Lighting fixture

Abstract

To propose a lighting fixture having improved strength against vibration while suppressing unnecessary increase in mass.SOLUTION: In a lighting fixture 1 having a light source unit 100 and an arm 200 attached to a mounted surface, the arm 200 is arranged between the mounted surface and the light source unit 100, is arranged on both sides of the light source unit 100 in a second direction X, extends from edge parts 21eb, 21ef on both sides of the side surface part 21 in a third direction Y to the side opposite the light source unit 100 in the second direction X, and has a pair of connection surface parts 30B, 30F connecting the edge parts 21eb, 21ef to the edge parts on both sides of the base flat part 11 in the third direction Y.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a lighting fixture that includes an arm and is attached to a mounting surface such as a ceiling. [Background technology]

[0002] Lighting fixtures must take into consideration the effects of earthquakes and vibrations from surrounding facilities. If the fixture's natural frequency matches the external vibration frequency, a resonance phenomenon will occur, placing a large load on the fixture body and leading to damage to the parts. As a countermeasure, a structure can be considered in which the strength of the parts themselves is increased to withstand the resonance load, or the natural frequency is increased by increasing the rigidity of the fixture, thereby avoiding resonance itself. The most easily conceivable countermeasure is to increase the plate thickness of the arm used to attach the fixture to the construction material, which is the most dominant factor in the strength of the fixture. However, increasing the plate thickness of the arm also increases the plate thickness in places that are not related to the strength, leading to an unnecessary increase in mass. Therefore, there is a design that ensures rigidity by changing the shape of the arm without increasing the plate thickness (see Patent Document 1, for example).

[0003] In the lighting device of Patent Document 1, the arm has an arm main portion formed to extend in the width direction, and an arm support portion formed to extend in the up-down direction from the arm main portion. The arm main portion has an arm horizontal portion formed in a rectangular shape long in the width direction, and a main portion flange portion protruding downward from each of the depth-direction sides of the arm horizontal portion. The arm support portion has, in order from the top, an arm bent portion protruding downward in an arc shape from one end of the arm horizontal portion in the width direction, an arm vertical portion extending downward, and an arm connection portion. At the end of the arm bent portion on the side of the arm horizontal portion, a mounting opening into which a claw of a mounting bracket is inserted is provided so as to penetrate the plate material. The arm support portion has a support portion flange portion provided to protrude in the width direction from the depth-direction sides of the arm bent portion and the arm vertical portion, and the support portion flange portion is provided continuously with the main portion flange portion. Patent Document 1 discloses that the support flange portion of the arm support part in the arm is arranged to be continuous with the main flange portion of the arm main part, thereby reinforcing the loss of rigidity caused by providing an attachment opening at the arm bending part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-157954 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the lighting fixture of Patent Document 1, the support flange of the arm support is provided continuously with the main flange protruding downward from each side of the arm horizontal part in the depth direction, and is provided to protrude toward the light source unit in the width direction. Therefore, the arm connection part provided on the lower side of the arm vertical part does not have a flange part to avoid interference with surrounding members, and the cross section of the arm connection part is I-shaped. Therefore, the lighting fixture of Patent Document 1 suppresses unnecessary increase in mass compared to a lighting fixture with a thicker arm plate, but the rigidity is locally reduced in the vertical surfaces of the arm vertical part and the arm connection part, and sufficient strength against vibration cannot be ensured.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to propose a lighting fixture that has improved strength against vibration while suppressing unnecessary increases in mass. [Means for solving the problem]

[0007] A lighting device according to the present disclosure includes a light source unit and an arm for mounting the light source unit to a mounting surface, the arm being disposed between the mounting surface and the light source unit when the light source unit is mounted to the mounting surface, the arm being disposed on both sides of the light source unit in a second direction perpendicular to a base flat portion facing the mounting surface when a first direction is a direction in which the mounting surface and the base flat portion face each other, and a first side portion and a second side portion fixed to the light source unit, the arm being disposed on both sides of the light source unit in a second direction perpendicular to the first direction when a third direction is a direction perpendicular to the first direction and the second direction is a direction perpendicular to the first direction and the second direction, the arm being disposed on both sides of the first side portion in the third direction perpendicular to the first direction and the second direction. the pair of first connecting surface portions extending from the edges of the second side portion on both sides in the third direction to the side opposite the light source unit in the second direction and connecting the edges of the first side portion on both sides in the third direction to the edges of the base flat portion on both sides in the third direction, the pair of first connecting surface portions being provided from one end in the first direction to the other end of the edges of the second side portion on both sides in the third direction, and the pair of second connecting surface portions being provided from one end in the first direction to the other end of the edges of the second side portion on both sides in the third direction. Effect of the Invention

[0008] In the lighting device according to the present disclosure, the pair of first connection surface portions extend from the first side portion to the side opposite the light source unit, and therefore can be provided from one end to the other end of the edge of the first side portion in the first direction. Also, the pair of second connection surface portions extend from the second side portion to the side opposite the light source unit, and therefore can be provided from one end to the other end of the edge of the second side portion in the first direction. As a result, the cross-sectional shape of the first side portion of the arm and the cross-sectional shape of the second side portion of the arm are made into a U-shape with an angle that is more rigid than an I-shape by the side portion and the pair of connection surface portions, and this cross-sectional shape is maintained from one end to the other end of the side portion in the first direction. Therefore, it is possible to suppress a local decrease in rigidity in the side portion of the arm without increasing the plate thickness of the arm, and as a result, it is possible to provide a lighting device that has improved strength against vibration while suppressing an unnecessary increase in mass. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of the lighting fixture according to the first embodiment as viewed from the upper right front. [Diagram 2] 2 is a perspective view of the lighting fixture of FIG. 1 as viewed from the lower right front. [Diagram 3] 3 is an exploded perspective view showing a state in which the lower part of the lighting fixture in FIG. 2 is disassembled. FIG. [Figure 4] FIG. 2 is a plan view of the lighting fixture of FIG. [Diagram 5] 5 is a cross-sectional view of the lighting fixture of FIG. 4 along the line AA. [Figure 6] FIG. 2 is an exploded perspective view of the DC power supply device of FIG. [Figure 7] FIG. 2 is an exploded perspective view of the arm of FIG. 1. [Figure 8] FIG. 11 is a perspective view of the lighting fixture according to the second embodiment, as viewed from the front upper right. [Figure 9] FIG. 9 is an exploded perspective view of the arm of FIG. 8. [Figure 10] FIG. 11 is a perspective view of a top side arm of a lighting fixture in accordance with the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the following embodiment, an example of a lighting fixture according to the present disclosure will be described. In the following embodiment, the lighting fixture is defined as being attached to the underside of a mounting surface 1000 such as an exposure box, and the configuration of the lighting fixture will be described. In each drawing, the up-down direction of the lighting fixture is indicated by the arrow Z direction, the horizontal direction perpendicular to the up-down direction is indicated by the arrow X direction, and the depth direction perpendicular to the up-down direction and the horizontal direction is indicated by the arrow Y direction. Note that these directions do not limit the lighting fixture according to the present disclosure.

[0011] Embodiment 1 Fig. 1 is a perspective view of a lighting fixture 1 according to the first embodiment, as viewed from the front upper right. Fig. 2 is a perspective view of the lighting fixture 1 of Fig. 1, as viewed from the front lower right. Fig. 3 is an exploded perspective view showing a state in which the lower part of the lighting fixture 1 of Fig. 2 has been disassembled. Fig. 4 is a plan view of the lighting fixture of Fig. 1. Fig. 5 is a cross-sectional view of the lighting fixture 1 of Fig. 4, taken along line AA. Fig. 6 is an exploded perspective view of a DC power supply device 90 of Fig. 1.

[0012] The lighting fixture 1 includes a light source unit 100 having a light source 60, and an arm 200 that is attached to a mounting surface 1000 and holds the light source unit 100. The lighting fixture 1 is attached to the mounting surface 1000 by fixing the arm 200 to the mounting surface 1000 with a fastener (not shown) such as a bolt. The light source 60 does not have to be a component of the lighting fixture 1, but in the first embodiment, the light source 60 constitutes the light source unit 100 as a component of the lighting fixture 1. The lighting fixture 1 also includes a connection member 41 such as a bolt that fixes the light source unit 100 to the arm 200.

[0013] 1, the light source unit 100 is attached to the arm 200 by a connecting member 41. The arm 200 is disposed between the mounting surface 1000 and the light source unit 100, and has a flat base plane portion 11 facing the mounting surface 1000, and two flat side portions 21, 21 disposed on either side of the light source unit 100 in the lateral direction (arrow X direction) and fixed to the light source unit 100.

[0014] As shown in Fig. 5, the side surface portion 21 of the arm 200 is provided with a fixing hole 21h (see Fig. 7 described later) into which a connecting member 41 for fixing the light source unit 100 to the arm 200 is inserted. The side surfaces 101 and 102 on both lateral sides of the light source unit 100 are formed with female screws (not shown) into which the connecting member 41 inserted into the fixing hole 21h of the side surface portion 21 of the arm 200 is screwed, and the light source unit 100 is attached to the arm 200 by fixing the side surface portion 21 to each of the side surfaces 101 and 102 on both sides of the light source unit 100 with the connecting member 41. As shown in Fig. 1, the two side surface portions 21 are provided below the base flat surface portion 11. The side surface portion 21 is, for example, rectangular in side view.

[0015] As shown in Fig. 4, the base planar portion 11 of the arm 200 is formed with a mounting hole 11h into which a fastener for fixing the arm 200 to a mounting surface 1000 is inserted. The mounting surface 1000 is formed with a female thread into which the fastener inserted into the mounting hole 11h of the base planar portion 11 is screwed, and the arm 200 is attached to the mounting surface 1000 by fixing the base planar portion 11 to the mounting surface 1000 with the fastener. The base planar portion 11 has, for example, a rectangular shape with long sides extending in the horizontal direction (arrow X direction) in a plan view as shown in Fig. 4. In Fig. 4, the mounting holes 11h are provided at both ends of the base planar portion 11 in the horizontal direction.

[0016] 1, the arm 200 has a pair of connection surface portions 30 extending in the lateral direction (arrow X direction) from edge portions 21ef, 21eb on both sides in the depth direction (arrow Y direction) of the side surface portion 21 to the side opposite the light source unit 100. The pair of connection surface portions 30 connect the edge portions 21ef, 21eb on both sides in the depth direction of the side surface portion 21 to edge portions 11ef, 11eb on both sides in the depth direction of the base flat portion 11.

[0017] The pair of connection surface portions 30 reinforce the side surface portion 21 and the base flat surface portion 11. In the portion of the arm 200 where the pair of connection surface portions 30 are provided, the cross-sectional shape of the arm 200 is a downward U-shape with an angle formed by the base flat surface portion 11 and the pair of connection surface portions 30, thereby improving rigidity. Also, in the arm 200, the cross-sectional shape of the side surface portion 21 is a horizontal U-shape with an angle formed by the side surface portion 21 and the pair of connection surface portions 30, thereby improving rigidity.

[0018] The front connection surface 30F of the pair of connection surfaces 30 is provided to the lower end at the front edge 21ef of the side surface 21, and the rear connection surface 30B of the pair of connection surfaces 30 is provided to the lower end at the rear edge 21eb of the side surface 21. In FIG. 1, the outer edge 30eo on the side opposite to the light source unit 100 of each of the connection surfaces 30F and 30B is inclined with respect to the inner edge 30ei on the side of the side surface 21 (the front edge 21ef of the side surface 21, or the rear edge 21eb of the side surface 21). In detail, the outer edge 30eo of each of the connection surfaces 30F, 30B is inclined with respect to the inner edge 30ei so that the width W of the connection surfaces 30F, 30B in the lateral direction (arrow X direction) becomes smaller as it goes downward, i.e., as it goes away from the base flat surface portion 11. The shape of each of the connection surfaces 30F, 30B is not limited to the above-mentioned shape, and may be, for example, a rectangular shape with a width W that is constant in the vertical direction (arrow Z direction).

[0019] In arm 200, the direction in which two side surface portions 21 face each other is defined as a second direction, the direction perpendicular to the second direction in which base flat portion 11 faces mounting surface 1000 is defined as a first direction, and the direction perpendicular to the first and second directions is defined as a third direction. In the first embodiment, the first, second, and third directions of arm 200 are the up-down direction (arrow Z direction), lateral direction (arrow X direction), and depth direction (arrow Y direction) of lighting fixture 1, respectively.

[0020] Hereinafter, of the two side surface portions 21, 21 of the arm 200, the side surface portion 21 fixed to the left side surface 101 of the light source unit 100 may be referred to as the first side surface portion 21L, and the side surface portion 21 fixed to the right side surface 102 of the light source unit 100 may be referred to as the second side surface portion 21R. A pair of connection surface portions 30 is provided for each side surface portion 21. Hereinafter, the pair of connection surface portions 30 provided on the first side surface portion 21L may be referred to as the pair of first connection surface portions 30L, and the pair of connection surface portions 30 provided on the second side surface portion 21R may be referred to as the pair of second connection surface portions 30R. The detailed structure of the arm 200 will be described later.

[0021] As shown in FIG. 3, the light source unit 100 includes a light source 60, a cover 50 that covers the light source 60, and a heat sink 70 to which the light source 60 is attached and which dissipates heat from the light source 60.

[0022] The lighting fixture 1 also includes a DC power supply device 90 that is a power source for the light source unit 100, and a power supply mounting bracket 80 for mounting the DC power supply device 90 to the light source unit 100.

[0023] In the light source unit 100, the light source 60 and the cover 50 are arranged in this order from top to bottom below the heat sink 70, and the light source 60 and the cover 50 are attached to the underside of the heat sink 70 by a cover fastener 43 such as a screw. In the light source unit 100, a DC power supply device 90 is arranged above the heat sink 70, and the DC power supply device 90 is attached to the heat sink 70 by a power supply mounting bracket 80. The heat sink 70 is fixed to the arm 200 by a connecting member 41, thereby mounting the light source unit 100 to the arm 200.

[0024] The devices constituting the lighting fixture 1 or the light source unit 100 and the arrangement of these devices, as well as the device to which the arm 200 is fixed in the light source unit 100, are not limited to those described above. For example, the DC power supply device 90 does not have to be a component of the lighting fixture 1, and the lighting fixture 1 may be configured to obtain power from an external power source.

[0025] The configuration of each device constituting the light source unit 100 will be described below. As shown in FIG. 3, in the first embodiment, the light source 60 is a light-emitting substrate using the light-emitting element 62. The light source 60 includes a substrate 61 and a plurality of light-emitting elements 62 mounted on the substrate 61. The light source 60 is electrically connected to the DC power supply device 90 through wiring, and the light-emitting element 62 is caused to emit light by the power from the DC power supply device 90. In FIG. 3, the substrate 61 has a substantially circular shape, and the plurality of light-emitting elements 62 are arranged in a circular shape (including the inside of the circle) on the substrate 61. Note that the shape of the substrate 61 and the arrangement of the plurality of light-emitting elements 62 are not limited to the above-mentioned circular shape, and may be, for example, a rectangular shape.

[0026] The cover 50 includes a lens portion 51 and a cover flange portion 52. The lens portion 51 covers the light source 60 from below, and is formed of, for example, a material having diffusivity. The lens portion 51 controls the irradiation angle of the light emitted from the light emitting element 62. The lens portion 51 is molded of, for example, a resin such as PC (polycarbonate resin) or PMMA (acrylic resin). The cover flange portion 52 is provided on the outer periphery of the lens portion 51, and is fixed to the lower surface of the heat sink 70. For this purpose, a plurality of flange holes 52h are formed in the cover flange portion 52, and the cover fasteners 43 are inserted into each of the flange holes 52h. In Figs. 1 to 3, the cover 50 has a rectangular shape, and the heat sink 70 has a substantially rectangular parallelepiped shape.

[0027] 1 and 5, the heat sink 70 includes a base 71 and a plurality of fins 72, and dissipates heat generated from the light source 60. The base 71 is, for example, a rectangular plate-like member, and constitutes the lower surface of the heat sink 70. As shown in Fig. 3, the base 71 is provided with a plurality of holes 71h1 for mounting the substrate 61 of the light source 60, and a plurality of holes 71h2 for mounting the cover flange portion 52. The base 71 has a thickness that allows screws (for example, the cover fastener 43) to be fixed.

[0028] 1 and 5, the multiple fins 72 are provided on the upper surface of the base 71. In the present embodiment 1, the base 71 and the multiple fins 72 are integrally formed by extrusion molding of aluminum. The method of forming the heat sink 70 is not limited to the above-mentioned extrusion molding, and for example, the base 71 and the multiple fins 72 may be integrally formed by pressing an aluminum plate-like member. Alternatively, the heat sink 70 may be formed by joining the multiple fins 72, each of which is also made of an aluminum plate-like member, to the base 71 made of an aluminum plate-like member.

[0029] The fins 72 increase the heat dissipation area of ​​the heat sink 70 to promote heat dissipation. In FIG. 1, the fins 72 each having a rectangular shape with a long side extending in the depth direction (arrow Y direction) in a side view are arranged in a horizontal direction (arrow X direction), and a gap is formed between adjacent fins 72. As shown in FIG. 5, among the fins 72 arranged in the horizontal direction (arrow X direction), the leftmost fin 72 (hereinafter also referred to as fin 72L) constitutes the left side surface of the heat sink 70, i.e., the left side surface 101 of the light source unit 100, and the rightmost fin 72 (hereinafter also referred to as fin 72R) constitutes the right side surface of the heat sink 70, i.e., the right side surface 102 of the light source unit 100. That is, the female thread (not shown) into which the connection member 41 is screwed in the light source unit 100 is formed in each of the fins 72L and 72R. The first side portion 21L on the left side of the arm 200 is fixed to the fin 72L (i.e., side surface 101) by a connecting member 41, and the second side portion 21R on the right side of the arm 200 is fixed to the fin 72R (i.e., side surface 102) by a connecting member 41.

[0030] Also, as shown in FIG. 1, the fins 72L and 72R, which are the side surfaces on both lateral sides of the heat sink 70, each have a fixing hole (not shown) into which a fastener 44, such as a screw, is inserted for attaching the power supply mounting bracket 80.

[0031] As shown in Fig. 4, the power supply mounting bracket 80 is provided on each of the front and rear edges of the heat sink 70. As shown in Fig. 1 and Fig. 4, in each of the fins 72L and 72R, the side surface portion 21 of the arm 200 is attached to the center in the depth direction (arrow Y direction), and the power supply mounting bracket 80 is fixed in front of and behind the center where the side surface portion 21 is attached.

[0032] 1, the power supply mounting bracket 80 includes a bracket flat portion 81 disposed on the upper surface of the heat sink 70, bracket side portions 82 that protrude downward, i.e., toward the base 71, from both lateral ends of the bracket flat portion 81 and face the fins 72L and 72R, and a bracket reinforcing portion 83 that protrudes downward, i.e., toward the base 71, from one end in the depth direction of the bracket flat portion 81. In the power supply mounting bracket 80 provided on the front edge portion of the heat sink 70, the bracket reinforcing portion 83 protrudes downward from the front end of the heat sink 70 and faces the front ends of the multiple fins 72. In the power supply mounting bracket 80 provided on the rear edge portion of the heat sink 70, the bracket reinforcing portion 83 protrudes downward from the rear end of the heat sink 70 and faces the rear ends of the multiple fins 72.

[0033] A DC power supply unit 90 is attached to the metal fitting flat portion 81. Metal fitting side portions 82 on both lateral sides of the metal fitting flat portion 81 are fixed to the fins 72L, 72R of the heat sink 70 by fasteners 44, respectively. In this way, the power supply mounting metal fitting 80 is attached to the heat sink 70. By providing the metal fitting reinforcing portion 83, the cross section of the power supply mounting metal fitting 80 perpendicular to the lateral direction (direction of arrow X) has an L-shape formed by the metal fitting flat portion 81 and the metal fitting reinforcing portion 83, improving rigidity. In other words, the metal fitting reinforcing portion 83 suppresses deformation of the metal fitting flat portion 81.

[0034] Furthermore, the power supply mounting bracket 80 protects the portion of the heat sink 70 exposed to the front or rear from the arm 200. Specifically, the front and rear ends of the multiple fins 72 are prevented from coming into contact with objects around the lighting fixture 1 and becoming deformed. The power supply mounting bracket 80 also prevents dust from adhering to the heat sink 70. Furthermore, the power supply mounting bracket 80 has bracket side sections 82 on both lateral sides of the bracket flat section 81 fixed to the fins 72L, 72R to which the arm 200 is attached in the heat sink 70, thereby also contributing to reinforcing the fins 72L, 72R (i.e., the side sections 101, 102 of the light source unit 100).

[0035] As shown in Fig. 1, the DC power supply device 90 is disposed between the light source unit 100 and the base flat portion 11 of the arm 200. As shown in Fig. 6, the DC power supply device 90 passes an output wire 95 and causes the light source 60 (see Fig. 3) to emit light at an appropriate output via a power supply board 91.

[0036] As shown in FIG. 6, a DC power supply device 90 includes a power supply case 92, a power supply board 91 housed inside the power supply case 92, a side gasket 93, a power supply end plate 94, an output wire 95 provided on the power supply end plate 94, and a wiring case 96.

[0037] The power supply board 91 converts AC to DC and emits light from the light source 60 (see FIG. 3) through wiring. A case bottom 91c made of aluminum or the like with good heat dissipation properties and processed so that it can be fixed to the power supply case 92 is fixed to the power supply board 91. The power supply case 92 is formed by extrusion molding of aluminum into a cylindrical shape with both ends in the depth direction (arrow Y direction) open. An insertion hole (not shown) for fixing the power supply board 91 is provided at the bottom of the power supply case 92.

[0038] The side packings 93 provide waterproofing to the openings on both sides in the depth direction of the power supply case 92. The power supply end plates 94 are attached to both sides in the depth direction of the power supply case 92, and close the openings together with the side packings 93. An extension portion 94b is provided at the lower end of the power supply end plate 94, extending to the side opposite the power supply case 92 in the depth direction (arrow Y direction). A fixing hole 94bh is formed in the extension portion 94b, into which a fixing device such as a screw (not shown) is inserted. The extension portion 94b of the power supply end plate 94 is fixed to the metal surface portion 81 (see FIG. 1) of the power supply mounting bracket 80 by the fixing device, so that the DC power supply device 90 is fixed to the power supply mounting bracket 80 and attached to the light source unit 100 via the power supply mounting bracket 80.

[0039] The lead wire 95 is an electric wire that supplies power from a power supply source to the light source 60. One end of the lead wire 95 is connected to the light source 60, and the other end of the lead wire 95 is connected to a power line, which is equipment wiring that is routed from the power supply source to the mounting surface 1000. The wiring case 96 hides the wiring that connects from the DC power supply device 90 to the light source 60.

[0040] Fig. 7 is an exploded perspective view of the arm 200 of Fig. 1. Hereinafter, the configuration of the arm 200 of the first embodiment will be described in detail based on Fig. 7 and with reference to Fig. 1.

[0041] As described with reference to FIG. 1, the arm 200 has a base planar portion 11, a first side surface portion 21L, a second side surface portion 21R, a pair of first connection surface portions 30L, and a pair of second connection surface portions 30R. The base planar portion 11 is a horizontal surface extending laterally and is disposed above the light source unit 100. The first side surface portion 21L and the second side surface portion 21R each extend in the up-down direction and are fixed to side surfaces 101, 102 on both lateral sides of the light source unit 100. The pair of first connection surface portions 30L extend leftward from a front edge portion 21ef and a rear edge portion 21eb of the first side surface portion 21L and connect the first side surface portion 21L and the left end portion of the base planar portion 11. The pair of second connection surface portions 30R extend rightward from a front edge 21ef and a rear edge 21eb of the second side surface portion 21R, and connect the second side surface portion 21R and the right end portion of the base flat portion 11.

[0042] In Fig. 7, mounting holes 11h are formed in two locations, one at the left end and one at the right end, in the base flat surface portion 11. Also, in Fig. 7, each mounting hole 11h is an elongated hole that is long in the horizontal direction (the direction of the arrow X). Also, in addition to the mounting holes 11h into which fasteners are inserted, rectangular corner holes 11sh larger than the mounting holes 11h are formed in the base flat surface portion 11 in order to reduce weight.

[0043] The square hole 11sh is provided in a portion of the base flat portion 11 that is not affected by external forces, and is formed, for example, by punching. Since strength is particularly required at the left end portion of the base flat portion 11 where the pair of first connection surface portions 30L are connected and at the right end portion where the pair of second connection surface portions 30R are connected, the square hole 11sh is preferably provided between the left end portion and the right end portion. In Fig. 7, the square holes 11sh are respectively formed in the base flat portion 11 between the lateral center and the left mounting hole 11h, and between the lateral center and the right mounting hole 11h.

[0044] The number of the square holes 11sh does not have to be two, and may be one, or three or more. However, it is preferable that the square holes 11sh are divided into a plurality of parts in the horizontal direction (arrow X direction) and that the connecting parts 11c are left between the square holes 11sh and between the square holes 11sh and the mounting holes 11h. This is because if the opening width Wsh per square hole 11sh is large, the portion of the upper part of the arm 200 that has a U-shaped cross section with corners decreases, and the rigidity of the base planar part 11, which is a horizontal surface, decreases. If the rigidity of the base planar part 11, which is a horizontal surface, decreases, micro-displacement occurs independently during vibration in the high frequency band, and abnormal noise is likely to occur due to interference with the mounting surface. By providing a plurality of square holes 11sh in the horizontal direction of the base planar part 11, the number of connecting parts 11c increases, so that even if the square holes 11sh are provided to reduce weight, the strength of the base planar part 11 can be suppressed from decreasing.

[0045] 7, the two mounting holes 11h are arranged at a pitch of 305 mm in the base flat portion 11. In order to ensure the strength of the base flat portion 11, which is a horizontal surface, it is preferable to provide the rectangular holes 11sh at a pitch of about 100 mm in the lateral direction and provide the connecting portions 11c at a pitch of about 100 mm.

[0046] In the present embodiment 1, the base flat portion 11 is provided continuously in the horizontal direction (arrow X direction) and has a width larger than the width of the light source unit 100. The pair of connection surface portions 30 are configured by fixing together a pair of side surface bent portions 22 extending from both depth direction edge portions 21ef, 21eb of the side surface portion 21 to the side opposite the light source unit 100, and a pair of base bent portions 12 extending from both depth direction edge portions 11ef, 11eb at the right end or left end of the base flat portion 11 to the light source unit 100 side, i.e., downward.

[0047] The arm 200 has a plurality of connectors 42 (e.g., bolts, etc.) that secure the pair of side surface bending portions 22 and the pair of base bending portions 12 to one another. A connector hole 22h into which the connector 42 is inserted is formed in the upper portion of each of the pair of side surface bending portions 22, and a connector hole 12h into which the connector 42 inserted into each of the connector holes 22h of the pair of side surface bending portions 22 is formed in each of the pair of base bending portions 12.

[0048] Hereinafter, the pair of side surface bending portions 22 extending from the edges 21ef and 21eb of the first side surface portion 21L may be referred to as a pair of first side surface bending portions 22L, and the pair of side surface bending portions 22 extending from the edges 21ef and 21eb of the second side surface portion 21R may be referred to as a pair of second side surface bending portions 22R. Also, the pair of base bending portions 12 extending from the edges 11ef and 11eb at the left end of the base flat portion 11 may be referred to as a pair of first base bending portions 12L, and the pair of base bending portions 12 extending from the edges 11ef and 11eb at the right end of the base flat portion 11 may be referred to as a pair of second base bending portions 12R.

[0049] As described above, the arm 200 having the horizontally continuous base flat portion 11, the two side surface portions 21, 21, a pair of side surface bending portions 22 provided for each side surface portion 21, and a pair of base bending portions 12 provided at the left end and the right end of the base flat portion 11, can be composed of a total of three members, for example, one top surface arm 10 and two side arms 20, 20, as shown in Fig. 7. Hereinafter, of the two side arms 20, 20, the left side arm 20 may be referred to as the first side arm 20L, and the right side arm 20 may be referred to as the second side arm 20R.

[0050] In detail, the top arm 10 has a base flat portion 11, a pair of first base bent portions 12L, and a pair of second base bent portions 12R, and can be formed from one plate-like member. The first side arm 20L has a first side portion 21L and a pair of first side bent portions 22L, and can be formed from one plate-like member. The second side arm 20R has a second side portion 21R and a pair of second side bent portions 22R, and can be formed from one plate-like member.

[0051] 7, the arm 200 is defined as being composed of a total of three members, one top arm 10 and two side arms 20, 20, and the top arm 10 and each side arm 20 are connected by a connector 42, but the configuration of the arm 200 is not limited to this. For example, the arm 200 may be integrally molded without using the connector 42.

[0052] The top arm 10 also has a pair of front and rear connecting parts 13 that connect the front parts of the pair of first base bends 12L and the pair of second base bends 12R, and the rear parts of the pair of first base bends 12L and the pair of second base bends 12R. The front connecting part 13 extends downward from the front edge 11ef at the lateral center of the base flat part 11, and the rear connecting part 13 extends downward from the rear edge 11eb at the lateral center of the base flat part 11. By providing a pair of connecting parts 13 in this way, the cross-sectional shape of the top arm 10 can be made U-shaped with an angle even at the lateral center, and rigidity can be ensured.

[0053] The left and right ends of each connection portion 13 are inclined portions 14 whose vertical length (in the direction of the arrow Z) increases with increasing distance from the horizontal center position. The vertical length of the connection portion 13 is shorter than the vertical length of the base bending portion 12, and a space for arranging the DC power supply device 90 is secured between the top arm 10 and the light source unit 100.

[0054] Each side arm 20 has an extension plane portion 24 provided along the base plane portion 11 on the side farther from the light source unit 100 than the side portion 21 in the horizontal direction (arrow X direction). Hereinafter, the extension plane portion 24 of the first side arm 20L may be referred to as the first extension plane portion 24L, and the extension plane portion 24 of the second side arm 20R may be referred to as the second extension plane portion 24R. The first extension plane portion 24L of the first side arm 20L is disposed below the left end portion of the base plane portion 11, and the second extension plane portion 24R of the second side arm 20R is disposed below the right end portion of the base plane portion 11. A mounting hole 24h is formed in each extension plane portion 24 at a position facing the mounting hole 11h of the base plane portion 11, and each extension plane portion 24 is fixed to the base plane portion 11 by a fastener inserted into the mounting hole 24h and the mounting hole 11h. Then, the arm 200 to which the light source unit 100 is attached is attached to the attachment surface 1000 by this fixing tool.

[0055] In this way, when each side arm 20 has the extended flat portion 24, the portion of the arm 200 where the mounting hole 11h for the fastener is formed and fixed to the mounting surface 1000, i.e., the portion requiring strength, has a double structure. In this way, the double structure can be used to easily increase the thickness and stiffness of the portion requiring strength in the arm 200, while portions of the arm 200 subject to low stress can be constructed from a single plate-like member. Thus, it is possible to suppress unnecessary increases in mass in the arm 200 while increasing the stiffness of the portion attached to the mounting surface 1000 and increasing the strength of the lighting fixture 1 against vibration.

[0056] Each side arm 20 has an inclined surface portion 23 provided on the upper side of the side surface portion 21 and connecting the side surface portion 21 and the extended flat portion 24. Hereinafter, the inclined surface portion 23 of the first side arm 20L may be referred to as the first inclined surface portion 23L, and the inclined surface portion 23 of the second side arm 20R may be referred to as the second inclined surface portion 23R.

[0057] In detail, the first inclined surface portion 23L of the first side arm 20L extends upward to the left from an edge portion 21eu on the side (upper side) of the base flat portion 11 of the first side surface portion 21L, and is connected to an edge portion 24ei on the side (right side) of the light source unit 100 of the first extended flat surface portion 24L. Also, the second inclined surface portion 23R of the second side surface arm 20R extends upward to the right from an edge portion 21eu on the side (upper side) of the base flat portion 11 of the second side surface portion 21R, and is connected to an edge portion 24ei on the side (left side) of the light source unit 100 of the second extended flat surface portion 24R.

[0058] Ends 22eu of the pair of side surface bending portions 22 on the side of the base flat portion 11 (i.e., the upper side) protrude upward from the side surface portion 21 in the vertical direction (arrow Z direction), and are fixed to the pair of base bending portions 12 at the front and rear sides by connectors 42. That is, in the case where the arm 200 is composed of the top arm 10 and two side arms 20, 20, the connectors 42 connect the top arm 10 and each side arm 20.

[0059] The pair of side bent portions 22 can be formed by bending the members constituting the side arm 20 laterally on both sides in the depth direction of the side portion 21. The inclined surface portion 23 can be formed by bending the members constituting the side arm 20 obliquely on the upper side of the side portion 21, and the extended flat portion 24 can be formed by bending the members constituting the side arm 20 laterally on the upper side of the inclined surface portion 23. The pair of first base bent portions 12L, the pair of second base bent portions 12R, and the pair of connecting portions 13 can be formed by bending the members constituting the top arm 10 downward on both sides in the depth direction of the base flat portion 11.

[0060] In the example of the arm 200 shown in Fig. 1 and Fig. 7, the end portions 22eu of the pair of side bending portions 22 that protrude upward from the side portion 21 are not connected to the inclined surface portion 23, and are not fixed to the inclined surface portion 23. In the depth direction (arrow Y direction), the inclined surface portion 23 and the extended flat surface portion 24 are disposed between the upper end portions 22eu of the pair of side bending portions 22. Then, gaps G are formed on the front and rear sides between the upper end portions 22eu of the pair of side bending portions 22 and the inclined surface portion 23 and the extended flat surface portion 24. Then, the front and rear portions of the pair of base bending portions 12 of the top arm 10 are inserted into the front and rear gaps G of the side arm 20.

[0061] 1 and 7, the upper end portions 22eu of the pair of side surface bending portions 22 have corner portions 22euc that protrude toward the light source unit 100 side relative to the inclined surface portion 23. The upper end portions 22eu of the pair of side surface bending portions 22 on the light source unit 100 side may have no corner portions 22euc and may have an inclined shape along the inclined surface portion 23. However, providing the corner portions 22euc increases the area where the members are doubled near the connection portion between the top surface arm 10 and the side surface arm 20 where vibration is likely to occur, improving rigidity and effectively suppressing vibration.

[0062] As described above, the lighting fixture 1 according to the first embodiment includes the light source unit 100 and the arm 200 for attaching the light source unit 100 to the mounting surface 1000. The arm 200 is disposed between the mounting surface 1000 and the light source unit 100 when the light source unit 100 is attached to the mounting surface 1000, and has a base flat surface portion 11 facing the mounting surface 1000. The arm 200 has a first side surface portion 21L and a second side surface portion 21R that are disposed on both sides of the light source unit 100 in a second direction (arrow X direction) perpendicular to the first direction when the direction in which the mounting surface 1000 and the base flat surface portion 11 face each other is defined as a first direction (arrow Z direction), and are fixed to the light source unit 100. The arm 200 also has a pair of first connection surface portions 30L and a pair of second connection surface portions 30R. When a direction perpendicular to the first direction and the second direction is defined as a third direction (arrow Y direction), the pair of first connection surface portions 30L extend from the edge portions 21ef, 21eb on both sides in the third direction of the first side surface portion 21L in the second direction (arrow X direction) to the side opposite the light source unit 100, and connect the edge portions 21ef, 21eb on both sides in the third direction of the first side surface portion 21L to the edge portions 11ef, 11eb on both sides in the third direction of the base flat surface portion 11. The pair of second connection surface portions 30R extend from the edge portions 21ef, 21eb on both sides in the third direction of the second side surface portion 21R in the second direction (arrow X direction) to the side opposite the light source unit 100, and connect the edge portions 21ef, 21eb on both sides in the third direction of the second side surface portion 21R to the edge portions 11ef, 11eb on both sides in the third direction of the base flat surface portion 11. The pair of first connection surface portions 30L are provided from one end to the other end in the first direction (arrow Z direction) of edge portions 21ef, 21eb on both sides in the third direction of the first side surface portion 21L. The pair of second connection surface portions 30R are provided from one end to the other end in the first direction (arrow Z direction) of edge portions 21ef, 21eb on both sides in the third direction of the second side surface portion 21R.

[0063] In this way, the pair of first connection surface portions 30L extend from the first side surface portion 21L to the side opposite the light source unit 100, and therefore can be provided from one end to the other end of the edge portions 21ef, 21eb in the first side surface portion 21L in the first direction (arrow Z direction). Also, the pair of second connection surface portions 30R extend from the second side surface portion 21R to the side opposite the light source unit 100, and therefore can be provided from one end to the other end of the edge portions 21ef, 21eb in the first direction (arrow Z direction) in the second side surface portion 21R. As a result, the cross-sectional shape passing through the side surface portion 21 of the arm 200 is made into a cornered U-shape having higher rigidity than an I-shape by the side surface portion 21 and the pair of connection surface portions 30, and this cross-sectional shape is maintained from one end to the other end of the side surface portion 21 in the first direction. Therefore, it is possible to suppress localized reduction in rigidity at the side portion 21 of the arm 200 without increasing the plate thickness of the arm 200, and as a result, it is possible to provide a lighting device 1 having improved strength against vibration while suppressing unnecessary increase in mass.

[0064] The arm 200 includes a top arm 10, a first side arm 20L, and a second side arm 20R. The top arm 10 includes a base flat portion 11, a pair of first base bent portions 12L extending from both edge portions 11ef, 11eb in the third direction (arrow Y direction) on one side of the base flat portion 11 in the second direction (arrow X direction) toward the light source unit 100 side (lower side), and a pair of second base bent portions 12R extending from both edge portions 11ef, 11eb in the third direction on the other side of the base flat portion 11 in the second direction toward the light source unit 100 side. The first side arm 20L includes a first side portion 21L, and a pair of first side bent portions 22L extending from both edge portions 21ef, 21eb in the third direction of the first side portion 21L toward the opposite side (left side) from the light source unit 100. The second side arm 20R has a second side portion 21R and a pair of second side bends 22R extending from both edges 21ef, 21eb in the third direction of the second side portion 21R to the side opposite the light source unit 100 (right side). The pair of first connection surface portions 30L is formed by fixing a pair of first base bends 12L and a pair of first side bends 22L to each other. The pair of second connection surface portions 30R is formed by fixing a pair of second base bends 12R and a pair of second side bends 22R to each other.

[0065] This makes it easier to mold the arm 200 and reduces equipment costs compared to a conventional arm in which the arm horizontal section, arm bent section, and arm vertical section are provided in a continuous manner and the flange section is provided continuously over the arm horizontal section, arm bent section, and arm vertical section. To explain in detail, the conventional arm is molded by first bending the parallel edges of a plate-shaped member to form a flange section so that the cross section has a U-shape with corners, and then bending the arm bent section to form the arm bent section and arm vertical section. In this way, bending a member with a cross section having a U-shape with corners after the flange section is formed is difficult with general-purpose equipment, and a dedicated bending die is required, which increases equipment costs. In contrast, in the arm 200 of the first embodiment, the flange section (a pair of first connecting surface sections 30L and a pair of second connecting surface sections 30R) is configured by connecting a portion extending from the base flat section 11 and a portion extending from the side section 21 (first side section 21L and second side section 21R). Therefore, in the arm 200 of the first embodiment, there is no need to use a dedicated bending die for molding, as in the case of conventional arms.

[0066] The first side arm 20L has a first extension flat portion 24L provided along the base flat portion 11 on the side farther from the light source unit 100 (left side) than the first side surface portion 21L in the second direction (arrow X direction). The second side arm 20R has a second extension flat portion 24R provided along the base flat portion 11 on the side farther from the light source unit 100 (right side) than the second side surface portion 21R in the second direction (arrow X direction). The first extension flat portion 24L and the second extension flat portion 24R are each provided with a mounting hole 24h. The base flat portion 11 is provided with a mounting hole 11h in a portion overlapping the first extension flat portion 24L and a portion overlapping the second extension flat portion 24R.

[0067] As a result, in the arm 200, the peripheral portion of the mounting hole 11h of the base flat portion 11 where the load of the lighting device 1 is concentrated is reinforced by the extension flat portion 24 in a double structure. In the arm 200, the portion where the load is concentrated or where rigidity is required is locally reinforced by a double structure, so that the mass of the arm 200 can be reduced compared to the case where the plate thickness of the member itself is increased. Therefore, it is possible to reduce the weight of the lighting device 1 and the cost of materials. In addition, when the plate thickness of the member itself constituting the arm 200 is increased, the workability is deteriorated and the processing machines that can process the arm 200 are limited. However, in the present embodiment 2, the portion where rigidity is required is reinforced by a double structure, so that the deterioration of the workability due to the increase in the plate thickness of the member itself can be suppressed.

[0068] The first side arm 20L has a first inclined surface portion 23L that extends from an edge portion 21eu on the side (upper side) of the base flat portion 11 of the first side surface portion 21L at an incline with respect to the first side surface portion 21L and is connected to an edge portion 24ei on the side (right side) of the light source unit 100 of the first extended flat surface portion 24L. The second side arm 20R has a second inclined surface portion 23R that extends from an edge portion 21eu on the side (upper side) of the base flat portion 11 of the second side surface portion 21R at an incline with respect to the second side surface portion 21R and is connected to an edge portion 24ei on the side (left side) of the light source unit 100 of the second extended flat surface portion 24R.

[0069] In this way, by interposing the inclined surface portion 23 between the base flat portion 11 and the side surface portion 21, rigidity is improved, and deformation between the base flat portion 11 and the side surface portion 21 is less likely to occur. Furthermore, by providing the inclined surface portion 23, the area of ​​the extended flat portion 24 that contacts the base flat portion 11 can be reduced, and abnormal noise between the members can be suppressed. If the contact area between the members becomes large, microdeformation occurs in each member during high-frequency vibration, making it easier for abnormal noise to occur. For this reason, it is preferable to provide the inclined surface portion 23 and make the extended flat portion 24 as small as possible.

[0070] Further, an outer edge 30eo on the side opposite to the light source unit 100 (left side) of each of the pair of first connection surfaces 30L (front connection surface 30F, rear connection surface 30B) is inclined with respect to an inner edge 30ei on the side of the first side surface 21L (right side). An outer edge 30eo on the side opposite to the light source unit 100 (right side) of each of the pair of second connection surfaces 30R (front connection surface 30F, rear connection surface 30B) is inclined with respect to an inner edge 30ei on the side of the second side surface 21R (left side).

[0071] As a result, the cross-sectional shape of the arm 200 on the side of the light source unit 100 can be made into a U-shape with an angle by the side surface portion 21 and the pair of connecting surface portions 30, thereby improving the rigidity, and among them, the portion that contributes little to the strength of the arm 200 (i.e., the lower portion of the pair of connecting surface portions 30) can be eliminated, thereby reducing the weight and material costs of the lighting fixture 1. Also, depending on the shape of the outer edge portion 30eo of the pair of connecting surface portions 30, the strength of the arm 200, particularly the side arm 20, can be finely adjusted.

[0072] Furthermore, the lighting fixture 1 includes a DC power supply device 90 that is disposed between the light source unit 100 and the base flat portion 11 and supplies power to the light source unit 100. In this way, even when the DC power supply device 90 is provided between the light source unit 100 and the base flat portion 11 and the arm 200 is subjected to the load of the DC power supply device 90 in addition to the load of the light source unit 100, the configuration of the arm 200 described above makes it possible to provide a lighting fixture 1 that is less likely to vibrate.

[0073] Embodiment 2 FIG. 8 is a perspective view of the lighting fixture 1 according to the second embodiment as viewed from the upper right front. FIG. 9 is an exploded perspective view of the arm 200 in FIG. 8. In the first embodiment, the flat surface of the arm 200 facing the mounting surface 1000 is one continuous base flat surface 11 in the horizontal direction (arrow X direction). In the second embodiment, the flat surface of the arm 200 facing the mounting surface 1000 is composed of two base flat surfaces 211 spaced apart in the horizontal direction (arrow X direction). Hereinafter, the configuration of the arm 200 in the lighting fixture 1 according to the second embodiment will be described with reference to FIG. 8 and FIG. 9. Note that in the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations as those in the first embodiment will be described using the same reference numerals.

[0074] 8, in the second embodiment, the arm 200 has two side arms 20, 20 (a first side arm 20L and a second side arm 20R) fixed to side surfaces 101, 102 on both lateral sides of the light source unit 100, and two top arms 210 arranged above each side arm 20. The configuration of the side arm 20 is the same as in the first embodiment.

[0075] 9, the top surface arm 210 has a base flat portion 211 and a pair of base bent portions 212 extending from edges 211ef, 211eb on both sides in the depth direction of the base flat portion 211 toward the side (lower side) of the light source unit 100. Hereinafter, of the two top surface arms 210, the top surface arm 210 arranged above the first side surface arm 20L on the left side may be referred to as the first top surface arm 210L, and the top surface arm 210 arranged above the second side surface arm 20R on the right side may be referred to as the second top surface arm 210R. In addition, the base planar portion 211 and a pair of base bending portions 212 of the first top surface arm 210L may be referred to as the first base planar portion 211L and a pair of first base bending portions 212L, and the base planar portion 211 and a pair of base bending portions 212 of the second top surface arm 210R may be referred to as the second base planar portion 211R and a pair of second base bending portions 212R.

[0076] The pair of first connection surface portions 30L are formed by fixing a pair of first base bent portions 212L of the first top arm 210L and a pair of first side surface bent portions 22L of the first side arm 20L to each other. The pair of second connection surface portions 30R are formed by fixing a pair of second base bent portions 212R of the second top arm 210R and a pair of second side surface bent portions 22R of the second side arm 20R to each other.

[0077] Each of the two top arms 210 can be constructed by bending a single plate-like member. Before bending, mounting holes 11h and the like are punched into the plate-like member. Specifically, the ends on both sides in the depth direction of the plate-like member constituting the top arm 210 are bent downward to form a pair of base bent portions 212. Similarly to the first embodiment, each of the two side arms 20 can be constructed by bending a single plate-like member. Before bending, square holes 21sh and the like are punched into the plate-like member.

[0078] In the lighting device 1 of the second embodiment, the base planar portion 11 of the arm 200 is composed of a first base planar portion 211L and a second base planar portion 211R that are spaced apart in the second direction (the direction of the arrow X). The arm 200 includes a first top surface arm 210L, a second top surface arm 210R, a first side arm 20L, and a second side arm 20R. The first top surface arm 210L includes a first base planar portion 211L and a pair of first base bent portions 212L that extend from edges 211ef, 211eb on both sides in the third direction of the first base planar portion 211L toward the light source unit 100 (downward). The second top surface arm 210R has a second base flat portion 211R and a pair of second base bent portions 212R extending from both edge portions 211ef, 211eb in the third direction of the second base flat portion 211R toward the side (lower side) of the light source unit 100. The first side arm 20L has a first side portion 21L and a pair of first side bent portions 22L extending from both edge portions 21ef, 21eb in the third direction of the first side portion 21L toward the side opposite the light source unit 100 (left side). The second side arm 20R has a second side portion 21R and a pair of second side bent portions 22R extending from both edge portions 21ef, 21eb in the third direction of the second side portion 21R toward the side opposite the light source unit 100 (right side). The pair of first connection surface portions 30L is formed by fixing the pair of first base bent portions 212L and the pair of first side surface bent portions 22L to each other. The pair of second connection surface portions 30R is formed by fixing the pair of second base bent portions 212R and the pair of second side surface bent portions 22R to each other.

[0079] Thus, in the second embodiment, as in the first embodiment, the flange portion (a pair of first connecting surface portions 30L, a pair of second connecting surface portions 30R) of the arm 200 is configured by connecting a portion extending from the base planar portion 11 (first base planar portion 211L, second base planar portion 211R) and a portion extending from the side portion 21 (first side portion 21L, second side portion 21R). Therefore, in the second embodiment, as in the first embodiment, molding of the arm 200 is easier than in the conventional configuration, and equipment costs can also be reduced.

[0080] In addition, the arm 200 has the first top surface arm 210L and the second top surface arm 210R, and the flat portion facing the mounting surface 1000 is divided into the first base flat portion 211L and the second base flat portion 211R, so that the mass can be reduced compared to when it is composed of one continuous member. This allows the lighting fixture 1 to be made lighter and the material costs to be reduced.

[0081] 7, the portion inside the two side arms 20 contributes less to the strength of the arm 200 than the portions in contact with each side arm 20, and even if this portion is not present, the strength of the arm 200 can be ensured to a certain degree or more. Therefore, whether or not to configure the top arm to be divided into two as in the second embodiment may be appropriately determined depending on, for example, the shape of the light source unit 100 supported by the arm 200 or whether or not a DC power supply device 90 is installed in the light source unit 100.

[0082] Embodiment 3 FIG. 10 is a perspective view of the top side arm 310 of the arm 200 of the lighting fixture 1 according to the third embodiment. In the third embodiment, as in the second embodiment, the flat portion of the arm 200 facing the mounting surface 1000 is composed of two base flat portions 311 spaced apart in the horizontal direction (arrow X direction). In the second embodiment, the arm 200 is composed of two top arms 210, 210 and two side arms 20, 20, which are a total of four members, but in the third embodiment, the arm 200 is composed of two top side arms 310 in which the top arm 210 and the side arm 20 are integrated. Hereinafter, the configuration of the arm 200 in the lighting fixture 1 according to the third embodiment will be described with reference to FIG. 10. In the third embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations as those in the first embodiment will be described using the same reference numerals.

[0083] As shown in Fig. 10, the top side arm 310 has a base flat portion 311, a side portion 21, and a pair of connecting surface portions 30 that connect the base flat portion 311 and the side portion 21. Hereinafter, of the two top side arms 310, the left top side arm 310 may be referred to as the first top side arm 310L, and the right top side arm 310 may be referred to as the second top side arm 310R. In Fig. 10, only the right top side arm 310 (second top side arm 310R) of the two top side arms 310 is illustrated, and the first top side arm 310L is not illustrated, but the first top side arm 310L has a shape that is a left-right inversion of the second top side arm 310R. Hereinafter, the base plane portion 311, side surface portion 21, and pair of connection surface portions 30 of the first top side arm 310L may be referred to as the first base plane portion 311L, the first side surface portion 21L, and pair of first connection surface portions 30L. Also, the base plane portion 311, side surface portion 21, and pair of connection surface portions 30 of the second top side arm 310R may be referred to as the second base plane portion 311R, the second side surface portion 21R, and pair of second connection surface portions 30R.

[0084] The pair of second connection surface portions 30R are a pair of side surface bends 322 (hereinafter also referred to as a pair of second side surface bends 322R) extending from the edges 21ef, 21eb on both sides in the depth direction of the right second side surface portion 21R to the side opposite the light source unit 100 (right side). In detail, the pair of second side surface bends 322R extend to the right from the edges 21ef, 21eb on both sides in the depth direction of the right second side surface portion 21R, and the upper end portions 30eu extend to the side (upper side) of the second base flat portion 311R. The pair of second connection surface portions 30R is composed of the pair of second side surface bends 322R, and the upper end portions 30eu are joined to the edges 311ef, 311eb on both sides in the depth direction of the second base flat portion 311R.

[0085] The pair of first connecting surface portions 30L (not shown) are a pair of side surface bends 322 (hereinafter also referred to as a pair of first side surface bends 322L) extending from the edges 21ef, 21eb on both sides in the depth direction of the left first side surface portion 21L to the side opposite the light source unit 100 (left side). In detail, the pair of first side surface bends 322L extend leftward from the edges 21ef, 21eb on both sides in the depth direction of the left first side surface portion 21L, and the upper end portions 30eu extend toward the side (upper side) of the first base flat portion 311L. The pair of first connecting surface portions 30L is constituted by the pair of first side surface bends 322L, and the upper end portions 30eu are joined to the edges 311ef, 311eb on both sides in the depth direction of the first base flat portion 311L.

[0086] Moreover, each top side arm 310 has an inclined surface portion 323 provided on the upper side of the side surface portion 21 and connecting the side surface portion 21 and the base flat portion 311. Hereinafter, the inclined surface portion 323 of the first top side arm 310L may be referred to as the first inclined surface portion 323L, and the inclined surface portion 323 of the second top side arm 310R may be referred to as the second inclined surface portion 323R.

[0087] The first base planar portion 311L on the left side is provided on a side farther (left side) from the light source unit 100 in the horizontal direction (arrow X direction) than the first side surface portion 21L. The second base planar portion 311R on the right side is provided on a side farther (right side) from the light source unit 100 in the horizontal direction (arrow X direction) than the second side surface portion 21R.

[0088] The first inclined surface portion 323L of the first top side arm 310L extends upward to the left from the upper edge portion 21eu of the first side surface portion 21L and is connected to the edge portion 24ei on the side of the light source unit 100 (i.e., the right side) of the first base flat surface portion 311L. The second inclined surface portion 323R of the second top side surface arm 310R extends upward to the right from the upper edge portion 21eu of the second side surface portion 21R and is connected to the edge portion 24ei on the side of the light source unit 100 (i.e., the left side) of the second base flat surface portion 311R.

[0089] In embodiment 3, the end portion 322eu of a pair of side bending portions 322 that protrudes upward from the side portion 21 does not have the corner portion 22euc shown in Figure 7, and the side of the end portion 322eu facing the light source unit 100 is inclined to follow the inclined surface portion 323.

[0090] Each of the two top side arms 310 can be formed by bending one plate-shaped member and joining the boundary by welding, etc. Before bending the plate-shaped member, the mounting holes 11h and square holes 21sh, etc. are punched out.

[0091] Specifically, the member is bent laterally (in the direction of the arrow X) at edges 21ef, 21eb on both sides in the depth direction of the side surface portion 21 to form a pair of side surface bent portions 322. The member is bent diagonally upward at an upper edge 21eu of the side surface portion 21 to form an inclined surface portion 323, and the member is further bent laterally (horizontally) at an upper edge of the inclined surface portion 323 to form the base flat portion 311.

[0092] Then, edges of the end portions 322eu of the pair of side surface bending portions 322 protruding upward from the side surface portion 21 are joined to the edges 311ef, 311eb on both sides in the depth direction of the base flat surface portion 311 and the edges 323ef, 323eb on both sides in the depth direction of the inclined surface portion 323. This eliminates the need for the connectors 42 (see FIG. 1) that fasten the members together, and also reduces the overlapping portions of the members fixed together by the connectors 42.

[0093] The method for forming the top side arm 310 is not limited to the above method.

[0094] In the lighting fixture 1 of the third embodiment, the base planar portion 11 of the arm 200 is composed of a first base planar portion 311L and a second base planar portion 311R that are spaced apart in the second direction (the direction of the arrow X). The arm 200 includes a first top side arm 310L having the first base planar portion 311L, a first side surface portion 21L, and a pair of first connecting surface portions 30L, and a second top side arm 310R having a second base planar portion 311R, a second side surface portion 21R, and a pair of second connecting surface portions 30R. The pair of first connecting surface portions 30L extend from the edge portions 21ef, 21eb on both sides in the third direction of the first side portion 21L toward the side opposite the light source unit 100 (left side), and the end portions 322eu in the first direction (arrow Z direction) of the pair of first connecting surface portions 30L extend toward the side (upper side) of the first base planar portion 311L and are joined to the edge portions 311ef, 311eb on both sides in the third direction of the first base planar portion 311L. In addition, the pair of second connection surface portions 30R extend from the edge portions 21ef, 21eb on both sides in the third direction of the second side surface portion 21R to the side opposite the light source unit 100 (right side), and the end portions 322eu in the first direction (arrow Z direction) of the pair of second connection surface portions 30R extend to the side (upper side) of the second base planar portion 311R and are joined to the edge portions 311ef, 311eb on both sides in the third direction of the second base planar portion 311R.

[0095] Thus, in the third embodiment, the flange portion (a pair of first connecting surface portions 30L, a pair of second connecting surface portions 30R) of the arm 200 is formed by joining a pair of side surface bending portions 322 (a pair of first side surface bending portions 322L, a pair of second side surface bending portions 322R) extending from the side surface portion 21 (first side surface portion 21L, second side surface portion 21R) to the base flat portion 11 (first base flat portion 311L, second base flat portion 311R). Therefore, in the third embodiment as in the first embodiment, molding of the arm 200 is easier than in the conventional configuration, and equipment costs can also be reduced.

[0096] Furthermore, in the third embodiment, compared to the first embodiment in which a pair of base bending portions 12 and a pair of side bending portions 22 are fixed to each other to form a pair of connecting surface portions 30, the area required for doubling the members for fixing is smaller, and the mass of the arm 200 can be reduced. This allows the lighting fixture 1 to be made lighter and the material costs to be reduced.

[0097] In addition, in the third embodiment, the left and right parts of the arm 200 are each made of one member, eliminating the need to configure the left and right parts of the arm 200 as two separate parts, the top arm 210 and the side arm 20, as in the second embodiment. This allows the number of parts in the arm 200 and the lighting fixture 1 to be reduced.

[0098] The first base flat surface 311L is provided on the side farther from the light source unit 100 (left side) than the first side surface 21L in the second direction (arrow X direction). The second base flat surface 311R is provided on the side farther from the light source unit 100 (right side) than the second side surface 21R in the second direction (arrow X direction). The first top side surface arm 310L has a first inclined surface portion 323L. The first inclined surface portion 323L extends from an edge portion 21eu on the side (upper side) of the base flat surface 311 of the first side surface portion 21L at an angle with respect to the first side surface portion 21L, and is connected to an edge portion 311ei on the side (right side) of the light source unit 100 of the first base flat surface portion 311L. In addition, the second top side arm 310R has a second inclined surface portion 323R, which extends at an angle from the edge 21eu on the side (upper side) of the base flat portion 311 of the second side portion 21R to the second side portion 21R, and is connected to the edge 311ei on the side (left side) of the light source unit 100 of the second base flat portion 311R.

[0099] In this way, by interposing the inclined surface portion 23 between the base flat portion 311 and the side surface portion 21, the rigidity is improved, and deformation of the side surface portion 21 and the base flat portion 311 becomes less likely to occur.

[0100] Various aspects of the present disclosure are described below.

[0101] (Appendix 1) A lighting fixture including a light source unit and an arm for mounting the light source unit to a mounting surface, The arm is a base flat surface portion disposed between the mounting surface and the light source unit and facing the mounting surface when the light source unit is mounted on the mounting surface; a first side surface portion and a second side surface portion that are respectively disposed on both sides of the light source unit in a second direction perpendicular to the first direction when a direction in which the mounting surface and the base flat portion face each other is defined as a first direction and that are fixed to the light source unit; a pair of first connection surface portions extending from edge portions on both sides of the first side surface portion in the third direction to a side opposite the light source unit in the second direction, when a direction perpendicular to each of the first direction and the second direction is defined as a third direction, and connecting the edge portions on both sides of the first side surface portion in the third direction and the edge portions on both sides of the base flat surface portion in the third direction; a pair of second connection surfaces extending from edge portions on both sides in the third direction of the second side surface portion toward a side opposite the light source unit in the second direction and connecting the edge portions on both sides in the third direction of the second side surface portion and the edge portions on both sides in the third direction of the base flat surface portion, The pair of first connection surface portions are provided from one end to the other end in the first direction of the edge portions on both sides in the third direction of the first side portion, The pair of second connection surface portions are provided from one end to the other end in the first direction of the edge portions on both sides in the third direction of the second side portion. Lighting fixtures. (Appendix 2) The arm is a top arm including the base plane portion, a pair of first base bent portions extending from the edge portions on both sides in the third direction on one side of the base plane portion in the second direction toward the light source unit, and a pair of second base bent portions extending from the edge portions on both sides in the third direction on the other side of the base plane portion in the second direction toward the light source unit; a first side arm including the first side portion and a pair of first side bent portions extending from the edge portions on both sides of the first side portion in the third direction to a side opposite the light source unit; a second side arm having the second side portion and a pair of second side bending portions extending from the edge portions on both sides of the second side portion in the third direction to a side opposite the light source unit, the pair of first connection surface portions are configured by fixing the pair of first base bent portions and the pair of first side surface bent portions to each other, The pair of second connection surface portions are configured by fixing the pair of second base bent portions and the pair of second side surface bent portions to each other. 2. A luminaire as described in Appendix 1. (Appendix 3) the base planar portion is composed of a first base planar portion and a second base planar portion spaced apart from each other in the second direction, The arm is a first top arm including the first base planar portion and a pair of first base bent portions extending from both edge portions of the first base planar portion in the third direction toward the light source unit; a second top arm including the second base planar portion and a pair of second base bent portions extending from both edge portions of the second base planar portion in the third direction toward the light source unit; a first side arm including the first side portion and a pair of first side bent portions extending from the edge portions on both sides of the first side portion in the third direction to a side opposite the light source unit; a second side arm having the second side portion and a pair of second side bending portions extending from the edge portions on both sides of the second side portion in the third direction to a side opposite the light source unit, the pair of first connection surface portions are configured by fixing the pair of first base bent portions and the pair of first side surface bent portions to each other, The pair of second connection surface portions are configured by fixing the pair of second base bent portions and the pair of second side surface bent portions to each other. 2. A luminaire as described in Appendix 1. (Appendix 4) the first side arm has a first extension planar portion provided along the base planar portion on a side farther from the light source unit than the first side portion in the second direction, the second side arm has a second extension planar portion provided along the base planar portion on a side farther from the light source unit than the second side portion in the second direction, The first extension plane portion and the second extension plane portion each have a mounting hole, The base flat surface has a mounting hole formed in a portion overlapping the first extension flat surface and a portion overlapping the second extension flat surface. 5. A luminaire as described in appendix 2 or 3. (Appendix 5) the first side arm has a first inclined surface portion extending from an edge portion of the first side surface portion on a side of the base flat portion at an incline with respect to the first side surface portion and connected to an edge portion of the first extended flat portion on a side of the light source unit; The second side arm has a second inclined surface portion extending from an edge portion of the second side surface portion on the side of the base flat portion at an incline with respect to the second side surface portion and connected to an edge portion of the second extension flat portion on the side of the light source unit. 3. A luminaire as described in Appendix 4. (Appendix 6) the base planar portion is composed of a first base planar portion and a second base planar portion spaced apart from each other in the second direction, The arm is a first top side arm having the first base plane portion, the first side portion, and the pair of first connection surface portions; a second top side arm having the second base plane portion, the second side portion, and the pair of second connection surface portions, the pair of first connection surface portions extend from the edge portions on both sides in the third direction of the first side surface portion to a side opposite the light source unit, and end portions of the pair of first connection surface portions in the first direction extend toward the first base planar portion and are joined to the edge portions on both sides in the third direction of the first base planar portion, The pair of second connection surface portions extend from the edge portions on both sides in the third direction of the second side surface portion to the side opposite the light source unit, and end portions of the pair of second connection surface portions in the first direction extend toward the second base planar portion and are joined to the edge portions on both sides in the third direction of the second base planar portion. 2. A luminaire as described in Appendix 1. (Appendix 7) the first base plane portion is provided on a side farther from the light source unit than the first side surface portion in the second direction, the second base plane portion is provided on a side farther from the light source unit than the second side surface portion in the second direction, the first top side arm has a first inclined surface portion extending from an edge portion of the first side surface portion on a side of the base flat portion at an incline with respect to the first side surface portion and connected to an edge portion of the first base flat portion on a side of the light source unit; The second top side arm has a second inclined surface portion extending from an edge of the second side surface portion on the side of the base flat portion at an incline with respect to the second side surface portion and connected to an edge of the second base flat portion on the side of the light source unit. 5. A luminaire as described in Appendix 6. (Appendix 8) an outer edge portion of each of the pair of first connection surfaces on a side opposite to the light source unit is inclined with respect to an inner edge portion on a side of the first side surface portion, An outer edge portion of each of the pair of second connection surfaces on a side opposite to the light source unit is inclined with respect to an inner edge portion on the side of the second side surface portion. 8. A lighting device according to any one of claims 1 to 7. (Appendix 9) A DC power supply device is disposed between the light source unit and the base flat surface portion and supplies power to the light source unit. 9. A lighting device according to any one of claims 1 to 8. [Explanation of symbols]

[0102] 1 Lighting fixture, 10 Top arm, 11 Base flat portion, 11c Joint portion, 11eb Edge portion, 11ef Edge portion, 11h Mounting hole, 11sh Square hole, 12 Base bend portion, 12h Connection hole, 13 Connection portion, 14 Slope portion, 20 Side arm, 21 Side portion, 21eb Edge portion, 21ef Edge portion, 21eu Edge portion, 21h Fixing hole, 21sh Square hole, 22 Side bend portion, 22eu End portion, 22euc Corner portion, 22h Connection hole, 23 Slope surface portion, 24 Extension flat portion, 24ei Edge portion, 24h Mounting hole, 30 Connection surface portion, 30B Connection surface portion, 30F Connection surface portion, 30ei Inner edge portion, 30eo Outer edge portion, 30eu End portion, 41 Connection member, 42 Connector, 43 cover fixing device, 44 fixing device, 50 cover, 51 lens portion, 52 cover flange portion, 52h flange portion hole, 60 light source, 61 board, 62 light emitting element, 70 heat sink, 71 base, 71h1 hole, 71h2 hole, 72 fin, 72L fin, 72R fin, 80 power supply mounting bracket, 81 bracket flat portion, 82 bracket side portion, 83 bracket reinforcement portion, 90 DC power supply unit, 91 power supply board, 91c case bottom, 92 power supply case, 93 side packing, 94 power supply end plate, 94b extension portion, 94bh fixing hole, 95 lead wire, 96 wiring case, 100 light source unit, 101 side, 102 side, 200 arm, 210 top arm, 211 base flat portion, 211eb edge portion, 211ef Edge, 212 Base bent part, 310 Top arm, 311 Base flat part, 311eb Edge, 311ef Edge, 311ei Edge, 322 Side bent part, 322eu End, 323 Slanted surface, 323L First inclined surface, 323R Second inclined surface, 323eb Edge, 323ef Edge, 1000 Mounted surface, G gap, Wsh opening width.

Claims

1. A lighting fixture comprising a light source unit and an arm for attaching the light source unit to a mounting surface, The aforementioned arm is In the state in which the light source unit is attached to the mounting surface, a base flat portion is positioned between the mounting surface and the light source unit, and the base flat portion faces the mounting surface, When the direction in which the mounting surface and the base planar portion face each other is defined as the first direction, the first side portion and the second side portion are arranged on both sides of the light source unit in a second direction perpendicular to the first direction and are fixed to the light source unit, When the third direction is defined as the direction perpendicular to the first and second directions, a pair of first connecting surfaces extend from the edges on both sides of the first side surface in the third direction toward the side opposite to the light source unit in the second direction, connecting the edges on both sides of the first side surface in the third direction with the edges on both sides of the base plane in the third direction, The second side portion has a pair of second connecting surfaces that extend from the edges on both sides in the third direction of the second side portion toward the side opposite to the light source unit in the second direction, and connect the edges on both sides in the third direction of the second side portion with the edges on both sides in the third direction of the base plane portion. Lighting fixtures.

2. The aforementioned arm is A top arm having the base flat portion, a pair of first base bends extending toward the light source unit from the edges on both sides in the third direction on one side of the base flat portion in the second direction, and a pair of second base bends extending toward the light source unit from the edges on both sides in the third direction on the other side of the base flat portion in the second direction, A first side arm having the first side portion and a pair of first side bends extending from the edges on both sides of the first side portion in the third direction toward the side opposite to the light source unit, The device comprises a second side portion and a second side arm having a pair of second side bends extending from the edges on both sides of the second side portion in the third direction toward the side opposite to the light source unit, The pair of first connecting surfaces are formed by fixing the pair of first base bends and the pair of first side bends to each other. The pair of second connecting surfaces are formed by fixing the pair of second base bends and the pair of second side bends to each other. The lighting fixture according to claim 1.

3. The base planar portion is composed of a first base planar portion and a second base planar portion, which are spaced apart in the second direction. The aforementioned arm is A first top arm having a first base flat portion and a pair of first base bends extending from the edges on both sides of the first base flat portion in the third direction toward the light source unit, A second top arm having the second base planar portion and a pair of second base bends extending from the edges on both sides of the second base planar portion in the third direction toward the light source unit, A first side arm having the first side portion and a pair of first side bends extending from the edges on both sides of the first side portion in the third direction toward the side opposite to the light source unit, The device comprises a second side portion and a second side arm having a pair of second side bends extending from the edges on both sides of the second side portion in the third direction toward the side opposite to the light source unit, The pair of first connecting surfaces are formed by fixing the pair of first base bends and the pair of first side bends to each other. The pair of second connecting surfaces are formed by fixing the pair of second base bends and the pair of second side bends to each other. The lighting fixture according to claim 1.

4. The first side arm has a first extended planar portion provided along the base planar portion on the side further from the light source unit than the first side portion in the second direction, The second side arm has a second extended planar portion provided along the base planar portion on the side further from the light source unit than the second side portion in the second direction, Mounting holes are provided in the first extended planar portion and the second extended planar portion, Mounting holes are provided in the base flat portion where it overlaps with the first extended flat portion and where it overlaps with the second extended flat portion. The lighting fixture according to claim 2 or 3.

5. The first side arm has a first inclined surface portion that extends inclined relative to the first side portion from the edge on the side of the base plane portion of the first side portion and is connected to the edge on the side of the light source unit of the first extended plane portion. The second side arm has a second inclined surface portion that extends inclined relative to the second side portion from the edge of the base plane portion on the second side portion and is connected to the edge of the second extension plane portion on the side of the light source unit. The lighting fixture according to claim 4.

6. The base planar portion is composed of a first base planar portion and a second base planar portion, which are spaced apart in the second direction. The aforementioned arm is A first top side arm having the first base planar portion, the first side portion, and the pair of first connecting surface portions, It comprises the second base planar portion, the second side portion, and the second top side arm having the pair of second connecting surface portions, The pair of first connecting surfaces extend from the edges on both sides in the third direction of the first side surface toward the side opposite to the light source unit, and the ends of the pair of first connecting surfaces in the first direction extend toward the side of the first base plane and are joined to the edges on both sides in the third direction of the first base plane. The pair of second connecting surfaces extend from the edges on both sides in the third direction of the second side surface toward the side opposite to the light source unit, and the ends of the pair of second connecting surfaces in the first direction extend toward the second base plane and are joined to the edges on both sides in the third direction of the second base plane. The lighting fixture according to claim 1.

7. The first base planar portion is provided on the side further from the light source unit than the first side portion in the second direction. The second base planar portion is provided on the side further from the light source unit than the second side portion in the second direction. The first top side arm has a first inclined surface portion that extends inclined with respect to the first side portion from the edge of the base planar portion on the first side portion and is connected to the edge of the first base planar portion on the side of the light source unit, The second top side arm has a second inclined surface portion that extends inclined relative to the second side portion from the edge of the base plane portion on the second side portion and is connected to the edge of the second base plane portion on the side of the light source unit. The lighting fixture according to claim 6.

8. The outer edge on the side opposite to the light source unit of each of the pair of first connecting surfaces is inclined with respect to the inner edge on the side of the first side surface. The outer edge on the side opposite to the light source unit of each of the pair of second connecting surfaces is inclined with respect to the inner edge on the side of the second side surface. A lighting fixture according to any one of claims 1 to 3.

9. The light source unit and the base flat portion are positioned between them and include a DC power supply that supplies power to the light source unit. A lighting fixture according to any one of claims 1 to 3.

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