Lighting device and lighting system

Abstract

To easily adjust a light distribution.SOLUTION: An illuminating device 1 comprises a board 11, a plurality of light emitting elements (first light emitting elements 12), and a light distribution control member (first light distribution control member 13). The light distribution control member is formed in a long shape that is long in a first direction, and controls the light distribution of light emitted from the plurality of light emitting elements arranged on one principal surface (first principal surface 111) of the board 11. The light distribution control member controls the light distribution of the light emitted from the plurality of light emitting elements so that the 1 / 2 beam angle of the light becomes 20 degrees or less. A distance L1 between an emitting surface 121 of each of the plurality of light emitting elements and an incidence surface 133 of the light distribution control member in a second direction D2 is 3.17 times or more and 7 times or less as long as a length W1 of each of the plurality of light emitting elements in a third direction D3. An angle θ1 formed by an optical axis A1 of each of the plurality of light emitting elements and an optical axis A2 of the light distribution control member is 12 degrees or less.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates generally to lighting devices and lighting systems, and more particularly to a lighting device including a substrate and a plurality of light-emitting elements disposed on one main surface of the substrate, and a lighting system including the lighting device. [Background technology]

[0002] Patent Document 1 describes an illumination device (illumination system) including a first light source unit (first illumination device), a second light source unit (second illumination device), and a housing. Each of the first light source unit and the second light source unit includes an LED, a substrate, an aluminum heat sink, and a reflector. The first light source unit and the second light source unit are fixed to the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 1255557 Summary of the Invention [Problem to be solved by the invention]

[0004] In the lighting device described in Patent Document 1, the entire housing is adjusted when the light distribution is changed, which may require providing a large movable area space or may make it difficult to make fine adjustments.

[0005] An object of the present disclosure is to provide a lighting device and a lighting system that allow for easy adjustment of light distribution. [Means for solving the problem]

[0006] An illumination device according to one aspect of the present disclosure includes a substrate, a plurality of light-emitting elements, and a light distribution control member. The substrate is formed in an elongated shape that is long in a first direction. The plurality of light-emitting elements are arranged on one main surface of the substrate along the first direction. The light distribution control member is formed in an elongated shape that is long in the first direction and controls the light distribution of light emitted from the plurality of light-emitting elements arranged on the one main surface of the substrate. The light distribution control member controls the light distribution so that the half beam angle of the light emitted from the plurality of light-emitting elements is 20 degrees or less. The distance in the second direction between the emission surface of each of the plurality of light-emitting elements and the incidence surface of the light distribution control member is 3.17 times or more and 7 times or less the length of each of the plurality of light-emitting elements in a third direction. The second direction is a thickness direction of the substrate. The third direction is a direction perpendicular to both the first direction and the second direction. The angle between the optical axis of each of the plurality of light-emitting elements and the optical axis of the light distribution control member is 12 degrees or less.

[0007] An illumination system according to one aspect of the present disclosure includes a first illumination device and a second illumination device. The first illumination device is the illumination device and irradiates an illumination surface with a first illumination light. The second illumination device irradiates the illumination surface with a second illumination light. The second illumination device has a wider light distribution angle than the first illumination device. In a normal direction of the illumination surface, the distance from the second illumination device to the illumination surface is shorter than the distance from the first illumination device to the illumination surface. [Effects of the Invention]

[0008] According to the lighting device and lighting system according to an aspect of the present disclosure, it is possible to easily adjust the light distribution. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a configuration diagram of a lighting system according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram of an installation state of the lighting system. [Figure 3] FIG. 3 is a perspective view of the appearance of the lighting device. [Figure 4] FIG. 4 is an exploded perspective view of the lighting device. [Figure 5] 5 is a cross-sectional view of the lighting device taken along line X1-X1 of FIG. 3. FIG. [Figure 6] FIG. 6 is a partially enlarged view of FIG. 5 relating to the above lighting device. [Figure 7] FIG. 7 is a plan view of the lighting device. [Figure 8] FIG. 8 is a light distribution curve diagram showing the light distribution characteristics of the lighting device. [Figure 9] FIG. 9 is a light distribution curve diagram showing the light distribution characteristics of a second lighting device that constitutes the lighting system of the above embodiment. [Figure 10] FIG. 10 is an explanatory diagram illustrating the positional relationship between a light emitting element and a light distribution control member in the above lighting device. [Figure 11] FIG. 11 is a graph showing the relationship between the distance between the emission surface of the light emitting element and the incidence surface of the light distribution control member and the incidence efficiency in the above lighting device. [Figure 12] FIG. 12 is a schematic diagram of an illumination area formed on an illumination surface by the illumination system. [Figure 13] FIG. 13 is an explanatory diagram illustrating the positional relationship between the first lighting device and the second lighting device in the lighting system. [Figure 14] FIG. 14 is a graph showing the relationship between the angle between the optical axis of the light-emitting element and the optical axis of the light distribution control member and the illuminance gradient when the first lighting device constituting the above lighting system is located at the first position. [Figure 15] FIG. 15 is a graph showing the relationship between the angle between the optical axis of the light-emitting element and the optical axis of the light distribution control member and the illuminance gradient when the first lighting device constituting the above lighting system is located at the second position. [Figure 16] Fig. 16A is a schematic diagram of an illumination device according to Modification 1 of the embodiment, and Fig. 16B is a schematic diagram of an angle adjustment mechanism of the illumination device. [Figure 17] Fig. 17A is a schematic diagram of an illumination device according to Modification 2 of the embodiment, and Fig. 17B is a schematic diagram of an angle adjustment mechanism of the illumination device. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, lighting devices and lighting systems according to embodiments will be described with reference to the drawings. The figures described in the following embodiments are schematic diagrams, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0011] (Embodiment) (1) Overview First, an overview of a lighting device 1 and a lighting system 10 according to an embodiment will be described with reference to FIGS.

[0012] As shown in FIG. 2, for example, the lighting system 10 according to the embodiment is used to indirectly illuminate the electrical appliance 8 from behind (the left side of FIG. 2) when a user of the electrical appliance 8 (hereinafter referred to as "worker 300") performs work while looking at a display screen 81 of the electrical appliance 8. The electrical appliance 8 is, for example, a notebook-sized personal computer. As shown in FIG. 2, the lighting system 10 according to the embodiment indirectly illuminates the electrical appliance 8 located in front of the illumination surface S1 (the right side of FIG. 2) by irradiating an illumination surface S1 located behind the electrical appliance 8 with a first illumination light 101 from a first illumination device 1 and a second illumination light 102 from a second illumination device 2. In the lighting system 10 according to the embodiment, the illumination surface S1 is, for example, the surface (front surface) of a partition 400 that forms a workspace WS1.

[0013] As shown in FIGS. 1 and 2, the lighting system 10 according to the embodiment includes a first lighting device 1 (hereinafter also referred to as "lighting device 1") and a second lighting device 2. The first lighting device 1 irradiates an irradiation surface S1 with a first illumination light 101. The second lighting device 2 irradiates an irradiation surface S1 with a second illumination light 102. The irradiation surface S1 is, for example, the surface of a partition 400 for forming a workspace WS1, as shown in FIG. 2. As shown in FIG. 2, the second lighting device 2 has a wider light distribution angle than the first lighting device 1. In a third direction D3 (the left-right direction in FIG. 2) that is the normal direction of the irradiation surface S1, a distance L21 from the second lighting device 2 to the irradiation surface S1 is shorter than a distance L11 from the first lighting device 1 to the irradiation surface S1. That is, the second lighting device 2 is located closer to the irradiation surface S1 than the first lighting device 1 in the third direction D3.

[0014] 3 to 7, lighting device 1 according to the embodiment includes substrate 11, a plurality of first light-emitting elements (light-emitting elements) 12, and first light distribution control member (light distribution control member) 13. Substrate 11 is formed in an elongated shape that is long in first direction D1. A plurality of first light-emitting elements 12 are arranged along first direction D1 on first main surface (one main surface) 111 of substrate 11. First light distribution control member 13 is formed in an elongated shape that is long in first direction D1, and controls the light distribution of light emitted from a plurality of first light-emitting elements 12 arranged on first main surface 111 of substrate 11. First light distribution control member 13 controls the light distribution so that the half beam angle of light emitted from a plurality of first light-emitting elements 12 is 20 degrees or less. Distance L1 in second direction D2 between emission surface 121 of each of multiple first light-emitting elements 12 and incidence surface 133 of first luminous intensity distribution control member 13 is 3.17 to 7 times the length W1 of each of multiple light-emitting elements 12 in third direction D3. Second direction D2 is the thickness direction of substrate 11. Third direction D3 is a direction perpendicular to both first direction D1 and second direction D2. Angle θ1 between optical axis A1 of each of multiple first light-emitting elements 12 and optical axis A2 of first luminous intensity distribution control member 13 is 12 degrees or less.

[0015] In lighting device 1 according to the embodiment, distance L1 in second direction D2 between emission surface 121 of each of multiple first light-emitting elements 12 and incidence surface 133 of first light distribution control member 13 is 3.17 to 7 times the length W1 of each of multiple light-emitting elements 12 in third direction D3. Furthermore, in lighting device 1 according to the embodiment, angle θ1 between optical axis A1 of each of multiple first light-emitting elements 12 and optical axis A2 of first light distribution control member 13 is 12 degrees or less. That is, lighting device 1 according to the embodiment enables adjustment of light distribution simply by adjusting the position and angle of first light distribution control member 13 relative to multiple first light-emitting elements 12 within the above range. In short, lighting device 1 according to the embodiment enables easier adjustment of light distribution compared to adjusting the position and angle of the entire lighting device.

[0016] 2, in the lighting system 10 according to the embodiment, a distance L21 from the second lighting device 2 to the lighting surface S1 in the normal direction (third direction D3) of the lighting surface S1 is shorter than a distance L11 from the first lighting device 1 to the lighting surface S1. That is, in the lighting system 10 according to the embodiment, the second lighting device 2 is located closer to the lighting surface S1 than the first lighting device 1. Furthermore, in the lighting system 10 according to the embodiment, the second lighting device 2 has a wider light distribution angle than the first lighting device 1. This makes it possible to achieve beautiful gradation lighting by the first lighting light 101 from the first lighting device 1 and the second lighting light 102 from the second lighting device 2.

[0017] In the following description, the third direction D3, which is the normal direction to the irradiation surface S1, is defined as the front-rear direction, the first direction D1, which is the longitudinal direction of the substrate 11, is defined as the left-right direction, and the second direction D2, which is the thickness direction of the substrate 11, is defined as the up-down direction, but these directions are not intended to limit the directions in which the lighting device 1 and the lighting system 10 are used. Furthermore, the arrows indicating "D1", "D2", and "D3" in the drawings are merely shown for the purpose of explanation and none of them have any substance.

[0018] (2)Details Next, the configuration of a lighting system 10 according to an embodiment will be described with reference to FIGS.

[0019] 1, a lighting system 10 according to an embodiment includes a first lighting device 1 and a second lighting device 2. The lighting system 10 according to an embodiment further includes a first driving unit 3, a second driving unit 4, a control unit 5, and an input receiving unit 6.

[0020] (2.1) First lighting device (lighting device) 1, first lighting device 1 has a plurality of first light-emitting elements 12 and a first light distribution control member (light distribution control member) 13. As shown in FIG. 2, first lighting device 1 irradiates first illumination light 101 onto irradiation surface S1.

[0021] Each of the plurality of first light-emitting elements 12 is, for example, one of four types of light-emitting diodes (hereinafter referred to as "LEDs") that emit light of different colors (e.g., red, green, blue, and white). As shown in FIG. 7, the plurality of first light-emitting elements 12 are arranged (mounted) at equal intervals along the longitudinal direction of the substrate 11 (the up-and-down direction in FIG. 7) on a first main surface 111 of the substrate 11 described below. It is preferable that two or more LEDs of the same color among the plurality of first light-emitting elements 12 are electrically connected in series. Hereinafter, two or more LEDs of the same color among the plurality of first light-emitting elements 12 may be referred to as an LED module.

[0022] First light distribution control member 13 is located in front of multiple first light-emitting elements 12 (upper in FIG. 5). First light distribution control member 13 includes lens 132 (see FIG. 5), which will be described later. Lens 132 is, for example, a condensing lens, and more specifically, a linear Fresnel lens. Therefore, the light emitted from multiple first light-emitting elements 12 is condensed and mixed by lens 132, becoming light (first illumination light 101) with a light color that corresponds to the ratio of the light intensity of each LED module.

[0023] (2.2) Second lighting device As shown in Fig. 1, second lighting device 2 has a plurality of second light-emitting elements 21 and second light distribution control member 22. As shown in Fig. 2, second lighting device 2 irradiates illumination surface S1 with second illumination light 102. Furthermore, in second lighting device 2, second light distribution control member 22 includes a diffusion sheet, as will be described later, and has a wider light distribution angle than first light distribution control member 13 including lens 132. In other words, second lighting device 2 has a wider light distribution angle than first lighting device 1.

[0024] Each of the second light-emitting elements 21 is one of four types of LEDs (e.g., red, green, blue, and white) that emit light in different colors, similar to the first light-emitting elements 12. The second light-emitting elements 21 are, for example, arranged (mounted) at equal intervals along the longitudinal direction of the substrate on one main surface of the substrate, similar to the first light-emitting elements 12. It is preferable that two or more LEDs of the same color among the second light-emitting elements 21 are electrically connected in series. Hereinafter, two or more LEDs of the same color among the second light-emitting elements 21 may be referred to as an LED module.

[0025] Second light distribution control member 22 is located in front of the plurality of second light-emitting elements 21. Second light distribution control member 22 includes, for example, a diffusion sheet. The diffusion sheet is formed of a translucent synthetic resin such as acrylic resin or polycarbonate resin. Therefore, the light emitted from the plurality of second light-emitting elements 21 is diffused and mixed by the diffusion sheet, becoming light (second illumination light 102) with a light color according to the ratio of the light intensity of each LED module. Note that second light distribution control member 22 may further include a lens unit. It is preferable that the lens unit includes a plurality of lenses that correspond one-to-one to the plurality of second light-emitting elements 21.

[0026] In the lighting system 10 according to the embodiment, it is preferable that the light color of the first lighting light 101 emitted from the first lighting device 1 is different from the light color of the second lighting light 102 emitted from the second lighting device 2. As an example, the light color of the first lighting light 101 is pale blue-green, and the light color of the second lighting light 102 is bluish white. Furthermore, in the lighting system 10 according to the embodiment, it is preferable that the saturation of the first lighting light 101 is higher than the saturation of the second lighting light 102.

[0027] (2.3) First drive unit The first driving unit 3 includes, for example, a power conversion circuit that converts AC power supplied from a commercial power grid into DC power, and four constant current circuits that correspond one-to-one to the four LED modules of the first lighting device 1.

[0028] The power conversion circuit includes, for example, a full-wave rectifier circuit, a boost chopper circuit, a smoothing capacitor, etc. The full-wave rectifier circuit is, for example, made up of a diode bridge. The power conversion circuit converts AC voltage input from the power grid (for example, AC voltage with a power supply frequency of 60 Hz and an effective value of 100 V) into DC voltage that is higher than the peak voltage of the AC voltage.

[0029] Each of the four constant current circuits includes, for example, a buck converter. The buck converter is, for example, a step-down chopper circuit. Each constant current circuit operates to step down the DC voltage output from the power conversion circuit using the buck converter and adjust the output current supplied to the corresponding LED module to match a target current value. For example, each constant current circuit may receive a digital signal conforming to the DMX (Digital Multiplex) 512 communication protocol from the control unit 5 and control the buck converter in accordance with this digital signal. Alternatively, each constant current circuit may perform PWM (Pulse Width Modulation) control of the buck converter in accordance with the light intensity target value and light color target value provided by the control unit 5.

[0030] The first driving unit 3 is electrically connected to the first lighting device 1 via, for example, four electric cables. The four electric cables electrically connect the output terminals of the four constant current circuits of the first driving unit 3 to the input terminals of the four LED modules of the first lighting device 1.

[0031] (2.4) Second drive unit The second drive unit 4, like the first drive unit 3, has a power conversion circuit that converts AC power supplied from a commercial power system into DC power, and four constant current circuits. The power conversion circuit and four constant current circuits of the second drive unit 4 have the same circuit configuration as the power conversion circuit and four constant current circuits of the first drive unit 3, and therefore a description thereof will be omitted here.

[0032] The second driving unit 4 is electrically connected to the second lighting device 2 via, for example, four electric cables. The four electric cables electrically connect the output terminals of the four constant current circuits of the second driving unit 4 to the input terminals of the four LED modules of the second lighting device 2.

[0033] (2.5) Control Unit The control unit 5 mainly comprises a computer system having one or more processors and one or more memories. In the lighting system 10, the one or more processors execute a program recorded in the memory, thereby realizing the functions of the control unit 5. The program may be pre-recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be provided by being recorded on a non-transitory recording medium such as a memory card.

[0034] The control unit 5 controls the first illumination device 1 and the second illumination device 2. More specifically, the control unit 5 controls the light intensity and light color of the first illumination light 101 emitted from the first illumination device 1 and the light intensity and light color of the second illumination light 102 emitted from the second illumination device 2. More specifically, the control unit 5 controls the light intensity and light color of the first illumination light 101 by providing a first light intensity target value and a first light color target value to the first drive unit 3. Furthermore, the control unit 5 controls the light intensity and light color of the second illumination light 102 by providing a second light intensity target value and a second light color target value to the second drive unit 4.

[0035] Here, the first illumination light 101 is converted from the first light intensity target value and the first light color target value into dimming values ​​for the four LED modules, and then converted into target current values ​​for the four constant current circuits. Therefore, the control unit 5 provides the target current values ​​for each constant current circuit to the first drive unit 3 as the first light intensity target value and the first light color target value.

[0036] The second illumination light 102 is converted from the second light intensity target value and the second light color target value into dimming values ​​for the four LED modules, and then converted into target current values ​​for the four constant current circuits. Therefore, the control unit 5 provides the target current values ​​for each constant current circuit to the second drive unit 4 as the second light intensity target value and the second light color target value.

[0037] However, when the constant current circuit is PWM controlled, the control unit 5 may convert the average value per unit time of the output current of the constant current circuit into the PWM control duty ratio required to match each target current value, and provide this duty ratio to the first drive unit 3 and the second drive unit 4.

[0038] (2.6) Input reception section The input receiving unit 6 receives input specifying the first light intensity target value and the first light color target value described above. The input receiving unit 6 also receives input specifying the second light intensity target value and the second light color target value described above.

[0039] The input receiving unit 6 is configured, for example, by a computer system. The computer system may be, for example, a desktop or notebook personal computer, or a tablet terminal having an input device such as a touch panel mounted on a flat housing.

[0040] The input receiving unit 6, for example, displays a chromaticity diagram (e.g., an xy chromaticity diagram of the XYZ color system) on a monitor screen, and receives an arbitrary chromaticity point selected with a mouse pointer, a touch pen, or a fingertip on the chromaticity diagram displayed on the monitor screen as an input specifying a light color target value (first light color target value, second light color target value). The input receiving unit 6 also displays a GUI (Graphical User Interface) such as a fader or slider on the monitor screen, and receives an arbitrary numerical value selected by operating the GUI with a mouse pointer, a touch pen, or a fingertip as an input specifying a light intensity target value (first light intensity target value, second light intensity target value).

[0041] The input receiving unit 6 complies with a communication protocol such as DMX512 and is connected to the control unit 5 via a communication line so as to be able to communicate bidirectionally with the control unit 5. The input receiving unit 6 transmits the received input information (for example, x and y coordinates of a selected chromaticity point, numerical values ​​of a fader, etc.) to the control unit 5 via the communication line.

[0042] (3) Structure of the first lighting device (lighting device) Next, the structure of the first lighting device (lighting device) 1 will be described with reference to FIGS.

[0043] 3 to 7, lighting device 1 includes substrate 11, a plurality of first light-emitting elements (light-emitting elements) 12, and first light distribution control member (light distribution control member) 13. In addition, lighting device 1 further includes first case 23 and second case 24.

[0044] (3.1) Substrate The substrate 11 is, for example, a printed wiring board. The substrate 11 is formed in an elongated shape that is long in a first direction D1 (left-right direction). More specifically, the substrate 11 is formed in a flat plate shape that is long in the first direction D1. Therefore, the shape of the substrate 11 in a plan view from a second direction D2 (up-down direction), which is the thickness direction of the substrate 11, is a rectangular shape that is long in the first direction D1 (see FIG. 7). The substrate 11 has a first main surface 111 and a second main surface 112. The first main surface 111 and the second main surface 112 face each other in the second direction D2, which is the thickness direction of the substrate 11.

[0045] (3.2) First Light-Emitting Element Plural first light-emitting elements 12 are arranged along first direction D1 on first main surface 111 of substrate 11. More specifically, plural first light-emitting elements 12 are arranged (mounted) at equal intervals along central axis A3 of first light distribution control member 13, which will be described later, in first direction D1, as shown in FIG. 7 . In the example of FIG. 7 , central axis A3 of first light distribution control member 13 in first direction D1 overlaps with plural first light-emitting elements (light-emitting elements) 12 in plan view from second direction D2 (a direction perpendicular to the paper surface of FIG. 7 ). Here, "central axis A3 of first light distribution control member 13" is the central axis of first light distribution control member 13 that is along first direction D1, which is the longitudinal direction of first light distribution control member 13.

[0046] (3.3) First light distribution control member First light distribution control member 13 has base plate 131 and lens 132. First light distribution control member 13 is a member for controlling the distribution of light emitted from multiple first light-emitting elements 12 arranged on first main surface 111 of substrate 11. As shown in Fig. 4, first light distribution control member 13 is formed in an elongated shape that is long in first direction D1. First light distribution control member 13 is formed of, for example, a synthetic resin such as an acrylic resin or a polycarbonate resin.

[0047] The base plate 131 is formed, for example, in the shape of a flat plate that is long in the first direction D1. The base plate 131 has a first main surface 1311 and a second main surface 1312. The first main surface 1311 and the second main surface 1312 face each other in the thickness direction of the base plate 131 (second direction D2).

[0048] The lens 132 is formed on the first main surface 1311 of the base plate 131. The lens 132 is, for example, a condensing lens, and more specifically, a linear Fresnel lens. The lens 132 is formed in an elongated shape that is long in the first direction D1. The lens 132 may include a lens other than a condensing lens (linear Fresnel lens). The lens 132 may also include a condensing lens other than a linear Fresnel lens. As shown in FIGS. 5 and 6 , the optical axis A2 of the lens 132 passes through a center point P2 of the incident surface 133 of the lens 132 and is perpendicular to the second main surface 1312 of the base plate 131.

[0049] Furthermore, in lighting device 1 according to this embodiment, first luminous intensity distribution control member 13 controls the luminous intensity distribution of the light emitted from multiple first light-emitting elements 12 so that the half beam angle of the light is 20 degrees or less. The positional relationship between each first light-emitting element 12 and first luminous intensity distribution control member 13 will be described in the section "(4) Positional relationship between first light-emitting element and first luminous intensity distribution control member."

[0050] (3.4) First case As shown in FIG. 4, the first case 23 has a body 14, a first cover 18, and a pair of second covers 19.

[0051] The body 14 is formed into a hollow cylindrical shape using, for example, an extruded material of aluminum or an aluminum alloy. One surface (top surface) of the body 14 is open. Furthermore, a pair of holding grooves 141 (see FIG. 5) for holding the above-mentioned substrate 11 is provided at the upper end of the inner surface of the body 14. Therefore, the substrate 11 is held in the body 14 by inserting both ends of the substrate 11 in the short side direction (third direction D3) into the pair of holding grooves 141. When the substrate 11 is held in the body 14, the first main surface 111 of the substrate 11 faces the opening surface of the body 14. Furthermore, the above-mentioned first drive unit 3 is housed below the substrate 11 in the internal space of the body 14.

[0052] The first cover 18 is made of a synthetic resin such as acrylic resin or polycarbonate resin. The first cover 18 is formed in an elongated shape that is long in the first direction D1. When viewed from above in the first direction D1, the first cover 18 has an arc shape that is convex upward. The first cover 18 is attached to the body 14 so as to close the opening of the body 14. When the first cover 18 is attached to the body 14, the first main surface 111 of the substrate 11 and the inner surface of the first cover 18 face each other. Therefore, light emitted from the multiple first light-emitting elements 12 passes through the first cover 18 and is emitted to the outside of the first case 23.

[0053] Each of the pair of second covers 19 is formed into a flat plate shape from aluminum or an aluminum alloy, similar to the body 14. The pair of second covers 19 are screwed to both ends of the body 14 in the longitudinal direction (first direction D1).

[0054] (3.5) Second Case As shown in FIG. 4, the second case 24 has a first body 15, a second body 16, and a cover 17.

[0055] The first body 15 is formed, for example, from a metal plate in an elongated shape that is long in the first direction D1. The first body 15 includes a side wall portion 151 and a holding portion 152. The side wall portion 151 is formed in a flat plate shape that is long in the first direction D1. The holding portion 152 includes a first piece 153, a second piece 154, a third piece 155, a fourth piece 156, and a fifth piece 157. The first piece 153 protrudes rearward from the upper end of the side wall portion 151. The second piece 154 protrudes upward from the rear end of the first piece 153. The third piece 155 protrudes forward from the upper end of the second piece 154. The fourth piece 156 protrudes upward from the front end of the third piece 155. The fifth piece 157 protrudes rearward from the upper end of the fourth piece 156. Therefore, the shape of the holding portion 152 in a plan view from the first direction D1 is an inverted S-shape. Here, in the first body 15, a first holding groove 158 is formed by the first piece 153, the second piece 154, and the third piece 155. Also, in the first body 15, a second holding groove 159 is formed by the third piece 155, the fourth piece 156, and the fifth piece 157.

[0056] Like the first body 15, the second body 16 is formed, for example, from a metal plate in an elongated shape that is long in the first direction D1. The second body 16 includes a side wall portion 161 and a holding portion 162. The side wall portion 161 is formed in a flat plate shape that is long in the first direction D1. The holding portion 162 includes a first piece 163, a second piece 164, a third piece 165, a fourth piece 166, and a fifth piece 167. The first piece 163 protrudes forward from the upper end of the side wall portion 161. The second piece 164 protrudes upward from the front end of the first piece 163. The third piece 165 protrudes rearward from the upper end of the second piece 164. The fourth piece 166 protrudes upward from the rear end of the third piece 165. The fifth piece 167 protrudes forward from the upper end of the fourth piece 166. Therefore, the shape of the holding portion 162 in a plan view from the first direction D1 is S-shaped. Here, in the second body 16, a first holding groove 168 is formed by the first piece 163, the second piece 164, and the third piece 165. Also, in the second body 16, a second holding groove 169 is formed by the third piece 165, the fourth piece 166, and the fifth piece 167.

[0057] The pair of first holding grooves 158, 168 are grooves for holding cover 17, which will be described later, and second pieces 174 of a pair of mounting portions 172 of cover 17 are inserted into them, respectively. The pair of second holding grooves 159, 169 are grooves for holding first light distribution control member 13 described above, and both ends in the short side direction (third direction D3) of base plate 131 of first light distribution control member 13 are inserted into them, respectively.

[0058] First body 15 and second body 16 are attached to support base 20 (see FIG. 2 ) by an appropriate fixing method (for example, screw fixing) with a predetermined gap between them in third direction D3. Here, the lengths of side wall portion 151 of first body 15 and side wall portion 161 of second body 16 are determined so that, with first body 15 and second body 16 attached to support base 20, second main surface 1312 of base plate 131 of first light distribution control member 13 held by first body 15 and second body 16 faces irradiation surface S1. More specifically, length H4 of side wall portion 151 of first body 15 in second direction D2 is longer than length H5 of side wall portion 161 of second body 16 in second direction D2.

[0059] The cover 17 is made of a synthetic resin such as acrylic resin or polycarbonate resin. The cover 17 includes a main portion 171 and a pair of mounting portions 172. The main portion 171 is formed in the shape of a flat plate that is long in the first direction D1. Each of the pair of mounting portions 172 includes a first piece 173 and a second piece 174. The first piece 173 protrudes downward from the front end or the rear end of the main portion 171. The second piece 174 protrudes forward or rearward from the lower end of the first piece 173. Therefore, the shape of each mounting portion 172 in a plan view from the first direction D1 is L-shaped or inverted L-shaped.

[0060] In the lighting device 1 according to this embodiment, the cover 17 is attached to the first body 15 and the second body 16 by sliding the cover 17 from the first direction D1 relative to the first body 15 and the second body 16 attached to the support base 20. When the cover 17 is attached to the first body 15 and the second body 16, the second piece 174 of one mounting portion 172 (the right side in FIG. 5) is inserted into the first holding groove 158 of the first body 15, and the second piece 174 of the other mounting portion 172 (the left side in FIG. 5) is inserted into the first holding groove 168 of the second body 16.

[0061] (4) Positional relationship between the first light-emitting element and the first light distribution control member Next, the positional relationship between first light-emitting element 12 and first luminous intensity distribution control member 13 will be described with reference to FIGS.

[0062] 5 and 6, the optical axis A1 of the first light-emitting element 12 disposed on the substrate 11 is parallel to the second direction D2 (vertical direction). Here, the optical axis A1 of the first light-emitting element 12 is a virtual axis that passes through the center point P1 of the light-emitting surface 121 of the first light-emitting element 12 and is parallel to the normal direction of the light-emitting surface 121.

[0063] On the other hand, as described above, length H5 of side wall portion 161 of second body 16 in second direction D2 is shorter than length H4 of side wall portion 151 of first body 15 in second direction D2, and therefore optical axis A2 of first luminous intensity distribution control member 13 is inclined toward irradiation surface S1 with respect to optical axis A1 of first light-emitting element 12. Here, optical axis A2 of first luminous intensity distribution control member 13 is a virtual axis that passes through center point P2 of incident surface 133 of lens 132 and is parallel to the normal direction of the emission surface (second main surface 1312 of base plate 131).

[0064] As described above, in first lighting device 1, optical axis A2 of first luminous intensity distribution control member 13 is inclined toward irradiation surface S1 with respect to optical axis A1 of first light-emitting element 12, and first luminous intensity distribution control member 13 includes a condensing lens (lens 132). Therefore, the light distribution characteristic of first lighting device 1 is a narrow-angle light distribution characteristic inclined (by 10 degrees in FIG. 8) toward irradiation surface S1 in the vertical direction (up-down direction). On the other hand, in second lighting device 2, emission surface 200 of second illumination light 102 faces upward (see FIG. 2), and second luminous intensity distribution control member 22 includes a diffusion sheet. Therefore, the light distribution characteristic of second lighting device 2 is a wide-angle light distribution characteristic as shown in FIG. 9. Note that in FIG. 8, K1 is the light distribution curve in the vertical direction (up-down direction), and K2 is the light distribution curve in the horizontal direction (left-right direction). In addition, in FIG. 9, K3 is a light distribution curve in the vertical direction (up and down direction), and K4 is a light distribution curve in the horizontal direction (left and right direction).

[0065] 10 is an explanatory diagram illustrating the positional relationship between first light-emitting element 12 and first light distribution control member 13. In FIG. 10, "W1" is the length (width) of first light-emitting element 12 in third direction D3, and "H1" is the thickness of first light-emitting element 12. Also in FIG. 10, "θ11, θ12 (θ1)" is the angle between optical axis A1 of first light-emitting element 12 and optical axis A2 of first light distribution control member 13, and "d1" is the displacement of incident surface 133 of first light distribution control member 13 in third direction D3. Also in FIG. 10, "L1" is the distance between emission surface 121 of first light-emitting element 12 and incident surface 133 of first light distribution control member 13 in second direction D2.

[0066] As an example, let us assume that the length W1 is 3 mm and the distance L1 is 13.5 mm. The displacement d1 in this case is shown in Table 1.

[0067] [Table 1]

[0068] Here, displacement d1 is preferably equal to or less than half the length W1 of first light-emitting element 12, and more specifically, is preferably equal to or less than 1.5 mm. Furthermore, considering the incidence efficiency, it is preferable that distance L1 between first light-emitting element 12 and first light distribution control member 13 in second direction D2 be short. However, when first light distribution control member 13 is tilted with respect to first light-emitting element 12, as in lighting device 1 according to this embodiment, a small distance L1 also reduces displacement d1, making adjustment difficult. For this reason, for example, when distance L1 is 13.5 mm, displacement d1 is preferably equal to or greater than 1 mm. Therefore, in this case, angle θ1 between optical axis A1 of first light-emitting element 12 and optical axis A2 of first light distribution control member 13 (hereinafter also referred to as "tilt angle θ1") is preferably 6 degrees (see Table 1). When displacement d1 is equal to or greater than 1 mm and tilt angle θ1 is 6 degrees, distance L1 is equal to or greater than 9.5 mm. That is, distance L1 between emission surface 121 of first light-emitting element 12 and incident surface 133 of first light distribution control member 13 in second direction D2 is preferably at least 3.17 (=9.5 mm / 3 mm) times length W1 of first light-emitting element 12 in third direction D3. Here, "distance L1 between emission surface 121 of first light-emitting element 12 and incident surface 133 of first light distribution control member 13 in second direction D2" refers to the distance between center points P1 and P2. Center point P1 is the center point of emission surface 121 of first light-emitting element 12 when first light-emitting element 12 is viewed from a direction parallel to optical axis A1 of first light-emitting element 12. Center point P2 is the center point of incident surface 133 of first light distribution control member 13 when first light distribution control member 13 is viewed from a direction parallel to optical axis A2 of first light distribution control member 13.

[0069] Furthermore, FIG. 11 is a graph showing the relationship between distance L1 between emission surface 121 of first light-emitting element 12 and incidence surface 133 of first light distribution control member 13 in second direction D2 and the incidence efficiency. Here, the incidence efficiency is the percentage of the luminous flux incident on irradiation surface S1 relative to the total luminous flux emitted from first lighting device 1. As shown by solid line a1 in FIG. 11, the incidence efficiency decreases as distance L1 increases. When angle θ1 between optical axis A1 of first light-emitting element 12 and optical axis A2 of first light distribution control member 13, i.e., tilt angle θ1, is 0 degrees, the incidence efficiency is 10.2%. Therefore, when tilt angle θ1 is greater than 0 degrees, the incidence efficiency needs to be 10.2% or more, and distance L1 needs to be 21 mm or less. In other words, distance L1 needs to be 7 (= 21 mm / 3 mm) times or less the length W1 of first light-emitting element 12 in third direction D3.

[0070] In short, in the lighting device 1 according to the embodiment, it is preferable that the distance L1 between the exit surface 121 of each of the plurality of first light-emitting elements 12 in the second direction D2 and the entrance surface 133 of the first light distribution control member 13 is 3.17 times or more and 7 times or less the length W1 of each of the plurality of light-emitting elements 12 in the third direction D3.

[0071] (5) Installation status of lighting system Next, the installation state of the lighting system 10 according to the embodiment will be described with reference to FIG.

[0072] As shown in FIG. 2, the lighting system 10 is installed on an installation stand 7 provided below an irradiation surface S1. The irradiation surface S1 is, for example, the surface (front surface) of a partition 400 that forms the workspace WS1. A lighting fixture 9 for illuminating the workspace WS1 is attached to the ceiling surface of the workspace WS1. In the example of FIG. 2, the lighting fixture 9 is a ceiling-mounted lighting fixture, but it may also be a ceiling-embedded lighting fixture. The lighting fixture 9 irradiates the workspace WS1 with third illumination light 103, which has a light color different from the first illumination light 101 and the second illumination light 102.

[0073] The installation table 7 has a bottom plate 70, a front plate 71, a rear plate 72, and a pair of side plates 73. The bottom plate 70 is flat and disposed perpendicular to the irradiation surface S1. The front plate 71, like the bottom plate 70, is flat and protrudes upward from one end (front end) of the bottom plate 70 in the front-rear direction (third direction D3). The rear plate 72, like the bottom plate 70, is flat and protrudes upward from the other end (rear end) of the bottom plate 70 in the front-rear direction (third direction D3). The pair of side plates 73 protrude upward from both ends of the bottom plate 70 in the left-right direction (first direction D1). In other words, the installation table 7 is formed in the shape of a long box with an open top of the bottom plate 70. Note that one of the pair of side plates 73 (the side on the near side of FIG. 2) is not shown in FIG. 2. The bottom plate 70, the front plate 71, the rear plate 72 and the pair of side plates 73 are preferably made of any one of metal, wood or synthetic resin plates.

[0074] The first lighting device 1 is installed in the internal space of the installation stand 7 (a space surrounded by a bottom plate 70, a front plate 71, a rear plate 72, and a pair of side plates 73). More specifically, the first lighting device 1 is fixed to the pair of side plates 73 in the internal space of the installation stand 7, for example, so that an emission surface 100 of the first illumination light 101 faces upward. Furthermore, the optical axis A2 (see FIG. 5) of the first light distribution control member 13 is oriented toward the irradiation surface S1 with respect to the optical axis A1 (see FIG. 5) of the first light-emitting element 12 so that the first illumination light 101 emitted from the first lighting device 1 is irradiated toward the irradiation surface S1. In this way, the first lighting device 1 is located between the installation surface S2 on which the electrical device 8 is placed and the irradiation surface S1 in the third direction D3, which is the normal direction to the irradiation surface S1.

[0075] The second illumination device 2 is fixed to a pair of side plates 73 in the internal space of the installation stand 7, for example, with the emission surface 200 of the second illumination light 102 facing upward. The second illumination device 2 is installed in the internal space of the installation stand 7 at a position closer to the irradiation surface S1 than the first illumination device 1. That is, in the example of FIG. 2, in the normal direction (third direction D3) of the irradiation surface S1, the distance L21 from the second illumination device 2 to the irradiation surface S1 is shorter than the distance L11 from the first illumination device 1 to the irradiation surface S1. In other words, the first illumination device 1 and the second illumination device 2 are arranged in the front-rear direction (third direction D3) in the order of the first illumination device 1 and the second illumination device 2 from the front. Here, the "distance L11 from the first illumination device 1 to the irradiation surface S1 in the normal direction (third direction D3) of the irradiation surface S1" is the distance from the center point P1 of the emission surface 121 of the first light-emitting element 12 to the irradiation surface S1. Furthermore, "the distance L21 from the second lighting device 2 to the irradiation surface S1 in the normal direction (third direction D3) of the irradiation surface S1" is the distance from the center point of the emission surface of the second light-emitting element 21 to the irradiation surface S1.

[0076] Incidentally, in the first lighting device 1, the exit surface 100 of the first illumination light 101 is located below the upper end of the front panel 71 in the vertical direction (second direction D2), as shown in Fig. 2. In the second lighting device 2, the exit surface 200 of the second illumination light 102 is located below the upper end of the front panel 71 in the vertical direction (second direction D2), as shown in Fig. 2. Therefore, the forward-directed light of the first illumination light 101 and the second illumination light 102 is blocked by the front panel 71 of the installation stand 7 and is not directly visible to the worker 300 who is working with the electrical device 8 placed on the placement surface S2. As a result, it is possible to suppress glare caused by the first illumination light 101 and the second illumination light 102.

[0077] In the lighting system 10 according to the embodiment, as shown in FIG. 2, the exit surface 100 of the first lighting device 1, from which the first illumination light 101 is emitted, is located higher than the exit surface 200 of the second lighting device 2, from which the second illumination light 102 is emitted, in the up-down direction (second direction D2). More specifically, the height H11 of the first lighting device 1 is higher than the height H21 of the second lighting device 2. This makes it possible to prevent a portion of the first illumination light 101 from being blocked by the second lighting device 2, which is located closer to the irradiation surface S1 than the first lighting device 1. Here, as shown in FIG. 2, the height H1 of the first lighting device 1 is determined based on the lowest position of the exit surface 100. Therefore, in the example of FIG. 2, the entire exit surface 100 of the first lighting device 1 is located higher than the exit surface 200 of the second lighting device 2.

[0078] (6) Irradiation area of ​​the irradiated surface Next, the first irradiation region R1 and the second irradiation region R2 formed on the irradiation surface S1 will be described with reference to FIG.

[0079] In the lighting system 10 according to the embodiment, a first illumination light 101 emitted from the first lighting device 1 is irradiated onto the illumination surface S1, thereby forming a first illumination region R1 on the illumination surface S1. Furthermore, in the lighting system 10 according to the embodiment, a second illumination light 102 emitted from the second lighting device 2 is irradiated onto the illumination surface S1, thereby forming a second illumination region R2 on the illumination surface S1. The term "first illumination region R1" used in the present disclosure refers to a region on the illumination surface S1 irradiated with the first illumination light 101 when only the first lighting device 1 of the first lighting device 1 and the second lighting device 2 is turned on, where the region has a brightness of 30% or more of the maximum brightness. Furthermore, the term "second illumination region R2" used in the present disclosure refers to a region on the illumination surface S1 irradiated with the second illumination light 102 when only the second lighting device 2 of the first lighting device 1 and the second lighting device 2 is turned on, where the region has a brightness of 30% or more of the maximum brightness. For example, in the right graph of the two graphs in Fig. 12, the range to the left of the first threshold value Th1 is the range where the luminance is 30% or more of the maximum luminance, and the upper and lower limit positions of the first illumination region R1 in the vertical direction (second direction D2) are determined from this graph. Also, in the left graph of the two graphs in Fig. 12, the range to the left of the second threshold value Th2 is the range where the luminance is 30% or more of the maximum luminance, and the upper and lower limit positions of the second illumination region R2 in the vertical direction (second direction D2) are determined from this graph. Also, when the electrical device 8 is placed on the placement surface S2, a part (lower part) of the display screen 81 of the electrical device 8 overlaps with the first illumination region R1 when the display screen 81 and the irradiation surface S1 of the electrical device 8 are viewed from the front (see Fig. 12).

[0080] Table 2 shows the maximum illuminance, minimum illuminance, height of the condensed illumination area, incidence efficiency, and uniformity of first illumination area R1 when the angle θ1 between optical axis A1 of first light-emitting element 12 and optical axis A2 of first luminous intensity distribution control member 13 is changed. The minimum illuminance is 1 / 3 of the maximum illuminance in first illumination area R1. The height of the condensed illumination area is the height of first illumination area R1 (the length in second direction D2). In this embodiment, the uniformity is defined as the ratio of the average illuminance to the maximum illuminance.

[0081] [Table 2]

[0082] In Table 2, when the tilt angle θ1 is 3 degrees, 6 degrees, 9 degrees, or 12 degrees, both the maximum illuminance and the minimum illuminance are higher than when the tilt angle θ1 is 0 degrees. Also, in Table 2, when the tilt angle θ1 is 3 degrees, 6 degrees, 9 degrees, or 12 degrees, the height of the concentrated irradiation area is larger than when the tilt angle θ1 is 0 degrees. Also, in Table 2, when the tilt angle θ1 is 3 degrees, 6 degrees, 9 degrees, or 12 degrees, the incidence efficiency is higher than when the tilt angle is 0 degrees. Also, in Table 2, when the tilt angle θ1 is 3 degrees, 6 degrees, 9 degrees, or 12 degrees, the uniformity is higher than when the tilt angle is 0 degrees. That is, in the lighting device 1 according to this embodiment, the angle (tilt angle) θ1 formed between the optical axis A1 of the plurality of first light-emitting elements 12 and the optical axis A2 of the first light distribution control member 13 is preferably greater than 0 degrees and equal to or less than 12 degrees.

[0083] (7) Relationship between the positions of the first and second lighting devices and the illuminance gradient on the illuminated surface Next, the relationship between the positions of the first illumination device 1 and the second illumination device 2 in the third direction D3 and the illuminance gradient on the illumination surface S1 will be described with reference to FIGS.

[0084] "L31" in Fig. 13 is the inner dimension of the installation stand 7 in the third direction D3. "L32" in Fig. 13 is the length (width) of the first lighting device 1 and the second lighting device 2 in the third direction D3. "L33" in Fig. 13 is the gap between the first lighting device 1 and the second lighting device 2 in the third direction D3. "L34" in Fig. 13 is the distance from the inner surface of the installation stand 7 to the center of the first lighting device 1 in the third direction D3. Furthermore, the vertical axis in Figs. 14 and 15 is the height position (mm) of the irradiation surface S1, and the horizontal axis in Figs. 14 and 15 is the illuminance (lx) of the irradiation surface S1.

[0085] First, assume that the inner dimension L31 is 200 mm, the length L32 is 60 mm, the gap L33 is 20 mm, and the distance L34 is 130 mm (hereinafter referred to as "Example 1"). In Example 1, the illuminance gradient on irradiated surface S1 varies depending on the magnitude of angle θ1 (hereinafter also referred to as "tilt angle θ1") between optical axis A1 of first light-emitting element 12 and optical axis A2 of first light distribution control member 13, as shown in FIG. 14. For example, when tilt angle θ1 is 0 degrees, the luminance on irradiated surface S1 varies along dotted line b5 depending on the height position of irradiated surface S1. When tilt angle θ1 is 3 degrees, the luminance on irradiated surface S1 varies along dashed-dotted line b2 depending on the height position of irradiated surface S1. When tilt angle θ1 is 6 degrees, the luminance on irradiated surface S1 varies along solid line b1 depending on the height position of irradiated surface S1. Furthermore, when the tilt angle θ1 is 9 degrees, the luminance of the irradiated surface S1 varies along the two-dot chain line b3 depending on the height position of the irradiated surface S1. Furthermore, when the tilt angle θ1 is 12 degrees, the luminance of the irradiated surface S1 varies along the dotted line b4 depending on the height position of the irradiated surface S1. In the first example, the illuminance gradient on the irradiated surface S1 by the first lighting device 1 and the second lighting device 2 is smoothest when the tilt angle θ1 is 6 degrees.

[0086] Next, assume that the inner dimension L31 is 200 mm, the length L32 is 60 mm, the gap L33 is 20 mm, and the distance L34 is 170 mm (hereinafter referred to as "Example 2"). In Example 2, the illuminance gradient of the irradiated surface S1 varies depending on the magnitude of the tilt angle θ1, as in Example 1 (see FIG. 15). For example, when the tilt angle θ1 is 0 degrees, the luminance of the irradiated surface S1 varies along the dotted line c5 depending on the height position of the irradiated surface S1. When the tilt angle θ1 is 3 degrees, the luminance of the irradiated surface S1 varies along the dashed-dotted line c2 depending on the height position of the irradiated surface S1. When the tilt angle θ1 is 6 degrees, the luminance of the irradiated surface S1 varies along the solid line c1 depending on the height position of the irradiated surface S1. When the tilt angle θ1 is 9 degrees, the luminance of the irradiated surface S1 varies along the dashed-dotted line c3 depending on the height position of the irradiated surface S1. Furthermore, when the tilt angle θ1 is 12 degrees, the luminance of the illuminated surface S1 varies along the dotted line c4 depending on the height position of the illuminated surface S1. In the second example, the illuminance gradient on the illuminated surface S1 by the first lighting device 1 and the second lighting device 2 is smoothest when the tilt angle θ1 is 6 degrees, as in the first example.

[0087] In this way, when the first lighting device 1 and the second lighting device 2 illuminate the irradiation surface S1, the illuminance gradient on the irradiation surface S1 is smoothest when the inclination angle θ1 is 6 degrees, regardless of the positions of the first lighting device 1 and the second lighting device 2 in the third direction D3.

[0088] (8) Effects In lighting device 1 according to the embodiment, distance L1 in second direction D2 between emission surface 121 of each of multiple first light-emitting elements 12 and incidence surface 133 of first light distribution control member 13 is 3.17 to 7 times the length W1 of each of multiple light-emitting elements 12 in third direction D3. Furthermore, in lighting device 1 according to the embodiment, angle θ1 between optical axis A1 of each of multiple first light-emitting elements 12 and optical axis A2 of first light distribution control member 13 is 12 degrees or less. Therefore, it is possible to adjust the light distribution simply by adjusting the position and angle of first light distribution control member 13 relative to multiple first light-emitting elements 12 within the above range. That is, lighting device 1 according to the embodiment allows for easier adjustment of the light distribution than adjusting the position and angle of the entire lighting device.

[0089] Furthermore, in lighting device 1 according to this embodiment, in a plan view from second direction D2, central axis A3 of first luminous intensity distribution control member 13 in first direction D1 overlaps with multiple first light-emitting elements 12. Therefore, by rotating first luminous intensity distribution control member 13 about central axis A3 of first luminous intensity distribution control member 13 as the center of rotation, it is possible to control the light distribution on irradiation surface S1.

[0090] Furthermore, in the lighting system 10 according to the embodiment, a distance L21 from the second lighting device 2 to the lighting surface S1 in the normal direction (third direction D3) of the lighting surface S1 is shorter than a distance L11 from the first lighting device 1 to the lighting surface S1. Furthermore, in the lighting system 10 according to the embodiment, the second lighting device 2 has a wider light distribution angle than the first lighting device 1. This makes it possible to realize beautiful gradation lighting by the first lighting light 101 from the first lighting device 1 and the second lighting light 102 from the second lighting device 2.

[0091] Furthermore, in the lighting system 10 according to the embodiment, the light color of the first lighting light 101 is different from the light color of the second lighting light 102. This makes it possible to realize gradation lighting that makes the colors of the first lighting light 101 and the second lighting light 102 appear stronger.

[0092] Furthermore, in the lighting system 10 according to this embodiment, the saturation of the first lighting light 101 is higher than the saturation of the second lighting light 102. This makes it possible to achieve gradation lighting that makes the color of the first lighting light 101 appear more pronounced.

[0093] In the lighting system 10 according to the embodiment, the exit surface 100 of the first lighting device 1 from which the first illumination light 101 is emitted is located higher than the exit surface 200 of the second lighting device 2 from which the second illumination light 102 is emitted (see FIG. 2). This makes it possible to prevent the first illumination light 101 from being blocked by the second lighting device 2.

[0094] (9) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0095] (9.1) Variation 1 An illumination device 1A according to Modification 1 will be described with reference to Fig. 16A and Fig. 16B. Note that, with respect to illumination device 1A according to Modification 1, the same components as those of illumination device 1 according to the above-described embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

[0096] Illumination device 1A according to Modification 1 differs from illumination device 1 according to the above-described embodiment in that first light distribution control member 13 is adjustable with respect to a plurality of first light-emitting elements 12.

[0097] In addition to the above-mentioned substrate 11, multiple first light-emitting elements 12, first light distribution control member 13, first case 23, and second case 24, lighting device 1A of variant example 1 further includes holding member 25A, rotating shaft 26, and angle adjustment mechanism 27A.

[0098] Holding member 25A is a member for holding first light distribution control member 13. Holding member 25A is rotatably supported by a rotation shaft .

[0099] The rotation shaft 26 is formed in the shape of a round bar that is long in the first direction D1 (the direction perpendicular to the paper surface of FIG. 16A).

[0100] As shown in FIG. 16B, the angle adjustment mechanism 27A has a first circular plate 271 and a second circular plate 272.

[0101] The first circular plate 271 has a first through hole 2711 and a protrusion 2713. The first through hole 2711 penetrates the first circular plate 271 along a first direction D1 (thickness direction of the first circular plate 271). The protrusion 2713 protrudes from a surface 2712 of the first circular plate 271 facing the second circular plate 272 towards the second circular plate 272.

[0102] Second circular plate 272 includes second through hole 2721 and a plurality of recessed grooves 2723. Second through hole 2721 penetrates second circular plate 272 along first direction D1 (thickness direction of second circular plate 272). The plurality of recessed grooves 2723 are provided at equal intervals along the circumferential direction on surface 2722 of second circular plate 272 facing first circular plate 271. Therefore, in lighting device 1A according to modification 1, it is possible to adjust the angle of first light distribution control member 13 with respect to a plurality of first light-emitting elements 12 in a plurality of stages. That is, in lighting device 1A according to modification 1, first light distribution control member 13 is movable with respect to a plurality of first light-emitting elements 12. In short, first light distribution control member 13 is configured to be movable with respect to a plurality of first light-emitting elements 12.

[0103] The first circular plate 271 is fixed to the holding member 25A with the rotating shaft 26 passing through the first through-hole 2711. The second circular plate 272 is fixed to the rotating shaft 26 with the rotating shaft 26 passing through the second through-hole 2721.

[0104] According to the lighting device 1A of the first modification, the tilt angle θ1 can be adjusted simply by rotating the holding member 25A.

[0105] (9.2) Variation 2 17A and 17B, a description will be given of an illumination device 1B according to Modification 2. Note that, with respect to illumination device 1B according to Modification 2, the same components as those of illumination device 1 according to the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.

[0106] Illumination device 1B according to Modification 2 differs from illumination device 1 according to the above-described embodiment in that first luminous intensity distribution control member 13 is adjustable with respect to a plurality of first light-emitting elements 12.

[0107] In addition to the above-mentioned substrate 11, multiple first light-emitting elements 12, first light distribution control member 13, first case 23, and second case 24, lighting device 1B of variant example 2 further includes a holding member 25B, a rotating shaft 26, and an angle adjustment mechanism 27B.

[0108] Holding member 25B is a member for holding first light distribution control member 13. Holding member 25B is rotatably supported by a rotation shaft .

[0109] The rotation shaft 26 is formed in the shape of a round bar that is long in the first direction D1 (the direction perpendicular to the paper surface of FIG. 17A).

[0110] 17B, ​​the angle adjustment mechanism 27B has a snap ring 273. A plurality of notches 2731 are provided along the circumferential direction on the inner peripheral edge of the snap ring 273. The snap ring 273 is fixed to the holding member 25B.

[0111] In lighting device 1B according to Modification 2, the angle of first light distribution control member 13 relative to multiple first light-emitting elements 12 can be adjusted by widening the gap between both ends of snap ring 273 and rotating holding member 25B around rotation axis 26, and then returning the gap between both ends of snap ring 273 to its original position. That is, in lighting device 1B according to Modification 2, first light distribution control member 13 is movable relative to multiple first light-emitting elements 12. In short, first light distribution control member 13 is configured to be movable relative to multiple first light-emitting elements 12.

[0112] According to the lighting device 1B of the second modification, the tilt angle θ1 can be adjusted simply by rotating the holding member 25B.

[0113] (9.3) Other Modifications Other variations are listed below.

[0114] The lighting system 10 of the present disclosure includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The functions of the lighting system 10 of the present disclosure are realized by the processor executing a program stored in the memory of the computer system. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium readable by the computer system, such as a memory card, optical disk, or hard disk drive. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmable after the LSI is manufactured, or logic devices that allow the reconfiguration of internal connections or internal circuit partitions of the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0115] Furthermore, it is not essential for the lighting system 10 that multiple functions are concentrated in one housing, and the components of the lighting system 10 may be distributed across multiple housings. Furthermore, at least some of the functions of the lighting system 10, for example, some of the functions of the control unit 5, may be realized by the cloud (cloud computing) or the like.

[0116] Conversely, in the above-described embodiment, at least some of the functions of the lighting system 10 that are distributed among multiple devices may be integrated into a single housing. For example, some of the functions of the lighting system 10 that are distributed between the first driving unit 3 and the control unit 5 may be integrated into a single housing.

[0117] In the above-described embodiment, the electrical device 8 is a notebook personal computer. However, the electrical device 8 is not limited to a notebook personal computer and may be, for example, a desktop personal computer, a tablet terminal, or a smartphone. Furthermore, the electrical device 8 may be, for example, a television.

[0118] In the above-described embodiment, the first lighting device 1 and the second lighting device 2 are partition lights arranged between the electrical device 8 and the irradiation surface S1 in the third direction D3 (front-rear direction). In contrast, the first lighting device 1 and the second lighting device 2 are not limited to partition lights, and may be lights provided on the back of the electrical device 8 (the surface opposite to the surface on which the display screen 81 is provided), or may be desk lamps, or may be base lights attached to the ceiling surface.

[0119] In the above-described embodiment, each of the first lighting device 1 and the second lighting device 2 has four types of LEDs. However, at least one of the first lighting device 1 and the second lighting device 2 may further have an LED other than the four types of LEDs (for example, a highly saturated blue LED) in addition to the four types of LEDs.

[0120] In the above-described embodiment, first light distribution control member (light distribution control member) 13 includes a linear Fresnel lens (lens 132). However, first light distribution control member 13 may include a plurality of lenses in one-to-one correspondence with a plurality of first light-emitting elements 12, instead of or in addition to the linear Fresnel lens. Furthermore, the linear Fresnel lens (lens 132) may have light diffusibility, or first light distribution control member 13 may further include a diffusion sheet.

[0121] In the above-described embodiment, the input receiving unit 6 receives input specifying the target light intensity value and the target light color value from a chromaticity diagram and a GUI displayed on the monitor screen. Alternatively, the input receiving unit 6 may receive input specifying the target light intensity value and the target light color value from a CUI (Character-based User Interface), such as a physical keyboard or a virtual keyboard displayed on the monitor screen.

[0122] In the above-described embodiment, the illumination surface S1 is not included in the lighting system 10, but the illumination surface S1 may be included in the lighting system 10. That is, the lighting system 10 may further include a member (partition 400) having the illumination surface S1. This makes it possible to provide a lighting system 10 that is integrally provided with the illumination surface S1.

[0123] (Aspect) The present specification discloses the following aspects.

[0124] An illumination device (1; 1A; 1B) according to a first aspect includes a substrate (11), a plurality of light-emitting elements (12), and a light distribution control member (13). The substrate (11) is formed in an elongated shape that is long in a first direction (D1). The plurality of light-emitting elements (12) are arranged along the first direction (D1) on one main surface (111) of the substrate (11). The light distribution control member (13) is formed in an elongated shape that is long in the first direction (D1) and controls the light distribution of light emitted from the plurality of light-emitting elements (12) arranged on the one main surface (111) of the substrate (11). The light distribution control member (13) controls the light distribution so that the half beam angle of the light emitted from the plurality of light-emitting elements (12) is 20 degrees or less. The distance (L1) in the second direction (D2) between the emission surface (121) of each of the plurality of light-emitting elements (12) and the incidence surface (133) of the light distribution control member (13) is 3.17 to 7 times the length (W1) of each of the plurality of light-emitting elements (12) in the third direction (D3). The second direction (D2) is the thickness direction of the substrate (11). The third direction (D3) is a direction perpendicular to both the first direction (D1) and the second direction (D2). The angle (θ1) between the optical axis (A1) of each of the plurality of light-emitting elements (12) and the optical axis (A2) of the light distribution control member (13) is 12 degrees or less.

[0125] According to this aspect, it is possible to adjust the light distribution simply by adjusting the position and angle of the light distribution control member (13) relative to the multiple light-emitting elements (12) within the above range, making it easier to adjust the light distribution than when adjusting the position and angle of the entire lighting device.

[0126] In the lighting device (1) according to the second aspect, in the first aspect, the central axis (A3) of the light distribution control member (13) in the first direction (D1) overlaps with the plurality of light-emitting elements (12) in a plan view from the second direction (D2).

[0127] According to this aspect, by rotating the light distribution control member (13) around the central axis (A3) of the light distribution control member (13) as the center of rotation, it is possible to control the light distribution on the irradiation surface (S1).

[0128] In the lighting device (1A; 1B) according to the third aspect, in the first or second aspect, the light distribution control member (13) is variable with respect to the plurality of light emitting elements (12).

[0129] According to this embodiment, it is possible to finely adjust the angle of the light distribution control member (13) relative to the plurality of light emitting elements (12).

[0130] An illumination system (10) according to a fourth aspect is the illumination device (1) according to the first or second aspect, and includes a first illumination device (1) that irradiates an irradiation surface (S1) with a first illumination light (101) and a second illumination device (2) that irradiates the irradiation surface (S1) with a second illumination light (102). The second illumination device (2) has a wider light distribution angle than the first illumination device (1). In a normal direction (D3) of the irradiation surface (S1), a distance (L21) from the second illumination device (2) to the irradiation surface (S1) is shorter than a distance (L11) from the first illumination device (1) to the irradiation surface (S1).

[0131] According to this aspect, it is possible to realize beautiful gradation illumination by the first illumination light (101) from the first illumination device (1) and the second illumination light (102) from the second illumination device (2).

[0132] In the illumination system (10) according to the fifth aspect, the light color of the first illumination light (101) and the light color of the second illumination light (102) are different from each other in the fourth aspect.

[0133] According to this embodiment, it is possible to realize gradation illumination that makes the color of the first illumination light (101) and the color of the second illumination light (102) appear stronger.

[0134] In the illumination system (10) according to the sixth aspect, in the fourth or fifth aspect, the saturation of the first illumination light (101) is higher than the saturation of the second illumination light (102).

[0135] According to this embodiment, it is possible to realize gradation illumination that gives a strong impression of the color of the first illumination light (101).

[0136] In the lighting system (10) according to the seventh aspect, in any one of the fourth to sixth aspects, when the second direction (D2) is defined as the up-down direction, the emission surface (100) of the first lighting device (1) from which the first illumination light (101) is emitted is located above the emission surface (200) of the second illumination device (2) from which the second illumination light (102) is emitted.

[0137] According to this aspect, it is possible to prevent the first illumination light (101) from being blocked by the second illumination device (2).

[0138] The configurations according to the second and third aspects are not essential for the lighting device (1, 1A, 1B) and can be omitted as appropriate.

[0139] The configurations according to the fifth to seventh aspects are not essential for the lighting system (10) and can be omitted as appropriate. [Explanation of symbols]

[0140] 1,1A,1B 1st lighting device (lighting device) 2. Second lighting device 10. Lighting System 11 Circuit Board 12 First light-emitting element (light-emitting element) 13 First light distribution control member (light distribution control member) 100 Exit surface 101 First illumination light 102 Second illumination light 111 First main surface (first main surface) 121 Exit surface 133 Incidence plane 200 exit surface A1,A2 optical axis A3 center axis D1 1st direction D2 2nd direction D3 Third direction L1,L11,L21 distance S1 irradiation surface W1 length

Claims

1. a substrate formed in an elongated shape that is long in a first direction; a plurality of light-emitting elements arranged along the first direction on one main surface of the substrate; a light distribution control member that is formed in an elongated shape that is long in the first direction and that controls the light distribution of light emitted from the plurality of light-emitting elements that are arranged on the one main surface of the substrate, the light distribution control member controls the light distribution so that a half beam angle of the light emitted from the plurality of light-emitting elements is 20 degrees or less, a distance between an emission surface of each of the plurality of light-emitting elements and an incidence surface of the light distribution control member in a second direction that is a thickness direction of the substrate is 3.17 times or more and 7 times or less a length of each of the plurality of light-emitting elements in a third direction that is orthogonal to both the first direction and the second direction, an angle formed between the optical axis of each of the plurality of light-emitting elements and the optical axis of the light distribution control member is 12 degrees or less; Lighting equipment.

2. In a plan view from the second direction, a central axis of the light distribution control member in the first direction overlaps with the plurality of light-emitting elements. The lighting device according to claim 1 .

3. The angle of the light distribution control member relative to the plurality of light-emitting elements is variable.

3. The lighting device according to claim 1 or 2.

4. 3. The lighting device according to claim 1, further comprising: a first lighting device that irradiates an irradiation surface with first illumination light; a second illumination device that irradiates the illumination surface with second illumination light, the second lighting device has a wider light distribution angle than the first lighting device, a distance from the second lighting device to the irradiation surface in a normal direction of the irradiation surface is shorter than a distance from the first lighting device to the irradiation surface; Lighting system.

5. the light color of the first illumination light is different from the light color of the second illumination light; 5. The lighting system of claim 4.

6. The saturation of the first illumination light is higher than the saturation of the second illumination light.

5. The lighting system of claim 4.

7. When the second direction is defined as an up-down direction, an exit surface of the first illumination device from which the first illumination light is emitted is located higher than an exit surface of the second illumination device from which the second illumination light is emitted.

5. The lighting system of claim 4.

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