KR102410453B1 - Lighting apparatus - Google Patents

Abstract

A lighting device according to an 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, the lower portions of the first and second back covers being opened; a heat sink disposed between the first and second recesses in a second axial direction; first and second light emitting modules disposed on opposite sides of the heat sink and having a plurality of light emitting diodes; a first translucent sheet disposed in an oblique shape in the first recess of the housing and diffusing the light irradiated from the first light emitting module; a second translucent sheet disposed in a diagonal shape in the second recess of the housing and diffusing the light irradiated from the second light emitting module; and a front cover coupled under the heat sink and supporting lower ends of the first and second light-transmitting sheets, wherein the front cover includes a fixed frame protruding in the direction of the heat sink and the second cover under the fixed frame. and a cover plate extending toward lower ends of the first and second light-transmitting sheets.

Description

lighting device {LIGHTING APPARATUS}

The embodiment relates to a lighting device.

In general, when lighting devices using LEDs are turned on, high heat is generated. This heat results in a decrease in the lifespan of the lamp and various parts supporting it.

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

An embodiment provides a lighting device for a flat panel.

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

An embodiment provides a lighting device for preventing glare.

An embodiment provides a lighting device that reflects light from both sides of a plurality of light emitting diodes to a translucent sheet.

The embodiment provides a lighting device for uniformly irradiating side light emitted from a light emitting diode on a translucent sheet by specular and random reflection.

The embodiment provides a lighting device having a front cover covering a heat sink to which a light emitting module is coupled to a lower center of a housing.

An embodiment provides a lighting device having a front cover supporting the lower end of the light-transmitting sheet disposed on both sides of the center of the housing.

A lighting device according to an 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, the lower portions of the first and second back covers being opened; a heat sink disposed between the first and second recesses in a second axial direction; first and second light emitting modules disposed on opposite sides of the heat sink and having a plurality of light emitting diodes; a first translucent sheet disposed in an oblique shape in the first recess of the housing and diffusing the light irradiated from the first light emitting module; a second translucent sheet disposed in a diagonal shape in the second recess of the housing and diffusing the light irradiated from the second light emitting module; and a front cover coupled under the heat sink and supporting lower ends of the first and second light-transmitting sheets, wherein the front cover includes a fixed frame protruding in the direction of the heat sink and the second cover under the fixed frame. and a cover plate extending toward lower ends of the first and second light-transmitting sheets.

The embodiment may provide a new lighting device for a flat panel.

The embodiment may improve glare by improving the uniformity of light in the lighting device.

In the embodiment, the side light of the plurality of light emitting diodes is reflected, so that the glare improvement effect in the translucent sheet can be given.

In the embodiment, the front cover is detachably attached to the lower center of the housing to cover the lower end of the heat sink and the both sides of the light-transmitting sheet, so that the exterior design can be changed in various forms.

The embodiment may improve the reliability of the lighting device.

1 is an exploded perspective view of a lighting device according to an embodiment;
FIG. 2 is a combined perspective view of the lighting device of FIG. 1 .
3 is a side cross-sectional view of the lighting device of FIG. 2 .
4 is a partially enlarged view of the lighting device of FIG. 2 .
5 is an exploded perspective view of the heat sink and the front cover of FIG. 1 .
6 is a partial enlarged view of the heat sink and the front cover of FIG. 1 .
7 is a combined perspective view of the heat sink and the front cover of FIG. 5 .
FIG. 8 is an enlarged view of the first back cover of the lighting device of FIG. 3 , and is a view comparing each reflective area in the first recess.
9 is an enlarged view of a first back cover of the lighting device of FIG. 3 .
FIG. 10 is a view showing first and third reflective sheets on the first back cover of FIG. 9 .
11 is a cross-sectional view on the AA side of the lighting device of FIG. 2 .
12 is a side cross-sectional view illustrating coupling of a heat sink and a front cover to a housing according to an embodiment.
13 to 15 are views showing another example of the front cover according to the embodiment.
16 is a side cross-sectional view illustrating a light emitting diode according to an embodiment.

Hereinafter, a preferred embodiment of a lighting module or lighting device having a heat dissipation structure according to an embodiment will be described with reference to the accompanying drawings. The terms to be described later are terms defined in consideration of functions in the present embodiment, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification. In addition, the following examples do not limit the scope of the present invention, but are presented only as examples, and there may be various embodiments implemented through the present technical idea.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. On the other hand, as used herein, the term "lighting module or lighting device" is used as a general term for devices similar to flat lamps, luminaires, street lamps, various lamps, electric signs, and headlamps for indoor or outdoor lighting. make it clear

1 is an exploded perspective view of a lighting device according to an embodiment, FIG. 2 is a combined perspective view of the lighting device of FIG. 1 , FIG. 3 is a side cross-sectional view of the lighting device of FIG. 2 , and FIG. 4 is a part of the lighting device of FIG. 2 It is an enlarged view, FIG. 5 is an exploded perspective view of the heat sink and the front cover of FIG. 1 , FIG. 6 is a partially enlarged view of the heat sink and the front cover of FIG. 1 , and FIG. 7 is a combined perspective view of the heat sink and the front cover of FIG. to be.

1 to 7 , the lighting device 100 includes a housing 110 having back covers 111 and 112 having recesses 115 and 115A with open lower portions, and the back covers 111 and 112 . The heat sink 150 disposed under the center of the heat sink 150, the light emitting modules 170 and 170A disposed on both sides of the heat sink 150, and the light-transmitting sheets 180 and 182 disposed in the recesses 115 and 115A of the back cover 111 and 112 ) is included.

1 to 3 , the housing 110 includes back covers 111 and 112 having recesses 115 and 115A convexly recessed upward at the lower portion. The back covers 111 and 112 may include first and second back covers 111 and 112 symmetrical to each other based on a straight line in the center-side second axis (Z) direction of the housing 110 . The recesses 115 and 115A may have a shape symmetrical to each other based on a straight line in the second axis (Z) direction in 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 elips shapes, a hyperbola, or a hyperbola, but is not limited thereto. The recesses 115 and 115A may be divided into first and second recesses 115 and 115A disposed on both sides of the housing 110 in the center-side second axis Z direction. The first recess 115 may have an open lower portion of the first back cover 111 , and the second recess 115A may have an open lower portion of the second back cover 112 .

A heat dissipation member, for example, the heat sink 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 axis direction (Z). A power supply device (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 sidewalls of the recesses 115 and 115A, and the sidewalls may face each other in 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 to reflect light, but is not limited thereto. The depth of the recesses 115 and 115A may be formed to be deeper toward the center region of each of the back covers 111 and 112 . The first and second recesses 115 and 115A may be different illumination areas.

2 and 3 , when viewed from the lower surface 114 of the housing 110 , the length X1 in the first axis (X) direction and the length Z1 in the second axis (Z) direction are the same. or 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, for example, 49 mm to 59 mm can be a range. By disposing the thickness Y1 of the back covers 111 and 112 to be less than 1/10 of the length in the first axis (X) direction and/or the second axis (Z) direction, a lighting device having a slim thickness is provided. can do. The first axis (X) direction is a transverse direction or a width direction of the housing 110, and the second axis (Z) direction is an axial direction orthogonal to the first axis (X) direction and has a longitudinal direction or a longitudinal direction. can be Also, the third axis (Y) direction may be a height or thickness direction. Here, the size (X1 * Z1) of the lighting device is 550 to 600 mm * 550 to 600 mm, and the thickness or height (Y1) may be in the 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, for example, a ceiling. 1, a plurality of fastening protrusions 90 may protrude from the center-side connection portion 117 of the housing 110, and the fastening protrusions 90 are components such as bosses, screws, It may be a fastening means such as a rivet. A fastening hole into which a fastening means such as a screw is inserted may be disposed in the connection part 117 , but the present invention is not limited thereto. Since the plurality of fastening protrusions 90 are coupled through the heat sink 150 , the flow of the heat sink 150 may be suppressed.

Also, as shown in FIG. 3 , a plurality of fastening holes 105 are disposed in the first and second back covers 111 and 112 of the housing 110 to be fastened to other structures.

The housing 110, for example, the back covers 111 and 112 may include a plastic material, for example, PC (Polycarbonate), PETG (Polyethylene Terephthalate Glycol), PE (polyethylene), PSP (Polystyrene Paper), PP (polypropylene), It may include at least one of polyvinyl chloride (PVC).

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

The heat sink 150 may be made of a metal material, for example, may include at least one of metals such as aluminum, copper, nickel, and silver, but is not limited thereto. The heat sink 150 may include a carbon material, but is not limited thereto.

3 to 6, the heat sink 150 has a predetermined curvature from each of the heat radiation parts 151 and 151A and the heat radiation parts 151 and 151A disposed on opposite sides of the light transmitting sheets 180 and 18. It includes reflective parts 153 and 153A extending in the lower end direction.

The heat dissipation parts 151 and 151A may have flat vertical surfaces and may face the light-transmitting sheets 180 and 182 . The heat dissipation parts 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. may include The first heat dissipation unit 151 and the second heat dissipation unit 151A may be disposed in opposite directions with respect to the heat dissipation body 150 .

Flat surfaces of the first and second heat dissipation parts 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 dissipation body 150 may include a heat dissipation hole 159 in which a region between the heat dissipation units 151 and 151A is opened, and the heat dissipation hole 159 is a second axis in which the light emitting diodes 173 are arranged. It may be formed in the (Z) direction. The heat dissipation hole 159 may have a polygonal or circular cross section, but is not limited thereto.

The heat dissipation body 150 may include an upper frame 159A disposed above the heat dissipation hole 159 and a lower frame 159B disposed below the heat dissipation hole 159 . The upper and lower frames 159A and 159B may be bent and extended from the heat dissipation parts 151 and 151A.

The heat dissipation hole 159 may be disposed between the heat dissipation parts 151 and 151A and the upper/lower frames 159A and 159B. A plurality of protrusion insertion holes 91 are disposed in the upper frame 159A and the lower frame 159B, so that the fastening protrusion 90 of the housing 110 may be inserted. A fastening hole 92 may be disposed in the front cover 155 corresponding to the protrusion insertion hole 91 along the fixing frame 157 as shown in FIG. 6 . Accordingly, it may be fastened to the fastening hole 92 of the front cover 155 through the fastening protrusion 90 using the fastening means 19 on the housing 110 of FIG. 1 .

Light emitting modules 170 and 170A are respectively 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 to be irradiated to the translucent sheets 180 and 182. can This can be defined as direct lighting.

As shown in FIG. 4 , reflection units 153 and 153A may be disposed below the heat dissipation units 151 and 151A. The reflective parts 153 and 153A may extend integrally from the heat dissipation parts 151 and 151A. The reflective parts 153 and 153A may include a plurality of reflective regions whose surfaces have different radii of curvature and reflect incident light. The reflective parts 153 and 153A include first and second reflective parts 153 and 153A extending from the respective heat dissipating parts 151 and 151A.

The first reflecting unit 153 is disposed between the first heat dissipating unit 151 and the front cover 155 , and the second reflecting unit 153A is formed between the second heat dissipating unit 151A and the front cover. (155) is placed between.

The first reflecting part 153 may extend from the first heat dissipating part 151 to the outside of the lower end of the first translucent sheet 180 . The second reflecting part 153A may extend from the second heat dissipating part 151A to the outside of the lower end of the second translucent sheet 182 . The inner surface of the first reflective part 153 may include reflective regions having different radii of curvature, and the inner surface of the second reflective part 153A may include reflective regions having different radii of curvature. The inner surfaces of the first and second reflective parts 153 and 153A may be disposed in the direction of the first and second recesses 115 and 115A.

The reflective parts 153 and 153A are adjacent to the lower portions of the light emitting modules 170 and 170A and transmit side light traveling downward among the light emitted from the light emitting diodes 173 to the transmissive sheets 180 and 182 and the back covers 111 and 112. ) is reflected inside the A third reflective sheet 162 may be disposed or coated with a reflective material on inner surfaces of the reflective parts 153 and 153A, or a metal surface of the heat sink 150 may be exposed. The upper ends of the reflection units 153 and 153A may overlap the light emitting diodes 173 of the light emitting modules 170 and 170A in the vertical direction, thereby effectively reflecting the incident light.

4, 6 and 7 , the heat sink 150 may include reflective frames 154 and 154A on the upper outer side, and the reflective frames 154 and 154A are outside the upper frame 159A. It protrudes and may be bent outwardly from the first and second heat dissipating parts 151 and 151A, for example, in the first and second recess directions. The reflective frames 154 and 154A may vertically overlap the light emitting modules 170 and 170A, and may reflect light emitted from the light emitting diode 173 in an upper direction. The reflective frames 154 and 154A may be in close contact with or adhered to the lower surface ( 117A of FIG. 4 ) of the center side connection part 117 of the housing 110 .

4 to 7 , the front cover 155 may be disposed under the heat sink 150 . The front cover 155 may include a metal material or a non-metal material, and may be coupled to the heat sink 150 . When the front cover 155 is made of a metal material, heat conducted from the heat sink 150 may be radiated to the outside. When the heat sink 150 is made of a non-metal material, for example, a plastic material, the design of the front cover 155 may be variously changed.

The front cover 155 may include a fixing frame 157 disposed under the lower frame 159B of the heat sink 150 and a cover plate 156 disposed under 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 sink 150, and the fastening hole 92 A fastening member (19 of FIG. 1 ) fastened through the heat sink 150 may be fastened to the . Accordingly, the front cover 155 may be fixed to the heat sink 150 , and the heat sink 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 formed in a curved shape or an inclined shape. The cover plate 156 may be formed in a symmetrical shape with respect to a center in the second axis (Z) direction.

4 and 6 , the heat sink 150 includes an anti-protrusion 62 protruding in the front cover direction or downward direction from the end portions 61 of the first and second reflection units 153 and 153A. can do. The ends 61 of the first and second reflecting parts 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 parts 153 and 153A ( A locking groove 158 may be provided in a region between the 61 ) and the cover plate 156 , and lower ends of the light-transmitting sheets 180 and 182 may be disposed in the locking groove 158 , respectively. The prevention protrusion 62 may be disposed to face one side surface of the light-transmitting sheets 180 and 182 , respectively.

1, 4, and 7 , the light emitting modules 170 and 170A may be disposed on the heat sinks 151 and 151A of the heat sink 150 . The light emitting modules 170 and 170A include a first light emitting module 170 disposed on the first heat dissipation unit 151 and a second light emitting module 170A disposed on the second heat dissipation 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 erected in the third axis (Y) direction and disposed to be elongated in the second axis (Z) direction, and the plurality of light emitting diodes 173 are disposed on the circuit board 171 along the second axis. It can be arranged in the (Z) direction. The first and second light emitting modules 170 and 170A may be arranged in opposite directions in a region between the first and second recesses 115 and 115A.

The circuit board 171 may be disposed on the heat sinks 151 and 151A to be elongated in the longitudinal direction (Z-axis direction) of the heat sink 150 . One or a plurality of circuit boards 171 may be disposed on the heat dissipation units 151 and 151A, but the present disclosure is not limited thereto.

The circuit board 171 may be screwed and/or adhered to the heat dissipation units 151 and 151A with an adhesive, but is not limited thereto.

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

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

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

The light emitting diode 173 according to the embodiment may include, for example, a warm white light emitting device and a cool white light emitting device on the circuit board 171 . The warm white light emitting device and the cool white light emitting device are devices that emit white light. Since the warm white light emitting element and the cool white light emitting element each emit a correlated color temperature to emit white light of the mixed light, the Color Rendering Index (CRI), which is close to natural sunlight, is increased. Therefore, it is possible to prevent a place where the color of the real object is distorted, and the user's eye fatigue is reduced.

3 , a first light-transmitting sheet 180 may be disposed in the first recess 115 , and a second light-transmitting sheet 182 may be disposed in the second recess 115A. The upper end of the first light-transmitting sheet 180 is disposed in the locking groove 118 on the locking protrusion 125 of the first recess 115 , and the lower end of the first reflecting part 153 of the heat sink 150 . and the locking groove 158 between the front cover 155 and the front cover 155 . Both ends of the second light-transmitting sheet 182 may be disposed between the locking groove 118 and the locking groove 158 of the locking protrusion 125A. The locking protrusions 125 and 125A may be disposed at predetermined positions on the upper surfaces of the first and second recesses 115 and 115A, for example, adjacent to the centers of the upper surfaces of the first and second recesses 115 and 115A. can be placed. The locking protrusions 125 and 125A protrude from the upper surfaces of the respective back covers 111 and 112 in the direction of the first and second recesses 115 and 115A. The locking protrusions 125 and 125A may be disposed along the second axis (Z) direction from the center of the upper surface of the first and second recesses 115 . The locking protrusions 125 and 125A may be disposed outside the upper ends of the first and second light-transmitting sheets 180 and 182 . The locking protrusions 125 and 125A may be made of the same material as or different from those of the first and second back covers 111 and 112, but are not limited thereto.

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

The light-transmitting sheets 180 and 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 polyethylene terephthalate (PET), 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 that of the diffusion film and diffuses the light that has passed through the diffusion film to prevent sagging.

Since the first recess 115 of the first back cover 111 has the same structure as the second recess, the structure of the second recess will be omitted below, and the description will be based on the first recess. do.

8 and 9 , the light-transmitting sheet 180 may be disposed in an oblique shape with respect to the optical axis X0. Here, the upper end of the light transmitting sheet 180 may be disposed on the locking protrusion 125 , and the lower end 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 locking protrusion 125 .

The light-transmitting sheet 180 may be disposed to be inclined at a predetermined angle θ1 with respect to a horizontal straight line of the center-side lower surface of the housing 110 . The light-transmitting sheet 180 may be disposed in each recess 115 of the back cover 111 in an oblique shape with respect to the optical axis X0. The inclination angle θ1 of the light transmitting sheets 180 and 182 is 45 degrees or less with respect to a horizontal straight line of the lower surface of the housing 110, for example, an angle θ1 in the range of 9 degrees to 13 degrees with respect to the optical axis X0. It may be disposed to be inclined, for example, may be disposed to be inclined in the range of 11 degrees to 12 degrees. When the inclination angle θ1 of the translucent sheet 180 is out of the above range, the distribution of light reflected in the recess 115 may not be uniform, and It is not possible to provide a uniform luminance distribution by

Since the light-transmitting sheet 180 is inclined at the angle θ1 , it may correspond to the light emitting diode 173 in a horizontal direction. The light-transmitting sheet 180 may receive and diffuse the light reflected through the surface of the first recess 115 to be irradiated.

The light emitting surface of the light emitting diode 173 or the rear surface of the circuit board 171 may be disposed at a right angle or in a range of 89 degrees to 91 degrees with respect to the first horizontal axis X. Accordingly, the light emitted from the light emitting diode 173 may be directly irradiated onto the entire area B1 , B2 , and B3 of the light-transmitting sheet 180 . The light-transmitting sheet 180 may directly receive and diffuse the light emitted from the light emitting diode 173 at the inclined angle θ1 . As another example, when the light emitting diode 173 deviates from the angle with respect to the first axis X, the light emitted from the light emitting diode 173 is not irradiated to a portion of the translucent sheet 180 . It is possible to avoid and use the reflected light.

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

The inner surface of the back cover 111 may be divided into a plurality of reflective areas M1 and M2 disposed between the light emitting diode 173 and the upper end of the light-transmitting sheet 180 . The reflective regions M1 and M2 include a first reflective region M1 adjacent to the light emitting diode 173 , and a second reflective region disposed between the first reflective region M1 and an upper end of the translucent sheet 180 . region M2.

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

The first reflective region M1 may reflect the first side light L1 among the light emitted from the light emitting diode 173 to the second reflective region M2 . The second reflective region M2 may reflect the light irradiated from the light emitting diode 173 and the light reflected from the first reflective region M1 to the translucent sheet 180 . The first reflective area 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 reflective region M1 may be a regular reflective region, and the second reflective region M2 may be a region that randomly reflects incident lights L1, L2, and L3. have. The first and second reflective regions M1 and M2 may be disposed above the optical axis X0. Also, the locking 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 a region of a directional angle with respect to the optical axis X0 of the light emitting diode 173 . Both ends of the first reflective region M1 may form an angle R3 in a range of 28 degrees to 33 degrees with respect to the light emitting diode 173 as a starting point P. When the angle R3 between both ends of the first reflective region M1 and the starting point P of the light emitting diode 173 is greater than the above range, the light that is normally reflected from the first reflective region M1 is transmissive. A bright line may be generated by being irradiated to the sheet 180, and when the angle R3 is smaller than the above range, the light regularly reflected from the first reflection area M1 is uniformly transmitted to the second reflection area M2. There is a problem in that the light distribution is not uniform because it is not irradiated. The first reflective region M1 may be arranged in an angular range that allows the incident right side light L1 to be reflected to different regions of the second reflective region M2. Here, the fiducial point P may be the center of the emission 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 from the light emitting diode 173 as the starting point P. Both ends of the second reflective region M2 may form an angle in the range of 21 to 26 degrees from the light emitting diode 173 as the starting point P, and the angle R3 formed by the first reflective region M1 may be smaller than Both ends of the second reflective region M2 are disposed at the angle R4 from the center of the emission surface of the light emitting diode 173 as a starting point P, so that light reflected through the first reflective region M1; The light reflected through the third reflective region M3 and the light emitted from the light emitting diode 173 may be randomly reflected to be irradiated onto the entire area of the translucent sheet 180 . When the second reflective area M2 is larger than the angle R4 , a decrease in luminous intensity may occur, and when 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 may be defined as an optical axis X0. The light transmitting sheet 180 has a first point Px that intersects the optical axis X0, and the first point Px is at least 1/2 of the upper end of the light transmitting sheet 180, for example, 2 It can be the /3 point. In addition, the second point Py may be a 1/3 point from the upper end 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 of less than 10 degrees from the light emitting diode 173 as the starting point P, but is not limited thereto. When the angle R1 is 10 degrees or more, a bright line may be generated by light directly incident on the translucent sheet 180 . The angle R1 may vary depending on the inclination angle of the light-transmitting sheet 180 , but is not limited thereto.

As the starting point P of the light emitting diode 173, the angle R1+R2 formed by both ends of the translucent sheet 180 is the angle formed by the first reflective region M1 or the second reflective region M2 ( R3, R4), for example in the range of 34 degrees to 39 degrees. When the angle (R1+R2) formed by both ends of the translucent sheet 180 is smaller than the above range, the light diffusion effect is reduced and the light uniformity can be reduced. There are problems that can increase.

The reflective part 153 may be a third reflective region M3 , and the third reflective region M3 reflects incident light to the second reflective region M2 and/or the translucent sheet 180 . . As the starting point P of the light emitting diode 173 , an angle R5 formed by both ends of the lower third reflective region M3 is an angle formed by the first reflective region M1 or the second reflective region M1 . It may be greater than (R3,R5). The third reflection area M3 may be a regular reflection area or a random reflection area. The third reflective region M3 reflects the incident light to the second reflective region M2 and the translucent sheet 180 , thereby suppressing generation of bright lines in the transmissive sheet 180 . An area adjacent to the light emitting diode 173 among the third reflective area M3 may cover an area deviating from the directional angle of the light emitting diode 173 to reduce light leakage.

At least one of the reflective regions 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 part 153 . The reflective sheets 160 , 162 , and 165 may include first to third reflective sheets 160 , 165 , and 162 .

A first reflective sheet 160 may be disposed in the first reflective region M1 , and a second reflective sheet 165 may be disposed in the second reflective region M2 . A third reflective sheet 162 may be disposed in the third reflective area M3 . The first reflective sheet 160 may be attached to a surface of a region adjacent to the light emitting diode 173 from the high point of the recess 115 among the inner surfaces of each recess 115 . The second reflective sheet 165 may be attached to a region adjacent to the upper end of the light transmitting sheet 180 from the high point of the recess 115 among the inner surfaces of the respective recesses 115 . That is, a boundary portion between the first and second reflective sheets 1601 and 65 may be a high point portion of the recess 160 .

The third reflective sheet 162 may be disposed closer to the light emitting diode 173 than the first reflective sheet 160 . The first and second reflective sheets 160 and 165 may be disposed to correspond to the translucent sheet 180 . As shown in FIG. 8 , both ends of the first reflective sheet 160 may be disposed in the range of the angle R3 from the center of the emission surface of the light emitting diode 173 as a starting point P, and the second reflective sheet At 165, both ends may be disposed in the range of the angle R4 with the reference point P1 from the center of the emission surface of the light emitting diode 173, and the third reflective sheet 162 has both ends of the light emitting diode ( 173) may be arranged in the range of the angle R5 from the center of the emission surface as the starting point P2.

9 and 10 , the gap G1 between the light-transmitting sheet 180 and the upper surface of the first recess 115 is the locking protrusion ( 125), it becomes narrower. The gap G1 may be a space in which light is mixed on the light-transmitting sheet 180 .

The first reflective sheet 160 may include a material different from that of the second reflective sheet 165 . The first reflection sheet 160 may include a regular reflection sheet or a mirror sheet, and the second reflection sheet 165 may include a diffuse reflection sheet or a white sheet. The first reflective sheet 160 includes Ag or Al material. The second reflective sheet 165 may be a white plastic material, for example, a material such as polycarbonate (PC) or PP (polypropylene), or may include a nano coating layer, or a metal layer or a resin layer on which a pattern is formed.

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

8 to 10 , the first, second, and third reflective sheets 160 , 165 , and 162 may include curved surfaces having a plurality of inflection points, and the curved surfaces may reflect light in a desired light path.

The first and second reflective sheets 160 and 165 may include a material having a light reflectivity of 90% or more, and incident light may be reflected without loss due to this light reflectivity, so that the light extraction effect may 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. The third reflective sheet 162 may be removed when the radiator 150 is made of a specular reflective material, but is not limited thereto.

In the transmissive sheets 180 and 182 , when light reflected from the first and third reflective sheets 160 and 162 is randomly reflected by the second reflective sheet 165 and is incident on different regions B1 , B2 , and B3 , the incident It diffuses and transmits the light. Accordingly, it is possible to prevent the generation of bright lines in the translucent sheet 180 by the direct incident light and the indirectly incident light and prevent glare.

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

The minimum distance between the center of the emission 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, and when this minimum distance is less than the above range, the circuit board 171 is Installation may not be easy, and if it is larger than the above range, leakage of side light may occur.

The minimum distance between the center of the emission surface of the light emitting diode 173 and the translucent sheet 180 may be at least twice the minimum distance between the light emitting diode 173 and the first reflective sheet, for example, in the range of 20 to 23 mm. have. When the minimum distance between the center of the emission surface of the light emitting diode 173 and the light-transmitting sheet 180 is greater than the above range, the slope becomes too large, making it difficult to uniformly control the light distribution. Bright lines may be generated.

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

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 include a plurality of reflective surfaces having different radii of curvature. The reflective surface of the third reflective sheet 162 may gradually increase as the radius of curvature increases further 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 translucent sheet 180 to reflect incident light to the second reflective sheet 165 and the translucent sheet 180 . Therefore, it is possible to uniformly irradiate the translucent sheet 180 to suppress the generation of bright lines due to the directly irradiated light.

The first and third reflective sheets 160 and 165 irradiate light to the center area B2 of the light-transmitting sheet 180 , and the center area B2 may receive the main light directly irradiated from the light emitting diode 173 . The bright line caused by the light may be reduced by the indirectly incident light.

The second reflective sheet 165 according to the embodiment randomly reflects the light incident from the first reflective sheet 160 and the light emitting diode 173 to uniformly irradiate the center region B2 of the translucent sheet 180 . Therefore, it is possible to suppress the generation of bright lines due to the light directly incident on the translucent sheet 180 from the light emitting diode 173 . In addition, the light reflected by the third reflective sheet 162 is randomly reflected by the second reflective sheet 165 or is irradiated to the upper regions B1 and B2 of the translucent sheet 180 from the light emitting diode 173 . A bright line caused by light directly incident on the translucent sheet 180 may be removed.

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

Looking at the UGR (Unified glare rating) of the lighting device of the present invention, it has 19 or less, indicating that there is no unpleasant glare to the user. According to the CIE regulations, when the discomfort index (UGR) is 21 or higher, users feel discomfort.

Table 1 shows the UGR, light efficiency, and light uniformity of the lighting device according to the embodiment.

UGR light efficiency uniformity Endwise (horizontal) Crosswise 18.2 19.0 85.1% 82.2%

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

6 and 12 , a stepped structure 53 may be formed on the outer side of the upper surface of the cover plate 156 of the front cover 155 , and the stepped structure 53 includes the light-transmitting sheets 180 and 182 . ) and the anti-protrusion 62 protruding on the end 61 of each of the reflective parts 153 and 153 of the heat sink 150 to prevent the propagation of light transmitted through one side of the light-transmitting sheet 180 and 182 can be blocked

1 and 11 , in the center region of the housing 110 , a plurality of fastening members 90 may be arranged to be spaced apart from each other at a predetermined interval, and intervals K1 and K2 between the plurality of fastening members 90 . The center-side spacing K1 may be narrower or wider than the side-side spacing K2, but is not limited thereto. The front cover 155 may be fixed together with the heat sink 150 to the housing 110 by the fastening member 90 .

13 to 15 are other examples of a front cover according to an embodiment.

Referring to FIG. 13 , the front cover 150 includes a fixing frame 157 and cover plates 156 extending in both directions under the fixing frame 157 .

The fixing frame 157 has a fastening hole and may be fastened to the housing 110 together with the heat sink 150 of FIG. 12 by a fastening means 19 . A space 157A in which a lower portion of the fastening means is disposed in the fixing frame 157 may be provided.

The upper surface 70 of the cover plate 156 may have an inclined surface, and the lower surface may provide a plurality of concave-convex structures 71 and 72 . The inclined upper surface 70 may extend from the center of the cover plate 156 toward the outside to contact below the lower ends of the light-transmitting sheets 180 and 182 of FIG. 12 . That is, the inclined angle of the upper surface 70 of the cover plate 156 may be the same as the inclined angle θ1 of the light transmitting sheet 180 of FIG. 9 . As another example, the outer portion of the stepped structure 70A among the upper surface 70 of the cover plate 156 is disposed at the same angle as the inclination angle θ1 of the light transmitting sheet 180, and the stepped structure 70A ) may be disposed at an angle different from the inclined angle θ1 of the light transmitting sheet 180, for example, smaller or larger than the angle θ1.

The lower portion of the cover plate 156 may include a flat inner region C1 and an outer region C2 having uneven structures 71 and 72 . The flat inner region C1 may be provided as a flat surface to secure the center side rigidity of the front cover 150 . The flat inner region C1 may be a region overlapping the region of the fixing frame 157 in a vertical direction.

A stepped structure 70A is provided on the outer side of the upper surface 70 of the cover plate 156 of the front cover 155, and the stepped structure 70A is a reflective portion of the heat sink 150 shown in FIG. 12 . Corresponding to the prevention protrusions 62 of 153 and 153A, it is possible to reduce the problem of light leakage due to the translucent sheets 180 and 182 .

The outer region C2 having the concave-convex structures 71 and 72 is disposed outside the flat inner region C1 and is a region that does not overlap the fixing frame 157 in the vertical direction, as shown in FIG. It may be a region overlapping the recesses 115 and 115A in a vertical direction. The outer region C2 may gradually thicken from the center of the cover plate 156 toward the outside.

In the concave-convex structures 71 and 72 , concave portions 71 and convex portions 72 may be alternately arranged. In the concave-convex structures 71 and 72 , the depth of the concave portion 71 may gradually increase in the outer direction, and the length of the convex portion 72 may gradually increase in the outer direction. When the front cover 155 includes the concave-convex structures 71 and 72 at the lower portion and is formed of a metal material, a heat dissipation surface area may be increased. The concave portion 71 and the convex portion 72 may be disposed to have the same length as the front cover 155 in the second axis (Z) direction, but is not limited thereto.

Referring to FIG. 14 , the front cover 155 includes a fixing frame 157 and a cover plate 156 extending in opposite directions under the fixing frame 157 .

The cover plate 156 has a concave portion 73 that is depressed upward or toward the heat sink (150 in FIG. 12 ) as the inner portion 74 moves toward the center, and the outer angle θ2 may be disposed at an obtuse angle. . The outer portion 75 of the cover plate 156 is bent from the inner portion 74 and may include a stepped structure 75A. The outer part 75 may be bent in the direction of the lower surface of the lower ends of the light-transmitting sheets 180 and 182 shown in FIG. 12 .

The outer portion 75 of the cover plate 156 provides a stepped structure 75A. The step structure 75A may correspond to the prevention protrusions 62 of the reflection parts 153 and 153A of the heat sink 150 of FIG. 12, and facilitate the insertion of the light-transmitting sheets 180 and 182, and reduce the light leakage problem. can be prevented

Referring to FIG. 15 , the front cover 155 includes a fixing frame 157 and a cover plate 156 disposed under the fixing frame 157 .

Two frames 78 and 79 may be arranged in parallel to the fixed frame 157 to have a predetermined space and to be spaced apart from each other. A fastening means may be fastened to the spaced apart space 77 .

As another example, the fixing frame 157 may include locking ribs 78A and 79A bent outward from the frames 78 and 79, and the locking ribs 78A and 79A are shown in FIG. 12 . , may be coupled to the lower frame 159B of the heat sink 150 .

As another example, the fixing frame 157 may have a hook structure and be coupled to the heat sink 150 of FIG. 12 . As another example, the heat sink 150 of FIG. 12 may have a hook structure, and may be coupled to the housing 110 through the hook structure.

<Light emitting device package>

16 is a side cross-sectional view illustrating a light emitting diode according to an embodiment.

Referring to FIG. 16 , the light emitting diode 200 includes a body 210 , first and second lead electrodes 211 and 212 at least partially disposed on the body 210 , and the body 210 . ) on the light emitting device 101 electrically connected to the first lead electrode 211 and the second lead electrode 212 , and a molding member covering 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 therein and an inclined surface therearound when viewed from above.

The first lead electrode 211 and the second lead electrode 212 may be electrically isolated from each other and formed to penetrate the inside of the body 210 . That is, a part of the first lead electrode 211 and the second lead electrode 212 may be disposed inside the cavity, and the other part 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, It may also function to discharge the heat generated by the light emitting device 101 to the outside.

The light emitting device 101 may be installed 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 of 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 either the first lead electrode 211 or the second lead electrode 212, but is not limited thereto.

The molding member 220 may surround the light emitting device 101 to protect the light emitting device 101 . In addition, the molding member 220 includes a phosphor, and the wavelength of 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 emitting surface, and the center of the upper surface of the molding member 220 may be a center or a starting point of the light emitting surface.

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 including a phosphor on an upper portion of a blue light emitting chip. Here, the phosphor may include at least one of a garnet-based (YAG, TAG), a silicate, a nitride, and an oxynitride-based phosphor.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiment has been described above, it is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100: lighting device 110: housing
111,112: back cover 115,115A: recess
125, 125A: locking projection 150: heat sink
155: front cover 160: first reflective sheet
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 (15)

a housing having first and second back covers on both sides of the center;
first and second recesses having an open lower portion and concave in each of the first and second back covers, the first and second recesses being spaced apart from each other in a first axial direction;
a heat sink disposed between the first and second recesses in a second axial direction orthogonal to the first axial direction;
first and second light emitting modules respectively disposed on one side and the other side of the heat sink and having a plurality of light emitting diodes;
a first translucent sheet for diffusing the light irradiated from the first light emitting module in the first recess of the housing;
a second translucent sheet for diffusing the light irradiated from the second light emitting module in the second recess of the housing; and
and a front cover coupled under the heat sink and supporting the lower ends of the first and second light-transmitting sheets;
The upper end of the first light-transmitting sheet is disposed higher than the optical axis of the light emitting diode of the first light emitting module,
The upper end of the second light-transmitting sheet is disposed higher than the optical axis of the light emitting diode of the second light emitting module,
The front cover includes a fixing frame protruding toward the heat sink, and a cover plate extending toward lower ends of each of the first and second light-transmitting sheets under the fixing frame. According to claim 1,
The heat sink is disposed under the center of the first and second back covers, and the first and second heat sinks on which the first and second light emitting modules are disposed on both sides, and the first heat sink from the first heat sink A first reflective portion extending to an outer upper surface of the light transmitting sheet, a second reflecting portion extending from the second heat dissipating portion to an outer upper surface of the second light transmitting sheet, and the front cover from outer ends of the first and second reflecting units and an anti-protrusion protruding toward the cover plate and facing one side of the first and second light-transmitting sheets,
Each of the first and second recesses has a parabolic shape. 3. The method of claim 2,
The cover plate of the front cover includes a curved or inclined shape,
The fixed frame may include a plurality of fixed frames spaced apart from each other; and a fixing rib having an upper portion of each of the fixing frames bent outward. 4. The method according to any one of claims 1 to 3,
The cover plate of the front cover includes a flat inner region under the fixing frame and an outer region having a concave-convex structure on an outer lower portion of the inner region. 4. The method according to any one of claims 1 to 3,
The cover plate of the front cover has a concave portion convex toward the heat sink toward the inner center,
The front cover is a lighting device comprising a plastic material.
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