lighting fixtures

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 using multiple lenses, Patent Document 2 discloses a lighting fixture that suppresses unevenness in illuminance 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] Japanese Patent Application Laid-Open No. 2013-182717 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-186978 [Patent Document 3] Japanese Patent Application Publication No. 2018-069768 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 that emit light of different colors, the emitted colors may not be mixed sufficiently when light is emitted, resulting in color unevenness on the illuminated surface.

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

[0006] In order to solve the above problem, 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. [Effects 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 that includes a plurality of light source elements that emit light of different colors. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a lighting fixture 400 (with the lamp body tilted and the wiring section 12 omitted) according to a first embodiment of the present invention, as viewed from the lower left. [Figure 2] 1A is a top view of a lighting fixture 400 according to a first embodiment of the present invention, FIG. 1B is a schematic front view of the same, and FIG. 1C is a bottom view of the lighting fixture 400 according to the first embodiment of the present invention (without wiring section 12). [Figure 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 lamp body 100 and a frame body 300 according to the first embodiment of the present invention. [Figure 4] 1 is a C-sectional side view of a lighting fixture 400 (with wiring section 12 omitted) according to a first embodiment of the present invention. [Figure 5] 1 is a bottom view of an assembled state of 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. [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 a first embodiment of the present invention. [Figure 7]7(a) is a schematic diagram showing a state in which the focal point FR of the reflector 21 according to the first embodiment of the present invention is shifted in the positive direction of the Y axis from the light source center LSC. (b) is a schematic diagram showing a state in which the focal point FR of the reflector 21 is shifted in the negative direction of 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] 10 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. FIG. [Figure 9] (a) A diagram showing the light distribution on the irradiated surface when a conventional lighting device is irradiated onto a flat surface. (b) A diagram showing the simulation results of the same. (c) A diagram showing the light distribution on the irradiated surface when a lighting device 400 according to the first embodiment of the present invention is irradiated onto a flat surface. (d) A diagram showing the simulation results of the same. DETAILED DESCRIPTION OF THE INVENTION

[0009] A lighting fixture 400 according to an embodiment of the present invention will be described below with reference to the drawings. Unless otherwise specified, directions are defined such that the side on which the lamp body 100 is inclined, as indicated by the white arrows in Figures 1 and 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 lighting fixture 400 is, for example, a lighting fixture that is installed on a ceiling surface and illuminates the floor surface side. As shown in FIG.

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

[0012] <1.1.1.Light source section 1> The light source section 1 is a section that includes a group of light source elements (light source) 111, and as shown in Figures 3(a) and 5, 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.

[0013] 6(a), the light source module 11 includes a light source element group 111, a substrate 112, substrate mounting holes 112h, and solder portions 112s. The light source element group 111 includes red light source elements 111R, green light source elements 111G, and blue light source elements 111B. In this way, the light source module 11 includes light source elements of three colors and can output a variety of 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 to this and may include light source elements of multiple colors. For example, the light source module 11 may include two colors, a white light source element and a red light source element, or four colors, including three color light source elements and a white light source element.

[0014] In this embodiment, the light source element group 111 includes red light source elements 111R, green light source elements 111G, and blue light source elements 111B, which are arranged side by side as shown in FIG. 6( a). Specifically, the central light source element of the light source element group 111 is the green light source element 111G, and these elements are arranged diagonally from the upper left to the lower right. The red light source elements 111R are arranged above the central light source element, and the blue light source elements 111B are arranged below it. These elements, similar to the green light source element 111G, are also arranged diagonally from the upper left to the lower right. Having light source elements of the same color close to each other in this manner facilitates electrical wiring of the light source elements, allowing for collective power supply, which is convenient for dimming control for each color. Furthermore, by arranging the light elements diagonally, when light is emitted, the light of the same color is dispersed to some extent and mixed with other colors, thereby slightly reducing color unevenness.

[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, the light source element having the light source center LSC is referred to as the light source element 111c including the light source center. Furthermore, each light source element has a square shape as shown in FIGS. 6(a) and 6(b), with each side having a length of 1.6 mm.

[0016] 5, the light source module 11 is attached to the heat sink 14 with board mounting screws 115 through board mounting holes 112h, thereby being mechanically fixed to the heat sink 14 and thermally connected to it. 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 connects 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 Figures 2(b), 2(c), 3(a), and 4, the optical control unit 2 includes a reflector 21, a diffuser 22, a hood 23, and a cylindrical body 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 with a gradually expanding inner diameter. The diffuser 22 is an optical control member for suppressing uneven light on the irradiated surface and reducing glare to the user. The hood 23 is an optical control member for reducing glare to the user, and is attached to the cylindrical body 24 so as to sandwich the diffuser 22 and reflector 21.

[0019] The cylindrical body 24 is a hollow cylindrical portion, and is attached to the light source unit 1 so as to accommodate the light source module 11, the reflector 21, part of the wiring unit 12, the board mounting screws 115, the insulating member 131, and the insulating member fixing screws 132. The lamp body 100 is attached to the frame body 300 so as to be tiltable relative to the frame body 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 body unit 100 are connected by the connecting screw 32 so that the lamp body unit 100 can rotate.

[0022] As shown in Fig. 1, the frame portion 4 includes a frame 41, a cone holding spring 42, and an attachment spring 43. The attachment spring 43 is a component for installation on a ceiling surface, and when installing on a ceiling surface, the attachment spring 43 is raised to the attachment spring 43T state as shown in Fig. 3(a). By setting it in this state, the ceiling material T can be sandwiched between the attachment spring 43T and the frame 41T and installed on the ceiling surface. In this embodiment, there are three attachment springs 43, and each 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 body 100 is attached to the cone 31 via a connecting screw 32 as shown in FIG. 1, and the lamp body 100 can be tilted relative to the cone 31 as shown in FIG. 4. The tilt angle is up to 40°, and this angle is shown as the lamp body 100t (two-dot chain line in FIG. 4). By combining rotation and tilt movement in this way, the lamp body 100 can irradiate in any direction within the range of rotation and tilt movement.

[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 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 such that the X-axis is an axis including the actual optical axis (the rightward direction in the drawing is positive), and the Y-axis is an arbitrary line parallel to the substrate 112 including the light source center LSC (the upward direction in the drawing 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 superimposed, the locus of the focus FR is circular as shown in Figure 6(b), and its radius is shifted by a length approximately 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 diffused appropriately, and color unevenness on the illuminated surface is suppressed and made less likely to occur. In this embodiment, the focal point FR has a circular locus, but this is not limiting, and it is sufficient that the optical focal point FR of the reflection curve 21c is shifted from the light source center LSC. Furthermore, the direction in which the focal point FR is shifted is not limited to the direction shown in FIGS. 7(a) and 7(c). For example, the focal point FR may be shifted in the opposite direction to that shown in FIGS. 7(a) and 7(c), as shown in FIGS. 7(b) and 7(d). In this case, the distance by which the focal point FR is shifted from the light source center LSC, i.e., the radius of the circle that is the locus of the focal point FR, is arbitrary, but is preferably between one-quarter and two times the size of the light source element, and more preferably between one-half and one-and-a-half times 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, each of which is configured to reflect light E2 in a different direction.

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

[0030] 8, the angles formed by 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. 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 reflected light E2 in the reflection curve inner portion 21Ci is -3° at position 0, decreases as the position increases, and reaches 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. 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, increases as the position increases, and reaches 3° at position 1000.

[0032] By configuring the reflective curve 21c in this manner, the angle formed by the reflective curve central portion 21Cc with the optical axis direction is 0°, i.e., the reflected light E2 is parallel to the optical axis direction, enabling the emission of concentrated light that does not significantly affect the light distribution characteristics. Furthermore, as the reflected light E2 moves toward the outer periphery of the reflective curve 21C in the reflective curve outer portion 21Co, and as the reflected light E2 moves toward the rotational axis direction of the reflective curve 21C in the reflective curve inner portion 21Ci, the angle formed by the reflective light E2 with the optical axis continuously and gradually increases, thereby appropriately diffusing the relatively strong light near the light source center. In other words, the angle formed by the reflected light E2 with the optical axis varies in each region of the reflector 21, and the reflective curve 21C as a whole is more effectively diffused, thereby suppressing and reducing color unevenness.

[0033] Experimental and simulation results for a conventional lighting fixture and the lighting fixture 400 according to the present embodiment are shown in Figures 9(a), 9(b), 9(c), and 9(d). The illumination surface appearances in Figures 9(a) and 9(c) are nearly identical, but color unevenness is more suppressed in Figure 9(c). Comparing specific numerical values, the "half beam angle" indicating the light distribution angle is 19° and 18° in Figures 9(b) and 9(d), which are nearly identical. Furthermore, the numerical values ​​"1020" and "1040" in the lower left diagrams of Figures 9(b) and 9(d) indicate the direct illuminance 3 m below the lighting fixture 400 when it is installed on a ceiling surface, which are nearly identical. From these illumination surface appearances, light distribution angle, and direct illuminance, it can be seen that color unevenness is suppressed without significantly 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, and for example, it may be divided into two parts, an inner reflection curve part 21Ci and an outer reflection curve part 21Co, or it may be divided into four or more parts.

[0035] Furthermore, 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°. Furthermore, 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 with respect to the position in the reflector optical axis direction may be continuous or discontinuous, including at the boundaries where the reflection curve 21C is divided, and the rate of change is also optional.

[0036] <2. Extraction of inventions> The configuration of a lighting fixture as one embodiment of the present invention, as well as modifications and effects thereof, will be further 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 light source center 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 shifted from the center of the light source, which moderately diffuses 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 that color unevenness will occur on the illuminated surface.

[0039] (2) Furthermore, the reflector may be a rotating body, and the light source may be arranged so that the optical axis of the light source at the light source center coincides with the rotational center axis of the reflector, and the focus 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, 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 that color unevenness will occur on the illuminated surface.

[0041] (3) The lighting fixture 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 improving the effect of suppressing and making it less likely that color unevenness will occur 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 rotation of the reflector, and at least one reflection curve 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 enhancing 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 reflection 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 of a 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 of a light source having multiple light source elements is diffused appropriately, further enhancing the effect of suppressing color unevenness on the illuminated surface.

[0049] As such, 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 according to the scope of the claims that are appropriate from the above description. [Explanation of symbols]

[0050] 400 lighting fixtures 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 PCB 112s soldering part 112h PCB mounting hole 115 PCB mounting screw 12 Wiring section 121 Wiring 122 Connector 123 Heat-resistant tube 131 Insulating materials 132 Insulation member 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: A line indicating the angle between the reflected light and the optical axis LCi: A line indicating the angle between the optical axis direction and the reflected light from the inner part of the reflection curve LCc: A line indicating the angle between the center of the reflection curve and the optical axis direction LCo: A line indicating the angle between the outer part of the reflection curve and the optical axis direction

Claims

1. A light source having a plurality of light source elements of at least two colors; 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; All focal points on the reflector are shifted from the optical axis passing through the center of 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. The lighting fixture of 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. The lighting fixture according to claim 2.

4. the reflector is a rotating body, The reflector is divided into a plurality of cylindrical regions along the rotational 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. The lighting fixture of 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 by a predetermined angle.

5. The lighting fixture according to claim 4.

6. the reflector is a rotating body, The reflector is divided into a plurality of cylindrical regions along the rotational 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. The lighting fixture of claim 1.

Images