, an example in which the lighting device 1 of FIG. 1 is applied to a part of the headlight of the vehicle will be described.

The lighting device 1 of FIG. 1 includes a plurality of light sources 2, a plurality of shaping optical systems 3, and one diffractive optical element 4. The light source 2 may be a light source 2 that emits coherent light such as laser light, or may be a light source 2 that emits non-coherent light such as LED (Light Emitting Diode) light. Hereinafter, an example using a light source 2 that emits laser light will be described as an example. In FIG. 1, two light sources 2 are provided, but the number of light sources 2 may be three or more.

The plurality of shaping optical systems 3 are arranged between the plurality of light sources 2 and the diffractive optical element 4, and are provided in association with each light source 2. Each shaping optical system 3 shapes and parallelizes the light from the corresponding light source 2 and causes it to enter the diffractive optical element 4. More specifically, each shaping optical system 3 causes the shaped and parallelized light to be incident on the diffractive optical element 4 at different incident angles for each of the plurality of light sources 2. In this way, the light radiated from the plurality of light sources 2 and passed through the shaping optical system 3 is incident on the diffractive optical element 4 at a different incident angle for each light source 2.

Each orthopedic optical system 3 has a first lens 3a that widens the beam diameter of the coherent light emitted from the light source 2, and a second lens 3b that collimates the coherent light that has passed through the first lens 3a. The coherent light parallelized by the second lens 3b is incident on the diffractive optical element 4. The optical configuration of the shaping optical system 3 is not limited to FIG.

In FIG. 1, each of the plurality of light sources 2 is provided with the shaping optical system 3 separately, and the shaping optical system 3 is provided for the number of the plurality of light sources 2. As will be described later, a plurality of light sources 2 may share one shaping optical system 3.

The second lens 3b in the orthopedic optical system 3 is composed of, for example, a collimator lens. The specific optical configuration of the shaping optical system 3 is not limited. The first lens 3a in the orthopedic optical system 3 is ideally provided at the front focal position of the second lens 3b.

The diffractive optical element 4 diffracts the light radiated from the light source 2 and shaped and parallelized by the shaping optical system 3. More specifically, the diffractive optical element 4 diffracts the light incident at different incident angles for each light source 2 to illuminate the illumination range corresponding to each light source 2 according to the incident angle. In this way, the diffractive optical element 4 illuminates a plurality of illumination ranges IL1 and IL2 as many as the number of the light source 2. The light that illuminates each illumination range is the light emitted from the corresponding light source 2. Since the angle of incidence on the diffractive optical element 4 is different for each light source 2, the number of illumination ranges illuminated by the diffractive optical element 4 increases as the number of light sources 2 increases.

The diffractive optical element 4 is, for example, a hologram element 5. As will be described later, by using the hologram element 5 as the diffraction optical element 4, it becomes easy to design the diffraction characteristics of the hologram element 5, and the diffraction is such that the illumination range of a desired area and shape is illuminated at a desired illumination position. The pattern can be formed relatively easily in the hologram element 5. Hereinafter, an example in which the hologram element 5 is used as the diffractive optical element 4 will be described.

In the present embodiment, it is assumed that a computer-generated hologram (CGH) is used as the plurality of hologram elements 5 so that such a diffraction pattern can be designed on a computer. The CGH does not require an optical system for forming the interference fringes or a blank hologram recording material for forming the interference fringes, and the interference fringe recording process can be performed on a computer, so that the CGH has arbitrary diffraction characteristics. Interference fringes can be easily generated.

In the present specification, the entire illuminated area including the plurality of illuminated areas IL1 and IL2 illuminated by the hologram element 5 is referred to as an illuminated area LZ. The illuminated region LZ is provided on a predetermined two-dimensional plane to which the diffracted light by the hologram element 5 is incident. The predetermined two-dimensional plane is, for example, a road surface on which a vehicle equipped with the lighting device 1 according to the present embodiment travels.

The illuminated area LZ is composed of a plurality of illumination ranges IL1 and IL2 diffracted by the hologram element 5. A part of the plurality of illumination ranges IL1 and IL2 may overlap each other. In this case, the illuminated area LZ is continuous. Further, the plurality of illumination ranges IL1 and IL2 may be arranged apart from each other. In this case, the illuminated area LZ is provided for the number of the plurality of illumination ranges IL1 and IL2.

Next, the characteristic configuration of the lighting device 1 of FIG. 1 will be described in more detail. In the lighting device 1 of FIG. 1, the traveling directions of the light radiated from the plurality of light sources 2 are different from each other. For example, by making the optical axis directions of the plurality of light sources 2 different from each other, the traveling direction of the light from each light source 2 can be made different.

The plurality of shaping optical systems 3 are arranged according to the traveling direction of the light of the corresponding light source 2. More specifically, the plurality of shaping optical systems 3 are arranged so that the optical axis directions of the shaping optical systems 3 substantially coincide with the optical axis center direction of the corresponding light source 2.

In this way, by arranging the plurality of light sources 2 so that the traveling directions of the light are different from each other and arranging the plurality of shaping optical systems 3 in accordance with the traveling directions of the light from the corresponding light sources 2, each shaping is performed. The light that has passed through the optical system 3 is incident on the hologram element 5 at different incident angles.

The hologram element 5 is formed with a diffraction pattern, that is, an interference fringe, which diffracts light from a plurality of incident angles in different directions. More specifically, light from a direction having a larger incident angle with respect to the normal direction of the incident surface of the hologram element 5 illuminates the illumination range on the side closer to the hologram element 5, and the normal of the incident surface of the hologram element 5. Light from a direction having a smaller incident angle with respect to the direction illuminates the illumination range on the side farther from the hologram element 5.

FIG. 2 is a diagram illustrating an illuminated region LZ composed of a plurality of illumination ranges IL1 and IL2. FIG. 2 shows an example in which a plurality of illumination ranges IL1 and IL2 are provided on an xy plane, and two light sources 2 are arranged at an angle to each other in the z direction.

Assuming that the hologram element 5 has a diffraction pattern that diffracts light uniformly in the x direction, the light source 2 having a larger incident angle with respect to the normal direction of the incident surface of the hologram element 5 among the two light sources 2 The light from the light source 2 illuminates the illumination range IL1 closer to the hologram element 5, and the light from the light source 2 having a smaller incident angle illuminates the illumination range IL2 farther from the hologram element 5. The illumination ranges IL1 and IL2 are both trapezoidal in shape, and the larger the distance from the hologram element 5, the larger the area.

In the example of FIG. 2, two illumination ranges IL1 and IL2 are arranged adjacent to each other in the y direction, but as shown in FIG. 3A, the vicinity of the end portion of each illumination range in the y direction overlaps. Or, as shown in FIG. 3B, the illumination ranges may be arranged so as to be spaced apart from each other in the y direction.

When the illuminated area LZ has a trapezoidal shape such that the width in the x direction increases as the distance from the light source 2 increases, as in FIGS. 2, 3A and 3B, the eyes of the observer near the light source 2 see. It is visually recognized that the width of the illuminated area LZ in the x direction is substantially constant up to a distance. Therefore, when the lighting device 1 according to the present embodiment is incorporated into the headlight of the vehicle, the occupant can efficiently visually recognize the lighting with low energy over a predetermined range in front of the traveling direction of the vehicle from near to far.

As described above, the type of the light source 2 according to the present embodiment is not particularly limited, but in order to clearly illuminate the edges of both ends of the illuminated area LZ in the x direction, the light source 2 that emits coherent light such as laser light is used. It is desirable to use.

Although FIG. 1 shows an example in which a plurality of shaping optical systems 3 are provided in association with a plurality of light sources 2, light from a plurality of light sources 2 may be incident on one shaping optical system 3. FIG. 4 is a diagram showing a schematic configuration of the lighting device 1 according to a modification of FIG. 1. Although the lighting device 1 of FIG. 4 shows an example including two light sources 2, it may be provided with three or more light sources 2. Unlike the lighting device 1 of FIG. 1, the optical axis center directions of the light sources 2 in the lighting device 1 of FIG. 4 are arranged substantially in parallel. The light from each light source 2 is incident on the shaping optical system 3, but the light from one light source 2 is incident on the vicinity of the center position of the optical axis of the shaping optical system 3, for example, and the light from the other light source 2 is incidental. For example, the light is incident on the vicinity of a position deviated from the center of the optical axis of the shaping optical system 3. The light incident on the vicinity of the center position of the optical axis of the shaping optical system 3 travels in a direction substantially along the optical axis of the shaping optical system 3 and is incident on the hologram element 5. On the other hand, the light incident on the position deviated from the optical axis center position of the orthopedic optical system 3 is greatly refracted inside the orthopedic optical system 3 and travels in the direction deviated from the optical axis of the orthopedic optical system 3. Then, it is incident on the hologram element 5. Therefore, the light from the two light sources 2 passes through one shaping optical system 3 and is incident on the hologram element 5 at different incident angles. The hologram element 5 diffracts light incident at different incident angles in different directions, and illuminates different illumination ranges as shown in FIGS. 2 and 3.

In FIG. 4, light from a plurality of light sources 2 whose optical axis center directions are substantially parallel is incident on one shaping optical system 3, but each light source 2 may be provided with a separate shaping optical system 3. FIG. 5 is a diagram showing a schematic configuration of a lighting device 1 in which a shaping optical system 3 is separately provided for each of a plurality of light sources 2 whose optical axis center directions are substantially parallel to each other. The shaping optical system 3 corresponding to the light source 2 on the upper side of FIG. 5 has a first lens 3a, a second lens 3b, and a dioptric element 3c such as a prism. The shaping optical system 3 corresponding to the light source 2 on the lower side of FIG. 5 has the first lens 3a and the second lens 3b, but does not have the refraction optical element 3c. The light that has passed through both the second lenses 3b is parallel light that travels in the same direction, but the light that is incident on the dioptric element 3c from the upper second lens 3b is converted in the traveling direction of the light. , Is incident on the hologram element 5. As a result, as in FIG. 4, the hologram element 5 illuminates different illumination ranges with the light from each light source 2.

In FIGS. 1 to 5, an example of illuminating a plurality of illumination ranges IL1 and IL2 with a single color has been described, but various light sources from a plurality of light sources 2 having different emission wavelength bands can be combined in the same illumination range. The illuminated area LZ can be illuminated with color.

FIG. 6 is a diagram showing a schematic configuration of the lighting device 1 according to the first embodiment capable of color lighting. The lighting device 1 of FIG. 6 includes three types of light source units 10 that emit light in the red, green, and blue bands, and three corresponding hologram elements 5. As described with reference to FIGS. 1 to 4, the light source unit 10 of each color has a plurality of (for example, two) light sources 2 that emit light in different directions. Since the shaping optical system 3 is provided for each light source 2, if 3 × 2 = 6 light sources 2 are provided, a total of 6 shaping optical systems 3 are provided. Although FIG. 6 shows only the central light source unit 10 among the three types of light source units 10 arranged in the x direction for simplification, they are actually arranged on both sides in the x direction. The remaining two types of light source units 10 also have two light sources 2 and two shaping optical systems 3, respectively.

The light emitted from the two light sources 2 in each type of light source unit 10 passes through the corresponding shaping optical system 3 and is incident on the corresponding hologram element 5 at different incident angles. The hologram element 5 diffracts light incident at different incident angles in different directions to illuminate a plurality of illumination ranges IL1 and IL2.

Of the light emitted from a plurality of light source units 10 having different emission wavelength bands and diffracted by the corresponding hologram element 5, the light from one light source 2 in each light source unit 10 illuminates one illumination range. , The light from the other light source 2 illuminates the other illumination range. Therefore, each of the two illumination ranges IL1 and IL2 is illuminated with three colors, and the three colors are visually recognized as a mixture of the three colors.

By controlling the lighting and extinguishing of the plurality of types of light source units 10 having different emission wavelength bands for each type of the light source 2, the illumination colors of the plurality of illumination ranges IL1 and IL2 can be switched for each illumination range.

Although FIG. 6 shows an example in which the three hologram elements 5 are arranged side by side in the x direction, they may be arranged side by side in the z direction.

The hologram element 5 may have a plurality of element hologram elements divided vertically and horizontally. Each element hologram element has a diffraction characteristic capable of illuminating the entire area or a part of, for example, a plurality of illumination ranges IL1 and IL2. At least one of the area and shape of each element hologram element does not necessarily have to be the same. If each hologram element 5 has a plurality of element hologram elements and each element hologram element illuminates the entire area of the plurality of illumination ranges IL1 and IL2, the radiance of the hologram element 5 which is a pseudo light source is weakened. However, the lighting range can be brightly illuminated. Therefore, when the coherent light source 2 is used as the light source 2, even if the hologram element 5 is observed from the illuminated area LZ side, the strong coherent light does not enter the human eye, and the risk of damaging the human eye is reduced. And the safety is improved. Further, light from the plurality of element hologram elements is incident at each point of the plurality of illumination ranges IL1 and IL2 constituting the illuminated region LZ at different incident angles. As a result, the light interference patterns are uncorrelatedly overlapped and averaged, and as a result, the speckle becomes inconspicuous within the plurality of illumination ranges IL1 and IL2.

As described above, in the first embodiment, the light emitted from the plurality of light sources 2 is passed through one or a plurality of shaping optical systems 3 and incident on the hologram element 5 at different incident angles, so that the hologram is formed. The element 5 can illuminate the illumination range in the direction corresponding to the incident angle. Therefore, when the light from the plurality of light sources 2 is incident on the hologram element 5 at different incident angles, the hologram element 5 has a plurality of illumination ranges in which at least one of the illumination position, the illumination direction, the illumination area, and the shape is different. IL1 and IL2 can be illuminated. As a specific example, the hologram element 5 can illuminate an illuminated region LZ in which a plurality of illumination ranges IL1 and IL2 are connected in one direction. In the present embodiment, a plurality of illumination ranges IL1 and IL2 having different illumination positions can be illuminated by simply injecting light into the diffraction pattern formed in the hologram element 5 by changing the incident angle, and thus the illumination device. The configuration of 1 can be simplified.

(Second embodiment)
In the second embodiment, the directions of the plurality of illumination ranges IL1 and IL2 are different from each other.

FIG. 7 is a diagram showing a schematic configuration of the lighting device 1 according to the second embodiment. The lighting device 1 of FIG. 7 includes a plurality of light sources 2, a plurality of shaping optical systems 3, and one diffractive optical element 4. The diffractive optical element 4 is composed of, for example, a hologram element 5.

The traveling directions of the light emitted from each light source 2 are different. The direction of the center of the optical axis of the light from each light source 2 and the direction of the optical axis of each shaping optical system 3 are substantially the same. Each shaping optical system 3 shapes and parallelizes the incident light and causes the incident light to be incident on the hologram element 5.

The hologram element 5 is formed with a diffraction pattern that illuminates the illumination range in the direction corresponding to the incident angle of the light at the illumination position corresponding to the incident angle of the light. FIG. 7 shows an example in which the hologram element 5 illuminates a rectangular illumination range arranged in different directions at two different illumination positions. The shape of the illumination range is arbitrary, and may be trapezoidal or other shapes as in the first embodiment. As described above, in the present embodiment, the illumination range in which the direction is different depending on the incident angle of the light incident on the hologram element 5 is illuminated.

The example of FIG. 7 shows an example in which the shapes and areas of the two illumination ranges IL1 and IL2 are substantially the same, but at least one of the shapes and areas of the two illumination ranges IL1 and IL2 are different from each other. You may.

FIG. 7 shows an example of illuminating two illumination ranges IL1 and IL2 with a single color. Similar to FIG. 6, a plurality of types of light source units 10 having different emission wavelength bands are provided to change the illumination color in various ways. You may be able to do it.

FIG. 8 is a diagram showing a schematic configuration of a lighting device 1 according to a second embodiment capable of color lighting. Similar to FIG. 6, the lighting device 1 of FIG. 8 includes three types of light source units 10 that emit light in the red, green, and blue bands, and three corresponding hologram elements 5. It is the same as in FIG. 6 that each type of light source unit 10 has two light sources 2. The light diffracted by the three hologram elements 5 illuminates the two illumination ranges IL1 and IL2 according to the angle of incidence on each hologram element 5. Therefore, the two illumination ranges IL1 and IL2 are each illuminated with three colors, and each color is visually recognized as a combined color.

Although FIG. 8 shows an example in which the three hologram elements 5 are arranged side by side in the x direction, they may be arranged side by side in the z direction.

When the lighting device 1 according to the present embodiment is incorporated into, for example, a headlight of a vehicle, an index of a lighting mode having an arbitrary shape and area can be displayed in a plurality of lighting ranges IL1 and IL2. For example, FIGS. 9 and 10 show an example of displaying an arrow index on the road surface along the traveling direction of the vehicle.

The arrow in FIG. 9 is not always displayed on the road surface, but is displayed as needed. Further, the three arrows are not always displayed at the same time, and any one or two may be displayed.

FIG. 10 is a diagram showing a schematic configuration of a lighting device 1 that displays an arrow in FIG. 9. The lighting device 1 of FIG. 10 includes three light sources 2, three shaping optical systems 3, and one diffractive optical element 4. The diffractive optical element 4 is, for example, a hologram element 5.

The three light sources 2 emit light in different directions. The light from each light source 2 is shaped and parallelized by the corresponding shaping optical system 3 and is incident on the hologram element 5 at different incident angles. As a result, the hologram element 5 displays the arrows IL1 to IL3 in the direction corresponding to the incident angle at the irradiation position corresponding to the incident angle.

FIG. 11 is a diagram in which a light source control unit 7 is added to the lighting device 1 of FIG. The light source control unit 7 individually controls the lighting and extinguishing of the three light sources 2. For example, when only one light source 2 is turned on and the remaining two light sources 2 are turned off, only one of the three arrows corresponding to the light source 2 is displayed. Therefore, for example, if the lighting device 1 of FIG. 10 is incorporated in the headlight of the vehicle and linked with the navigation device, the recommended route of the vehicle can be displayed by an arrow in front of the corner.

As described above, in the second embodiment, a plurality of light sources 2 and a plurality of shaping optical systems 3 that irradiate light in different directions are provided, and light is incident on the diffractive optical element 4 from a plurality of incident angles. With the diffracted light generated by the diffractive optical element 4, indexes in different directions can be displayed at a plurality of irradiation positions. Therefore, by individually controlling the lighting and extinguishing of each light source 2, an arbitrary index can be displayed at an arbitrary timing.

The light source control unit 7 of FIG. 11 may be provided in the lighting device 1 of FIG. 1, FIG. 4, or FIG. As a result, the hologram element 5 in each lighting device 1 illuminates the illumination range illuminated by the light from the light source 2 controlled by the light source control unit 7 among the plurality of illumination ranges, and the light source control unit 7 turns off. It is possible to stop the illumination in the illumination range illuminated by the light from the controlled light source 2.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Lighting device, 2 Light source, 3 Orthopedic optical system, 3a 1st lens, 3b 2nd lens, 4 Diffractive optical element, 5 Hologram element, 7 Light source control unit, 10 Light source unit

Claims (11)

With multiple light sources
A shaping optical system that shapes the light from the plurality of light sources,
A diffractive optical element that diffracts the light shaped by the shaping optical system is provided.
In the shaping optical system, the light shaped by the shaping optical system is incident on the diffractive optical element at a different incident angle for each of the plurality of light sources.
The diffractive optical element diffracts light incident at different incident angles to illuminate a plurality of illumination ranges corresponding to the plurality of light sources.
The plurality of illumination ranges are arranged along the normal direction of the incident surface of the diffractive optical element.
The diffractive optical element has a plurality of element diffractive optical elements.
Each of the plurality of element diffractive optical elements diffracts the light incident at the different incident angles and illuminates the entire area of the plurality of illumination ranges arranged along the normal direction of the incident surface of the diffractive optical element. Illumination device with possible diffraction characteristics. The lighting device according to claim 1, wherein each of the plurality of lighting ranges is different from the other lighting ranges in at least one of a lighting position, a lighting direction, a lighting area, and a lighting shape. The lighting device according to claim 1 or 2, wherein the plurality of lighting ranges are arranged adjacent to each other in the normal direction. The lighting device according to claim 1 or 2, wherein at least a part of the two lighting ranges arranged adjacent to each other among the plurality of lighting ranges arranged along the normal direction overlap each other. The lighting device according to claim 1 or 2, wherein the plurality of lighting ranges are arranged at positions separated from each other. The traveling directions of the light emitted from the plurality of light sources are different from each other.
The method according to any one of claims 1 to 5, wherein the shaping optical system causes light shaped by the shaping optical system to be incident on the diffractive optical element at different incident angles for each of the plurality of light sources. Lighting equipment. The shaping optical system is separately provided for each of the plurality of light sources.
The lighting device according to claim 6, wherein the plurality of shaping optical systems corresponding to the plurality of light sources incident light on the diffractive optical element at different incident angles. The plurality of light sources emit light in parallel directions, respectively.
The shaping optical system claims that the light emitted from the plurality of light sources is emitted in different directions so that the light emitted from the plurality of light sources is incident on the diffractive optical element at different incident angles. Item 6. The lighting device according to any one of Items 1 to 5. The shaping optical system is separately provided for each of the plurality of light sources.
The lighting device according to claim 8, wherein the plurality of shaping optical systems corresponding to the plurality of light sources incident light on the diffractive optical element at different incident angles. It is provided with a light source control unit that individually controls the lighting and extinguishing of the plurality of light sources.
The diffractive optical element illuminates the illumination range illuminated by the light from the light source whose lighting is controlled by the light source control unit among the plurality of illumination ranges, and the light from the light source whose extinguishing control is controlled by the light source control unit. The lighting device according to any one of claims 1 to 9, wherein the lighting in the lighting range illuminated by the above is stopped. Multiple light source units with different emission wavelength bands,
A light source control unit that controls lighting and extinguishing of the light source unit is provided.
The light source unit has the plurality of light sources.
The diffractive optical element is claimed to illuminate the plurality of illumination ranges with light from the plurality of light sources of each of the plurality of light source units in illumination colors corresponding to lighting and extinguishing control by the light source control unit. Item 6. The lighting device according to any one of Items 1 to 9.

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