Lighting fixture

Abstract

To provide a lighting fixture capable of securing radiation performance and insulation performance.SOLUTION: A lighting fixture comprises: a light source board 151 with a light emitting element mounted on one side; a heat sink 110 arranged on the other side of the light source board 151, and exposed to the outside; a first sheet (radiation sheet 171) arranged between the light source board 151 and the heat sink 110, and having insulation performance; and a second sheet (insulation sheet 172) arranged between the light source board 151 and the heat sink 110 to overlap the first sheet (radiation sheet 171), and having insulation performance.SELECTED DRAWING: Figure 15

Description

Technical Field

[0001] The present invention relates to a lighting fixture.

Background Art

[0002] Conventionally, in a lighting fixture having a light-emitting module with a light-emitting element provided on a substrate, a substrate is attached to a heat sink via a heat-dissipating sheet having insulating properties.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, when fixing a substrate using a conductive base material and a conductive heat sink, an insulating material is interposed for fixing. This makes it possible to ensure insulation performance and prevent destruction due to external surges or the like. On the other hand, since a heat-dissipating sheet that achieves both insulation and heat dissipation is composed of various materials, it tends to be expensive.

[0005] The present invention , provides a configuration capable of ensuring insulation performance.

Means for Solving the Problems

[0006] The lighting fixture of the present invention includes a light source substrate with a light-emitting element mounted on one side, a heat sink disposed on the other side of the light source substrate and exposed to the outside, a first sheet disposed between the light source substrate and the heat sink and having insulation performance, and a second sheet disposed overlapping the first sheet between the light source substrate and the heat sink and having insulation performance is provided with.

Advantages of the Invention

[0007] According to the present invention, By stacking and arranging a first sheet having insulating performance and a second sheet having insulating performance, insulation performance can be ensured.

Brief Description of the Drawings

[0008]

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Figure 15

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. In the description of the embodiments, the description of the same or corresponding parts will be omitted or simplified as appropriate. Also, regarding the configurations of devices, instruments, parts, etc., their materials, shapes, sizes, etc. can be changed as appropriate within the scope of the present invention.

[0010] Embodiment 1. With reference to the drawings, the configuration of the lighting fixture according to Embodiment 1 will be described. ***Description of the configuration*** ● FIG. 1 (Lighting fixture 1) FIG. 1 is a perspective view of a lighting fixture 1 attached to the ceiling of a facility with a high ceiling such as a gymnasium. The lighting fixture 1 includes an arm 10 attached to the mounting portion and a light source unit 100 held rotatably on the arm 10.

[0011] ● FIGS. 2 to 4 FIG. 2 is an exploded perspective view of the lighting fixture 1 in FIG. 1. FIG. 3 is an exploded perspective view of the lighting fixture 1 as viewed from the direction of arrow A in FIG. 2.

[0012] The lighting fixture 1 includes an arm 10 and a light source unit 100. The light source unit 100 includes a heat sink 110, a power supply unit 120, a connecting portion 130, a reinforcing portion 140, a light source portion 150, a cover portion 160, and a sheet 170.

[0013] (Arm 10) The arm 10 is formed in a substantially U shape, and mounting holes 11 for fixing to the mounting portion with fixtures (bolts, etc.) are formed.

[0014] (Heat sink 110) FIG. 4 is a perspective view of the heat sink 110. The heat sink 110 has a plate-shaped base portion 111 to which the light source unit 150 is attached, a plurality of fin portions 112 radially arranged on the base portion 111, and a top plate portion 113 attached so as to cover the fin portions 112. The base portion 111 and the top plate portion 113 are square or rectangular plate-shaped mounting members.

[0015] In FIG. 4, the base portion 111 and the top plate portion 113 are squares with a side length of L and have an arc with a 90-degree inner angle and a radius of R at the corners. The length of the straight portion of each side of the base portion 111 and the top plate portion 113 is M, and L = M + 2R.

[0016] The base portion 111 has four screw holes 1119 at the corners and one screw hole 1118 at the center of each side. The screw hole 1118 is closer to each side than the screw hole 1119 in order to avoid the fin portion 112.

[0017] The top plate portion 113 has four screw holes 1139 at the corners and two screw holes 1119 at the center of each side. The base portion 111 and the top plate portion 113 have a plurality of holes for fixing the fin portion 112 inside. The base portion 111 and the top plate portion 113 are arranged separately with the fin portion 112 in between.

[0018] The lower part of the fin portion 112 is fixed to the base portion 111, and the upper part of the fin portion 112 is fixed to the top plate portion 113. The upper and lower ends of the outer peripheral end of the fin portion 112 have notches 1121 so as not to interfere with other parts and screws. The heat sink 110 may be composed of only the base portion 111.

[0019] In this embodiment, the fin portion 112 is a sheet metal bent in a U shape, but it may also be a sheet metal bent in an L shape or an I-shaped sheet metal. Further, the fin portion 112 may be manufactured not only by sheet metal but also by aluminum extrusion molding or aluminum die-casting molding, and the base portion 111 and the fin portion 112 may be integrated.

[0020] (Power supply unit 120) The power supply unit 120 supplies power for lighting the light source unit 150 when power is supplied from the outside. The power supply unit 120 includes a lighting circuit unit 121 that converts power from the outside into power for lighting the light source unit 150, a harness 122 that is connected to the lighting circuit unit 121 and the light source unit 150 and supplies power to the light source unit 150, and a case unit 123 that is attached to the top plate portion 113 so as to cover the lighting circuit unit 121. There are two wirings 1221 at the tip of the harness 122. The lighting circuit unit 121 has a power supply board 1222 on which a lighting circuit is mounted.

[0021] (Connection part 130) The connection part 130 is disposed on both opposite side surfaces of the heat sink 110 and is for attaching the arm 10.

[0022] (Reinforcement part 140) The reinforcement part 140 has a U-shaped cross section and is attached so as to cover the side of the base part of the heat sink 110. The reinforcement part 140 supplements the strength of the heat sink 110.

[0023] (Light source unit 150) The light source unit 150 includes a light source board 151 on which a plurality of light emitting elements are mounted as light sources, and a lens unit 152 that is attached so as to cover the light source board 151 and controls the light from the light emitting elements to a predetermined light distribution. The light source unit 150 is thermally connected to the base portion 111 that serves as an attachment member. The lens unit 152 is provided with a plurality of lenses according to the light emitting elements.

[0024] (Cover part 160) The cover part 160 transmits the light of the light source part 150. The cover part 160 includes a cover 161 attached to the base part 111 so as to cover the light source part 150, and a cover packing 162 sandwiched between the cover 161 and the base part 111. The cover 161 has a main cover 1611 in a box shape with one side open, and a cover flange part 1612 provided so as to project from the edge of the opening of the main cover 1611. The cover packing 162 has an opening at the center and is provided so as to be pressed between the cover flange part 1612 and the base part 111.

[0025] ● Figures 5 to 8 The connecting part 130 and the reinforcing part 140 will be described with reference to Figures 5 to 8. Figure 5 is a perspective view of the connecting part 130. Figure 6 is a perspective view of the reinforcing part 140. Figure 7 is a reference view for attaching the reinforcing part 140 to the heat sink 110. Figure 8 is a reference view for attaching the connecting part 130 to the heat sink 110.

[0026] (Connecting part 130) The connecting part 130 has a rectangular shape, the lateral width is L, and the height is the same as or substantially the same as the height of the heat sink 110. The connecting part 130 has a rectangular connecting main part 131 having a connecting opening 1311, a top plate side projecting part 132 projecting from the upper side of the connecting main part 131, a base side projecting part 133 projecting from the lower side of the connecting main part 131, and a pair of side projecting parts 134 projecting from both side edges of the connecting main part 131.

[0027] The connecting main part 131 has a window frame shape. The connecting main part 131 is a flat plate and has a connecting opening 1311, a column part 1312, a central pressing part 1313 serving as a holding part, a frame side part 1314, a frame lower part 1315, and a frame upper part 1316. The connecting opening 1311 is provided so as not to obstruct the heat dissipation of the fin part 112 (not to obstruct the entry and exit of air).

[0028] The column portion 1312 is provided with a connection hole 13121 for connecting the arm 10 with a fixture such as a screw.

[0029] The central pressing portion 1313, together with the base-side protruding portion 133, is a holding portion that sandwiches and holds the cover flange portion 1612, the cover packing 162, and the base portion 111. The central pressing portion 1313 has a holding hole portion 13131 into which a cover fixture 169 such as a screw is screwed and fixed.

[0030] The top plate-side protruding portion 132 has a rectangular shape, a lateral width of L, a depth of R, and abuts on the side (lower surface side) of the fin portion 112 of the top plate portion 113 to hold the heat sink 110.

[0031] The base-side protruding portion 133 has a rectangular shape, a lateral width of L, a depth of R at both ends, and a depth of R or more at the center, and abuts on the cover flange portion 1612 of the cover portion 160 to hold the cover portion 160.

[0032] The side protruding portion 134 has a rectangular shape, an upper depth of R, and the depth gradually increases toward the lower part, and the depth of the lowermost part is 2R or more. The side protruding portion 134 has a side pressing portion 1341 that abuts on the reinforcing portion 140 to improve the strength of the connecting portion 130. The side pressing portion 1341 has a pressing notch portion 13411 that abuts on a hole cylinder portion 141 described later. The pressing notch portion 13411 is a semi-circular or C-shaped notch with an opening in the inner direction perpendicular to the connecting main portion 131. The height of the lower frame portion 1315 and the upper frame portion 1316 is the same. The distance between the central pressing portion 1313 and the base-side protruding portion 133 is the same as the height of the lower frame portion 1315 and the same as the combined thickness of the cover flange portion 1612 and the base portion 111.

[0033] (Reinforcing portion 140) The reinforcing portion 140 has a U-shaped cross-section and a lateral width of M. The reinforcing part 140 has an upper plate 147, a back plate 148, and a lower plate 149. The reinforcing part 140 is attached to the base part 111 so as to sandwich the cover flange part 1612, the cover packing 162, and the base part 111.

[0034] The distance between the upper plate 147 and the lower plate 149 is the length obtained by adding the thicknesses of the cover flange part 1612 and the base part 111.

[0035] The reinforcing part 140 is provided with a hole cylinder part 141 and a reinforcing hole part 142 so as to be fixed to the base part 111 together with the cover part 160 and the like by a cover fixture 169 such as a screw. The reinforcing part 140 has an inclined part 143 at its tip, which makes it easier to insert. By attaching the reinforcing part 140 to the base part 111, the rigidity of the base part 111 is improved, and the rigidity of the heat sink 110 is also improved. The reinforcing part 140 has a function and effect like a beam, and by being provided between the two connecting parts 130, the deflection of the heat sink 110 is suppressed.

[0036] ● Figures 9 and 10 The case part 123 of the power supply unit 120 will be described with reference to FIGS. 9 and 10. FIG. 9 is an exploded perspective view of the case part 123. FIG. 10 is a cross-sectional view taken along line B-B shown in FIG. 2 of the case part 123.

[0037] The case part 123 has a case main body 1231, a case packing 1232, and a bush 1233. The case main body 1231 is formed by pressing a plate-shaped metal member in one direction (direction C in FIG. 9), and includes a main case part 12311 having a box shape with one side open, a stepped part 12312 for accommodating the case packing 1232, and a case flange part 12313 that abuts against the top plate part 113 and is fixed by a case fixture 129 such as a screw, which are integrally formed.

[0038] The case packing 1232 is formed of a resin member having elastic performance such as rubber, and is pressed and housed between the stepped portion 12312 and the top plate portion 113. By being pressed and housed, the case packing 1232 can improve the sealing performance inside the case body 1231 and prevent the intrusion of water or the like.

[0039] The case body 1231 can be made thinner and lighter in thickness than by casting, and can reduce the weight of the lighting fixture 1. Also, the reduced rigidity can be compensated by providing a plurality of steps (the steps formed by the main case portion 12311, the stepped portion 12312, and the case flange portion 12313).

[0040] Also, when forming the case body 1231 by bending a cross-shaped plate-like metal, the ends of the bent plates are not connected. Therefore, a gap is formed, and there is a risk of water or the like intruding from there. Also, when a load is applied, there is a risk of deformation from these unconnected ends, but by being integrally formed, such concerns can be suppressed.

[0041] Also, the case flange portion 12313 is provided around the entire circumference of the stepped portion 12312, can press the case packing 1232 around the entire circumference, and can further ensure the sealing performance.

[0042] ● Figures 11 and 12 Using Figures 11 and 12, the fixture mounting bracket 200 for fixing the lighting fixture 1 to the mounting portion will be described.

[0043] (a) of Figure 11 is a perspective view of the fixture mounting bracket 200. Figure 12 is a view showing a state where the lighting fixture 1 is attached to the fixture mounting bracket 200 of (a) in Figure 11. The fixture mounting bracket 200 is used to attach the lighting fixture 1 to a mounting portion 900 having a vertical surface such as a wall.

[0044] The fixture mounting bracket 200 in Fig. 11(a) includes a fixture mounting portion 210 to which the lighting fixture 1 is attached, a bracket leg portion 220 for fixing the fixture mounting bracket 200 to the mounting portion, a bracket belly portion 230, and a bracket waist portion 240.

[0045] The bracket leg portions 220 are on both sides of the fixture mounting bracket 200 and have a wall mounting portion 221 and a side surface portion 222. The wall mounting portion 221 is a flat plate portion fixed to the vertical surface of the mounting portion 900 by a bracket fixture 901 such as a screw. The side surface portion 222 is a right-angled triangular plate portion orthogonal to the wall mounting portion 221 and has a curved portion 223 on the hypotenuse.

[0046] The bracket waist portion 240 is a rectangular flat plate portion having a pair of side surface portions 222 at both ends. The bracket waist portion 240 has a wire hole 241 for passing a wire at the center. The bracket belly portion 230 is a rectangular flat plate portion orthogonal to the bracket waist portion 240. The fixture mounting portion 210 is a rectangular flat plate portion intersecting the bracket belly portion 230 at an obtuse angle.

[0047] In Fig. 12, the fixture mounting portion 210 intersects the bracket belly portion 230 at an angle of 150 degrees, and the fixture mounting portion 210 is attached with the arm 10 inclined 30 degrees with respect to the horizontal plane. The arm 10 is attached at an angle of 60 degrees with respect to the vertical plane.

[0048] The fixture mounting portion 210 is provided with a fixture fixing hole 211 for attaching a fixture such as a bolt for fixing the lighting fixture 1.

[0049] This fixture fixing hole 211 is provided such that two openings with different sizes are continuous, with the hole having a larger width provided on the upper side and the hole having a smaller width provided on the lower side. With the fixture fixing hole 211 having such a shape, after temporarily fixing the bolt 291 and nut 292, which are fixtures, to the mounting hole 11 of the arm 10, the head of the bolt can be inserted into the hole with the larger diameter of the fixture fixing hole 211 and then slid to the hole with the smaller diameter (lower side).

[0050] That is, the bolt head temporarily fixed to the arm 10 can be hooked into the fixture fixing hole 211, and after temporary fixing, the bolt and the nut 292 can be tightened, making the construction easier.

[0051] Also, a gap 250 is formed between the fixture mounting portion 210 and the fitting leg portion 220 when viewed from the side. The presence of this gap 250 allows a tool to be horizontally inserted laterally into the inside of the fixture mounting fitting 200 when fastening the fixture, facilitating the work (the operator does not need to reach behind).

[0052] Note that an arc-shaped curved portion 223 is formed on the side of the fitting leg portion 220 in Fig. 11(a), forming the gap 250 so that the tool can be inserted from the side.

[0053] Also, by having the fitting abdomen 230, even if the fastening of the bolt 291 and the nut 292 loosens and the lighting fixture 1 attempts to move, the head of the bolt interferes with the fitting abdomen 230 and the movement can be suppressed. Fig. 11(b) is a modified example of the fixture mounting fitting 200. The fixture mounting fitting 200 in Fig. 11(b) includes a fixture mounting portion 210 and a fitting leg portion 220. The fixture mounting fitting 200 in Fig. 11(b) has a fitting leg portion 220 in the shape of a right triangle. The side surface portion 222 and the fixture mounting portion 210 are bent and connected at a 90-degree intersection angle at the straight portion 224. A rectangular window 225 is formed in the side surface portion 222, forming the gap 250 so that the tool can be inserted from the side.

[0054] ● Fig. 13 Fig. 13 is a modified example of the case body 1231 of the power supply unit 120, and the case body 1231 may not be box-shaped but may be cylindrical.

[0055] ● Fig. 14 (Convex portion 114 and packing structure of the base portion 111 of the heat sink 110) As shown in FIG. 14, the base portion 111 of the heat sink 110 is plate-shaped. The base portion 111 is made of, for example, an aluminum plate. It may also be made of a metal such as stainless steel or iron instead of aluminum.

[0056] As shown in FIG. 14(a), the base portion 111 has a wiring through-hole 119. The wiring through-hole 119 has a convex portion 114 and a wiring packing 116. The convex portion 114 is a wiring through portion. The convex portion 114 is formed convexly in a direction opposite to the direction in which the light source substrate 151 is installed. The convex portion 114 is provided with a through-hole 115 for passing a wiring 1221 for supplying power from the lighting circuit portion 121 to the light source. The wiring packing 116 is fitted into the through-hole 115 of the convex portion 114.

[0057] The wiring packing 116 prevents the intrusion of water and moisture from the through-hole 115 through which the wiring 1221 passes. The wiring packing 116 is made of silicone rubber or fluororubber, etc. Thus, by disposing the wiring packing 116 on the convex portion 114, water can be stopped. The wiring packing 116 has one or more wiring holes 117 for passing the wiring 1221. The wiring packing 116 passes a wiring 1221 having an outer diameter equal to or larger than the hole diameter of the wiring hole 117 through the wiring hole 117.

[0058] The wiring packing 116 has the same number of wiring holes 117 as the number of wirings 1221, and each wiring hole 117 passes only one wiring. In addition, irregularities are provided inside the wiring hole 117 to prevent the intrusion of water and moisture. Also, the outer shape of the wiring packing 116 is made substantially the same as the inner shape of the convex portion 114 of the base portion 111, so that the gap when the wiring packing 116 is attached to the through-hole 115 of the base portion 111 can be reduced.

[0059] As shown in FIG. 14(b), the wiring-through packing 116 of the wiring-through portion 119 has a protruding portion 118. The protruding portion 118 is a part of the wiring-through packing 116 and is a portion that protrudes from the base portion 111 of the heat sink 110 toward the side where the light source substrate 151 is located. The protruding portion 118 is inserted into the substrate hole 153 of the light source substrate 151. The protruding shape of the protruding portion 118 has a shape corresponding to the substrate hole 153 of the light source substrate 151. In the present embodiment, the protruding shape of the wiring-through packing 116 is an oval convex shape. As shown in FIG. 14(c), the substrate hole 153 of the light source substrate 151 may be an oval or elliptical hole, or may be circular, rectangular, polygonal, or other shapes. As shown in FIGS. 14(d) and (e), instead of the substrate hole 153, the protruding portion 118 may be inserted into a substrate notch portion 154 formed by notching an end portion of the light source substrate 151. The substrate notch portion 154 in FIG. 14(d) is formed by notching the center of one side of the light source substrate 151 in a semicircular shape. The substrate notch portion 154 in FIG. 14(e) is formed by linearly notching the protrusion at the corner of the light source substrate 151.

[0060] By configuring the shape of the wiring-through packing 116 to be thicker than the thickness of the light source substrate 151 with respect to the light source substrate 151, it is possible to connect the wiring 1221 to the connection portion (connector) of the light source substrate 151 without the wiring 1221 touching the edge of the substrate hole 153 of the light source substrate 151. The light source substrate 151 has an oval substrate hole 153 near the outer diameter of the substrate, enabling the wiring 1221 to penetrate therethrough.

[0061] Thereby, it is possible to route the wiring 1221 to the outside without increasing the outer diameter of the substrate of the light source substrate 151, and it is possible to perform the wiring design without increasing the size of the lighting fixture.

[0062] According to the configuration shown in FIG. 14, even if the light source unit 150 and the heat sink 110 are in close contact, a convex portion 114 having a through hole 115 is provided on the side of the base portion 111 opposite to the arrangement surface of the light source unit 150. Therefore, a member such as a waterproof member can be provided in the through hole 115 of the convex portion 114.

[0063] The convex portion 114 of the wiring through portion 119 can be formed at any position of the base portion 111, and the shape of the convex portion 114 is also free.

[0064] In this way, the layout of the wiring through portion 119 can be easily changed. With the light source unit 150 and the heat sink 110 in close contact, the constraints on component arrangement can be eliminated, and the miniaturization of the device can be achieved. That is, it is possible to route the wiring without increasing the device size and to provide a waterproof structure.

[0065] Further, the through hole 115 of the convex portion 114 functions as a space between the light source unit 150 and the base portion 111. By providing the through hole 115 (space) between the light source unit 150 and the base portion 111 and arranging a wiring packing 116 serving as a waterproof member in the space between the light source unit 150 and the base portion 111, it is possible to easily ensure waterproof performance.

[0066] That is, according to the configuration shown in FIG. 14, it is possible to route the wiring without increasing the device size and to provide a waterproof structure.

[0067] ● FIG. 15 (Heat sink 110 and sheet 170 of light source substrate 151) The light source unit 150 is disposed on the side of the base portion 111 of the heat sink 110 opposite to the fin portion 112.

[0068] The light source unit 150 is composed of a light source substrate 151, a light source disposed on the light source substrate 151, and a connection portion (connector). The light source substrate 151 is made of aluminum, composite base epoxy resin (CEM3), glass cloth base epoxy resin (FR-4), or paper phenol, etc. When heat dissipation performance is required, the light source substrate 151 is preferably made of aluminum.

[0069] On the other hand, when the light source substrate 151 is made of aluminum, in order to ensure insulation performance, it is preferable to provide an insulator between the base portion 111 of the heat sink 110 and the light source substrate 151.

[0070] In this case, it is preferable to dispose a heat dissipation sheet having insulation performance.

[0071] When heat dissipation ability is not required, an insulating sheet such as a polyethylene terephthalate (PET) sheet or a polycarbonate (PC) sheet may be disposed. Generally, since the heat dissipation sheet is manufactured by blending various materials, it is more expensive than the insulating sheet.

[0072] As shown in FIG. 15, the sheet 170 of the present embodiment uses two types of sheets: a heat dissipation sheet 171 that serves as a heat conduction sheet and an insulating sheet 172. FIG. 15 is a schematic diagram, and shows an enlarged view of the thicknesses of the heat dissipation sheet 171 and the insulating sheet 172.

[0073] As shown in FIG. 15(a), all of one of the two types of sheets and all of the other sheet may be overlapped. In order to ensure an insulation distance from the outer contour of the light source substrate 151 to the heat sink 110, the sheet 170 is provided with a heat dissipation sheet 171 having substantially the same shape as the light source substrate 151 and an insulating sheet 172 that overlaps the heat dissipation sheet 171 when viewed from the light emitting surface of the light source portion.

[0074] As shown in FIG. 15(b), the insulating sheet 172 may be formed in an annular shape, a ring shape, or a circular shape so that all of one of the two types of sheets and a part of the other sheet overlap. Since the insulating sheet 172 has a lower thermal conductivity than the heat dissipation sheet 171, it is preferable that the portion overlapping the heat dissipation sheet 171 be as small as possible. Therefore, the insulating sheet 172 preferably has a substantially ring shape with an opening in the center.

[0075] As shown in Fig. 15(c), the insulating sheet 172 may be formed in an annular, ring-shaped, or circular shape such that a part of one of the two sheets overlaps a part of the other sheet. At least a part of the insulating sheet 172, that is, the inner edge portion of the insulating sheet 172, overlaps at least a part of the heat dissipation sheet 171, that is, the outer edge portion of the heat dissipation sheet 171. At least a part of the insulating sheet 172, that is, the outer edge portion of the insulating sheet 172, is disposed outside the heat dissipation sheet 171 without overlapping the heat dissipation sheet 171.

[0076] As shown in Fig. 15(d), the heat dissipation sheet 171 having insulation properties may be formed in a circular shape smaller than the light source substrate 151, and the insulating sheet 172 may be formed in an annular, ring-shaped, or circular shape, and the insulating sheet 172 may be disposed outside the heat dissipation sheet 171 without overlapping the heat dissipation sheet 171. An insulation distance from the outer contour of the light source substrate 151 to the heat sink 110 can be ensured.

[0077] If there is a gap at the boundary between the heat dissipation sheet 171 and the insulating sheet 172, an electric circuit may be formed through the gap. Therefore, by ensuring a predetermined distance (required insulation distance) by increasing the thickness of the sheet or overlapping the sheets, it is possible to ensure insulation performance.

[0078] The sheet 170 in Fig. 15 achieves both heat dissipation performance and insulation performance without increasing costs by using two types of sheets. According to the configuration of FIG. 15, it is possible to secure the insulation distance from the substrate end while ensuring the heat dissipation performance. Further, by disposing the insulating sheet 172 while reducing the size of the heat dissipation sheet 171 having insulating performance, the insulation distance can be secured, which is also effective as a surge countermeasure, and it is possible to secure a predetermined insulating performance with an inexpensive configuration.

[0079] ● FIG. 16 (Configuration of Cover Portion 160 / Film Insert) A cover portion 160 for protecting the light source is disposed on the light source side of the base portion 111 of the heat sink 110. The cover portion 160 is composed of a resin such as PC or polymethyl methacrylate resin (PMMA), or a metallic member such as aluminum die-cast and glass. The material of the cover portion 160 can be appropriately changed according to the use environment.

[0080] For example, in a high-temperature environment or an environment with oil, when the cover portion 160 is made of a resin such as PC or PMMA, melting, deterioration, and cracking may occur in the resin due to the heat resistance temperature or the oil attack property. It is preferable to configure the cover portion 160 with a metallic member and an inorganic material such as glass.

[0081] On the other hand, when a metallic member and glass are used for the cover portion 160, the specific gravity is heavier than that of the resin, so the product weight increases, and it is difficult to form the shape integrally like the resin. There are problems such as deterioration of assemblability and increase in cost due to an increase in the number of parts.

[0082] Therefore, as shown in FIG. 16(a), in the present embodiment, the cover 161 of the cover portion 160 is composed of a main body portion 1601 and a film 1602. When the main body portion 1601 of the cover 161 of the cover portion 160 is made of a resin such as PC or PMMA, a resin film 1602 made of a material other than PC or PMMA is integrally molded on the entire outer surface of the main body portion 1601. By integrally molding the resin film 1602 over the entire outer surface of the main body 1601, it becomes possible to complement the weak portions of the main resin that constitutes the cover portion 160.

[0083] For example, by using a film 1602 made of a material such as PET or polyethylene naphthalate (PEN), even in an environment where various chemical substances such as oil or chemicals are present and it is difficult to use PC or PMMA, due to the barrier property of the film 1602 integrally molded on the outer periphery, it becomes possible to use the resin cover portion 160 without affecting the main resin. Specifically, since polycarbonate is weak against oil, a film that is strong against oil is disposed on the outside.

[0084] The cover 161 may be provided with different types of films 1602 according to the outer peripheral portions. Different types of films include heat-resistant films, oil-resistant films, reinforcement films, polarizing films, diffusion films, color films, reflective films, and the like. As shown in FIGS. 16(a), (b), and (c), the cover 161 is provided with different types of films 1602, 1603, and 1604 on the lower surface of the main body 1601, the side surface of the main body 1601, and the lower surface of the cover flange portion 1612. As shown in FIG. 16(d), films 1602 and 1603 may be provided on the lower surface and the upper surface of the main body 1601 of the cover 161. As shown in FIG. 16(e), two or more different types of films 1602 and 1603 may be provided on the lower surface of the main body 1601 of the cover 161 in a full-surface layered or partially layered manner.

[0085] Specifically, the following configurations and their combinations are conceivable. · A reinforcement film is provided on the inner surface, outer surface, or both surfaces of the cover flange portion 1612. · A reinforcement film is provided at the corner of the main cover. · A reinforcement film is provided on the lower surface of the main cover. · A reinforcement film is provided on the side surface of the main cover. · A reflective film is provided on the side surface of the main cover. · Dispose a heat-resistant film or an oil-resistant film on the outer surface of the main cover. · Dispose a polarizing film, a diffusion film, or a color film on the inner surface of the main cover. According to the configuration of FIG. 16, since different types of films are disposed at the portions of the cover 161, it is possible to provide protection according to the portions of the cover 161.

[0086] By imparting optical performance to the film 1602, it is possible to provide a function of changing the direction of light, and it is also possible to provide a light distribution control function at the same time. Examples of the method of imparting optical performance to the film 1602 include blending a diffusing material, or a pigment or a dye into the film 1602, light distribution control by arranging a geometric pattern, and changing a cross-sectional shape.

[0087] As a result, it is possible to easily ensure the performance according to the use of the lighting fixture without changing the main resin of the cover portion 160 by changing the film 1602.

[0088] In addition, in the present embodiment, although the lens of the lens portion 152 is arranged on the light source of the light source substrate 151, the lens may be integrally formed on the inner surface of the main body portion 1601 of the cover portion 160.

[0089] According to the configuration of FIG. 16, it is possible to complement the weak physical properties of the basic resin by disposing the film on the outer contour of the molded product without performing coating or two-color (multi-color) molding.

[0090] ● FIG. 2 (Waterproofing by the heat sink 110 and the packing of the cover portion 160) As shown in FIG. 2, the cover 161 has a main cover 1611 that covers the light source portion 150 and a cover flange portion 1612 that is fixed to the base portion.

[0091] The cover packing 162 is a water-stop member that is closely fixed to the cover flange portion 1612 and the base portion 111. The cover packing 162 is a packing for water stop having an annular shape along the cover flange portion 1612.

[0092] The base portion 111 and the cover portion 160 of the heat sink 110 are fixed by a cover fixture 169, which is a fastening member such as a screw, and a reinforcing portion 140. In the case where there is no cover packing 162, the cover fixture 169 fixes the cover 161 to the base portion 111. Note that the base portion 111 and the cover portion 160 are fixed by the cover fixture 169, and the reinforcing portion 140 may not be provided for fixing the base portion 111 and the cover portion 160.

[0093] In the case where there is a cover packing 162, the cover fixture 169 fixes the cover 161 to the base portion 111 by bringing the cover packing 162 into close contact between the base portion 111 and the cover 161.

[0094] Normally, when the lighting fixture is used indoors, there is no particular problem with the configuration of fixing with a fastening member such as a screw. However, when the lighting fixture is used under the eaves or on the roof side, etc., since there is intrusion of water or moisture due to rainfall, etc., if there is a gap between parts, there is concern about insulation failure due to water immersion or rusting of parts.

[0095] Therefore, in the present embodiment, by disposing a cover packing 162 having a shape along the shape of the portion where the cover portion 160 contacts the base portion 111 of the heat sink 110 between the base portion 111 (plate-shaped mounting member) of the heat sink 110 and the cover portion 160, intrusion of water and moisture is prevented. The cover packing 162 is made of silicone rubber or fluororubber.

[0096] A water stop member is sandwiched between either the contact surface between the head of the screw and the base portion 111 or the contact surface between the head of the screw and the cover 161. The base portion 111 of the heat sink 110, the cover packing 162, and the cover portion 160 are fixed by a cover fixture 169 such as a screw. However, if the screw is used as it is, intrusion of water or moisture through the gap at the tip or head of the screw is conceivable.

[0097] Therefore, it is desirable to dispose a water stop washer (a washer made of metal or resin with a water stop member such as rubber integrated on one side) on the screw head side.

[0098] Also, a water stop member is disposed at the tip of the screw (screw tip). In addition to the water stop washer on the screw head side, it is desirable to dispose a water stop washer and a socket nut or the like on the screw tip side. Alternatively, by previously press-fitting a caulking nut or the like into the base portion 111 of the heat sink 110, the processing on the screw tip side may be made unnecessary.

[0099] According to the configuration of FIG. 2, the cover fixture 169 and the reinforcing portion 140 fix the base portion 111 and the cover 161 regardless of the presence or absence of the cover packing 162, so that it is possible to configure an instrument that requires waterproof performance without changing the structure of the lighting fixture.

[0100] Also, according to the configuration of FIG. 2, even when there is an increase or decrease in the light source portion, it is possible to configure an instrument that does not require waterproof performance and an instrument that requires waterproof performance only by the presence or absence of one cover packing 162 (one waterproof member) without changing the structure of the lighting fixture.

[0101] Also, according to the configuration of FIG. 2, it is possible to share general non-waterproof instruments and parts and impart waterproof performance by adding only one cover packing 162.

[0102] ● FIGS. 6 and 7 (Reinforcing portion 140 for suppressing deformation of base portion 111 of heat sink 110) When a waterproof structure is achieved by sandwiching the cover packing 162 between the base portion 111 (plate-shaped mounting member) of the heat sink 110 and the cover portion 160, if the base portion 111 of the heat sink 110 is made of a plate material such as sheet metal and is directly fixed with a fixing member such as a screw, the base portion 111 of the heat sink 110 may be deformed by sandwiching (while crushing) the cover packing 162.

[0103] Therefore, as shown in FIG. 6, in the present embodiment, in addition to the base portion 111 of the heat sink 110, the cover packing 162, and the cover portion 160, a reinforcing member for preventing deformation of the base portion 111 of the heat sink 110 is provided as the reinforcing portion 140.

[0104] The reinforcing member is installed to increase the rigidity of the end portion (outer peripheral surface) of the base portion 111 of the heat sink 110. Examples of methods for increasing the rigidity of the base portion 111 include the following configurations. (1) Increase the plate thickness of the base portion 111. (2) Fix a U-shaped component to the end cross-section of the base portion 111 to increase the section modulus. (3) Fix an L-shaped component to the end cross-section of the base portion 111 to increase the section modulus.

[0105] When increasing the plate thickness in (1), examples of the following configurations include. (1-1) Increase the plate thickness of the entire base portion 111. (1-2) Fix a ring plate having the same outer peripheral shape as the outer peripheral shape of the base portion 111 to the outer edge of the base portion 111.

[0106] When making the cross-section in (2) U-shaped, attach a reinforcing portion 140 with a U-shaped cross-section. The U-shaped reinforcing portion 140 is arranged so as to sandwich the cover portion 160, the cover packing 162, and the base portion 111.

[0107] Hereinafter, the reinforcing portion 140 will be described with reference to FIG. 6. The reinforcing portion 140 is fixed to the edge of the base portion 111. The reinforcing portion 140 is an individual component having a substantially U-shaped cross-section and sandwiches the base portion 111 and the cover 161. Alternatively, the reinforcing portion 140 sandwiches the base portion 111, the cover packing 162, and the cover 161.

[0108] The reinforcing portion 140 has an upper plate 147, a back plate 148, and a lower plate 149. The upper plate 147 has three hole cylinders 141 at both ends and in the center. The hole cylinder 141 protrudes cylindrically from the upper surface of the upper plate 147, and screw threads for fitting a cover fixture 169 such as a screw are formed on the inner wall. The lower plate 149 has three reinforcing holes 142 at both ends and in the center. The reinforcing hole 142 is a through hole through which a cover fixture 169 such as a screw passes. The upper plate 147 has a concave portion 1471 in the center that is recessed toward the back plate 148. The concave portion 1471 is recessed in an arc shape so as not to interfere with the circular outer periphery of the fin portion 112. On both sides of the reinforcing hole 142 in the center of the concave portion 1471, there are cut portions 1472 so as not to interfere with the outer ends of the fin portions 112 arranged on both sides of the reinforcing hole 142. The lower plate 149 has a concave portion 1481 in the center that is recessed toward the back plate 148. The concave portion 1481 is recessed in a trapezoidal shape so as not to interfere with the outer periphery of the hem of the main cover 1611 of the cover portion 160. Since the circular outer periphery of the fin portion 112 bulges outward more than the outer periphery of the hem of the main cover 1611, the amount of concavity of the concave portion 1471 is larger than the amount of concavity of the concave portion 1481.

[0109] The hole cylinder 141 in the center and the reinforcing hole 142 in the center are formed at positions closer to the back plate 148 than the two hole cylinders 141 and the two reinforcing holes 142 on both sides. The upper plate 147 has five inclined portions 143 formed parallel to the back plate 148. The lower plate 149 has four inclined portions 143 formed parallel to the back plate 148. Except for both ends of the upper plate 147, inclined portions 143 are arranged on all sides parallel to the back plate 148 between the upper plate 147 and the lower plate 149. Since side pressing portions 1341 rest on both ends of the upper plate 147, there are no inclined portions 143 at both ends of the upper plate 147. Since both ends of the lower plate 149 do not interfere with the base-side protruding portion 133, inclined portions 143 exist at both ends of the lower plate 149.

[0110] (Mounting method of the reinforcing portion 140) As shown in Fig. 7, insert the reinforcing portion 140 laterally so as to sandwich the cover flange portion 1612, the cover packing 162, and the base portion 111, and fix it with the cover fixture 169 to the straight portion of the base portion 111.

[0111] At this time, the reinforcing portion 140 is inserted so as to press the cover packing 162. Since the reinforcing portion 140 has the inclined portion 143, it is easy to insert. The reinforcing portion 140 has a width of M, the length of the base portion 111 is L, and the ends of the reinforcing portion 140 are each separated by R from the side perpendicular to the side to which the reinforcing portion 140 is attached.

[0112] (Mounting method of the connecting portion 130) As shown in Fig. 8, attach the connecting portion 130 by inserting it laterally from the side of the heat sink 110. The distance between the central pressing portion 1313 and the base-side protruding portion 133 is smaller by the thickness of the upper plate 147 of the reinforcing portion 140 than the distance between the side pressing portion 1341 and the base-side protruding portion 133.

[0113] The relationship of each part at the time of attachment is as follows. · The top-plate-side protruding portion 132 abuts on the side (lower surface side) where the fin portion 112 of the top plate portion 113 is located. · The base-side protruding portion 133 abuts on the cover flange portion 1612. Since the base-side protruding portion 133 has a depth of R, the base-side protruding portion 133 does not collide with the lower plate 149 of the reinforcing portion 140. · The central pressing portion 1313, together with the base-side protruding portion 133, sandwiches and holds the cover flange portion 1612 and the cover packing 162. At this time, the cover packing 162 is pressed toward the base portion 111 side. · The side pressing portion 1341, together with the base side protruding portion 133, sandwiches and holds the cover flange portion 1612, the cover packing 162, the base portion 111, and the upper plate 147 of the reinforcing portion 140. At this time, the cover packing 162 is pressed toward the base portion 111 side. · The side pressing portion 1341 abuts on the upper surface of the end portion of the upper plate 147 of the reinforcing portion 140 (not shown in FIG. 8).

[0114] The end portion of the upper plate 147 of the reinforcing portion 140 is separated from the connecting main portion 131 of the connecting portion 130 by R. However, since the depth of the side pressing portion 1341 is 2R or more, the side pressing portion 1341 can be placed on the upper surface of the end portion of the upper plate 147.

[0115] When the side pressing portion 1341 abuts on the reinforcing portion 140, it becomes strong against loads such as shaking or twisting, and the strength of the lighting fixture 1 is improved. Further, by placing the side pressing portion 1341 on the end portion of the upper plate 147 of the reinforcing portion 140 at the corner of the base portion 111, deformation in the diagonal direction of the base portion 111 is suppressed.

[0116] Further, since the pressing notch portion 13411 abuts on the hole cylinder portion 141, it is possible to suppress caught twisting when there is a load such as twisting. Further, the pressing notch portion 13411 abuts on the outer peripheral wall outside the hole cylinder portion 141 to prevent the reinforcing portion 140 from coming off.

[0117] In addition, when the cross section of the reinforcing portion 140 is an L-shaped individual part, the reinforcing portion 140 having an L-shaped cross section is attached. The reinforcing portion 140 having an L-shaped cross section covers the edge and the end surface of the base portion 111.

[0118] By installing an L-shaped metal fitting as a reinforcing member on the base portion 111 of the heat sink 110 and tightening it together with the cover portion 160, the cover packing 162, and the base portion 111 of the heat sink 110, it is possible to suppress deformation of the base portion 111 of the heat sink 110 and enable fixing.

[0119] By attaching reinforcing members such as the reinforcing portion 140 shown in FIG. 6 around the base portion 111, deformation of the base portion 111 can be prevented. The reinforcing portion 140 shown in FIG. 6 suppresses deformation of the plate-shaped base portion 111, and by sandwiching the cover packing 162, it is possible to reduce the weight of the device while ensuring waterproof performance. Also, when the reinforcing portion 140 is made of a metal such as aluminum or iron, and the cover 161 is made of a metal (aluminum die-cast material) such as aluminum die-cast, a heat dissipation effect can be expected. That is, the heat of the heat sink 110 can be transmitted to the aluminum die-cast cover 161 via the reinforcing portion 140.

[0120] ● FIG. 17 (Suppressing deformation of the base portion 111 of the heat sink 110) The peripheral end of the base portion 111 is bent at 90 degrees to form an outer peripheral edge with an L-shaped cross section on the base portion 111. As a method of increasing the rigidity of the base portion 111 of the heat sink 110 without using a reinforcing member, as shown in FIG. 17, it is conceivable to bend the end portion of the base portion 111 of the heat sink 110.

[0121] The base portion 111 has a circular light source fixing portion 1112 with the light source portion 150 fixed to the lower surface, and a bent portion 1111 bent downward from the outer end portion of the light source fixing portion 1112. The bent portion 1111 is formed by bending the entire side of the base portion 111 along a bending line that is a straight line parallel to the side of the base portion 111. The top plate portion 113 has a circular fin fixing portion 1132 with the fin portion 112 fixed to the lower surface, and a bent portion 1131 bent downward from the outer end portion of the fin fixing portion 1132. The bent portion 1131 is formed by bending the entire side of the top plate portion 113 along a bending line that is a straight line parallel to the side of the top plate portion 113.

[0122] In Fig. 17(a), the bent portion 1111 is bent 90 degrees downward from the end of the light source fixing portion 1112. Similarly, the bent portion 1131 is bent 90 degrees downward from the end of the fin fixing portion 1132.

[0123] In Fig. 17(b), the bent portion 1111 is bent downward at an angle greater than 90 degrees and less than or equal to 180 degrees from the end of the light source fixing portion 1112. Similarly, the bent portion 1131 is bent downward at an angle greater than 90 degrees and less than or equal to 180 degrees from the end of the fin fixing portion 1132.

[0124] A bent portion may be formed on only one of the base portion 111 and the top plate portion 113. That is, a bent portion may be formed on at least one of the base portion 111 and the top plate portion 113. The bent portion 1111 and the bent portion 1131 are formed on a pair of opposite sides where the connecting portion 130 is not fixed. In the present embodiment, the base portion 111 and the top plate portion 113 are rectangular, the connecting portion 130 is fixed to two opposite sides of the rectangle, and bent portions are formed on the remaining two opposite sides of the rectangle.

[0125] When a reinforcing member is added, it is necessary to increase the number of parts. However, when bending the base portion 111 of the heat sink 110, it is possible to increase the rigidity without changing the number of parts.

[0126] In the case of an appliance having waterproof performance, it is assumed that water will directly hit the appliance. Therefore, if water stays inside the appliance, it will cause rust or water ingress. Therefore, as shown in Figs. 25 and 28, it is preferable that the bending direction of the bent portion 1111 at the end of the base portion 111 of the heat sink 110 is opposite to the direction of the fin portion 112 of the heat sink 110.

[0127] When bent in the same direction as the fin portion 112 of the heat sink 110, the base portion 111 of the heat sink 110 becomes a tray shape and water will accumulate. By bending in the direction opposite to the fin portion 112 of the heat sink 110, even when water is applied to the heat sink 110, the water does not stagnate and flows away, achieving an effect. Even in an instrument without a packing, bending the end portion of the base portion 111 of the heat sink 110 is effective as a method of increasing the rigidity of the base portion 111 of the heat sink 110. If the rigidity of the base portion 111 of the heat sink 110 is increased, it becomes possible to directly fix the ceiling mounting arm 10 to the base portion 111 of the heat sink 110.

[0128] The same applies to the top plate portion 113 as to the base portion 111. According to the configuration of FIG. 17, by providing a bent portion on each side surface of the base portion 111 or the top plate portion 113 of the heat sink 110, deformation can be suppressed. When a packing or the like is tightened on the base portion 111 or the top plate portion 113, deformation of the base portion 111 or the top plate portion 113 and the packing or the like can be suppressed.

[0129] FIG. 18 is a diagram showing a modified example of the bent portion 1131 of the top plate portion 113. (a) shows that the bent portion 1131 of the top plate portion 113 is bent 90 degrees downward to form an L-shaped cross-sectional shape perpendicular to the side of the base portion 111. The top plate side protruding portion 132 of the connecting portion 130 is placed on the top plate portion 113, and the bent portion 1131 is placed inside the connecting main portion 131 of the connecting portion 130, and the bent portion 1131 and the connecting main portion 131 are fixed with a top plate fixture 137 such as a screw.

[0130] (b) shows that the bent portion 1131 of the top plate portion 113 is bent 90 degrees downward to form an L-shaped cross-sectional shape perpendicular to the side of the base portion 111. The top plate side protruding portion 132 of the connecting portion 130 is placed under the top plate portion 113, and the bent portion 1131 is placed outside the connecting main portion 131 of the connecting portion 130, and the top plate side protruding portion 132 and the top plate portion 113 are fixed with a top plate fixture 137 such as a screw.

[0131] (c) eliminates the top plate side protruding portion 132 from the connecting portion 130, bends the bent portion 1131 of the top plate portion 113 downward by 90 degrees to make the cross-sectional shape orthogonal to the side of the base portion 111 into an L shape, places the bent portion 1131 inside the connecting main portion 131 of the connecting portion 130, and fixes the bent portion 1131 and the connecting main portion 131 with a top plate fixture 137 such as a screw.

[0132] (d) eliminates the top plate side protruding portion 132 from the connecting portion 130, bends the bent portion 1131 of the top plate portion 113 downward by 90 degrees to make it L-shaped, places the bent portion 1131 outside the connecting main portion 131 of the connecting portion 130, and fixes the bent portion 1131 and the connecting main portion 131 with a top plate fixture 137 such as a screw.

[0133] (e) bends the bent portion 1131 of the top plate portion 113 by 180 degrees to make the cross-sectional shape orthogonal to the side of the base portion 111 into a U shape, places the bent portion 1131 on the top plate side protruding portion 132 of the connecting portion 130, and fixes the top plate portion 113, the bent portion 1131, and the top plate side protruding portion 132 with a top plate fixture 137 such as a screw.

[0134] (f) bends the bent portion 1131 of the top plate portion 113 by 180 degrees to make the cross-sectional shape orthogonal to the side of the base portion 111 into a U shape, places the bent portion 1131 under the top plate side protruding portion 132 of the connecting portion 130, and fixes the top plate portion 113, the bent portion 1131, and the top plate side protruding portion 132 with a top plate fixture 137 such as a screw.

[0135] (c) and (d) configurations have no components protruding from the upper surface of the top plate portion 113. (b) and (e) configurations have the components protruding from the upper surface of the top plate portion 113 being only the screw heads of the top plate fixtures 137.

[0136] Figure 19 is a diagram showing a modified example of the bent portion 1111 of the base portion 111. (a) shows that the bent portion 1111 of the base portion 111 is bent 90 degrees downward to form an L-shaped cross-sectional shape perpendicular to the side of the base portion 111. The bent portion 1111 is placed outside the cover flange portion 1612. The base-side protruding portion 133 of the connecting portion 130 is placed below the lower tip of the bent portion 1111. The bent portion 1111 is placed inside the connecting main portion 131 of the connecting portion 130. The center pressing portion 1313 and the base-side protruding portion 133 are fixed with a cover fixture 169 such as a screw, sandwiching the cover flange portion 1612 and the base portion 111.

[0137] (b) shows that the bent portion 1111 of the base portion 111 is bent 90 degrees twice to form a U-shaped cross-sectional shape perpendicular to the side of the base portion 111. The cover flange portion 1612 is closely arranged in the concave portion of the U-shape of the bent portion 1111. The bent portion 1111 is placed inside the connecting main portion 131 of the connecting portion 130. The center pressing portion 1313 and the base-side protruding portion 133 are fixed with a cover fixture 169 such as a screw, sandwiching the cover flange portion 1612, the base portion 111, and the base portion 111.

[0138] (c) shows that the bent portion 1111 of the base portion 111 is bent 180 degrees to form a U-shaped cross-sectional shape perpendicular to the side of the base portion 111. The bent portion 1111 is placed outside the cover flange portion 1612. The bent portion 1111 is placed inside the connecting main portion 131 of the connecting portion 130. The center pressing portion 1313 and the base-side protruding portion 133 are fixed with a cover fixture 169 such as a screw, sandwiching the cover flange portion 1612 and the base portion 111. Although not shown, in the portion without the center pressing portion 1313, the base portion 111 and the base-side protruding portion 133 may be fixed with a cover fixture 169 such as a screw, sandwiching the cover flange portion 1612.

[0139] ● Figures 9 and 10 (Stripping structure of the power supply case) The lighting fixture 1 has a lighting circuit portion 121 and a case portion 123 that covers the lighting circuit portion 121. In the present embodiment, the lighting circuit portion 121 and the case portion 123 are installed on the top plate portion 113 disposed on the upper portion of the heat sink 110.

[0140] The lighting circuit unit 121 and the case unit 123 may be directly installed on the base unit 111 of the heat sink 110 instead of on the top plate unit 113, or may be attached to the ceiling mounting arm 10. Further, a space may be opened on the fin unit 112 of the heat sink 110 and attached across the left and right of the arm 10. The case unit 123 has a function of protecting the lighting circuit unit 121. Specifically, it has functions such as preventing direct contact with the power supply board 1222, preventing dust accumulation, and ensuring insulation performance.

[0141] Generally, when making a box-shaped case unit 123 from sheet metal, a box shape is formed by bending from a substantially cross-shaped developed shape. In that case, gaps will be formed at the ridges (joint parts) of each bent and raised surface. If there are gaps, there is a risk of the aforementioned dust accumulation or the risk of touching the substrate. Therefore, it is possible to solve the above problems by welding the ridges (joint parts), but in the case of welding, the processing takes time, and it is necessary to confirm whether the welding can be done without gaps.

[0142] In the present embodiment, in order to solve the above problems, a single sheet material (sheet metal) is drawn (deep drawn) to form a box-shaped (cylindrical) case unit 123 without gaps. The drawing process can be carried out by press working or the like. The box shape is formed by being pushed from one direction and has an open shape on one side.

[0143] The case unit 123 houses the lighting circuit unit 121 in a recess without seams formed by a single metal plate. The case unit 123 has a recessed main case unit 12311 having an opening, a stepped portion 12312 formed around the opening, and a case flange portion 12313 formed around the stepped portion 12312. The stepped portion 12312 is a packing storage portion for storing the case packing 1232. The stepped portion 12312 is stepped. The stepped portion 12312 has a horizontal ring portion 12314 and a vertical band portion 12315. The horizontal ring portion 12314 is located between the main case portion 12311 and the vertical band portion 12315, and is a rectangular ring portion parallel to the case flange portion 12313. The vertical band portion 12315 is located between the horizontal ring portion 12314 and the case flange portion 12313, and is an annular band portion parallel to the side surface of the main case portion 12311. The case portion 123 is formed by a drawing process of pressing a single metal plate from one direction, and each corner has no sharp angle and all corners exhibit a curved surface.

[0144] When imparting waterproof performance to the case portion 123, it can be easily dealt with by arranging a ring-shaped case packing 1232 on the opening surface side of the case portion 123. The case packing 1232 is arranged on the stepped portion 12312 and is sandwiched between the stepped portion 12312 and the top plate portion 113. The case packing 1232 has a rectangular annular frame, and the cross-section of the frame is rectangular. The outer shape of the case packing 1232 is the same as the inner shape of the vertical band portion 12315. The height of the case packing 1232 is higher than the height of the vertical band portion 12315, but is pressed by the horizontal ring portion 12314 and the case flange portion 12313 to have the same height as the vertical band portion 12315. The case packing 1232 has two annular convex portions 12321 on the lower surface that is in close contact with the upper surface of the top plate portion 113. The annular convex portion 12321 is pressed by the horizontal ring portion 12314 and the top plate portion 113 to deform and improve the water-stopping effect. One or more annular convex portions 12321 are acceptable. The case packing 1232 has two annular ridge portions 12322 on the outer surface that is in close contact with the inner surface of the vertical band portion 12315.

[0145] When the case packing 1232 is pressed and expands outward, the annular ridge portion 12322 is pressed against the inner wall of the vertical band portion 12315 to deform and improve the water-stopping effect. One or more annular ridge portions 12322 are acceptable. The case packing 1232 is preferably made of silicone rubber or fluorine rubber.

[0146] In addition, when fixing the case portion 123 to the top plate portion 113, similar to the base portion 111 of the heat sink 110 described above, the rigidity of the top plate portion 113 can be increased by bending the end portion of the top plate portion 113, and deformation of the top plate portion 113 can be suppressed.

[0147] Also, by setting the bending direction to the direction opposite to that of the case portion 123 (downward direction), it is possible to prevent water from accumulating.

[0148] The case portion 123 shown in FIGS. 9 and 10 is formed by being pushed from one direction and has a power storage portion in the shape of a (cylindrical) box with one surface open. Since there is no butting portion on the side surface of the case portion 123, airtightness can be easily ensured.

[0149] Therefore, there is no gap at each corner portion (each corner) of the case portion 123, and airtightness can be easily ensured without performing post-processing such as welding of ridge lines (butting portions), and it is possible to prevent dust from entering and water from infiltrating.

[0150] Also, since the case fixture 129 fixes the top plate portion 113 and the case portion 123 regardless of the presence or absence of the case packing 1232, it is possible to configure an instrument that requires waterproof performance without changing the structure of the lighting fixture.

[0151] Also, it is possible to configure an instrument that does not require waterproof performance and an instrument that requires waterproof performance only depending on the presence or absence of one case packing 1232 (one waterproof member).

[0152] Also, it is possible to share general instruments and parts that are not waterproof and add only one case packing 1232 to impart waterproof performance.

[0153] ● FIGS. 5 and 8 (Fixing portion 139 of connecting portion 130) A cover portion 160 is fixed to the base portion 111 of the heat sink 110 by a cover fixture 169 which is a fastening member such as a screw. Further, there is a top plate portion 113 on the heat sink 110, and a lighting circuit portion 121 and a case portion 123 are fixed thereon. The base portion 111 and the top plate portion 113 of the heat sink 110 are fixed by a connecting portion 130.

[0154] An arm 10 for ceiling mounting is also fixed to this connecting portion 130. The connecting portion 130 is a fixing metal fitting that fixes the base portion 111, the top plate portion 113, and the cover portion 160. The side protruding portion 134 is a connecting portion extending in the vertical direction. The side protruding portion 134 has a vertically long shape, and the skirt portion at the lower part of the side protruding portion 134 gradually widens as it approaches the base portion 111.

[0155] The top plate side protruding portion 132 is an upper fixing portion for attaching the top plate portion 113. The base side protruding portion 133 is a lower fixing portion that supports and covers the cover portion 160. The side pressing portion 1341 is located between the upper fixing portion and the lower fixing portion, and fixes a screw passing through the base portion 111 of the heat sink 110, and is an intermediate fixing portion that receives the base portion 111 of the heat sink 110.

[0156] The connecting portion 130 connects the base portion 111 and the top plate portion 113, and fixes the cover portion 160 and the base portion 111. The connecting portion 130 has a flat connecting main portion 131 between the top plate portion 113 and the base portion 111. The connecting portion 130 has a fixing portion 139 at the lower part of the connecting portion 130 that sandwiches and fixes the cover portion 160 and the base portion 111.

[0157] The fixing portion 139 is composed of a base side protruding portion 133, a side pressing portion 1341, and a central pressing portion 1313. The base side protruding portion 133 is orthogonal to the connecting main portion 131 at the lower end portion of the connecting main portion 131. The base side protruding portion 133 covers the lower surface of the edge portion of the cover portion 160, that is, the lower surface of the cover flange portion 1612.

[0158] The base-side protruding portion 133 is formed by bending the lower end portion of the connecting main portion 131 by 90 degrees. The side pressing portion 1341 and the central pressing portion 1313 are arranged in parallel with the base-side protruding portion 133 in the middle of the connecting main portion 131.

[0159] The side pressing portion 1341 covers the upper surface of the end portion of the reinforcing portion 140. The central pressing portion 1313 covers the upper surface at the center of the edge portion of the base portion 111. The connecting portion 130 has a side protruding portion 134 orthogonal to the connecting main portion 131 at the side end portion of the connecting main portion 131. The side protruding portion 134 can be formed by bending the side end portion of the connecting main portion 131 by 90 degrees. The side pressing portion 1341 is orthogonal to the side protruding portion 134 below the side protruding portion 134. The side pressing portion 1341 can be formed by bending the lower end portion of the side protruding portion 134 90 degrees inward.

[0160] The side pressing portion 1341 is a plate for pressing the end portion of the base portion 111. The connecting portion 130 has a column portion 1312 at the center of the connecting main portion 131, The central pressing portion 1313 is orthogonal to the column portion 1312 below the column portion 1312. The central pressing portion 1313 can be formed by notching a part below the column portion 1312 into a tongue shape and bending it 90 degrees inward.

[0161] The central pressing portion 1313 is formed at the center in the left-right direction of the connecting portion 130 and protrudes from the connecting main portion 131 by the same length as the width of the base-side protruding portion 133. The side pressing portion 1341 is formed at both ends in the left-right direction of the connecting portion 130 and protrudes from the connecting main portion 131 longer than the base-side protruding portion 133 and the central pressing portion 1313. The base-side protruding portion 133 and the central pressing portion 1313 sandwich the base portion 111 and the cover flange portion 1612. The distance between the base-side protruding portion 133 and the central pressing portion 1313 is the length obtained by adding the thickness of the base portion 111 and the thickness of the cover flange portion 1612.

[0162] The base-side protruding portion 133 and the side pressing portion 1341 sandwich the base portion 111, the cover flange portion 1612, and the upper plate of the reinforcing portion 140. The distance between the base-side protruding portion 133 and the side pressing portion 1341 is the length obtained by adding the thickness of the base portion 111, the thickness of the cover flange portion 1612, and the thickness of the sheet metal of the upper plate 147 of the reinforcing portion 140.

[0163] The side pressing portion 1341 is formed to protrude long inward at both the left and right ends of the connecting portion 130. The side pressing portion 1341 has a pressing notch portion 13411 that overlaps with the end portion of the upper plate 147 of the reinforcing portion 140 and sandwiches the end portion of the upper plate 147 of the reinforcing portion 140, and avoids the hole cylinder portion 141 protruding from the upper plate 147 of the reinforcing portion 140.

[0164] In the present embodiment, a cover packing 162 is disposed between the base portion 111 of the heat sink 110 and the cover portion 160 to impart waterproof performance. In the present embodiment, in order to fix the base portion 111 of the heat sink 110, the cover packing 162, and the cover portion 160 at once, by having a plurality of functions in the connecting portion 130, it is possible to fix various components without increasing the number of parts. Specifically, the cover portion 160, the base portion 111 of the heat sink 110, and the cover packing 162 are fixed with a fastening member such as a screw in a manner of being sandwiched between the base-side protruding portion 133 serving as the lower fixing portion of the connecting portion 130 and the side pressing portion 1341 serving as the intermediate fixing portion. The top plate portion 113 is fixed to the top plate-side protruding portion 132 serving as the upper fixing portion with a fastening member such as a screw. At this time, a hole through which a screw passes is formed in the base-side protruding portion 133 serving as the lower fixing portion, and a screw hole to which a screw can be fastened is provided in the side pressing portion 1341 serving as the intermediate fixing portion. In addition, it is possible to fix an arm 10 for installing a lighting fixture on the ceiling to the column portion 1312 serving as the connecting portion of the connecting portion 130.

[0165] According to the configurations of FIGS. 5 and 8, the fixing portion 139 has a function of fixing a plurality of members. Therefore, it is not necessary to provide an attachment structure for fixing the cover portion 160 to the light source portion 150, and it is possible to securely fix the cover 161 without increasing the number of parts and the man-hours for assembly.

[0166] According to the configurations of FIGS. 5 and 8, by providing the fixing portion 139 in the connecting portion 130 that connects the base portion 111 and the top plate portion 113 of the heat sink 110, it is possible to fix the cover 161 while regulating the dimensions without providing a separate member, and the assembly becomes easier due to the commonization of parts.

[0167] ● FIGS. 5 and 20 (Connecting portion 130 with enhanced vibration resistance performance) The function of the connecting portion 130 is as described above, and mainly includes fixing the base portion 111 and the top plate portion 113 of the heat sink 110 and fixing the arm 10.

[0168] On the other hand, when the appliance specification is such that it is installed in an environment where vibrations such as those from a crane are applied, it is necessary to enhance the vibration resistance performance. Generally, it is necessary to consider vibrations in the horizontal directions (x-direction, y-direction) and the vertical direction (z-direction). When enhancing the vibration resistance performance, it is necessary to consider improving the rigidity in each of the above x, y, and z directions.

[0169] In order to improve the rigidity, it is necessary to improve the rigidity of the connecting portion 130 in the x, y, and z directions, and to increase the number of fixing points between the base portion 111 and the top plate portion 113 of the heat sink 110 and the connecting portion 130 respectively.

[0170] The connecting portion 130 of the present embodiment has a shape with increased strength in the x, y, and z directions. Specifically, as shown in FIG. 5, the connecting portion 130 has the following three types of orthogonal planes. xy plane: Base-side protruding portion 133, top plate-side protruding portion 132, side pressing portion 1341 yz plane: Main connecting portion 131 xz plane: Pair of side protruding portions 134

[0171] The base portion 111 and the top plate portion 113 of the heat sink 110 have substantially the same rectangular shape. The main connecting portion 131 of the connecting portion 130 is a rectangular plate having a side length equal to that of one side of the base portion 111 and the top plate portion 113.

[0172] The connecting portion 130 has a base-side protruding portion 133, a top-plate-side protruding portion 132, and a pair of side protruding portions 134 that are orthogonal to the main connecting portion 131, on four sides of the main connecting portion 131. The base-side protruding portion 133 and the top-plate-side protruding portion 132 are formed by bending the upper and lower portions of the main connecting portion 131 in a 90-degree direction. The side protruding portion 134 is formed by forming a first bending portion on the left and right sides of the main connecting portion 131 and bending it in a 90-degree direction. The side pressing portion 1341 is formed by forming a second bending portion under the side protruding portion 134 and bending it in a 90-degree direction. The side pressing portion 1341 is parallel to the base portion 111 of the heat sink 110.

[0173] The base-side protruding portion 133, the top-plate-side protruding portion 132, the side pressing portion 1341, the main connecting portion 131, and the side protruding portion 134 are orthogonal planes, which increase the rigidity in all directions.

[0174] Although not shown, the side of the frame-side portion 1314 may be bent at 90 degrees to form an xz plane parallel to the side protruding portion 134.

[0175] Also, the lower side of the frame lower portion 1315 and the upper side of the frame upper portion 1316 may be bent at 90 degrees to form an xy plane parallel to the base-side protruding portion 133 and the top-plate-side protruding portion 132.

[0176] In the xy plane formed by bending the lower side of the frame lower portion 1315 and the upper side of the frame upper portion 1316, a recessed portion is formed in the same manner as the upper plate of the reinforcing portion 140. In the xy plane formed by bending the lower side of the frame lower portion 1315, an inclined portion is formed in the same manner as the upper plate of the reinforcing portion 140.

[0177] As shown in FIG. 20, in the present embodiment, the connecting main portion 131 widened in the width direction of the connecting portion 130 is provided with a plurality of hole portions 138 serving as meat-stealing holes in the column portion 1312 and the frame side portion 1314 for weight reduction. As it approaches the base portion 111, the hole diameter of the hole portion 138 is reduced to secure the strength on the base portion 111 side. Further, by making holes, it is possible to form a shape that does not obstruct the flow of air to the fin portion 112 of the heat sink 110 enclosed therein, and it is possible to increase the rigidity without affecting the heat dissipation performance.

[0178] According to the configuration of FIG. 5, it is possible to configure a lighting fixture with high strength without providing reinforcing members corresponding to each direction for vibrations (forces) in different directions.

[0179] According to the configuration of FIG. 5, since the connecting portion 130 has a three-dimensional orthogonal plane, it is possible to provide a frame structure in a vibration-resistant fixture.

[0180] According to the configuration of FIG. 5, it is possible to increase the rigidity without providing separate members for vibrations in the horizontal and vertical directions, and it is possible to improve the vibration resistance performance.

[0181] ● FIGS. 11 and 12 (Fixture mounting bracket) The lighting fixture of the present embodiment is fixed to the ceiling surface by an arm 10 fixed to the connecting portion 130. The arm 10 is formed in a U-shape so as to straddle the lighting fixture 1, and is fixed to the two connecting portions 130 with two bolts respectively. The arm 10 is provided with holes corresponding to the two bolts respectively. The upper hole 12 is a circular hole with a substantially perfect circular shape, and the lower hole 13 is an arc-shaped hole. By changing the position of the arc-shaped hole of the lower hole 13 with the bolt of the upper hole 12 as the axis, the irradiation direction of the fixture can be changed.

[0182] The range of change in the irradiation direction is determined by the arc-shaped hole shape of the lower hole 13 of the arm 10. However, when an angle is formed, there is a risk of interference with the case part 123 or the top plate part 113 mounted on the instrument with respect to the arm 10. Therefore, it is common to set it to a certain angle (about 30 degrees generally). When it is possible to adjust the angle by about 90 degrees, it is possible to cope by lengthening the arm 10. However, since the center of gravity position of the instrument becomes far from the ceiling mounting surface, it becomes disadvantageous in terms of strength, and it becomes necessary to relatively increase the strength of the arm 10.

[0183] On the other hand, although the installation environment of the lighting fixture 1 is basically generally mounted on the ceiling, in the case where the ceiling is high, etc., the fixture may be installed on the wall surface and the irradiation angle of the lighting fixture may be adjusted for irradiation.

[0184] In that case, by using the fixture mounting bracket 200 shown in FIG. 11, it becomes possible to easily mount it on the wall surface even with a general arm 10 (angle adjustment is about ±30 degrees). The fixture mounting bracket 200 in the present embodiment has a bracket leg part 220 that is a wall surface fixing part fixed to the wall surface, and a fixture mounting part 210 provided at a predetermined angle with respect to the wall surface. The fixture mounting part 210 is provided with a fixture fixing hole 211 along the gravity direction. The fixture fixing hole 211 has a smaller diameter in the lateral direction toward the gravity direction.

[0185] The operator loosely fastens the bolt 291 and the nut 292 to the mounting hole 11 of the arm 10, inserts the bolt 291 from the bottom to the top into the wider upper part of the fixture fixing hole 211, and then slides the bolt 291 to the narrower lower part of the fixture fixing hole 211. In this state, since the bolt 291 is in a temporarily hung state in the fixture fixing hole 211 due to the weight of the fixture, the operator can install the fixture with both hands, and there is no need to hold the bolt 291 with one hand while installing the fixture, improving the workability.

[0186] In addition, in order to use the arm 10 of the lighting fixture 1 as it is without replacing it with another part, by using a fixture having an irradiation direction adjustment function, the adjustment of the irradiation direction also becomes easy. In addition, the fitting leg portion 220 of the appliance mounting fitting 200 in Fig. 11(a) has a wall mounting portion and a side surface portion 222 orthogonal to the wall mounting portion, and the side surface portion 222 is arranged so as not to overlap with the appliance fixing hole 211 of the appliance mounting portion 210 in a side view. Thereby, when installing the appliance, when installing the bolt 291 on the appliance mounting fitting 200, the work can be carried out from the side.

[0187] Also, the side on the appliance mounting portion 210 side of the side surface portion 222 of the appliance mounting fitting 200 in Fig. 11(a) is a curved portion 223, and a working gap 250 is provided with respect to the appliance mounting portion 210 in a side view. The curved portion 223 is separated from the appliance mounting portion 210 by 10 mm or more in a side view. The side surface portion 222 of the appliance mounting fitting 200 in Fig. 11(b) is connected to the appliance mounting portion 210 by a straight portion 224. The lengths of the sides at both left and right ends of the appliance mounting portion 210 and the length of the straight portion 224 of the side surface portion 222 are the same. The side surface portion 222 has a horizontally long rectangular window 225 along the straight portion 224. The window 225 provides a working gap 250 with respect to the appliance mounting portion 210 in a side view. The window 225 provides a gap 250 of 10 mm or more with respect to the appliance mounting portion 210 in a side view.

[0188] Due to the existence of the gap 250, when fixing the appliance with the bolt 291 and the nut 292 to the appliance mounting portion 210, the tool can be inserted from the side surface portion 222 of the appliance mounting fitting 200 to the back side of the appliance mounting portion 210 (the side opposite to the appliance mounting surface), and the construction can be easily carried out.

[0189] As shown in Fig. 11, only the appliance fixing hole 211 through which the mounting bolt 291 passes is formed in the appliance mounting portion 210, but in order to reduce the weight, a meat-stealing hole may be provided. As shown in Fig. 11, there are no welding points and fixing points in the appliance mounting portion 210, and it can be manufactured as an integral part formed by bending a single sheet metal. The fitting abdomen 230 of the appliance mounting fitting 200 in Fig. 11(a) may not be provided when the curved portion 223 greatly recedes, and the appliance mounting portion 210 may be directly connected to the fitting waist 240. Since the fixture mounting bracket 200 in Fig. 11(b) does not have a bracket belly 230 and a bracket waist 240, it is lighter than the fixture mounting bracket 200 in Fig. 11(a), and further, the number of bending times is small and manufacturing is easy. In addition, since the left and right sides of the fixture mounting portion 210 of the fixture mounting bracket 200 in Fig. 11(b) are connected to the straight portion 224 of the side surface portion 222 over the entire length except for the window 225, it has a firm structure, and the inclination angle of the fixture mounting portion 210 is less likely to change due to the weight of the lighting fixture.

[0190] Also, in the present embodiment of Fig. 12, although the arm 10 is fixed to the lower side of the fixture mounting portion 210, the arm 10 may be fixed to the upper side of the fixture mounting portion 210. In this case, via the gap 250, with the arm 10 to which the bolt 291 and the nut 292 are not attached placed on the upper side of the fixture mounting portion 210 of the fixture mounting bracket 200, the bolt 291 and the nut 292 are passed through the mounting hole 11 of the arm 10 and the fixture fixing hole 211, and the nut 292 is tightened to fix from the lower side. When the arm 10 is fixed to the upper side of the fixture mounting portion 210, since it becomes possible to hook the fixture to the fixture mounting bracket 200 before inserting the bolt 291 into the mounting hole 11 of the arm 10, the construction becomes even easier.

[0191] As shown in Fig. 12(b), the fixture mounting bracket 200 can be mounted on a mounting portion 900 such as a horizontal ceiling surface instead of a vertical wall. The fixture mounting bracket 200 shown in Fig. 12(b) has a smaller lateral diameter closer to the bracket belly 230, opposite to the fixture fixing hole 211 in Fig. 11, and the fixture fixing hole 211 has a smaller lateral diameter in the direction of gravity.

[0192] As shown in Fig. 12(c), the fixture mounting bracket 200 can be mounted on a mounting portion 900 such as an inclined wall surface instead of a vertical wall.

[0193] ●Fig. 21 (Cover packing 162) The cover packing 162 is disposed on the cover flange portion 1612 and is sandwiched between the cover flange portion 1612 and the base portion 111. As shown in FIG. 21, the cover flange portion 1612 has a flange horizontal portion 16121 and a flange belt portion 16122.

[0194] The flange horizontal portion 16121 is a rectangular ring portion that is orthogonal to the side surface of the main cover 1611 and parallel to the lower surface of the main cover 1611. The flange belt portion 16122 is an annular belt portion that is orthogonal to the flange horizontal portion 16121, is around the flange horizontal portion 16121, and is parallel to the side surface of the main cover 1611. The cover flange portion 1612 has an inner convex portion 1613, a plurality of convex portions 1614, and a plurality of concave portions 1615 inside the flange horizontal portion 16121 and the flange belt portion 16122.

[0195] The inner convex portion 1613 protrudes inward more than the inner surface of the side surface of the main cover 1611. There are two inner convex portions 1613 on each side, for a total of eight. The inner convex portion 1613 has an L shape and is an L-shaped protruding portion that protrudes along the inner surface of the side surface of the main cover 1611 from the inner surface of the cover flange portion 1612. The inner convex portion 1613 has a stepped portion 1616 at the upper part of the L-shaped corner. A light source portion 150 having a circular outer shape is positioned and attached to the orthogonal wall of the stepped portion 1616 among the total eight stepped portions 1616.

[0196] The outer shape of the cover packing 162 is the same as the outer shape of the flange belt portion 16122. The outer periphery of the cover packing 162 is pressed by the upper end surface of the flange belt portion 16122 and the base portion 111, is thinly deformed, and the thickness of the cover packing 162 becomes a predetermined thickness (predetermined crushing amount). The cover packing 162 has a plurality of concave portions 1622, a plurality of convex portions 1623, and one annular convex portion 1624 on the lower surface.

[0197] The annular convex portion 1624 is a rail-shaped protrusion that goes around the lower surface of the cover packing 162. The annular convex portion 1624 is pressed by the flange horizontal portion 16121 and the base portion 111 and is deformed to improve the water stop effect. There may be one or more annular convex portions 1624.

[0198] The recess 1622 of the cover packing 162 fits over the protrusion 1614 of the cover flange 1612 for close contact. The protrusion 1623 of the cover packing 162 is fitted into the recess 1615 of the cover flange 1612 and comes into close contact with it. The cover packing 162 has a lid portion 1621 that protrudes inward in a glans shape. The lid portion 1621 of the cover packing 162 comes into close contact with the inner protrusion 1613 of the cover flange portion 1612 so as to cover it.

[0199] The lid portion 1621 has a step portion 1629 having an orthogonal wall corresponding to the step portion 1616 of the inner convex portion 1613 . The step portion 1629 of the lid portion 1621 has a horizontal wall 1627 and an arcuate wall 1628 . The horizontal wall 1627 is a flat surface that abuts against the lower surface of the outer edge of the light source unit 150 . The arc wall 1628 is an arc-shaped surface that comes into contact with the outer circumferential surface of the light source unit 150 . The eight arc walls 1628 are surfaces having the same radius as the outer periphery radius of the light source unit 150 . The lid portion 1621 is disposed between the light source portion 150 and the cover portion 160, and thus can provide a cushioning function and can protect the light source portion 150 from impact.

[0200] The cover packing 162 has two annular protrusions 1625 on the upper surface. The annular protrusion 1625 is a rail-shaped protrusion that goes around the top surface of the cover packing 162 . Both of the two annular protrusions 1625 are formed inside the screw hole 1626 . The annular protrusion 1625 is deformed by pressure applied by the flange horizontal portion 16121 and the base portion 111, improving the water-stopping effect. There may be one or more annular protrusions.

[0201] Note that the outer shape of the cover packing 162 may be made the same as the inner shape of the flange belt portion 16122, and the cover packing 162 may be hidden inside the flange belt portion 16122. Although the cover packing 162 is not pressurized by the flange belt portion 16122, it is pressurized and deformed by the flange horizontal portion 16121 and the base portion 111.

[0202] Embodiment 2. With reference to FIGS. 22 to 27, the configuration of the lighting fixture 1 according to Embodiment 2 will be described. Hereinafter, the differences from Embodiment 1 will be described.

[0203] ● FIGS. 22, 23, and 24 (Configuration of the lighting fixture 1) As shown in FIGS. 22, 23, and 24, the connecting main portion 131 of the connecting portion 130 is composed only of the column portion 1312 of Embodiment 1. On the upper and lower sides of the column portion 1312, a top plate side protruding portion 132 and a base side protruding portion 133 are formed. A central pressing portion 1313 is formed at the lower part of the column portion 1312. The configurations of the top plate side protruding portion 132, the base side protruding portion 133, and the central pressing portion 1313 are the same as those of Embodiment 1.

[0204] The base portion 111 has two pins 1115 for positioning the heat dissipation sheet 171. The top plate portion 113 has a concave portion 1138 facing the top plate side protruding portion 132. The concave portion 1138 is recessed below the upper surface of the top plate portion 113 and is a flat portion having the same shape as the top plate side protruding portion 132. Since the concave portion 1138 is recessed below the upper surface of the top plate portion 113, the resistance of the top plate portion 113 to deformation is improved.

[0205] As shown in FIG. 24, on the base portion 111, an insulating sheet 172, a heat dissipation sheet 171, a light source substrate 151, and a lens portion 152 are arranged in this order. The lighting fixture 1 does not have a reinforcing portion 140, and the base portion 111 is reinforced by a bent portion 1111 bent in an L shape from the base portion 111.

[0206] ● Figures 25 and 26 (Bending portion 1111 of base portion 111) As shown in FIGS. 25 and 26, the base portion 111 has bending portions 1111 on each side. One bending portion 1111 is arranged on the straight portion of each of a pair of opposite sides of the base portion 111. Two bending portions 1111 are arranged on the straight portion of each of another pair of opposite sides of the base portion 111. There is an attachment space 1114 for attaching the connecting portion 130 between the two bending portions 1111.

[0207] The width of the connecting portion 130 and the width of the attachment space 1114 are the same width, and the base-side protruding portion 133 of the connecting portion 130 passes through the attachment space 1114 and is fixed to the lower surface of the base portion 111. The height of the bending portion 1111 is the same as or less than the thickness of the cover flange portion 1612.

[0208] Although not shown, the bending portion 1131 of the top plate portion 113 may also have the same configuration as the bending portion 1111 of the base portion 111 in FIGS. 25 and 26.

[0209] ● Figures 26 and 27 (Heat dissipation sheet 171 and insulating sheet 172) As shown in FIGS. 26 and 27, the light source substrate 151 is octagonal or substantially octagonal. The heat dissipation sheet 171 is octagonal or substantially octagonal and is larger than the light source substrate 151. The heat dissipation sheet 171 has a tongue portion 1711 having through holes on two sides. The heat dissipation sheet 171 is positioned by passing the pins 1115 of the base portion 111 through the through holes of the tongue portion 1711. The heat dissipation sheet 171 has wire passing holes 176 (not shown) on its outer periphery. The wire passing holes 176 have the same shape as the substrate holes 153, and are holes for inserting the wire passing packing 116 and passing the wiring 1221.

[0210] The insulating sheet 172 is in a ring shape. The insulating sheet 172 has an annular portion 173 and a return portion 174.

[0211] The annular portion 173 is a ring-shaped flat sheet. The inner shape of the annular portion 173 indicated by the dashed line is an octagon or a substantially octagonal shape smaller than the heat dissipation sheet 171, and the outer shape of the annular portion 173 is an octagon or a substantially octagonal shape larger than the heat dissipation sheet 171. The annular portion 173 has two pin holes 177 through which the pins 1115 of the base portion 111 pass.

[0212] The return portion 174 is arranged on every other side of the eight sides. The return portion 174 is folded back in a U shape by 180 degrees from the end of the annular portion 173 of the insulating sheet 172. The return portion 174 overlaps the outer edge of the light source substrate 151 while sandwiching the heat dissipation sheet 171, and covers the side end surface of the heat dissipation sheet 171 and the outer peripheral end portion of the light source substrate 151.

[0213] The return portion 174 is at four locations in the cross direction. However, since the insulating sheet 172 is flexible, the return portion 174 can be attached so as to overlap the outer edge of the light source substrate 151 while bending the annular portion 173.

[0214] The insulating sheet 172 has a wire passing portion 175 on its inner circumference. The wire passing portion 175 is a trapezoidal piece formed from the center of the inner side of the annular portion 173 toward the center. The wire passing portion 175 has a wire passing hole 176 having the same shape as the substrate hole 153 at the center. The wire passing hole 176 is a hole into which the wire passing packing 116 is fitted and through which the wiring 1221 passes. As shown in Fig. 27(e), the relationship of the diameters is as follows. Inner diameter of the insulating sheet 172 < Outer diameter of the light source substrate 151 < Outer diameter of the heat dissipation sheet 171 < Outer diameter of the insulating sheet 172 < Outer diameter of the base portion 111

[0215] In this embodiment, the insulation property is improved without increasing the usage amount of the insulating sheet 172. Furthermore, by covering with the return portion 174, the insulation distance is increased and the insulation property is improved. The return portion 174 may have one or more sides, and may be present on all eight sides.

[0216] ● Figure 28 (Modification example of the bent portion 1111 of the base portion 111) As shown in Figure 28, a bent portion 1113 may be formed in the mounting space 1114 between the two bent portions 1111. The bent portion 1113 is formed by bending the end of the base portion 111 into a 180-degree U shape. The bent portion 1113 has a screw hole 1118 similar to that of the base portion 111 at the center, and fixes the base-side protruding portion 133. Although not shown, some or all of the bent portions 1111 may be bent into a 180-degree U shape in the same manner as the bent portion 1113. Although not shown, the top plate portion 113 may also be provided with a bent portion similar to the bent portion 1113 of the base portion 111 in Figure 28. ● Figure 29 (Wiring through-hole portion 119) Figure 29 shows the wiring through-hole portion 119. The wiring through-hole portion 119 has a convex portion 114 and a wiring-through packing 116. The convex portion 114 has a box shape that bulges in the direction opposite to the direction in which the light source substrate 151 is installed from the base portion 111. The convex portion 114 provides a space 1141 between the back surface of the base portion 111 and the light source substrate 151. The convex portion 114 has a circular through-hole 115 at the center of the rectangular upper surface. The through-hole 115 is a hole for fitting the wiring-through packing 116. The wiring-through packing 116 has an annular groove 1161 on the outer peripheral portion at the upper and lower centers. The annular groove 1161 is an annular recess that is fitted into the through-hole 115. The upper part of the wiring-through packing 116 above the annular groove 1161 is exposed on the convex portion 114. The lower part of the through-wiring packing 116 below the annular groove 1161 is housed in the space 1141.

[0217] The through-wiring packing 116 has the same number of wiring holes 117 as the number of the wirings 1221, and each wiring hole 117 allows only one wiring to pass through. In addition, unevenness is provided inside the wiring hole 117 to prevent the intrusion of water and moisture.

[0218] The through-wiring packing 116 has a protruding portion 118. The protruding portion 118 is a portion that protrudes toward the side where the light source substrate 151 is located from the base portion 111. The horizontal cross-sectional shape of the protruding portion 118 is the same shape as or smaller than the substrate hole 153. The protruding portion 118 is inserted into the through-wiring hole 176 of the sheet 170 (the heat dissipation sheet 171 and the insulating sheet 172) and the substrate hole 153 of the light source substrate 151.

[0219] By configuring the protruding portion 118 to be thicker than the thickness of the light source substrate 151 with respect to the light source substrate 151, the wiring 1221 does not touch the edge of the substrate hole 153 of the light source substrate 151.

[0220] In this way, by providing the convex portion 114 on the base portion 111 and forming the space 1141 on the back side of the convex portion 114, the through-wiring packing 116 can be arranged on the base portion 111, and the wiring 1221 can be passed through without increasing the outer diameter of the substrate of the light source substrate 151.

[0221] As described above, the embodiments of the present invention have been described. Among these embodiments, two or more of them may be combined and implemented. Alternatively, one of these embodiments may be partially implemented. Alternatively, two or more of these embodiments may be partially combined and implemented. Note that the present invention is not limited to these embodiments, and various modifications can be made as needed.

Explanation of Reference Numerals

[0222] 1 Lighting fixture, 10 Arm, 11 Mounting hole, 12 Upper hole, 13 Lower hole, 100 Light source unit, 110 Heat sink, 111 Base part, 1111 Bending part, 1112 Light source fixing part, 1113 Bending part, 1114 Mounting space, 1115 Pin, 1118, 1119 Screw hole, 112 Fin part, 1121 Notch, 113 Top plate part, 1131 Bending part, 1132 Fin fixing part, 1138 Concave part, 1139 Screw hole, 114 Convex part, 1141 Space, 115 Through hole, 116 Wiring packing, 1161 Annular groove, 117 Wiring hole, 118 Protrusion, 119 Wiring through part, 120 Power supply unit, 121 Lighting circuit part, 122 Harness, 1221 Wiring, 1222 Power supply board, 123 Case part, 1231 Case body, 12311 Main case part, 12312 Step part, 12313 Case flange part, 12314 Horizontal ring part, 12315 Vertical band part, 1232 Case packing, 12321 Annular convex part, 12322 Annular ridge part, 1233 Bush, 129 Case fixture, 130 Connecting part, 131 Connecting main part, 1311 Connecting opening, 1312 Column part, 13121 Connecting hole, 1313 Central pressing part, 1314 Frame side part, 1315 Frame lower part, 1316 Frame upper part, 13131 Holding hole part, 132 Top plate side protruding part, 133 Base side protruding part, 134 Side protruding part, 1341 Side pressing part, 13411 Pressing notch part, 137 Top plate fixture, 138 Hole part, 139 Fixing part, 140 Reinforcing part, 141 Hole cylinder part, 142 Reinforcing hole part, 143 Inclined part, 147 Upper plate, 1471 Upward indentation part, 1472 Notch part, 148 Back plate, 149 Lower plate, 1481 Downward indentation part, 150 Light source part, 151 Light source board, 152 Lens part, 153 Board hole, 154 Board notch part, 160 Cover part, 1601 Body part, 1602, 1603 Film, 161 Cover, 1611 Main cover, 1612 Cover flange part, 1613 Inner convex part, 1614 Convex part, 1615 Concave part, 1616 Step part, 16121 Flange horizontal part, 16122 Flange band part, 162 Cover packing, 1621 Cover part, 1622 Concave part, 1623 Convex part, 1624 Annular convex part, 1625 Annular convex part, 1626 Screw hole, 1627 Horizontal wall, 1628 Arc wall, 1629 Step part, 169 Cover fixture, 170 Sheet, 171 Heat dissipation sheet, 1711Tongue portion, 172 Insulating sheet, 173 Annular portion, 174 Return portion, 175 Wire passing portion, 176 Wire passing hole, 177 Pin hole, 200 Instrument mounting fitting, 210 Instrument mounting portion, 211 Instrument fixing hole, 220 Fitting leg portion, 221 Wall mounting portion, 222 Side surface portion, 223 Curved portion, 224 Straight portion, 225 Window, 230 Fitting abdominal portion, 240 Fitting waist portion, 241 Wire hole, 250 Gap, 291 Bolt, 292 Nut, 900 Portion to be mounted, 901 Fitting fixture.

Claims

1. A light source substrate with a light-emitting element mounted on one side, a heat sink disposed on the other side of the light source substrate and exposed to the outside, a first sheet disposed between the light source substrate and the heat sink and having insulating performance, a second sheet disposed overlapping the first sheet between the light source substrate and the heat sink and having insulating performance, comprising: one of the first sheet and the second sheet has an annular, ring-shaped, or circular shape, and the one sheet has a folded-back portion folded into a U-shape with the light source substrate disposed therebetween, a lighting fixture.

2. A light source substrate with a light-emitting element mounted on one side, a heat sink disposed on the other side of the light source substrate and exposed to the outside, a first sheet disposed between the light source substrate and the heat sink and having insulating performance, a second sheet disposed overlapping the first sheet between the light source substrate and the heat sink and having insulating performance, comprising: the second sheet has a folded-back portion folded into a U-shape with the first sheet disposed therebetween, a lighting fixture.

3. A light source substrate with a light-emitting element mounted on one side, a heat sink disposed on the other side of the light source substrate and exposed to the outside, a first sheet disposed between the light source substrate and the heat sink and having insulating performance, a second sheet disposed overlapping the first sheet between the light source substrate and the heat sink and having insulating performance, comprising: the second sheet has a folded-back portion folded from an end, and the folded-back portion covers a side end surface of the first sheet and an outer peripheral end of the light source substrate, a lighting fixture.

4. A light source substrate with a light-emitting element mounted on one side, a heat sink disposed on the other side of the light source substrate and exposed to the outside, a first sheet disposed between the light source substrate and the heat sink and having insulating performance, a second sheet disposed overlapping the first sheet between the light source substrate and the heat sink and having insulating performance, comprising: the second sheet has a ring-shaped annular portion, and is a trapezoidal piece formed by protruding toward the center of the inner side of the annular portion and having a wire-passing portion for passing a wiring, a lighting fixture.

5. The first sheet is a heat dissipation sheet having insulating performance, and the second sheet is an insulating sheet, the lighting fixture according to any one of Claims 1 to 4.

6. The light source substrate is a substrate using a conductive base material, The lighting fixture according to any one of claims 1 to 5, wherein the heat sink is made of metal.

7. The heat sink has a plate-shaped base portion to which the light source substrate is attached, a plurality of fin portions arranged on the base portion, and a top plate portion attached so as to cover the fin portions, and the lighting fixture according to any one of claims 1 to 6, wherein the base portion, the fin portions, and the top plate portion are exposed to the outside.

8. a light source substrate having a light-emitting element mounted on one side, a heat sink disposed on the other side of the light source substrate and exposed to the outside, a first sheet disposed between the light source substrate and the heat sink and having insulation performance, a second sheet disposed overlapping the first sheet between the light source substrate and the heat sink and having insulation performance, and a lighting fixture in which only a part of one of the first sheet and the second sheet overlaps with only a part of the other sheet.

Images