Light source unit and lighting fixture

Abstract

To provide a light source unit that enables suppression of discomfort glare. [Solution] The light source (22) unit (U2) comprises a light source (22) that emits light, a light cover part (80) that covers the light source (22), and a plurality of ribs (8) arranged on a pair of opposing side surfaces of the light cover part (80), and at least one of the plurality of ribs (8) has a first surface (F1) on the side closer to the light source (22) and a second surface (F2) on the side farther from the light source (22), and the first surface (F1) is more inclined than the second surface (F2) with respect to a vertical plane perpendicular to the optical axis of the light.

Description

[Technical Field]

[0001] The present disclosure relates to a light source unit and a lighting fixture. [Background technology]

[0002] Known methods for suppressing discomfort glare (discomfort caused by brightness) in lighting fixtures include shading the sides of the lighting fixtures and attaching louvers (light-blocking plates).

[0003] An example of a conventional lighting fixture is the lighting device described in Patent Document 1 below. The lighting device in Patent Document 1 relates to an improvement to an LED lighting device that is directly attached to a ceiling surface or the like, and in particular to smooth and appropriate attachment of a light-emitting unit to the fixture body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2015-032460 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although Patent Document 1 discloses an illumination device that causes the side surface of the light-emitting unit to emit light, it does not disclose a specific configuration for suppressing discomfort glare.

[0006] The present disclosure has been made in view of the above problems, and provides a light source unit and a lighting fixture that enable suppression of discomfort glare. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a light source unit according to one embodiment of the present disclosure comprises a light source that emits light, a light cover portion that covers the light source, and a plurality of ribs arranged on a pair of opposing side surfaces of the light cover portion, wherein at least one of the plurality of ribs has a first surface on a side closer to the light source and a second surface on a side farther from the light source, and the first surface is more inclined than the second surface with respect to a vertical plane perpendicular to the optical axis of the light. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, it is possible to provide a light source unit and a lighting fixture that enable suppression of discomfort glare. [Brief explanation of the drawings]

[0009] [Figure 1] 1 shows a perspective view of a lighting fixture according to the present disclosure. [Figure 2] 1 shows an exploded perspective view of a lighting fixture according to the present disclosure. [Figure 3] 1 shows a cross-sectional view of a lighting fixture according to the present disclosure. [Figure 4] 10A and 10B are diagrams for explaining a light cover unit according to the present disclosure. [Figure 5] 1 shows a schematic cross-sectional view of a rib and the trajectory of light passing through the rib according to the present disclosure. [Figure 6] 10 shows a cross-sectional view of another optical cover portion according to the present disclosure. [Figure 7] 10 shows a cross-sectional view of another optical cover portion according to the present disclosure. [Figure 8] 10 shows a cross-sectional view of another optical cover portion according to the present disclosure. [Figure 9] 10 shows a cross-sectional view of another optical cover portion according to the present disclosure. [Figure 10] 10 shows a cross-sectional view of another optical cover portion according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0011] The lighting fixture 1 will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing the lighting fixture 1. Figure 2 is an exploded perspective view showing the lighting fixture 1.

[0012] As shown in Figures 1 and 2, the lighting fixture 1 is, for example, a direct lighting fixture. The lighting fixture 1 emits light. The lighting fixture 1 extends along a first direction P. The first direction P indicates the longitudinal direction of the lighting fixture 1. Specifically, the lighting fixture 1 includes a base unit U1 and a light source unit U2.

[0013] The base unit U1 includes a base member 11, a first closing member 12, and a power supply unit 13.

[0014] The base member 11 extends along a first direction P.

[0015] The base member 11 is a member for installing the light source unit U2 on a mounting body. The mounting body is a member capable of supporting the lighting fixture 1, such as the ceiling surface of a room in a building. The base member 11 is attached to the mounting body.

[0016] The first closing member 12 is disposed at an end of the base member 11 in the first direction P. The first closing member 12 closes the end of the base member 11 in the first direction P.

[0017] A direction perpendicular to the first direction P and perpendicular to the second direction Q is referred to as a third direction R.

[0018] The power supply unit 13 supplies power to the light source unit U2. The power supply unit 13 is disposed inside C of the base member 11.

[0019] The light source unit U2 extends along the first direction P. Specifically, the light source unit U2 includes a light emitting module 20, a cover member 30, a second closing member 40, a holding member 50, an attachment member 60, and a mounting member 70.

[0020] The light source unit U2 is detachable from the base member 11. That is, the light source unit U2 is separate from the base member 11 and has a configuration that allows it to be detachable from the base member 11. In this embodiment, the light source unit U2 is configured to be detachable from the base member 11 by an attachment member 60.

[0021] The light emitting module 20 emits light. The light emitting module 20 is, for example, an LED (Light Emitting Diode) module. The light emitting module 20 extends along a first direction P. Specifically, the light emitting module 20 includes a mounting member 21 and one or more light sources 22. The mounting member 21 is, for example, a substrate. The mounting member 21 has, for example, a substantially flat plate shape. The mounting member 21 extends along the first direction P. One or more light sources 22 are mounted on the mounting member 21. In the present embodiment, multiple light sources 22 are mounted on the mounting member 21. In the present embodiment, the multiple light sources 22 are arranged in a row along the first direction P. Each of the multiple light sources 22 emits light. Each of the multiple light sources 22 is, for example, a light emitting element such as an LED. Specifically, each of the multiple light sources 22 is, for example, an SMD (surface mount device) element. The light source 22 made of SMD is formed, for example, in the shape of a substantially rectangular parallelepiped, and emits light from one of six peripheral surfaces (the surface behind the surface facing the mounting member 21). In this embodiment, the surface facing the mounting member 21 is the light source attachment surface 22b (FIG. 3). Also, in this embodiment, the surface behind the surface facing the mounting member 21 is the light emitting surface 22a (FIG. 3). Each of the multiple light sources 22 may be a COB (chip on board) element.

[0022] The holding member 50 holds the mounting member 21. The holding member 50 is made of, for example, metal (for example, aluminum).

[0023] The cover member 30 has a light cover portion 80 .

[0024] The light cover portion 80 transmits light emitted by the plurality of light sources 22. The light cover portion 80, for example, diffuses the light emitted by the plurality of light sources 22.

[0025] The light cover portion 80 is made of, for example, a synthetic resin. The light cover portion 80 may be, for example, white and translucent. The light cover portion 80 may be formed by molding a resin containing a light diffusing material, or may be formed by molding a transparent material and then applying a light diffusing treatment to the surface.

[0026] The optical cover portion 80 extends along the first direction P. The optical cover portion 80 has a first cover portion 80a, a second cover portion 80b, and a third cover portion 80c. The first cover portion 80a, the second cover portion 80b, and the third cover portion 80c each have, for example, a substantially flat plate shape. The first cover portion 80a and the second cover portion 80b face each other at an interval along the second direction Q. The third cover portion 80c is interposed between the first cover portion 80a and the second cover portion 80b.

[0027] The interior D of the optical cover portion 80 is a cavity. The interior D of the optical cover portion 80 is a space surrounded by the inner surface of the optical cover portion 80. Specifically, the interior D of the optical cover portion 80 is a space sandwiched between the first cover portion 80a and the second cover portion 80b.

[0028] The light cover portion 80 transmits the light emitted by the plurality of light sources 22 and emits it to the outside of the light cover portion 80. The outside of the light cover portion 80 refers to a space located outside the interior D of the light cover portion 80.

[0029] The second closing member 40 is disposed at an end of the light cover portion 80 in the first direction P. The second closing member 40 closes the end of the light cover portion 80 in the first direction P.

[0030] Next, the lighting device 1 will be further described with reference to Figures 3 and 4. Figure 3 is a cross-sectional view of the lighting device 1 taken along line III-III shown in Figure 1. Figure 4 is a diagram illustrating the light cover portion 80.

[0031] As shown in FIGS. 3 and 4, the base member 11 has, for example, a generally U-shaped cross section. A first opening 14 is formed in the base member 11. The first opening 14 is located at the end of the base member 11 on the other side R2 in the third direction R. The first opening 14 is a region between the first end 11d and the second end 11e. The first end 11d is the end of the first base portion 11a on the other side R2 in the third direction R. The second end 11e is the end of the second base portion 11b on the other side R2 in the third direction R. The first opening 14 connects the interior C of the base member 11 with the outside of the base member 11.

[0032] The light cover portion 80 has, for example, a generally U-shaped cross section. The light cover portion 80 covers the plurality of light sources 22. The light cover portion 80 is located on the other side R2 in the third direction R with respect to the plurality of light sources 22. Therefore, the light cover portion 80 covers the plurality of light sources 22 from the other side R2 in the third direction R.

[0033] A second opening 81 is formed in the optical cover portion 80. The second opening 81 communicates between the interior D of the optical cover portion 80 and the outside. The second opening 81 is located at an end of the optical cover portion 80 on one side R1 in the third direction R. The second opening 81 is a region between the third end 80d and the fourth end 80e. The third end 80d is an end of the first cover portion 80a on one side R1 in the third direction R. The fourth end 80e is an end of the second cover portion 80b on one side R1 in the third direction R. The second opening 81 communicates between the interior D of the optical cover portion 80 and the outside of the optical cover portion 80.

[0034] The dimension α1 of the light cover portion 80 in the second direction Q is substantially equal to the dimension α2 of the base member 11 in the second direction Q (α1≒α2). Specifically, the dimension α1 indicates the dimension from the outer side of the third end 80d to the outer side of the fourth end 80e. Specifically, the dimension α2 indicates the dimension from the outer side of the first end 11d to the outer side of the second end 11e. Therefore, when the light source unit U2 is attached to the base member 11, the third end 80d contacts the first end 11d, and the fourth end 80e contacts the second end 11e. As a result, the light cover portion 80 is restricted from entering the interior C of the base member 11. In other words, the light cover portion 80 is formed so as not to enter the interior C of the base member 11.

[0035] The following describes one of the plurality of light sources 22. This is because, in this embodiment, the plurality of light sources 22 have similar configurations.

[0036] The light source 22 has a light-emitting surface 22a, a light-source mounting surface 22b, and a side surface 22c. The light-source mounting surface 22b is the surface of the light source 22 that faces the mounting member 21. Therefore, the light-source mounting surface 22b of the light source 22 is mounted to the mounting member 21.

[0037] The light-emitting surface 22a is disposed on the rear side of the light-source mounting surface 22b, and the side surface 22c is disposed between the light-emitting surface 22a and the light-source mounting surface 22b.

[0038] The light-emitting surface 22a is a surface that emits light of the light source 22. Therefore, the light source 22 of this embodiment emits light from the light-emitting surface 22a among the light-emitting surface 22a, the light-source mounting surface 22b, and the side surface 22c.

[0039] The light source 22 faces the interior D of the light cover section 80 and is disposed outside the light cover section 80. Specifically, the light emitting surface 22a of the light source 22 faces the interior D of the light cover section 80 and is disposed outside the light cover section 80. Therefore, the light source 22 emits light from the light emitting surface 22a into the interior D of the light cover section 80. As a result, the light emitted into the interior D of the light cover section 80 passes through the light cover section 80 and is emitted to the outside of the light cover section 80.

[0040] In this embodiment, specifically, the light emitting surface 22a of the light source 22 faces the interior D of the light cover unit 80 via the second opening 81. The light source 22 emits light from the light emitting surface 22a into the interior D of the light cover unit 80 via the second opening 81.

[0041] The mounting member 60 is attached to the holding member 50. Specifically, the mounting member 60 is attached to the mounting surface 53 of the holding member 50. The mounting member 60 has elasticity and is made of metal (for example, stainless steel).

[0042] The mounting member 60 is fixed to the base member 11. Specifically, with the entry portion 90 entering the interior C of the base member 11, the elasticity of the mounting member 60 causes the mounting member 60 to be pressed against the inner surface of the base member 11. As a result, the light source unit U2 is attached to the base member 11.

[0043] When the light source unit U2 is attached to the base member 11, the light source unit U2 is held by the base member 11. As a result, the light source unit U2 is attached to the mounting body via the base member 11 and installed on the mounting body.

[0044] When the light source unit U2 is attached to the base member 11, the light source unit U2 can be pulled and removed from the base member 11. In other words, by releasing the base member 11 from the elastic force of the mounting member 60, the light source unit U2 can be removed from the base member 11.

[0045] As described above with reference to FIGS. 3 and 4 , the multiple light sources 22 face the interior D of the light cover unit 80 and are arranged outside the light cover unit 80. Specifically, the light-emitting surface 22a of each of the multiple light sources 22 faces the interior D of the light cover unit 80 and is arranged outside the light cover unit 80. Therefore, by arranging the multiple light sources 22 at a distance from the light cover unit 80, it is possible to make the light emitted by the multiple light sources 22 reach a wide area of ​​the light cover unit 80. In other words, the light traveling from the light-emitting surface 22a of each of the multiple light sources 22 while spreading at a predetermined angle (e.g., 120 degrees) can enter the interior D of the light cover unit 80 and reach the vicinity of the upper ends of the first cover unit 80a and the second cover unit 80b of the light cover unit 80. As a result, it is possible to make almost the entire light cover unit 80 emit light, and it is possible to reduce uneven light emission that occurs in the light cover unit 80.

[0046] The holding member 50 holds the mounting member 21 on which the plurality of light sources 22 are mounted. The holding member 50 is disposed outside the light cover unit 80. Therefore, the plurality of light sources 22 are disposed outside the light cover unit 80. As a result, it is possible to reduce uneven light emission that occurs in the light cover unit 80.

[0047] Furthermore, the holding member 50 is disposed outside the light cover portion 80. Therefore, with the interior C of the light cover portion 80 closed, the mounting member 21 can be smoothly attached to and detached from the holding member 50. In other words, with the pair of second closure members 40 attached to the light cover portion 80, the mounting member 21 can be smoothly attached to and detached from the holding member 50. As a result, the ease of assembly of the light source unit U2 can be improved.

[0048] Next, the light source unit U2 when attached to the base member 11 will be described with reference to FIG.

[0049] As shown in FIG. 3, in a state where the light source unit U2 is attached to the base member 11, the light cover portion 80 is disposed outside the base member 11.

[0050] When the light source unit U2 is attached to the base member 11, the plurality of light sources 22 face the interior D of the light cover portion 80 and are arranged outside the light cover portion 80. When the light source unit U2 is attached to the base member 11, the plurality of light sources 22 are arranged inside C of the base member 11. When the light source unit U2 is attached to the base member 11, the plurality of light sources 22 are arranged so as to intersect with the central axis β.

[0051] 3, the plurality of light sources 22 are disposed inside C of the base member 11. Therefore, the plurality of light sources 22 can be disposed apart from the light cover portion 80, thereby making it possible to reduce uneven light emission that occurs in the light cover portion 80.

[0052] Furthermore, by arranging the plurality of light sources 22 inside C of the base member 11, the distance between the plurality of light sources 22 and the lower part (third cover part 80c) of the light cover part 80 can be increased. Therefore, in the lower part of the light cover part 80, the difference between the brightness directly below the light source 22 and the brightness of the surrounding area directly below the light source 22 can be reduced. As a result, when the light cover part 80 is viewed from below, it is possible to prevent dark areas from occurring in places of the light cover part 80 that are located between adjacent light sources 22, and it is possible to reduce uneven light emission occurring in the lower part of the light cover part 80.

[0053] (rib) As described above, the optical cover unit 80 has a first cover unit 80a, a second cover unit 80b, and a third cover unit 80c, and the first cover unit 80a and the second cover unit 80b face each other at an interval along the second direction Q. The first cover unit 80a and the second cover unit 80b have shapes symmetrical to each other with respect to the central axis β. The first cover unit 80a and the second cover unit 80b are a pair of opposing side surfaces of the optical cover unit 80.

[0054] The central axis β passes through the center of the light cover unit 80 in the second direction Q and extends along the third direction R. The central axis β can also be considered as the optical axis of the light source 22. The optical axis may be defined as the direction at 0° in the light distribution, or as the direction in which light mainly emerges overall.

[0055] The ribs 8 are provided on a pair of opposing side surfaces of the optical cover portion 80, that is, a first cover portion 80a and a second cover portion 80b. The ribs 8 will be described with reference to FIG.

[0056] Fig. 4 is a diagram for explaining the optical cover unit 80. In Fig. 4, the diagram indicated by reference number 400 in Fig. 4 shows a cross-sectional view of the optical cover unit 80. The diagram indicated by reference number 401 in Fig. 4 shows a perspective view of the optical cover unit 80.

[0057] Referring to the drawing indicated by reference numeral 400, the rib 8 is composed of a rib 8a and a rib 8b in one embodiment. When there is no need to distinguish between the rib 8a and the rib 8b, they may be simply referred to as the rib 8.

[0058] Referring to the view indicated by reference numeral 401 in FIG. 4, the rib 8a is arranged inside the first cover portion 80a and the second cover portion 80b in the first direction P. The rib 8b is arranged outside the first cover portion 80a and the second cover portion 80b in the first direction P. The rib 8a is closer to the light source 22 than the rib 8b. The rib 8 may be integrally molded with the light cover portion 80. The rib 8 may be formed as a separate member from the light cover portion 80. In the following description, the rib 8 is described as being integrally molded with the light cover portion 80. The rib 8a and the rib 8b may have the same shape as each other, or may have different shapes. In FIG. 4, the rib 8a and the rib 8b are assumed to have the same shape as each other.

[0059] Next, the rib 8 and the function of the rib 8 will be described with reference to Fig. 5. Fig. 5 shows a schematic cross-sectional view of the rib 8 and the trajectory of light passing through the rib 8. In Fig. 5, the rib 8a is used as an example for explanation, but the rib 8b may be used instead of the rib 8a. Furthermore, a vertical plane perpendicular to the optical axis of the light, which will be described later, corresponds to a plane defined by the first direction P and the second direction Q.

[0060] The rib 8a has a first surface F1 on the side closer to the light source 22 and a second surface F2 on the side farther from the light source 22. The light source 22 is provided in the upward direction (one side R1 in the third direction R). In one embodiment, the first surface F1 is formed as a curved surface that curves toward the light source 22 so as to easily refract light incident on the first surface F1. When viewed as a whole, it can be said that the first surface F1 is inclined with respect to a vertical plane perpendicular to the optical axis of the light. The first surface F1 may also be spherical in cross section, curved toward the light source 22. The second surface F2 is parallel to the vertical plane perpendicular to the optical axis of the light. Therefore, the first surface F1 is more inclined with respect to the vertical plane perpendicular to the optical axis of the light than the second surface F2. Other embodiments of the rib 8 will be described with reference to FIGS. 6 to 10. In all cases, the first surface F1 is more inclined with respect to the vertical plane perpendicular to the optical axis of the light than the second surface F2.

[0061] Next, the trajectory of light passing through the rib 8 will be described. Fig. 5 shows light L1 and light L2 from the light source 22 (not shown). As described above, the rib 8 is formed integrally with the light cover portion 80, and the light cover portion 80 and the rib 8 are made of, for example, a synthetic resin. When light from the light source 22 enters the rib 8, at least a portion of the light L1 and light L2 is refracted at the first surface F1 due to the difference in refractive index between air and the rib 8.

[0062] In the example in FIG. 5, the light L2 passes through the inside of the rib 8, passes through the second cover portion 80b without reaching the second surface F2, and travels downward (toward the other side R2 in the third direction R).

[0063] Light L1 passes through the interior of the rib 8 and reaches the second surface F2, which is the interface between the rib 8 and air. Generally, when light enters a medium with a high refractive index from a medium with a low refractive index, the light undergoes total internal reflection if the angle of incidence into the medium with a low refractive index is equal to or greater than the critical angle. Similarly, when light enters a medium with a high refractive index from a medium with a low refractive index, the light is refracted if the angle of incidence into the medium with a low refractive index is smaller than the critical angle. As shown in FIG. 5, in the case of light L1, the light undergoes total internal reflection at the second surface F2 and travels upward (one side R1 of the third direction R). Alternatively, the second surface F2 may radiate light downward (the other side R2 of the third direction R) at an angle θ<55°. In FIG. 5, light L3 entering the rib 8a from the far side of the paper is shown by a dashed line. In the case of light L3, the light is radiated downward (the other side R2 of the third direction R) at an angle θ<55° at the second surface F2.

[0064] In this way, by tilting the first surface F1 more than the second surface F2 with respect to a vertical plane perpendicular to the optical axis of the light, the rib 8 controls the distribution of light incident on the rib 8.

[0065] 5 shows θ. θ indicates the angle with respect to the third direction R on the other side R2 of the third direction R. By controlling the distribution of light incident on the rib 8, the rib 8 can reduce the luminous flux traveling toward 55°≦θ≦90°, particularly 60°≦θ≦90°, without using a shielding member. As a result, the light source unit U2 (lighting device 1) according to the present disclosure reduces the luminance when a person looks up at the light source unit U2 (lighting device 1) from diagonally below.

[0066] As a result, compared to conventional methods for suppressing discomfort glare, such as blocking light radiation to the sides, reducing brightness, or narrowing the light distribution angle, light source unit U2 (lighting fixture 1) can maintain light utilization efficiency while widening the light distribution angle. In other words, light source unit U2 (lighting fixture 1) does not cut (block) light, but rather divides it into multiple directions, thereby maintaining light utilization efficiency and also maintaining its function as a base light.

[0067] Generally, specifications of base lights vary depending on the product, such as the shape (height, width, etc.) of the light cover part, the distance between the light source and the side of the light cover part, etc. Therefore, the number of ribs 8a and ribs 8b or their attachment positions may be designed according to the specifications of the base light, thereby realizing suppression of discomfort glare.

[0068] In FIG. 5, the first surface F1 is curved in cross section. However, the first surface F1 may have a shape that includes at least a curved portion that curves toward the light source 22. Alternatively, the first surface F1 may be flat without including a curved portion. In either case, the first surface F1 is tilted more than the second surface F2 with respect to a vertical plane perpendicular to the optical axis of the light. This allows the light source unit U2 (lighting device 1) to reflect light upward (one side R1 of the third direction R) from the second surface F2 while also emitting light downward (the other side R2 of the third direction R at an angle θ<55°), thereby reducing the glare felt by humans and suppressing discomfort glare. Furthermore, the above configuration can achieve a UGR of 19 or less.

[0069] The rib 8 is made up of a plurality of ribs, but it is not necessary for all of the ribs to have the above-mentioned configuration, and they may be adjusted as appropriate within the range in which discomfort glare is suppressed.

[0070] The second surface F2 has been described as being parallel to a vertical plane perpendicular to the optical axis of the light. However, the second surface F2 does not need to be strictly parallel to the vertical plane perpendicular to the optical axis of the light, and may have a slight inclination. The second surface F2 may be formed so that the inclination with respect to the vertical plane perpendicular to the optical axis of the light gradually changes along the optical axis direction. Furthermore, the second surface F2 does not necessarily have to be formed flat, as long as the rib 8 can control the distribution of the light L1 and the light L2 as described above. The second surface F2 may be formed so that the curvature gradually changes along the optical axis direction. The above also applies to the light cover units 80B to 80E according to other embodiments shown in FIGS. 6 to 10, which will be described later.

[0071] Furthermore, referring to the diagram indicated by reference numeral 401 in FIG. 4, rib 8a is positioned closer to light source 22 than rib 8b. The angle of incidence from light source 22 to second surface F2 changes depending on the distance from light source 22, and the ease of total reflection also changes depending on the angle of incidence. For this reason, rib 8a, which is closer to light source 22, is positioned inside first cover portion 80a and second cover portion 80b, and rib 8b, which is farther from light source 22, is positioned outside first cover portion 80a and second cover portion 80b. With such an arrangement, light source unit U2 (lighting fixture 1) reduces the glare felt by humans and makes it easier to suppress discomfort glare.

[0072] (Another embodiment of the optical cover portion) Next, another embodiment of the optical cover section 80 according to the present disclosure will be described with reference to Figures 6 to 10. Only the differences from the optical cover section 80 described above will be described below.

[0073] 6 shows a cross-sectional view of another optical cover part 80A according to the present disclosure. In the optical cover part 80A, the ribs 8b are not provided on the outer sides of the first cover part 80a and the second cover part 80b, but the ribs 8a are formed on the entire inner sides of the first cover part 80a and the second cover part 80b.

[0074] 7 shows a cross-sectional view of another optical cover part 80B according to the present disclosure. In the optical cover part 80B, the ribs 8a are not provided on the inside of the first cover part 80a and the second cover part 80b, but the ribs 8b are formed on the entire outside of the first cover part 80a and the second cover part 80b.

[0075] FIG. 8 shows a cross-sectional view of another optical cover unit 80C according to the present disclosure. In the optical cover unit 80C, the ribs 8a are arranged inside the optical cover unit 80. The ribs 8b are arranged outside the optical cover unit 80. Compared to the ribs 8a and 8b in the aforementioned optical cover unit 80, the ribs in the optical cover unit 80C are smaller in size. Specifically, the ribs 8a and 8b in the optical cover unit 80C are narrower in width in the optical axis direction of the light source 22 and are also shorter in height in the direction perpendicular to the optical axis. Furthermore, the rib 8a has a first surface F1 that is flat rather than curved in cross section. Therefore, the rib 8a is triangular in cross section. In contrast, the rib 8b has a first surface F1 that is curved in cross section.

[0076] FIG. 9 shows a cross-sectional view of another optical cover unit 80D according to the present disclosure. In the optical cover unit 80D, the ribs 8a are arranged inside the optical cover unit 80. The ribs 8b are arranged outside the optical cover unit 80. Compared to the ribs 8a and 8b in the optical cover unit 80 described above, the ribs in the optical cover unit 80D are larger in size. Specifically, the ribs 8a and 8b in the optical cover unit 80C are wider in the optical axis direction of the light source 22 and taller in the direction perpendicular to the optical axis. Furthermore, the ribs 8a and 8b each have a planar first surface F1 in cross-sectional view. Therefore, the ribs 8a and 8b each have a triangular shape in cross-sectional view.

[0077] 10 shows a cross-sectional view of another optical cover unit 80E according to the present disclosure. In the optical cover unit 80E, ribs 8a are not provided on the inside of the first cover unit 80a and the second cover unit 80b, and ribs 8b are formed on the entire outside of the first cover unit 80a and the second cover unit 80b. In addition, the first cover unit 80a and the second cover unit 80b each incline toward the central axis β as they move toward one side R1 of the third direction R. As a result, the optical cover unit 80E is trapezoidal in cross-section.

[0078] The light cover units 80B to 80E according to other embodiments have been described above with reference to FIGS. 6 to 10. The light source unit U2 (lighting device 1) according to the present disclosure, including any of the light cover units 80B to 80E, reduces the luminance when a person looks up at the light source unit U2 (lighting device 1) from diagonally below, based on the same principle as that described with reference to the light cover unit 80. This allows the light source unit U2 (lighting device 1) to reduce the glare felt by people and suppress discomfort glare. Furthermore, a UGR of 19 or less may be achieved.

[0079] Furthermore, in the present disclosure, the shapes of the ribs 8a and / or ribs 8b of the light cover units 80B to 80E may be combined with each other. For example, in the light cover unit 80C described with reference to FIG. 8, each rib is formed with a thinner size. In the light cover unit 80D described with reference to FIG. 9, each rib is formed with a larger size. In the light cover unit including these ribs with a combination of large and small sizes, the present disclosure reduces the luminance when a person looks up at the light source unit U2 (lighting device 1) from diagonally below, using the same principle as described with reference to the light cover unit 80. This allows the light source unit U2 (lighting device 1) to reduce the glare felt by people and suppress discomfort glare. Furthermore, a UGR of 19 or less may be achieved.

[0080] In this way, the light source unit U2 (lighting fixture 1) can be applied with light cover portions 80 having various shapes. As mentioned above, the shape (height, width, etc.) of the light cover portion and the distance between the light source and the side surface of the light cover portion vary depending on the base light product. Therefore, the shape of the light cover portion 80, the number and attachment positions of the ribs 8a and / or ribs 8b, the shape of the first surface F1, and other factors can be designed according to the specifications of the base light to suppress discomfort glare. Furthermore, it is even more preferable to achieve a UGR of 19 or less.

[0081] The present disclosure also includes a lighting fixture comprising the aforementioned light source unit U2 and a base member 11 that can be attached to a member (mounting body) capable of supporting the lighting fixture 1, such as the ceiling surface of a room in a building, to which the light source unit U2 can be attached and detached.

[0082] (summary) The light source unit according to aspect 1 of the present disclosure comprises a light source that emits light, a light cover portion that covers the light source, and a plurality of ribs arranged on a pair of opposing side surfaces of the light cover portion, wherein at least one of the plurality of ribs has a first surface on a side closer to the light source and a second surface on a side farther from the light source, and the first surface is more inclined than the second surface with respect to a vertical plane perpendicular to the optical axis of the light.

[0083] According to the above configuration, the light source unit according to the first aspect of the present disclosure reduces the luminance when a person looks up at the light source unit from diagonally below. As a result, the light source unit according to the first aspect of the present disclosure can reduce the glare felt by people by minimizing the emission of light at an emission angle of 55° to 90°.

[0084] A light source unit according to a second aspect of the present disclosure is related to the first aspect, wherein the first surface of each of the plurality of ribs is more inclined with respect to the vertical surface than the second surface.

[0085] According to the above configuration, the light source unit according to aspect 2 of the present disclosure is the same as in aspect 1, but further avoids emitting light at an emission angle of 55° to 90° as much as possible, thereby reducing the glare felt by humans.

[0086] A light source unit according to aspect 3 of the present disclosure is the same as that of aspect 1 or 2, in which some of the ribs are arranged inside the light cover portion and other parts are arranged outside the light cover portion, and the ribs arranged inside the light cover portion are closer to the light source than the ribs arranged outside the light cover portion.

[0087] According to the above configuration, the light source unit according to aspect 3 of the present disclosure, in accordance with aspect 1 or 2, further avoids emitting light at an emission angle of 55° to 90° as much as possible, thereby reducing the glare felt by humans.

[0088] A light source unit according to a fourth aspect of the present disclosure is the light source unit of any one of the first to third aspects, wherein the first surface at least partially includes a curved portion that curves toward the light source.

[0089] According to the above configuration, the light source unit according to aspect 4 of the present disclosure is any one of aspects 1 to 3, and further, by avoiding emitting light at an emission angle of 55° to 90° as much as possible, it is possible to reduce the glare felt by humans.

[0090] A light source unit according to a fifth aspect of the present disclosure is any one of the first to fourth aspects, wherein the second surface is parallel to the vertical surface.

[0091] According to the above configuration, the light source unit according to aspect 5 of the present disclosure is any one of aspects 1 to 4, and further, by minimizing the emission of light at an emission angle between 55° and 90°, the glare felt by humans can be reduced.

[0092] A lighting fixture according to a sixth aspect of the present disclosure includes the light source unit according to any one of the first to fifth aspects, and a base member attached to a mounting body and to which the light source unit is detachable.

[0093] The lighting device according to aspect 6 of the present disclosure includes the light source unit according to any one of aspects 1 to 5, and by minimizing the emission of light at an emission angle between 55° and 90°, the glare felt by humans can be reduced.

[0094] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the disclosed technical means are also included in the technical scope of the present disclosure. Furthermore, new technical features can be formed by combining the disclosed technical means. [Explanation of symbols]

[0095] 1. Lighting equipment 8, 8a, 8b Ribs 11 Base material 22 Light source 80, 80A, 80B, 80C, 80D, 80E Optical cover 80a First cover part 80b Second cover part 80c Third cover part U1 Base Unit U2 Light Source Unit

Claims

1. A light source that emits light; a light cover portion that covers the light source; a plurality of ribs arranged on a pair of opposing side surfaces of the optical cover portion; At least one of the plurality of ribs has a first surface on a side closer to the light source and a second surface on a side farther from the light source, The light source unit, wherein the first surface is more inclined than the second surface with respect to a vertical plane perpendicular to an optical axis of the light.

2. The light source unit according to claim 1 , wherein the first surface of each of the plurality of ribs is more inclined with respect to the vertical plane than the second surface.

3. a part of the plurality of ribs is disposed inside the optical cover portion, and another part is disposed outside the optical cover portion; The light source unit according to claim 1 , wherein the rib disposed on the inner side of the light cover is closer to the light source than the rib disposed on the outer side of the light cover.

4. The light source unit according to claim 1 , wherein the first surface at least partially includes a curved portion that curves toward the light source.

5. The light source unit according to claim 1 , wherein the second surface is parallel to the vertical surface.

6. The light source unit according to claim 1 or 2; a base member attached to a mounting body to which the light source unit is detachably attached; A lighting fixture comprising:

Images