JP6260644B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  2. Description of the Related Art An illumination device using a light emitting element such as an LED (Light Emitting Diode) as a light source is widely used. In recent lighting devices with a large luminous flux, the temperature of the light emitting element tends to increase. When the temperature of the light-emitting element increases due to heat generation of the light-emitting element, energy consumption efficiency decreases and the life of the light-emitting element is shortened. For this reason, it is desired to improve the heat dissipation property to dissipate heat of the light emitting element so that the temperature of the light emitting element does not increase. In particular, since the lighting device for a high ceiling attached to the ceiling is placed in an environment with high air temperature, it is difficult to suppress the temperature rise of the light emitting element.

  The conventional lighting device disclosed in Patent Document 1 below is configured as follows. A plurality of lighting units and a fixed frame for fixing the plurality of lighting units. Each lighting unit includes a substrate, a fin base portion, and a plurality of heat radiating fins. A light emitting element is mounted on one surface of the substrate. The fin base portion has a first surface on which the other surface of the substrate is installed, and supports the substrate installed on the first surface. The radiating fin has a planar shape erected on the second surface of the back surface of the first surface of the fin base portion with a space therebetween.

JP 2013-201080 A

  In the conventional lighting device described above, dirt such as dust or oil adheres to the upper surface of the fin base portion and the surface of the heat radiating fin, so that the heat radiating effect is lowered. In particular, since a lighting device for a high ceiling or the like is mounted at a high place, it is difficult to frequently clean the fin base portion and the radiating fin. Therefore, a large amount of dirt such as dust or oil accumulates on the upper surface of the fin base portion and the surface of the heat radiating fin, which may greatly reduce the heat radiation efficiency.

  The present invention has been made to solve the above-described problems, and provides an illumination device that can reduce contamination of a heat sink, can suppress a decrease in heat dissipation efficiency of the heat sink, and can cool a power supply section satisfactorily. For the purpose.

An illumination device according to the present invention includes a first illumination unit, a second illumination unit adjacent to the first illumination unit, and a power supply unit that supplies power to the first illumination unit and the second illumination unit. Each of the lighting unit and the second lighting unit includes a light emitting portion that emits light downward, a heat sink on the back side of the light emitting portion, and a top plate portion that covers the heat sink as a whole. There is a gap serving as a ventilation portion between the top plate portion of the first lighting unit and the top plate portion of the second lighting unit, and the power supply portion is a first portion supported by the top plate portion of the first lighting unit. And a second part supported by the top plate part of the second lighting unit, a third part above the ventilation part, and a base part of a heat sink of each of the first lighting unit and the second lighting unit are adjacent to each other. distance L1 is a structure of more than the width L2 of the vent, the It is obtain things.

  According to the lighting device of the present invention, each of the first lighting unit and the second lighting unit includes a top plate portion that covers the entire top of the heat sink, and the top plate portion of the first lighting unit and the second lighting unit. Since there is a gap serving as a ventilation portion between the top plate portion and the heat sink, dirt on the heat sink can be reduced, a reduction in heat dissipation efficiency of the heat sink can be suppressed, and the power supply portion can be cooled well.

1 is a perspective view showing a lighting device according to Embodiment 1. FIG. FIG. 3 is a top view illustrating the lighting device according to the first embodiment. It is a perspective view of an illuminating device. It is a perspective view of an illuminating device. It is a bottom view of the illuminating device shown in FIG. It is a disassembled perspective view of the illuminating device shown in FIG. 3 is a perspective view and an exploded perspective view of a light source unit in Embodiment 1. FIG. FIG. 6 is a perspective view showing a lighting device according to a second embodiment. FIG. 6 is a top view illustrating a lighting device according to a second embodiment. FIG. 6 is a cross-sectional side view showing a lighting device according to a second embodiment. FIG. 6 is a cross-sectional side view showing a lighting device according to a second embodiment. FIG. 10 is a perspective view showing a lighting device according to a third embodiment. It is a perspective view which shows the illuminating device of Embodiment 4. FIG.

  Hereinafter, embodiments will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals, and redundant description is simplified or omitted. The present disclosure may include any combination of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a lighting apparatus 1A according to the first embodiment. FIG. 2 is a top view showing the lighting apparatus 1A of the first embodiment, that is, a view seen from above. 1A of Embodiment 1 shown in these drawings can be preferably used as an indoor or outdoor lighting fixture. The lighting device 1A of the first embodiment can be particularly preferably used as a lighting device for high ceilings such as a factory, a warehouse, a gymnasium, and a competition facility. The lighting device 1A of the first embodiment can be preferably used for an application in which a space under the ceiling is illuminated by being attached near the ceiling and emitting light downward. In the following description, “up” and “down” are defined based on the posture when the lighting device 1A is used.

  As shown in FIG. 1, the lighting device 1 </ b> A includes a first lighting unit 2, a second lighting unit 3, and a power supply unit 4. The second lighting unit 3 is disposed adjacent to the first lighting unit 2. The second lighting unit 3 has the same or similar configuration as the first lighting unit 2. Each of the first lighting unit 2 and the second lighting unit 3 includes a light emitting portion 5, a heat sink 6, a top plate portion 7, and a frame 8.

  The light emitting unit 5 emits light downward. Details of the light emitting section 5 will be described later. The heat sink 6 is on the back side, that is, the upper side of the light emitting unit 5. The heat sink 6 dissipates, that is, dissipates, heat generated in the light emitting unit 5 to the surrounding air. The heat sink 6 includes a base portion 6a and a plurality of fins 6b. The base portion 6a includes an upper surface and a lower surface. The shape of the base portion 6a may be a plate shape. The lower surface of the base portion 6 a is in contact with the back surface of the light emitting portion 5. When the lighting device 1A is used, the upper surface and the lower surface of the base portion 6a are usually horizontal.

  The fin 6b protrudes from the upper surface of the base portion 6a. The fin 6b is perpendicular to the upper surface of the base portion 6a. Fin 6b in the present embodiment has a plate shape. The plurality of fins 6b are arranged in parallel to each other. Not only in such a configuration, the fin 6b may be a pin fin having a pin shape. The heat generated in the light emitting part 5 is thermally conducted to the base part 6a and further conducted from the base part 6a to the fins 6b. Heat is dissipated from the surfaces of the base portion 6a and the fins 6b to the surrounding air. By increasing the surface area by the heat sink 6, the heat generated in the light emitting portion 5 can be efficiently dissipated. As a result, since the temperature of the light emitting unit 5 can be lowered, the energy consumption efficiency, that is, the light emission efficiency of the light emitting unit 5 is improved, and the life of the light emitting unit 5 can be extended.

  The top plate portion 7 entirely covers the heat sink 6. There is a space through which air can pass between the top plate portion 7 and the heat sink 6. If it is this Embodiment, the following effects are acquired by providing the top-plate part 7. FIG. By receiving dust or oil from the lighting device 1A on the top plate portion 7, dirt consisting of dust or oil adheres to and accumulates on the upper surface of the base portion 6a of the heat sink 6 and the surfaces of the plurality of fins 6b. Can be suppressed. A decrease in the heat dissipation efficiency of the heat sink 6 due to the contamination can be reliably reduced. When the lighting device 1A is mounted at a high place such as near the ceiling, it is difficult to frequently clean the heat sink 6. Even if the heat sink 6 is not frequently cleaned, the dirt can be prevented from accumulating on the upper surface of the base portion 6a of the heat sink 6 and the surfaces of the plurality of fins 6b, so that the temperature of the light emitting portion 5 can be lowered. It becomes.

  In the present embodiment, the top plate portion 7 covers the entire base portion 6a of the heat sink 6 when viewed from above (see FIG. 2). On the upper surface of the base portion 6a that is horizontal or nearly horizontal, dirt such as dust or oil that deposits from above accumulates as it is. Since heat is also dissipated from the surface of the base portion 6a to the surrounding air, in order to maintain the heat dissipation efficiency of the heat sink 6, it is important to suppress the accumulation of dirt on the upper surface of the base portion 6a. In the present embodiment, the top plate portion 7 covers the entire base portion 6a of the heat sink 6 when viewed from above, so that dust or oil or the like that falls from above the lighting device 1A is placed on the upper surface of the base portion 6a. It can be surely suppressed from falling. Therefore, it is possible to more reliably suppress the accumulation of dirt on the upper surface of the base portion 6a. In the present invention, the top plate portion 7 does not necessarily cover the entire base portion 6a of the heat sink 6 when viewed from above. When viewed from above, the top plate portion 7 desirably covers 80% or more of the area of the base portion 6a of the heat sink 6, and more desirably covers 90% or more of the area of the base portion 6a of the heat sink 6. By doing so, effects similar to those described above can be obtained.

  The frame 8 holds the light emitting portion 5, the heat sink 6, and the top plate portion 7. The light emitting portion 5, the heat sink 6, and the top plate portion 7 are fixed to the frame 8.

  The power supply unit 4 supplies power to the first lighting unit 2 and the second lighting unit 3. The power supply unit 4 has a built-in power supply circuit that receives the AC power and generates DC power for lighting the light emitting unit 5. 1 A of illuminating devices of this Embodiment are provided with the two power supply parts 4 of the power supply part 4 which supplies electric power to the 1st illumination unit 2, and the power supply part 4 which supplies electric power to the 2nd illumination unit 3. FIG. In other words, the power supply unit 4 that supplies power to the first illumination unit 2 and the power supply unit 4 that supplies power to the second illumination unit 3 are separate. The power supply unit 4 that supplies power to the first lighting unit 2 and the power supply unit 4 that supplies power to the second lighting unit 3 may be integrally provided without being limited to such a configuration. That is, a configuration may be provided in which one power supply unit 4 that supplies power to both the first lighting unit 2 and the second lighting unit 3 is provided.

  The lighting device 1 </ b> A according to Embodiment 1 includes a support member 9. The support member 9 includes a first support portion 9a that supports the frame 8 of the first illumination unit 2, a second support portion 9b that supports the frame 8 of the second illumination unit 3, and the first support portion 9a and the second support. And a connecting portion 9c that connects the portion 9b. Since the support member 9 holds the first lighting unit 2 and the second lighting unit 3, the relative positional relationship between the first lighting unit 2 and the second lighting unit 3 is fixed. In the present embodiment, the bolts 10 are fixed between the frame 8 of the first lighting unit 2 and the first support portion 9a and between the frame 8 of the second lighting unit 3 and the second support portion 9b. However, it may be fixed by other fixing methods such as welding. The lighting device 1A can be attached to the ceiling or the like by fixing the support member 9 to the ceiling or the like. In FIG. 2, the support member 9 is a cross-sectional view cut at a position midway between the first support portion 9 a and the second support portion 9 b. For this reason, the upper surface of the support member 9 does not appear in FIG.

  As shown in FIG. 2, the lighting device 1 </ b> A includes a ventilation portion 11 between the top plate portion 7 of the first illumination unit 2 and the top plate portion 7 of the second illumination unit 3. The ventilation portion 11 is a gap formed between the top plate portion 7 of the first illumination unit 2 and the top plate portion 7 of the second illumination unit 3. In the present embodiment, when viewed from above, each shape of the first lighting unit 2 and the second lighting unit 3 is a square or a rectangle. When viewed from above, the shape of the ventilation portion 11 is an elongated shape formed between one side of the first lighting unit 2 and one side of the second lighting unit 3.

  Each power supply unit 4 includes a first part 4 a supported by the top plate part 7 of the first lighting unit 2, a second part 4 b supported by the top plate part 7 of the second lighting unit 3, and a ventilation part 11. And a third portion 4c on the top. Since the power supply unit 4 includes the first part 4 a and the second part 4 b, the weight of the power supply part 4 is distributed to the top plate part 7 of the first illumination unit 2 and the top plate part 7 of the second illumination unit 3. Is done. Thereby, the weight balance as the whole illuminating device 1A can be made favorable. The following effects are acquired because the power supply part 4 is provided with the 3rd site | part 4c on the ventilation | gas_flowing part 11. FIG. When the lower surface of the third portion 4c of the power supply unit 4 touches the air, heat can be efficiently dissipated from the lower surface to the air. Ascending airflow generated by receiving heat from the heat sinks 6 of the first lighting unit 2 and the second lighting unit 3 passes through the ventilation part 11 and flows along the surface of the power supply part 4. Heat can be efficiently dissipated from the surface of the power supply unit 4 to the air by the airflow flowing along the surface of the power supply unit 4. From these things, cooling of the power supply part 4 can be made favorable and overheating of the power supply part 4 can be suppressed reliably.

  There is a gap through which air can pass between the first lighting unit 2 and the second lighting unit 3. Air can rise from the space below the light emitting portion 5 toward the ventilation portion 11 through the gap between the first lighting unit 2 and the second lighting unit 3. Thereby, it becomes possible to make the ascending airflow passing through the ventilation part 11 flow more smoothly.

  In the present embodiment, it is as follows when viewed from above. The power supply unit 4 and the ventilation unit 11 intersect. The power supply unit 4 has a shape whose longitudinal direction is the left-right direction in FIG. The ventilation part 11 has a shape whose longitudinal direction is the vertical direction in FIG. The longitudinal axis of the power supply unit 4 and the longitudinal axis of the ventilation unit 11 intersect. According to the above configuration, the rising airflow that has passed through the ventilation portion 11 flows along the side surface of the power supply unit 4. Therefore, the cooling effect of the power supply unit 4 by the ventilation unit 11 can be further improved.

  In the present embodiment, it is as follows when viewed from above. Each power supply unit 4 has a rectangular shape. Each power supply part 4 is arrange | positioned mutually parallel. There is a gap through which air can pass between one power supply unit 4 and the other power supply unit 4. The rising airflow that has passed through the ventilation part 11 from the heat sink 6 flows through the gap, so that the cooling effect of the power supply part 4 can be further improved.

  Each top plate portion 7 of the first illumination unit 2 and the second illumination unit 3 includes a flat flat portion 7a, a first inclined portion 7b, and a second inclined portion 7c. The flat portion 7 a is parallel to the base portion 6 a of the heat sink 6. The flat portion 7a is horizontal when the lighting device 1A is used. The first inclined portion 7b and the second inclined portion 7c are inclined with respect to the flat portion 7a. The 1st inclination part 7b and the 2nd inclination part 7c incline with respect to a horizontal surface at the time of use of 1 A of illuminating devices.

  The top plate portion 7 may be formed by processing one metal plate. The first inclined portion 7b and the second inclined portion 7c may be formed by partially bending a metal plate forming the top plate portion 7.

  The first inclined portion 7 b is at least partially below the power supply unit 4. The first inclined portion 7b is inclined obliquely downward from the boundary portion 7d with the flat portion 7a. At least a part of the ventilation portion 11 is formed between the first inclined portion 7 b of the top plate portion 7 of the first illumination unit 2 and the first inclined portion 7 b of the top plate portion 7 of the second illumination unit 3. . The first inclined portion 7b is inclined obliquely upward from the ventilation portion 11 toward the boundary portion 7d. If it is this Embodiment, the following effects will be acquired because the top-plate part 7 was provided with the 1st inclination part 7b. A gap is formed between the first inclined portion 7 b and the lower surface of the power supply unit 4, and an area in contact with air on the lower surface of the power supply unit 4 is enlarged. Ascending airflow from the heat sink 6 flows along the first inclined portion 7 b, the ascending airflow is efficiently guided around the power supply unit 4. From these things, the power supply part 4 can be cooled more favorably.

  In the present embodiment, it is as follows when viewed from above. The power supply unit 4 and the first inclined portion 7b intersect. The 1st inclination part 7b has a shape which makes the up-down direction in FIG. 2 a longitudinal direction. The longitudinal axis of the power supply unit 4 intersects the longitudinal axis of the first inclined portion 7b. According to said structure, the cooling effect of the power supply part 4 can further be improved.

  The second inclined portion 7c is in a position that does not overlap with the power source portion 4 when viewed from above. The second inclined portion 7c is inclined obliquely downward from the boundary portion 7e with the flat portion 7a. If it is this Embodiment, the trend of the upward airflow from the heat sink 6 can be favorably controlled because the top-plate part 7 was provided with the 2nd inclination part 7c.

  FIG. 3 is a perspective view of the lighting device 100. The lighting device 100 illustrated in FIG. 3 includes a single lighting unit having the same configuration as the first lighting unit 2 or the second lighting unit 3 included in the lighting device 1A of the first embodiment. The illumination device 100 includes a power supply unit 4, a light emitting unit 5, a heat sink 6, a top plate unit 7, a frame 8, and a support member 12. The power supply unit 4, the light emitting unit 5, the heat sink 6, the top plate unit 7, and the frame 8 included in the lighting device 100 are the same as those included in each of the first lighting unit 2 and the second lighting unit 3 of the lighting device 1 </ b> A. is there.

  The support member 12 supports the frame 8. The support member 12 includes a long hole 12a and a mounting surface 12b that are curved in an arc shape. The bolt 10 is tightened with respect to the screw hole of the frame 8 through the long hole 12 a, so that the support member 12 is fixed to the frame 8. The support member 12 is fixed to the ceiling or the like with the mounting surface 12b in contact with the surface such as the ceiling. In the state of FIG. 3, the mounting surface 12 b is parallel to the flat portion 7 a of the top plate portion 7. When the surface such as the ceiling is horizontal, the lighting device 100 may be fixed to the surface such as the ceiling in the state of FIG. The support member 12 can also be fixed to the frame 8 in a posture in which the mounting surface 12 b is inclined with respect to the flat portion 7 a of the top plate portion 7. That is, after loosening the bolt 10 from the state of FIG. 3 and tilting the support member 12 so that the bolt 10 moves relatively along the long hole 12a, the mounting surface 12b is tightened again by tightening the bolt 10 again. The portion 7 is inclined with respect to the flat portion 7a. When a surface such as a ceiling is inclined, the lighting device 100 can be installed at an appropriate angle by changing the angle of the support member 12 according to the inclination.

  In the illuminating device 100 shown in FIG. 3, the power supply part 4 is on the part on the flat part 7a of the top plate part 7, the part on the first inclined part 7b, and the second inclined part 7c. A region. With such a configuration, a gap is formed between the lower surface of the power supply unit 4 and the first inclined portion 7b and the second inclined portion 7c, and air contacts the lower surface of the power supply unit 4, so that the power supply unit 4 is cooled well. it can.

  FIG. 4 is a perspective view of the lighting device 100. The illumination device 100 shown in FIG. 4 is the same as the illumination device 100 shown in FIG. 3 except that the arrangement of the power supply unit 4 is different. In the illuminating device 100 shown in FIG. 4, the power supply unit 4 is entirely on the flat part 7 a of the top plate part 7. The power supply part 4 in the illuminating device 100 may be arrange | positioned in the direction shown in FIG.

  FIG. 5 is a bottom view of the illumination device 100 shown in FIG. 6 is an exploded perspective view of the lighting device 100 shown in FIG. As shown in FIG.5 and FIG.6, the light emission part 5 in this Embodiment is provided with the light source part 5a, the reflector 5b, and the cover glass 5c. The reflector 5b reflects at least a part of the light emitted from the light source unit 5a. The light emitted from the light source unit 5a passes through the cover glass 5c and is emitted to the external space. By providing the cover glass 5c, it is possible to prevent dirt from adhering to the light source unit 5a and the reflector 5b. The light emitting unit 5 in the present embodiment includes four light source units 5a. The number of the light source parts 5a with which the light emission part 5 is provided is not limited to this. The number of the light source units 5a included in the light emitting unit 5 may be one or a plurality other than four.

  7 is a perspective view and an exploded perspective view of the light source unit 5a in the first embodiment. The right side in FIG. 7 is an exploded perspective view of the light source unit 5a, and the left side in FIG. 7 is a perspective view of the light source unit 5a in an assembled state. The light source unit 5a emits light upward in FIG. As shown in FIG. 7, the light source part 5a in this Embodiment is provided with the light emitting element 5d, the heat conductive material 5e, the 1st holder 5f, and the 2nd holder 5g.

  The light emitting element 5d in the present embodiment includes a light emitting diode (LED). The light emitting element 5d in the present embodiment is a chip-on-board (COB) type LED package. The light emitting element 5d is held by being sandwiched between the first holder 5f and the second holder 5g. The first holder 5f and the second holder 5g are fixed to the heat sink 6 in a state where the first holder 5f is in contact with the lower surface of the base portion 6a of the heat sink 6 via the heat conductive material 5e. The heat generated in the light emitting element 5d passes through the first holder 5f and the heat conductive material 5e and is thermally conducted to the base portion 6a of the heat sink 6. The heat conductive material 5e may be, for example, a heat conductive grease, a heat conductive sheet, a heat conductive adhesive, or a heat conductive double-sided pressure-sensitive adhesive tape.

  In the present invention, it is needless to say that the light emitting element 5d may not be a COB type LED package, and other various types may be used. For example, the light-emitting element 5d may be a surface-mounted LED package, a bullet-type LED package, an LED package with a light distribution lens, or an LED of a chip scale package. Further, the light emitting element 5d is not limited to the one provided with the LED, and may include, for example, an organic electroluminescence (EL) element, a semiconductor laser, or the like. A substrate (not shown) on which the light emitting element 5 d is mounted may be attached to the lower surface of the base portion 6 a of the heat sink 6. A substrate (not shown) on which the light emitting element 5d is mounted and the base portion 6a of the heat sink 6 may be integrally formed.

  In a lighting fixture attached to a ceiling or the like, the size of a required light beam varies depending on the height of the ceiling or the like. The illumination device 1A according to the present embodiment shown in FIGS. 1 and 2 can output twice as much light as the illumination device 100 shown in FIG. In the present embodiment, the power supply unit 4, the light emitting unit 5, the heat sink 6, the top plate unit 7, and the frame 8 can be shared between the lighting device 1 </ b> A and the lighting device 100. For this reason, the illuminating device from which a light beam class differs can be manufactured at low cost.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIG. 8 to FIG. 11. However, the difference from the first embodiment will be mainly described, and the description of the same or corresponding parts will be simplified or simplified. Omitted.

  FIG. 8 is a perspective view showing lighting apparatus 1B of the second embodiment. FIG. 9 is a top view showing the lighting apparatus 1B of the second embodiment, that is, a view seen from above. 10 and 11 are cross-sectional side views showing lighting device 1B of the second embodiment. 10 and 11 are views in which the lighting device 1B is cut along a plane parallel to the fins 6b of the heat sink 6. FIG. The arrow in FIG. 11 shows an example of airflow generated in the lighting device 1B.

  As shown in FIG. 8, the illuminating device 1B of Embodiment 2 is provided with one frame 8B instead of the two frames 8 included in the illuminating device 1A of Embodiment 1. The first lighting unit 2 and the second lighting unit 3 are held by the frame 8B. The frame 8B holds the light source unit 5a and the heat sink 6 of the first illumination unit 2, and the light source unit 5a and the heat sink 6 of the second illumination unit 3. If it is this Embodiment, rigidity can be made high by hold | maintaining the 1st illumination unit 2 and the 2nd illumination unit 3 with the one flame | frame 8B.

  As shown in FIG. 8, the illuminating device 1B of Embodiment 2 is provided with one top plate part 7B instead of the two top plate parts 7 with which the illuminating device 1A of Embodiment 1 is provided. The top plate portion 7 </ b> B corresponds to a combination of the top plate portion 7 of the first illumination unit 2 and the top plate portion 7 of the second illumination unit 3. If it is this Embodiment, rigidity can be made high by providing the top-plate part 7B in which the top-plate part 7 of the 1st illumination unit 2 and the top-plate part 7 of the 2nd illumination unit 3 were integrated. As shown in FIG. 9, the top plate portion 7 </ b> B includes a connecting portion 7 g that connects the top plate portion 7 of the first illumination unit 2 and the top plate portion 7 of the second illumination unit 3. The connecting portion 7g is formed on both sides of the ventilation portion 11 and the first inclined portion 7b. The top plate portion 7B is fixed to the frame 8B.

  In the second embodiment, the power supply unit 4 includes a plurality of fins 4d. The fin 4 d protrudes from the outer surface of the power supply unit 4. According to the present embodiment, since the power supply unit 4 includes the fins 4d, the outer surface area of the power supply unit 4 is increased, so that the power supply unit 4 can be cooled more favorably.

  As illustrated in FIG. 8, the illumination device 1 </ b> B according to the second embodiment includes a support member 13 instead of the support member 9 included in the illumination device 1 </ b> A according to the first embodiment. The support member 13 supports the frame 8B. The support member 13 includes a long hole 13a and a mounting surface 13b that are curved in an arc shape. The bolt 10 is tightened with respect to the screw hole of the frame 8B through the long hole 13a, whereby the support member 13 is fixed to the frame 8B. The support member 13 is fixed to the ceiling or the like with the attachment surface 13b in contact with the surface such as the ceiling. In the state of FIG. 8, the attachment surface 13 b is parallel to the flat portion 7 a of the top plate portion 7. When the surface such as the ceiling is horizontal, the lighting device 1B may be fixed to the surface such as the ceiling in the state of FIG. The support member 13 can also be fixed to the frame 8B in a posture in which the mounting surface 13b is inclined with respect to the flat portion 7a of the top plate portion 7. That is, after loosening the bolt 10 from the state of FIG. 3 and tilting the support member 13 so that the bolt 10 relatively moves along the long hole 13a, the bolt 10 is tightened again, so that the mounting surface 13b becomes the top plate. The portion 7 is inclined with respect to the flat portion 7a. When the surface such as the ceiling is inclined, the illumination device 1B can be installed at an appropriate angle by changing the angle of the support member 13 according to the inclination.

  As shown in FIG. 8, the top plate 7 includes a second inclined portion 7c, an opening 7h, and an opening 7i. The second inclined portion 7c is inclined with respect to the flat portion 7a. The opening 7h and the opening 7i are holes or gaps through which air can pass. Since air passes through the opening 7h and the opening 7i, the air around the heat sink 6 can flow more smoothly, and the heat dissipation effect of the heat sink 6 can be further improved. When viewed from above, the second inclined portion 7c and the opening 7h have an overlap. Thereby, the following effects are acquired. The air passing through the opening 7h flows along the second inclined portion 7c, so that the airflow can be smoothly guided. By receiving the dust, oil or the like falling from above the lighting device 1B by the second inclined portion 7c, it is possible to prevent the dust or oil from entering the heat sink 6 from the opening 7h.

  As shown in FIG. 10, at least a part of the plurality of fins 6b included in the heat sink 6 includes a first protrusion 6c and a second protrusion 6d that protrude outward from the outer edge of the base 6a. If it is this Embodiment, the following effects are acquired because the heat sink 6 is provided with the 1st protrusion part 6c and the 2nd protrusion part 6d. Since air at a position lower than the base portion 6a can easily flow into the periphery of the first protrusion 6c and the second protrusion 6d, the air around the fin 6b can flow more smoothly, and the heat dissipation effect by the heat sink 6 Can be improved more.

  As shown in FIG. 9, when viewed from above, at least some of the first protrusions 6c and the ventilation portions 11 have an overlap. As a result, the air heated by the heat of the first projecting portion 6 c becomes an ascending current and passes through the ventilation portion 11 and flows around the power source portion 4. As a result, the power supply unit 4 can be cooled better. In FIG. 9, the support member 13 is a cross-sectional view cut at an intermediate position. For this reason, the upper surface of the support member 13 does not appear in FIG.

  As shown in FIG. 10, the distance L <b> 1 between the base portion 6 a of the heat sink 6 of the first lighting unit 2 and the base portion 6 a of the heat sink 6 of the second lighting unit 3 is equal to or greater than the width L <b> 2 of the ventilation portion 11. It is desirable. By doing so, the following effects can be obtained. It is possible to reliably suppress dust or oil that has fallen from above the lighting device 1B and passed through the ventilation portion 11 from falling on the upper surface of the base portion 6a. Therefore, it is possible to more reliably suppress the accumulation of dirt on the upper surface of the base portion 6a. The flow of air passing through the gap between the base portion 6a of the heat sink 6 of the first lighting unit 2 and the base portion 6a of the heat sink 6 of the second lighting unit 3 can be sufficiently increased, and the heat dissipation effect by the heat sink 6 can be further improved.

  The opening 7i of the top plate portion 7 is located vertically above at least a part of the second protrusion 6d of the fin 6b. Thereby, the following effects are acquired. The air heated by the heat of the second protrusion 6d becomes a rising air current and passes through the opening 7i. For this reason, the air around the fin 6b can flow more smoothly, and the heat dissipation effect by the heat sink 6 can be further improved. It is possible to reliably suppress dust or oil that has fallen from above the lighting device 1B and passed through the opening 7i from falling on the upper surface of the base portion 6a. Therefore, it is possible to more reliably suppress the accumulation of dirt on the upper surface of the base portion 6a.

Embodiment 3 FIG.
Next, the third embodiment will be described with reference to FIG. 12. The description will focus on the differences from the second embodiment described above, and the description of the same or corresponding parts will be simplified or omitted.

  FIG. 12 is a perspective view showing a lighting apparatus 1C according to the third embodiment. The lighting device 1C of the third embodiment shown in FIG. 12 is one power supply unit 4 that supplies power to both the first lighting unit 2 and the second lighting unit 3 as compared with the lighting device 1B of the second embodiment. The point that the power supply unit 4 does not include the fins 4d, the point that the fins 6b of the heat sink 6 do not include the first protrusion 6c and the second protrusion 6d, the point that the top plate 7 does not include the opening 7i, The four points are different. The other points are the same as those in the second embodiment, and thus further explanation is omitted.

Embodiment 4 FIG.
Next, the fourth embodiment will be described with reference to FIG. 13. The difference from the second embodiment described above will be mainly described, and the description of the same or corresponding parts will be simplified or omitted.

  FIG. 13 is a perspective view showing a lighting apparatus 1D according to the fourth embodiment. The lighting device 1D of the fourth embodiment shown in FIG. 13 is one power supply unit 4 that supplies power to both the first lighting unit 2 and the second lighting unit 3 as compared with the lighting device 1B of the second embodiment. Are different from each other in that the fin 6b of the heat sink 6 does not include the first protrusion 6c and the second protrusion 6d, and the top 7 does not include the opening 7i. The other points are the same as those in the second embodiment, and thus further explanation is omitted.

1A, 1B, 1C, 1D lighting device, 2 first lighting unit, 3 second lighting unit, 4 power supply unit, 4a first site, 4b second site, 4c third site, 4d fin, 5 light emitting unit, 5a Light source part, 5b reflector, 5c cover glass, 5d light emitting element, 5e thermally conductive material, 5f first holder, 5g second holder, 6 heat sink, 6a base part, 6b fin, 6c first projecting part, 6d second projecting part Part, 7, 7B top plate part, 7a flat part, 7b first inclined part, 7c second inclined part, 7d, 7e boundary part, 7g connecting part, 7h, 7i opening part, 8, 8B frame, 9 support member, 9a 1st support part, 9b 2nd support part, 9c connection part, 10 bolt, 11 ventilation part, 12 support member, 12a length , 12b mounting surface, 13 support member, 13a long hole, 13b mounting surface, 100 illumination device

Claims (12)

A first lighting unit;
A second lighting unit adjacent to the first lighting unit;
A power supply for supplying power to the first lighting unit and the second lighting unit;
With
Each of the first lighting unit and the second lighting unit includes a light radiating portion that emits light downward, a heat sink on the back side of the light radiating portion, and a ceiling that entirely covers the heat sink. A plate portion,
Between the top plate portion of the first lighting unit and the top plate portion of the second lighting unit, there is a gap that becomes a ventilation portion,
The power supply unit is on a first part supported by the top plate part of the first lighting unit, a second part supported by the top plate part of the second lighting unit, and the ventilation part. A third part;
The distance L1 at which the base portion of the heat sink that each of the first lighting unit and the second lighting unit has is adjacent to the width L2 of the ventilation portion,
A lighting device comprising:   The lighting device according to claim 1, wherein the power supply unit and the ventilation unit intersect when viewed from above. The top plate portion includes a flat flat portion and a first inclined portion inclined with respect to the flat portion,
The lighting device according to claim 1, wherein the first inclined portion is at least partially below the power supply unit.   The lighting device according to claim 3, wherein the first inclined portion is inclined obliquely downward from a boundary portion with the flat portion.   The lighting device according to claim 3 or 4, wherein the power supply unit and the first inclined unit intersect when viewed from above. The top plate portion includes a flat flat portion, a second inclined portion inclined with respect to the flat portion, and an opening through which air can pass.
The illumination device according to any one of claims 1 to 5, wherein when viewed from above, the second inclined portion and the opening portion overlap each other.   The lighting device according to claim 1, wherein the heat sink includes a base portion and a plurality of fins protruding from an upper surface of the base portion.   The lighting device according to claim 7, wherein the top plate portion covers the entire base portion when viewed from above.   The lighting device according to claim 7 or 8, wherein at least some of the plurality of fins include a protruding portion protruding outward from an outer edge of the base portion.   The lighting device according to claim 9, wherein when viewed from above, at least a part of the protruding portion and the ventilation portion overlap each other.   The lighting device according to claim 9 or 10, wherein the top plate portion includes an opening portion vertically above at least a part of the protrusions.   The lighting device according to any one of claims 1 to 11, wherein the power supply unit includes a fin projecting on an outer surface thereof.

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