Lighting device

Abstract

To provide a lighting device capable of improving a light distribution uniformity ratio on a surface to be irradiated.SOLUTION: A lighting device comprises: a light source 30 that emits light; a cone 20 into which the light emitted by the light source 30 is incident through a first upper opening 21 having an inner peripheral edge 211, and emits the light having been incident through the first upper opening 21 from a first lower opening 23; and a packing 60 that covers the inner peripheral edge 211 of the cone 20, and diffuses and reflects the incident light toward the inner peripheral edge 211 of the cone 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lighting device having an auxiliary reflecting member. [Background technology]

[0002] Patent Document 1 discloses a lighting device in which light emitted from a light source passes through a transparent member such as glass and then enters an auxiliary reflecting member made of aluminum or other material, and a configuration in which a packing is placed at the end of the transparent member. As a result, the lighting device of Patent Document 1 prevents damage to the transparent member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-170202 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the lighting device of Patent Document 1 has a problem in that it does not take into consideration uneven light, which is a state in which the luminance on the surface to be illuminated is partially uneven.

[0005] In view of the above problems, an object of the present invention is to provide an illumination device that can improve the uniformity of light distribution on an illumination target 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 that emits light, an auxiliary reflective member that receives the light emitted from the light source through a first upper opening having an inner peripheral edge and causes the light that has entered through the first upper opening to exit through a first lower opening, and a covering member that covers the inner peripheral edge of the auxiliary reflective member and diffuses and reflects the light that has entered toward the inner peripheral edge of the auxiliary reflective member. [Effects of the Invention]

[0007] With the above-described configuration, the lighting device according to the present invention can improve the uniformity of light distribution on the surface to be illuminated. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a lighting system 1000 according to an embodiment of the present invention. [Figure 2] 1A and 1B are diagrams illustrating the external appearance of a lighting device 1. [Figure 3] FIG. 3 is a cross-sectional view taken along line XX in FIG. 2. [Figure 4] FIG. 3 is a view of the light source 30 as seen from below in the axial direction. [Figure 5] FIG. 4 is an enlarged view of the packing 60 in FIG. 3. [Figure 6] 4A and 4B are diagrams for explaining how the frame body 80 is attached to the ceiling 350. [Figure 7] 10 is a schematic diagram for explaining reflection at an inner peripheral edge 211 of an illumination device 3 in which a packing 60 is omitted (comparative example). FIG. [Figure 8] 10 is a diagram for explaining the intensity distribution of light when light emitted by the lighting device 3 hits a wall surface (comparison example). FIG. [Figure 9] 5 is a schematic diagram for explaining reflection at an inner circumferential edge 211 of the lighting device 1 according to the embodiment. FIG. [Figure 10] 3 is a diagram for explaining the intensity distribution of light when the light emitted by the lighting device 1 of the first embodiment hits a wall surface. FIG. [Figure 11] 10 is a diagram for explaining the intensity distribution of light when light emitted by the lighting device 1a of the second embodiment strikes a wall surface. FIG. [Figure 12] 10 is a diagram for explaining the intensity distribution of light when light emitted by the lighting device 1b of the third embodiment strikes a wall surface. FIG. [Figure 13] 10 is a diagram for explaining the intensity distribution of light when light emitted by the lighting device 1c of the fourth embodiment strikes a wall surface. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] <1. Embodiment> <1-1. Configuration of lighting system and lighting device> Hereinafter, a lighting system according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, identical parts included in common in the referenced drawings will be assigned the same reference numerals, and duplicated descriptions of the identical parts will be omitted as a general rule.

[0010] FIG. 1 is a diagram illustrating a lighting system 1000 according to an embodiment of the present invention.

[0011] The lighting system 1000 is a system that illuminates the vicinity of a location where a lighting device 1 is installed. The lighting system 1000 includes the lighting device 1, a power source 100, and a tablet 300 that is an example of a portable information terminal device.

[0012] In the following description, when the lighting device 1 is attached to a ceiling, the direction along the central axis L of the lighting device 1 from the ceiling to the floor will be referred to as "downward," and the direction from the floor to the ceiling will be referred to as "upward." Furthermore, the direction along the central axis L will be referred to as the "axial direction" or "up-down direction," the direction along the circumference of a circle centered on the central axis L will be referred to as the "circumferential direction," and the direction perpendicular to the central axis L will be referred to as the "radial direction."

[0013] In this embodiment, the central axis L coincides with the optical axis of the light source provided in the lighting device 1.

[0014] The lighting device 1 is, for example, a downlight, and is used in a state where it is embedded and fixed in an embedding hole 351 provided in a ceiling 350. The lighting device 1 emits light in a specific direction. For example, the lighting device 1 emits light downward from the ceiling 350.

[0015] The power supply 100 independently drives each of the light-emitting elements that emit light of three colors provided in the lighting device 1. The power supply 100 supplies the lighting device 1 with power for independently driving the light-emitting elements of the three colors provided in the lighting device 1 via a power supply cable 101.

[0016] The power supply 100 receives a control instruction transmitted from the tablet 300. The control instruction indicates, for example, the amount of light to be emitted from each of the three color light-emitting elements. The power supply 100 supplies power to the lighting device 1 in accordance with the received control instruction.

[0017] The tablet 300 is a portable information terminal device with a rectangular plate-like appearance and a touch panel 301 embedded on one surface. The tablet 300 is also an example of a device that functions as a lighting control device. The tablet 300 displays a user interface (hereinafter referred to as "UI") on the touch panel 301 and receives control instructions from a user. The tablet 300 receives the control instructions from the user and transmits the contents of the received control instructions to the power source 100 via wireless communication. In FIG. 1, dotted arrows schematically represent wireless communication.

[0018] Fig. 2 is a diagram showing the appearance of the lighting device 1. Fig. 3 is a cross-sectional view taken along line XX in Fig. 2. Fig. 4 is a diagram showing the light source 30 as viewed from below in the axial direction. Fig. 5 is an enlarged view of the packing 60 in Fig. 3.

[0019] The lighting device 1 includes a lighting body 2 and a frame body 80.

[0020] The lighting body 2 is the portion of the lighting device 1 other than the frame body 80. The lighting body 2 emits light. The lighting body 2 includes a cone 20 that functions as an auxiliary reflecting member.

[0021] The frame 80 is a frame for fixing the lighting body 2 to the ceiling 350. The frame 80 is detachably attached to the lighting body 2 and supports the lighting body 2. The frame 80 is separable from the cone 20 provided on the lighting body 2. In other words, the frame 80 is detachably attached to the cone 20 and supports the cone 20. The frame 80 is provided with a plurality of mounting springs 81. The plurality of mounting springs 81 fix the frame 80 to embedding holes 351 provided in the ceiling 350.

[0022] In addition to the cone 20, the lamp body 2 includes a housing 10, a light source 30, a reflector 40 that functions as a reflecting member, a light diffusion plate 50 that functions as a light-transmitting member that transmits incident light, a packing 60 that functions as a covering member, and a heat sink 70. The components included in the lighting device 1 are arranged around a central axis L.

[0023] The cone 20, the reflector 40, the light diffusion plate 50, and the packing 60 control the light emitted by the light source 30 to a desired light distribution.

[0024] The housing 10 is a cylindrical member centered on a central axis L, and houses the light source 30 and the like. The housing 10 is made of a material such as metal. A heat sink 70 is fixed to the housing 10.

[0025] The heat sink 70 dissipates heat generated by the light source 30. The heat sink 70 is a cylindrical member centered on a central axis L, and has a plurality of heat dissipation fins extending in the vertical and radial directions. The heat sink 70 is fixed to the upper part of the housing 10 by heat sink fixing screws 11.

[0026] The heat sink 70 has a flat surface 73 at its bottom. The flat surface 73 is the surface on which the light source 30 is attached.

[0027] One end of a power supply cable 101 is electrically connected to the light source 30. The other end of the power supply cable 101 is electrically connected to a power source 100.

[0028] The light source 30 receives power from the power source 100 via a power supply cable 101. The light source 30 emits light of three colors using the supplied power. The optical axis of the light emitted by the light source 30 coincides with the central axis L. The light-emitting surface of the light source 30 faces downward in the axial direction, and the light source 30 emits light downward in the axial direction. The surface of the light source 30 opposite to the light-emitting surface is fixed to the flat portion 73 of the heat sink 70. Optical paths L11 and L12 are examples of optical paths of the light emitted by the light source 30.

[0029] 3, light emitted by the light source 30 passes through the space inside the reflector 40, the light diffuser 50, and the space inside the cone 20, and is irradiated to the outside of the lighting device 1. At that time, the light along the light path L12 is reflected by the packing 60.

[0030] As shown in FIG. 4, the light source 30 includes a substrate 31 and an LED group 32 in which a plurality of SMD (Surface Mount Device) type LEDs (Light Emitting Diodes) that are light emitting elements are arranged.

[0031] On the lower surface of the substrate 31 (the surface on the near side in FIG. 4), an insulating layer and a wiring pattern are arranged on the surface of a metal plate such as aluminum. LEDs 33a to 33c, which are included in the LED group 32 and emit at least three types of light, are arranged on the wiring pattern. The LEDs 33a to 33c each emit light of a different color. Each of the LEDs 33a to 33c has at least one LED.

[0032] The LEDs 33a to 33c are electrically connected to the wiring pattern by solder. The LEDs 33a to 33c emit light downward from the substrate 31, forming a light-emitting surface on the lower side of the substrate 31.

[0033] The LEDs 33a to 33c included in the LED group 32 are arranged, for example, in a substantially octagonal shape on a plane perpendicular to the central axis L, centered on the central axis L. The LEDs 33a to 33c included in the LED group 32 may be arranged in a polygonal shape such as a substantially circular shape or a substantially quadrangular shape instead of the substantially octagonal shape.

[0034] The area where the LEDs 33a to 33c included in the LED group 32 are arranged is, for example, a substantially circular shape with a diameter of 6 mm to 33 mm. Note that the area where the LEDs 33a to 33c included in the LED group 32 are arranged may not be a substantially circular shape, but may be a polygonal shape such as a substantially octagonal or substantially quadrangular shape.

[0035] The heat generated by the LED group 32 is transferred from the LED group 32 to the substrate 31 .

[0036] The substrate 31 is fixed to the flat surface 73 of the heat sink 70 by screws or the like (not shown) inserted into the screw holes 34. In addition, the surface of the substrate 31 opposite to the light-emitting surface is thermally connected to the flat surface 73 of the heat sink 70 via a heat conductive member 74 such as a heat conductive sheet. As a result, the heat generated by the LED group 32 is transferred to the heat sink 70 via the substrate 31 and the heat conductive member 74, and is dissipated from the heat sink 70.

[0037] 3, reflector 40 emits light incident from second upper opening 44, which is an opening on the upper side, through second lower opening 45, which is an opening on the lower side. Light emitted from light source 30 is incident on second upper opening 44. Light incident from light source 30 and passing through the space inside reflector 40, and light incident from light source 30 and reflected by second inner peripheral surface 43, which is the inner peripheral surface of reflector 40, are emitted from second lower opening 45.

[0038] The reflector 40 is made of a material such as metal. The second inner peripheral surface 43 of the reflector 40 has a diameter that increases from the second upper opening 44 toward the second lower opening 45. The second inner peripheral surface 43 of the reflector 40 is made of a material that has a high light reflectance. The second inner peripheral surface 43 may be textured (embossed) or otherwise processed. The axis that forms the center of the reflector 40 coincides with the central axis L.

[0039] The reflector 40 is fixed to the bottom of the heat sink 70 by feet 41 and reflector fixing screws 42. The reflector 40 is fixed below the light source 30 at a position at least a predetermined insulation distance away from the light source 30. The predetermined insulation distance between the reflector 40 and the light source 30 is, for example, 2 mm to 3 mm.

[0040] The light diffusion plate 50 transmits incident light and emits it. Furthermore, the light incident on the light diffusion plate 50 is diffused inside the light diffusion plate 50, and the diffused light is emitted. Light emitted from the reflector 40 is incident on the light diffusion plate 50. The material of the light diffusion plate 50 is, for example, acrylic. The color of the light diffusion plate 50 is, for example, milky white.

[0041] The cone 20 allows light incident from the light diffusion plate 50 into the first upper opening 21, which is the upper opening, to pass through the internal space or to be reflected by the first inner surface 22, which is the inner surface of the cone 20, and then emits the light from the first lower opening 23, which is the lower opening.

[0042] The material of the cone 20 is, for example, metal. The cone 20 is connected to the lower part of the housing 10 via a joint 12. The housing 10 and the cone 20 are made of the same material and are joined and fixed to each other at the joint 12, thereby becoming one body.

[0043] The first upper opening 21 of the cone 20 has an inner peripheral edge 211. The inner peripheral edge 211 is an edge of the first inner peripheral surface 22 of the cone 20 that is closer to the central axis L of the first upper opening 21. The shape of the inner peripheral edge 211 is rounded, that is, has a so-called R-shape.

[0044] The first inner circumferential surface 22 of the cone 20 expands in diameter from the first upper opening 21 toward the first lower opening 23. The cone 20 sandwiches the light diffusion plate 50 together with the reflector 40.

[0045] 5, the packing 60 is a ring-shaped member, and is sandwiched between the light diffusion plate 50 and the cone 20. The material of the packing is, for example, silicone rubber.

[0046] The packing 60 includes an inner edge portion 63, a connecting portion 62, and an outer edge portion 61. The inner edge portion 63 covers the inner peripheral edge 211 and diffuses and reflects light incident toward the inner peripheral edge 211. The outer edge portion 61 contacts the outer edge of the light diffuser plate 50 and restricts radial movement of the light diffuser plate 50. The connecting portion 62 connects the inner edge portion 63 and the outer edge portion 61.

[0047] The thickness D1 of the outer edge portion 61 is, for example, 2 mm to 3 mm. The thickness D2 of the connection portion 62 is, for example, 2 mm to 3 mm. The thickness D3 of the inner edge portion 63 is, for example, 2 mm to 3 mm.

[0048] <1-2. Mounting the lighting device 1 on the ceiling 350> 1 and 6, the installation of the lighting device 1 on the ceiling 350 will be described. FIG. 6 is a diagram for explaining the installation of the frame body 80 on the ceiling 350.

[0049] When attaching and fixing the lighting device 1 to the ceiling 350, first, as shown in Figure 6, bend the mounting spring 81 in the direction of arrows 361 and 362 so that the claw portion 82 at the tip of the mounting spring 81 is positioned above the frame body 83.

[0050] Next, with the mounting spring 81 bent, hold the frame body 83 and insert the mounting spring 81 and frame body 83 into the embedding hole 351 from the underside of the embedding hole 351. When the bent mounting spring 81 is inserted into the embedding hole 351, the mounting spring 81 tries to return to the state shown in FIG. 6 due to its own elastic force. This elastic force causes the frame body 83 and the mounting spring 81 to sandwich the ceiling 350. As a result, the frame body 80 is fixed to the embedding hole 351 in the ceiling 350.

[0051] Next, the lighting body 2 is inserted from below into the hole 84 of the frame body 80 fixed to the recessed hole 351. When the lighting body 2 is inserted into the hole 84, a spring (not shown) provided in the frame body 83 fixes the cone 20 provided on the lighting body 2 to the frame body 83. In this way, the lighting device 1 is fixed to the ceiling 350.

[0052] <2. Brightness of the inner periphery 211 and distribution of light irradiated onto a wall surface, etc.> The brightness of the inner peripheral edge 211 and the distribution of light irradiated onto a wall surface or the like will be described below with reference to Table 1 and Figures 7 to 13. Table 1 is a list of characteristics in examples and comparative examples of this embodiment.

[0053] [Table 1]

[0054] The columns of Table 1, from the left, respectively show the characteristics of Example 1, Example 2, Example 3, Example 4, and Comparative Example. Furthermore, the rows of Table 1, from the top, respectively show the type of packing, the color of the packing, the reflectance of the packing, the clarity of the light edges 601 and 611 on the illuminated surface, the luminance of the inner peripheral edge 211 when a person looks up at the lighting fixture from below, and the efficiency of the lighting device.

[0055] The reflectance of the packing is the reflectance of the surface of the inner edge portion 63 that is closer to the central axis L in the radial direction. The efficiency of the lighting device is the ratio of light emitted from the cone 20 to the light emitted by the light source 30.

[0056] <2.1.1 Comparative Example> First, the reflection at the inner circumferential edge 211 and the distribution of light irradiated onto a wall surface or the like in the comparative example will be described with reference to Table 1, FIGS.

[0057] Fig. 7 is a schematic diagram (comparative example) showing reflection at the inner peripheral edge 211 of the lighting device 3 in which the packing 60 is omitted from the lighting device 1. Fig. 8 is a diagram (comparative example) showing the light intensity distribution when the light emitted by the lighting device 3 hits a wall surface.

[0058] 7, in the lighting device 3 of Comparative Example 1, the inner circumferential edge 211 is not covered with the packing 60. Therefore, light along the optical path L21 toward the inner circumferential edge 211 is reflected without being diffused. As a result, a person who looks up at the lighting device 3 feels a strong reflection from the inner circumferential edge 211. This leads to discomfort for the person who looks up at the lighting device 3.

[0059] 8, strong and clear light edges 601 and 611 appear in the intensity distribution of light emitted by the lighting device 3 onto a wall surface or the like. The brightness of an area 603 between the light edges 601 and 611 is clearly different from the brightness of an area 613 inside the light edge 611. Such strong and clear light edges 601 and 611 reduce the uniformity of light distribution, which may be undesirable in some cases.

[0060] The efficiency in the comparative example is 70.5%.

[0061] <2.1.2 This embodiment> Next, reflection at the inner circumferential edge 211 in this embodiment will be described with reference to FIG.

[0062] FIG. 9 is a schematic diagram for explaining reflection at the inner circumferential edge 211 of the lighting device 1 of this embodiment.

[0063] 9, in the lighting device 1 of this embodiment, the inner circumferential edge 211 is covered with a packing 60. Therefore, light along optical path L22 heading toward the inner circumferential edge 211 is diffusely reflected by the surface of the packing 60 and split into light along optical paths L23a, L23b, and L23c, for example. As a result, a person looking up at the lighting device 1 is less likely to perceive strong reflection from the inner circumferential edge 211.

[0064] <2.1.2.1 Example 1> The intensity distribution of light irradiated onto the wall surface in Example 1 of this embodiment will be described using Table 1 and Fig. 10. Example 1 is an example in which the packing of the lighting device 1 is packing 60, and the color of the surface of the packing 60 is white. In addition, the reflectance of the surface of the packing 60 is 89%.

[0065] 10, the intensity distribution of light irradiated onto the wall surface in Example 1 shows weak and vague light edges 601 and 611. Because the light edges 601 and 611 are weak and vague, it is difficult for the human eye to distinguish the difference in brightness between the region 603 between the light edges 601 and 611 and the region 613 inside the light edge 611.

[0066] As shown in Table 1, the efficiency in Example 1 is 68.0%.

[0067] <2.1.2.2 Example 2> The intensity distribution of light irradiated onto a wall surface in Example 2 of this embodiment will be described using Table 1 and FIG. 11. Example 2 is an example of an illumination device 1a in which the packing 60 of the illumination device 1 is replaced with a packing 60a. In the illumination device 1a in Example 2, the surface of the packing 60a is milky white. The reflectance of the surface of the packing 60a is 23%.

[0068] 11, in the intensity distribution of light irradiated onto the wall surface in Example 2, slightly weak and vague light edges 601 and 611 appear. The light edges 601 and 611 in Example 2 are slightly clearer than the light edges 601 and 601 in Example 1. However, similar to Example 1, it is difficult for the human eye to distinguish the difference in brightness between the region 603 between the light edges 601 and 611 and the region 613 inside the light edge 611.

[0069] As shown in Table 1, the efficiency in Example 2 is 67.1%.

[0070] 2.1.2.3 Example 3 The intensity distribution of light irradiated onto a wall surface in Example 3 of this embodiment will be described using Table 1 and FIG. 12. Example 3 is an example of lighting device 1b in which the packing 60 of lighting device 1 is replaced with packing 60b. In lighting device 1b in Example 3, the surface of packing 60b is black. The reflectance of the surface of packing 60b is 4%.

[0071] 12, in the intensity distribution of light irradiated onto the wall surface in Example 3, the weakest and fainter light edges 601 and 611 appear compared to Examples 1 and 2. The light edges 601 and 611 in Example 3 are weaker and fainter than the light edges 601 and 601 in Examples 1 and 2. Furthermore, when viewed with the human eye, the difference in brightness between the region 603 between the light edges 601 and 611 and the region 613 inside the light edge 611 is less noticeable than in Examples 1 and 2.

[0072] As shown in Table 1, the efficiency in Example 3 is 57.2%.

[0073] 2.1.2.4 Example 4 The intensity distribution of light irradiated onto the wall surface in Example 4 will be described using Table 1 and FIG. 13. Example 4 is an example of a lighting device 1c in which the packing 60 of the lighting device 1 is replaced with a packing 60c. In the lighting device 1c in Example 4, the color of the packing 60c is transparent. The reflectance of the surface of the packing 60c is 8%.

[0074] 13, clear light edges 601 and 611 appear in the intensity distribution of light irradiated onto the wall surface in Example 4. Furthermore, when viewed with the human eye, the brightness of an area 603 between the light edges 601 and 611 is clearly different from the brightness of an area 613 inside the light edge 611. Such strong and clear light edges 601 and 611 reduce the uniformity of light distribution, which may be undesirable in some cases.

[0075] As shown in Table 1, the efficiency in Example 4 is 67.7%.

[0076] <2.1.3 Summary> (1) The brightness of the inner periphery 211 and the distribution of light irradiated onto the wall surface, etc. Referring again to Table 1, the brightness of the inner periphery 211 of the lighting device in Examples 1 to 4 and the comparative example, and the distribution of light irradiated onto a wall surface or the like will be described.

[0077] First, as shown in Table 1, the brightness of the inner peripheral edge 211 in Examples 1 to 3 is similar to that of the surrounding area of ​​the inner peripheral edge 211. On the other hand, the brightness of the inner peripheral edge 211 in Example 4 and the Comparative Example is higher than that of the surrounding area of ​​the inner peripheral edge 211. If the brightness of the inner peripheral edge 211 is higher than that of the surrounding area, people who look up at the lighting fixture may feel dazzled. For this reason, the brightness of the inner peripheral edge 211 in Examples 1 to 3 is preferable to that in Example 4 and the Comparative Example.

[0078] Next, as shown in Table 1, the light edges 601, 611 in Example 4 and the comparative example are clear. On the other hand, the light edges 601, 611 in Examples 1 to 3 are vague. It is preferable that the light distribution uniformity on the irradiation target surface is high. For this reason, it is preferable that the strength of the light edges 601, 611 is weak and vague. With regard to the strength of the light edges 601, 611 in Examples 1 to 3, Example 3 is the weakest, Example 1 is the next weakest, and Example 2 is the strongest. For this reason, with regard to the strength of the light edges 601, 611, Example 3 is the most preferable, Example 1 is the second most preferable, and Example 2 is the third most preferable.

[0079] Therefore, in terms of the brightness of the inner circumferential edge 211 and the distribution of light irradiated onto a wall surface or the like, Example 3 is most preferable, Example 1 is second most preferable, and Example 2 is third most preferable.

[0080] (2) Efficiency Higher efficiency is preferable for the lighting device 1. Therefore, from the viewpoint of efficiency, the comparative example is most preferable, followed by Examples 1, 2 and 4, which have efficiencies of 60% or more, and then Example 4.

[0081] Furthermore, in terms of the light distribution on the irradiated surface and the brightness of the inner peripheral edge 211 in addition to the efficiency, Example 1 is most preferable, and Example 2 is second most preferable.

[0082] (3)Reflectance It is preferable that the reflectance of the packing is high, for example, 92.8% or more.

[0083] Further consideration based on the above-mentioned embodiment has revealed that the reflectance of the packing is preferably 15% or more and 99% or less, and more preferably 50% or more and 99% or less.

[0084] <2.1.Effects> The lighting devices according to Examples 1 to 3 of this embodiment can improve the uniformity of light distribution on the surface to be illuminated, and can prevent people who look up at the lighting devices from feeling uncomfortable, compared to the lighting device according to Example 4 and the comparative example. Furthermore, the lighting devices according to Examples 1 and 2 of this embodiment are more efficient than the lighting device according to Example 3, and are therefore preferable.

[0085] Therefore, the lighting devices according to Examples 1 and 2 of this embodiment can improve the uniformity of light distribution on the surface to be illuminated, can prevent people who look up at the lighting device from feeling uncomfortable, and can achieve high efficiency.

[0086] <5. Other variations> (1) Light-emitting element included in the light source 30 In the above embodiment, the light source 30 has been described as having an SMD-type LED as a light-emitting element and emitting light of three colors, but the present invention is not limited to this.

[0087] The light emitting elements of the light source 30 are not limited to the SMD type LED group 32, but may be surface-emitting elements such as COB (Chip On Board) type LEDs or organic EL (Electro Luminescence) elements. The light emitting elements of the light source 30 may also be a combination of multiple types of light emitting elements, such as an element in which a CSP (Chip Scale Package) type LED is arranged on the light emitting area of ​​a COB type LED.

[0088] Furthermore, the number of types and colors of light emitted by light source 30 does not have to be three, but may be any number. For example, light source 30 may emit light of one color, or light of four or more colors.

[0089] (2) Diffusion of light by the light diffusion plate 50 In the above embodiment, an example has been described in which the light diffusion plate 50 is used to diffuse the light emitted by the light source 30. However, the present invention is not limited to this.

[0090] A lens may be used instead of the light diffusion plate 50 to diffuse the light emitted by the light source 30. In this case, a Fresnel lens, which is a thin lens, or a lens made up of a combination of multiple small lenses may be used as the lens. Alternatively, a so-called diffusion lens may be used as the lens.

[0091] For example, when lighting a wall surface using the lighting device 1, by using a lens instead of the light diffusion plate 50, it is possible to spread the illumination light over the wall surface and achieve lighting with a high degree of uniformity of light distribution.

[0092] Furthermore, even when the light diffusion plate 50 is used, the light diffusion plate 50 does not have to be a milky white light diffusion plate made of acrylic. For example, the light diffusion plate 50 may be a transparent flat plate with roughened incident and exit surfaces. Furthermore, the light diffusion plate 50 may be a flat plate containing a diffusing material.

[0093] (3) Characteristics of the light diffusion plate 50 In the above embodiment, an example has been described in which the light diffusion plate 50 used as a light-transmitting member diffuses incident light and emits the diffused light, but the present invention is not limited to this.

[0094] The light-transmitting member may be a transparent plate that does not diffuse incident light, and may be made of, for example, transparent acrylic.

[0095] (4) Application to devices other than downlights In the above embodiment, the lighting device 1 is described as a downlight that is used in a state where it is embedded and fixed in the ceiling 350 and emits light downward from the ceiling 350. However, the present invention is not limited to this.

[0096] The lighting device 1 may be a spotlight or a universal downlight that can change the direction of light irradiation.

[0097] (5) Control of multiple lighting devices 1 and wired control In the above embodiment, an example has been described in which one lighting device 1 emits light in response to a control instruction wirelessly transmitted from the tablet 300. However, the present invention is not limited to this.

[0098] The tablet 300 may wirelessly transmit control instructions to multiple lighting devices 1. Alternatively, the tablet 300 may wiredly transmit control instructions to one or multiple lighting devices 1. Alternatively, the tablet 300 may not be a portable information terminal device, but may be a terminal device fixed to a wall or the like.

[0099] (6) Packing (6-1) Thickness of packing In the above embodiment, the thicknesses of the inner edge portion 63, the connecting portion 62, and the outer edge portion 61 of the packing 60 are exemplified, but the thicknesses of the inner edge portion 63, the connecting portion 62, and the outer edge portion 61 are not limited to the exemplified ranges. Specifically, when the reflectance of the surface of the packing 60 is within the reflectance range that the packing 60 should satisfy, the thicknesses of the inner edge portion 63, the connecting portion 62, and the outer edge portion 61 of the packing 60 are arbitrary.

[0100] (6-2) Packing color In the above-described embodiment, the color of the packing is exemplified. However, the color of the packing is not limited to the exemplified range, and it may be gray, etc. The color of the packing is arbitrary as long as the above-described packing satisfies the required optical characteristics.

[0101] <6. Extraction of inventions> The following inventions can be cited as examples of inventions extracted from the above-described embodiments and modifications.

[0102] (1) An illumination device according to one embodiment of the present invention comprises a light source that emits light, an auxiliary reflective member that receives the light emitted from the light source through a first upper opening having an inner peripheral edge and causes the light that has entered through the first upper opening to exit through a first lower opening, and a covering member that covers the inner peripheral edge of the auxiliary reflective member and diffuses and reflects the light that has entered toward the inner peripheral edge of the auxiliary reflective member.

[0103] With the above-described configuration, the lighting device according to one embodiment of the present invention can suppress the occurrence of uneven light on the surface to be illuminated and improve the uniformity of light distribution on the surface to be illuminated.

[0104] (2) The above lighting device may further include a reflecting member through which light emitted by the light source enters through a second upper opening and causes the light entering through the second upper opening to exit through a second lower opening, and the light exiting from the reflecting member may enter the first upper opening provided in the auxiliary reflecting member.

[0105] With these configurations, in the lighting device according to one embodiment of the present invention, light emitted from the reflective member is incident on the auxiliary reflective member. Because the light emitted from the light source is reflected by both the reflective member and the auxiliary reflective member, the light emitted from the auxiliary reflective member is more diffused than when the light is reflected only by the auxiliary reflective member. Therefore, the light distribution uniformity on the illuminated surface can be more reliably improved.

[0106] (3) In the above lighting device, the reflectance of the surface of the covering member may be 15% or more.

[0107] With these configurations, the lighting device according to one embodiment of the present invention can reflect light incident toward the inner peripheral edge of the auxiliary reflecting member, thereby improving the uniformity of light distribution on the surface to be illuminated.

[0108] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-described embodiments, but should be defined by the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0109] 1,1a,1b,1c,3 Lighting device 2 lamps 10. Cabinet 11 Heat sink fixing screws 12 Joint 20 Corn 21 First upper opening 22 first inner peripheral surface 23 First lower opening 30 light source 31 PCB 32 LED groups 33a, 33b, 33c LEDs 34 screw holes 40 Reflector 41 feet 42 Reflector fixing screw 43 Second inner surface 44 Second upper opening 45 Second lower opening 50 Light diffuser 60, 60a, 60b, 60c packing 61 outer edge 62 Connection 63 Inner edge 70 Heatsink 73 Plane part 74 Thermal Conduction Materials 80 frame 81 Mounting spring 82 Claw 83 Frame body 84 holes 100 power supply 101 Power supply cable 211 Inner edge 300 tablets 301 Touch Panel 350 ceiling 351 Embedded hole 361,362 arrows 601,611 Optical Edge 603,613 areas 1000 Lighting System D1, D2, D3 thickness L center axis L11,L12,L21,L22,L23a,L23b,L23c Optical path

Claims

1. a light source that emits light; an auxiliary reflecting member that receives light emitted from the light source through a first upper opening having an inner peripheral edge and causes the light that has entered through the first upper opening to exit through a first lower opening; a covering member that covers the inner peripheral edge of the auxiliary reflecting member and diffuses and reflects light that is incident toward the inner peripheral edge of the auxiliary reflecting member; Equipped with Lighting equipment.

2. a reflecting member that receives light emitted from the light source through a second upper opening and causes the light that has entered through the second upper opening to exit through a second lower opening, The light emitted from the reflecting member is incident on the first upper opening of the auxiliary reflecting member. The lighting device according to claim 1 .

3. The reflectance on the surface of the coating member is 15% or more.

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

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