JP6986216B2 - Lighting equipment - Google Patents

Description

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

A lighting device that illuminates a region such as a road surface in a desired pattern by combining a light source and a hologram element is known. For example, according to the vehicle lighting device disclosed in Patent Document 1, information such as characters can be projected onto a road surface by using a laser beam and a hologram.

Japanese Unexamined Patent Publication No. 2015-132707

By using coherent light such as laser light in combination with diffractive optical elements such as hologram elements as described above, it is possible to illuminate a relatively wide range of illumination areas with a desired pattern, and the observer can illuminate the illumination area. The desired pattern projected on the screen can be safely visually recognized. Therefore, the above-mentioned lighting device using the coherent light and the diffractive optical element can be applied not only to the vehicle field but also to devices in various fields.

On the other hand, lighting devices are required to be further devised to provide various information in various forms. For example, in the field of lighting equipment for vehicles, it is necessary to effectively provide information related to traffic, etc. to the passengers, pedestrians, or passengers of other vehicles of each vehicle and call their attention. Further proposals for possible lighting forms are desired. Further, the lighting device is required not only to show excellent lighting performance and information providing performance, but also to perform an optical display having good design according to the equipment used and the environment in which it is used.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lighting device capable of lighting and light display in various forms.

One aspect of the present invention includes a light source unit, a first diffractive optical element, and a light guide optical system that guides light from the light source unit to the first diffractive optical element, and the first diffractive optical element is incident. The light emitted in the first pattern and the light emitted from the first diffractive optical element relates to a lighting device projected on the illumination region in the second pattern.

The first diffraction optical element may be a light-shielding portion arranged according to the first pattern, and may have a light-shielding portion that blocks at least a part of light.

The first diffractive optical element may have one or more types of color filters arranged according to the first pattern.

The light source unit includes a plurality of light sources that emit light having different wavelengths from each other, and the light guide optical system emits light emitted from each of the plurality of light sources in the first pattern of the first diffractive optical element and the light. It may lead to a region defined based on the wavelength.

The light guide optical system may scan the light from the light source unit on the first diffraction optical element.

The light guide optical system may modulate the spatial distribution of the light from the light source unit according to the first pattern, and guide the modulated light to the first diffraction optical element.

The light guide optical system has a second diffractive optical element that emits the incident light in the first pattern, and the light emitted from the second diffractive optical element has the first pattern on the first diffractive optical element. It may be projected.

The first diffractive optical element includes a plurality of element diffusion regions, and the plurality of element diffusion regions may emit light toward the same range with each other in the illumination region.

The first diffractive optical element includes a plurality of element diffusion regions, and the plurality of element diffusion regions may emit light toward different ranges in the illumination region.

The first pattern may have the same pattern as the second pattern.

The first pattern may have a different pattern from the second pattern.

According to the present invention, it is possible to provide a lighting device that enables various forms of lighting and light display.

FIG. 1 is a diagram showing a schematic configuration of a lighting device according to a first embodiment. FIG. 2 is a diagram schematically showing a first pattern of light emitted from a first diffractive optical element and a second pattern of light projected onto an illumination region in the first embodiment. FIG. 3 is a diagram showing a schematic configuration of a lighting device according to a second embodiment. FIG. 4 is a diagram schematically showing a first pattern of light emitted from a first diffractive optical element and a second pattern of light projected onto an illumination region in a second embodiment. FIG. 5 is a diagram showing a schematic configuration of a lighting device according to a third embodiment. FIG. 6 is a diagram schematically showing a first pattern of light emitted from the first diffractive optical element and a second pattern of light projected onto the illumination region in the third embodiment. FIG. 7 is a diagram showing a schematic configuration of a lighting device according to a fourth embodiment. FIG. 8 is a diagram schematically showing a first pattern of light emitted from the first diffractive optical element and a second pattern of light projected onto the illumination region in the fourth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product for the convenience of illustration and comprehension. In addition, terms and values that specify the shapes, geometric conditions, and their degrees as used herein (eg, terms such as "parallel", "orthogonal", and "identical", and values such as length and angle). Is not bound by the strict meaning, but should be interpreted including the range in which similar functions can be expected.

The lighting device 10 according to each of the following embodiments is assumed to be used as a vehicle light (for example, a headlight or a taillight), but its application target and usage mode are not particularly limited. For example, the lighting device 10 according to each of the following embodiments can be applied to a lighting device installed on a moving body other than a vehicle (for example, a ship or an airplane) or a non-moving body such as a road. .. Further, the lighting device 10 according to each of the following embodiments can be applied to a lighting device used for applications other than headlights and taillights, for example, a lighting device for general indoor and outdoor lighting, and a sign. It is possible to apply the lighting device 10 according to each of the following embodiments to lights, floodlights (spotlights), emergency lights, guide lights and the like.

[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a lighting device 10 according to a first embodiment. FIG. 2 schematically shows a first pattern P1 of light L emitted from the first diffraction optical element 13 and a second pattern P2 of light L projected onto the illumination region R in the first embodiment. It is a figure shown in.

As shown in FIG. 1, the lighting device 10 of the present embodiment includes a light source unit 11, a light guide optical system 12, and a first diffraction optical element 13.

The light source unit 11 emits light L toward the light guide optical system 12. The light L emitted from the light guide optical system 12 may be coherent light such as laser light or non-coherent light such as LED (Light Emitting Diode) light. Further, the light source unit 11 may include a single light source or may include a plurality of light sources, and typically contains light having different wavelength ranges (for example, red light, green light, and blue light). ) Can be configured as the light source unit 11. The light emission of the light source unit 11 can be turned on and off (that is, on and off) by a control device (not shown), and when a plurality of light sources are provided, the light emission is controlled on and off for each light source. The presence or absence of light emission may be related to each other between the light sources. Further, instead of or in addition to controlling the light emission of the light source unit 11, a shutter is installed between the light source unit 11 (for example, each light source) and the light guide optical system 12, and the opening and closing of the shutter is not shown. It may be controlled by a control device.

The light guide optical system 12 is arranged between the light source unit 11 and the first diffraction optical element 13, shapes the light L from the light source unit 11, and guides the shaped light L to the first diffraction optical element 13. The light guide optical system 12 shown in FIG. 1 is composed of a convex lens 12a and a cylindrical lens 12b, but the specific configuration of the light guide optical system 12 is not particularly limited. That is, by a single type of optical system or a combination of a plurality of types of optical systems capable of shaping the light L from the light source unit 11 into an appropriate shape according to the shape of the light incident region of the first diffraction optical element 13. The light guide optical system 12 can be configured. Therefore, the light guide optical system 12 may include, for example, a collimating lens, and the parallelized light L may be incident on the first diffraction optical element 13.

Further, in FIG. 1, the light source unit 11, the light guide optical system 12, and the first diffraction optical element 13 are shown to be arranged on the same straight line, but in reality, the arrangement positions of these elements are Not limited. That is, the light guide optical system 12 may be provided between the light source unit 11 and the first diffraction optical element 13 in the traveling path of the light L, and the light source unit 11 and the first diffraction optical element 13 do not necessarily have to be provided in a specific direction. It does not have to be provided between. Therefore, the traveling direction of the light L from the light source unit 11 to the light guide optical system 12 and the traveling direction of the light L from the light guide optical system 12 to the first diffraction optical element 13 may be the same as each other. , May be different from each other. When changing the traveling path of the light L, an optical element such as a mirror that can change the traveling direction of the light L by reflection or the like may be appropriately arranged.

When the light source unit 11 includes a plurality of light sources, a separate light guide optical system 12 may be provided for each light source. Therefore, when a plurality of types of light L having different wavelength ranges are emitted from the light source unit 11, a plurality of types of light are provided by the plurality of light guide optical systems 12 optimized according to the characteristics of the various light L. It is also possible to appropriately incident L on the first diffraction optical element 13.

The first diffraction optical element 13 diffracts the light L from the light guide optical system 12, emits the light L at an angle corresponding to the incident angle, and illuminates the illumination region R with the emitted light L. The specific configuration of the first diffractive optical element 13 is not particularly limited, but typically the first diffractive optical element 13 can be configured by a hologram element. When the hologram element is used as the first diffraction optical element 13, it is easy to design the diffraction characteristics, and the first diffraction optical element 13 can be relatively easily provided with a diffraction pattern for illuminating a desired range in the illumination region R. .. Further, one of the other advantages of the hologram element is that the energy density of the light L (for example, laser light) from the light source can be reduced by diffusion. Another advantage of the hologram element is that the first diffraction optical element 13 can be used as a directional surface light source, so that the same illuminance distribution is achieved as compared with a lamp light source that functions as a conventional point light source. It is possible to reduce the brightness on the light source surface for this purpose. Therefore, by using the hologram element as the first diffractive optical element 13, it is possible to safely use light having a high energy density such as laser light as the light L from the light source unit 11, and the first diffractive optical element. Even if the light L that has passed through 13 is directly viewed by the human eye, there is less possibility that the light L will have an adverse effect on the human eye as compared with the case where the single point light source is directly viewed.

The method for forming the diffraction pattern of the first diffraction optical element 13 is not particularly limited. For example, the first diffraction optical element 13 having a desired diffraction pattern is formed by irradiating the hologram photosensitive material with reference light and object light made of coherent light having interference with each other to form interference fringes on the hologram photosensitive material. It is possible to make. It is also possible to realize the diffraction pattern of the first diffraction optical element 13 by using a computer-generated hologram (CGH), and in this case, design interference fringes having arbitrary diffraction characteristics on a computer. It can be done and is highly convenient.

When the light source unit 11 includes a plurality of light sources, one first diffractive optical element 13 may be shared between the light sources, or a separate first diffractive optical element 13 may be provided for each light source. When one first diffractive optical element 13 is shared between light sources, a specific range of the first diffractive optical element 13 is assigned to each light source, and the incident range of light L in the first diffractive optical element 13 is set. It may be different between the light sources. Therefore, when a plurality of types of light L having different wavelength ranges are emitted from the light source unit 11, the light guide optical system 12 is the range of the first diffraction optical element 13 optimized according to the characteristics of various light L. It is also possible to incident a plurality of types of light L on the subject.

As shown in FIG. 2, the first diffractive optical element 13 emits the light L incident from the light guide optical system 12 in the first pattern P1, and the light L emitted from the first diffractive optical element 13 is illuminated. The second pattern P2 is projected onto the region R.

The first diffraction optical element 13 of the present embodiment has a light-shielding portion 22 arranged according to the first pattern P1. The light-shielding unit 22 acts as a mask that blocks at least a part (in the present embodiment) of the light L incident from the light guide optical system 12. Therefore, by utilizing the contrast of the light L formed between the "location where the light-shielding portion 22 is arranged" and the "location where the light-shielding portion 22 is not arranged" in the first diffraction optical element 13, the first The light L of the pattern P1 can be emitted from the first diffractive optical element 13, and any design or information (for example, a picture, a pattern (pattern), characters, symbols, etc.) can be displayed on the first diffractive optical element 13. .. The first pattern P1 may or may not include one or a plurality of cyclically repeated unit patterns.

In the first diffractive optical element 13 shown in FIG. 2, a plurality of light-shielding portions 22 are arranged in a checkered flag shape, the first pattern P1 is composed of a checkered flag-shaped pattern, and the first diffractive optical element 13 is a light guide. The light L incident from the optical system 12 is emitted in a checker flag-like pattern. Therefore, the person who observes the first diffraction optical element 13 can visually recognize the light L of the checker flag-like pattern. Note that FIG. 2 merely illustrates the light-shielding portion 22, and the specific configuration and specific arrangement mode of the light-shielding portion 22 are not particularly limited. For example, the light-shielding portion 22 may be configured by a light-shielding film, and by attaching the light-shielding film to a predetermined position (for example, the surface on the light guide optical system 12 side) of the diffraction element corresponding to the first pattern P1, the present invention The first diffraction optical element 13 of the embodiment can be configured.

Then, the light L (that is, diffracted light) emitted from the first diffractive optical element 13 in the first pattern P1 is projected by the second pattern P2 in the illumination region R. In FIG. 2, the second pattern P2 is configured by the annular pattern, but the second pattern P2 may be configured by another pattern, and any design or information (for example, a picture, a pattern (pattern)) may be formed. , Characters, symbols, etc.) can be projected onto the illumination area R as the second pattern P2. The second pattern P2 may or may not include one or more unit patterns that are periodically repeated. The illumination region R on which the second pattern P2 is projected is a region illuminated by the light L emitted from the first diffraction optical element 13. When the lighting device 10 is mounted on a vehicle, the lighting area R is usually formed by the road surface on which the vehicle travels, and is projected onto the lighting area R by a occupant, a pedestrian, or a occupant of another vehicle. The light L of the second pattern P2 becomes visible.

The first diffraction optical element 13 shown in FIG. 2 is divided into a plurality of element diffusion regions 21, and each element diffusion region 21 is composed of a hologram element. Each element diffusion region 21 shown in FIG. 2 has a rectangular shape, but the shape of the element diffusion region 21 is not particularly limited, and the element diffusion regions 21 may have the same shape and area as each other, or may have the same shape and area as each other. It may have different shapes and areas.

In the first diffraction optical element 13 shown in FIG. 2, the light-shielding portion 22 is arranged in one of the element diffusion regions 21 arranged adjacent to each other in the vertical and horizontal directions, and the light-shielding portion 22 is not arranged in the other. The light L emitted from each of the element diffusion regions 21 in which the light-shielding portion 22 is not arranged travels in the angular space determined according to its own diffraction pattern and illuminates the assigned range of the illumination region R. At this time, the light L from each element diffusion region 21 may illuminate the entire illumination region R, or may illuminate only a part of the illumination region R. Further, the plurality of element diffusion regions 21 constituting the first diffraction optical element 13 may include two or more element diffusion regions 21 that emit light L toward the same range in the illumination region R. Two or more element diffusion regions 21 that emit light L toward different ranges in the illumination region R may be included. Therefore, all of the plurality of element diffusion regions 21 constituting the first diffraction optical element 13 may emit light L toward the same range (that is, the entire illumination region R), or may be directed to different ranges. The light L may be emitted.

As described above, according to the illumination device 10 of the present embodiment, the light L of the first pattern P1 can be emitted from the first diffraction optical element 13, and the second pattern P2 is on the illumination region R. Light L can be projected. This makes it possible to provide the observer with the display of the first pattern P1 on the first diffraction optical element 13 in addition to the display of the second pattern P2 in the illumination region R.

The first diffraction optical element 13 shown in FIG. 2 adopts a checker flag-like pattern as the first pattern P1 to give a new design to the mounted vehicle, but other patterns are used as the first pattern. By adopting it as P1, it is possible to give other design features with excellent design to the mounted vehicle. Further, by adopting a pattern showing specific information (for example, information related to traffic or the like) as the first pattern P1 and arranging the light-shielding portion 22 according to such a first pattern P1, the first diffraction optical element 13 , It is possible to provide each person with the specific information to call attention.

Further, in the lighting device 10 shown in FIG. 2, the light display pattern (that is, the first pattern) on the first diffraction optical element 13 has a pattern different from the projection pattern (that is, the second pattern) of the light L in the illumination region R. However, the configuration of these first pattern and the second pattern is not particularly limited. Therefore, each of the first pattern and the second pattern may be a pattern other than the pattern shown in FIG. 2, and the first pattern may have the same pattern as the second pattern.

Further, in the above description, the case where the light-shielding unit 22 mainly blocks the entire light L incident on the light-shielding unit 22 from the first diffraction optical element 13 has been described, but the light-shielding unit 22 is a light-shielding unit from the first diffraction optical element 13. Only a part of the light L incident on the 22 may be blocked. For example, each light-shielding unit 22 may produce a contrast of light L by blocking only a part of the light L incident on the light-shielding unit 22 over substantially the entire wavelength range. Further, the first diffractive optical element 13 may have one or a plurality of types of color filters arranged according to the first pattern P1 as the light-shielding portion 22, and each light-shielding portion 22 is incident on the light-shielding portion 22. Only a specific wavelength range component of the light L may be blocked. In this case, it is possible to display the first pattern P1 in chromatic colors according to the color filter on the first diffraction optical element 13. In particular, by disposing a plurality of types of color filters that block different wavelength ranges as the light-shielding portion 22, it is possible to display the first pattern P1 in a plurality of colors on the first diffraction optical element 13. ..

[Second Embodiment]
In the present embodiment, the same or similar elements as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 3 is a diagram showing a schematic configuration of the lighting device 10 according to the second embodiment. FIG. 4 schematically shows a first pattern P1 of light L emitted from the first diffraction optical element 13 and a second pattern P2 of light L projected onto the illumination region R in the second embodiment. It is a figure shown in.

In the lighting device 10 of the present embodiment, as shown in FIG. 3, in addition to the light source unit 11 and the first diffraction optical element 13, a scanning device 15 is provided as a light guide optical system 12, and the light source unit 11 and the scanning device are provided. A control device 16 is connected to the control device 16.

The scanning device 15 can change the traveling direction of the light L from the light source unit 11 to scan the light L in the entire range or a partial range on the first diffraction optical element 13. The configuration of the scanning device 15 is not particularly limited, but typically, the scanning device 15 can be configured by using a polygon mirror, a galvano mirror, or the like. As described above, the light guide optical system 12 of the present embodiment scans the light L from the light source unit 11 on the first diffraction optical element 13.

When the light source unit 11 includes a plurality of light sources (for example, R light source 11R, G light source 11G, and B light source 11B), a separate scanning device 15 may be provided for each light source, or light from the plurality of light sources may be provided. One scanning device 15 may be shared with respect to L. Further, the specific arrangement position of the scanning device 15 is not particularly limited, and the scanning device 15 can be arranged at an arbitrary position between the light source unit 11 and the first diffraction optical element 13 in the traveling path of the light L. be. Further, an arbitrary optical system may be arranged between the light source unit 11 and the scanning device 15 or between the scanning device 15 and the first diffraction optical element 13, if necessary.

The control device 16 controls the light source unit 11 and the scanning device 15, and adjusts the on / off (that is, light emission and non-light emission) of the light emission by the light source unit 11 while adjusting the traveling direction of the light L by the scanning device 15. Can be adjusted. By controlling the light emission of the light L and the scanning position of the light L on the first diffractive optical element 13 in this way, the light L is incident only on a desired portion on the first diffractive optical element 13. On the other hand, it is possible to prevent the light L from being incident on other parts.

For example, when the light source unit 11 includes a plurality of light sources that emit light in different wavelength ranges, the scanning device 15 uses the light L emitted from each of the plurality of light sources under the control of the control device 16 as the first diffraction optical element. Of the thirteen, it is possible to lead to a region determined based on the wavelength of the first pattern P1 and the light L. Therefore, while only the light L from a specific one of the plurality of light sources is incident on a certain range of the first diffractive optical element 13, a plurality of light sources are incident on the other range of the first diffractive optical element 13. It is also possible to superimpose the light L from two or more of the light sources. As a result, the first pattern P1 can be configured with various shades, and any pattern having various colors and patterns (for example, a pattern such as the French flag) can be used as the first pattern P1 for the first diffraction optical element. It can be displayed at 13.

Other configurations are the same as those of the lighting device 10 of the first embodiment described above.

According to the lighting device 10 of the present embodiment, the light L is incident on the desired range on the first diffractive optical element 13 by controlling the scanning of the light L by the scanning device 15 while controlling the light emission from the light source unit 11. Can be made to. Thereby, the optical display of the first pattern P1 can be performed on the first diffraction optical element 13 in various forms.

In particular, when the light source unit 11 includes a plurality of light sources, the optical display of various first patterns P1 having various colors and patterns can be performed on the first diffraction optical element 13. Therefore, a variety of designs can be added to the mounted vehicle, and an optical display that can more effectively call the observer's attention can be performed on the first diffraction optical element 13.

Although the case where the light emission of the light source unit 11 is controlled to be turned on and off has been described above, the presence or absence of light L incident on the scanning device 15 may be controlled by another method. For example, a shutter (not shown) is installed between the light source unit 11 and the scanning device 15, and the opening / closing of the shutter is controlled by the control device 16, so that the light L emitted from the light source unit 11 is incident on the scanning device 15. The presence or absence may be adjusted.

[Third Embodiment]
In the present embodiment, the same or similar elements as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a diagram showing a schematic configuration of the lighting device 10 according to the third embodiment. FIG. 6 schematically shows a first pattern P1 of light L emitted from the first diffraction optical element 13 and a second pattern P2 of light L projected onto the illumination region R in the third embodiment. It is a figure shown in.

In the lighting device 10 of the present embodiment, as shown in FIG. 5, as the light guide optical system 12, a convex lens 12a, a collimating lens 12c, and a spatial light modulator (SLM: Spatial Light Modulator) 18 are provided.

In the convex lens 12a, the light L from the light source unit 11 is incident, the diameter of the light L (that is, the beam diameter) is enlarged, and the light L is emitted toward the collimating lens 12c. In the collimating lens 12c, the light L from the convex lens 12a is incident, the light L is parallelized, and the light L is emitted toward the spatial light modulator 18.

In the spatial light modulator 18, the light L from the collimating lens 12c is incident, the spatial distribution of the light L is modulated according to the first pattern P1, and the light L is directed toward the first diffraction optical element 13. Emit. The specific configuration of the spatial light modulation device 18 is not particularly limited, and the spatial light modulation device 18 can be realized by any element. Therefore, for example, a DLP (registered trademark) display system using a micromirror reflective panel (DMD), an LCOS (Liquid Crystal On Silicon) display system, a shutter, an aperture, a light-shielding patterned reflector, or the like can be used. It is possible to configure the spatial light modulator 18.

The convex lens 12a and the collimating lens 12c shape the light L from the light source unit 11 and guide the light L to the incident region of the spatial light modulator 18. The spatial light modulator 18 modulates the spatial distribution of the light L that has reached the incident region, emits the modulated light L, and transfers the light L to the first diffraction optical element 13 in the first pattern P1. Make it incident. As a result, the first diffraction optical element 13 emits the incident light L in the first pattern P1 (triangular pattern in FIG. 6). As described above, the spatial light modulator 18 of the present embodiment modulates the spatial distribution of the light L from the light source unit 11 according to the first pattern P1, and the modulated light L is the first diffraction optical element 13. Lead to.

When the light source unit 11 includes a plurality of light sources, a light guide optical system 12 may be provided for each light source, and the spatial light modulator 18 provided for each light source is optimized for the corresponding light source. May be. Therefore, when a plurality of types of light L having different wavelength ranges are emitted from the light source unit 11, the spatial light modulation device 18 provided for each light source causes the spatial distributions of the different types of light L to be different from each other. It may be the same or it may be the same.

Other configurations are the same as those of the lighting device 10 of the first embodiment described above.

According to the lighting device 10 of the present embodiment, since the spatial light modulation device 18 can adjust the spatial distribution of the light L irradiating the first diffractive optical element 13, the light incident on the first diffractive optical element 13. The light L can be guided to any place in the region. Thereby, the optical display of the first pattern P1 can be performed on the first diffraction optical element 13 in various forms.

In particular, when the spatial modulation of the light L by the spatial light modulation device 18 can be controlled by a control device (not shown), the irradiation pattern of the light L on the first diffractive optical element 13 and the light L from the first diffractive optical element 13. The emission pattern (that is, the first pattern P1) can be dynamically changed. In this case, the second pattern P2 of the light L in the illumination region R may or may not be changed according to the change of the first pattern P1. When the first diffractive optical element 13 is divided into a plurality of element diffusion regions 21 (see FIG. 2), the light L (that is, diffracted light) is guided to different ranges in the illumination region R between the element diffusion regions 21. By designing the diffraction pattern of the 1-diffraction optical element 13, it is possible to change the second pattern P2 according to the change of the first pattern P1. On the other hand, by designing the diffraction pattern of the first diffraction optical element 13 so that the light L is guided to the same range in the illumination region R (that is, the entire illumination region R) between the element diffusion regions 21, the first pattern P1 It is possible to keep the second pattern P2 unchanged regardless of the change in.

[Fourth Embodiment]
In the present embodiment, the same or similar elements as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 7 is a diagram showing a schematic configuration of the lighting device 10 according to the fourth embodiment. FIG. 8 schematically shows a first pattern P1 of light L emitted from the first diffraction optical element 13 and a second pattern P2 of light L projected onto the illumination region R in the fourth embodiment. It is a figure shown in.

In the lighting device 10 of the present embodiment, as shown in FIG. 7, as the light guide optical system 12, a convex lens 12a, a collimating lens 12c, a second diffraction optical element 19, and a collimating lens 12d are provided.

In the convex lens 12a, the light L from the light source unit 11 is incident, the diameter of the light L is enlarged, and the light L is emitted toward the collimating lens 12c. In the collimating lens 12c, the light L from the convex lens 12a is incident, the light L is parallelized, and the light L is emitted toward the second diffraction optical element 19.

The second diffracting optical element 19 diffracts the light L from the collimating lens 12c and emits the incident light L in the first pattern P1. The specific configuration of the second diffractive optical element 19 is not particularly limited, but it can be configured by a hologram element (for example, CGH) like the first diffractive optical element 13. The light L emitted from the second diffractive optical element 19 is parallelized by the collimating lens 12d and then projected onto the first diffractive optical element 13 in the first pattern P1.

The collimating lens 12d does not necessarily have to be provided, and when the collimating lens 12d is not provided, the light L emitted from the second diffractive optical element 19 is directly placed on the first diffractive optical element 13. It is projected by the first pattern P1. Further, instead of the collimating lens 12d or in addition to the collimating lens 12d, another optical system may be provided between the second diffractive optical element 19 and the first diffractive optical element 13.

When the light source unit 11 includes a plurality of light sources, a separate light guide optical system 12 may be provided for each light source. In particular, the second diffraction optical element 19 may be shared between the light sources, or may be provided separately for each light source. When one second diffractive optical element 19 is shared between light sources, a specific range of the second diffractive optical element 19 is assigned to each light source, and the incident range of light L in the second diffractive optical element 19 is set. It may be different between the light sources. Therefore, when a plurality of types of light L having different wavelength ranges are emitted from the light source unit 11, there are a plurality of types with respect to the range of the second diffraction optical element 19 optimized according to the characteristics of the various light L. It is also possible to incident the light L of.

Other configurations are the same as those of the lighting device 10 of the first embodiment described above.

According to the lighting device 10 of the present embodiment, the first pattern P1 of the light L emitted from the first diffractive optical element 13 can be adjusted by the second diffractive optical element 19. Therefore, even when the first pattern P1 has a complicated shape, the light L of the first pattern P1 can be converted into the first diffraction optical element 13 by devising the diffraction pattern of the second diffraction optical element 19. On the other hand, it can be accurately incident. Thereby, the optical display of the first pattern P1 on the first diffractive optical element 13 can be performed in various forms, and the visibility of the optical display of the first pattern P1 on the first diffractive optical element 13 can be improved. You can expect improvement.

Further, by using two diffractive optical elements (that is, the first diffractive optical element 13 and the second diffractive optical element 19), the light L of the first pattern P1 is appropriately shaped without using a light-shielding portion. The light L of the desired second pattern P2 can be projected onto the illumination region R. Therefore, the light L emitted from the light source unit 11 can be efficiently used, and the light L of the first pattern P1 emitted from the first diffraction optical element 13 and the second pattern projected on the illumination region R can be used. Both of the light L of P2 can be brightened.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples, and the scope of the present invention is not intended to be limited by the above-described embodiments. In the above-described embodiment and other embodiments, it is possible to omit, replace or change some elements without departing from the gist of the invention. The above-described embodiments, other embodiments and various modifications are included in the scope and gist of the present invention, and are included in the invention described in the claims and the equivalent scope thereof.

10 ... Illumination device, 11 ... Light source unit, 11R ... R light source, 11G ... G light source, 11B ... B light source, 12 ... Light guide optical system, 12a ... Convex lens, 12b ... Cylindrical lens, 12c ... Collimated lens, 12d ... Collimating lens , 13 ... 1st diffractive optical element, 15 ... scanning device, 16 ... control device, 18 ... spatial light modulator, 19 ... second diffractive optical element, 21 ... element diffusion region, 22 ... shading part, L ... light, P1 ... 1st pattern, P2 ... 2nd pattern, R ... Illumination area

Claims (10)

Light source part and
The first diffraction optical element composed of the hologram element and
A light guide optical system that shapes the light from the light source unit according to the shape of the light incident region of the first diffractive optical element and guides the light to the first diffractive optical element.
The first diffractive optical element emits the incident light in a first pattern representing at least one of a picture, a letter and a symbol.
The light emitted from the first diffractive optical element is projected onto the illumination region in a second pattern.
The first diffractive optical element is a light-shielding portion arranged according to the first pattern, and has a light-shielding portion that blocks at least a part of the light.
The first diffractive optical element includes a plurality of element diffusion regions.
The plurality of element diffusion regions include an element diffusion region in which the light-shielding portion is arranged and an element diffusion region in which the light-shielding portion is not arranged.
A lighting device in which at least a part of the light is blocked by the light-shielding portion in the entire element diffusion region in which the light-shielding portion is arranged. The lighting device according to claim 1, wherein the first diffraction optical element has one or a plurality of types of color filters arranged according to the first pattern. The light source unit includes a plurality of light sources that emit light having different wavelengths from each other.
Claim 1 in which the light guide optical system guides the light emitted from each of the plurality of light sources to a region of the first diffractive optical element defined based on the first pattern and the wavelength of the light. The lighting device described in. The lighting device according to any one of claims 1 to 3, wherein the light guide optical system scans the light from the light source unit on the first diffractive optical element. The light guide optical system modulates the spatial distribution of the light from the light source unit according to the first pattern, and guides the modulated light to the first diffractive optical element. The lighting device according to any one of the above. The light guide optical system has a second diffractive optical element that emits the incident light in the first pattern.
The lighting device according to any one of claims 1 to 3, wherein the light emitted from the second diffractive optical element is projected onto the first diffractive optical element in the first pattern. The first diffractive optical element includes a plurality of element diffusion regions.
The lighting device according to any one of claims 1 to 6, wherein the plurality of element diffusion regions emit the light toward the same range as each other in the lighting region. The first diffractive optical element includes a plurality of element diffusion regions.
The lighting device according to any one of claims 1 to 6, wherein the plurality of element diffusion regions emit the light toward different ranges in the lighting region. The lighting device according to any one of claims 1 to 8, wherein the first pattern has the same pattern as the second pattern. The lighting device according to any one of claims 1 to 8, wherein the first pattern has a pattern different from that of the second pattern.

Images