JP2018181545A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which enables lighting and light display in various forms.SOLUTION: A lighting device includes a light source part, a light guide optical system, and a first diffractive optical element 13. The light guide optical system guides light L from the light source part to the first diffractive optical element 13. The first diffractive optical element 13 emits the incident light L in a first pattern P1 (for example, a checker flag pattern). The light L emitted from the first diffractive optical element 13 is projected in a second pattern (for example, a toric pattern) to a lighting area R.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an illumination apparatus using light diffracted by a diffractive optical element as illumination light.

  An illumination device is known which illuminates an area such as a road surface with a desired pattern by combining a light source and a hologram element. For example, according to the illuminating device for vehicles which patent document 1 discloses, information, such as a character, can be projected on a road surface using a laser beam and a hologram.

JP, 2015-132707, A

  As described above, by using coherent light such as laser light in combination with a diffractive optical element such as a hologram element, illumination of a desired pattern can be performed on a relatively wide illumination area, and the observer can It is possible to safely view the desired pattern projected on the screen. Therefore, the illumination apparatus as described above using the coherent light and the diffractive optical element can be applied not only to the vehicle field but also to various field devices.

  On the other hand, the lighting device is required to be further devised to provide various information in various forms. For example, in the field of lighting devices for vehicles, effectively provide information related to traffic etc. to passengers of pedestrians, pedestrians or passengers of other vehicles, and to call attention to each person. Further proposals for possible lighting configurations are desired. In addition to showing excellent illumination performance and information provision performance, the illumination device is also required to perform light display with a good design according to the equipment used and the usage environment.

  The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a lighting device that enables 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 guiding optical system for guiding light from the light source unit to the first diffractive optical element, and the first diffractive optical element is incident The present invention relates to an illumination device that emits light in a first pattern, and the light emitted from a first diffractive optical element is projected in a second pattern on an illumination area.

  The first diffractive optical element may be a light shielding unit disposed in accordance with the first pattern, and may have a light shielding unit that shields 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 emitting light of different wavelengths, and the light guiding optical system is configured to transmit the light emitted from each of the plurality of light sources to a first pattern of the first diffractive optical element and the light It may lead to an area defined based on the wavelength.

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

  The light guiding 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 diffractive optical element.

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

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

  The first diffractive optical element may include a plurality of element diffusion areas, and the plurality of element diffusion areas may emit light to different areas in the illumination area.

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

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

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

FIG. 1 is a view showing a schematic configuration of a lighting device according to the first embodiment. FIG. 2 is a view schematically showing a first pattern of light emitted from the first diffractive optical element and a second pattern of light projected onto the illumination area in the first embodiment. FIG. 3 is a view showing a schematic configuration of a lighting device according to a second embodiment. FIG. 4 is a view schematically showing a first pattern of light emitted from the first diffractive optical element and a second pattern of light projected onto the illumination area in the second embodiment. FIG. 5 is a view showing a schematic configuration of a lighting device according to a third embodiment. FIG. 6 is a view schematically showing a first pattern of light emitted from the first diffractive optical element and a second pattern of light projected onto the illumination area in the third embodiment. FIG. 7 is a view showing a schematic configuration of a lighting device according to a fourth embodiment. FIG. 8 is a view schematically showing a first pattern of light emitted from the first diffractive optical element and a second pattern of light projected onto the illumination area 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, for the sake of illustration and ease of understanding, the scale, vertical and horizontal dimensional ratio, etc. are appropriately changed from those of the real thing. In addition, terms and values specifying shapes, geometric conditions, and their degrees used in the present specification (for example, terms such as "parallel", "orthogonal" and "identical", and values such as length and angle) We will interpret the term including the extent to which the same function can be expected without being bound by a strict meaning.

  Although the illuminating device 10 which concerns on the following each embodiment is assumed to be used as a vehicle light (for example, a headlight and a taillight), the application object and the utilization aspect are not specifically limited. For example, it is possible to apply lighting installation 10 concerning each of the following embodiments also to a lighting installation installed in non-moving bodies, such as mobiles (for example, a ship, a plane, etc.) other than vehicles, and a road. . The illumination device 10 according to each of the following embodiments can also be applied to illumination devices used in applications other than headlights and taillights, for example, illumination devices for general illumination indoors and outdoors, signs The illumination device 10 according to each of the following embodiments can be applied to a light, a floodlight (spotlight), an emergency light, a guide light, and the like.

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

  The illuminating device 10 of this embodiment is provided with the light source part 11, the light guide optical system 12, and the 1st diffractive optical element 13 as shown in FIG.

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

  The light guiding optical system 12 is disposed between the light source unit 11 and the first diffractive optical element 13, shapes the light L from the light source unit 11, and guides the shaped light L to the first diffractive optical element 13. Although the light guide optical system 12 shown in FIG. 1 is configured by the convex lens 12 a and the cylindrical lens 12 b, the specific configuration of the light guide optical system 12 is not particularly limited. That is, the combination of a single type of optical system or a combination of multiple 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 diffractive optical element 13 The light guide optical system 12 can be configured. Therefore, the light guiding optical system 12 may include, for example, a collimating lens, and the collimated light L may be incident on the first diffractive optical element 13.

  Further, in FIG. 1, the light source unit 11, the light guide optical system 12, and the first diffractive optical element 13 are illustrated as being arranged on the same straight line, but in actuality, the arrangement positions of these elements are It is not limited. That is, the light guide optical system 12 may be provided between the light source unit 11 and the first diffractive optical element 13 in the traveling path of the light L, and the light source unit 11 and the first diffractive optical element 13 may not necessarily 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 guiding optical system 12 and the traveling direction of the light L from the light guiding optical system 12 to the first diffractive optical element 13 may be mutually the same. , May be different from each other. When the traveling path of the light L is changed, an optical element such as a mirror which can change the traveling direction of the light L by reflection or the like may be appropriately disposed.

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

  The first diffractive optical element 13 diffracts the light L from the light guiding optical system 12, emits the light L at an angle according to the incident angle, and illuminates the illumination area R with the emitted light L. Although the specific configuration of the first diffractive optical element 13 is not particularly limited, typically, the first diffractive optical element 13 can be configured by a hologram element. When a hologram element is used as the first diffractive optical element 13, it is easy to design the diffraction characteristics, and the first diffractive optical element 13 can relatively easily have a diffraction pattern for illuminating a desired range in the illumination region R. . In addition, one of the other advantages of the hologram element is that the energy density of light L (for example, laser light) from the light source can be reduced by diffusion. In addition, one of the other advantages of the hologram element is that the first diffractive optical element 13 can be used as a directional surface light source, achieving the same illuminance distribution as compared to a lamp light source that functions as a conventional point light source To reduce the brightness on the light source surface to Therefore, by using a hologram element as the first diffractive optical element 13, it is possible to use light with high energy density such as laser light with high safety as light L from the light source unit 11, and the first diffractive optical element Even if the light L having passed through the light source 13 is viewed straight with the human eye, it is less likely to adversely affect the human eye than in the case where the single point light source is viewed directly.

  The method for forming such a diffraction pattern of the first diffractive optical element 13 is not particularly limited. For example, the first diffractive optical element 13 having a desired diffraction pattern is formed by irradiating the hologram photosensitive material with the reference light and the object light, which are coherent light mutually coherent, to form the interference fringes on the hologram photosensitive material. It is possible to make. It is also possible to realize the diffraction pattern of the first diffractive optical element 13 by computer generated hologram (CGH). In this case, the design of interference fringes having arbitrary diffraction characteristics is performed on a computer It can be done and has high convenience.

  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 among the light sources, a specific range of the first diffractive optical element 13 is assigned to each light source, and the incident range of the light L in the first diffractive optical element 13 is It may be different between the light sources. Therefore, when a plurality of types of light L having mutually different wavelength ranges are emitted from the light source unit 11, the light guiding optical system 12 has the range of the first diffractive optical element 13 optimized according to the characteristics of the various light L It is also possible to make multiple types of light L incident on.

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

  The first diffractive optical element 13 of the present embodiment has a light shielding portion 22 arranged according to the first pattern P1. The light blocking portion 22 functions as a mask that blocks at least a part (in the present embodiment, all) of the light L incident from the light guiding optical system 12. Therefore, by using the contrast of the light L formed between the “location where the light shielding portion 22 is disposed” and the “location where the light shielding portion 22 is not disposed” of the first diffractive 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, characters, symbols, etc.) can be displayed on the first diffractive optical element 13. . The first pattern P1 may include one or more unit patterns periodically repeated, or may not include such unit patterns.

  In the first diffractive optical element 13 shown in FIG. 2, the plurality of light shielding portions 22 are arranged in a checkered flag shape, the first pattern P1 is configured by a checkered flag-like pattern, and the first diffractive optical element 13 The light L incident from the optical system 12 is emitted in a checkered flag-like pattern. Therefore, a person who has observed the first diffractive optical element 13 can visually recognize the light L having a checkered flag pattern. Note that FIG. 2 only shows the light shielding portion 22 as an example, and the specific configuration and specific arrangement 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 the light shielding film is attached to a predetermined position (for example, the surface on the light guide optical system 12 side) of the diffractive element corresponding to the first pattern P1. The first diffractive 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 in the illumination region R in the second pattern P2. 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)) , Letters, symbols, etc.) can be projected onto the illumination area R as a second pattern P2. The second pattern P2 may include one or more unit patterns periodically repeated, or may not include such unit patterns. The illumination area R on which the second pattern P2 is projected is an area illuminated by the light L emitted from the first diffractive optical element 13. When the lighting apparatus 10 is mounted on a vehicle, the illumination area R is usually configured by the road surface on which the vehicle travels, and is projected onto the illumination area R by an occupant of the vehicle, a pedestrian, or an occupant of another vehicle. The light L of the second pattern P2 becomes visible.

  The first diffractive optical element 13 shown in FIG. 2 is divided into a plurality of element diffusion areas 21, and each element diffusion area 21 is configured by 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, It may have different shapes and areas.

  In the first diffractive optical element 13 shown in FIG. 2, the light shielding portion 22 is disposed in one of the element diffusion regions 21 arranged adjacently in the vertical and horizontal directions, and the light shielding portion 22 is not disposed in the other. The light L emitted from each of the element diffusion regions 21 in which the light shielding portion 22 is not disposed travels in an angular space determined according to its own diffraction pattern, and illuminates the allocated range of the illumination region R. At this time, the light L from each element diffusion area 21 may illuminate the entire illumination area R or may illuminate only a partial range of the illumination area R. Further, the plurality of element diffusion regions 21 constituting the first diffractive 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, The illumination region R may include two or more element diffusion regions 21 that emit light L to different regions. Therefore, all of the plurality of element diffusion regions 21 constituting the first diffractive optical element 13 may emit the 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 diffractive optical element 13 and the second pattern P2 on the illumination area R Light L can be projected. Thus, in addition to the display of the second pattern P2 in the illumination area R, the display of the first pattern P1 on the first diffractive optical element 13 can be provided to the observer.

  The first diffractive optical element 13 shown in FIG. 2 adopts a checkered flag-like pattern as the first pattern P1 and gives a new design to the vehicle on which it is mounted. By adopting it as P1, it is also possible to provide the vehicle with another design with excellent designability. Further, by adopting a pattern indicating specific information (for example, information related to traffic etc.) as the first pattern P1 and arranging the light shielding portion 22 according to such a first pattern P1, the first diffractive optical element 13 can It is possible to provide each person with that specific information and to call attention.

  In the illumination device 10 shown in FIG. 2, the light display pattern (that is, the first pattern) on the first diffractive optical element 13 is different from the projection pattern of the light L (that is, the second pattern) in the illumination area R However, the configuration of these first and second patterns 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 blocking portion 22 blocks all of the light L incident from the first diffractive optical element 13 to the light blocking portion 22 has been described, but the light blocking portion 22 is from the first diffractive optical element 13 to the light blocking portion Only a part of the light L incident on 22 may be blocked. For example, each light blocking portion 22 may create contrast of the light L by blocking only a part of the light L incident on the light blocking portion 22 over substantially the entire wavelength range. The first diffractive optical element 13 may have one or more types of color filters arranged according to the first pattern P1 as the light shielding portion 22. Each light shielding portion 22 is incident on the light shielding portion 22. It is also possible to block only a specific wavelength range component of the extracted light L. In this case, it is possible to display the first pattern P1 of a chromatic color according to the color filter on the first diffractive optical element 13. In particular, it is possible to display the first pattern P1 in a plurality of colors on the first diffractive optical element 13 by arranging a plurality of types of color filters that block mutually different wavelength regions as the light shielding portion 22. .

Second Embodiment
In the present embodiment, elements that are the same as or similar to those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.

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

  In the illumination device 10 according to the present embodiment, as shown in FIG. 3, in addition to the light source unit 11 and the first diffractive optical element 13, the scanning device 15 is provided as a light guiding optical system 12. A control device 16 is connected to 15.

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

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

  The control device 16 controls the light source unit 11 and the scanning device 15 and adjusts the on / off of the light emission of the light L by the light source unit 11 (that is, light emission and non-emission). It can be adjusted. By controlling the 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 made to enter only the desired part on the first diffractive optical element 13. On the other hand, the light L can be prevented from entering the other part.

  For example, in the case where the light source unit 11 includes a plurality of light sources emitting light in different wavelength ranges, the scanning device 15 under the control of the controller 16 controls the light L emitted from each of the plurality of light sources as a first diffractive optical element It is possible to lead to the area | region determined based on the wavelength of 1st pattern P1 and the light L among S13. Therefore, while light L from only one specific light source of the plurality of light sources is made to enter a certain range of the first diffractive optical element 13, a plurality of light sources are made to the other range of the first diffractive optical element 13. It is also possible to make the light L from two or more light sources of the light source Thereby, the first pattern P1 can be configured with various colors, and an arbitrary pattern (for example, a pattern like a French flag) having various colors and patterns is set as the first pattern P1 as the first diffractive optical element It can be displayed on 13.

  The other configuration is the same as that of the lighting device 10 of the first embodiment described above.

  According to the illumination device 10 of the present embodiment, the light L is incident on a 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 It can be done. Thereby, the light display of the first pattern P1 can be performed on the first diffractive optical element 13 in various forms.

  In particular, when the light source unit 11 includes a plurality of light sources, light display of various first patterns P1 having various colors and patterns can be performed on the first diffractive optical element 13. Therefore, various designs can be added to the mounted vehicle, and optical display can be performed on the first diffractive optical element 13 which can more effectively alert the viewer.

  In addition, although the case where ON and OFF of light emission of the light source part 11 were controlled by the above-mentioned was demonstrated, the presence or absence of the incident of the light L to the scanning apparatus 15 may be controlled by another method. For example, by installing a shutter (not shown) between the light source unit 11 and the scanning device 15 and controlling the opening and closing of the shutter by the control device 16, 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, elements that are the same as or similar to those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.

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

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

  The light L from the light source unit 11 is incident on the convex lens 12a, the diameter of the light L (that is, the beam diameter) is enlarged, and the light L is emitted toward the collimator lens 12c. The collimator lens 12c receives the light L from the convex lens 12a, collimates the light L, and emits the light L toward the spatial light modulator 18.

  The spatial light modulator 18 receives the light L from the collimator lens 12c, modulates the spatial distribution of the light L according to the first pattern P1, and directs the light L toward the first diffractive optical element 13 I will 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 micro mirror reflection type panel (DMD: Digital Mirror Device), a LCOS (Liquid Crystal On Silicon) display system, a shutter, an aperture, or a light blocking patterned reflecting mirror, etc. The spatial light modulator 18 can be configured.

  The convex lens 12 a and the collimator lens 12 c shape the light L from the light source unit 11 and guide the light L to the incident area 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 applies the light L to the first diffractive optical element 13 in the first pattern P1. Let it strike. Thereby, the first diffractive 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 converted to the first diffractive optical element 13 Lead to

  When the light source unit 11 includes a plurality of light sources, the light guiding optical system 12 may be provided for each light source, and the spatial light modulation device 18 provided for each light source is optimized for the corresponding light source. It may be Therefore, when a plurality of types of light L having mutually different wavelength ranges are emitted from the light source unit 11, the spatial light modulator 18 provided for each light source makes the spatial distribution different from each other among the types of light L. It is also good, and may be the same.

  The other configuration is the same as that of the lighting device 10 of the first embodiment described above.

  According to the illumination device 10 of the present embodiment, the spatial light modulation device 18 can adjust the spatial distribution of the light L irradiated to the first diffractive optical element 13, so that the light incidence of the first diffractive optical element 13 The light L can be directed to any part of the area. Thereby, the light display of the first pattern P1 can be performed on the first diffractive optical element 13 in various forms.

  In particular, when the spatial modulation of the light L by the spatial light modulator 18 can be controlled by a controller (not shown), the irradiation pattern of the light L onto the first diffractive optical element 13 and the light L from the first diffractive optical element 13 Of the light emission pattern (ie, the first pattern P1) can be changed dynamically. In this case, the second pattern P2 of the light L in the illumination area 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 first diffractive optical element 13, it is possible to change the second pattern P2 in accordance with the change of the first pattern P1. On the other hand, the first pattern P1 is designed by designing the diffraction pattern of the first diffractive 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. It is possible not to change the second pattern P2 regardless of the change of.

Fourth Embodiment
In the present embodiment, elements that are the same as or similar to those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.

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

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

  The light L from the light source unit 11 is incident on the convex lens 12a, the diameter of the light L is enlarged, and the light L is emitted toward the collimator lens 12c. The collimating lens 12 c receives the light L from the convex lens 12 a, collimates the light L, and emits the light L toward the second diffractive optical element 19.

  The second diffractive optical element 19 diffracts the light L from the collimator lens 12c, and emits the incident light L in a first pattern P1. Although the specific configuration of the second diffractive optical element 19 is not particularly limited, 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 collimated by the collimator lens 12 d and then projected onto the first diffractive optical element 13 in a first pattern P1.

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

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

  The other configuration is the same as that of the lighting device 10 of the first embodiment described above.

  According to the illumination 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 is converted to the first diffractive optical element 13 by devising the diffraction pattern of the second diffractive optical element 19 It can be made to be incident accurately. Thereby, light display of the first pattern P1 on the first diffractive optical element 13 can be performed in various forms, and visibility of the light display of the first pattern P1 on the first diffractive optical element 13 We can expect improvement.

  Further, by using two diffractive optical elements (ie, 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 the light shielding portion. The light L of the desired second pattern P2 can be projected onto the illumination area R. Therefore, the light L emitted from the light source unit 11 can be efficiently used, and the second pattern projected on the light L of the first pattern P1 emitted from the first diffractive optical element 13 and the illumination area R Both of the light L of P2 can be brightened.

  While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the present invention by the embodiments described above. In the above-mentioned embodiment and other embodiments, it is possible to omit, replace, and change some elements without departing from the scope of the invention. The embodiments described above, other embodiments and various modifications are included in the scope and the gist of the present invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Illuminating device, 11 ... Light source part, 11R ... R light source, 11G ... G light source, 11B ... B light source, 12 ... Light guide optical system, 12a ... Convex lens, 12b ... Cylindrical lens, 12c ... Collimation lens, 12d ... Collimation lens , 13: first diffractive optical element, 15: scanning device, 16: controller, 18: spatial light modulator, 19: second diffractive optical element, 21: element diffusion area, 22: light shielding portion, L: light, P1 ... first pattern, P2 ... second pattern, R ... illumination area

Claims (11)

A light source unit,
A first diffractive optical element,
A light guiding optical system for guiding the light from the light source unit to the first diffractive optical element;
The first diffractive optical element emits the incident light in a first pattern,
An illumination device in which the light emitted from the first diffractive optical element is projected in a second pattern onto an illumination area.   The lighting device according to claim 1, wherein the first diffractive optical element is a light shielding unit disposed in accordance with the first pattern, and includes a light shielding unit that shields at least a part of the light.   The lighting device according to claim 1, wherein the first diffractive optical element includes one or more types of color filters arranged according to the first pattern. The light source unit includes a plurality of light sources emitting light of different wavelengths,
The light guiding optical system guides the light emitted from each of the plurality of light sources to a region of the first diffractive optical element, which is determined based on the first pattern and the wavelength of the light. Or the illuminating device as described in 2.   The lighting apparatus according to any one of claims 1 to 4, wherein the light guiding optical system causes the light from the light source unit to scan on the first diffractive optical element.   The light guiding 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. A lighting device according to any one of the preceding claims. The light guiding optical system includes 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 4, wherein the light emitted from the second diffractive optical element is projected on the first diffractive optical element in the first pattern. The first diffractive optical element includes a plurality of element diffusion regions,
The illumination device according to any one of claims 1 to 7, wherein the plurality of element diffusion regions emit the light toward the same range in the illumination region. The first diffractive optical element includes a plurality of element diffusion regions,
The lighting device according to any one of claims 1 to 7, wherein the plurality of element diffusion regions emit the light to different ranges in the illumination region.   The lighting device according to any one of claims 1 to 9, wherein the first pattern has the same pattern as the second pattern.   The lighting device according to any one of claims 1 to 9, wherein the first pattern has a pattern different from the second pattern.