Luminaire

Abstract

To provide a luminaire that easily emits uniform and beautiful light with little luminance unevenness.SOLUTION: A luminaire 1 comprises: an adapter attached to an appliance attachment part of a ceiling; a base member stationary with respect to the adapter, and arranged along the ceiling; one or more light emitting elements mounted on a board stationary with respect to the base member; and an inside cover 20 arranged so as to cover the one or more light emitting elements. The inside cover 20 comprises a protruding part 28 protruding to a light incidence side, in a light incidence surface 83 on which light is incident. A tip surface of the protruding part 28 includes a planar part 51 spreading approximately in parallel with the board, or includes a concave part.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to lighting fixtures. [Background technology]

[0002] A conventional lighting fixture is described in Patent Document 1. This lighting fixture includes a substantially circular base plate, a light source, a diffusion cover, and a protective cover. The light source, diffusion cover, and protective cover are held by the base plate. The diffusion cover is disposed between the light source and the protective cover. The diffusion cover is disposed so as to cover the light source, and diffuses light from the light source and distributes it toward the protective cover. The protective cover reflects and diffuses light from the diffusion cover, distributing it to the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-117385 Summary of the Invention [Problem to be solved by the invention]

[0004] The optical cover of a lighting fixture is sometimes formed by injection molding. In this case, traces of one or more gates used to inject resin into a mold for molding the optical cover are left on the optical cover. The present inventors have discovered that, depending on the structure of the traces, light may be locally concentrated, resulting in light with locally high brightness being emitted. Therefore, an object of the present disclosure is to provide a lighting fixture that easily emits uniform, beautiful light with little brightness unevenness. [Means for solving the problem]

[0005] In order to solve the above problems, the lighting fixture of the present disclosure comprises a mounting part that is attached to a fixture mounting part provided on the ceiling of a building, a base member that is stationary relative to the mounting part and is arranged along the ceiling, one or more light-emitting elements mounted on a substrate that is stationary relative to the base plate, and one or more optical covers that are arranged to cover the one or more light-emitting elements, wherein at least one of the optical covers has a protrusion that protrudes toward the light incident side from the light incident surface where light is incident, and the tip surface of the protrusion includes a flat portion that extends approximately parallel to the substrate or includes a concave portion. [Effects of the Invention]

[0006] The lighting fixture according to the present disclosure is likely to emit uniform, beautiful light with little unevenness in brightness. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view of a lighting fixture according to an embodiment of the present disclosure, viewed obliquely from below. FIG. [Figure 2] FIG. 2 is a perspective view of the lighting fixture as viewed obliquely from above. [Figure 3] FIG. 2 is a perspective view of the lighting fixture with the outer cover removed, viewed obliquely from below. [Figure 4] 4 is a perspective view of the lighting fixture shown in FIG. 3 with the inner cover further removed, as viewed obliquely from below. [Figure 5] FIG. [Figure 6] 10 is a perspective view of a fixing point of the receiving device on the base member as viewed from the radially outer side. FIG. [Figure 7] FIG. 2 is a perspective view of the outer cover as viewed obliquely from above. [Figure 8] FIG. 2 is a perspective view of the inner cover as viewed obliquely from below. [Figure 9] FIG. 2 is a perspective view of the inner cover as viewed obliquely from above. [Figure 10] 10 is an enlarged cross-sectional view of the inner cover cut along a curved plane that passes through the central axis of one protrusion and includes the circumferential and height directions, and is an enlarged cross-sectional view of the periphery of the protrusion. FIG. [Figure 11] FIG. 11 is an enlarged cross-sectional view of the inner cover of the reference example, corresponding to FIG. 10. [Figure 12] 10A and 10B are diagrams showing the luminance distribution of light emitted from the periphery of a protrusion on the inner cover of the lighting fixture of the reference example. [Figure 13] 10A and 10B are diagrams illustrating the luminance distribution of light emitted from the periphery of the protrusion on the inner cover of the lighting fixture of the present embodiment. [Figure 14] 11 is an enlarged cross-sectional view of an inner cover of a first modified example, corresponding to FIG. 10. FIG. [Figure 15] 11 is an enlarged cross-sectional view of an inner cover of a second modified example, corresponding to FIG. 10. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, when multiple embodiments or variations are included below, it is anticipated from the beginning that new embodiments can be constructed by appropriately combining their characteristic features. In the following examples, the same components in the drawings are designated by the same reference numerals, and redundant explanations will be omitted. Furthermore, multiple drawings include schematic diagrams, and the dimensional ratios of the length, width, height, etc. of each component between different drawings do not necessarily match. Among the components described below, components not recited in the independent claims representing the highest concepts are optional components and are not essential components.

[0009] In the following description, when terms related to the vertical direction, such as below, above, lower side, and upper side, are used, they refer to the direction when the lighting fixture 1 is installed on a ceiling. Furthermore, when the "height direction" is referred to in the following description, the height direction refers to the height direction of the lighting fixture 1, and when the "orthogonal direction" is referred to, the orthogonal direction refers to a direction perpendicular to the height direction. Furthermore, the lighting fixture 1 of the embodiment has a shape that allows identification of a center and a radial direction in a plan view when viewed from the height direction. More specifically, the outer cover 30 of the embodiment has a dome shape with a through-hole 31 in the center and a circular ring shape in a plan view when viewed from below in the height direction. In the following description, when the "radial direction" is referred to, the radial direction refers to the radial direction of the outer cover 30. When the "inner" is referred to, the inner side refers to the radially inner side. When the "outer" is referred to, the outer side refers to the radially outer side.

[0010] Fig. 1 is a perspective view of a lighting fixture 1 according to an embodiment of the present disclosure as viewed from diagonally below, and Fig. 2 is a perspective view of the lighting fixture 1 as viewed from diagonally above. Fig. 3 is a perspective view of the lighting fixture 1 as viewed from diagonally below with the outer cover 30 removed, and Fig. 4 is a perspective view of the lighting fixture 1 as viewed from diagonally below with the inner cover 20 further removed from the state shown in Fig. 3.

[0011] As shown in Figures 1 to 4, lighting fixture 1 includes an adapter 5 that forms a mounting portion to be attached to a fixture mounting portion (not shown) provided on the ceiling of a building, a base member 10 that is stationary relative to adapter 5 and arranged along the ceiling, a light source (not shown) that is stationary relative to base member 10, an inner cover 20 that is arranged to cover the light source, an outer cover 30 that is arranged to cover inner cover 20, and one or more brackets 40 that support outer cover 30 and are attached to base member 10. In this embodiment, the light source emits light based on power supplied from an external source via adapter 5. However, the light source may also emit light based on power supplied from an external source without via an adapter.

[0012] The base member 10 is made of a metal plate that is, for example, substantially annular in plan view when viewed from the height direction. In the lighting fixture 1, the inner cover 20 is engaged with the adapter 5 so as to be rotatable relative to the adapter 5, preventing the inner cover 20 from falling off the adapter 5. The inner cover 20 and the receiving fixture 40 are fixed to the base member 10 and are integrated with the base member 10. The outer cover 30 is engaged with the receiving fixture 40. The integrated structure of the lighting fixture 1 will be described in detail below.

[0013] As shown in FIG. 1 , the outer cover 30 has a dome shape with a through-hole 31 in the center, and has a circular ring shape in a plan view when viewed from below in the height direction. The outer cover 30 is made of a translucent resin material, such as polycarbonate, acrylic, or silicone. A portion of the human presence sensor 7 is housed within the through-hole 31 of the outer cover 30, and a sensor surface 7a of the human presence sensor 7 is exposed to the outside through the through-hole 31. The human presence sensor 7 is made of, for example, an infrared sensor, and detects the presence of a person by sensing infrared rays emitted from the human body. The fixing structure of the human presence sensor 7 will be described later.

[0014] As shown in FIG. 2, the adapter 5 has two connecting fittings 8. After inserting the two connecting fittings 8 into two fitting insertion holes provided in the fixture mounting portion on the ceiling, the adapter 5 is rotated to secure the adapter 5 to the fixture mounting portion, and the power supply unit and control unit of the lighting fixture 1 are electrically connected to an external power source via wiring within the adapter 5. The power supply unit converts external AC power into DC power and reduces the voltage to an appropriate level. DC power is constantly supplied to the human presence sensor 7. When the control unit receives a signal indicating that the human presence sensor 7 has detected a person, it turns on a switching unit for controlling the light source mounted on the power supply unit. This on control supplies power to the light source, causing the light source to emit light. The switching unit is composed of, for example, a transistor.

[0015] As shown in Fig. 3, the inner cover 20 defines a generally doughnut-shaped internal chamber 29. The inner cover 20 is made of a translucent resin material, such as polycarbonate, acrylic, or silicone. A light source is disposed within the internal chamber 29 of the inner cover 20. The inner cover 20 is a diffusion cover that diffuses light from the light source and distributes it toward the outer cover 30.

[0016] The inner cover 20 has a plate-shaped flange portion 21 on its outer periphery that extends around the entire periphery in the circumferential direction. In this embodiment, the plate-shaped flange portion 21 has a substantially annular shape in a plan view when viewed from the height direction. However, the plate-shaped flange portion may have a substantially rectangular (e.g., substantially square) shape with a hole in the center when viewed from the height direction. The flange portion 21 is provided on the upper outer edge of the inner cover 20 so as to protrude radially outward and extend circumferentially. Providing the annular flange portion 21 on the inner cover 20 can effectively seal the gap between the inner cover 20 and the base member 10, thereby substantially reliably preventing light leakage between the inner cover 20 and the base member 10. Instead of the annular flange portion 21, the inner cover 20 may have multiple plate-shaped flange portions on its outer periphery that are spaced apart in the circumferential direction. In this case, each flange portion is provided on the upper outer edge of the inner cover so as to protrude radially outward. It is preferable that each flange portion extend circumferentially.

[0017] The flange portion 21 has first thin-walled portions 21a and first thick-walled portions 21b that are thicker than the first thin-walled portions 21a, arranged alternately in the circumferential direction. The first thick-walled portions 21b include protrusions that protrude radially outward beyond the first thin-walled portions 21a. The first thick-walled portions 21b have threaded holes. The inner cover 20 is fixed to the base member 10 by fastening the screws 9 into the threaded holes of the first thick-walled portions 21b and then into threaded holes (not shown) in the base member 10. Because the screws 9 are fastened to the first thick-walled portions 21b, which have high rigidity, damage to the flange portion 21 caused by fastening the screws 9 can be effectively suppressed.

[0018] 4, the adapter 5 has a plurality of protrusions 5a at a height intermediate portion thereof, which protrude radially outward from its cylindrical outer circumferential surface and extend circumferentially. The inner cover 20 also has protrusions (not shown) on its inner circumferential surface, which protrude radially inward and extend circumferentially. By engaging the protrusions of the inner cover 20 with the protrusions 5a while positioned above the protrusions 5a, the inner cover 20 is engaged with the adapter 5 in a relatively rotatable state, preventing it from falling off the adapter 5.

[0019] 3, a human presence sensor holding member 70 is fixed to the inner cover 20. The human presence sensor holding member 70 has an annular holding portion 71 that encases and holds the human presence sensor 7, and a pair of pillar portions 72 that are formed integrally with the holding portion 71. When the human presence sensor 7 is held by the holding portion 71, the sensor surface 7a of the human presence sensor 7 protrudes downward beyond the holding portion 71.

[0020] The pair of pillars 72 are arranged on the same straight line across the center of the appliance in a plan view from the height direction. The holding portion 71 is located at the center of the appliance in a plan view from the height direction and is located below the inner cover 20 with a gap in the height direction relative to the inner cover 20. The pillars 72 are inclined with respect to the height direction so as to be displaced radially inward as they extend downward. A flat mounting portion 75 extending along the underside 22 of the inner cover 20 is provided at the end of the pillars 72 facing the inner cover 20. In this embodiment, the underside 22 and the mounting portion 75 extend in a substantially perpendicular direction. The mounting portion 75 is fixed to the inner cover 20 with a rivet 77, thereby fixing the human sensor holding member 70 to the inner cover 20.

[0021] As shown in FIG. 4, the lighting device 1 includes a substrate 80 fixed to a base member 10. The substrate 80 is fixed to the underside of the base member 10 by fixing means such as screws or adhesive. The substrate 80 is provided with a through-hole 82 formed of a cylindrical hole or the like. A plurality of electronic components 81 that constitute a control device and a power supply device are mounted on the substrate 80. A plurality of LED (Light Emitting Diode) chips (not shown) are mounted on the substrate 80.

[0022] The light source is composed of multiple LED chips. The multiple LED chips are arranged radially outward from the adapter 5, for example, radially outward from the multiple electronic components 81. The multiple LEDs may be arranged at intervals in the circumferential direction on the circumference of a circle centered on the center of the fixture in a plan view when viewed from the height direction. Alternatively, the multiple LEDs may be arranged at intervals in the circumferential direction on two or more circles centered on the center of the fixture and having different diameters. The light source may also be composed of a single LED chip.

[0023] Next, the structure for fixing the holder 40 to the base member 10 and the structure for locking the outer cover 30 to the holder 40 will be described. Fig. 5 is a perspective view of the holder 40, and Fig. 6 is a perspective view of the fixing point of the holder 40 on the base member 10 as viewed from the radial outside. The holder 40 is made of resin. As shown in Fig. 6, the holder 40 has an internal chamber 41 that opens radially outward and to one circumferential side.

[0024] The receiver 40 further has a plurality of locking portions 42 that protrude upward and are spaced apart in the circumferential direction, and a cylindrical positioning portion 43 that protrudes upward. The locking portions 42 include a locking claw 42a that extends in the circumferential direction, and a connecting portion 42b that connects the locking claw 42a to a bottom plate 45 of the receiver 40 and extends in the height direction. The locking claw 42a includes a claw portion 42c that protrudes to the other circumferential side.

[0025] The bottom plate 45 of the receiver 40 is provided with a thin, flexible portion 46 with through holes around its periphery. The positioning portion 43 protrudes upward from the flexible portion 46. As shown in FIG. 6 , the base member 10 has a first through hole 10a through which the locking claw 42a can pass and a second through hole 10b formed as a cylindrical hole. The height of the first through hole 10a is approximately the same as the height of the connecting portion 42b. After the locking claw 42a passes through the first through hole 10a from below, the receiver 40 is moved relative to the base member 10 in one circumferential direction while the flexible portion 46 is elastically deformed upward. This causes the positioning portion 43 to fit into the second through hole 10b. In this state, the elastic deformation of the flexible portion 46 is released, and the connecting portion 42b is sandwiched between a pair of substantially parallel opposing surfaces on the inner circumferential surface of the first through hole 10a, and the claw portion 42c is engaged with the upper surface of the base member 10. The receiver 40 is attached to the base member 10 in such a structure and positioned relative to the base member 10 .

[0026] As shown in Fig. 5, the radially inner surface of the internal chamber 41 of the receiver 40 has a substantially V-shaped recess 47 in the circumferential center and a locking portion 48 that protrudes radially outward. On the other hand, as shown in Fig. 7, i.e., a perspective view of the outer cover 30 viewed obliquely from above, the outer cover 30 has a protrusion 33 at the upper end of its inner circumferential surface that has a shape corresponding to the recess 47 and protrudes radially inward.

[0027] The multiple brackets 40 are fixed to the base member 10 at intervals in the circumferential direction. In order to stably and reliably support the outer cover 30 with the brackets 40, the multiple brackets 40 are preferably arranged at approximately equal intervals in the circumferential direction, and it is preferable that the lighting fixture 1 includes three or more brackets 40 arranged at intervals in the circumferential direction. There are the same number of protrusions 33 as the number of brackets 40.

[0028] With the circumferential positions of the protrusions 33 different from the circumferential positions of the holders 40, the outer cover 30 is brought into contact with the underside of the base member 10 so as to cover the multiple holders 40. When the outer cover 30 is then rotated relative to the base member 10 in one circumferential direction, the outer cover 30 elastically deforms radially outward, causing the tapered tips of the protrusions 33 to climb over one circumferential end of the locking portions 48 and fit into the recesses 47. With this fit, the protrusions 33 are locked in the locking portions 48, and the outer cover 30 is fixed to the multiple holders 40.

[0029] Next, the structure of the inner cover 20 and the associated effects that the lighting device 1 can achieve will be described. Fig. 8 is a perspective view of the inner cover 20 as viewed obliquely from below, and Fig. 9 is a perspective view of the inner cover 20 as viewed obliquely from above. As shown in Fig. 8, the inner cover 20 has a plurality of recesses 25 arranged at intervals on a light exit surface (lower surface) 79 from which light is emitted. Also, as shown in Fig. 9, the inner cover 20 has protrusions 28 arranged at intervals on a light entrance surface (upper surface) 83 from which light is incident and protruding toward the light entrance side. In this embodiment, the recesses 25 are cylindrical holes with a bottom, and the protrusions 28 have the shape of a body of revolution having a central axis.

[0030] The inner cover 20 is formed by injection molding. As a result, the surface of the inner cover 20 bears the marks of one or more gates used to inject resin into a mold (not shown) for molding the inner cover. The multiple protrusions 28 are the marks of the multiple gates. In this embodiment, the inner cover 20 has the marks of multiple pins (not shown) that are inserted into the holes in the mold after the resin is filled. The marks correspond to the multiple recesses 25.

[0031] Fig. 10 is an enlarged cross-sectional view of the inner cover 20 when cut along a curved plane that passes through the central axis of one protrusion 28 and includes the circumferential and height directions, and is an enlarged cross-sectional view of the periphery of the protrusion 28. Fig. 11 is an enlarged cross-sectional view corresponding to Fig. 10 of an inner cover 320 of a reference example. As shown in Fig. 10, in the lighting device 1, the tip surface of the protrusion 28 includes a flat portion 51 that extends substantially parallel to the substrate 80 (see Fig. 4). The protrusion 28 also includes a tapered outer peripheral surface portion 52 whose diameter decreases toward the tip. All of the recesses 25 described above overlap the flat portion 51 in the height direction.

[0032] 11, an optical cover formed by injection molding, for example, inner cover 320, has a smooth convex surface 355 made of a spherical surface or the like on light incident surface 383 corresponding to the gate. This corresponds to providing a smooth concave surface made of a spherical surface or the like on the part of the mold facing the gate in order to improve the fluidity of the resin.

[0033] However, the inventors of the present invention have discovered that if such a convex surface 355 is provided on the inner cover 320, the light is concentrated by the convex surface 355, and as shown in Figure 12, light with extremely high brightness is emitted from the light emitting surface 379 locally on the extension of the axis of the protrusion 328, making it difficult to emit beautiful, uniform light with little brightness unevenness from the lighting fixture.

[0034] In contrast, as shown in FIG. 10 , if the tip surface of the protrusion 28 includes a flat portion 51 extending substantially parallel to the substrate 80 (see FIG. 4 ), light incident on the inner cover 20 will not be concentrated at the tip surface of the protrusion 28. Therefore, as shown in FIG. 13 , it is possible to effectively prevent light with locally high brightness from being emitted from the light-emitting surface portion facing the protrusion 28 in the height direction. This makes it easier for the lighting device 1 to emit uniform, beautiful light with little unevenness in brightness. In order to prevent light incident on the inner cover 20 from being concentrated at the tip surface of the protrusion 28, it is preferable that the entire tip surface of the protrusion 28 be composed of the flat portion 51.

[0035] Furthermore, if the protrusion 28 includes a tapered outer peripheral surface portion 52 whose diameter decreases toward the tip, the flowability of the resin during molding of the inner cover 20 can be improved, making it possible to produce an inner cover 20 with high dimensional accuracy. Also, the inner cover 20 can be easily released from the mold.

[0036] Furthermore, when recesses 25 are provided on the light exit surface 79, if all of the recesses 25 are arranged to overlap the flat surface portion 51 in the height direction, thin portions are less likely to occur in the inner cover 20, and the rigidity of the inner cover 20 can be increased. Therefore, breakage of the inner cover 20 can be suppressed.

[0037] The present disclosure is not limited to the above-described embodiment and its modifications, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents. For example, in the above-described embodiment, the protrusion 28 includes a tapered outer peripheral surface portion 52 whose diameter decreases toward the tip. However, as shown in FIG. 14, i.e., an enlarged cross-sectional view of an inner cover 120 of a first modification corresponding to FIG. 10, the tip surface of the protrusion 128 may include a flat portion 151 extending substantially parallel to the substrate 80, or the protrusion 128 may include a cylindrical outer peripheral surface portion 152.

[0038] Furthermore, as shown in FIG. 15, an enlarged cross-sectional view corresponding to FIG. 10 of the inner cover 220 of the second modified example, the tip surface of the protrusion 228 may include a smooth concave portion 251, such as a spherical surface. The concave surface has the property of diffusing incident light. Therefore, according to the second modified example, it is possible to further reduce the unevenness in brightness of the light emitted from the light-emitting surface portion facing the concave portion 251 in the height direction. This further reduces the unevenness in brightness of the light emitted from the lighting device 201, allowing the lighting device 201 to emit uniform, beautiful light.

[0039] The above description deals with a case where recess 25 is provided on the light exit surface portion that faces protrusion 28 in the height direction. However, a recess need not be provided on the light exit surface portion that faces protrusion 28 in the height direction. The above description also deals with a case where lighting device 1 includes two optical covers, i.e., inner cover 20 and outer cover 30. Here, in addition to inner cover 20 or instead of inner cover 20, outer cover 30 may have a protrusion that protrudes toward the light incident side on the light incident surface where light is incident, and the tip surface of the protrusion may include a flat portion that extends approximately parallel to substrate 80 or may include a concave portion.

[0040] Alternatively, the lighting device may include one or three or more optical covers, and at least one of the optical covers may have a protrusion that protrudes toward the light incident side from the light incident surface into which light is incident, and the tip surface of the protrusion may include a flat portion that extends approximately parallel to the substrate, or may include a concave portion.

[0041] In addition, the light source has been described as being composed of multiple LED chips. However, the light source may include one or more chips of light-emitting elements other than LED chips, or may include one or more chips of solid-state light-emitting elements such as semiconductor laser chips, organic EL (Electro Luminescence) chips, inorganic EL chips, etc.

[0042] Furthermore, the lighting device of the present disclosure may have the following configuration. Configuration 1: A lighting fixture comprising: a mounting part that is attached to a fixture mounting part provided on the ceiling of a building; a base member that is stationary relative to the mounting part and arranged along the ceiling; one or more light-emitting elements mounted on a substrate that is stationary relative to the base plate; and one or more optical covers that are arranged to cover the one or more light-emitting elements, wherein at least one of the optical covers has a protrusion that protrudes toward the light incident side from the light incident surface where light is incident, and the tip surface of the protrusion includes a flat portion that extends approximately parallel to the substrate or includes a concave portion. Configuration 2: The lighting device according to configuration 1, wherein the protrusion includes a tapered outer peripheral surface portion that becomes smaller in diameter toward the tip. Configuration 3: The lighting fixture of configuration 1, wherein the protrusion includes a cylindrical outer periphery surface portion. Configuration 4: A lighting device according to any one of configurations 1 to 3, wherein the protrusion has the flat portion, and the at least one optical cover has recesses on the light exit surface from which light exits, and all of the recesses overlap the flat portion in the height direction. Configuration 5: The lighting device described in any one of configurations 1 to 4, wherein the one or more optical covers include an inner cover arranged to cover the one or more light-emitting elements and an outer cover arranged to cover the inner cover, the inner cover being a diffusion cover that diffuses light from the one or more light-emitting elements, and the inner cover having the protrusion. [Explanation of symbols]

[0043] 1,201 Lighting fixture, 5 Adapter, 5a Protrusion, 7 Human presence sensor, 7a Sensor surface, 8 Connecting fitting, 9 Screw, 9a Head, 10 Base member, 10a First through hole, 10b Second through hole, 20, 120, 220 Inner cover, 21 Flange portion, 21a First thin portion, 21b First thick portion, 22 Underside, 25 Recess, 28, 128, 228 Protrusion, 30 Outer cover, 31 Through hole, 33 Protrusion, 40 Receiver, 41 Internal chamber, 42 Locking portion, 42a Locking claw, 42b Connecting portion, 42c Claw portion, 43 Positioning portion, 45 Bottom plate, 46 Flexible portion, 47 Recess, 48 Engagement portion of receiving device, 51,151 flat portion, 52 tapered outer peripheral surface portion, 70 human sensor holding member, 71 holding portion, 72 column portion, 75 mounting portion, 77 rivet, 80 board, 81 electronic component, 79 light exit surface, 83 light entrance surface, 85 through hole of board, 152 cylindrical outer peripheral surface portion, 251 concave portion.

Claims

1. a mounting portion that is attached to a fixture mounting portion provided on the ceiling of a building; a base member that is stationary relative to the mounting portion and is disposed along the ceiling; one or more light emitting elements mounted on a substrate that is stationary relative to the base member; one or more optical covers disposed to cover the one or more light emitting elements, At least one of the optical covers has a protrusion that protrudes toward the light incident side on a light incident surface on which light is incident, A lighting device, wherein a tip surface of the protrusion includes a flat portion extending substantially parallel to the substrate, or includes a concave portion.

2. The lighting fixture according to claim 1 , wherein the protrusion includes a tapered outer circumferential surface portion that becomes smaller in diameter toward a tip.

3. The lighting fixture of claim 1 , wherein the protrusion comprises a cylindrical outer periphery.

4. the protrusion has the flat portion, the at least one optical cover has a recess on a light exit surface from which light exits, The lighting fixture according to claim 1 , wherein all of the recesses overlap the flat portion in the height direction.

5. the one or more optical covers include an inner cover disposed to cover the one or more light-emitting elements, and an outer cover disposed to cover the inner cover, the inner cover is a diffusion cover that diffuses light from the one or more light-emitting elements, The lighting fixture according to claim 1 , wherein the inner cover has the protrusion.

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