KR101476214B1 - Lighting apparatus - Google Patents

Abstract

The present invention relates to a lighting apparatus. According to one aspect of the present invention, provided is the lighting apparatus which includes a substrate, a light emitting unit which includes a plurality of LED arrays which are mounted on the substrate, a lens array which is mounted on the light emitting unit, and a power source unit which supplies power to the light emitting unit. Wherein, the lens array includes one or more first lens units with a plurality of first lenses with a first light distribution curve and one or more second lens units with a plurality of second lenses with a second light distribution curve which is different from the second light distribution curve.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus capable of realizing light distribution optimized for various outdoor lighting environments.

In general, an LED is a semiconductor device that emits light when a voltage is applied in a forward direction, has a long lifetime, low power consumption, has electrical, optical, and physical characteristics suitable for mass production, and is rapidly replacing incandescent bulbs and fluorescent lamps. In addition, LEDs are quickly applied to outdoor lighting such as street lamps, security lamps, parks, and security lamps.

Particularly, the luminaire is installed in the form of hanging on a pillar member, and it should be possible to investigate the angle of light according to the surrounding environment in an optimal state.

On the other hand, the LED has a small light distribution angle and a strong directivity. Therefore, in order to realize a constant angle of incidence (directional angle), the LED illumination device includes a lens unit for adjusting the direction of light emitted from the LED.

In particular, when lighting is provided on the roadway and on the road, such as a streetlight, the lens units must be individually designed and manufactured to optimize for various road lighting environments.

On the other hand, when the streetlight is installed incorrectly, the light distribution angle with respect to the road surface or the installation surface is not maintained properly, so that there arises a problem that light is irradiated to an area where illumination is unnecessary or illuminance of an area where illumination is required is reduced.

An object of the present invention is to provide a lighting device capable of realizing light distribution optimized for various outdoor lighting environments.

Another object of the present invention is to provide a lighting device capable of realizing individual light distribution for each specific area of a road or a certain area of a road.

Another object of the present invention is to provide a lighting apparatus which can realize various light distribution through combination of lenses having different light distribution curves.

It is another object of the present invention to provide a lighting apparatus which can realize various additional light distribution besides the light distribution of an individual lens through a combination of lenses having individual light distribution.

According to an aspect of the present invention, there is provided a light emitting device comprising: a light emitting unit including a substrate and a plurality of LED arrays mounted on the substrate; A lens array mounted on the light emitting unit; And a power unit for supplying power to the light emitting unit.

Wherein the lens array includes at least one first lens unit provided with a plurality of first lenses having a first light distribution curve and at least one second lens unit provided with a plurality of second lenses having a second light distribution curve different from the first light distribution curve, .

At this time, the first lens unit and the second lens unit are provided so as to surround different LED arrays, respectively.

According to still another aspect of the present invention, there is provided a heat sink comprising: a heat sink; A first light emitting unit including a first substrate mounted on the heat sink and a plurality of LED arrays mounted on the first substrate; A first lens array mounted on the first light emitting unit; A second light emitting unit including a second substrate mounted on the heat sink and a plurality of LED arrays mounted on the second substrate; A second lens array mounted on the second light emitting unit; And a power unit for supplying power to the first and second light emitting units.

The first lens array and the second lens array may include a first lens unit having a plurality of first lenses having a first light distribution curve and a second lens unit having a second light distribution curve different from the first light distribution curve, And a lens unit.

At this time, the light distribution characteristics of the first and second lens arrays are set such that the number of the first and second lens units, the arrangement order of the first and second lens units, and the arrangement order of the first and second lens units, Based on at least one of the angles rotated by the reference.

According to still another aspect of the present invention, there is provided a light emitting device comprising: a light emitting unit including a substrate and a plurality of LED arrays mounted on the substrate; A lens array mounted on the light emitting unit; And a power unit for supplying power to the light emitting unit.

Here, the lens array includes a plurality of lenses having the same light distribution curve, and includes a plurality of lens units for individually surrounding each LED array.

At least two or more lens units are mounted at different angles with respect to the center of the corresponding LED array.

As described above, the lighting apparatus according to one embodiment of the present invention has the following effects.

First, the illumination device related to the present invention can realize light distribution optimized for various outdoor illumination environments.

Particularly, it is possible to implement individual light distribution by road or specific areas of the roadway in consideration of the specificity of road lighting.

In addition, various types of light distribution can be realized for each specific region through the combination of lenses having different light distribution curves.

In addition, it is possible to realize various additional types of light distribution in addition to the light distribution of each individual lens through the number of lenses having the individual light distribution, the order of arrangement, and rotation.

In addition, it is easy to assemble to adjust the light distribution characteristics, and the manufacturing cost can be reduced.

1 is a front view of a lighting apparatus according to an embodiment of the present invention.
2 is a configuration diagram of a lighting apparatus according to an embodiment of the present invention.
3 is a partially exploded perspective view of the illumination device shown in Fig.
4 is an exploded perspective view of the light emitting unit and the lens array.
5 (a) shows a perspective view of a first lens constituting a lighting device according to an embodiment of the present invention.
5 (b) shows the light distribution curve of the first lens shown in Fig. 5 (a).
6 (a) shows a perspective view of a second lens constituting a lighting device according to an embodiment of the present invention.
6 (b) shows the light distribution curve of the second lens shown in Fig. 6 (a).
7 is a plan view showing various embodiments of the lens array.
8 is a cross-sectional view of a heat sink constituting a lighting apparatus according to an embodiment of the present invention.

Hereinafter, a lighting apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

The illumination device related to the present invention can be applied to both indoor and indoor lighting devices such as a streetlight.

Fig. 1 is a front view of a lighting apparatus 1 according to an embodiment of the present invention, and Fig. 2 is a configuration diagram of a lighting apparatus 1 related to an embodiment of the present invention.

The illumination device 100 includes a light emitting unit 100, a lens array 130, and a power source unit 300.

The light emitting unit 100 may include an LED as a light source. Further, the lens array 130 is mounted on the light emitting unit 100. In addition, the lens array 130 can control the optical characteristics of light emitted to the outside so that the light emitted from the light emitting unit 100 has predetermined light distribution. Here, the light distribution or light distribution characteristics by the lens array 130 can be represented by a light distribution curve.

The power supply unit 300 is electrically connected to the light emitting unit 100. The power supply unit 300 supplies power to the light emitting unit 100.

The power supply unit 300 may include a controller for controlling brightness and / or color temperature of the light emitting unit 100. The power unit 300 may include a converter for converting an external commercial power source into a DC power source.

In addition, the lighting apparatus 1 includes a heat sink 200 on which the light emitting unit 100 is mounted. The light emitting unit 100 may be disposed on one side of the heat sink 200.

The heat sink 200 functions to dissipate heat generated from the light emitting unit 100 to the outside. The heat sink 200 may be formed of a metal material having excellent thermal conductivity. In addition, the heat sink 200 forms the appearance of the lighting device 1. [

Meanwhile, the lighting device 1 may include a rear housing 20 surrounding the power unit 300. The rear housing 20 may be mounted on the heat sink 200.

In addition, the lighting apparatus 1 may include a front housing 10 mounted on the heat sink 200. Here, the front housing 10, the heat sink 200, and the rear housing 20 may form the appearance of the lighting apparatus 1, respectively.

At this time, the front housing 10 is mounted on one end of the heat sink 200, and the rear housing 20 is mounted on the other end of the heat sink 200. Specifically, the heat sink 200 may be disposed in a space between the front housing 10 and the rear housing 20.

The front housing 10, the rear housing 20, and the heat sink 200 may be formed of the same material. In one embodiment, the heat sink 200 and the rear housing 20 may be formed of the same metal. Alternatively, the heat sink 200 may be formed of a metal material, and the rear housing 20 may be formed of a resin material.

A light emitting unit 100 is disposed in the heat sink 200 and a power unit 300 is disposed in the rear housing 20. At this time, the light emitting unit 100 and the power unit 300 may be electrically connected through a cable or the like.

At this time, a part of the cable may be located inside the rear housing 20, and the remaining area may be located inside the heat sink 200.

When the illuminating device 1 is an outdoor illuminating device, the illuminating device 1 may further include a supporting member 30.

The support member 30 may be connected to the rear housing 20. In one embodiment, the rear housing 20 may be provided with an insertion hole 21. At this time, a part of the support member 30 may be positioned inside the rear housing 20 through the insertion hole 21. [

Further, the support member 30 may have a "B" shape or a "B" shape. In one embodiment, the support member 30 may include a pole portion fixed to a mounting surface such as a road or a lead, and an arm portion inserted into the rear housing 20. [

FIG. 3 is a partially exploded perspective view of the illumination device shown in FIG. 1, and FIG. 4 is an exploded perspective view of the light emitting unit and the lens array.

The light emitting unit 100 includes a substrate 110 and a plurality of LED arrays 120 mounted on the substrate 110. 4, the plurality of LED arrays 120 includes a first LED array 120-1, a second LED array 120-2, and a second LED array 120-2, which are sequentially disposed along the longitudinal direction L of the substrate 110, 3 LED array 120-3 and a fourth LED array 120-4.

Each LED array 120 (120-1 to 120-4) may include a plurality of LEDs 121 arranged along the circumferential direction. In one embodiment, the LED array 120 may include a plurality of LEDs 121 each positioned in a lattice.

The distance between the plurality of LEDs 121 of the LED array 120 may be the same along the length direction L and the width direction W of the substrate 110. Further, the plurality of LEDs 121 may be arranged in N rows and N columns (N > 1), respectively.

Further, each of the LED arrays 120-1 to 120-4 can take charge of light distribution in different areas of the illumination space. For example, each of the LED arrays 120-1 to 120-4 may individually take on the light distribution of the divided illumination space.

In addition, the illumination device 1 may include a light transmitting member 40 surrounding the light emitting unit 100. The light transmitting member 40 may be formed of a glass.

A gasket 41 may be mounted on the periphery of the light transmitting member 40. The gasket 41 functions to improve watertightness and airtightness.

The illuminating device 1 may include a front bracket 50 surrounding the periphery of the light transmitting member 40. The front bracket 50 may be mounted to the heat sink 200. The front bracket 50 may be provided with an opening 51 for exposing the light transmitting member 40 to the outside.

5A is a perspective view of a first lens constituting an illumination device according to an embodiment of the present invention, and FIG. 5B is a perspective view of a light distribution curve of the first lens shown in FIG. .

6 (a) is a perspective view of a second lens constituting an illumination device according to an embodiment of the present invention, and Fig. 6 (b) is a perspective view of the second lens shown in Fig. 6 Light distribution curve.

The lens array 130 includes at least one first lens unit 140 having a plurality of first lenses 141 having a first light distribution curve and a plurality of second lenses 141 having a second light distribution curve different from the first light distribution curve, (Refer to FIG. 7) provided with at least one second lens unit 151 (see FIG. 7). Specifically, the lens array 130 may include a plurality of lens units 140 and 150 having different light distribution curves.

For example, the first lens unit 140 is mounted on the substrate 110 so as to surround the first LED array 120-1, and the second lens unit 150 is mounted on the second LED array 120- 2 to surround the substrate 110. Specifically, the first lens unit 140 and the second lens unit 150 are mounted on the substrate 110 so as to surround different LED arrays, respectively.

In this case, the light distribution curve (or the light distribution characteristic) of the light emitted from the first LED array 120-1 is different from the light distribution curve of the light emitted from the second LED array 120-2. When the lens array 130 includes a plurality of lens units 140 and 150 having different light distribution curves, the light distribution characteristics of the divided illumination spaces may be individually varied.

The light distribution characteristic (or the light distribution curve) of the lens array 130 is determined by the number of the first and second lens units 140 and 150, the arrangement order of the first and second lens units 140 and 150, The second lens unit 140, 150 may be varied based on at least one of the angles rotated about the center of the LED array 120. [

For example, the light distribution characteristic (or the light distribution curve) of the lens array 130 may be varied by adjusting the number of the first and second lens units 140 and 150.

The light distribution characteristic (or the light distribution curve) of the lens array 130 may be changed by adjusting the arrangement order of the first and second lens units 140 and 150. In this document, the order of arranging the first and second lens units 140 and 150 can be determined based on the longitudinal direction L of the substrate 110.

The light distribution characteristic (or the light distribution curve) of the lens array 130 is adjusted by adjusting the number of the first and second lens units 140 and 150 and the arrangement order of the first and second lens units 140 and 150 The first lens unit 140 and the second lens unit 150 must have the same size (size or specification).

Further, the first lens unit 140 or the second lens unit 150 must be selectively mountable to the same LED array 120. [ Specifically, the first lens unit 140 and the second lens unit 150 may be provided in a compatible (or replaceable) state with respect to the single LED array 120. [

As described above, each of the LED arrays 120-1 to 120-4 may include a plurality of LEDs 121 arranged along the circumferential direction.

At this time, the plurality of first lenses 141 of the first lens unit 140 may be provided along the circumferential direction so as to correspond to the positions of the LEDs 121 of the LED array 120. Similarly, the plurality of second lenses 151 of the second lens unit 150 may be provided along the circumferential direction so as to correspond to the positions of the LEDs 121 of the LED array 120, respectively.

The number of the first lenses 141 of the first lens unit 140 and the number of the second lenses 151 of the second lens unit 150 are set to be equal to the number of the LEDs 121 of the LED array 120 Can be the same.

For example, when the LED array is arranged in two rows and two columns of four LEDs, the plurality of first lenses 141 of the first lens unit 140 are provided in four and can be arranged in two rows and two columns. Similarly, the plurality of second lenses 151 of the second lens unit 150 are provided in four, and may be arranged in two rows and two columns.

The first lens unit 140 and the second lens unit 150 may have first and second fastening holes 142 and 152 at the center, respectively. At this time, the plurality of first lenses 141 may be provided along the circumferential direction around the first fastening hole 142, respectively. Similarly, a plurality of second lenses 151 (see FIG. 7) may be provided along the circumferential direction around the second fastening hole 152, respectively.

The distance between the first fastening hole 142 and the first lens 141 and the distance between the second fastening hole 152 and the second lens 151 may be the same. The angle between the adjacent two first lenses 141 and the angle between two adjacent second lenses 151 may be the same.

Through the above structure, the first lens unit 140 and the second lens unit 150 can be compatible (or replaceable) with respect to the single LED array 120.

The substrate 110 may be provided with a plurality of mounting holes 111 for mounting the first lens unit 140 or the second lens unit 150. A plurality of mounting holes 111 may be provided along the longitudinal direction L of the substrate 110.

The illuminating device 1 may further include a plurality of second fastening members for mounting the substrate 110 and the first lens unit 140 or for mounting the substrate 110 and the second lens unit 150, Member (e. G., A screw).

The second fastening member may be fastened to the mounting hole 111 of the substrate 110 through the first fastening hole 142 of the first lens unit 140. The second fastening member passes through the first fastening hole 142 of the first lens unit 140 and the mounting hole 111 of the substrate 110 in order to be fastened to the heat sink 200 It is possible.

The second fastening member may be fastened to the mounting hole 111 of the substrate 110 through the second fastening hole 152 of the second lens unit 150. The second fastening member passes through the second fastening hole 152 of the second lens unit 150 and the mounting hole 111 of the substrate 110 in order to be fastened to the heat sink 200 It is possible.

Meanwhile, the mounting hole 111 may be located at the center of the LED array. That is, a plurality of LEDs 121 constituting the LED array 120 may be arranged along the circumferential direction around the mounting hole 111.

As described above, the light distribution characteristic (or the light distribution curve) of the lens array 130 is set such that at least one of the angles of rotation of the first or second lens unit 140, 150 relative to the center of the LED array 120 . ≪ / RTI >

The first lens unit 140 may be mounted on the substrate 110 while being rotated around the first fastening hole 142 by a predetermined angle. For example, when the first lens unit 140 includes four first lenses 141 arranged in two rows and two columns, four light distribution characteristics (light distribution Curve).

The plurality of first lenses 141 of the first lens unit 140 are coupled to the LED array 140 through the first coupling holes 142. [ The LEDs 121 of the LEDs 120 may be rotated.

Similarly, as the second lens unit 150 is rotated around the second fastening hole 152 by a predetermined angle, a plurality of first lenses 151 of the second lens unit 150 are rotated by the LED array 120 And the LEDs 121 of the LEDs 121, respectively.

In summary, either the first lens unit 140 or the second lens unit 150 may be selectively replaceable or compatible with respect to the single LED array 120. In addition, the plurality of first lens units 140, which are respectively rotated at different angles with respect to the center of the LED array 120, may be selectively replaceable or compatible with the single LED array 120. Likewise, the plurality of second lens units 150, each rotated at different angles relative to the center of the LED array 120, may be selectively replaceable or compatible with the single LED array 120.

7 is a plan view showing various embodiments of the lens array.

5 and 7, the first lens unit 140 is configured such that a plurality of first lenses 141 are symmetrical with respect to the longitudinal direction of the substrate 110 about the first coupling hole 142, 100 in the width direction.

6 and 7, the second lens unit 150 is configured such that the plurality of second lenses 151 are symmetrical about the longitudinal direction of the substrate 110 about the second fastening hole 152 And may be provided not to be symmetrical along the width direction of the substrate 110.

Of course, the first lens 141 and the second lens 151 have different light distribution curves.

5, the first lens 141 may have a left / right symmetrical shape. Further, the first lens 141 may have an upward / downward symmetrical shape. At this time, the left / right direction of the first lens 141 can be used in coincidence with the traveling direction of the vehicle.

6, the second lens 151 may have a left / right symmetrical shape. Further, the second lens 151 may have an asymmetrical shape in an up / down direction. At this time, the left / right direction of the second lens 151 can be used in coincidence with the vehicle traveling direction of the roadway. Further, the second lens 151 can be used in a state in which the upper side thereof is directed to the side (opposite direction of the delivery).

1 and 7, the lighting apparatus 1 may include a heat sink 200 and a plurality of light emitting units mounted on the heat sink 200. [

Referring to FIG. 1, the first to fourth light emitting units may be disposed in order from the front housing 10 toward the rear housing 20. In addition, the illumination device 1 may include a plurality of lens arrays 130-1 to 130-4 surrounding each light emitting unit. Of course, the number of light emitting units and the number of lens arrays can be variously increased or decreased according to the illumination environment. The structure of each light emitting unit and the structure of the lens array are the same as those described with reference to Fig. Further, each light-emitting unit can take charge of light distribution in different divided areas of the illumination space.

In one embodiment, the first light emitting unit includes a first substrate 110-1 mounted on the heat sink 200 and a plurality of LED arrays mounted on the first substrate 110-1. Similarly, the second light emitting unit includes a second substrate 110-2 mounted on the heat sink 200 and a plurality of LED arrays mounted on the second substrate 110-2.

In this case, the illumination device 1 includes a first lens array 130-1 mounted on the first light emitting unit and a second lens array 103-2 mounted on the second light emitting unit.

The power supply unit 300 supplies power to the respective light emitting units. In one embodiment, the power supply unit 300 supplies power to the first and second light emitting units.

To this end, the illumination device 1 further includes a side substrate 160 provided with a first connector and a second connector 161 electrically connected to the first light emitting unit and the second light emitting unit, respectively . The first connector and the second connector 161 are merely for the sake of convenience of description, they have the same structure, they can be represented by the same reference numerals, and can be simply referred to as a connector. In addition, the number of the connectors 161 may be determined to be the same as the number of the light emitting units.

The side substrate 160 and the substrates 110-1 to 110-4 of the respective light emitting units may be mounted on the same surface of the heat sink 200. [ Specifically, the side substrate 160 and the light emitting unit substrates 110-1 to 110-4 may be mounted on the first surface 210 of the heat sink 200, respectively.

Each of the first and second lens arrays 130-1 and 103-2 includes a first lens unit 140 provided with a plurality of first lenses 141 having a first light distribution curve, And a second lens unit 150 provided with a second lens 151 having a second light distribution curve different from that of the second light distribution curve.

As described above, the light distribution characteristic of the first lens array 130-1 is determined by the number of the first and second lens units 140 and 150 and the arrangement order of the first and second lens units 140 and 150 And the angle at which the first or second lens unit 140, 150 is rotated about the center of the LED array.

Similarly, the light distribution characteristic of the second lens array 130-2 is determined by the number of the first and second lens units 140 and 150, the arrangement order of the first and second lens units 140 and 150, Or the angle at which the second lens unit 140, 150 is rotated about the center of the LED array.

The first lens array 130-1 includes the first lens unit 140 and the second lens array 130-2 includes one or more first lens units 140 and one or more second lens arrays 130-1, And may include a lens unit 150.

Specifically, one lens array may include only the first lens unit 140 (see Fig. 7 (c)) and only the second lens unit 150 (refer to Fig. 7 (a) ).

In addition, any one of the lens arrays may include at least one first lens unit 140 and at least one second lens unit 150 (see Fig. 7 (b)).

7 (a) and 7 (c), the lens array includes a plurality of lenses having the same light distribution curve, and a plurality of lens units for individually surrounding each LED array .

At least two or more lens units may be mounted at different angles with respect to the center of the corresponding LED array.

Referring to FIG. 7 (a), one lens array may include only a plurality of second lens units 150.

Referring to FIG. 7 (c), one lens array may include only a plurality of first lens units 140. At least two or more first lens units 140 and 140 'may be mounted at different angles with respect to the center of the corresponding LED array. In summary, even when the lens array is constructed using only the first lens unit 140, different light distribution characteristics can be realized in the divided illumination regions by varying the angle of rotation based on the center of the LED array.

Referring to FIG. 7 (d), one lens array may include only a plurality of second lens units 150. At least two or more second lens units 150-1 to 150-4 may be mounted at different angles with respect to the center of the corresponding LED array.

Four second lens units 150 may be mounted on the substrate 110 while being rotated by 90 degrees along the clockwise direction CW.

7 (b), the light distribution characteristics of the lens array are determined based on the number of the first and second lens units 140 and 150 and the arrangement order of the first and second lens units 140 and 150 . That is, different light distribution characteristics can be realized in the divided illumination regions.

8 is a cross-sectional view of a heat sink 200 constituting a lighting apparatus according to an embodiment of the present invention.

Referring to FIG. 8, the lighting apparatus 1 includes a heat sink 200. The light emitting unit 100 is disposed in the heat sink 200.

The heat sink 200 has a first surface 210 on which the light emitting unit 100 is disposed and a second surface 220 opposite to the first surface 210. The heat sink 200 has a space 240 formed between the first surface 210 and the second surface 220 to have a predetermined volume.

Here, the first surface 210 may be a first member, and the second surface 220 may be a second member. In addition, the first member and the second member may integrally form the heat sink 200.

The second surface 220 may be provided with a flow hole 230 for opening a part of the space 240. The flow holes 230 may be referred to as floating slits.

The heat sink 200 may have a symmetrical shape with respect to the center axis of the heat sink 200.

8, the x-axis represents the width direction W of the heat sink 200, and the z-axis represents the height direction of the heat sink 200. As shown in Fig. The central axis of the heat sink 200 is substantially parallel to the z-axis. Therefore, the heat sink 200 may have a symmetrical shape with respect to the height direction of the heat sink 200.

At this time, the center of the flow hole 230 and the central axis of the heat sink 200 may be positioned on the same axis, respectively. In other words, the heat sink 200 may have a symmetrical shape with respect to the flow hole 230.

The second surface 220 is provided with a plurality of curved surfaces 221 and 222 having different radii of curvature along the height direction of the heat sink 200. At this time, when the plurality of curved portions 221 and 222 have different radii of curvature, the flow rates of the external air flowing along the second surface 220 can be changed. As a result, the convective heat exchange characteristics of the outside air flowing along the second surface 220 can be changed.

The first curved surface 221 and the second curved surface 221 have curvatures different from each other along the direction from the first surface 210 toward the flow hole 230, 222 may be provided in order. That is, the second surface 220 may include a first curved surface portion 221 and a second curved surface portion 222.

Here, the curvature radius of the first curved surface portion 221 may be smaller than the curvature radius of the second curved surface portion 222.

The center of curvature of the first curved portion 221 and the curvature center of the second curved portion 222 may be located in different regions defined by the second surface 220.

In one embodiment, the first curved surface portion 221 may have a convex shape along the z-axis direction. In addition, the second curved surface portion 222 may have a concave shape along the z-axis direction. The inflection point P may be provided at a boundary between the first curved surface portion 221 and the second curved surface portion 222.

The arc length of the first curved surface portion 221 may be shorter than the arc length of the second curved surface portion 222.

A planar portion 223 may be provided between the second curved portion 222 and the flow hole 230. At this time, the plane portion 223 may be formed parallel to the first surface 210.

A vertical portion 225 may be formed between the first surface 210 and the first curved surface 221 so as to extend perpendicular to the first surface 210. The vertical portion 225 extends from the boundary between the first curved portion 221 and the first surface 210.

At this time, the vertical part 225 and the first surface 210 may form a mounting space for the light emitting unit 100. In particular, the vertical part 225 may form a space for mounting the transparent cover 40 and the front bracket 50 described above.

In addition, the free end of the vertical part 225 may be bent toward the first surface 210 side.

On the other hand, the first curved surface portion 221 extends from the first surface 210. Specifically, the first curved surface portion 221 extends directly from the first surface 210. In addition, the inflection point P may be located in a region overlapping the light emitting unit 100 along the height direction of the heat sink 200 '.

On both sides of the first surface 210, a floating slit communicating with the space 240 may be formed.

In addition, a plurality of radiating fins 250 having a predetermined height may be provided in the space 240. The plurality of heat-radiating fins 250 may be spaced apart from each other by a predetermined distance.

At this time, at least one radiating fin 251 of the plurality of radiating fins 250 and 251 may be provided with a mounting portion for engaging with the aforementioned rear housing 20. In one embodiment, the radiating fin 251 with the mounting portion can be bent at its free end. That is, the mounting portion can bend the free end to form a predetermined mounting space.

The lighting apparatus 1 may include at least one fastening member S (see FIG. 3) for fastening the front housing 10 and the heat sink 200 together. The fastening member S may be fastened to the mounting portion of the radiating fin 251 through the front housing 10. [

On the other hand, when the light emitting unit 100 operates, the air in the space 240 can flow to the outside through the flow hole 230. At this time, the outflow of the air in the space 240 through the flow hole 230 can be referred to as a primary flow (upward flow).

In addition, external air may flow toward the flow hole 230 along the second surface 220. At this time, the flow of the external air along the second surface 220 can be referred to as a secondary flow. Further, the secondary flow can be generated or accelerated by the primary flow.

Also, the flow rate of the external air may increase during the passage through the first curved surface portion 221, and the flow rate may decrease during the passage through the second curved surface portion 222. Particularly, a coanda effect appears in the process of passing through the first curved portion 221.

The Coanda effect indicates a phenomenon in which the fluid flows while flowing along the fluid if the fluid is bent at a higher level.

Specifically, when the light emitting unit 100 operates, the temperature of the first surface and the space 240 increases. At this time, the primary flow is caused by the temperature difference between the high temperature part and the low temperature part. Also, the secondary flow described above can be generated or accelerated by the primary flow.

Also, the primary flow may perform the same function as the driving source of the secondary flow. Thus, the heat generated in the light emitting unit 110 can be easily diverted to the outside by the primary flow and the secondary flow.

With such a structure, the outside air passes through a plurality of curved portions having different radii of curvature of the heat sink 200, and the flow rate of the outside air can be continuously changed.

Specifically, the heat sink 200 can continuously change the convective heat exchange characteristics of the outside air as the flow rate of the outside air increases or the flow velocity decreases in a specific section.

Also, the heat radiation characteristic of the heat sink 200 can be improved through the Coanda effect.

1: Lighting device 10: Front housing
20: rear housing 100: light emitting unit
110: substrate 120: LED array
130: lens array 140: first lens unit
150: second lens unit 160: side substrate
200: heat sink 300: power supply unit

Claims (13)

A light emitting unit including a substrate and a plurality of LED arrays mounted on the substrate;
A lens array mounted on the light emitting unit; And
And a power unit for supplying power to the light emitting unit,
Wherein the lens array includes at least one first lens unit provided with a plurality of first lenses having a first light distribution curve and at least one second lens unit provided with a plurality of second lenses having a second light distribution curve different from the first light distribution curve Including,
Wherein the first lens unit and the second lens unit surround different LED arrays, respectively,
Each LED array includes a plurality of LEDs arranged along the circumferential direction,
Wherein the first lens unit and the second lens unit are provided with first and second fastening holes respectively at a central portion thereof,
The plurality of first lenses are provided along the circumferential direction around the first fastening hole so as to correspond to the positions of the LEDs of the LED array,
And the plurality of second lenses are provided along the circumferential direction around the second fastening hole so as to correspond to positions of the LEDs of the LED array. The method according to claim 1,
Wherein the light distribution characteristics of the lens array include at least one of a number of the first and second lens units, an arrangement order of the first and second lens units, and an angle of rotation of the first or second lens unit with respect to the center of the LED array Of the illumination device. delete The method according to claim 1,
Wherein the number of the first lenses of the first lens unit and the number of the second lenses of the second lens unit are equal to the number of LEDs of the LED array, respectively. delete The method according to claim 1,
The distance between the first fastening hole and the first lens, and the distance between the second fastening hole and the second lens are the same,
Wherein an angle between the two adjacent first lenses and an angle between two adjacent second lenses are the same. The method according to claim 1,
And a plurality of first lenses of the first lens unit are rotated to surround the respective LEDs of the LED array as the first lens unit is rotated by a predetermined angle around the first fastening hole. Device. The method according to claim 1,
Wherein the first lens unit is configured such that a plurality of first lenses are symmetrical with respect to the longitudinal direction of the substrate around the first fastening hole and are symmetrical along the width direction of the substrate. The method according to claim 1,
Wherein the second lens unit is provided such that the plurality of second lenses are symmetrical about the longitudinal direction of the substrate about the second fastening hole and are not symmetrical along the width direction of the substrate. Heat sink;
A first light emitting unit including a first substrate mounted on the heat sink and a plurality of LED arrays mounted on the first substrate;
A first lens array mounted on the first light emitting unit;
A second light emitting unit including a second substrate mounted on the heat sink and a plurality of LED arrays mounted on the second substrate;
A second lens array mounted on the second light emitting unit; And
And a power unit for supplying power to the first and second light emitting units,
The first lens array and the second lens array each include a first lens unit having a plurality of first lenses having a first light distribution curve and a second lens unit having a second lens having a second light distribution curve different from the first light distribution curve, At least one of < RTI ID = 0.0 >
The light distribution characteristics of the first and second lens arrays are set such that the number of the first and second lens units, the arrangement order of the first and second lens units, and the order of the first and second lens units, The angle of rotation is changed based on at least one of the angles,
Each LED array includes a plurality of LEDs arranged along the circumferential direction,
Wherein the first lens unit and the second lens unit are provided with first and second fastening holes respectively at a central portion thereof,
The plurality of first lenses are provided along the circumferential direction around the first fastening hole so as to correspond to the positions of the LEDs of the LED array,
And the plurality of second lenses are provided along the circumferential direction around the second fastening hole so as to correspond to positions of the LEDs of the LED array. 11. The method of claim 10,
Further comprising a side substrate having a first connector and a second connector respectively electrically connected to the first light emitting unit and the second light emitting unit. 11. The method of claim 10,
Wherein the first lens array includes the first lens unit,
Wherein the second lens array comprises at least one first lens unit and at least one second lens unit. A light emitting unit including a substrate and a plurality of LED arrays mounted on the substrate;
A lens array mounted on the light emitting unit; And
And a power unit for supplying power to the light emitting unit,
Wherein the lens array includes a plurality of lenses each having the same light distribution curve and each of which surrounds each LED array individually,
At least two or more lens units are mounted at different angles with respect to the center of the LED array,
Each LED array includes a plurality of LEDs arranged along the circumferential direction,
Wherein the plurality of lens units are each provided with a fastening hole at a central portion thereof,
And the plurality of lenses are provided along the circumferential direction around the fastening hole so as to correspond to positions of the LEDs of the LED array.

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