JP2015079641A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device having a structure capable of facilitating heat radiation.SOLUTION: An illumination device includes a main body and a light source. The light source includes a heat sink in its upper portion, and an LED in its lower portion. The light source and the main body are arranged such that the heat sink is exposed in an upper end of the main body. The main body has two or more main body bottom plate parts to which the heat sink is attached. The main body includes a square-shaped opening in the center of the main body between the two main body bottom plate parts to which the heat sink is attached.

Description

  The present invention relates to an LED lighting device.

  Currently, in the lighting industry, switching from a lighting device using a conventional light source to a lighting device using an LED light source with high luminous efficiency and energy saving (hereinafter referred to as an LED lighting device) is progressing.

  Conventionally, a mercury lamp that has a longer life than an electric lamp and can irradiate brightly has been used for a lighting device used in a place having a high ceiling such as a factory. However, the LED lighting device has a longer life than a mercury lamp, can be illuminated brightly like a mercury lamp, has better startability than a mercury lamp, and can reduce power consumption compared to a mercury lamp. Therefore, switching to an LED lighting device is also desired for a lighting device used in a place having a high ceiling such as a factory.

  As an LED lighting device used in a place having a high ceiling such as a factory, there is one having a structure as in Patent Document 1.

JP2013-4168A

  By the way, in order to provide a long-life LED lighting device, it is necessary to improve the heat dissipation of the light source unit. For that purpose, heat dissipation of the light source unit where heat generation is concentrated is a problem.

  Patent Document 1 describes that a part of the heat dissipating fin is made higher than the other part to improve heat dissipation, but further improvement of heat dissipation is desired.

  An object of the present invention is to provide an LED lighting device having a structure capable of facilitating heat dissipation.

  In order to solve the above problems, the present invention includes a main body and a light source, and the light source includes a heat sink at an upper portion and an LED at a lower portion. The light source and the main body include the heat sink. In the lighting device attached so as to be exposed from the upper end of the main body, the main body has two or more main body bottom plate portions to which the heat sink is attached, and is located between the two main body bottom plate portions to which the heat sink is attached. Has a B-shaped opening.

  ADVANTAGE OF THE INVENTION According to this invention, the LED lighting apparatus of the structure which can make it easy to thermally radiate can be provided.

The side view of the illuminating device which concerns on this invention. The whole perspective view of the illuminating device which concerns on this invention when it sees from a floor surface direction. The whole perspective view of the illuminating device which concerns on this invention when it sees from a ceiling direction. The side view of the illuminating device of direction different from FIG. A perspective view of the lighting device when viewed from the ceiling with the upper part of the arm removed The disassembled perspective view of the illuminating device which concerns on this invention. A perspective view of the lighting device when viewed from the ceiling with the upper part of the arm removed It is an example at the time of arrange | positioning a square-shaped heat sink in parallel with an arm. (A) It is a flux distribution of an A1-A1 cross section. (B) F1-B1 cross section flux distribution. It is an example at the time of arrange | positioning a square heat sink alternately. (A) It is a flux distribution of A2-A2 cross section. (B) F2-B2 cross section flux distribution. It is an example at the time of arrange | positioning a mountain-shaped heat sink alternately. (A) It is a flux distribution of A3-A3 cross section. (B) F3-B3 cross section flux distribution. (A) Side view of the lighting device according to the present invention with the guard attached (b) Side view of the lighting device according to the present invention with the guard removed (c) Enlargement of the guard fixing portion of FIG. 14 (a) Figure (d) Enlarged view of the guard mounting part of Figure 14 (a) Perspective view showing installation of diffusion cover Perspective view of body side plate (A) Bottom view of lighting device according to the present invention (b) Bottom view of cylinder member (c) Side view of cylinder member (A) The perspective view of the illuminating device which concerns on this invention (b) The perspective view of a cylinder member

The illumination device 100 according to the embodiment of the present invention is characterized by the following configuration. It has a main body 21 and a light source 19, and the light source 19 has a heat sink 8 at the top and an LED at the bottom. The light source 19 and the main body 21 are attached so that the heat sink 8 is exposed from the upper end of the main body 21. In the illuminating device, the heat sink 8 has an uneven portion made up of a plurality of protrusions that are substantially plate-shaped and face the same direction, and three or more heat sinks 8 are connected to the main body 21 so as to form a line. Among the heat sinks 8 described above, the direction of the concavo-convex portions of the heat sinks 8 at both ends and the direction of the concavo-convex portions of the heat sinks 8 other than both ends can provide a lighting device that can facilitate heat dissipation. It is characterized by.

  Hereinafter, the structure of the illuminating device 100 concerning embodiment of this invention is demonstrated using attached FIG. For convenience of explanation in the embodiment, the ceiling side (not shown) is the upper side, and the floor side is the lower side.

The lighting device 100 is used in a place having a high ceiling such as a building, mainly a ceiling surface inside a factory. The lighting device 100 is used by being connected to an external power source by being connected to an indoor wiring fixture provided in a building and being fixed at a predetermined position. The position of the use position is not limited to this.

FIG. 1 is a side view of the lighting device 100. As will be described in detail later, the lighting device 100 includes an arm 1, a lighting device 20, a light source 19, and a main body 21. FIG. 2 is an overall perspective view of the lighting device 100 when the lighting device 100 installed on a ceiling surface (not shown) is viewed from the floor surface direction. FIG. 3 is an overall perspective view of the lighting device 100 when the lighting device 100 is viewed from the ceiling direction. FIG. 4 is a side view of the illumination device 100 in a direction different from that in FIG. FIG. 5 is a perspective view of the lighting device 100 when viewed from the ceiling direction with the upper portion of the arm 1 removed. FIG. 6 is an exploded perspective view of the lighting device 100. FIG. 7 is a perspective view of the illumination device 100 when viewed from the ceiling direction with the upper portion of the arm 1 removed. FIG. 8 shows an example in which a square heat sink 8 ′ is arranged in parallel with the arm 1. Fig.9 (a) is a flux distribution of the A1-A1 cross section of FIG. FIG. 9B is a flux distribution on the B1-B1 cross section of FIG. FIG. 10 shows an example in which the square heat sinks 8 ′ are alternately arranged. FIG. 11A shows the flux distribution of the A2-A2 cross section of FIG. FIG.11 (b) is a flux distribution of the B2-B2 cross section of FIG. FIG. 12 shows an example in which the mountain-shaped heat sinks 8 are arranged alternately. Fig.13 (a) is a flux distribution of the A3-A3 cross section of FIG. FIG.13 (b) is a flux distribution of the B3-B3 cross section of FIG.

As shown in FIG. 1, the arm 1 is a member formed to have a substantially concave shape in a side view. The arm 1 includes a plate-like ceiling portion 1a, a plate-like arm portion 1b provided so as to be substantially perpendicular to both ends of the ceiling portion 1a, and an inclined portion 1c that connects the ceiling portion 1a and the arm portion 1b. It consists of. The ceiling portion 1a, the arm portion 1b, and the inclined portion 1c are formed to have a substantially concave shape in a side view. In order to support the weight of the entire lighting device 100, the arm 1 is preferably formed of a material that can withstand the weight. Moreover, in the illuminating device 100, only the ceiling part 1a of the arm 1 contacts a ceiling (building). When transferring the heat generated from the lighting device 100 to the building, the heat is transferred through the arm 1. Therefore, it is desirable to form the arm 1 with a material having good heat conductivity. It is desirable that the arm 1 be made of a material such as iron because it is a material that has good heat conductivity and can withstand weight. In addition, when it forms with iron, it can have the continuity of the earthing | grounding of the lighting device 20, the light source 19, and the main body 21. FIG. Note that the arm 1 only needs to support the weight of the entire lighting device 100, and the thickness, length, shape, and material are not particularly defined.

As shown in FIG. 6, the lighting device 20 includes an upper plate 2, a lighting circuit 4, and a lower box 5. The appearance of the lighting device 20 has a substantially rectangular parallelepiped shape. The upper plate 2 is a substantially rectangular plate-shaped member. The lower box 5 is a member having a substantially rectangular parallelepiped shape whose upper surface is open. The upper plate 2 and the lower box 5 are connected to form a substantially rectangular parallelepiped part. The lighting circuit 4 is housed in a substantially rectangular parallelepiped component formed by the upper plate 2 and the lower box 5. However, the substantially rectangular parallelepiped component formed by the upper plate 2 and the lower box 5 is not limited to this as long as the lighting circuit 4 can be accommodated therein. In consideration of the case where the lighting device 20 is used outside a building, the lighting device 20 may have a waterproof structure as necessary.

  As shown in FIGS. 1, 3, 4, and 5, the heat sink 8 has a mountain shape with the center of the tip protruding. The heat sink 8 is a member that includes a substantially plate-shaped flat plate portion and an uneven portion provided on one surface of the flat plate portion, and has a mountain shape as a whole. The convex part in the concavo-convex part is substantially plate-shaped, and a plurality of convex parts protrude from the flat plate part so as to be substantially vertical. The direction in which the plurality of convex portions are provided is the same. Therefore, the recess also faces the same direction. By forming the mountain shape, there is an effect that heat from the LED 10 located in the center and external air come into contact with each other and easily radiate heat.

  Here, the chevron shape is formed by changing the height of the convex portion from the flat plate portion one by one and lowering from the convex portion located at the center to the convex portion located at both ends. Shape. In the present embodiment, this is a mountain shape. Here, since the part which does not overlap between convex parts increases, the part which touches external air increases, and there exists an effect that the cooling effect can further be heightened.

Alternatively, the chevron shape is a shape formed by providing a plurality of convex portions so that the height from the flat plate portion of each convex portion decreases from the center to the end portion. In addition, when the mountain shape is this shape, there is an effect that the heat sink 8 can be easily processed by extrusion molding.

As shown in FIG. 6, the light source 19 includes a heat sink 8, an LED 10, and an LED locking plate 11. As described above, an uneven portion is provided on one surface of the flat plate portion of the heat sink 8, but the LED 10 is attached to the other surface of the flat plate portion of the heat sink 8. The LED 10 and the heat sink 8 are connected via an insulating material (not shown), and the LED 10 is fixed to the heat sink 8 by an LED locking plate 11. LED10 is comprised from the board | substrate and the light emitting element mounted on the board | substrate. The heat generated in the light emitting element is transferred to the heat sink 8 through a substrate and an insulating material (not shown). The heat transmitted to the heat sink 8 is exposed to the external air by the uneven portion of the heat sink 8 and is radiated. The shape is not limited to this as long as the heat dissipation effect from the heat sink 8 is exhibited. Due to its role, the heat sink 8 is preferably formed of a material with good heat dissipation. In addition, since there is a relationship with the overall weight, it is desirable to form the material as lightly as possible. Therefore, the heat sink 8 is desirably formed of a material such as aluminum.

  As shown in FIG. 6, the main body 21 includes a main body support member 12, a reflection tube 14, a tube member 15, a main body side plate 16, a translucent cover 17, and a main body front and rear plate 18.

  The main body support member 12 includes a substantially plate-shaped main body bottom plate portion 13 and a main body support portion. The main body bottom plate portion 13 is a substantially plate-shaped portion. The main body bottom plate portion 13 is provided with a main body bottom plate portion opening 13a to which the cylindrical member 15 is attached. The number of the main body bottom plate openings 13 a is the same as the number of the light sources 19. The main body support portion is a plate-like portion provided at an end portion of the main body bottom plate portion 13 so as to be substantially perpendicular to the main body bottom plate portion 13. In the present embodiment, the main body support portions are provided in the same number as the arm portions 1b.

  The reflecting cylinder 14 is a substantially cylindrical member whose cross-sectional area gradually increases from the upper surface toward the lower surface. The upper and lower surfaces of the reflecting cylinder 14 have openings. In addition, the inner surface of the reflecting tube 14 has a mirror shape. A light source 19 is attached to the upper surface side of the reflecting tube 14, and the light from the light source 19 is reflected and guided downward (in the floor surface direction).

  The cylinder member 15 is a substantially cylindrical member. The upper surface and the lower surface of the cylindrical member 15 have openings. The inner diameter of the cylindrical member 15 is substantially the same as the outer shape of the reflecting cylinder 14, and is a shape that can lock the reflecting cylinder 14 inside.

  The cylindrical member 15 having the reflecting cylinder 14 therein is connected to the main body bottom plate portion 13. The position where the cylindrical member 15 is connected is a position where the main body bottom plate opening 13 a of the main body bottom plate 13 faces the opening of the cylindrical member 15.

  The main body side plate 16 is a substantially rectangular parallelepiped member having an upper surface and front and rear surfaces opened. The main body side plate 16 has a main body side plate opening 16a such that the lower surface opening of the reflecting tube 14 faces the lower surface. The main body front and rear plate 18 is a substantially plate-shaped member. The main body side plate 16, the main body front and rear plates 18, and the main body support member 12 are connected to form a substantially rectangular parallelepiped shape, and the reflecting cylinder 14, the cylindrical member 15, the LED 10, the LED locking plate 11, and the light transmitting cover are formed therein. 17. In addition, if these can be provided in an inside, it will not be restricted to a substantially rectangular parallelepiped shape.

  In the present embodiment, two main body side plates 16 are provided at a distance between two opposing main body front and rear plates 18. A square-shaped opening formed by the walls of the two main body side plates 16 and the two front and rear plates between the two main body side plates 16 when the lighting device 1 is assembled is referred to as an opening 30 in the lighting device 100. The effect obtained by providing the opening 30 will be described later.

The material of the translucent cover 17 may be a translucent material such as glass or plastic.

As shown in FIGS. 1 to 4, the lighting device 20 is connected to the arm portion 1 b of the arm 1. In the present embodiment, since the lighting device 20 has a rectangular parallelepiped shape, the short side plate portion is connected to the arm portion 1b. By connecting the lighting device 20 and the arm 1, heat from the lighting circuit 4 can be transmitted to the arm portion 1 b via the upper plate 2 and the lower plate 5.

  As shown in FIGS. 1-5, the arm part 1b of the arm 1 and the main body support part of the main body support member 12 are connected with a screw. Thereby, the main body 21 and the arm 1 are connected. In the present embodiment, when viewed from the arm portion 1b side, the ceiling portion 1a of the arm 1 and the main body bottom plate portion 13 of the main body supporting member 12 are connected so as to be substantially parallel.

  As shown in FIGS. 1 to 5, the light source 19 and the main body 21 are connected to each other by screwing the heat sink 8 to the main body bottom plate portion 13 of the main body support member 12. When the light source 19 and the main body 21 are connected, the heat sink 8 is connected so that the LED 10 faces from the opening of the main body supporting member and is positioned above the main body 21.

  The heat sink 8 (light source 19) is attached to the main body 21 so that the direction (vertical direction) of the plate of the arm portion 1b of the arm 1 and the direction in which the convex portion of the uneven portion of the heat sink 8 is provided are different. Yes. In the present embodiment, three heat sinks 8 are connected to one main body bottom plate portion 13. The three heat sinks 8 are arranged in a line, and the three heat sinks 8 are connected to the main body bottom plate portion 13 so that the directions of the uneven portions are different. The heat sinks 8 at both ends of the three are connected so as to be in the same direction as the direction of the ceiling portion 1a of the arm 1 (the same direction as the longitudinal direction of the main body bottom plate portion 13). The arm 1 is connected so as to have a direction orthogonal to the direction of the ceiling part 1a (the same direction as the direction of the short side direction of the main body bottom plate part 13).

The effect obtained by connecting the three heat sinks 8 to the main body bottom plate portion 13 so that the directions of the concavo-convex portions are different will be described later.

  When the lighting device 100 is turned on, the portion with the highest temperature in the lighting device 100 is the heat sink 8. Therefore, the temperature of the entire lighting device 100 can be lowered by cooling the heat sink 8. As a method of cooling the heat sink 8, there is heat dissipation from the heat sink 8 or heat transfer from the heat sink 8 to somewhere. In the lighting device, there is a correlation between heat and irradiation efficiency, and lowering of heat can suppress a decrease in irradiation efficiency.

In order to dissipate heat from the heat sink 8, it is desirable that air around the heat sink 8 does not stay. When the lighting device 100 is turned on, the temperature of the heat sink 8 rises, so that the air around the heat sink is warmed and raised by heat radiation from the heat sink 8. It is possible to promote cooling of the heat sink 8 by adopting a structure that causes heat convection in the air near the heat sink 8 and promotes heat convection.

Here, the effect by providing the opening part 30 is demonstrated. As described above, the opening 30 is an opening formed between the two main body side plates 16. The main body bottom plate portion 13 of the main body support member 12 is connected to the bottom surface portions of the two main body side plates 16. Further, three heat sinks 8 are provided on the main body bottom plate portion 13. Therefore, the opening 30 is between the heat sink 8 (hereinafter referred to as one heat sink) provided in one main body bottom plate portion 13 and the heat sink 8 (hereinafter referred to as other heat sink) provided in the other main body bottom plate portion 13. It can also be said that it is provided. As described above, by providing the □ -shaped opening 30 between the one heat sink 8 and the other heat sink 8, an effect of facilitating taking in air from the outside occurs. The air heated by the heat radiation from the heat sink 8 rises and can cause thermal convection. FIG. 5 shows the state of thermal convection. The air that enters the opening 30 from the outside of the lighting device 100 flows like the flow path A, warms and rises by the heat sink 8, and exits from the opening 30 as the flow path B. Thus, the air around the heat sink 8 can be cooled by the thermal convection from the flow path A to the flow path B, and cooling of the heat sink 8 can be promoted.

  Here, the effect by which the heat sink 8 is connected to the main body baseplate part 13 so that the direction of an uneven | corrugated | grooved part may differ is demonstrated. As described above, the heat sink 8 has an uneven portion, and the main body 21 is provided with three heat sinks 8 arranged in a row. Of the two heat sinks 8, the direction of the uneven portion of the central heat sink 8 is different.

  As described above, the direction of the concave and convex portions of the heat sink 8 at both ends of the three heat sinks 8 and the direction of the concave and convex portions of the central heat sink 8 of the three heat sinks 8 make it easy to take in air from the outside. An effect occurs. The air heated by the heat radiation from the heat sink 8 rises and can cause thermal convection. The air around the heat sink 8 can be cooled by the thermal convection, and the cooling of the heat sink 8 can be promoted.

  In this embodiment, particularly as shown in FIG. 7, the heat sinks 8 at both ends of the three are in the same direction as the direction of the ceiling portion 1 a of the arm 1 (the same direction as the longitudinal direction of the main body bottom plate portion 13). The heat sink 8 at the center of the three is connected so as to be in a direction orthogonal to the direction of the ceiling portion 1a of the arm 1 (the same direction as the short direction of the main body bottom plate portion 13). Of the air that enters the heat sink 8 from the periphery of the lighting device 100, the air that enters the lighting device 100 from the side portion on the side where the front and rear plates 18 are located enters the uneven portions of the heat sink 8 at both ends and radiates heat from the heat sink 8 at both ends. Warms and rises.

  Here, the air that enters the lighting device 100 from the side on the side without the main body front and rear plate 18 enters the uneven portion of the central heat sink 8 and is warmed and raised by the heat radiation from the central heat sink 8. Flowing into.

  The air that is warmed and rises while passing through the heat sinks 8 at both ends further rises and flows like the flow path C by hitting the uneven portion of the central heat sink 8 and hitting the rising flow of the flow path D.

As described above, the direction of the uneven portion of the heat sink 8 at both ends of the three heat sinks 8 is different from the direction of the uneven portion of the central heat sink 8 of the three heat sinks 8. Thermal convection can be further promoted by connecting the concave and convex portions of the heat sink 8 so as to face the heat sink 8 located in the center. Since heat convection can be further promoted, the cooling of the heat sink 8 can be further promoted.

  Here, the effect when the square heat sinks 8 ′ are arranged alternately instead of the mountain heat sink 8 described above will be described with reference to FIGS. 8 to 11. FIG. 8 shows a structure in which square heat sinks 8 'are arranged in parallel to the ceiling 1a of the arm 1, and FIG. 10 shows a structure in which square heat sinks 8' are arranged alternately. The material of the square heat sink 8 'is aluminum alloy, the surface of the square heat sink 8' is black anodized, the amount of heat generated per LED board on which the LED 10 is mounted is 48.2W, and the square heat sink 8 'and the LED board FIG. 2 shows streamlines when a thermal analysis is performed by setting a thermal resistance between the two. As shown to Fig.9 (a), the flow of the air from the center side collides with the bottom face of the lighting device 20, and is winding. Further, as shown in FIG. 9B, air enters the heat sink 8 'arranged on the left and right, but there is little air entering the heat sink 8' arranged in the center. The average temperature of the LED substrate when the square heat sink 8 ′ of FIG. 8 is arranged in parallel with the arm was 94 ° C. at the left and right and 97 ° C. at the center, and the calculation result was high at the center.

FIG. 11 shows streamlines when a square heat sink 8 ′ is arranged as shown in FIG. As shown to Fig.11 (a), there exists air flow from the outer side and the center side, and the air has flowed almost without colliding with the bottom face of the lighting device 20. FIG. Further, as shown in FIG. 11 (b), the heat sinks 8 ′ arranged on the left and right are flowing with air from outside, and as shown in FIG. 11 (a), the heat sinks 8 ′ arranged in the center. There is also air flowing in from the outside. The average temperature of the LED substrate when the square heat sinks 8 ′ of FIG. 10 are arranged alternately is 93 ° C. on the left and right and 92 ° C. on the center. As shown in FIG. 10, by arranging the heat sinks 8 ′ alternately, air flows from the outside, so that the temperature of the LED substrate can be reduced. As the temperature of the LED decreases, the lifetime increases and the efficiency increases.

  The effect when the mountain-shaped heat sinks 8 are arranged alternately will be described with reference to FIGS. In order to confirm the effect of the chevron heat sink 8, the chevron heat sink 8 has the same volume and the same surface area as the square heat sink 8 '.

FIG. 13 shows streamlines when the mountain-shaped heat sinks 8 are alternately arranged as shown in FIG. As shown to Fig.13 (a), there exists an air flow from the outer side and the center side, and the air has flowed almost without colliding with the bottom face of the lighting device 20. FIG. Further, as shown in FIG. 13 (b), the heat sinks arranged on the left and right flow from the outside, and the heat sink arranged in the center also flows from the outside as shown in FIG. 13 (a). Air is flowing in. The average temperature of the LED substrate when the mountain-shaped heat sinks 8 of FIG. Compared with the case where the square heat sinks 8 'of FIG. 11 are arranged alternately, the radiation capacity is increased by about 3% when the mountain heat sinks 8 are arranged alternately, so that the temperature of the LED substrate is reduced. Can do. As the temperature of the LED decreases, the lifetime increases and the efficiency increases.

  In the present embodiment, the upper surface of the main body 21 is provided to be perpendicular to the arm 1, but this is not restrictive. It is also possible to provide the arm 21 so that the upper surface of the main body 21 has an angle other than vertical. For example, the upper surface of the main body 21 can be provided at 30 degrees with respect to the arm 1. By providing in this way, the irradiation direction of the light source 19 can also be inclined by 30 degrees with respect to the ceiling surface of the arm 1, and a desired angle can be obtained.

  As shown in FIGS. 6 and 7, the heat sink 8 can easily take in air from outside the main body by lowering both ends of the convex portion and gradually increasing the height toward the center.

  Moreover, the main body bottom plate part 13 in front of the heat sink 8 is flat, and air from the outside of the main body can be clarified to perform stable heat dissipation.

Further, as shown in FIG. 8, a plurality of heat sinks 8 can be disposed on the bottom plate portion 13 of the main body, and the recesses parallel to the arm 1 are arranged on the same line, so that air from outside the main body can be drawn. Heat generation can be reduced by attracting uniformly from both ends and concentrating it to the center to allow convection upward.

  As shown in FIGS. 14A to 14D, a guard 40 may be provided in the illumination device 100 of the present embodiment. By providing the guard 40, the irradiation part of the illumination device 100 can be protected from an impact from below the main body. For example, the irradiation unit of the lighting device 100 can be protected from an impact caused by a ball or the like used in a gymnasium.

The guard 40 is a lattice-shaped member. The guard 40 is provided with a guard fixing portion 40 a and a guard attachment portion 40 b for attaching the guard 40 to the lighting device 100. The guard fixing portion 40a and the guard attachment portion 40b are portions that protrude in the same direction in order to attach the guard 40 to a receiving hole (not shown) provided in the main body front and rear plate 18. The guard fixing portion 40a is fitted into the receiving hole from one side from the inside of the main body front and rear plate 18 and the guard mounting portion 40b from the outer side of the main body front and rear plate 18, and the guard fixing portion 40a is fitted from the outside of the main body front and rear plate 18 by the nut 41. By securing with a nut, the guard 40 can be easily attached to the lighting device 100 (see FIGS. 14C and 14D).

As shown in FIG. 15, a diffusion cover 50 may be provided in order to diffuse light and broaden the light distribution. When attaching the diffusion cover 50, the diffusion cover 50 having a shape that simultaneously covers the three light sources can be attached by covering the diffusion cover 50 from the outside with the cover frame 51 and fixing the front and rear plates 18 and the cover frame 51.

As shown in FIG. 16, an emboss 16 b that protrudes inward is provided at the corner of the side surface of the main body side plate 16. Since the emboss 16 b is for temporarily fixing the translucent cover 17, the emboss 16 b is provided with a certain distance from the bottom surface of the main body side plate 16. By providing the emboss 16b on the side surface of the main body side plate 16, the translucent cover 17 is sandwiched between the emboss 16b and the lower surface forming the main body side plate opening 16a of the main body side plate 16, so There is an effect that it can be fixed and rattling can be prevented without using a screw or the like even after assembly.

As shown in FIGS. 17 and 18, the cylindrical member 15 and the reflective cylinder 14 may be provided with a notch 15 a (14 a) in a part of the outer periphery. By cutting out a part of the outer periphery, the light distribution can be controlled without increasing the interval between the light sources.

In the present embodiment, the number of component parts and parts such as three heat sinks 8 provided on one main body bottom plate part 13 and one opening is defined, but this is not restrictive. The number may be increased or decreased as long as the same effect is obtained.

DESCRIPTION OF SYMBOLS 1 Arm 1a Ceiling part 1b Arm part 1c Inclined part 2 Upper board 4 Lighting circuit 5 Lower board 8, 8 'Heat sink 10 LED
DESCRIPTION OF SYMBOLS 11 LED locking plate 12 Main body support member 13 Main body bottom plate part 13a Main body bottom plate part opening part 14 Reflecting cylinder 15 Cylindrical member 15a Notch 16 Main body side board 16a Main body side board opening part 16b Emboss 17 Translucent cover 18 Main body front and rear plate 19 Light source 20 Lighting Device 21 Main body 30 Opening portion 40 Guard 40a Guard fixing portion 40b Guard mounting portion 50 Diffusion cover 51 Cover frame 100 Illumination devices A, B, C, D

Claims (1)

A lighting device having a main body and a light source, the light source having a heat sink at an upper portion and an LED at a lower portion, wherein the light source and the main body are attached so that the heat sink is exposed from an upper end of the main body. In
The main body has two or more main body bottom plate portions to which the heat sink is attached,
A lighting device having a B-shaped opening in the center of the main body between the two main body bottom plate portions to which the heat sink is attached.