Lighting fixture

Abstract

To provide a lighting fixture using a light source comprising a plurality of light source elements with different light emission colors, which light emission colors are sufficiently mixed when light is radiated, and color unevenness on an irradiation surface is suppressed and is unlikely to occur.SOLUTION: A lighting fixture 400 comprises: a light source element group 111 comprising a plurality of light source elements; and a reflection plate 21 that comprises a reflection curve 21c with a focus FR at a position shifted from a light source center LSC of the light source element group 111, and reflects light emitted from the light source element group 111.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a lighting fixture using a light source having a plurality of light source elements with different emission colors. [Background technology]

[0002] Illumination devices (light-emitting devices) that suppress unevenness in light have been used for some time. Patent Document 1 discloses an illumination device that suppresses unevenness in illuminance by using multiple lenses, Patent Document 2 discloses a lighting fixture that suppresses unevenness in illuminance by using a reflector, and Patent Document 3 discloses a light-emitting device that suppresses unevenness in color on a panel display surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-182717 A [Patent Document 2] JP 2014-186978 A [Patent Document 3] JP 2018-069768 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of a lighting fixture using a light source having a plurality of light source elements emitting different light colors, the emitted colors may not be mixed sufficiently when light is emitted, resulting in color unevenness on the irradiated surface.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a lighting device that is less likely to cause color unevenness on the illuminated surface. [Means for solving the problem]

[0006] In order to solve the above problems, the lighting device of the present invention comprises a light source having a plurality of light source elements, and a reflector having a reflection curve with a focus at a position shifted from the light source center related to the light source, and reflecting light emitted from the light source. Effect of the Invention

[0007] With the above-described configuration, it is possible to provide a lighting fixture that is less likely to produce color unevenness on the illuminated surface even when using a light source having a plurality of light source elements that emit light of different colors. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a lighting fixture 400 according to a first embodiment of the present invention (with the lamp body tilted and the wiring section 12 omitted) as viewed from the lower left. [Diagram 2] 1A is a top view, FIG. 1B is a schematic front view, and FIG. 1C is a bottom view of the lighting device 400 (without wiring portion 12) according to the first embodiment of the present invention. [Diagram 3] 1A is a schematic cross-sectional front view of a lighting fixture 400 according to a first embodiment of the present invention, and FIG. 1B is an enlarged view of a connecting portion between a light body portion 100 and a frame body portion 300 according to the first embodiment of the present invention. [Figure 4] 1 is a cross-sectional side view of a lighting fixture 400 (with wiring portion 12 omitted) according to a first embodiment of the present invention. [Diagram 5] FIG. 2 is a bottom view of a state in which a light source module 11, a wiring portion 12, an insulating member 131, an insulating member fixing screw 132, and a heat sink 14 according to the first embodiment of the present invention are assembled. [Figure 6] 1A is a bottom view of a light source module 11 according to a first embodiment of the present invention, and FIG. 1B is a bottom view of a light source element 111c including a light source center according to the first embodiment of the present invention. [Figure 7]7(a) is a schematic diagram showing a state where the focal point FR of the reflector 21 according to the first embodiment of the present invention is shifted in the positive direction with respect to the Y axis from the light source center LSC. (b) is a schematic diagram showing a state where the focal point FR of the reflector 21 is shifted in the negative direction with respect to the Y axis from the light source center LSC. (c) is an enlarged view of the periphery of the light source center LSC in FIG. 7(b). (d) is an enlarged view of the periphery of the light source center LSC in FIG. 7(b). [Figure 8] FIG. 2 is a diagram showing the relationship between the position of the reflector in the optical axis direction and the angle formed with the optical axis direction of reflected light E2 in the reflector 21 according to the first embodiment of the present invention. [Figure 9] 1A is a diagram showing the light distribution on an irradiated surface when a conventional illuminating device is irradiated onto a flat surface, (b) a diagram showing a simulation result of the same, (c) a diagram showing the light distribution on an irradiated surface when the illuminating device 400 according to the first embodiment of the present invention is irradiated onto a flat surface, and (d) a diagram showing the simulation result of the same. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A lighting fixture 400 according to an embodiment of the present invention will be described below with reference to the drawings. In addition, unless otherwise specified, directions are described such that the side on which the light body 100 is inclined as shown by the white arrow in Fig. 1 and Fig. 4 is the front of the lighting fixture 400.

[0010] <1. First embodiment> A lighting device 400 according to a first embodiment of the present invention will now be described with reference to the drawings. The luminaire 400 is, for example, a luminaire that is installed on a ceiling surface and illuminates a floor surface side. The luminaire 400 includes a light body portion 100 and a frame body portion 300, as shown in FIG.

[0011] <1.1.Light body part 100> The lighting unit 100 includes a light source unit 1 and an optical control unit 2, as shown in FIG.

[0012] <1.1.1.Light source part 1> The light source section 1 is a section that includes a light source element group (light source) 111, and includes a light source module 11, a board mounting screw 115, a wiring section 12, an insulating member 131, an insulating member fixing screw 132, and a heat sink 14, as shown in Figures 3(a) and 5.

[0013] 6(a), the light source module 11 includes a light source element group 111, a substrate 112, substrate mounting holes 112h, and solder parts 112s. The light source element group 111 includes a red light source element 111R, a green light source element 111G, and a blue light source element 111B. In this way, the light source module 11 includes light source elements of three colors and can output various colors by adjusting the light output of each color. In this embodiment, the light source module 11 includes light source elements of three colors, but is not limited thereto, and may include light source elements of multiple colors. For example, the light source module may include two colors, a white light source element and a red light source element, or may include four colors by adding a white light source element to the three color light source elements.

[0014] In the light source element group 111 in this embodiment, red light source elements 111R, green light source elements 111G, and blue light source elements 111B are arranged side by side as shown in FIG. 6(a). Specifically, the light source element at the center of the light source element group 111 is the green light source element 111G, and they are arranged diagonally from the top left to the bottom right. The red light source element 111R is arranged above the central light source element, and the blue light source element 111B is arranged below it, and they are arranged diagonally from the top left to the bottom right in the same manner as the green light source element 111G. When light source elements of the same color are close to each other in this way, the electrical wiring of the light source elements is easy, and power can be supplied collectively, which is convenient when controlling the dimming for each color. In addition, by arranging them diagonally, when light is irradiated, light of the same color is irradiated with a certain degree of dispersion and mixed with other colors, and color unevenness is somewhat suppressed.

[0015] Furthermore, the light source element group 111 has a light source center LSC. The light source center LSC is the optical center of the light source element group 111. In this embodiment, the light source center LSC is one of the green light source elements 111G. In particular, a light source element having a light source center LSC is referred to as a light source element 111c including a light source center. Moreover, each light source element has a square shape as shown in FIGS. 6(a) and (b), and each side has a length of 1.6 mm.

[0016] 5, the light source module 11 is attached to the heat sink 14 by means of board mounting screws 115 through board mounting holes 112h, so that the light source module 11 is mechanically fixed to the heat sink 14 and at the same time thermally connected to the heat sink 14. The heat sink 14 is a member that promotes heat dissipation from the light source element group 111. 5 and 6(a), the substrate 112 is a wiring substrate for mounting the light source element group 111. The solder portion 112s is a portion that electrically connects the substrate 112 and the wiring portion 12. The insulating member 131 is a member that covers and conceals the solder portion 112s to provide electrical insulation and protection, and is attached with insulating member fixing screws 132.

[0017] As shown in FIG. 5, the wiring section 12 is a member for supplying power for lighting the light source element group 111, and includes a wire 121, a connector 122, and a heat-resistant tube 123. The connector 122 is a terminal that is connected to an external power supply device (not shown) to supply power to the light source module 11 . The heat-resistant tube 123 is a member for protecting the wiring 121 from external mechanical and thermal stress.

[0018] <1.1.2. Optical control unit 2> As shown in Fig. 2(b), Fig. 2(c), Fig. 3(a) and Fig. 4, the optical control unit 2 includes a reflector 21, a diffuser 22, a hood 23 and a cylindrical part 24. The reflector 21 is an optical control member for efficiently and effectively irradiating the floor surface direction, and includes a reflection curve 21c for optical control. The reflector 21 is a rotating body whose inner diameter gradually expands. The diffuser 22 is an optical control member for suppressing uneven light on the irradiated surface and reducing glare for the user. The hood 23 is an optical control member for reducing glare for the user, and is attached to the cylindrical part 24 in a manner that sandwiches the diffuser 22 and the reflector 21.

[0019] The cylinder section 24 is a hollow cylindrical section, and is attached to the light source section 1 so as to accommodate the light source module 11, the reflector 21, part of the wiring section 12, the board mounting screw 115, the insulating member 131, and the insulating member fixing screw 132. The lamp section 100 is attached to the frame section 300 so as to be tiltable relative to the frame section 300.

[0020] <1.2.Frame part 300> As shown in FIG. 1, the frame body 300 includes a cone portion 3 and a frame portion 4.

[0021] 1, the cone unit 3 includes a cone 31 and a connecting screw 32. The cone 31 is a member for reducing glare to the user. The cone 31 and the lamp unit 100 are connected by the connecting screw 32 so that the lamp unit 100 can rotate.

[0022] As shown in Fig. 1, the frame portion 4 includes a frame 41, a cone holding spring 42, and a mounting spring 43. The mounting spring 43 is a member for installation on a ceiling surface, and when installing on a ceiling surface, the mounting spring 43 is raised to the state of the mounting spring 43T, as shown in Fig. 3(a). In this state, the ceiling material T can be sandwiched between the mounting spring 43T and the frame 41T and installed on the ceiling surface. In this embodiment, there are three mounting springs 43, and each of them similarly sandwiches the ceiling material T to install the lighting fixture 400.

[0023] A cone holding spring 42 is fixed to the frame 41 with a rivet. The cone 31 is attached to the frame 41 via the cone holding spring 42, and can be rotated horizontally relative to the frame 41 as shown in FIG. 4. The lamp unit 100 is attached to the cone 31 via a connecting screw 32 as shown in FIG. 1, and the lamp unit 100 can be tilted relative to the cone 31 as shown in FIG. 4. The maximum tilt range is 40°, and this state is shown as the lamp unit 100t (two-dot chain line in FIG. 4). In this way, by combining rotation and tilt, the lamp unit 100 can be irradiated in any direction within the range of rotation and tilt.

[0024] <1.3. Suppression of color unevenness> <1.3.1. Reflection curve: shifting the focus> As shown in Fig. 3(a), the reflector 21 is a rotating body whose inner diameter gradually increases around the optical axis passing through the light source center LSC. The central axis of rotation of the reflector 21 coincides with the optical axis at the optical axis center. The reflector 21 also has a reflection curve 21c for controlling light distribution. The reflection curve 21c has an optical focus FR.

[0025] 7(a), (b), (c), and (d) are schematic cross-sectional views showing a state in which the focal point FR of the reflector 21 is shifted in the Y-axis direction from the light source center LSC in the substrate 112 and reflector 21 according to the first embodiment of the present invention. Here, the axes shown by the dashed dotted lines are an X-axis that includes the actual optical axis (the rightward direction in the figure is positive), and an Y-axis that is an arbitrary line parallel to the substrate 112 that includes the light source center LSC (the upward direction in the figure is positive).

[0026] In this embodiment, as shown in Figures 6(b), 7(a) and 7(b), the reflection curve 21c is formed so that the optical focus FR of the reflection curve 21c is located at a position shifted from the light source center LSC. The focus FR shown in Figures 7(a) and (b) is of one cross section, and when the focus FR of each cross section is overlaid, the locus of the focus FR is circular as shown in Figure 6(b), and its radius is shifted by a length of about half the size of the light source element including the light source center LSC (the length of one side of the light source element).

[0027] By using such a reflection curve 21c, the focal point FR of the reflector 21 is shifted from the light source center LSC, the relatively strong light near the light source center is appropriately diffused, and color unevenness on the illuminated surface is suppressed and made less likely to occur. In this embodiment, the focal point FR is a circular locus, but this is not limited thereto, and it is sufficient that the optical focal point FR of the reflection curve 21c is shifted from the light source center LSC. The direction in which the focal point FR is shifted is not limited to the direction shown in Fig. 7(a) and (c). For example, the focal point FR may be shifted in the opposite direction to Fig. 7(a) and (c) as shown in Fig. 7(b) and (d). In this case, the distance by which the focal point FR is shifted from the light source center LSC, that is, the radius of the circle which is the locus of the focal point FR, is arbitrary, but is preferably 1 / 4 to 2 times the length of the size of the light source element, and more preferably 1 / 2 to 1.5 times the length of the size of the light source element.

[0028] <1.3.2. Reflector Curve: Dividing the Area> As shown in Figures 3(a), 4, 7(a) and 7(b), the reflector 21 has a reflection curve 21C. The reflector 21 and the reflection curve 21C are divided into a plurality of cylindrical regions along the direction of the central axis of rotation. In this embodiment, the reflection curve 21C is divided into three cylindrical regions, a reflection curve inner portion 21Ci, a reflection curve central portion 21Cc and a reflection curve outer portion 21Co, and each of these regions is configured to reflect light E2 in a different direction.

[0029] The division of the reflection curve inner part 21Ci, reflection curve central part 21Cc, and reflection curve outer part 21Co is as follows: The reflection curve 21C from the inner end to the outer end is divided into 1000 equal parts along the optical axis to define the "position in the optical axis direction of the reflector." With the inner end at 0 and the outer end at 1000, the positions from 0 to 250 are the reflection curve inner part 21Ci, the positions from 251 to 670 are the reflection curve central part 21Cc, and the positions from 671 to 1000 are the reflection curve outer part 21Co.

[0030] As shown in Fig. 8, the angles of the inner portion 21Ci of the reflection curve, the central portion 21Cc of the reflection curve, and the outer portion 21Co of the reflection curve with respect to the optical axis direction of the reflected light E2 are indicated by LCi, LCc, and LCo, respectively. Note that in Fig. 8, the optical axis direction is the X-axis, and an arbitrary direction perpendicular to the optical axis and including the center of the light source is the Y-axis.

[0031] 7(a), 7(b), and 8, the reflection curve 21c of the reflector 21 is configured so that the angle formed with the optical axis direction of the reflected light E2 in the reflection curve inner portion 21Ci is -3° at position 0, and as the position increases, the angle decreases and becomes 0° near position 250. In the reflection curve central portion 21Cc, the reflection curve 21c of the reflector 21 is configured so that the angle is 0° from near position 250 to near position 670. And, in the reflection curve inner portion 21Ci, the reflection curve 21c of the reflector 21 is configured so that the angle is 0° near position 670, and as the position increases, the angle increases and becomes 3° at position 1000.

[0032] By configuring the reflection curve 21c in this way, the reflection curve central portion 21Cc becomes a reflected light E2 with an angle of 0° with the optical axis direction, i.e., parallel to the optical axis direction, and it is possible to irradiate a concentrated light that does not greatly affect the light distribution characteristics. Then, as the reflected light E2 moves toward the outer circumference of the reflection curve 21C in the reflection curve outer portion 21Co, and as the reflected light E2 moves toward the rotation center axis direction of the reflection curve 21C in the reflection curve inner portion 21Ci, the angle with the optical axis increases continuously and gradually, and the relatively strong light near the center of the light source is diffused appropriately. That is, the angle that the reflected light E2 makes with the optical axis direction differs in each region of the reflector 21, and the effect of diffusing the relatively strong light near the center of the light source appropriately increases as a whole reflection curve 21C, and color unevenness is suppressed and is unlikely to occur.

[0033] The experimental results and the simulation results of the conventional lighting fixture and the lighting fixture 400 according to the present embodiment are shown in Figs. 9(a), (b), (c), and (d). According to Figs. 9(a) and (c), the appearance of the irradiated surface is almost the same, but the color unevenness is suppressed in Fig. 9(c). When comparing specific numerical values, according to Figs. 9(b) and (d), the "1 / 2 beam angle" indicating the light distribution angle is 19° and 18°, which are almost the same. In addition, the numerical values ​​"1020" and "1040" in the lower left diagrams of Figs. 9(b) and (d) indicate the direct illuminance 3 m below when the lighting fixture 400 is installed on the ceiling surface, and are almost the same. From these appearances of the irradiated surface, the light distribution angle, and the direct illuminance, it can be seen that the color unevenness is suppressed without affecting the light distribution characteristics.

[0034] In this embodiment, the reflection curve 21C is divided into three parts, but it is sufficient if the reflection curve 21C as a whole can produce the effect of moderately diffusing the relatively strong light near the center of the light source. For example, the reflection curve may be divided into two parts, an inner part 21Ci of the reflection curve and an outer part 21Co of the reflection curve, or may be divided into four or more parts.

[0035] The distribution of the angle between the reflected light E2 and the optical axis direction is -3° to 0° in the inner portion 21Ci of the reflection curve, 0° in the central portion 21Cc of the reflection curve, and 0° to 3° in the outer portion 21Co of the reflection curve, and although the angle is arbitrary, it is preferably about 0° to 15°, and more preferably about 0° to 5°. Additionally, it is optional to provide an optical control means such as a facet on the reflection curve 21C, and the change in the angle between the reflected light E2 and the optical axis direction relative to the position in the reflector optical axis direction may be continuous or discontinuous, including the boundaries of the division of the reflection curve 21C, and the rate of change is also arbitrary.

[0036] <2. Extraction of invention> The configuration of a lighting fixture according to one embodiment of the present invention, as well as modifications and effects thereof, will be described below.

[0037] (1) A lighting device according to one embodiment of the present invention is a lighting device comprising a light source having a plurality of light source elements, and a reflector having a reflection curve with a focus at a position shifted from the center of the light source related to the light source, and reflecting light emitted from the light source.

[0038] With this configuration, a lighting fixture can be provided in which the reflector has a reflection curve with a focal point at a position shifted from the center of the light source, thereby appropriately diffusing the relatively strong light near the center of the light source of a light source having multiple light source elements, thereby suppressing and making it less likely to cause color unevenness on the illuminated surface.

[0039] (2) Furthermore, the reflector may be a rotating body, the light source may be arranged so that the optical axis of the light source at the light source center coincides with the central axis of rotation of the reflector, and the focal point may be a circular locus.

[0040] According to this configuration, a lighting fixture can be provided in which the reflector, which is a rotating body, has a reflection curve with a focal point at a position shifted from the center of the light source, so that the relatively strong light near the center of the light source of a light source having multiple light source elements is appropriately diffused, thereby suppressing and making it less likely to cause color unevenness on the illuminated surface.

[0041] (3) The lighting device may be configured such that the position of the focal point is shifted from the center of the light source by approximately half the length of the size of the light source element.

[0042] According to this configuration, a lighting fixture can be provided in which the reflector, which is a rotating body, has a reflection curve with a focal point at a position shifted from the center of the light source, thereby appropriately diffusing the relatively strong light near the center of the light source of a light source having multiple light source elements, thereby further suppressing and making it less likely to cause color unevenness on the illuminated surface.

[0043] (4) The reflector may be a rotating body and divided into a plurality of cylindrical regions along the direction of the central axis of the reflector, and the reflection curve of at least one of the plurality of cylindrical regions may reflect light from the light source so as to intersect with the optical axis direction of the light source at a predetermined angle.

[0044] According to this configuration, by dividing the reflector into multiple cylindrical regions and making the angle of reflection in at least one cylindrical region intersect with the optical axis direction at a predetermined angle, the relatively strong light near the center of the light source of a light source having multiple light source elements is diffused appropriately, thereby improving the effect of suppressing color unevenness on the illuminated surface.

[0045] (5) The reflector may be divided into the plurality of cylindrical regions along the direction of the central axis of rotation, and at least one reflective curve of the cylindrical region may reflect light from the light source in a direction away from the optical axis direction of the light source by a predetermined angle.

[0046] According to this configuration, by dividing the reflector into multiple cylindrical regions and setting the angle of reflection in at least one cylindrical region at a predetermined angle away from the optical axis direction, the relatively strong light near the center of the light source having multiple light source elements is diffused appropriately, further enhancing the effect of suppressing color unevenness on the illuminated surface.

[0047] (6) The reflector may be a rotating body and divided into a plurality of cylindrical regions along the direction of the central axis of rotation of the reflector, and at least one reflection curve of the plurality of cylindrical regions may reflect light from the light source in a direction away from the optical axis direction of the light source by a predetermined angle.

[0048] According to this configuration, by dividing the reflector into multiple cylindrical regions and setting the angle of reflection in at least one cylindrical region at a predetermined angle away from the optical axis direction, the relatively strong light near the center of the light source having multiple light source elements is diffused appropriately, further enhancing the effect of suppressing color unevenness on the illuminated surface.

[0049] Thus, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention-specifying matters related to the scope of the claims that are appropriate from the above description. [Explanation of symbols]

[0050] 400 Lighting Equipment 100, 100t light body 1 Light source section 11 Light source module 111 Light source element group, light source 111R Red light source element 111G Green light source element 111B Blue light source element 111c Light source element including a light source center 112 Substrate 112s Soldering section 112h PCB mounting hole 115 Board mounting screw 12 Wiring section 121 Wiring 122 Connector 123 Heat-resistant tube 131 Insulating materials 132 Insulation material fixing screw 14 Heat sink 2 Optical control section 21 Reflector 21C Reflection Curve 21Ci Reflective curve inner part 21Cc Reflective curve center 21Co Reflective curve outer part 22 Diffuser 23 Food 24 Cylinder part 300 Frame body part 3 Cone section 31 Corn 32 Connecting screw 4 Frame 41, 41T frame 42 Cone retaining spring 43, 43T Mounting spring E1 incident light E2 reflected light LSC light source center FR focus LC: Line showing the angle between the reflected light and the optical axis direction LCi: A line showing the angle between the inner part of the reflection curve and the optical axis direction LCc: A line showing the angle between the center of the reflection curve and the optical axis direction LCo: A line showing the angle between the outer part of the reflection curve and the optical axis direction

Claims

1. A light source including a plurality of light source elements; a reflector having a reflection curve with a focal point at a position shifted from the center of the light source and reflecting light emitted from the light source; Lighting fixtures.

2. The reflector is a rotating body, the light source is arranged such that an optical axis of the light source at the light source center coincides with a rotation central axis of the reflector, The focus is a circular locus 2. A lighting device according to claim 1.

3. The position of the focal point is shifted from the center of the light source by about half the length of the size of the light source element.

3. A lighting device according to claim 2.

4. The reflector is a rotating body, The reflector is divided into a plurality of cylindrical regions along a rotation axis direction, At least one reflection curve of the plurality of cylindrical regions reflects the light from the light source so as to intersect with the optical axis direction of the light source at a predetermined angle.

2. A lighting device according to claim 1.

5. The reflector is divided into the plurality of cylindrical regions along the rotation central axis direction, At least one reflection curve of the cylindrical region reflects light from the light source in a direction away from the optical axis direction of the light source at a predetermined angle.

5. A lighting device according to claim 4.

6. The reflector is a rotating body, The reflector is divided into a plurality of cylindrical regions along a rotation axis direction, At least one reflection curve of the plurality of cylindrical regions reflects light from the light source in a direction away from the optical axis direction of the light source by a predetermined angle.

2. A lighting device according to claim 1.

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