Light-emitting device, and illumination device

Abstract

To provide a light-emitting device capable of easily checking the intensity of UV rays.SOLUTION: A light-emitting device 11 includes: a first light source 41 that emits ultraviolet light; and a second light source 51 that emits visible light. In the light-emitting device 11, the first light source 41 and the second light source 51 are connected in parallel or series. The light-emitting device 11 is configured so that the greater the maximum irradiance of ultraviolet light emitted by the first light source 41 in an area 20 cm from the light-emitting device 11, the higher the maximum luminance of visible light emitted by the second light source 51.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a light-emitting device and a lighting device, and more particularly to a light-emitting device including a light source that emits ultraviolet light and a lighting device including the light-emitting device.

Background Art

[0002] Conventionally, for example, a light-emitting device that emits ultraviolet light has been used for purposes such as attracting insects and sterilization.

[0003] Since ultraviolet light is invisible to the human eye, it is often difficult to confirm whether ultraviolet light is being emitted in a light-emitting device that uses an ultraviolet light source that does not emit visible light or emits weak visible light. Therefore, for example, in the technique disclosed in Patent Document 1, when the ultraviolet irradiation device emits ultraviolet light, it is configured to emit visible light by a phosphor or a visible light-emitting element.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a light-emitting device that emits ultraviolet light, if the intensity of the emitted ultraviolet light can be confirmed, it is possible to prevent a person from being affected without noticing the ultraviolet light with a high intensity. However, in a light-emitting device that uses an ultraviolet light source that does not emit visible light or emits weak visible light, it is often difficult to confirm the intensity of the ultraviolet light.

[0006] The present disclosure has been made in view of the above problems, and an object thereof is to provide a light-emitting device and a lighting device capable of easily confirming the intensity of ultraviolet light.

Means for Solving the Problems

[0007] A light-emitting device according to an aspect of the present disclosure includes a first light source that emits ultraviolet light and a second light source that emits visible light. In the light-emitting device, the first light source and the second light source are connected in parallel or in series. In the light-emitting device, the greater the maximum irradiance of the ultraviolet light emitted by the first light source in a region 20 cm from the light-emitting device, the higher the maximum luminance of the visible light emitted by the second light source.

[0008] A lighting device according to an aspect of the present disclosure includes the light-emitting device and a lighting device that lights the light-emitting device.

Advantages of the Invention

[0009] According to the light-emitting device and the lighting device according to an aspect of the present disclosure, the intensity of ultraviolet light can be easily confirmed.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0011] ≪Embodiment≫ Hereinafter, a light-emitting device and a lighting device according to an aspect of the present disclosure will be described with reference to the drawings.

[0012] <Configuration> 1. Overview of the Lighting Device FIG. 1A is a front view of the lighting device 1 according to the embodiment. FIG. 1B is a side view of the lighting device 1. The lighting device 1 is, for example, an insect attracting lamp that emits ultraviolet rays. The lighting device 1 includes a light emitting unit 10 and a control unit 20. The light emitting unit 10 is connected to the control unit 20 in a state where it can rotate about the z-axis with respect to the control unit 20. Further, the light emitting unit 10 and the control unit 20 are connected by a lighting wire 31. The control unit 20 is connected to an external AC power supply by a power receiving wire 32.

[0013] The light emitting unit 10 includes a light emitting device 11, a first housing 12, and an optical member 13. The light emitting device 11 emits ultraviolet rays and visible light in the front direction of the first housing 12. Details will be described later. The first housing 12 houses the light emitting device 11 and the optical member 13 inside. The first housing 12 has a light extraction window 14 formed on its front surface. The light extraction window 14 is covered with a cover that transmits ultraviolet rays and visible light and has durability against ultraviolet rays, for example, a cover made of quartz glass. The optical member 13 is a light guide plate, a light diffusing member, a diffraction grating, a lens, etc. that control the propagation direction and the degree of focusing / diffusion of the ultraviolet rays and visible light emitted from the light emitting device 11. The optical member 13 has durability against ultraviolet rays and is formed of, for example, quartz glass.

[0014] The control unit 20 includes a second housing 21, a lighting device 22, and a mounting bracket 23. The second housing 21 houses the lighting device 22 inside. The lighting device 22 receives power from an AC power supply existing outside the lighting device 1 through the power receiving wire 32. Then, the lighting device 22 converts AC to DC and supplies power to the light emitting device 11 through the lighting wire 31. The lighting device 22 includes elements such as a transformer, a capacitor, a diode, etc. The lighting wire 31 inputs the DC output by the lighting device 22 to the light emitting device 11. The mounting bracket 23 is attached to the outer surface of the second housing 21. The mounting bracket 23 is provided with screw holes, and the mounting bracket 23 can be fixed to the ceiling, wall, floor, etc. of a building. The mounting bracket 23 can rotate about the y-axis with respect to the control unit 20 and can adjust the posture of the control unit 20. Note that the mounting bracket 23 may be fixed to the building by an adhesive member. Further, the mounting bracket 23 may be fixed to a pillar or the like via an auxiliary bracket or the like.

[0015] 2. Outline of the light-emitting device Fig. 2 shows an external schematic view of observing the operating state of the light-emitting device 11 using both ultraviolet light and visible light according to the embodiment. Note that Fig. 2 shows the states observed with ultraviolet light and visible light, and both the state of emitting ultraviolet light and the state of emitting visible light are shown as light-emitting states without distinction. The light-emitting device 11 is a light source unit including a substrate 15, a first light source 41 that emits ultraviolet light, and a second light source 51 that emits visible light. The light-emitting device 11 emits ultraviolet light from the first light source 41 and visible light from the second light source 51 respectively according to the voltage applied from the lighting device 22 of the control unit 20. The first light source 41 includes a plurality of ultraviolet elements 42 that emit ultraviolet light. The second light source 51 includes a plurality of visible light elements 52 that emit visible light. Each ultraviolet element 42 is, for example, an LED (Light Emitting Diode) that emits ultraviolet light with a wavelength of 350 nm. Note that each ultraviolet element 42 may be, for example, an LD (Diode Laser) that emits ultraviolet light. Also, the wavelength of the ultraviolet light emitted by each ultraviolet element 42 is not limited to the above, and may be any wavelength suitable for the application. For example, when the application of the ultraviolet light emitted by the light-emitting device 11 is insect attracting, the wavelength of the ultraviolet light is preferably 315 - 400 nm, which is the wavelength of UV-A. Also, for example, when the application of the ultraviolet light emitted by the light-emitting device 11 is sterilization, the wavelength of the ultraviolet light is preferably 100 - 280 nm, which is the wavelength of UV-C. Each visible light element 52 is, for example, an LED that emits blue light with a wavelength of 480 nm. Note that each visible light element 52 may be, for example, an LD that emits visible light, or an organic EL (Electro Luminescence) element.

[0016] When a voltage is applied to the light-emitting device 11, the first light source 41 emits ultraviolet rays, and the second light source 51 emits visible light. Also, in the light-emitting device 11, the higher the intensity of the ultraviolet rays emitted by the first light source 41, the higher the luminance of the visible light emitted by the second light source 51. Therefore, at least a part of the current flowing through the ultraviolet element 42 flows through the visible light element 52. Or, at least a part of the voltage applied to the ultraviolet element 42 is applied to the visible light element 52. That is, the light-emitting device 11 satisfies at least one of the following two conditions. In the first condition, the visible light element 52, or a parallel circuit of the visible light element 52, is connected in series with the ultraviolet element 42, or a parallel circuit of the ultraviolet element 42. In the second condition, the visible light element 52, or a series circuit of the visible light element 52, is connected in parallel with the ultraviolet element 42, or a series circuit of the ultraviolet element 42. Note that all the ultraviolet elements 42 and the visible light elements 52 may be connected in series. Or, all the ultraviolet elements 42 and the visible light elements 52 may be connected in parallel. Also, in the light-emitting device 11, the higher the intensity of the emitted ultraviolet rays, the higher the luminance of the emitted visible light. Therefore, when the light-emitting device 11 is observed from a certain spatial region, the higher the intensity of the ultraviolet rays emitted by the first light source 41, the higher the luminance of the visible light emitted by the second light source 51. The spatial region is preferably a region in the region around the light-emitting device 11 where the ultraviolet rays emitted from the light-emitting device 11 reach with high intensity without being blocked. The spatial region is, for example, a region existing in the light emission direction from the light-emitting device 11. The light emission direction is the propagation direction of the light emitted from the light-emitting device 11. Or, the spatial region is, for example, a region on the optical axis of the optical member 13. Note that when the ultraviolet rays emitted from the light-emitting device 11 have directivity, in a region deviated from the emission direction, it is not always the case that the higher the intensity of the ultraviolet rays emitted by the first light source 41, the higher the luminance of the visible light emitted by the second light source 51.

[0017] When visually observing the light-emitting device 11 in the operating state, almost no or no light emitted from the first light source 41 is visible, and the visible light emitted from the second light source 51 is visible. FIG. 3 is a schematic external view of observing the operating state of the light-emitting device 11 using visible light. Note that FIGS. 2 and 3 show the same operating state of the first light source 41. The visible light element 52 included in the second light source 51 emits visible light. Therefore, there is no difference in the emission state of visible light between the light-emitting device 11 shown in FIG. 2 and the emission state of visible light of the light-emitting device 11 shown in FIG. 3 for the second light source 51. On the other hand, the ultraviolet element 42 included in the first light source 41 emits ultraviolet light but emits almost no or no visible light. Therefore, in the emission state of visible light of the light-emitting device 11 shown in FIG. 3, although the ultraviolet element 42 of the first light source 41 emits light, it appears to emit almost no or no light. However, as described above, in the light-emitting device 11, the higher the intensity of the ultraviolet light emitted by the first light source 41, the higher the luminance of the visible light emitted by the second light source 51. That is, the luminance of the visible light emitted by the second light source 51 serves as an index indicating the intensity of the ultraviolet light emitted by the first light source 41. Note that the intensity of ultraviolet light can be represented by, for example, the radiant energy, luminous flux, or illuminance of ultraviolet light. Also, the intensity of ultraviolet light can be represented by the irradiance in a predetermined region irradiated with ultraviolet light. Hereinafter, as a parameter indicating the intensity of ultraviolet light, the irradiance of ultraviolet light on a region located at a predetermined distance from the light-emitting device 11 is used. Also, as a parameter indicating the intensity of visible light, the luminance of visible light with a region located at a predetermined distance from the light-emitting device 11 as an observation point is used.

[0018] 3. Relationship between ultraviolet irradiance and visible light luminance The light-emitting device 11 according to the embodiment further has the following relationship between the irradiance of ultraviolet light emitted by the first light source 41 and the luminance of visible light emitted by the second light source 51.

[0019] When a predetermined voltage is applied to the light-emitting device 11, the maximum irradiance of ultraviolet light in a region where the distance from the light-emitting device 11 is 20 cm is [W / m 2When expressed in units of 2 , the value is taken as the first value X1. Here, the maximum irradiance of ultraviolet light refers to the maximum value among the irradiances corresponding to each observation region when a plurality of observation regions with a distance of 20 cm from the light-emitting device 11 are provided. When the ultraviolet light has directivity and the intensity in the emission direction is greater than the intensity in other directions, the irradiance at a position 20 cm away from the light-emitting device 11 in the emission direction is the maximum irradiance. That is, the irradiance at a position 20 cm away from the light-emitting device 11 in the light emission direction is the maximum irradiance. And when the same predetermined voltage is applied to the light-emitting device 11, the maximum luminance of the visible light emitted by the light-emitting device 11 is 2 When expressed in units of 2 , the value is taken as the second value X2. Here, the maximum luminance of visible light refers to the maximum value of the luminance when the luminance of visible light is measured from a plurality of positions with different orientations with respect to the light-emitting device 11. At this time, the second value X2 is equal to or greater than the integrated value (k × X1) of the first value X1 and the predetermined ratio k. That is, when the maximum irradiance of ultraviolet light in the region where the distance from the light-emitting device 11 is 20 cm or less is X1 [W / m 2 , the luminance of the visible light emitted from the light-emitting device 11 is (k × X1) [cd / m 2 or more. Also, when the luminance of the visible light emitted from the light-emitting device is X2 [cd / m 2 , the irradiance of ultraviolet light in the region where the distance from the light-emitting device 11 is 20 cm is (X2 / k) [W / m

[0020] The predetermined ratio k is a value that satisfies the following conditions. That is, the product of the irradiance of high-intensity ultraviolet light expressed in units of [W / m 2 and the predetermined ratio k is equal to the value of the luminance of very dazzling visible light expressed in units of [cd / m 2 , and the predetermined ratio k is determined accordingly. The value of the irradiance of high-intensity ultraviolet light expressed in units of [W / m 2 is, for example, 100. That is, the irradiance of high-intensity ultraviolet light is 100 W / m2 Or, the value representing the irradiance of high-intensity ultraviolet light in the unit of [W / m 2 is, for example, a value of 100 or more. The predetermined ratio k varies depending on the chromaticity of visible light. The reason is that the relationship between luminance and the dazzling feeling felt by a person differs depending on the chromaticity of visible light.

[0021] When the visible light is blue light, the predetermined ratio k is 18. The reason is that the minimum luminance of very dazzling blue light is about 1870 cd / m 2 This is because. As the blue light, for example, monochromatic light with a wavelength of 400 to 500 nm can be used. Or, for example, the blue light may be light having a dominant wavelength of 400 to 500 nm.

[0022] By satisfying the above conditions, when the first light source 41 emits high-intensity ultraviolet light, the second light source 51 emits very dazzling visible light in the light-emitting device 11. Therefore, if a person avoids very dazzling visible light, such as looking away from or turning their back to the light-emitting device 11, they can also avoid high-intensity ultraviolet light. That is, the very dazzling visible light emitted from the second light source 51 functions as a notification or warning to prompt a person to avoid the visible light and ultraviolet light emitted by the light-emitting device 11. The case where the first light source 41 emits high-intensity ultraviolet light may be considered for the following reasons, for example. For example, it is conceivable that an overvoltage is applied to the light-emitting device 11 and / or an overcurrent flows due to a failure of an AC power supply or the lighting device 22. Or, for example, it is conceivable that a part of the first light source 41 of the light-emitting device 11 fails and an overcurrent flows into another part of the first light source 41. Or, for example, it is conceivable that a failure occurs in the dimming function or a function related to the dimming function in the dimmable lighting device 1.

[0023] Note that the visible light is not limited to blue light, and light of any color may be used. Hereinafter, the cases where the visible light is red light, yellow light, green light, and white light will be described. Note that the irradiance of high-intensity ultraviolet light is 100 W / m as described above 2 is.

[0024] When using red light as visible light, a predetermined ratio k is 25. The minimum luminance of very bright red light is about 2520 cd / m 2 because of this. As the red light, for example, monochromatic light with a wavelength of 590 to 830 nm can be used. Or, for example, the red light may be light with a dominant wavelength of 590 to 830 nm.

[0025] When using yellow light as visible light, a predetermined ratio k is 25. The minimum luminance of very bright yellow light is about 2580 cd / m 2 because of this. As the yellow light, for example, monochromatic light with a wavelength of 570 to 590 nm can be used. Or, for example, the yellow light may be light with a dominant wavelength of 570 to 590 nm.

[0026] When using green light as visible light, a predetermined ratio k is 32. The minimum luminance of very bright green light is about 3290 cd / m 2 because of this. As the green light, for example, monochromatic light with a wavelength of 500 to 570 nm can be used. Or, for example, the green light may be light with a dominant wavelength of 500 to 570 nm.

[0027] When using white light with a color temperature of less than 3000K as visible light, a predetermined ratio k is 25. The minimum luminance of very bright white light is, for example, about 2570 cd / m for a color temperature of 2500K 2 is.

[0028] When using white light with a color temperature of 3000K or more and less than 6500K as visible light, a predetermined ratio k is 21. The minimum luminance of very bright white light is, for example, about 2640 cd / m for a color temperature of 3300K 2 , about 2450 cd / m for a color temperature of 4200K 2 , about 2170 cd / m for a color temperature of 6500K 2 is.

[0029] When using white light with a color temperature of 6500K or more as visible light, a predetermined ratio k is 21. The minimum luminance of very bright white light is, for example, about 2170 cd / m for a color temperature of 6500K2 、For a color temperature of 14000K, it is approximately 2230 cd / m 2 .

[0030] <(Bracket)> As described above, when a voltage is applied, the light-emitting device 11 according to the embodiment emits ultraviolet light and visible light. Also, in the light-emitting device 11 according to the embodiment, the higher the irradiance of the ultraviolet light emitted by the first light source 41, the higher the luminance of the visible light emitted by the second light source 51. Therefore, the luminance of the visible light emitted by the light-emitting device 11 serves as an index of the irradiance of the ultraviolet light emitted by the light-emitting device 11. That is, even when the first light source 41 emits little or almost no visible light, a person can confirm the irradiance of the ultraviolet light emitted by the light-emitting device 11 using the visible light emitted by the light-emitting device 11 as an index.

[0031] Also, in the light-emitting device 11 according to the embodiment, if the first light source 41 emits ultraviolet light with a high irradiance, the second light source 51 emits very bright visible light. Therefore, if a person avoids very bright visible light, such as looking away from or turning their back to the light-emitting device 11, they can also avoid ultraviolet light with a high irradiance. That is, the very bright visible light emitted by the light-emitting device 11 functions as a notice or warning prompting a person to avoid the ultraviolet light emitted by the light-emitting device 11. Therefore, by using the light-emitting device 11 according to the embodiment, it is possible to suppress a situation where a person continues to be affected by ultraviolet light with a high irradiance without noticing.

[0032] ≪Other Modification Examples According to the Embodiment≫ (1) In the embodiment, the wavelength of the ultraviolet rays emitted by the ultraviolet element 42 is 350 nm. However, the wavelength of the ultraviolet rays in the embodiment is an example, and the wavelength of the ultraviolet rays may be any wavelength as long as it is a wavelength of ultraviolet rays that functions as an insect attractor. The preferable wavelength as an insect attractor is within the range of 315 to 400 nm, which is UV-A as described above. Further, the uses of the lighting device 1 and the light-emitting device 11 are not limited to an insect attractor. For example, the light-emitting device 11 may be used as a so-called black light. Also, for example, the lighting device 1 may be a germicidal lamp. When the lighting device 1 is a germicidal lamp, it is preferable that the wavelength of the ultraviolet rays emitted by the first light source 41 is within the range of 100 to 280 nm, which is UV-C. Further, the lighting device 1 may be any use as long as it uses ultraviolet rays, such as a germicidal and deodorizing lamp, lighting for plant growth, lighting for animal breeding, etc., and the wavelength of the ultraviolet rays may be suitable for the use.

[0033] (2) In the embodiment, the first light source 41 of the light-emitting device 11 includes one type of ultraviolet element 42. However, for example, the first light source 41 may include a plurality of types of ultraviolet elements having different peak wavelengths of the emitted ultraviolet rays. Also, for example, the first light source 41 may include different types of ultraviolet elements. For example, the first light source 41 may include a combination of an LD and an LED. Also, for example, the first light source 41 may include a combination of a light-emitting element such as an LED or an LD and a wavelength conversion material that converts the ultraviolet rays emitted by the light-emitting element into ultraviolet rays of a predetermined wavelength. Note that the first light source 41 may include only a single ultraviolet element. Also, the first light source 41 may include any type of element, module, or discharge tube as long as it functions as an ultraviolet light source.

[0034] (3) In the embodiment, the second light source 51 of the light-emitting device 11 includes one type of visible light element 52. However, for example, the second light source 51 may include a plurality of types of visible light elements having different peak wavelengths of the emitted visible light. By combining visible light elements with different peak wavelengths, the chromaticity of the visible light emitted by the second light source 51 can be easily made into a desired chromaticity. Or, by combining visible light elements with different peak wavelengths, a second light source 51 that emits high-brightness white light can be easily realized. Also, for example, the second light source 51 may include different types of visible light elements. For example, the second light source 51 may include a combination of an LED and an organic EL element. Also, for example, the second light source 51 may include a combination of a light-emitting element such as an LED or an LD and a fluorescent material that converts ultraviolet light or visible light emitted by the light-emitting element into visible light of a predetermined wavelength. Note that the second light source 51 may include only a single visible light element. Also, as long as the second light source 51 functions as a visible light source, it may include any type of element, module, or light-emitting tube.

[0035] (4) In the embodiment, the light-emitting device 11 includes the first light source 41 and the second light source 51 on a single substrate 15. However, if the first light source 41 and the second light source 51 of the light-emitting device 11 are connected to the same lighting device 22 and emit light simultaneously, they may be formed across two or more substrates. For example, the light-emitting device 11 may be such that the first light source 41 is provided on a first substrate and the second light source 51 is provided on a second substrate. Or, for example, the light-emitting device 11 may be such that a part of the first light source 41 and a part of the second light source 51 are provided on a first substrate, and the remaining part of the first light source 41 and the remaining part of the second light source 51 are provided on a second substrate.

[0036] (5) In the embodiment, the lighting device 1 includes one lighting device 22 and one light emitting device 11 respectively. However, for example, the lighting device 1 may include a plurality of light emitting devices 11. For example, the lighting device 1 may house a plurality of light emitting devices 11 in one housing, and the plurality of light emitting devices 11 may be regarded as one light source. Even when the plurality of light emitting devices 11 are regarded as one light source, the light source including the plurality of light emitting devices 11 emits very dazzling visible light when the illuminance of ultraviolet light is high. For example, when two light emitting devices 11 are regarded as one light source, when the ultraviolet light emitted by one light emitting device 11 has an illuminance that is 1 / 2 of the high illuminance, the visible light emitted by one light emitting device 11 has a luminance that is 1 / 2 of the very dazzling luminance. Therefore, when two light emitting devices 11 are regarded as one light source, when the ultraviolet light emitted by the light source has a high illuminance, the visible light emitted by the light source has a very dazzling luminance. That is, even when the plurality of light emitting devices 11 according to the embodiment are regarded as one light source, the same effects as those of the light emitting device 11 according to the embodiment are achieved.

[0037] Also, the lighting system according to the embodiment may include one or more lighting devices 22 and a plurality of light emitting devices 11.

[0038] (6) In the embodiment, when a predetermined voltage is applied to the light emitting device 11, the maximum irradiance of ultraviolet light in the region where the distance from the light emitting device 11 is 20 cm is defined as the first value X1 in units of [W / m 2 . However, considering the light distribution of the ultraviolet light emitted from the light emitting device 11, the irradiance of the ultraviolet light at a position 20 cm away from the light emitting device 11 in a specific direction may be defined as the first value X1 in units of [W / m 2 . The specific direction is, for example, the emission direction of the light emitting device 11. For example, when the front direction of the light emitting device 11 is the emission direction, the above-mentioned specific direction is the front direction. That is, the irradiance of the ultraviolet light at a position 20 cm away from the light emitting device 11 in the emission direction is [W / m 2The value represented in the unit of 2 may be used as the first value X1. Note that, depending on the light distribution of the ultraviolet rays emitted from the light-emitting device 11, the maximum irradiance of the ultraviolet rays in the region where the distance from the light-emitting device 11 is 20 cm or less may be 2 The value represented in the unit of ]] may be used as the first value X1.

[0039] (7) In the embodiment, the lighting device 22 receives alternating current from an AC power source existing outside the lighting device 1 through the power receiving wire 32 and converts the alternating current into direct current. However, the lighting device 22 may have any configuration as long as it is a lighting circuit that lights the light-emitting device 11. For example, the lighting device 22 may receive direct current from a battery. In this case, the lighting device 1 includes a battery and a battery case that houses the battery. The battery may be, for example, a primary battery such as a dry battery or a secondary battery. The secondary battery is, for example, a nickel-metal hydride battery or a lithium-ion battery. The lighting device 22 converts the magnitude of the direct current received from the battery into a magnitude suitable for the first light source 41 and the second light source 51 of the light-emitting device 11 and outputs the converted direct current to the light-emitting device 11. Alternatively, for example, the lighting device 1 may include a solar cell and a storage battery. Also, the lighting device 22 may receive direct current from an external solar cell. For example, the lighting device 22 may receive direct current from a solar cell that is separate from the lighting device 1. Further, the lighting device 22 may perform on / off control or dimming control of the light-emitting device 11. For example, the lighting device 22 may include an illuminance sensor, a human sensor, or a timer.

[0040] <<Summary>> The light-emitting device (11) according to the first aspect includes a first light source (41) that emits ultraviolet light and a second light source (51) that emits visible light. The first light source (41) and the second light source (51) are connected in parallel or in series. The higher the intensity of the ultraviolet light emitted by the first light source (41), the higher the luminance of the visible light emitted by the second light source (51).

[0041] According to the light-emitting device (11) according to the first aspect, the intensity of ultraviolet light can be notified to people by using the luminance of visible light. In particular, when the intensity of ultraviolet light is high, it is possible to alert people by using visible light with high luminance. Therefore, it is possible to prevent a situation in which a person is affected by ultraviolet light without noticing when the light-emitting device (11) emits strong ultraviolet light.

[0042] The light-emitting device (11) according to the second aspect is the same as the first aspect, except that the visible light emitted by the second light source (51) is blue light. In the light-emitting device (11) according to the second aspect, the maximum luminance of the blue light is 18 times or more the value indicated in the unit of W / m 2 for the value indicated in the unit of the maximum irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11). 2 in the unit of cd / m

[0043] According to the light-emitting device (11) according to the second aspect, when the irradiance of ultraviolet light is 100 W / m 2 or more, blue light of 1800 cd / m 2 or more is emitted. Therefore, it is possible to avoid directly looking at the light-emitting device (11) in a state where high-intensity ultraviolet light is emitted by the high-luminance blue light that makes people feel dazzling.

[0044] The light-emitting device (11) according to the third aspect is the same as the first aspect, except that the visible light emitted by the second light source (51) is red light. In the light-emitting device (11) according to the third aspect, the maximum luminance of the red light is 25 times or more the value indicated in the unit of W / m 2 for the value indicated in the unit of the maximum irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11). 2 in the unit of cd / m

[0045] According to the light-emitting device (11) according to the third aspect, when the illuminance of ultraviolet light is 100 W / m 2 or more, it emits red light of 2500 cd / m 2 or more. Therefore, it is possible to avoid direct viewing of the light-emitting device (11) in a state where high-intensity ultraviolet light is emitted by the high-brightness red light that makes people feel dazzling.

[0046] In the light-emitting device (11) according to the fourth aspect, in the first aspect, the visible light emitted by the second light source (51) is yellow light. In the light-emitting device (11) according to the fourth aspect, with respect to the value indicated in the unit of W / m 2 for the maximum irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11), the value indicated in the unit of cd / m 2 for the maximum luminance of yellow light is 25 times or more.

[0047] According to the light-emitting device (11) according to the fourth aspect, when the illuminance of ultraviolet light is 100 W / m 2 or more, it emits yellow light of 2500 cd / m 2 or more. Therefore, it is possible to avoid direct viewing of the light-emitting device (11) in a state where high-intensity ultraviolet light is emitted by the high-brightness yellow light that makes people feel dazzling.

[0048] In the light-emitting device (11) according to the fifth aspect, in the first aspect, the visible light emitted by the second light source (51) is green light. In the light-emitting device (11) according to the fifth aspect, with respect to the value indicated in the unit of W / m 2 for the maximum irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11), the value indicated in the unit of cd / m 2 for the maximum luminance of green light is 32 times or more.

[0049] According to the light-emitting device (11) according to the fifth aspect, when the illuminance of ultraviolet light is 100 W / m 2 or more, it emits green light of 3200 cd / m 2 or more. Therefore, it is possible to avoid direct viewing of the light-emitting device (11) in a state where high-intensity ultraviolet light is emitted by the high-brightness green light that makes people feel dazzling.

[0050] In the sixth aspect, the light-emitting device (11) is such that, in the first aspect, the visible light emitted by the second light source (51) is white light with a color temperature of less than 3000K. In the light-emitting device (11) according to the sixth aspect, with respect to the value indicated in units of W / m of the maximum irradiance of ultraviolet rays in the region 20 cm from the light-emitting device (11), the value indicated in units of cd / m of the maximum luminance of the white light is 25 times or more. 2 of the white light. 2 is 25 times or more.

[0051] According to the light-emitting device (11) according to the sixth aspect, when the irradiance of ultraviolet rays is 100 W / m 2 or more, white light of 2500 cd / m 2 or more is emitted. Therefore, it is possible to avoid direct viewing of the light-emitting device (11) in a state where high-intensity ultraviolet rays are being emitted by high-brightness white light to such an extent that a person feels dazzled.

[0052] In the seventh aspect, the light-emitting device (11) is such that, in the first aspect, the visible light emitted by the second light source (51) is white light in the range of a color temperature of 3000K or more and less than 6500K. In the light-emitting device (11) according to the seventh aspect, with respect to the value indicated in units of W / m of the maximum irradiance of ultraviolet rays in the region 20 cm from the light-emitting device (11), the value indicated in units of cd / m of the maximum luminance of the white light is 21 times or more. 2 of the white light. 2 is 21 times or more.

[0053] According to the light-emitting device (11) according to the seventh aspect, when the irradiance of ultraviolet rays is 100 W / m 2 or more, white light of 2100 cd / m 2 or more is emitted. Therefore, it is possible to avoid direct viewing of the light-emitting device (11) in a state where high-intensity ultraviolet rays are being emitted by high-brightness white light to such an extent that a person feels dazzled.

[0054] In the eighth aspect, the light-emitting device (11) is such that, in the first aspect, the visible light emitted by the second light source (51) is white light with a color temperature of 6500K or more. In the light-emitting device (11) according to the eighth aspect, with respect to the value indicated in units of W / m of the maximum irradiance of ultraviolet rays in the region 20 cm from the light-emitting device (11), 2For the value expressed in units of, the maximum luminance of white light is cd / m 2 The value expressed in units of is 21 times or more.

[0055] According to the light-emitting device (11) according to the eighth aspect, when the illuminance of ultraviolet light is 100 W / m 2 or more, white light of 2100 cd / m 2 or more is emitted. Therefore, it is possible to avoid direct viewing of the light-emitting device (11) in a state where high-intensity ultraviolet light is emitted by white light having a high luminance to such an extent that a person feels dazzling.

[0056] The light-emitting device (11) according to the ninth aspect is, in any one of the second to eighth aspects, the maximum irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11) is W / m 2 The value expressed in units of is the value of the illuminance of ultraviolet light at a position 20 cm in the emission direction of the light-emitting device (11) from the light-emitting device (11) expressed in units of W / m 2 expressed in units of.

[0057] According to the light-emitting device according to the ninth aspect, when the illuminance of ultraviolet light is high in the emission direction of the light-emitting device (11), it is not necessary to consider other directions, so the design of the light-emitting device (11) becomes easy.

[0058] The light-emitting device (11) according to the tenth aspect is, in any one of the second to ninth aspects, the greater the maximum irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11), the higher the maximum luminance of visible light.

[0059] According to the light-emitting device according to the tenth aspect, the magnitude of the irradiance of ultraviolet light in the region 20 cm from the light-emitting device (11) can be recognized by a person as the level of the luminance of the visible light emitted by the light-emitting device (11). Therefore, not only can a person determine whether the light-emitting device (11) is emitting ultraviolet light, but also based on the intensity of the ultraviolet light, a person can take appropriate actions.

[0060] The light-emitting device (11) according to the 11th aspect, in any one of the 1st to 10th aspects, the first light source (41) includes a solid-state light-emitting element (42).

[0061] According to the light-emitting device (11) according to the 11th aspect, even when the first light source (41) does not emit visible light or when the luminance of the visible light emitted by the first light source (41) is low, it is possible to notify a person of the emission of high-intensity ultraviolet rays using high-luminance visible light.

[0062] The light-emitting device (11) according to the 12th aspect, in any one of the 1st to 11th aspects, the second light source (51) includes a solid-state light-emitting element (52).

[0063] According to the light-emitting device (11) according to the 12th aspect, it is easy to increase the luminance of the visible light emitted by the second light source (51). Therefore, the light-emitting device (11) can be easily realized.

[0064] The light-emitting device (11) according to the 13th aspect, in any one of the 1st to 12th aspects, further includes a substrate (15). In the light-emitting device (11) according to the 13th aspect, the first light source (41) and the second light source (51) are provided on the substrate (15).

[0065] According to the light-emitting device (11) according to the 13th aspect, it is less likely that a failure occurs in which the second light source (51) does not emit light while the first light source (41) remains normal. Also, according to the light-emitting device (11) according to the 13th aspect, the light emission direction of the first light source (41) and the light emission direction of the second light source (51) do not differ greatly. Therefore, the relationship between the intensity of the ultraviolet rays emitted by the light-emitting device (11) and the luminance of the visible light does not depend on the distance or direction from the light-emitting device (11). Therefore, at any position, the luminance of the visible light emitted by the light-emitting device (11) serves as an index indicating the intensity of the ultraviolet rays emitted by the light-emitting device (11).

[0066] The lighting device (1) according to the 14th aspect includes the light-emitting device (11) according to any one of the 1st to 13th aspects and a lighting device (22) for lighting the light-emitting device (11).

[0067] According to the lighting device (1) according to the 14th aspect, the intensity of ultraviolet rays can be notified to a person by using the luminance of visible light. In particular, when the intensity of ultraviolet rays is high, it is possible to alert a person by using visible light with high luminance. Therefore, it is possible to prevent a situation in which a person is affected by ultraviolet rays without noticing when the lighting device (1) emits strong ultraviolet rays.

Explanation of Signs

[0068] 1 Lighting device 11 Light emitting device 15 Substrate 22 Lighting device 41 First light source 42 Ultraviolet element (solid light emitting element) 51 Second light source 52 Visible light element (solid light emitting element)

Claims

1. A first light source that emits ultraviolet light; a second light source that emits visible light; A light emitting device comprising: The first light source and the second light source are connected in parallel or in series, The greater the maximum irradiance of the ultraviolet light emitted by the first light source in a region 20 cm away from the light-emitting device, the higher the maximum luminance of the visible light emitted by the second light source. Light emitting device.

2. the visible light emitted by the second light source is blue light; The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the blue light is expressed in cd / m ２ The value shown in units of is 18 times or more. The light emitting device according to claim 1 .

3. the visible light emitted by the second light source is red light, The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the red light is expressed in cd / m ２ The value shown in units of is 25 times or more. The light emitting device according to claim 1 .

4. the visible light emitted by the second light source is yellow light; The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the yellow light is expressed in cd / m ２ The value shown in units of is 25 times or more. The light emitting device according to claim 1 .

5. the visible light emitted by the second light source is green light; The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the green light is expressed in cd / m ２ The value shown in units of is 32 times or more. The light emitting device according to claim 1 .

6. The visible light emitted by the second light source is white light having a color temperature of less than 3000K; The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the white light is expressed in cd / m ２ The value shown in units of is 25 times or more. The light emitting device according to claim 1 .

7. The visible light emitted by the second light source is white light having a color temperature in the range of 3000 K or more and less than 6500 K, The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the white light is expressed in cd / m ２ The value shown in units of is 21 times or more. The light emitting device according to claim 1 .

8. The visible light emitted by the second light source is white light having a color temperature of 6500K or more, The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The maximum luminance of the white light is expressed in cd / m ２ The value shown in units of is 21 times or more. The light emitting device according to claim 1 .

9. The maximum irradiance of the ultraviolet light in an area 20 cm from the light-emitting device is W / m ２ The value shown in units of W / m is the irradiance of the ultraviolet light at a position 20 cm from the light emitting device in the direction of emission of the light emitting device. ２ The value is expressed in units of A light emitting device according to any one of claims 2 to 8.

10. the first light source includes a solid-state light emitter; A light emitting device according to any one of claims 1 to 9.

11. The second light source includes a solid-state light emitting element. A light emitting device according to any one of claims 1 to 10.

12. Further comprising a substrate; The first light source and the second light source are provided on the substrate. A light emitting device according to any one of claims 1 to 11.

13. A light emitting device according to any one of claims 1 to 12, A lighting device that lights the light emitting device; A lighting device comprising:

Images