KR20170037136A - Lighting apparatus - Google Patents

Abstract

A lighting apparatus according to an embodiment includes: a housing having first and second back covers; first and second recesses disposed on opposite sides of the housing in a first axis direction and having a parabolic form by which lower sides of the first and second back covers are opened; a heat dissipating body disposed between the first and second recesses in a second axis direction; first and second light emitting modules disposed on opposite sides of the housing and having a plurality of light emitting diodes; a first transmissive sheet disposed in a diagonal form in the first recess of the housing to diffuse light emitted from the first light emitting module; a second transmissive sheet disposed in a diagonal form in the second recess of the housing to diffuse light emitted from the second light emitting module; a first reflective sheet attached to one of inner surfaces of the first and second recesses corresponding to an area that is adjacent to the light emitting diode to reflect first side light emitted from the plurality of light emitting diodes; and a second reflective sheet attached to one of the inner surfaces of the first and second recesses between the first reflective sheet and upper ends of the first and second transmissive sheets. The heat dissipating body includes first and second reflection units extending to lower ends of the first and second transmissive sheets, and a third reflective sheet having a plurality of reflective surfaces having different radii of curvature is provided on the first and second reflective units. The third reflective sheet includes a scattered reflective sheet. Accordingly, the evenness of light may be improved.

Description

LIGHTING APPARATUS

An embodiment relates to a lighting device.

In general, a lighting device using LEDs generates a high temperature when turned on. This heat results in a reduction in the life of the lamp and the various components supporting it.

When a lighting device using an LED is used, a problem of hot spot may occur. There is a need for a lighting structure to reduce the problems of such hot spots and to prevent glare.

An embodiment provides a flat panel illumination device.

An embodiment provides a lighting device having a light emitting diode.

The embodiment provides an illumination device for preventing blindness.

The embodiment provides an illumination device that reflects both side light of a plurality of light emitting diodes to a light transmitting sheet.

The embodiment provides an illuminating device that uniformly irradiates the side light emitted from the light emitting diode with regular reflection and non-reflection to the light transmitting sheet.

The embodiment provides an illumination device that improves the uneven light distribution in a specific region of the light-transmitting sheet by the side light emitted from the light-emitting diode.

A lighting apparatus according to an embodiment is characterized in that the lighting apparatus disclosed in the embodiment includes: a housing having first and second back covers; First and second recesses disposed on both sides of the housing in the first axial direction and having a parabolic shape in which a lower portion of the first and second back covers is opened; A heat dissipator disposed in a second axial direction between the first and second recesses; First and second light emitting modules disposed on opposite sides of the heat discharging body and having a plurality of light emitting diodes; A first light-transmissive sheet disposed diagonally in a first recess of the housing and diffusing light emitted from the first light-emitting module; A second light-transmitting sheet disposed diagonally to a second recess of the housing and diffusing light emitted from the second light emitting module; A first reflective sheet attached to a surface of an inner surface of the first and second recesses adjacent to the light emitting diode and reflecting the first side light emitted from the plurality of light emitting diodes; And a second reflective sheet attached to a surface of the first and second recesses between the first reflective sheet and the upper ends of the first and second transparent sheets, And a third reflecting sheet having first and second reflecting portions extending to a lower end of the second light transmitting sheet and having a plurality of reflecting surfaces having different radii of curvature on the first and second reflecting portions, 3 The reflective sheet includes a reflective sheet.

The embodiment can provide a new flat panel illumination device.

Embodiments can improve the uniformity of the light in the illumination device and improve the eye concavity.

The embodiment can reflect the side light of a plurality of light emitting diodes to improve the eyeball refraction in the light transmitting sheet.

The embodiment can improve the light distribution at narrow intervals between the upper surface of the recess in the back cover and the oblique light-transmissive sheet.

The embodiment can improve the reliability of the lighting apparatus.

1 is an exploded perspective view of a lighting apparatus according to an embodiment.
2 is an assembled perspective view of the illumination device of FIG.
3 is a side cross-sectional view of the illumination device of Fig.
Fig. 4 is a partial enlarged view of the illumination device of Fig. 2; Fig.
Fig. 5 is an exploded perspective view of the heat dissipator and the front cover of Fig. 1;
Fig. 6 is a partial enlargement of the heat radiator and the front cover of Fig. 1;
7 is an assembled perspective view of the heat dissipator and the front cover of Fig.
Fig. 8 is an enlarged view of the first back cover of the illumination device of Fig. 3, showing the comparison of the respective reflection areas in the first recess. Fig.
Fig. 9 is an enlarged view of the first back cover of the lighting device of Fig. 3;
10 is a view showing first and third reflective sheets on the first back cover of Fig.
11 is a view showing the optical path by the third reflection sheet in the first back cover of the illumination device of Fig.
Fig. 12 is a partial enlargement of Fig. 11 for explaining a problem due to the interval between the light-transmitting sheet and the recess top surface.
13 is a side sectional view showing a light emitting diode according to an embodiment.

Hereinafter, preferred embodiments of a lighting module or a lighting device having a heat radiating structure according to an embodiment will be described with reference to the accompanying drawings. The terms described below are defined in consideration of the functions in the present embodiment, and this may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification. In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as an example, and various embodiments may be implemented through the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. As used herein, the term "lighting module or lighting device" is used to refer to devices used for indoor or outdoor use, such as flat plates, lamps, street lamps, various lamps, electric sign boards, I will reveal.

1 is an exploded perspective view of the illumination device according to the embodiment, Fig. 2 is an assembled perspective view of the illumination device of Fig. 1, Fig. 3 is a side sectional view of the illumination device of Fig. 2, Fig. 5 is an exploded perspective view of the heat radiator and the front cover of Fig. 1, Fig. 6 is a partial enlargement of the heat radiator and the front cover of Fig. 1, and Fig. 7 is an exploded perspective view of the heat radiator and front cover of Fig. to be.

1 to 7, the lighting apparatus 100 includes a housing 110 having a back cover 111, 112 having a bottom open recess 115, 115A, The light emitting modules 170 and 170A disposed on both sides of the heat discharging body 150 and the light transmitting sheets 180 and 182 disposed on the recesses 115 and 115A of the back covers 111 and 112, ).

Referring to FIGS. 1 to 3, the housing 110 includes a back cover 111, 112 having recesses 115, 115A which are convexly recessed at the bottom. The back covers 111 and 112 may include first and second back covers 111 and 112 symmetrical with respect to a straight line in the center-side second axis Z direction. The recesses 115 and 115A may have a shape symmetrical to each other with respect to a straight line in the direction of the second axis Z from the lower center of the housing 110. [

The inner surfaces of the first and second back covers 111 and 112 may include recesses 115 and 115A having a parabola shape or an ellipse shape. The outer shape of the first and second back covers 111 and 112 may include a plurality of parabolic shapes, a plurality of lip shapes, a hyperbola, or a pair of curved surfaces, but is not limited thereto. The recesses 115 and 115A can be divided into first and second recesses 115 and 115A disposed on both sides of the housing 110 in the direction of the second axis Z of the center side. The lower portion of the first back cover 111 may be opened in the first recess 115 and the lower portion of the second back cover 112 may be opened in the second recess 115A.

A heat dissipating member, for example, the heat dissipating member 150 may be disposed in a region between the first and second recesses 115 and 115A.

The first and second back covers 111 and 112 may have a line-symmetrical shape with respect to the center-side second axial direction Z. Power supply devices (not shown) may be provided on the back covers 111 and 112, but the present invention is not limited thereto.

The housing 110 may have both side walls of the recesses 115 and 115A, and both side walls may be disposed facing each other with respect to the second axis Z direction. A reflective sheet (not shown) may be further disposed on the surfaces of both sidewalls of the recesses 115 and 115A for reflecting light, but the present invention is not limited thereto. The depth of the recesses 115 and 115A may become deeper toward the center area of the back covers 111 and 112. The first and second recesses 115 and 115A may be different illumination regions.

2 and 3, the housing 110 has a length X1 in the first axis X direction and a length Z1 in the second axis Z direction in the same direction Or may be different, but is not limited thereto.

The thickness Y1 or the height of the housing 110 or the back covers 111 and 112 may be 1/10 or less of the length in the first axis X direction and / or the second axis Z direction, Lt; / RTI > A lighting device having a slim thickness is provided by arranging the thickness Y1 of the back covers 111 and 112 to be 1/10 or less of the lengths in the first axis X direction and / or the second axis Z direction can do. The direction of the first axis X is a transverse direction or the width direction of the housing 110 and the direction of the second axis Z is an axial direction orthogonal to the first axis X direction, . The third axis Y direction may be a height or a thickness direction. Here, the size (X1 * Z1) of the illumination device is 550 to 600 mm * 550 to 600 mm, and the thickness or height Y1 may be in a range of 50 to 52 mm, but is not limited thereto.

A receiving protrusion 113 may be disposed outside the lower surface 114 of the housing 110 and the receiving protrusion 113 may be coupled to another structure such as a ceiling. 1, a plurality of fastening protrusions 90 may protrude from the center side connecting portion 117 of the housing 110. The fastening protrusions 90 may be a component such as a boss, It may be a fastening means such as a rivet. The connection portion 117 may be provided with a fastening hole into which a fastening means such as a screw is inserted, but the present invention is not limited thereto. Since the plurality of fastening protrusions 90 are coupled through the heat discharging body 150, the flow of the heat discharging body 150 can be suppressed.

3, a plurality of fastening holes 105 may be formed in the first and second back covers 111 and 112 of the housing 110 so as to be fastened to other structures.

The housing 110 may include a plastic material such as polycarbonate, polyethylene terephthalate glycol (PETG), polyethylene (PE), polystyrene paper (PSP), polypropylene (PP) And PVC (polyvinyl chloride).

The back covers 111 and 112 may be made of a material having a reflectance higher than the transmittance and a reflectance of 70% or more, for example, 80% or more. By increasing the reflectance of the back covers 111 and 112, light incident on the surfaces of the back covers 111 and 112 can be reflected. The back covers 111 and 112 may be made of a material having a light absorptance of 20% or less, for example, 15% or less, but the present invention is not limited thereto.

The heat discharging body 150 may be made of a metal material and may include at least one of metals such as aluminum, copper, nickel, and silver, but is not limited thereto. The heat discharging body 150 may include a carbon material, but the present invention is not limited thereto.

3 to 6, the heat discharger 150 includes heat radiating portions 151 and 151A disposed on the opposite sides and heat radiating portions 151 and 151A having a predetermined curvature from the heat radiating portions 151 and 151A, And reflectors 153 and 153A extending in the lower end direction.

The heat dissipation units 151 and 151A may include a flat vertical surface, and may be opposed to the light transmitting sheets 180 and 182. The heat dissipation units 151 and 151A include a first heat dissipation unit 151 disposed at one side of the first recess 115 and a second heat dissipation unit 151A disposed at one side of the second recess 115A . The first heat-radiating portion 151 and the second heat-radiating portion 151A may be disposed in opposite directions with respect to the heat-radiating body 150.

The flat surfaces of the first and second heat dissipation units 151 and 151A may be disposed in the third axis Y direction and may be disposed at right angles to the first axis X direction.

The heat dissipating unit 150 may include a heat dissipating hole 159 in which an area between the heat dissipating units 151 and 151A is opened. (Z) direction. The side surface of the heat dissipation hole 159 may be polygonal or circular, but the present invention is not limited thereto.

The heat discharging body 150 may include an upper frame 159A disposed on the heat dissipating hole 159 and a lower frame 159B disposed below the heat dissipating hole 159. [ The upper and lower frames 159A and 159B may be bent and extended from the heat radiating portions 151 and 151A.

The heat dissipation holes 159 may be disposed between the heat dissipation units 151 and 151A and the upper / lower frames 159A and 159B. The upper frame 159A and the lower frame 159B are provided with a plurality of projection insertion holes 91 so that the locking projections 90 of the housing 110 can be inserted. The fastening hole 92 may be disposed along the fastening frame 157 as shown in FIG. 6 in the front cover 155 corresponding to the projection insertion hole 91. So that it can be fastened to the fastening hole 92 of the front cover 155 through the fastening protrusion 90 by using the fastening means 19 on the housing 110 of FIG.

Light emitting modules 170 and 170A are disposed on the first and second heat dissipating units 151 and 151A and light traveling toward the center among the light emitted from the light emitting modules 170 and 170A is irradiated onto the light transmitting sheets 180 and 182 . This can be defined as direct lighting.

As shown in FIG. 4, the reflective portions 153 and 153A may be disposed below the heat dissipation portions 151 and 151A. The reflectors 153 and 153A may extend integrally from the heat radiating portions 151 and 151A. The reflectors 153 and 153A may include a plurality of reflection areas having surfaces having different radii of curvature and reflecting incident light. The reflective portions 153 and 153A include first and second reflective portions 153 and 153A extending from the respective heat radiating portions 151 and 151A.

The first reflecting portion 153 is disposed between the first heat radiating portion 151 and the front cover 155 and the second reflecting portion 153A is disposed between the second radiating portion 151A and the front cover 155. [ (155).

The first reflecting portion 153 may extend from the first heat radiating portion 151 to the outer side of the lower end of the first light transmitting sheet 180. The second reflective portion 153A may extend from the second heat dissipation portion 151A to the outside of the lower end portion of the second light transmitting sheet 182. [ The inner surface of the first reflective portion 153 may include a reflective region having a different radius of curvature and the inner surface of the second reflective portion 153A may include a reflective region having a different radius of curvature. The inner surfaces of the first and second reflectors 153 and 153A may be disposed in the directions of the first and second recesses 115 and 115A.

The reflectors 153 and 153A are disposed adjacent to the lower portions of the light emitting modules 170 and 170A to transmit the side light proceeding downward from the light emitted from the light emitting diodes 173 to the light transmitting sheets 180 and 182 and the back covers 111 and 112 As shown in FIG. The third reflective sheet 162 may be disposed on the inner surface of the reflective portions 153 and 153A, or may be coated with a reflective material, or the metal surface of the heat discharger 150 may be exposed. The upper ends of the reflectors 153 and 153A may overlap the light emitting diodes 173 of the light emitting modules 170 and 170A in the vertical direction to effectively reflect the incident light.

Referring to FIGS. 4, 6 and 7, the heat discharging body 150 may include reflective frames 154 and 154A on the upper outer side, and the reflective frames 154 and 154A may be disposed outside the upper frame 159A And can be bent outwardly from the first and second heat radiating portions 151 and 151A in the first and second recess directions, for example. The reflection frames 154 and 154A may overlap with the light emitting modules 170 and 170A in a vertical direction and may reflect light emitted upward from the light emitting diode 173. The reflection frames 154 and 154A may be adhered or adhered on the lower surface (117A in FIG. 4) of the center side connection portion 117 of the housing 110.

4 to 7, the front cover 155 may be disposed below the heat discharging body 150. [ The front cover 155 may include a metallic material or a non-metallic material, and may be coupled to the heat discharging body 150. When the front cover 155 is made of a metal material, the heat transmitted from the heat discharging body 150 can be dissipated to the outside. When the heat discharging body 150 is made of a non-metallic material, for example, a plastic material, the front cover 155 can be designed in various ways.

The front cover 155 may include a fixing frame 157 disposed below the lower frame 159B of the heat discharging body 150 and a cover plate 156 disposed below the fixing frame 157. [

The fixing frame 157 of the front cover 155 has a plurality of fastening holes 92 and is inserted into the receiving groove 153B of the lower frame 159B of the heat discharging body 150, A fastening member (19 in FIG. 1) fastened through the heat discharging body 150 can be fastened. Accordingly, the front cover 155 may be fixed to the heat discharging body 150, and the heat discharging body 150 may be fixed to the housing.

The cover plate 156 of the front cover 155 extends into the regions of the first and second recesses 115 and 115A and may be curved or inclined. The cover plate 156 may be formed symmetrically with respect to the center in the second axis Z direction.

4 and 6, the heat discharging body 150 includes a protrusion protrusion 62 protruding from the end portion 61 of the first and second reflecting portions 153 and 153A toward the front cover or downward can do. The end portions 61 of the first and second reflecting portions 153 and 153A and the cover plate 156 of the front cover 155 are spaced apart from each other and the ends of the first and second reflecting portions 153 and 153A 61 and the cover plate 156 may be provided with a latching groove 158 and the lower ends of the light transmitting sheets 180 and 182 may be respectively disposed in the latching groove 158. The prevention protrusions 62 may be disposed to face one side of the light transmitting sheet 180, 182, respectively.

As shown in FIGS. 1, 4 and 7, the light emitting modules 170 and 170A may be disposed on the heat radiating portions 151 and 151A of the heat discharging body 150. The light emitting modules 170 and 170A include a first light emitting module 170 disposed on the first heat dissipating unit 151 and a second light emitting module 170A disposed on the second heat dissipating unit 151A .

Each of the light emitting modules 170 and 170A includes a circuit board 171 and a plurality of light emitting diodes 173 disposed on the circuit board 171. The circuit board 171 may be extended in the direction of the third axis Y and may be arranged in the direction of the second axis Z. The plurality of light emitting diodes 173 may be arranged on the circuit board 171, (Z) direction. The first and second light emitting modules 170 and 170A may be arranged in directions opposite to each other in a region between the first and second recesses 115 and 115A.

The circuit board 171 may be disposed on the heat dissipation units 151 and 151A in a longitudinal direction (Z-axis direction) of the heat dissipation unit 150. The circuit board 171 may be disposed on one or more of the heat dissipation units 151 and 151A, but the present invention is not limited thereto.

The circuit board 171 may be attached to the heat dissipation units 151 and 151A by screws or / and adhesives, but the present invention is not limited thereto.

The circuit board 171 may include, for example, a printed circuit board (PCB). The printed circuit board includes at least one of a resin material PCB, a metal core PCB (MCPCB), and a flexible PCB (FPCB), and may be provided as a metal core PCB for heat radiation, for example.

The light emitting diode 173 may emit light of at least one of blue, red, green, white, and UV as a package in which the light emitting chip is packaged. For example, white light may be emitted for illumination. The light emitting diode 173 may be mounted on the circuit board 171 in a chip form. In this case, the light emitting diode 173 may have an orientation angle of 115 degrees or more, for example, 118 degrees or more. The orientation angle of the light emitting diode 173 may vary depending on the structure of the package or the cavity in the package, but the present invention is not limited thereto.

The light emitting diodes 173 may be arranged on the circuit board 171 in one row or two or more rows, but the present invention is not limited thereto.

The light emitting diode 173 according to the embodiment may include a warm white LED and a cool white LED on the circuit board 171, for example. The warm white light emitting element and the cool white light emitting element emit white light. The warm white light emitting element and the cool white light emitting element can emit the white light of the mixed light by radiating the correlated color temperature, so that the color rendering index (CRI) indicating the close proximity to the natural sunlight becomes high. Therefore, it is possible to prevent the color of the actual object from being distorted and to reduce the fatigue of the user's eyes.

3, a first light transmitting sheet 180 may be disposed on the first recess 115, and a second light transmitting sheet 182 may be disposed on the second recess 115A. The upper end of the first light transmitting sheet 180 is disposed in the latching groove 118 on the latching protrusion 125 of the first recess 115 and the lower end of the first light transmitting sheet 180 is connected to the first reflecting portion 153 of the heat discharging body 150, And the front cover 155, as shown in Fig. Both end portions of the second light transmitting sheet 182 can be disposed between the latching groove 118 of the latching protrusion 125A and the latching groove 158. [ The latching protrusions 125 and 125A may be disposed at predetermined positions on the upper surfaces of the first and second recesses 115 and 115A and may be disposed adjacent to the upper center of the first and second recesses 115 and 115A . The latching protrusions 125 and 125A protrude from the upper surfaces of the back covers 111 and 112 toward the first and second recesses 115 and 115A, respectively. The latching protrusions 125 and 125A may be disposed along the second axis Z in the top surface center of the first and second recesses 115. [ The latching protrusions 125 and 125A may be disposed outside the upper ends of the first and second light transmitting sheets 180 and 182. The latching protrusions 125 and 125A may be made of the same material as that of the first and second back covers 111 and 112 or may be made of different materials.

The light transmitting sheet 180, 182 may be a sheet having a diffusing agent or may include a diffusion sheet material. The light transmitting sheets 180 and 182 may include at least one of a diffusion sheet such as polymethyl methacrylate (PMMA), polypropylene (PP), polyethylene (PE), and polystyrene (PS).

The light transmitting sheet 180, 182 may include a plurality of layers, for example, a diffusion film and a diffusion plate on the diffusion film. The diffusion film may include at least one of PET (polyethylene terephthalate), PS, and PC, and the diffusion plate may include at least one of PC, PS, and PMMA. The diffusion film diffuses the incident light, and the diffusion plate has a thickness greater than the thickness of the diffusion film, diffuses the light passing through the diffusion film, and prevents the diffusion plate from being struck.

Since the first recess 115 of the first back cover 111 is disposed in the same structure as the second recess, the structure of the second recess will be omitted below, and the first recess will be described with reference to the first recess do.

8 and 9, the light transmitting sheet 180 may be disposed in an oblique direction with respect to the optical axis X0. The upper end of the light transmitting sheet 180 may be disposed on the latching protrusion 125 and the lower end of the light transmitting sheet 180 may be disposed on the cover plate 156 of the front cover 155. The front cover 155 or the cover plate 156 may be disposed at a lower position than the latching protrusion 125.

The light transmitting sheet 180 may be inclined at a predetermined angle? 1 with respect to a horizontal straight line on the center side lower surface of the housing 110. The light transmitting sheet 180 may be arranged diagonally with respect to the optical axis X0 at the respective recesses 115 of the back cover 111. [ The inclined angle? 1 of the translucent sheets 180 and 182 is not more than 45 degrees with respect to the horizontal straight line of the lower surface of the housing 110, for example, at an angle? 1 ranging from 9 degrees to 13 degrees with respect to the optical axis X0 And may be arranged at an inclination in the range of, for example, 11 degrees to 12 degrees. When the inclined angle [theta] 1 of the light transmitting sheet 180 is out of the above range, the light reflected in the recess 115 may not be uniformly distributed, and the light directly incident on the light transmitting sheet 180 It is impossible to provide a uniform luminance distribution.

The translucent sheet 180 is inclined at the above-mentioned angle? 1, so that it can correspond to the light emitting diode 173 in the horizontal direction. The light transmitting sheet 180 may receive light reflected through the surface of the first recess 115 and diffuse it.

The light emitting surface of the light emitting diode 173 or the back surface of the circuit board 171 may be arranged at a right angle or in a range of 89 degrees to 91 degrees with respect to the horizontal first axis X. [ Accordingly, the light emitted from the light emitting diode 173 can be directly irradiated onto the entire regions B1, B2, and B3 of the light transmitting sheet 180. The light transmitting sheet 180 may be directly irradiated with light emitted from the light emitting diode 173 and diffused by the inclined angle? 1. As another example, when the light emitting diode 173 is out of the angle with respect to the first axis X, the light emitted from the light emitting diode 173 is not irradiated to a part of the light transmitting sheet 180 And the reflected light can be used.

8 to 10, reflective regions M1, M2, and M3 for changing the path of light emitted from the light emitting diode 173 are disposed in the first recess 115, M1, M2, and M3, the reflective sheets 160 and 165 may be attached.

 The inner surface of the back cover 111 may be divided into a plurality of reflection areas M1 and M2 disposed between the light emitting diode 173 and the upper end of the light transmitting sheet 180. [ The reflective areas M1 and M2 may include a first reflective area M1 adjacent to the light emitting diode 173 and a second reflective area M1 disposed between the first reflective area M1 and the upper end of the light transmitting sheet 180. [ Area M2.

The first reflective region M1 may be a portion of the inner surface of the first recess 115 from the highest point of the first recess 115 to the surface of the region adjacent to the light emitting diode 173. The second reflective region M2 may be a portion of the inner surface of the first recess 115 from the highest point of the first recess 115 to a region adjacent to the upper end of the light transmitting sheet 180. [ That is, the boundary portion between the first and second reflection regions M1 and M2 may be the high point portion of the first recess 160, but the present invention is not limited thereto.

The first reflective area M1 may reflect the first side light L1 from the light emitted from the light emitting diode 173 to the second reflective area M2. The second reflective area M2 may reflect the light emitted from the light emitting diode 173 and the light reflected from the first reflective area M1 to the light transmitting sheet 180. [ The first reflective region M1 may include a plurality of reflective surfaces or inclined surfaces having different radii of curvature. The second reflective area M2 may include a plurality of reflective surfaces or planes having different radii of curvature.

8 and 9, the first reflection area M1 is a regular reflection area, and the second reflection area M2 is a non-reflection area of incident light L1, L2, L3. have. The first and second reflection areas M1 and M2 may be disposed above the optical axis X0. Also, the latching protrusion 125 may be spaced apart from the optical axis X0 by a predetermined distance d1.

The first and second reflective regions M1 and M2 may be disposed within the region of the directional angle with reference to the optical axis X0 of the light emitting diode 173. [ Both ends of the first reflection region M1 may form an angle R3 ranging from 28 degrees to 33 degrees with the light emitting diode 173 as a starting point P. [ When the angle R3 between the both ends of the first reflection area M1 and the starting point P of the light emitting diode 173 is larger than the range, the light reflected from the first reflection area M1 is transmitted The sheet 180 may be irradiated with a bright line. When the angle R3 is smaller than the range, the light reflected from the first reflective area M1 may be uniformly reflected in the second reflective area M2 There is a problem in that the light distribution is not uniform. The first reflection area M1 may be arranged in an angle range that allows the right side light L1 incident thereon to be specularly reflected to different areas of the second reflection area M2. Here, the starting point P may be the center of the emitting surface of the light emitting diode 173.

The angle R3 may be wider than the angle R4 formed by both ends of the second reflective region M2 as a starting point P of the light emitting diode 173. [ Both ends of the second reflective area M2 may have an angle ranging from 21 degrees to 26 degrees with the light emitting diode 173 as a starting point P. An angle R3 formed by the first reflective area M1, . Both ends of the second reflection region M2 are arranged at the angle R4 at the center P of the exit surface of the light emitting diode 173 so that light reflected through the first reflection region M1, The light reflected through the third reflection area M3 and the light emitted from the light emitting diode 173 may be reflected to the entire area of the light transmitting sheet 180. [ If the second reflection area M2 is larger than the angle R4, a decrease in brightness may occur. If the second reflection area M2 is smaller than the angle R4, the light uniformity may decrease.

A straight line perpendicular to the starting point P of the light emitting diode 173 can be defined as an optical axis X0. The first light transmitting sheet 180 has a first point Px intersecting with the optical axis X0 and the first point Px is located at a half or more point from the top of the light transmitting sheet 180, / 3 < / RTI > The second point Py may be one third from the top of the light transmitting sheet 180.

The upper end of the light transmitting sheet 180 and the first point Px may have an angle R1 less than 10 degrees from the light emitting diode 173 as a starting point P and are not limited thereto. When the angle R1 is 10 degrees or more, a bright line may be generated by the light directly incident on the light transmitting sheet 180. [ The angle R1 may vary depending on the inclined angle of the light transmitting sheet 180, but is not limited thereto.

The angle R1 + R2 formed by both ends of the light transmitting sheet 180 at the starting point P of the light emitting diode 173 is set to an angle formed by the first reflection area M1 or the second reflection area M2 R3, R4, and may range, for example, from 34 degrees to 39 degrees. When the angle (R1 + R2) formed by both ends of the light transmitting sheet 180 is less than the above range, the light diffusion effect is reduced and the light uniformity can be reduced. If the angle is larger than the above range, There is a problem that can be increased.

The reflective portion 153 may be a third reflective region M3 and the third reflective region M3 may reflect incident light to the second reflective region M2 and / or the light transmitting sheet 180 . The angle R5 formed by both ends of the lower third reflective area M3 at the starting point P of the light emitting diode 173 is an angle formed by the first reflective area M1 or the second reflective area M1 (R3, R5). The third reflection area M3 may be a regular reflection area or a non-reflection area. The third reflective area M3 may reflect the incident light to the second reflective area M2 and the light transmitting sheet 180 to suppress the generation of a bright line in the light transmitting sheet 180. [ A region of the third reflective region M3 adjacent to the light emitting diode 173 covers a region of the light emitting diode 173 which is out of the directivity angle, thereby reducing light leakage.

At least one of the reflection areas M1, M2, and M3 may include a reflective sheet. For example, as shown in FIGS. 9 and 10, reflective sheets 160, 162, and 165 may be disposed on the inner surface of the back cover 111 and the reflective portion 153. The reflective sheets 160, 162, and 165 may include first to third reflective sheets 160, 165, and 162.

The first reflective sheet 160 may be disposed on the first reflective area M1 and the second reflective sheet 165 may be disposed on the second reflective area M2. A third reflective sheet 162 may be disposed in the third reflective area M3. The first reflective sheet 160 may be attached to the surface of the region adjacent to the light emitting diode 173 from the highest point of the recess 115 among the inner surfaces of the recesses 115. [ The second reflective sheet 165 may be attached to the inner surface of each of the recesses 115 from the highest point of the recess 115 to a region adjacent to the upper end of the transparent sheet 180. That is, the boundary portion between the first and second reflective sheets 1601 and 655 may be the highest point of the recess 160.

The third reflective sheet 162 may be disposed adjacent to the light emitting diode 173 rather than the first reflective sheet 160. The first and second reflective sheets 160 and 165 may be disposed corresponding to the light transmitting sheet 180. 8, both ends of the first reflective sheet 160 may be disposed at the center of the exit surface of the light emitting diode 173 in the range of the angle R3 as a starting point P, Both ends of the third reflective sheet 162 may be arranged in the range of the angle R4 with the both ends of the light emitting diode 173 at the center P1 of the exit surface of the light emitting diode 173, 173 may be arranged in the range of the angle R5 as the starting point P2.

9 and 10, the gap G1 between the transparent sheet 180 and the upper surface of the first recess 115 is smaller than the gap G1 between the upper surface of the first recess 115 and the upper surface of the first recess 115, 125). ≪ / RTI > This gap G1 may be a space where light is mixed on the light transmitting sheet 180. [

The first reflective sheet 160 may include a material different from the second reflective sheet 165. The first reflective sheet 160 may include a reflective sheet or a mirror sheet, and the second reflective sheet 165 may include a reflective sheet or a white sheet. The first reflective sheet 160 includes Ag and Al. The second reflective sheet 165 may be made of a white plastic material such as polycarbonate (PC) or polypropylene (PP), a nano-coated layer, or a metal layer or a resin layer having a pattern formed thereon.

The third reflective sheet 162 may be a reflective sheet or a white sheet, or may include the same material as the second reflective sheet 165.

11 and 12, when the third reflective sheet 162 is an Ag sheet, the second side light L2 of the light emitting diode 173 is incident on the third reflective sheet 162, And the light L10 and L11 reflected from the third reflection sheet 162 may be reflected by the second reflection sheet 165. [ For example, some of the light L10 and L11 reflected from the third reflection sheet 162 may be transmitted to the light transmitting sheet 180 by light sufficiently diffused by the gap G1 with the light transmitting sheet 180 Can be entered. However, when some light L11 from the light L10 and L11 reflected from the third reflection sheet 162 is diffused by the second reflection sheet 162 adjacent to the upper end of the light transmission sheet 180, There is a problem that the light diffusion is not performed by the narrow gap G1 and the nonuniform distribution is formed in the upper end region B11 of the light transmitting sheet 180. [

Even if the interval G1 between the light transmitting sheet 180 and the second reflecting sheet 165 is narrowed by arranging the third reflecting sheet 162 as the diffusing sheet or the light reflecting sheet, Uniform distribution due to the light reflected from the third reflective sheet 162 in the upper end area B11 of the second reflective sheet 160 (180).

Referring to Figures 8-10, the first, second and third reflective sheets 160,165, 162 according to an embodiment may include curved surfaces having a plurality of inflection points, which reflect light to a desired optical path You can give.

The first and second reflective sheets 160 and 165 include a material having a light reflectance of 90% or more. The light reflected by the first and second reflective sheets 160 and 165 can be reflected without loss, and the light extraction effect can be improved.

Here, at least one of the first and second reflective sheets 160 and 165 may be removed, but the present invention is not limited thereto.

When the light reflected from the first and third reflective sheets 160 and 162 is reflected by the second reflective sheet 165 and is incident on the different areas B1, B2, and B3, Thereby diffusing the transmitted light. Accordingly, it is possible to prevent the occurrence of a bright line in the light-transmitting sheet 180 by the direct incident light and indirectly incident light, and to prevent the eye lobe.

The minimum distance between the center of the emitting surface of the light emitting diode 173 and the first reflecting sheet 160 may be in a range of 8 mm or more, for example, 9 mm to 11 mm. When the minimum distance between the center of the emitting surface of the light emitting diode 173 and the first reflective sheet 160 is smaller than the above range, light deviating from the directivity angle may be incident, and the improvement of the reflection efficiency may be insignificant. It is difficult to control the path through which the light is reflected and leakage of the side light may occur.

The minimum distance between the center of the emitting surface of the light emitting diode 173 and the third reflective sheet 162 may be 5 mm or less, for example, 4 mm to 4.8 mm, The installation may not be easy, and leakage of the side light may occur if it is larger than the above range.

The minimum distance between the center of the emitting surface of the light emitting diode 173 and the light transmitting sheet 180 may be at least two times the minimum distance between the light emitting diode 173 and the first reflecting sheet, have. When the minimum distance between the center of the light emitting diode 173 and the light transmitting sheet 180 is larger than the above range, the inclination becomes too large to uniformly control the light distribution. If the light scattering sheet 180 is smaller than the above range, Lt; / RTI >

The first reflective sheet 160 may include a plurality of reflective surfaces having different curvature radii, and the plurality of reflective surfaces may include curved surfaces having a positive curvature radius. The radius of curvature of the plurality of reflection surfaces may become larger as the distance from the light emitting diode 171 increases. The plurality of reflection surfaces may be at least three or more, and may include, for example, three to five surfaces. When the number of the reflection surfaces is too small, it is difficult to control the dispersion of light, and when too many, the brightness of reflected light may be deteriorated. Each of the plurality of reflective surfaces may reflect the incident light to different areas of the second reflective sheet 165.

The third reflective sheet 162 may be disposed between the lower end of the light transmitting sheet 180 and the light emitting diode 173. The third reflective sheet 162 may be disposed between the lower end of the light transmitting sheet 180 and the front cover 155. The third reflective sheet 162 may include a plurality of reflective surfaces having different radii of curvature. The reflective surface of the third reflective sheet 162 may become larger as the radius of curvature thereof increases away from the light emitting diode 173.

The third reflective sheet 162 is disposed in a parabolic shape in a region between the light emitting diode 173 and the light transmitting sheet 180 to reflect the incident light to the second reflective sheet 165 and the light transmitting sheet 180 So that light is uniformly irradiated onto the light transmitting sheet 180, and the generation of a bright line due to the light directly irradiated can be suppressed.

The first and third reflective sheets 160 and 165 are formed in the center area B2 by irradiating light to the center area B2 of the light transmitting sheet 180, Can be reduced by indirectly incident light.

The second reflective sheet 165 according to the embodiment reflects light incident from the first reflective sheet 160 and the light emitting diode 173 to uniformly irradiate the center region B2 of the transparent sheet 180 It is possible to suppress the generation of a bright line due to light directly incident on the light transmitting sheet 180 from the light emitting diode 173. The light reflected by the third reflective sheet 162 is reflected by the second reflective sheet 165 or irradiated onto the upper areas B1 and B2 of the transparent sheet 180 so that light from the light emitting diode 173 It is possible to remove a bright line caused by the light directly incident on the light transmitting sheet 180.

The first to third reflective sheets 160, 165 and 162 improve the uniformity of the distribution of the light directly irradiated to the light-transmitting sheets 180 and 182 by the light emitting diode 173, thereby eliminating the bright line of the light-incident portion.

The Unified Glare Rating (UGR) of the lighting apparatus of the present invention has 19 or less, indicating that the user does not have an unpleasant Claire. In the CIE criteria, users are classified as having discomfort when the Discomfort Index (UGR) is 21 or more.

Table 1 shows UGR, light efficiency, and light uniformity of the illumination apparatus according to the embodiment.

UGR Light efficiency Uniformity Endwise (horizontal) Crosswise (portrait) 18.2 19.0 85.1% 82.2%

Here, the size of the lighting apparatus is 550 to 600 mm * 550 to 600 mm, and the thickness or height is in the range of 50 to 52 mm. The directivity angle of the light emitting diode may also be in the range of 120 degrees ± 5%.

≪ Light emitting device package &

13 is a side sectional view showing a light emitting diode according to an embodiment.

13, the light emitting diode 200 includes a body 210, a first lead electrode 211 and a second lead electrode 212 disposed at least partially in the body 210, The light emitting device 101 is electrically connected to the first lead electrode 211 and the second lead electrode 212 on the body 210. The molding member 210 covers the light emitting device 101 disposed on the body 210. [ (220).

The body 210 may be formed of a silicon material, a synthetic resin material, or a metal material. The body 210 includes a reflective portion 215 having a cavity and an inclined surface around the body.

The first lead electrode 211 and the second lead electrode 212 are electrically separated from each other and may be formed to penetrate the inside of the body 210. That is, some of the first lead electrode 211 and the second lead electrode 212 may be disposed inside the cavity, and other portions may be disposed outside the body 210.

The first lead electrode 211 and the second lead electrode 212 may supply power to the light emitting device 101 and reflect light generated from the light emitting device 101 to increase light efficiency, And may also function to discharge heat generated in the light emitting device 101 to the outside.

The light emitting device 101 may be mounted on the body 210 or on the first lead electrode 211 and / or the second lead electrode 212. The light emitting device 101 may be disposed as at least one LED (Light Emitting Diode) chip. The LED chip may include a light emitting diode in a visible light band such as red, green, blue or white, or a UV light emitting diode that emits ultraviolet (UV) light. A phosphor layer may be further disposed on the surface of the light emitting device 101, but the present invention is not limited thereto.

The wire 216 of the light emitting device 101 may be electrically connected to any one of the first lead electrode 211 and the second lead electrode 212, but is not limited thereto.

The molding member 220 surrounds the light emitting device 101 to protect the light emitting device 101. In addition, the molding member 220 may include a phosphor, and the wavelength of the light emitted from the light emitting device 101 may be changed by the phosphor. The upper surface of the molding member 220 may be flat, concave or convex. The upper surface of the molding member 220 may be a light exit surface and the upper surface center of the molding member 220 may be a light exit surface center or a base point.

A lens may be disposed on the molding member 220, but the present invention is not limited thereto.

The light emitting diode 200 may be a blue light emitting device or a white light emitting device having a high color rendering index (CRI). The light emitting diode may be a light emitting device that emits white light by molding a synthetic resin containing a phosphor on a blue light emitting chip. Here, the phosphor may include at least one of a garnet (YAG, TAG), a silicate, a nitride, and an oxynitride.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: illumination device 110: housing
111, 112: back cover 115, 115A: recess
150: Heat sink 160: First reflective sheet
165: second reflective sheet 162: third reflective sheet
170, 170A: light emitting module 171: circuit board
173: light emitting diode 180,182: light transmitting sheet

Claims (11)

A housing having first and second back covers;
First and second recesses disposed on both sides of the housing in the first axial direction and having a parabolic shape in which a lower portion of the first and second back covers is opened;
A heat dissipator disposed in a second axial direction between the first and second recesses;
First and second light emitting modules disposed on opposite sides of the heat discharging body and having a plurality of light emitting diodes;
A first light-transmitting sheet disposed diagonally with respect to an optical axis of the light emitting diode of the first light emitting module within the first recess of the housing and diffusing light emitted from the first light emitting module;
A second light-transmissive sheet disposed diagonally with respect to an optical axis of the light emitting diode of the second light emitting module in a second recess of the housing and diffusing light emitted from the second light emitting module;
A first reflective sheet attached to a surface of an inner surface of the first and second recesses adjacent to the light emitting diode of the first and second light emitting modules and reflecting the first side light emitted from the light emitting diode;
And a second reflective sheet attached to a surface of the inner surface of the first and second recesses between the first reflective sheet and the upper ends of the first and second transparent sheets,
Wherein the heat discharging body includes first and second reflecting portions extending to lower ends of the first and second light transmitting sheets,
And a third reflective sheet having a plurality of reflective surfaces having different radii of curvature on the first and second reflective portions,
And the third reflective sheet comprises a non-reflective sheet. The method according to claim 1,
Wherein the first and second light transmitting sheets include a diffusion sheet,
Wherein the first reflective sheet comprises a positive reflective material. 3. The method of claim 2,
And the second reflective sheet comprises a non-reflective sheet. 4. The method according to any one of claims 1 to 3,
Wherein a boundary portion of the first and second reflective sheets is a peak portion of the first and second recesses. 4. The method according to any one of claims 1 to 3,
Wherein the third reflective sheet is disposed closer to the light emitting diode than the first reflective sheet. 4. The method according to any one of claims 1 to 3,
Wherein the heat dissipator includes first and second heat dissipation units in which the first and second light emitting modules are disposed,
Wherein the first reflecting portion extends from the first heat releasing portion to the lower end of the first light transmitting sheet,
Wherein the second reflective portion extends from the second heat radiation portion to a lower end portion of the second translucent sheet,
Wherein the first and second reflecting portions comprise curved surfaces having a plurality of inflection points. 4. The method according to any one of claims 1 to 3,
Wherein the first and second light transmitting sheets are disposed obliquely with respect to the optical axis of the light emitting diodes of the first and second light emitting modules. 4. The method according to any one of claims 1 to 3,
Wherein the first and second recesses are line-symmetric with respect to the second axial direction. 4. The method according to any one of claims 1 to 3,
Wherein the first reflective sheet includes a plurality of reflective surfaces, and the plurality of reflective surfaces has a radius of curvature gradually increasing from the center of the LED. 4. The method according to any one of claims 1 to 3,
Wherein the third reflective sheet comprises a plurality of reflective surfaces, the plurality of reflective surfaces increasing in size as the radius of curvature is further away from the light emitting diodes. 4. The method according to any one of claims 1 to 3,
And a front cover disposed below the first and second reflective portions of the heat discharging body and supporting under the lower ends of the first and second light transmitting sheets.

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