JP2018010868A - LED lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device which can be further reduced in weight.SOLUTION: The LED lighting device includes: a light source set which includes one or more sets of paired two light source units 7 comprising a plurality of LED elements; a power supply unit 5 which is provided between two light source units 7 constituting at least one pair of light source sets to supply lighting power to the LED elements. The light source unit 7 includes: an LED module 71 in which an LED element is mounted on an LED substrate; and a heat sink 72 in which the LED module 71 is mounted on its front surface and which includes fins on its back surface. The power consumption per LED element is set to 0.1 W or more and 1.0 W or less. The heat sink 72 has: a thin metal base plate 78 in which the LED module 71 is mounted on its surfaces; and a plurality of fins 79 which are provided on the back side of the metal base plate 78. The thickness of the fin 79 is thinner than the thickness of the metal base plate 78.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an LED lighting device using an LED element as a light source.

2. Description of the Related Art Conventionally, LED lighting fixtures for high ceilings that are attached to high ceilings such as multipurpose halls and gymnasiums and irradiate the floor surface below are known (for example, Patent Document 1). In this LED lighting fixture, the power supply unit is often arranged above the LED element (in the ceiling direction), and heat dissipation of the LED element may be hindered.
Then, as an illuminating device in which the heat dissipation of the LED element is not hindered, for example, an apparatus including a plurality of light source units including the LED element and a power supply unit that is provided between the plurality of light source units and supplies power to the LED element. It has been proposed (for example, Patent Document 2).

Japanese Patent No. 5793265 International Publication No. 2016/079900

Although the LED lighting device has improved heat dissipation, there is a problem that the entire device is heavy.
It is an object of the present invention to provide an LED lighting device that can be further reduced in weight.

The LED illumination device according to the present invention is provided between a light source set including one or more light source units each including a plurality of LED elements, and two light source units constituting at least one light source set. And a power supply unit for supplying lighting power to the LED element, wherein the light source unit includes an LED module in which the LED element is mounted on an LED substrate, and the LED module mounted on a surface thereof. A heat sink having fins on the back surface, power consumption per one of the LED elements is set to 0.1 W or more and 1.0 W or less, and the heat sink is a thin metal on which the LED module is mounted on the surface Having a base plate and a plurality of fins provided on the back side of the metal base plate;
The fins are thinner than the metal base plate.

  According to the said structure, the emitted-heat amount from a LED element can be suppressed. Thereby, the fin of a heat sink can be made thin and it can reduce as a whole.

It is a figure which shows the LED illuminating device of embodiment, (a) is the perspective view seen from the front side, (b) is the perspective view seen from the back side. It is the perspective view which looked at the decomposed | disassembled LED lighting apparatus from the front side. It is the perspective view which looked at the decomposed | disassembled LED lighting apparatus from the back side. It is sectional drawing of a LED lighting apparatus. It is a figure which shows the state with which the power supply unit was mounted | worn with the flame | frame, (a) is the perspective view seen from the front side, (b) is the perspective view seen from the back side. It is the perspective view which looked at the state which decomposed | disassembled the flame | frame and the power supply unit from the front side. It is the perspective view which looked at the state which decomposed | disassembled the flame | frame and the power supply unit from the back side. It is the figure which looked at the light source unit from the diagonal back side. It is the perspective view which looked at the state which decomposed | disassembled the light source unit from the front side. It is the perspective view which looked at the state which decomposed | disassembled the light source unit from the back side. It is a perspective view explaining attachment of a light source unit. It is a perspective view explaining attachment of a light source unit. It is a perspective view explaining the fin which concerns on a modification. It is a perspective view explaining the heat sink concerning a modification.

<Overview>
An LED lighting apparatus according to an aspect of an embodiment includes a light source set including one or more light source units each including a plurality of LED elements, and two light source units constituting at least one light source set. In the LED lighting device comprising a power supply unit that is provided in between and supplies lighting power to the LED element, the light source unit includes an LED module in which the LED element is mounted on an LED substrate, and the LED module on the surface. And a heat sink having fins on the back surface, the power consumption per one of the LED elements is set to 0.1 W or more and 1.0 W or less, and the LED module is mounted on the surface of the heat sink. It has a thin metal base plate and a plurality of fins provided on the back side of the metal base plate, and the thickness of the fins is Serial thin than the thickness of a metal base plate.
In the LED lighting device according to another aspect of the embodiment, the power supply unit includes a rectifier circuit that converts AC power, which is a received commercial power source, into DC power, and a non-insulated type that converts the rectified DC power into the lighting power. The power conversion unit, the rectifier circuit and the electronic components constituting the power conversion circuit are mounted on a circuit board, and the circuit board is parallel to the LED boards of the two light source units. It is arranged. Thereby, a power supply unit can be reduced in size and a thin LED illuminating device as a whole is obtained.
In the LED lighting device according to another aspect of the embodiment, the metal base plate includes a rectangular base portion on which the LED substrate is mounted, and a pair of side plate portions extending from the short side end of the base portion to the back side. The pair of side plate portions are attached to a frame on which the light source unit is attached and the light source unit. Thereby, a light source unit can be integrated easily.
In the LED lighting device according to another aspect of the embodiment, the pair of side plate portions includes a through hole and an inner flange portion projecting from the peripheral edge of the through hole toward the other side plate portion, and is attached to the frame. A screw portion for the screw body is provided on the inner peripheral surface of the inner flange portion. Thereby, a metal base board can be made thin.
In the LED lighting device according to another aspect of the embodiment, the metal base plate has one or a plurality of weight reducing portions. Thereby, weight reduction of a metal base board can be achieved.
In the LED lighting device according to another aspect of the embodiment, the fin has one or a plurality of weight reduction units. Thereby, weight reduction of a metal base board can be achieved.

<Embodiment>
1. Outline An LED illumination device (hereinafter simply referred to as “illumination device”) 1 according to an embodiment is a high-luminance type illumination device for a high ceiling that is attached to a high ceiling and irradiates a floor surface below.
As shown in FIGS. 1 to 4, the lighting device 1 includes a frame 3 having an attachment member 35 attached to a ceiling material, the power supply unit 5 and the light source unit 7 attached to the frame 3, and the front side of the frame 3. And a cover frame 9 for covering. The power supply unit 5 supplies lighting power to the light source unit 7. The side from which light is emitted from the light source unit 7 is the front side.
There are an even number of light source units 7, and there are one or a plurality of light source sets (here, one set). The power supply unit 5 is disposed between the pair of light source units 7 and 7. Here, when the light source units 7 and 7 and the power supply unit 5 are viewed from the front side, the respective shapes are rectangular, and the pair of light source units 7 and 7 and the power supply unit 5 are a pair of light source units 7 and 7. The power source unit 5 is disposed in the short direction of the light source unit 7 with the power source unit 5 sandwiched therebetween, and has a rectangular shape as a whole.
The longitudinal direction and the short direction of the light source unit 7 and the power supply unit 5 may be the longitudinal direction and the short direction of the lighting device 1, and may be simply referred to as “longitudinal direction” and “short direction”.
The configuration of each part will be described below.

2. Configuration of Each Part (1) Frame A description will be given mainly with reference to FIGS.
The frame 3 has a frame main body 31 that covers the power supply unit 5 and the light source units 7 and 7 from the back side, and an angle adjustable with respect to the frame main body 31 around a virtual axis (here, a virtual axis parallel to the longitudinal direction). And an attachment member 35 attached by screw bodies 33a and 33b (excluding FIGS. 6 and 7).

(1-1) Frame Main Body The frame main body 31 is formed by pressing a metal plate. As shown in FIGS. 6 and 7, a rectangular flat plate portion 311 for mounting the power supply unit 5 on the surface, and a flat plate Inclined plate portions 312 and 312 extending from both ends (long side end) in the short direction of the portion 311 to the oblique front side, and vertical plate portions 313 and 313 extending from the front end of each inclined plate portion 312 to the front side, The mounting plate portions 314 and 314 are attached to the mounting plate 35 so as to project from the center of both ends (short side end) in the longitudinal direction of the flat plate portion 311 and the both ends (short side end) of the flat plate portion 311 in the longitudinal direction. ) From the front side of each of the vertical plate portions 313 and bent toward the other vertical plate portion 313 facing each other. 316, 316.
The flat plate portion 311 has two recessed portions 311a and 311a which are recessed in the front side with a distance in the longitudinal direction. The power source unit 5 is mounted on the surface of the recessed portions 311a and 311a with a screw body 30a (FIG. 1). (See (a)), and between the recessed portions 311a and 311a, as shown in FIG. 6 and FIG. And the terminal outer cover 39 which covers the terminal inner cover 38 is attached. The terminal inner cover 38 is covered in a state of being in close contact with the terminal block 37, and the terminal outer cover 39 is covered in a state of being separated from the terminal inner cover 38. The terminal outer cover 39 is attached to the frame body 31 by a screw body 30b.
The inclined plate portion 312 and the vertical plate portion 313 are provided with air through grooves 312 a and 313 a for the light source units 7 and 7, and a through hole for attaching the light source unit 7 to the longitudinal end portion of the vertical plate portion 313. 313b is provided.

(1-2) Mounting member 35
The attachment member 35 is formed by pressing a metal plate, and as shown in FIGS. 6 and 7, a pair of attachment plate portions 351 and 351 extending to the front and back and attached to the attachment plate portion 314 of the frame body 31, It has a connecting plate portion 353 that connects the pair of mounting plate portions 351 and 351. The attachment member 35 has a “U” shape as a whole.

(2) Power Supply Unit This will be described with reference to FIGS.
As shown in FIGS. 6 and 7, the power supply unit 5 includes a power supply circuit (not shown) configured by mounting a plurality of electronic components on a circuit board, and a resin tray 51 that houses the circuit board of the power supply circuit. The resin tray 51 has a filling resin 53 filled therein, and a power supply box 55 that houses the resin tray 51 including a power supply circuit filled with the filling resin 53 and is attached to the frame main body 31.

(2-1) Power Supply Circuit The power supply circuit includes a rectifier circuit that converts received AC power, which is a commercial power supply, into DC power, and a booster circuit that converts the rectified DC power into power for the LED element 75 (power converter circuit). ). The power supply circuit here is a switched-on power supply using a non-transformer type as a booster circuit, a so-called non-insulated power supply. The non-insulated power supply here is a booster circuit, but may be a step-down circuit or a step-up / step-down circuit depending on the number of LED elements.
Thereby, the conversion efficiency as a circuit can be improved. If a choke coil is used instead of a transformer (non-insulated circuit), the entire circuit can be reduced in size.

(2-2) Resin Tray The resin tray 51 has a rectangular box shape with the front side opened, and the depth is such that most of the electronic components of the power supply circuit are filled with the filling resin 53. Thereby, since the electronic component with a possibility of an electric shock is sealed with the insulating filling resin 53 in the resin tray 51, safety can be improved. In addition, the heat generated by the electronic component can be conducted by the filling resin 53. As shown in FIG. 4, the circuit board 54 is accommodated in a state of being spaced from the bottom wall of the resin tray 51 and parallel to the bottom wall.

(2-3) Power Supply Box The power supply box 55 has a rectangular parallelepiped shape that is long in the longitudinal direction of the lighting device 1 as a whole. The power supply box 55 includes a box body 57 that is partially opened, and a lid body 59 that covers a release portion of the box body 57. The box body 57 is mounted with the resin tray 51 and the frame body 31. The lid 59 is attached to the box body 57 so as to cover the box body 57.

  The box main body 57 includes a rectangular base plate portion 571 and a pair of long side plate portions 573 and 573 extending from the long side end of the base plate portion 571 to the front side. As shown in FIG. 7, the base plate portion 571 includes a screw hole 571 a into which a screw body inserted through the through hole 51 b of the protruding portion 51 a on the short side wall of the resin tray 51 is screwed, or a flat surface of the frame body 31. A screw hole 571b into which a screw body 30a (see FIG. 1B) inserted through the through hole 311b of the recessed portion 311a of the plate portion 311 is screwed or a recessed portion 311a of the flat plate portion 311 of the frame body 31 It has the extending | stretching piece 571c inserted in the through-groove 311c.

In the pair of long side plate portions 573 and 573, the end portions 573a and 573a in the longitudinal direction have a shorter extension length (length in the front and back direction) than the intermediate portion 573b, and the front side ends of the end portions 573a and 573a are outside. The outer side bent portion 573c is bent inward, and the front end of the intermediate portion 573b is an inner bent portion 573d bent inward.
The lid 59 has a rectangular lid plate portion 591 facing the base plate portion 571 of the box body 57 and a pair of short side plate portions 593 and 593 extending from the short side end of the lid plate portion 591 to the back side. . The lid plate portion 591 is a through hole 591a for the screw body 50 (see FIG. 5A) that is screwed into the screw hole 573e of the inner bent portion 573d of the intermediate portion 573b of the long side plate portions 573 and 573 of the box body 57. have.

(3) Light Source Unit The light source unit will be described with reference to FIGS.
As shown in FIGS. 9 and 10, the light source unit 7 is emitted from an LED module 71 including a plurality of LED elements 75 as a light source, a heat sink 72 on which the LED module 71 is mounted, and the LED module 71. It has a reflector 73 that reflects light, and a translucent cover 74 that covers the LED module 71 and the reflector 73.

(3-1) LED Module The LED module 71 includes a plurality of LED elements 75 and an LED substrate 76 on which the plurality of LED elements 75 are mounted. The LED module 71 has a power receiving connector 77 on the LED substrate 76. The connector 77 is detachably connected to the connector of the electric cable 52 connected to the power supply unit 5 shown in FIGS.
The LED element 75 is a so-called “Middle Power” type in which power consumption per one at the time of rated lighting is set to 0.1 [W] or more and 1 [W] or less. The power consumption of one LED element 75 here is 0.2 [W].
By using a middle power type with high luminous efficiency as the LED element 75, the amount of heat generated by the entire LED element 75 can be suppressed, and a plurality of LED elements 75 can be mounted on the LED substrate 76 at a high density.

  Also, by suppressing the amount of heat generated by each LED element 75, a so-called sheet metal type fin 79 formed by press-molding a thin metal plate can be used. As a result, for example, the LED module support portion and the fin portion are integrated with a material having excellent thermal conductivity when a so-called High Power type LED element having a power consumption of 1 [W] or more is used. It is no longer necessary to use a thick heat sink (aluminum die-cast product), and a significant reduction in weight can be achieved.

  Here, the LED substrate 76 has a rectangular shape that is long in the longitudinal direction of the illumination device 1. The LED board 76 has a through hole 76a for passing the electric cable 52 at one end in the longitudinal direction. The connector 77 is provided on the surface near the through hole 76a. The LED board 76 is provided in parallel with the circuit board of the power supply circuit.

(3-2) Heat Sink The heat sink 72 includes a metal base plate 78 on which the LED module 71 is mounted, and a plurality of fins 79 provided on the back surface of the metal base plate 78. The metal base plate 78 and the fins 79 are configured by pressing a metal plate having a thickness of 5 mm or less. For this reason, the fin 79 can be said to be a sheet metal type fin. The material of the heat sink 72, that is, the metal base plate 78 and the fin 79 is aluminum.

(3-2-1) Metal Base Plate The metal base plate 78 is formed by press-molding a thin metal plate so that the cross-sectional shape is a “U” shape. The “thin wall” here refers to a thickness of 5 mm or less. The metal base plate 78 includes a rectangular base portion 781 corresponding to the shape of the LED substrate 76, and side plate portions 783 and 783 extending from the long side end of the base portion 781 to the back side.
The surface of the base portion 781 is also a module mounting portion on which the LED module 71 is mounted. The base portion 781 has a through hole 781 a for the electric cable 52.
Each of the pair of side plate portions 783 has a groove portion 783a that is recessed toward the other side and extends in the longitudinal direction at the approximate center of the side plate portion 783 in the short direction. That is, the side plate portion 783 has a groove portion 783a, a front side plate portion 783b positioned on the front side of the groove portion 783a, and a back side plate portion 783c positioned on the back side of the groove portion 783a. The front side portion at the end portion in the longitudinal direction of the side plate portion 783 is extended portions 783d and 783d extending to the back side so as to close the opening of the groove portion 783a. In the groove portion 783a, portions where the extended portions 783d and 783d exist are notched portions.
Note that since the metal base plate is formed by pressing the metal plate, the groove portion 783a and the like of the side plate portion 783 can be easily formed. In addition, since the metal base plate 78 is symmetric with respect to the center of the base portion 781 in the short direction, it is not necessary to consider the orientation of the metal base plate 78 when mounting.

  The pair of side plate portions 783 has screw holes 783g for attaching the light source unit 7 to the frame 3 in the back side plate portion 783c, and screw holes 783f for attaching the cover frame 9 to the light source unit 7. . The screw holes 783g and 783f are formed by burning. That is, the screw holes 783g and 783f each have a through hole and an inner flange portion extending from the periphery of the through hole to the side where the other side plate portion 783 is present, and the inner peripheral surface of the inner flange portion is a screw portion. It has become. Thereby, a screw hole can be lengthened and the light source unit 7 and the cover frame 9 can be fixed firmly. Moreover, the thickness of the metal base board 78 can be made thin by using a burning process for the screw holes 783f and 783g.

(3-2-2) Fins The fins 79 here are, for example, a combination of a first fin 791 and a second fin 793 that are formed by pressing a metal plate and having a cross-sectional shape of “L”. The cross section has a "U" shape. Note that the first fin 791 and the second fin 793 are referred to as “first” and “second” for convenience, and there is no particular reason to set one of them as “first”.
As shown in FIG. 8, the first fin 791 and the second fin 793 are orthogonal to the fin portions 791 a and 793 a from the front ends of the fin portions 791 a and 793 a extending in the longitudinal direction. And connecting portions 791b and 793b extending in the direction to be connected. The connecting portions 791 b and 793 b have a rectangular shape that is long in the longitudinal direction, and are connected to the metal base plate 78. Here, in the first fin 791 and the second fin 793, the sizes of the connecting portions 791b and 793b are substantially the same, and the lengths of the fin portions 791a and 793a may be the same or different. Those having the same length are the fins 79A, and those having different lengths are the fins 79B. Note that through holes 791d and 793d for the electric cable 52 are provided in the connecting portions 791b and 793b of the fin 79A.

(3-3) Reflector The reflector 73 has a rectangular frame shape that is long in the longitudinal direction of the lighting device 1 so as to surround the entire plurality of LED elements 75 of the LED module 71. The reflector 73 has an inclined surface that spreads outward as the inner peripheral surface moves away from the LED substrate 76 to the front side. This inclined surface is a reflecting surface 73a. The reflector 73 is attached to the metal base plate 78.
The reflector 73 has reinforcing ribs 73c extending on the front and back sides. Thereby, the mechanical characteristics as the light source unit 7 can be ensured, and the metal base plate 78 can be thinned.

(3-4) Translucent Cover The translucent cover 74 includes a cover main body 741 that has a shallow, substantially rectangular box shape that is open on the back side. The cover main body 741 covers the reflector 73. In other words, the reflector 73 is accommodated inside the cover main body 741. The outer flange portion 743 contacts the base portion 781 of the metal base plate 78 when the translucent cover 74 is attached to the metal base plate 78.
The cover main body 741 has a longitudinal end portion, a central portion, and a concave portion on the long side wall, and has a through hole 741a on the bottom wall thereof. The screw body 70 inserted through the through hole 741a from the front side is inserted through the through hole 73b of the reflector 73 and the through hole 76b of the LED substrate 76 and screwed into the screw hole 781c of the base portion 781 of the metal base plate 78. Thereby, the LED module 71, the heat sink 72, the reflector 73, and the translucent cover 74 are assembled integrally.

(3-5) Mounting on the frame side (mounting)
An outline of mounting the light source unit 7 on the frame 3 will be described with reference to FIGS.
The light source unit 7 is attached so as to straddle the frame main body 31 and the power supply unit 5 attached to the frame main body 31. Specifically, groove portions 783 a and 783 a provided in the pair of side plate portions 783 of the metal base plate 78 of the light source unit 7 are provided in the bent plate portion 316 of the frame body 31 and the power supply box 55 of the power supply unit 5. The screw body 80 is inserted into the through hole 313b provided in the vertical plate portion 313 of the frame main body 31 while being engaged with the outer bent portion 573c, and is provided in the side plate portion 783 of the light source unit 7. The screw hole 783g is screwed.

A method for mounting the light source unit 7 will be described with reference to FIGS. 11 and 12.
With respect to the frame 3 with the power supply unit 5, the groove portions 783 a and 783 a of the light source units 7 are connected to the outer bent portion 573 c of the power supply unit 5 and the bent plate portion 316 of the frame body 31 on the outer side in the longitudinal direction of the frame 3. Align and slide in the longitudinal direction. FIG. 11 is a diagram showing a state during the slide.
Thereby, the groove portions 783a and 783a, the bent plate portion 316 of the frame main body 31, and the outer bent portion 573c of the power supply unit 5 are engaged. At this time, the back surface of the bent plate portion 316 of the frame main body 31 and the back surface of the outer bent portion 573c of the power supply unit 5 are in contact with the surface of the plate portion located on the back side constituting the groove portions 783a and 783a. The unit 7 can be easily slid.

  At this time, the light source unit 7 has extended portions 783d at both ends in the longitudinal direction of the groove portion 783a, and the outer bent portion 573c of the power supply unit 5 has an "L" shape that curves to the front side. If 573c is locked to one extending portion 783d in the longitudinal direction (see FIG. 11A), it is possible to prevent the light source unit 7 from coming off during sliding. The outer bent portion 573c of the power supply unit 5 exists only at both ends in the longitudinal direction, but the outer bent portion 573c has a length of 30 [mm] or more in the longitudinal direction, and the bent plate of the frame body 31 The light source unit 7 can be easily slid because the portion 316 exists over the entire length in the longitudinal direction and the back wall constituting the groove portion 783a and the extended portion 783d are narrow.

  Further, the light source unit 7 is slid to engage the groove portions 783a and 783a with the other outer bent portion 573c in the longitudinal direction of the power supply unit 5, as shown in FIG. Thereby, it can prevent that the light source unit 7 remove | deviates from the groove part 783a.

(4) Cover frame The cover frame will be described mainly with reference to FIGS.
The cover frame 9 has a shallow, substantially square box shape whose back side is open. From the sides of the cover plate portion 91 and the rectangular cover plate portion 91 that covers the power supply unit 5 and the light source units 7 and 7 except for the light emitting portion of the light source unit 7 (that is, the translucent cover 74). And side plate portions 92, 92, 93, 93 standing on the back side.
The cover plate portion 91 has two rectangular openings 91a and 91a corresponding to the portion where the translucent cover 74 exists. The side plate portions 92, 92 are side plate portions extending in the short direction of the rectangular openings 91a, 91a. The side plate portions 93 and 93 are side plate portions extending in the longitudinal direction of the openings 91a and 91a. The side plate portions 93 and 93 are attached to the metal base plate 78 of the pair of light source units 7 and 7 incorporated in the frame 3. That is, the screw body 90 (see FIG. 1) that passes through the through hole 93 a of the side plate portion 93 is screwed into the screw hole 783 f of the front side plate portion 783 b of the metal base plate 78.

Each embodiment has been described above. However, the present invention is not limited to this embodiment. For example, the following modification may be used. Further, the embodiment may be a combination of the modified example and the modified examples.
In addition, examples that are not described in the embodiments and modifications, and design changes that do not depart from the gist are also included in the present invention.

<Modification>
1. Fins The fin 79 according to the embodiment is configured in a “U” shape by combining two “L” -shaped metal plates, but the “L” -shaped metal plate may be a fin. Note that the “U” shape can increase the number of fins per unit area as compared to the “L” shape.
Further, by using one or two metal plates, an inverted “U” shape, an inverted “V” shape, a “W” shape, a bellows shape (triangular wave shape, sine wave shape), or the like may be used.
The fins 79 extend along the longitudinal direction with respect to the rectangular metal base plate 78 and are spaced apart in the lateral direction. For example, the fins 79 extend along the lateral direction and are spaced apart in the longitudinal direction. It may be provided. However, the number of man-hours attached to the metal base plate can be reduced by providing fins extending in the longitudinal direction and spaced in the lateral direction.
The height of the plurality of fins 79 may be the same or different. The material of the plurality of fins 79 may be the same or different.
The fin 79 according to the embodiment does not have a through-hole penetrating in the thickness direction other than the through-hole for mounting. For example, as shown in FIG. And a fin 179 having a U-shaped cross section. Thereby, weight reduction of the fin 179 can be achieved. The number of through holes is preferably larger from the viewpoint of weight reduction, but is preferably smaller from the viewpoint of heat dissipation. Therefore, the number of through holes is preferably provided in consideration of weight reduction and heat dissipation.

The shape of the through hole is not particularly limited. For example, the shape of the through hole may be a circular shape as shown in FIG. 13, an elliptical shape, an oval shape, a polygonal shape such as a triangle, a slit shape, or a combination of these. .
The size of the through hole is not particularly limited. However, the size of the through hole is preferably larger from the viewpoint of weight reduction, and smaller from the viewpoint of heat dissipation. Therefore, the size of the through hole is preferably provided in consideration of weight reduction and heat dissipation.
When providing a plurality of through holes, the sizes and shapes of all the through holes may be the same or different, and the sizes and shapes of the plurality of through holes may be provided in a plurality of types. . For example, the size may be gradually changed from the first side of the fin to the second side (for example, the longitudinal direction or the stretching direction), or the shape may be gradually changed from a square to a circle. Alternatively, it may be symmetric with respect to the middle between the first side and the second side.

  When providing a plurality of through holes, the arrangement of the through holes is not particularly limited. In the example shown in FIG. 13, the plurality of through holes 179a are arranged in a staggered manner in the longitudinal direction and the short direction of the opposing plate portions. When the fins are formed in a “U” shape, the through holes provided in the opposing plate portions may or may not face each other.

Further, the fin 179 shown in FIG. 13 has the through hole 179a. However, from the viewpoint of weight reduction, the fin 179 may be a fin having one or a plurality of dents with a reduced thickness. In this case, the weight reduction effect is reduced, but the heat dissipation is maintained.
Thus, from the viewpoint of weight reduction, any hole, groove, dent, or the like (which can also be referred to as a “weight reduction portion”) that can reduce the weight of the fins may be used. Note that the same can be said for the size, arrangement, shape, and the like.

2. Metal base plate The heat sink 72 according to the embodiment does not have a through-hole penetrating in the thickness direction other than the mounting through-hole. For example, as shown in FIG. The heat sink 272 may include a metal base plate 278 having a plurality of through holes 276a and 277a and fins 279 having the through holes 279a. The through hole is an example of a weight reducing portion, and the through hole 279a of the fin 279 is as described in the above item “1. Fin”.

As shown in FIG. 14, the metal base 278 has a base portion 276 and a side plate portion 277. The base portion 276 has a plurality of circular through holes 276a, and the plurality of through holes 276a are arranged in a matrix.
The side plate portion 277 has a plurality of circular through holes 277 a in the back side plate portion 275 and the extended portion 274. The through hole 277a of the back side plate portion 275 is provided along the longitudinal direction.
It can be said that the shape, size, and arrangement of the through holes of the metal base 278 are the same as described in the above item “1. Fin”.

3. Heat sink Since the heat sink 72 according to the embodiment uses a thin metal plate, the weight can be reduced.
The thickness of the fin 79 is preferably 0.2 [mm] or more and 1.2 [mm] or less, and preferably 0.3 [mm] or more and 0.8 [mm] or less. This is because if the thickness of the fin 79 is smaller than 0.2 [mm], it is difficult to attach the fin 79 to the metal base plate 78. This is because if the thickness of the fin 79 is greater than 1.2 [mm], the effect of reducing the weight cannot be obtained.
The thickness of the metal base plate 78 is preferably 1.0 [mm] or more and 3.0 [mm] or less. This is because if the metal base plate 78 is smaller than 1.0 [mm], it is difficult to attach the fins 79. This is because if the metal base plate 78 is larger than 3.0 [mm], the effect of reducing the weight cannot be obtained. The metal base plate 78 is preferably at least twice the thickness of the fin 79.
The metal base plate 78 and the fins 79 are preferably aluminum. In particular, pure aluminum is more preferable than aluminum alloy from the viewpoint of heat dissipation.

  As described above, the heat sink 72 according to the embodiment does not have a through hole penetrating in the thickness direction other than the through hole for mounting. However, the weight reduction is provided by providing the metal base and the fin with a weight reducing portion. Can be achieved. For this reason, for example, at least one of the metal base and the fin may be made of an iron material to reduce the cost. However, by using an iron material, the metal base and fins are heavier than a heat sink composed of aluminum, but an increase in weight can be suppressed by providing a weight reduction unit.

4). Power Supply Circuit The power supply circuit according to the embodiment uses a non-insulated power supply, but may be a so-called isolated power supply using a transformer, for example. In this case, the entire circuit becomes larger than the non-insulated power source and the conversion efficiency tends to decrease, but it is possible to ensure higher safety than the non-insulated power source at the time of failure. The insulated power supply may be any one of a booster circuit, a step-down circuit, and a step-up / down circuit.

DESCRIPTION OF SYMBOLS 1 Illuminating device 3 Frame 5 Power supply unit 7 Light source unit 71 LED module 72 Heat sink 75 LED element 76 LED board 78 Metal base plate 79 Fin 781 Base part 783 Side plate part

Claims (6)

A light source set including one or more light source units each including a plurality of LED elements and a light source set provided between two light source units constituting at least one light source set to provide lighting power to the LED elements. In an LED lighting device comprising a power supply unit to supply,
The light source unit is
An LED module in which the LED element is mounted on an LED substrate;
A heat sink having the LED module mounted on the front surface and fins on the back surface;
The power consumption per one of the LED elements is set to 0.1 W or more and 1.0 W or less,
The heat sink has a thin metal base plate on which the LED module is mounted on the surface, and a plurality of fins provided on the back side of the metal base plate,
The thickness of the fin is thinner than the thickness of the metal base plate. The power supply unit includes a rectifier circuit that converts AC power that is received commercial power into DC power, and a non-insulated power converter circuit that converts rectified DC power into the lighting power,
In the power supply unit, electronic components constituting the rectifier circuit and the power conversion circuit are mounted on a circuit board,
The LED lighting device according to claim 1, wherein the circuit board is arranged in parallel with the LED boards of the two light source units. The metal base plate has a rectangular base portion to which the LED substrate is mounted, and a pair of side plate portions extending from the short side end of the base portion to the back side,
The LED lighting device according to claim 2, wherein the pair of side plate portions are attached to a frame on which the light source unit is attached and the light source unit. The pair of side plate portions includes a through hole and an inner flange portion projecting from the peripheral edge of the through hole toward the other side plate portion, and a screw portion for a screw body to be attached to the frame is the inner flange. It is provided on the inner peripheral surface of the part.
The LED lighting device according to claim 3. The LED lighting device according to claim 1, wherein the metal base plate has one or a plurality of weight reduction units. The LED lighting device according to any one of claims 1 to 5, wherein the fin has one or a plurality of weight reduction units.

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