Lighting device

Abstract

An illumination device (101) is provided with a light source (1) and an optical element (2) comprising a crystalline or amorphous solid. The optical element has an incident surface (21) on which the light emitted from the light source is incident, and an exit surface (22) on which the light incident from the incident surface is emitted toward the irradiation surface. When viewed from the optical axis direction of the light source, the light source is disposed further inward than the outer peripheral edges of the incident surface and the exit surface of the optical element. The optical element is provided so as to refract light incident from the incident surface, and to emit light having a non-uniform intensity distribution from the emission surface to the irradiation surface.

Description

Technical Field

[0001] This disclosure relates to lighting fixtures. Background Technology

[0002] Japanese Patent Application Publication No. 2012-146559 (Patent Document 1) discloses an illumination device that causes the surface of a translucent liquid to ripple within a hollow panel positioned in front of the light-emitting direction of the light source, illuminating the light passing through the liquid surface as rippled light. The illumination device is configured to cause the liquid surface to ripple by circulating the liquid between a liquid circulation member, which is separately disposed outside the hollow panel, and the hollow panel.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-146559 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in the lighting device described in Patent Document 1, a liquid circulation component is necessary, and its structure is complex.

[0008] The main objective of this disclosure is to provide a lighting device with a relatively simple structure and capable of illuminating light with a non-uniform intensity distribution.

[0009] Methods for solving problems

[0010] The illumination device disclosed herein includes a light source and at least one optical element made of a crystalline or amorphous solid. The at least one optical element has an incident surface on which light incident from the light source is incident and an exit surface on which light incident from the incident surface is emitted toward an illumination surface. When viewed from the optical axis of the light source, the light source is positioned inside the outer periphery of both the incident and exit surfaces of the at least one optical element. The at least one optical element is configured to refract light incident from the incident surface and emit light with a non-uniform intensity distribution from the exit surface to the illumination surface.

[0011] The effects of the invention

[0012] According to the present invention, a lighting device is provided that has a relatively simple structure and is capable of illuminating light with a non-uniform intensity distribution. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view used to illustrate the lighting device of Embodiment 1.

[0014] Figure 2yes Figure 1 Front view of the optical elements of the lighting device shown.

[0015] Figure 3 yes Figure 1 A side view of the optical elements of the lighting device shown.

[0016] Figure 4 Viewed from the exit surface side Figure 1 A three-dimensional view of the optical elements of the lighting device shown.

[0017] Figure 5 This is a cross-sectional view used to illustrate a modified example of the lighting device of Embodiment 1.

[0018] Figure 6 This is a cross-sectional view used to illustrate the lighting device of Embodiment 2.

[0019] Figure 7 This is a cross-sectional view used to illustrate a modified example of the lighting device in Embodiment 2.

[0020] Figure 8 This is a cross-sectional view used to illustrate the lighting device of Embodiment 3.

[0021] Figure 9 This is a cross-sectional view used to illustrate a modified example of the lighting device in Embodiment 3.

[0022] Figure 10 This is a cross-sectional view used to illustrate a modified example of the lighting device in Embodiment 3. Detailed Implementation

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that in the following drawings, the same or equivalent parts will be labeled with the same reference numerals, and will not be described repeatedly. Furthermore, in each drawing, the structure is shown schematically and is not intended to represent actual dimensions.

[0024] Implementation method 1.

[0025] The lighting device 101 of Embodiment 1 is a device for irradiating a surface 200 with light having a non-uniform intensity distribution. In this specification, light with a non-uniform intensity distribution refers to light whose intensity distribution is not symmetrical. The lighting device 101 is configured, for example, to emit light with an intensity distribution that is not rotationally symmetrical towards the surface. It should be noted that the surface 200 can be any surface outside the lighting device 101 located in the direction of light emission. For example, if the lighting device 101 is installed on the ceiling or wall in a living room, it can also be a floor surface, wall surface, table surface, etc.

[0026] like Figure 1As shown, the lighting device 101 of Embodiment 1 mainly includes a light source 1 and an optical element 2.

[0027] Light source 1 can be any light source that emits visible light. Light source 1 can be a light source that emits light in a specific wavelength region within the visible light wavelength range, or it can be a light source capable of emitting white light. Light source 1 may include, for example, a light-emitting element such as an LED (Light-Emitting Diode) or a laser. Light source 1 may also include a light-emitting element and a phosphor, the phosphor having a peak emission wavelength in a wavelength region complementary to the emission wavelength region of the light-emitting element. Light source 1 may also include an LED or laser emitting light in the blue wavelength region, and a phosphor excited by a portion of the light emitted from the light-emitting element, having a peak emission wavelength in the yellow wavelength region complementary to blue. Light source 1 can also be configured to change the color (wavelength region) of the emitted light.

[0028] The light source 1 is configured to emit light with a symmetrical intensity distribution toward the incident surface 21 of the optical element 2, described later. The light emitted from the light source 1 has an intensity distribution that decreases in intensity, for example, as it moves away from the optical axis. Such an intensity distribution has rotational symmetry about the optical axis.

[0029] like Figures 1-4 As shown, optical element 2 is made of a crystalline or amorphous solid. Optical element 2 has an incident surface 21 where light emitted from light source 1 enters and an exit surface 22 where light incident from incident surface 21 exits towards irradiation surface 200. When viewed from the optical axis direction A of light source 1, light source 1 is positioned inside the outer periphery of both incident surface 21 and exit surface 22 of optical element 2. When viewed from the optical axis direction A of light source 1, the minimum width of optical element 2 is wider than the maximum width of light source 1.

[0030] Optical element 2 is configured to refract light incident from incident surface 21 and emit light with a non-uniform intensity distribution from exit surface 22 toward irradiation surface 200. Optical element 2 is configured, for example, to emit light with an intensity distribution that does not have rotational symmetry toward irradiation surface 200.

[0031] Figures 2-4 These are front views, side views, and perspective views showing an example of optical element 2. For example... Figures 1-4 As shown, at least one of the incident surface 21 and the exit surface 22 of the optical element 2 is a freeform surface. In this specification, a freeform surface refers to a surface that is at least not rotationally symmetric. At least one of the incident surface 21 and the exit surface 22 does not have an axis of rotational symmetry, either in-plane or out-of-plane. Preferably, at least one of the incident surface 21 and the exit surface 22 of the optical element 2 also does not have line symmetry.

[0032] exist Figures 1-4 In the optical element 2 shown, the incident surface 21 is a plane, and the exit surface 22 is a freeform surface. It should be noted that, alternatively, the incident surface 21 can be a freeform surface, and the exit surface 22 can be a plane. Furthermore, both the incident surface 21 and the exit surface 22 can be freeform surfaces. The incident surface 21 only needs to intersect the optical axis of the light source 1. The incident surface 21 can also be orthogonal to the optical axis of the light source 1.

[0033] The material constituting the optical element 2 can be any material, as long as it allows light emitted from the light source 1 to pass through and its refractive index differs from that of the medium (e.g., air) surrounding the optical element 2. Preferably, the material constituting the optical element 2 comprises an amorphous material. The material constituting the optical element 2 may include, for example, amorphous resin materials represented by acrylic acid or polycarbonate, or amorphous solids such as glass.

[0034] Between the light source 1 and the incident surface 21 of the optical element 2, there is a medium that is transparent to the light emitted from the light source 1 and has a different refractive index than the material constituting the optical element 2. Such a medium is, for example, air.

[0035] The distance (irradiation distance) between the incident surface 21 of the light source 1 and the optical element 2 can, for example, be longer than the distance (thickness) between the incident surface 21 and the exit surface 22 of the optical element 2.

[0036] The lighting device 101 may also include a housing 3 that internally houses the light source 1 and the optical element 2. In this case, the light source 1 and the optical element 2 are fixed to the housing 3. The housing 3 has a portion through which light emitted from the exit surface 22 of the optical element 2 passes. Preferably, inside the housing 3, in the area overlapping with the optical element 2 when viewed from the optical axis of the light source 1, no reflective member is provided to reflect light emitted from the light source 1. More specifically, inside the housing 3, in the area overlapping with the optical element 2 when viewed from the optical axis of the light source 1 and at a position rearward of the light source 1 (opposite to the optical element 2 relative to the light source 1), no reflective member is provided to reflect light reflected from the incident surface 21 of the optical element 2. It should be noted that the lighting device 101 may also be without a housing 3. The light source 1 and the optical element 2 may also be fixed to the ceiling or wall, etc., where the lighting device 101 is installed. In this case, with the lighting device 101 installed, in the area overlapping with the optical element 2 when viewed from the optical axis of the light source 1, no reflective member is provided to reflect light emitted from the light source 1. Preferably, no reflective component is disposed at a position behind the light source 1.

[0037] <Effect>

[0038] The lighting device 101 refracts light emitted from the light source 1 through an optical element 2 made of a crystalline or amorphous solid without using a liquid, enabling it to emit light with a non-uniform intensity distribution onto the illumination surface 200. Since the lighting device 101 does not require a liquid circulation component, its structure is simpler than conventional lighting devices that include a liquid circulation component. That is, the lighting device 101 has a relatively simple structure and can form an illumination pattern on the illumination surface 200 composed of light with a non-uniform intensity distribution. The spatial rendering effect of such a lighting device 101 is superior to that of lighting devices that can only illuminate light with a symmetrical intensity distribution.

[0039] In the lighting device 101, the light source 1 can also be configured to emit light with rotational symmetry in intensity distribution toward the incident surface 21. From a different perspective, the light source 1 can also be configured to emit light with an intensity distribution that decreases as the intensity moves away from the optical axis. In this case, the optical element 2 is preferably configured to emit light with an intensity distribution that does not have rotational symmetry toward the irradiation surface 200. Such a lighting device 101 has a readily available light source 1 and is capable of irradiating light with a non-uniform intensity distribution. More preferably, the optical element 2 is configured to emit light with an intensity distribution that has both rotational and linear symmetry toward the irradiation surface 200. According to such a lighting device 101, light with high non-uniformity in intensity distribution can be irradiated.

[0040] In the lighting device 101, inside the housing 3, in the area overlapping with the optical element 2 when viewed from the optical axis of the light source 1, no reflective component is provided to reflect light emitted from the light source 1. More specifically, inside the housing 3, in the area overlapping with the optical element 2 when viewed from the optical axis of the light source 1 and at a position rearward of the light source 1 (opposite to the optical element 2 relative to the light source 1), no reflective component is provided to reflect light reflected by the incident surface 21 of the optical element 2.

[0041] Assuming the reflective component is positioned inside the housing 3 in the area overlapping with the optical element 2 when viewed from the optical axis of the light source 1, and further back than the light source 1 (on the side opposite to the optical element 2 relative to the light source 1), noise caused by stray light is easily generated in the region near the optical axis. For example, when the reflective surface of the reflective component is parallel to the incident surface 21 of the optical element 2, light incident at a small angle of incidence (e.g., less than 45 degrees) relative to the incident surface 21 of the optical element 2 will easily become stray light again because the reflection angles of both the incident surface 21 and the reflective surface of the reflective component are equally smaller. On the other hand, light incident at a large angle of incidence (e.g., greater than 45 degrees) relative to the incident surface 21 of the optical element 2 will not easily be absorbed or blocked by the housing 3 because the reflection angles of both the incident surface 21 and the reflective surface of the reflective component are equally larger. As a result, noise caused by stray light is more likely to occur in the area near the optical axis compared to the area far from the optical axis, thus reducing the quality of the lighting device.

[0042] In contrast, the lighting device 101 does not have a reflective component that is the main cause of stray light generation. Therefore, even in the region near the optical axis, it is difficult to generate noise caused by stray light in the lighting device 101, and the degradation of quality can be suppressed.

[0043] In the lighting device 101, at least one of the incident surface 21 and the exit surface 22 of the optical element 2 is a freeform surface. The light refracted by such an optical element 2 and emitted from the exit surface 22 has a non-uniform intensity distribution.

[0044] In the lighting device 101, it is preferable that the material constituting the optical element 2 is an amorphous material. Amorphous materials have lower molding shrinkage compared to crystalline materials. Therefore, if the material constituting the optical element 2 is an amorphous material, the optical element 2 can be formed more easily using a mold. Furthermore, amorphous materials have higher transparency compared to crystalline materials. Therefore, if the material constituting the optical element 2 is an amorphous material, the light utilization efficiency of the lighting device 101 can be improved.

[0045] <Variation Example>

[0046] The lighting device 101 can be modified as follows.

[0047] Light source 1 can also be configured to emit light with a uniform intensity distribution independent of the distance from the optical axis. Alternatively, light source 1 can be configured to emit light with an asymmetric intensity distribution. In the former case, optical element 2 can also refract the light incident from incident surface 21 and emit light with a non-uniform intensity distribution from exit surface 22 to illumination surface 200. In the latter case, optical element 2 can emit light from exit surface 22 to illumination surface 200 with increased non-uniformity of intensity distribution compared to the light incident from incident surface 21.

[0048] The optical element 2 can have any structure as long as it can emit light with a non-uniform intensity distribution from the exit surface 22 to the irradiation surface 200. At least one of the incident surface 21 and the exit surface 22 of the optical element 2 does not have to be a freeform surface. For example, in at least one of the incident surface 21 and the exit surface 22, the surface roughness, color intensity, etc., can also be formed in a non-uniform distribution within the surface.

[0049] The lighting device 101 may also have multiple light sources 1. The multiple light sources 1 may also be arranged side by side in a direction orthogonal to the optical axis.

[0050] like Figure 5 As shown, the illumination device 101 may also include multiple optical elements 2. These multiple optical elements 2 may also include a first optical element 2A and a second optical element 2B arranged side-by-side in the optical axis direction. The incident surface 21B of the second optical element 2B is arranged facing the exit surface 22A of the first optical element 2A. For example, at least one of the incident surfaces 21A, 21B and exit surfaces 22A, 22B of each of the first optical element 2A and the second optical element 2B is a freeform surface. The exit surface 22A of the first optical element 2A and the incident surface 21B of the second optical element 2B may also be freeform surfaces. Light passing through each of such first optical elements 2A and second optical elements 2B and emitted from the exit surface of the second optical element 2B also has a non-uniform intensity distribution on the illumination surface 200.

[0051] Implementation method 2.

[0052] Unless otherwise specified, the lighting device 102 of Embodiment 2 has the same structure and effect as the lighting device 101 of Embodiment 1.

[0053] like Figure 6 As shown, the lighting device 102 also includes a rotating part 4 that rotates the optical element 2 relative to the light source 1. The rotating part 4 can also change the rotation period of the optical element 2. The rotation axis of the optical element 2 is, for example, arranged coaxially with the optical axis of the light source 1. It should be noted that the rotation axis of the optical element 2 may not be arranged coaxially with the optical axis of the light source 1.

[0054] The rotating part 4 can have any structure as long as it can rotate the optical element 2. The rotating part 4 includes, for example, a motor and a belt. The belt is mounted on the rotating shaft of the motor and the outer peripheral end face of the optical element 2, and is configured to transmit the rotational force of the motor to the optical element 2.

[0055] According to the lighting device 102, an illumination pattern consisting of light with a non-uniform intensity distribution can be formed on the illumination surface 200, and the illumination pattern can be made to change over time. That is, the lighting device 102 can cause the illumination pattern to fluctuate. The spatial rendering effect of such a lighting device 102 is higher than that of the lighting device 101.

[0056] Preferably, the rotating part 4 is configured to give the rotation period of the optical element 2 a characteristic of 1 / f fluctuation. In other words, the rotating part 4 controls the rotation period of the optical element 2 such that the power spectral density associated with the rotation period of the optical element 2 is inversely proportional to the frequency.

[0057] Such a lighting device 102, by controlling the rotation period of the optical element 2 as described above by the rotating part 4, can generate 1 / f fluctuations in the aforementioned lighting pattern. 1 / f fluctuations are found in various natural phenomena where physical quantities change over time, but are generally considered to bring comfort or relaxation. According to the lighting device 102, it has a relatively simple structure and can bring comfort or relaxation to people who visually recognize the lighting pattern.

[0058] <Variation Example>

[0059] The lighting device 102 can be modified as follows.

[0060] like Figure 7 As shown, lighting device 102 and Figure 5 Similarly, the lighting device 101 shown may also include a first optical element 2A and a second optical element 2B. Figure 7 The first optical element 2A and the second optical element 2B shown have the same... Figure 5 The first optical element 2A and the second optical element 2B shown have the same structure.

[0061] The rotating part 4 rotates one of the first optical element 2A and the second optical element 2B relative to the other. For example, the rotating part 4 may also rotate only one of the first optical element 2A and the second optical element 2B. The rotating part 4 may also rotate each of the first optical element 2A and the second optical element 2B in a manner where their respective rotation periods or variations in rotation periods are different. Alternatively, the rotating part 4 may be able to switch between a state where only one of the first optical element 2A and the second optical element 2B rotates and a state where each of the first optical element 2A and the second optical element 2B rotates in a manner where their respective rotation periods or variations in rotation periods are different. When the first optical element 2A and the second optical element 2B rotate separately, the rotation axis of the first optical element 2A may or may not be coaxial with the rotation axis of the second optical element 2B.

[0062] Such a lighting device 102 also has a relatively simple structure and can bring comfort or relaxation to people who visually recognize lighting patterns.

[0063] Implementation method 3.

[0064] Unless otherwise specified, the lighting device 103 of Embodiment 3 has the same structure and effect as the lighting device 101 of Embodiment 1.

[0065] like Figure 8 As shown, the lighting device 103 also includes a light quantity control unit 5 that controls the amount of light emitted from the light source 1. The light quantity control unit 5 causes the variation of the amount of light emitted from the light source 1 to change periodically.

[0066] The light quantity control unit 5 can have any structure as long as it can control the amount of light emitted from the light source 1. For example, the light quantity control unit 5 includes a driver for outputting DC voltage and a pulse width modulation (PWM) control circuit, and is configured such that the PWM control circuit controls the duty cycle of the DC voltage output from the driver.

[0067] According to the lighting device 103, an illumination pattern consisting of light with a non-uniform intensity distribution can be formed on the illumination surface 200, and the illumination pattern can be made to change over time. That is, the lighting device 103 can make the illumination pattern fluctuate. The spatial rendering effect of such a lighting device 103 is higher than that of the lighting device 101.

[0068] Preferably, the light intensity control unit 5 is configured to have a light intensity that fluctuates by 1 / f. In other words, the light intensity control unit 5 controls the light intensity emitted from the light source 1 such that the power spectral density, which is related to the light intensity emitted from the light source 1, is inversely proportional to the frequency.

[0069] Such a lighting device 103, by controlling the variation period of the light quantity emitted from the light source 1 as described above by the light quantity control unit 5, can cause the aforementioned lighting pattern to fluctuate by 1 / f. According to the lighting device 103, it has a relatively simple structure and can bring comfort or relaxation to people who visually recognize the lighting pattern.

[0070] <Variation Example>

[0071] The lighting device 103 can be modified as follows.

[0072] like Figure 9 As shown, the lighting device 103, like the lighting device 102, may also include a rotating part 4. This lighting device 103 can not only change the periodic variation of the light intensity emitted from the light source 1 via the light intensity control part 5, but also change the rotation period of the optical element 2 via the rotating part 4. Preferably, the rotating part 4 and the light intensity control part 5 can control the light source 1 and the rotating element 2, so that the change in the rotation period of the optical element 2 is synchronized with the change in the periodic variation of the light intensity emitted from the light source 1. For example, when the rotation speed of the optical element 2 increases and the rotation period of the optical element 2 decreases, the rotating part 4 and the light intensity control part 5 can control the light source 1 and the rotating element 2, thereby increasing the light intensity emitted from the light source 1. More preferably, the rotating part 4 is configured to have a 1 / f fluctuation characteristic in the rotation period of the optical element 2, and the light intensity control part 5 is configured to have a 1 / f fluctuation characteristic in the light intensity emitted from the light source 1. In this case, it is also preferable that the rotating part 4 and the light quantity control part 5 can control the light source 1 and the rotating element 2 so that the operation of the rotation period of the optical element 2 is synchronized with the operation of the operation of the change period of the light quantity emitted from the light source 1.

[0073] Lighting device 103 and Figure 5 Similarly, the lighting device 101 shown may also include a first optical element 2A and a second optical element 2B.

[0074] like Figure 10 As shown, the lighting device 103 may also include multiple light sources 1. The multiple light sources 1 may include a first light source 1A and a second light source 1B. The first light source 1A and the second light source 1B are arranged side-by-side in a direction orthogonal to the optical axis direction A1 of the first light source 1A. When viewed from the optical axis direction A1 of the first light source 1A, the first light source 1A and the second light source 1B are positioned inside the outer periphery of the incident surface 21 and the exit surface 22 of the optical element 2. The optical axis direction A1 of the first light source 1A may be parallel to or intersect the optical axis direction A2 of the second light source 1B.

[0075] The light quantity control unit 5 changes the variation period of the light quantity emitted from at least one of the first light source 1A and the second light source 1B. For example, the light quantity control unit 5 may also change the variation period of the light quantity emitted from only one of the first light source 1A and the second light source 1B. The light quantity control unit 5 may also change the amount of variation of the variation period of the light quantity emitted from the first light source 1A and the second light source 1B in different ways. Alternatively, the light quantity control unit 5 may be configured to switch between a state in which the variation period of the light quantity emitted from only one of the first light source 1A and the second light source 1B is changed and a state in which the amount of variation of the variation period of the light quantity emitted from the first light source 1A and the second light source 1B is changed in different ways.

[0076] Such a lighting device 103 also has a relatively simple structure and can bring comfort or relaxation to people who visually recognize lighting patterns.

[0077] The above embodiments can be appropriately modified or omitted. Furthermore, the above embodiments can be modified in various ways during implementation without departing from their essential points. Additionally, the inventions encompassing various stages in the above embodiments can be derived from appropriate combinations of the disclosed structural elements.

[0078] Explanation of reference numerals in the attached figures

[0079] 1 Light source, 1A First light source, 1B Second light source, 2 Optical element, 2A First optical element, 2B Second optical element, 3 Housing, 4 Rotating part, 5 Light quantity control part, 21 Incident surface, 22 Exit surface, 101, 102, 103 Illumination device.

Claims

1. A lighting device, wherein, The lighting device includes: light source; as well as At least one optical element made of a crystalline or amorphous solid. The at least one optical element has an incident surface on which light emitted from the light source enters and an exit surface on which light incident from the incident surface exits toward the irradiation surface. When viewed from the optical axis direction of the light source, the light source is positioned inside the outer periphery of both the incident surface and the exit surface of the at least one optical element. The at least one optical element is configured to refract light incident from the incident surface and emit light with a non-uniform intensity distribution from the exiting surface to the irradiated surface.

2. The lighting device as claimed in claim 1, wherein, The at least one optical element is configured to emit light toward the irradiation surface whose intensity distribution does not have rotational symmetry.

3. The lighting device as described in claim 1 or 2, wherein, The lighting device also includes a housing that internally houses the light source and the at least one optical element. Inside the housing, in the area overlapping with the at least one optical element when viewed from the optical axis of the light source, no reflective element is provided to reflect light emitted from the light source.

4. The lighting device according to any one of claims 1 to 3, wherein, At least one of the incident surface and the exit surface is a freeform surface.

5. The lighting device according to any one of claims 1 to 4, wherein, The lighting device also includes a rotating part that rotates the at least one optical element relative to the light source.

6. The lighting device as claimed in claim 5, wherein, The rotating part causes the rotation period of the at least one optical element to change.

7. The lighting device as claimed in claim 6, wherein, The rotating part is configured to give the rotation period of the at least one optical element a characteristic of 1 / f fluctuation.

8. The lighting device as described in any one of claims 5 to 7, wherein, The at least one optical element includes a first optical element and a second optical element arranged side by side along the optical axis. The incident surface of the second optical element is arranged facing the exit surface of the first optical element. The rotating part causes one of the first optical element and the second optical element to rotate relative to the other.

9. The lighting device as claimed in any one of claims 1 to 8, wherein, The lighting device also includes a light quantity control unit that controls the amount of light emitted from the light source. The light quantity control unit causes the periodic variation of the light quantity emitted from the light source to change.

10. The lighting device as claimed in claim 9, wherein, The light quantity control unit is configured to give the light quantity emitted from the light source a characteristic of 1 / f fluctuation.

11. The lighting device as claimed in claim 9 or 10, wherein, The light source includes a first light source and a second light source. When viewed from the optical axis direction of the first light source, the first light source and the second light source are positioned inside the outer periphery of the incident surface and the exit surface of the at least one optical element. The light quantity control unit controls the light emitted from at least one of the first light source and the second light source.

12. The lighting device according to any one of claims 1 to 11, wherein, The material constituting the at least one optical element comprises an amorphous resin material.

13. The lighting device according to any one of claims 1 to 12, wherein, The light source is capable of emitting white light.

14. The lighting device according to any one of claims 1 to 13, wherein, The light source can change the wavelength range of the emitted light.

Images