KR102263298B1 - LED module improved radiant heat - Google Patents

Abstract

The present invention relates to a natural heat dissipation type LED module with an improved heat dissipation structure, and more particularly, when mounting and assembling the heat sink of the LED module in the luminaire enclosure, exposing the heat sink to the outside of the enclosure to achieve a heat dissipation effect using natural convection It relates to a natural heat dissipation type LED module having a function of preventing light pollution by limiting the irradiation range of light by a radiator exposed to the outside of the enclosure at the same time as it is raised
The natural heat dissipation type LED module with improved heat dissipation structure of the present invention includes a heat sink, a substrate coupled to a lower portion of the heat sink and on which an LED chip is mounted, and coupled to the lower portion of the substrate to surround the LED chip and to the outside of the enclosure of the luminaire. It has an exposed lens unit, the heat sink is formed to protrude from a plurality of heat dissipation fins on an upper surface, a base portion to which a substrate is coupled to a lower surface, and a base portion to protrude downward from both edges of the base portion to be exposed to the outside of the enclosure, It has an exposed heat dissipation rib for exchanging heat generated from the LED chip with the external air of the enclosure.

Description

Natural heat dissipation LED module with improved heat dissipation structure {LED module improved radiant heat}

The present invention relates to a natural heat dissipation type LED module with an improved heat dissipation structure, and more particularly, when mounting and assembling the heat sink of the LED module in the luminaire enclosure, exposing the heat sink to the outside of the enclosure to achieve a heat dissipation effect using natural convection It relates to a natural heat dissipation type LED module having a function of preventing light pollution by limiting the range of light irradiation by a heat sink exposed to the outside of the enclosure at the same time as it is raised.

In outdoor lighting fixtures such as street lights, security lights, and tunnel lights, light emitting diodes (LEDs) are mainly used as light sources.

When one of a mercury lamp, an incandescent lamp, and a halogen lamp is installed as a light source of an outdoor luminaire, power consumption is relatively high. In consideration of this, recently, light emitting diodes (LEDs) having advantages of high brightness, reduced power consumption, and long lifespan have been mainly used as light sources for street lamps.

Because outdoor luminaires are exposed to the outdoors, requirements for airtightness, water resistance, dust resistance and heat dissipating are more stringent than those for indoor lighting devices.

Since LEDs have low heat resistance, an LED module is used in outdoor lighting fixtures by integrating a board on which an LED chip is mounted and a heat sink in order to dissipate the heat generated by the LED.

Recently, power LEDs with better luminance than high luminance LEDs at the same power consumption have been developed, increasing the possibility of replacing them with high luminance LEDs. Power LEDs with a power consumption of 2W have problems in that when the temperature exceeds about 47°C during operation, the light output decreases, the wavelength changes and the color changes, and if the heat dissipation treatment is insufficient, the LED burns out within an hour. . That is, when the temperature of the power LED is increased due to insufficient heat dissipation treatment, the electrical resistance value decreases and the amount of current flowing through the power LED increases, thereby increasing power consumption.

As such, heat dissipation of the LED module is a very important issue in outdoor luminaires. 'LM80' is the LED lighting reliability evaluation standard of the Energy Star program hosted by the US Environmental Protection Agency (EPA). LM80 is given only to products that maintain the amount of light without lowering than above. The LM80 report is an indicator of the importance of heat dissipation because the lifespan according to the external temperature is described.

According to the general LED Package LM80 report, when the same current is applied while maintaining the temperature of the luminaire case at 55℃, 85℃, and 105℃, the lifespan of the LED chip according to the temperature is shown in Table 1 below.

No case temperature applied current Reported TM-21
L90 Lifetime 12 hours per day year % Data Set 4 55℃ 400mA 71000hr 5917 16.21 100 Data set 5 85℃ 400mA 57000hr 4750 13.01 80 Data Set 6 105℃ 400mA 44000hr 3667 10.05 62

Referring to the results of Table 1, it was found that 71000 hours, 57000 hours, and 44000 hours of use were possible when the case temperature was maintained at 55°C, 85°C, and 105°C, respectively. It can be seen that the lifespan of the LED chip varies depending on the temperature. It can be seen that the lifetime of the LED chip is reduced by 38% compared to 55°C at 105°C. This is an indicator that confirms the importance of heat dissipation in LED chips.

Typically, an LED module mounted on a luminaire includes a substrate on which an LED chip is mounted, a heat sink coupled to the upper portion of the substrate to emit heat, and a lens coupled to the lower portion of the substrate. Such a conventional LED module is disclosed in Korean Patent Registration No. 10-1492040.

The LED module is installed by being drawn into the interior of the enclosure of the luminaire. In this case, the lens of the LED module is exposed to the outside of the enclosure so that the light generated from the LED chip can be irradiated downward.

In addition, the LED lighting device disclosed in Korean Patent Registration No. 10-1787364 has a vent hole formed in the base frame and a sine wave type heat sink having a sinusoidal curve of an LED module equipped with a pest net of an air circulation structure for heat dissipation to engage with each other. According to the overlapping arrangement, the heat dissipation area per unit area is expanded to 20-30% compared to the conventional one, and heat exchange is quickly performed through the heat dissipation flow path formed of a sinusoidal curve line and a straight line between each heat sink. However, considering the purpose of providing a natural heat-dissipating LED lighting fixture that secures an air circulation path between each heat sink so that heat is quickly dissipated by natural convection through the ventilation hole of the enclosure, ventilation holes are needed to prevent insects from entering the ventilation holes. There is a problem that a pest net must be provided for.

In such a conventional LED module type light fixture, an efficient method for dissipating heat from the inside of the enclosure is required since the LED module is mounted and assembled inside the enclosure. Therefore, due to the increase in the internal temperature of the enclosure, a ventilation hole is formed in the enclosure to dissipate heat to the outside, but due to the limited space inside the enclosure, the heat dissipation of the LED module is significantly reduced due to the increase in the internal temperature. In addition, if a large area vent is formed in the enclosure to lower the internal temperature of the enclosure, a lot of spiders, wasps, and flying insects will flow in through the ventilation holes, causing dead bodies of insects, etc. to accumulate, which will have a fatal impact on the reliability of the enclosure. In case of rain, it may cause reliability and malfunction due to inflow of rainwater.

1. Republic of Korea Patent Registration No. 10-1492040: Replacement LED module for LED luminaires 2. Registered Patent No. 10-1787364: Natural heat dissipation LED lighting fixture

As described above, the present invention improves the problem that the heat dissipation property of the LED module is remarkably deteriorated due to the increase in the internal temperature due to the heat dissipation of the internal restricted area of the luminaire, and minimizes external elements flowing through the ventilation hole of the enclosure of the luminaire to improve reliability. This was created to improve the heat dissipation by exposing a part of the heat sink of the LED module to the enclosure of the luminaire, thereby accelerating heat dissipation by natural convection of the exposed heat sink by implementing a structure that can directly radiate the heat of the LED module to the outside. It aims to provide a natural heat dissipation type LED module with improved structure.

In addition, the present invention can prevent light pollution because a part of the radiator exposed to the luminaire enclosure can control and limit the irradiation range of light, and by reflecting the light exposed outside the irradiation range, convert it into the irradiation range and aggregate it Another object of the present invention is to provide a natural heat dissipation type LED module with an improved heat dissipation structure that can save energy by utilizing light lost by giving it.

A natural heat dissipation type LED module with improved heat dissipation structure of the present invention for achieving the above object includes a heat sink; a substrate coupled to a lower portion of the heat sink and on which an LED chip is mounted; a lens unit coupled to a lower portion of the substrate to surround the LED chip and exposed to the outside of an enclosure of a light fixture, wherein the heat sink is formed by protruding a plurality of heat dissipation fins on an upper surface of the heat sink, and a base portion to which the substrate is coupled to a lower surface and exposed heat-dissipating ribs that are formed to protrude downward from both edges of the base part, are exposed to the outside of the enclosure, and exchange heat generated from the LED chip with external air of the enclosure.

The exposed heat dissipation rib is formed at one edge of the base portion to limit the angle of the back light of the light emitted from the LED chip, and the exposed heat dissipation rib is formed at the other edge of the base portion to transfer the light emitted from the LED chip. and at least one of the front exposed heat dissipation ribs limiting the angle.

An inner surface of the exposed heat dissipation rib is inclined.

A reflective layer is formed on the inner surface of the exposed heat dissipation rib.

As described above, the present invention forms an exposed heat dissipation rib that can expose the heat dissipation body of the LED module to the outside when mounting and assembling the enclosure of the LED module type luminaire, so that the heat dissipation of the LED module using natural convection and the inside of the LED module type light fixture are quick. It has the effect of dissipating heat.

Therefore, the present invention forms an exposed heat dissipation rib that can be exposed to the outside of the LED module and exposes it to the outside of the luminaire enclosure. can be greatly improved.

In addition, the present invention has an effect of condensing and condensing lost light and a light pollution prevention function capable of limiting and controlling the range of light irradiation by the radiator exposed to the outside of the enclosure of the luminaire.

As described above, the present invention can accelerate the direct heat dissipation to the outside of the enclosure by realizing a heat dissipation structure by natural convection by forming the exposed heat dissipation ribs of the LED module, and minimize or eliminate ventilation holes in the LED module type luminaire. It is possible to eliminate the cause of acceleration/failure of

In addition, by adjusting the length/angle of the exposed heat dissipation rib of the LED module, it functions as a shade that can limit unnecessary light outside the irradiation range, thereby preventing light pollution that can significantly reduce the brightness of the surroundings outside the irradiation range. There is no need to form a separate light shield in the luminaire.

In addition, the exposed heat dissipation rib of the LED module converts the light of light loss, which limits the light that causes light pollution to unnecessary areas, into the irradiation category by converting the exposed heat dissipation rib into a reflector and condensing it to save energy by utilizing the lost light. can

1 is a side view showing a state in which a luminaire equipped with an LED module according to an example of the present invention is used as a street lamp;
Figure 2 is a bottom view showing the lower surface of the luminaire of Figure 1,
Figure 3 is an excerpted perspective view showing a state in which the LED module is mounted on the luminaire of Figure 1,
4 is a perspective view of an LED module applied to the luminaire of FIG. 1;
Figure 5 is an exploded perspective view of Figure 4,
Figure 6 is a side view of Figure 4,
Figure 7 is a schematic diagram for showing the operation of the LED module of Figure 4,
8 is a side view of an LED module according to another example of the present invention;
Figure 9 is a schematic diagram for showing the operation of the LED module of Figure 8,
10 is a side view of an LED module according to another example of the present invention;
11 is a side view of an LED module according to another example of the present invention;
12 is a schematic diagram of a luminaire according to the prior art,
13 is an experimental result showing the visual expression of a luminaire lighting equipped with four LED modules;
14 is a diagram for explaining the indication of the degree of irradiation of light in the designated area;
15 is an enlarged view of the central portion of the light irradiation diagram of the designated area in FIG. 14 .

Hereinafter, a natural heat dissipation type LED module with improved heat dissipation structure according to a preferred embodiment of the present invention will be described in detail.

The luminaire to which the present invention is applied can be applied to outdoor luminaires such as street lights, security lights, and tunnels. Hereinafter, an example applied as a lamp for a street lamp will be described.

1 to 6 , the outdoor light fixture 1 includes an enclosure 10 having a mounting hole 15 formed on its lower surface, and accommodated inside the enclosure 10 and the lower portion is external through the mounting hole 15 . At least one LED module 20 is provided to be exposed to.

The enclosure 10 is coupled to the arm 7 of the post 5 installed at a constant height from the ground.

The enclosure 10 has a structure with an empty interior so that the LED module 20 can be accommodated therein. The arm is connected to the rear of the enclosure (10).

A mounting hole 15 is formed on the lower surface of the enclosure 10 . The lower portion of the LED module 20 accommodated in the enclosure 10 is exposed to the outside through the mounting hole 15 .

One or more LED modules 20 of the present invention are accommodated inside the enclosure (10). In the illustrated example, four LED modules 20 are accommodated in the enclosure 10 .

The illustrated LED module 20 includes a heat sink 30 , a board 45 coupled to a lower portion of the heat sink 30 and on which an LED chip 47 is mounted, and a LED chip coupled to a lower portion of the board 45 . It includes a lens portion 49 that surrounds the enclosure (47) and is exposed to the outside of the enclosure (10).

The heat sink 30 is formed of a metal material having excellent heat transfer.

The heat sink 30 is formed by protruding a plurality of heat dissipation fins 32 from the upper surface, and from the base part 31 to which the fixing bracket 40 is coupled to the lower surface, and from both edges of the base part 31 in the upper direction. The heat dissipation ribs 33 and 34 that are formed to protrude and are drawn into the inside of the enclosure 10 are formed to protrude downward from both edges of the base part 31, respectively, and are exposed to the outside of the enclosure 10. Exposed heat dissipation ribs 35 and 37 for limiting the irradiation range of light generated from the LED chip 47 while exchanging heat generated from the LED chip 47 with the external air of the enclosure 10 are provided.

The base part 31 is formed in a rectangular plate shape. A plurality of heat dissipation fins 32 are formed to protrude from the upper surface of the base part 31 . Each heat dissipation fin 32 is formed to be elongated in the longitudinal direction of the base part 31 . A plurality of heat dissipation fins 32 are spaced apart from each other in the front-rear direction and arranged in parallel. The heat dissipation fins 32 may be formed so that at least one protrusion length is different from the rest. In addition, the heat dissipation fins 32 may all have the same or different protrusion lengths.

The incoming heat dissipation ribs 33 and 34 are formed to protrude upwardly from both edges of the base part 31 . The incoming heat dissipation ribs 33 and 34 are introduced into the enclosure 10 . These incoming heat dissipation ribs 33 and 34 serve to radiate some of the heat generated from the LED chip 47 to the inside of the enclosure 10 .

The incoming heat dissipation ribs 33 and 34 may be divided into a rear incoming heat dissipating rib 33 and a front incoming heat dissipating rib 34 . For example, the incoming heat dissipation rib may be divided into a rear incoming heat dissipation rib 33 formed at the rear edge of the base part 31 and a front incoming heat dissipating rib 34 formed at the front edge of the base part 31 .

The rear and front incoming heat dissipation ribs 33 and 34 may be formed in different sizes and shapes or may have the same size and shape. In the illustrated example, the rear and front incoming heat dissipation ribs 33 and 34 have different sizes and shapes.

Unlike the figure, the lead-in heat dissipation ribs 33 and 34 may be omitted and only the heat dissipation fins 32 may be formed on the upper portion of the base portion 31 .

The exposed heat dissipation ribs 35 and 37 are formed to protrude downward from both edges of the base part 31 .

The exposed heat dissipation ribs 35 and 37 are exposed to the outside of the enclosure 10 . The exposed heat dissipation ribs 35 and 37 heat most of the heat generated from the LED chip 47 with the air outside the enclosure 10 , thereby discharging the heat to the outside of the enclosure 10 .

The exposed heat dissipation ribs 35 and 37 may include a rear exposed heat dissipation rib 35 and a front exposed heat dissipation rib 37 . For example, the exposed heat dissipation ribs 35 and 37 include the rear exposed heat dissipation ribs 35 formed on the rear edge of the base unit 31 and the front exposed heat dissipation ribs 37 formed on the front edge of the base unit 31 . can be divided into

In addition, the exposed heat dissipation ribs 35 and 37 may include only one of the rear exposed heat dissipation rib 35 and the front exposed heat dissipation rib 37 .

The outer surface of the rear exposed heat dissipation rib 35 and the outer surface of the front exposed heat dissipation rib 37 have a curved shape as a plurality of heat dissipation fins are formed to increase heat dissipation efficiency.

The substrate 45 is positioned under the heat sink 30 . The substrate 45 may be directly coupled to the heat sink 30 or may be coupled to the substrate in the form of being mounted on the fixing bracket 40 . In the illustrated example, the substrate 45 is coupled to the lower portion of the fixing bracket 40 mounted to the base part 31 . In contrast, the fixing bracket 40 is omitted and the substrate 45 may be directly coupled to the lower surface of the base part 31 of the heat sink 30 . In this case, the portion to be fixed to the enclosure 10 may be provided on the radiator 30 .

The fixing bracket 40 is installed on the lower surface of the base part 31 . The fixing bracket 40 is made of a plate shape of a certain thickness. The fixing bracket 40 is formed of a metal material having excellent heat transfer efficiency.

The fixing bracket 40 serves to fix the LED module 20 to the enclosure 10 . A plurality of screw insertion holes 41 are formed in the fixing bracket 40 to be coupled to the base part 31 by screws. And fixing holes 42 are formed on the left and right sides of the fixing bracket 40 to be fixed to the bottom surface of the enclosure 10 by screws.

A plurality of LED chips 47 are arrayed in two rows and mounted on the substrate 45 .

The lens unit 49 is coupled to the lower portion of the substrate 45 . The lens unit 49 may be coupled to the substrate 40 by screws. The lens unit 49 is provided with a plurality of convex diffusion lenses. Each diffusion lens is positioned to correspond to the LED chip, and the diffusion lens surrounds the LED chip.

Since the LED module 20 having the above-described structure is in direct contact with external air by exposing a portion of the heat sink 30 to the outside of the luminaire enclosure 10, the heat dissipation effect can be greatly improved.

In addition, in the present invention, the rear and front exposed heat dissipation ribs 35 and 37 of the LED module 20 are exposed to the outside of the enclosure 10 to have a heat dissipation function and at the same time, the light generated from the LED chip 47 is irradiated. It has a function to prevent light pollution by limiting the range.

Conventional street lamp luminaires generate light pollution by irradiating light not only to areas requiring illumination, such as sidewalks and roadways, but also to areas that do not require illumination around them. Therefore, since all the illumination outside the area requiring illumination is unnecessary illumination, a corresponding amount of light loss occurs, and it is necessary to control the irradiation angles of the transfer light and the rear light. Since street lamps have the characteristic of being installed on the shoulder of an area requiring illumination, especially in the case of backlight, only some light distribution curves are included in the area requiring illumination, and most of the light distribution curves are included in the area where illumination is unnecessary. This causes greater light loss.

For this purpose, conventionally, a light shielding film is installed in the luminaire enclosure or the shape of the lens unit is modified to limit the irradiation angle of the rear light or the transfer light.

The state of a conventional luminaire in which the light shield 100 is installed is shown in FIG. 12 . 12 shows that a light shield 100 is installed in a luminaire on which a plurality of LED modules 110 are mounted to control the backlight. Since the backlight is unnecessary light in road lighting, it can be uniformly blocked by one light shield 100 as shown in FIG. 12 , but in this case, the LED module 110 located close to the light shield 100 loses light. There is a big problem with this. When 4 LED modules are applied, the length of the halo must be at least 218mm and the width is also expected to be at least 350mm because the left and right sides of the halo must be blocked by the left and right angles of the halo irradiated to the rear when controlling the rear light at 53 degrees. And when controlling the rear light at 45 degrees, the length of the light shield is 283mm, and the width has to be wider as well. This is when there are 4 types of LED modules, so if the number of LED modules increases, it may be difficult to control the backlight realistically. In order to control the backlight in the luminaire, the length of the light shield must be increased as much as the number of LED modules applied according to the angle of the backlight to be controlled according to the height of the luminaire on the pole and the number of modules, so it is very large when more than 6 LED modules are applied. A light shield of the size is inevitably required. As a result, the aesthetics is impaired, and the light screen that is screwed to the outside of the enclosure is more likely to break out due to bad weather, old age, corrosion, etc., affecting the manufacturing cost, and there is a risk of a safety accident due to the separation.

In addition, the conventional technique of limiting the irradiation angle of the rear light or the transfer light by changing the shape of the lens unit is also difficult to control the light. Due to the nature of the lens, the lens has to be made of transparent material, so a lot of light spreads out in all directions, so it is impossible to control the backlight and transfer light.

On the other hand, in the present invention shown in FIGS. 1 to 6 , effective control of the backlight and transfer light is possible only with the heat sink 30 itself, so that an appropriate light distribution curve is formed, thereby preventing light pollution caused by irradiation of unnecessary areas.

In the present invention, the rear exposed heat dissipation rib 35 of the heat sink 30 is positioned at the rear of the lens unit 49 to limit the angle of the rear light of the light generated from the LED chip 47, and The front exposure heat dissipation rib 37 is positioned in front of the lens unit 49 and serves to limit the angle of the transfer light of the light generated from the LED chip 47 .

It is preferable that the protruding lengths of the front and rear exposed heat dissipation ribs 35 and 37 be at least longer than the protruding length of the lens portion 49 so as to perform the light pollution prevention function.

The front and rear exposed heat dissipation ribs 35 and 37 may have different sizes and shapes, or may have the same size and shape. In the illustrated example, the front and rear exposed heat dissipation ribs 35 and 37 are formed to have different protruding lengths.

The angle of the rear light (light diffused in the rear direction) and the angle of the transfer light (light diffused in the front direction) are adjusted by the protruding lengths of the front and rear exposed heat dissipation ribs 35 and 37 . Therefore, the protrusion length of the front and rear exposed heat dissipation ribs 35 and 37 can be appropriately formed by the irradiation angle to be limited.

For example, as shown in FIG. 6, when using between the two rows of LED chips 47 as a reference point, when irradiating the rear light up to 53° in the direction perpendicular to the reference point, the length of the rear exposed heat dissipation rib 35 is 20 mm, The length of the front exposed heat dissipation rib 37 is 10 mm when irradiating the transfer light up to 70° with respect to the direction perpendicular to the reference point.

And as shown in FIG. 8, when the rear light is irradiated up to 45° in the direction perpendicular to the reference point, the length of the rear exposed heat dissipation rib 35 is 26 mm, and the transfer light is 60° in the direction perpendicular to the reference point. The length of the front exposed heat dissipation rib 37 is 18mm when irradiating up to

As described above, according to the present invention, it is possible to effectively prevent light pollution due to irradiation of unnecessary areas by forming an appropriate light distribution curve because it is possible to control the backlight and transfer light only by the heat sink 30 itself.

In addition, in the present invention, since the rear exposed heat dissipation rib 35 and the front exposed heat dissipation rib 37 are formed for each LED module 20, the diffusion of light generated from each LED module 20 is individually controlled. This can reduce the loss of light.

7 or 9, when a plurality of LED modules 20 are closely assembled, each LED module is affected by the exposed heat dissipation ribs 35 and 37 of the adjacent LED module 20, so that the control angle of the light is different. can

In the present invention, the heat dissipation of the LED module is exposed to the outside at the distance closest to the light source, and the present invention is used as a light shield to control the light, so that the efficiency of heat dissipation and the prevention of light pollution are possible.

Meanwhile, the inner surface of the rear exposed heat dissipation rib 35 and the inner surface of the front exposed heat dissipation rib 37 may be inclined. This inclined inner surface serves to reflect the light diffused beyond the limit angle within the limit angle.

Preferably, a reflective layer may be formed on the inner surface of the rear exposed heat dissipation rib 35 and the inner surface of the front exposed heat dissipation rib 37 . The reflective layer may be formed by high-gloss chrome plating to enhance the reflective effect. Of course, a reflector may be used as the reflective layer.

On the other hand, the length of the rear and exposed heat dissipation ribs 35 and 37 of the heat dissipation body 30 of the LED module 20 are the same as shown in FIG. 10, or the length of the rear exposed heat dissipation rib 35 as shown in FIG. It can be formed longer than the length of the front exposed heat dissipation rib (37).

13 shows a light distribution of a luminaire equipped with four LED modules. A case in which a conventional LED module is mounted, a case in which the LED module of the present invention is mounted, and a case in which a conventional LED module is mounted and a light shield is installed are compared.

As in the visual expression of the night reference lighting shown in FIG. 13 , when the LED module of the present invention is mounted, it can be confirmed that the light is divided by an accurate line. When a light shield is formed on a general LED module, it can be seen that the light is not completely blocked even though the light shield is formed with a height of 300 mm and a width of 350 mm.

FIG. 14 is a diagram for explaining the display of the light irradiation degree of the designated area in the experiment of FIG. 13 .

Referring to the light irradiation diagram of the designated area of FIG. 15 , it can be seen that the color ellipse spreads out from the center into an ellipse. An elliptical region of this color indicates strong light with the central point as a boundary, and an elliptical region of the same color indicates an area having the same light intensity. This is an indicator to know the intensity of the light irradiated on the road and the irradiation area.

When comparing the area of 30 m in road length with the 3 lane road lighting as a boundary, it was found that the area of the light with the strongest intensity was the widest when the LED module of the present invention was installed. It can be seen that in the case of the LED module of the present invention, the back light and transfer light are blocked by the exposed heat dissipation rib of the heat sink, and the light is concentrated on the road, which is an area requiring illumination.

As mentioned above, the present invention has been described with reference to an embodiment shown in the drawings, but this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. will be. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

10: enclosure 20: LED module
30: heat sink 35: rear exposed heat dissipation rib
37: front exposed heat dissipation rib 40: fixing bracket
45: substrate 47: LED chip
49: lens unit

Claims (4)

An outdoor type having a lens unit 49 that is installed to be accommodated inside the enclosure 10 of the outdoor type luminaire 1 and whose lower part is exposed to the outside through a mounting hole 15 formed on the lower surface of the enclosure 10 . In the natural heat dissipation type LED module 20 for a luminaire,
a heat sink 30;
a fixing bracket 40 coupled to the lower surface of the enclosure 10 to fix the heat sink 30 to the enclosure;
and a substrate 45 coupled to the lower portion of the fixing bracket 40 and on which the LED chip 47 is mounted;
The lens unit 49 is coupled to the lower portion of the substrate 45 and surrounds the LED chip 47 and is exposed to the outside of the enclosure 10 ,
The heat sink 30 includes a base portion 31 to which the fixing bracket 40 is coupled to a lower surface, and heat dissipation ribs 33 and 34 formed to protrude upward from the base portion 31, and the and exposed heat dissipation ribs 35 and 37 formed to protrude downward from the base 31 and exposed to the outside of the enclosure 10,
The exposed heat dissipation ribs 35 and 37 exchange heat generated from the LED chip 47 with the external air of the enclosure 10 to discharge heat to the outside of the enclosure 10,
The exposure heat dissipation ribs 35 and 37 are located at the rear of the lens unit 49 and include a rear exposed heat dissipation rib 35 for limiting the angle of the rear light of the light generated from the LED chip 47, and the lens unit Outdoor type with improved heat dissipation structure, characterized in that it is located in front of (49) and has at least one of the front exposed heat dissipation ribs (37) for limiting the angle of the transfer light of the light generated from the LED chip (47). Natural heat dissipation LED module for luminaires. delete delete [2] The natural heat dissipation type LED module for outdoor luminaires with improved heat dissipation structure according to claim 1, wherein a reflective layer is formed on the inner surface of the exposed heat dissipation ribs (35, 37).

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