KR101072598B1 - Led lighting apparatus - Google Patents

Abstract

The present invention is to provide an LED illuminating device that provides a uniform illuminance to the ground, further enhances the heat dissipation effect, and improves the stability, and is provided on a flat plate and provided on a side opposite to the first plane and the first plane. A panel having a two planes, a light emitting surface formed on the first plane of the panel and including a plurality of LED elements and having a light emitting surface parallel to the first plane, the light emitting surface being inclined at an acute angle with respect to the ground; And a reflecting plate extending from the panel, wherein the reflecting plate includes a first portion extending inclined to have a second angle smaller than the first angle with respect to the ground, and inclined with respect to the ground. The present invention relates to an LED lighting device including a second portion extending in a direction away from the ground, and a third portion connecting the first portion and the second portion.

Description

LED lighting apparatus {LED lighting apparatus}

The present invention relates to an LED lighting device, and more particularly to a LED lighting device more suitable for use as a street lamp.

Light emitting diodes (LEDs) are being used in various lighting devices as next generation light sources to replace fluorescent lamps.

These LEDs should be considered both in the external environment, especially in streetlights, and in the constant illumination of the ground.

When the high-wattage LED is used to increase the illuminance of the ground when the street lamp is formed using the LED element, there is a problem in that the LED element is deteriorated by heat emitted from the LED element, which shortens the life of the LED element. Cause In addition, when the heat of the LED element is not effectively discharged to the outside, the temperature of the entire lighting device is raised, which not only adversely affects the electrical components such as the ballast mounted therein, but also affects the front of the LED element due to external impact. There is a fear that the protective material of the tempered glass material disposed on the easily breaks.

The present invention has been made to solve the above problems and / or limitations, and an object of the present invention is to provide an LED lighting device that can give a uniform illuminance to the ground.

Another object of the present invention is to provide an LED lighting device which further improves the heat dissipation effect and improves stability.

In order to achieve the above object, the present invention provides a panel having a flat surface and having a second plane provided on a side opposite to the first plane and the first plane, and formed on the first plane of the panel, And a light emitting part having a light emitting surface parallel to the first plane, the light emitting surface being inclined at a first angle at an acute angle with respect to the ground, and a reflecting plate extending from the panel, wherein the reflecting plate is disposed on the ground. A first portion extending inclined to have a second angle smaller than the first angle with respect to the first portion, a second portion extending from the panel and extending in a direction away from the ground inclined with respect to the ground, the first portion and the second portion It provides an LED lighting device comprising a third portion for connecting.

According to another feature of the invention, the shortest distance between the light emitting surface and the ground may be shorter than the shortest distance between the first portion and the ground.

According to another feature of the invention, the first angle may be less than half of the viewing angle of the LED device.

According to another feature of the invention, the third portion may include a portion parallel to the ground.

According to another feature of the invention, the chassis plate is provided with a material coupled to the second plane of the panel and capable of transferring heat generated from the panel, and a plurality of heat dissipation fins provided on the opposite side of the panel of the chassis plate It may include.

According to another feature of the invention, the case is coupled to the chassis plate and includes a case having a space for accommodating the heat dissipation fin, the case may be provided with a plurality of vent holes penetrating the space.

According to still another feature of the present invention, the vent hole may include a plurality of first vent holes penetrating toward the ground and a plurality of second vent holes formed at a position higher than the first vent hole.

According to another feature of the present invention, the sum of the areas of the first through holes may be larger than the sum of the areas of the second through holes.

According to another feature of the invention, it may further include a diffusion plate disposed to face the light emitting portion and the reflecting plate.

According to still another feature of the present invention, the diffusion plate has a third plane facing the light emitting portion and the reflecting plate, and a fourth plane opposite to the third plane, and on the third plane or the fourth plane. A plurality of first grooves provided to be spaced apart from each other, and a plurality of second grooves provided to be spaced apart from each other on the third plane or the fourth plane and provided to intersect the first grooves, and the first grooves and the second grooves. The grooves may be provided to be spaced apart from each other.

According to the present invention made as described above, it is possible to provide an LED lighting device that can give a uniform illuminance to the ground.

In addition, the light efficiency can be maximized to achieve uniform illuminance to the ground, thereby enabling the use of low-power LED devices, which can reduce costs and reduce power consumption.

In addition, it is possible to prevent the lifespan of the LED device from being shortened by preventing the temperature of the light emitting unit from being increased by maximizing heat radiation efficiency using convection.

1 is a schematic diagram of a street lamp to which an LED lighting device according to an embodiment of the present invention may be applied;
2 is a cross-sectional view of the LED lighting apparatus according to an embodiment of the present invention,
3 is a schematic cross-sectional view showing in detail the structure of a panel, a reflector and a light emitting part of an LED lighting apparatus according to an embodiment of the present invention;
4 is a schematic diagram schematically showing a state of light divergence when the LED lighting device according to FIG. 3 is applied to a street lamp;
FIG. 5 is a schematic diagram schematically illustrating a state in which light is emitted when the LED lighting apparatus according to FIG. 3 is applied to a street lamp; FIG.
6 is a schematic cross-sectional view showing in detail the structure of a panel, a reflector and a light emitting part of an LED lighting apparatus according to another embodiment of the present invention;
7 is a bottom perspective view of an LED lighting apparatus according to another preferred embodiment of the present invention;
8 is a partial perspective view showing an example of a diffusion plate of the LED lighting apparatus according to another embodiment of the present invention,
9 is a partial perspective view showing another example of a diffusion plate of the LED lighting apparatus according to another embodiment of the present invention,
10 is a plan view illustrating an example of a pattern of first grooves and second grooves of a diffusion plate;
11 is a plan view illustrating another example of a pattern of first grooves and second grooves of a diffusion plate;
12 is a plan view illustrating another example of a pattern of first grooves and second grooves of a diffusion plate;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a street lamp according to one embodiment to which an LED lighting device of the present invention is applied.

Street lamps arranged along the driveway and / or sidewalk have a structure in which the LED lighting device 2 is installed on the pillars 1 arranged at regular intervals along the ground 3 as shown in FIG. 1.

At this time, the LED lighting device (2) installed on each pillar (1) has to be uniform illuminance with respect to the ground (3) where the light is shining in a state overlapped to some extent from each LED lighting device (2) It is preferable to make the irradiated light show the form which spreads in the shape of a seagull wing.

2 shows an LED lighting device 2 according to a preferred embodiment of the present invention. FIG. 3 is a schematic diagram for illustrating the relationship between the light emitting portion 22 and the reflecting plate 23 of the LED lighting apparatus 2 of FIG. 2.

2 and 3, the LED lighting device 2 includes a panel 21, a light emitting unit 22, and a reflecting plate 23.

The panel 21 is provided in a flat plate shape and has a first plane 211 and a second plane 212 provided on an opposite side of the first plane 211.

The panel 21 may be a printed circuit board (PCB), preferably a metal PCB. The panel 21 may be a plate-shaped body having a rectangular surface.

The light emitting part 22 is formed on the first plane 211 of the panel 21.

The light emitting unit 22 may be configured by mounting a plurality of LED elements on a pad formed on the first plane 211 of the panel 21. The LED elements may be covered by a sealing material including a phosphor.

The light emitting portion 22 has a light emitting surface 221 on the surface, the light emitting surface 221 is a surface substantially parallel to the first plane 211.

Light is emitted from the light emitting surface 221 of the light emitting part 22 toward the space opposite to the first plane 211 of the panel 21.

The light emitting part 22 is disposed to be inclined upwardly so that the light emitting surface 221 has a first angle a1 that is an acute angle with respect to the ground. Therefore, if the light emitting surface 221 is completely parallel to the first plane 211 of the panel 21, the first plane 211 of the panel 21 will also have a first angle a1 with respect to the ground. .

The reflecting plate 23 extends from the panel 21. As shown in FIG. 3, the reflector 23 includes first portions 231 to third portions 233.

The first portion 231 corresponds to a portion of the reflective plate 23 disposed farthest from the light emitting portion 22. The second portion 232 corresponds to a portion extending from the panel 21, and the third portion 233 corresponds to an intermediate portion connecting the first portion 231 and the second portion 232.

The first portion 231 extends inclined upwardly to have a second angle a2 with respect to the ground 3. In this case, the second angle a2 is smaller than the first angle a1.

When the first angle a1 of the light emitting surface 221 with the ground 3 becomes larger than the second angle a2 of the first portion 231 with the ground 3, the light emitting surface 221 is separated from the light emitting surface 221. Not only is the amount of light directly irradiated toward the ground 3 increased, but some of the light irradiated from the light emitting surface 221 is reflected by the reflecting plate 23 so that the surface 3 is radiated from the light emitting surface 221. It is possible to further increase the illuminance on the ground 3 to which light is irradiated by overlapping light directly irradiated toward).

The second angle a2 may be set in a range of 10 to 60 degrees. When the second angle a2 exceeds 60 degrees, the light emitting surface is compared with the illuminance of light at a position far from the light emitting surface 221. Roughness of the portion close to 221 may be increased, so that it may be difficult to obtain a uniform illuminance as a whole, and when the second angle a2 is smaller than 10 degrees, the amount of reflection by the reflector 23 is lowered so as to reduce the overall illuminance. You can drop it.

The shortest distance t1 between the light emitting surface 221 and the ground 3 may be shorter than the shortest distance t2 between the first portion 231 and the ground 3. In this case, the amount of light directly irradiated toward the ground 3 of the light emitted from the light emitting surface 221 is larger than the amount of light reflected by the reflector 23 so that irradiation in a wider range is possible. Can be.

On the other hand, one embodiment of the LED light emitting device 2 of the present invention can be used in a dual structure having the same panel 21, the light emitting portion 22 and the reflecting plate 23 on both sides, as shown in FIG. This is more advantageous when it is necessary to irradiate light toward both sides about the pillar 1 as in the street lamp of FIG.

In this case, the first angle a1 may be equal to or less than half the viewing angle b of the LED device mounted on the light emitting part 22. Therefore, when the LED device having a viewing angle of 120 degrees is used, the first angle a1 may be smaller than 60 degrees. In the dual structure having the panel 21, the light emitting part 22, and the reflecting plate 23 on both sides, as shown in FIG. 4, this ensures sufficient illuminance of the portion immediately below the two light emitting parts 22 in the ground 3. It is for. When the first angle a1 is equal to half of the viewing angle b of the LED element, the light of the light emitting portion 22 is irradiated directly, and since the distance between the two light emitting portions 22 is narrow, the ground 3 Sufficient brightness may be maintained even in a portion directly under the two light emitting parts 22. When the first angle a1 is smaller than half of the viewing angle b of the LED device, since the light of the two light emitting parts 22 overlaps with each other to some extent, at the portion immediately below the two light emitting parts 22 of the ground 3. Sufficiently bright state can be maintained.

If the LED light emitting device 2 of the present invention is installed in a place where the wall surface 31 is located as shown in FIG. 5, the first angle a1 is the viewing angle b of the LED element mounted on the light emitting part 22. Slightly larger than half. That is, in this case, it is necessary to irradiate a portion of the ground 3 adjacent to the wall surface 31, and the first light is to be emitted from a position spaced a certain distance from the wall surface 31. The angle a1 may be slightly larger than half of the viewing angle b of the LED device mounted on the light emitting unit 22. When the first angle a1 is too large than half of the viewing angle b of the LED device, the direct light of the light emitting part 22 becomes too dark. In this case, the first angle a1 is the viewing angle of the LED device. It is desirable to be greater than the half of b) or greater than 10 degrees than the half of the viewing angle b of the LED element.

On the other hand, the second portion 232 may extend inclined upward at a third angle (a3) with respect to the ground (3). The third angle a3 may be set within a range of 10 to 60 degrees with respect to the ground. When the third angle a3 exceeds 60 degrees, the shape of the reflective surface 23 becomes too convex, The illuminance of the portion closer to the light emitting surface 221 may be higher than the illuminance of the light at a position far from the light emitting surface 221, so that it may be difficult to obtain a uniform illuminance as a whole. In addition, when the third angle a3 is smaller than 10 degrees, the shape of the reflecting surface 23 becomes too flat, so that the amount of reflection by the reflecting plate 23 can be lowered and the overall roughness can be reduced.

The third portion 233 is a portion connecting the second portion 232 and the first portion 231 to each other in a curved shape so that light is reflected at various angles to produce a uniform illuminance toward the ground 3. Can be formed.

As shown in FIG. 3, the reflecting plate 23 according to the exemplary embodiment of the present invention may be formed in a curved shape as a whole. In this case, the third part 233 may be formed of a sieve and a first part of the curved surface. 231 and / or the second portion 232 may be formed in a straight line.

In addition, as shown in FIG. 6, all of the first portion 231 to the third portion 233 may be formed in a straight line. In this case, the third portion 233 may be parallel to the ground.

Meanwhile, referring to FIGS. 2 and 3, in the LED light emitting device 2 according to the preferred embodiment of the present invention, the chassis plate 24 may be further coupled to the second plane 212 of the panel 21. have. The chassis plate 24 is preferably made of a metal material so as to transfer heat generated from the panel 21, and may be formed of Al or an Al alloy.

The chassis plate 24 may include a first support part 241 supporting the panel 21 and a second support part 242 supporting the reflector plate 23. The first support part 241 and the second support part 242 may be provided. The support part 242 may be integrally formed.

Although not shown in the drawings, a heat transfer sheet may be further interposed between the first support part 241 and the panel 21. The heat emitted from the light emitting part 22 by the heat transfer sheet can be more effectively transferred to the first support part 241 via the panel 21, thereby improving the heat dissipation effect of the light emitting part 22. It becomes possible.

A plurality of heat dissipation fins 25 may be provided on the side opposite to the panel 21 of the chassis plate 24, and the heat dissipation fins 25 may be installed in the first support part 241, so that the first heat dissipation fins 25 may be installed. By helping the heat dissipation of the support part 241, the heat dissipation effect of the light emitting part 22 may be further maximized. Since it is located at the shortest distance from the light emitting part 22, the heat radiation effect can be improved by that much.

The case may be further coupled to the chassis plate 24 as described above. According to an exemplary embodiment of the present invention as shown in FIGS. 2 and 7, the case may include a first case 261 connected to the first support part 241 and a second case connected to the second support part 242. 262).

When the LED lighting device 2 of the present invention is installed outside, it may be easily damaged by weather conditions such as rain or the like, animals such as birds or squirrels, or leaves, and the case may emit light 22 from such an external environment. ), The panel 21, the heat dissipation fins 25, etc. can be protected, and many electrical devices not shown in the figure can be protected.

The space part 263 is formed therein by the first case 261 and the second case 262. A pipe 28 may be installed in the space 263, and various pipes connected to the panel 21 may pass through the pipe 28.

The first case 261 and the second case 262 may further be formed with a plurality of through-holes through the space portion 263, the above-described heat radiation fin 25 is the space portion 263 It is preferred to extend toward. Therefore, the heat dissipated through the heat dissipation fins 25 may be effectively discharged to the outside through the air hole through the space portion 263.

In order to effectively discharge the heat of the space portion 263, the inventors used convection of air. That is, as shown in FIGS. 2 and 7, a plurality of first vent holes 271 penetrating toward the ground are formed in the first case 261, and a plurality of second vent holes are formed in the second case 262. 272 is formed. At this time, the second vent 272 is to be formed at a higher position from the ground than the first vent 271. Accordingly, when the cool air introduced into the space 263 from the first vent 271 becomes hot after heat exchange with the heat dissipation fin 25 and the first support 241, the air is discharged through the second vent 272. It is to be possible. By the convection effect, the heat dissipation effect of the above-described heat dissipation fin 25 and the first support 241 may be further maximized.

According to another embodiment of the present invention, the sum of the areas of the first through holes 271 may be larger than the sum of the areas of the second through holes 272. In this case, since the amount of cold air introduced from the first vent hole 271 increases, the above-described convection effect can be further maximized.

The second vent hole 272 may be formed on the side surface 262a of the second case 262 as shown in FIG. 7, and may be formed on the upper surface of the second case 262 as shown in FIG. 2. In this case, since foreign matter is easily introduced from the outside, the second vent hole 272 is clogged or the space 263 is easily contaminated. However, the present invention is not necessarily limited thereto, and although not shown in the drawings, the second vent hole 272 may be formed on the upper surface of the second case 262.

Meanwhile, the diffusion plate 29 may be further disposed to face the light emitting part 22 and the reflecting plate 23. As shown in FIG. 2, the diffusion plate 29 may be installed on the chassis plate 24, and may be coupled to an edge of the first support 241 and an edge of the second support 242.

The diffusion plate 29 may not only directly protect the light emitting unit 22, the reflecting plate 23, and the panel 21 from the external environment, but also diffuse the light emitted from the light emitting unit 22 to the ground. Ensure high and even illumination.

The diffusion plate 29 may be formed of a material that diffuses light as the material itself, or may diffuse light using a transparent panel in which scattering particles are dispersed.

In addition, the diffusion plate 29 has a third plane 291 facing the light emitting portion 22 and the reflecting plate 23 and a fourth plane 292 opposite to the third plane 291. And a plurality of first grooves provided to be spaced apart from each other on the third plane 291 or the fourth plane 292, and spaced apart from each other on the third plane 291 or the fourth plane 292. It includes a plurality of second grooves provided to cross the first grooves, the first grooves and the second grooves may be provided to be spaced apart from each other.

8 illustrates one embodiment of such a diffuser plate 29.

In the embodiment according to FIG. 8, a plurality of first grooves 293 are provided on the fourth plane 292 to be spaced apart from each other, and a plurality of second grooves 294 are provided to be spaced apart from each other. The second grooves 294 are arranged to intersect the first grooves 293, spaced apart from the first grooves 293. The first grooves 293 and the second grooves 294 are respectively formed to be drawn in from the fourth plane 292. When the diffusion plate 29 is formed of plastic, it is formed by pressing with a heating mold, It can be formed by injection into a mold. When forming by pressing with a heating mold, it is possible to form a diffusion plate 29 by pressing the mold formed with the pattern of the first grooves 23 and the second grooves 24.

The fourth plane 292 between the first grooves 293 and the fourth plane 292 between the second grooves 294 may form a curved surface. The portion of the fourth plane 292 between the first grooves 293 and the first grooves 293 and the fourth plane 292 between the second grooves 294 and the second grooves 294. Each portion of) may form a lenticular pattern.

The first grooves 293 and the second grooves 294 may be formed in the third plane 291. Although not illustrated in the drawings, the first grooves 293 and the second grooves 294 may be formed in both the third plane 291 and the fourth plane 292.

In addition, as shown in FIG. 9, the first grooves 293 may be formed in the third plane 291, and the second grooves 294 may be formed in the fourth plane 292, respectively. In this case, a portion of the third plane 291 between the first grooves 293 and the first grooves 293 and a fourth plane 292 between the second grooves 294 and the second grooves 294. Each portion of) may form a lenticular pattern.

FIG. 10 schematically illustrates a pattern formed by the first grooves 293 and the second grooves 294. In the embodiment according to FIG. 10, all of the first grooves 293 and the second grooves 294 are formed in a regular pattern. Therefore, the surface of the first surface 21 is formed by the first grooves 293 and the second grooves 294 to have a three-dimensional structure formed such that the bottom is rectangular and the center is curved.

By this structure, the light emitted from the light emitting part 22 is not only diffused in one specific direction but uniformly diffused in the planar direction. At this time, by making the distance d1 between the first grooves 293 and the distance d2 between the second grooves 294 equal to each other, an overall uniform diffusion effect can be enhanced.

Although not shown in the drawings, the difference in the diffusion effect may be locally formed by differently forming the distance d1 between the first grooves 293 and the distance d2 between the second grooves 294. As a result, the luminance of the light can be increased even in the direction away from the light emitting portion 22.

11 is a plan view illustrating a pattern of first grooves 293 'and second grooves 294' according to another exemplary embodiment of the present invention.

As shown in FIG. 11, the first grooves 293 'and the second grooves 294' may be formed to have a curve. Due to the pattern shape of the curve, the shape of light emitted from the light emitter 22 may be more diversified, and thus the lighting effect may be further increased.

In FIG. 11, both the first grooves 293 ′ and the second grooves 294 ′ are formed in a curved pattern, but the present invention is not limited thereto, and at least one of them may have a curved pattern. Curved patterns can also be formed locally only.

In the embodiment shown in FIG. 10, the first grooves and the second grooves cross each other so as to be perpendicular to each other.

However, the present invention is not necessarily limited thereto, and as shown in FIG. 12, the first grooves 293 ″ and the second grooves 294 ″ may cross each other at an inclination angle θ.

It is preferable to make this inclination angle (theta) become acute angle.

According to the pattern structure, the light emitted from the light emitter 22 may have a different diffusivity and luminance distribution from the embodiment of FIG. 10, and thus the lighting effect may also vary.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (10)

A panel provided on a flat plate and having a second plane provided on a side opposite to the first plane and the first plane;
A light emitting part formed on a first plane of the panel and including a plurality of LED elements and having a light emitting surface parallel to the first plane, wherein the light emitting surface is inclined at an acute angle with respect to the ground;
A chassis plate coupled to a second plane of the panel and provided with a material capable of transferring heat generated from the panel;
A plurality of heat dissipation fins provided on a side opposite to said panel of said chassis plate; And
Reflecting plate extending from the panel; The reflecting plate,
A first portion inclinedly extended to have a second angle less than the first angle with respect to the ground;
A second portion extending from the panel and extending away from the ground inclined with respect to the ground; And
And a third portion connecting the first portion and the second portion.
And a case having a space portion coupled to the chassis plate and accommodating the heat dissipation fins, wherein the case includes a plurality of vent holes penetrated through the space portion. The LED lighting apparatus of claim 1, wherein the shortest distance between the light emitting surface and the ground is shorter than the shortest distance between the first portion and the ground. The LED lighting apparatus of claim 1, wherein the first angle is less than half of a viewing angle of the LED device. The LED lighting device of claim 1, wherein the third portion includes a portion parallel to the ground. delete delete The LED lighting apparatus of claim 1, wherein the vent includes a plurality of first vents formed through the ground and a plurality of second vents formed at a position higher than the first vents. . The LED lighting apparatus of claim 7, wherein the sum of the areas of the first through holes is greater than the sum of the areas of the second through holes. The LED illuminating device according to any one of claims 1 to 4, 7 and 8, further comprising a diffuser plate disposed to face the light emitting portion and the reflecting plate. The diffusion plate of claim 9, wherein the diffusion plate has a third plane facing the light emitting part and the reflecting plate, and a fourth plane opposite to the third plane and spaced apart from each other on the third plane or the fourth plane. A plurality of first grooves and a plurality of second grooves provided to be spaced apart from each other on the third or fourth plane and intersecting the first grooves, wherein the first grooves and the second grooves LED lighting device characterized in that provided to be spaced apart.

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