KR20170096734A - Optical lens, light unit and lighting apparatus having thereof - Google Patents

Abstract

According to one embodiment of the present invention, an optical lens comprises: first and second bottom surfaces spaced apart from each other having a length longer in a second axial direction than a first axial direction on a lower portion of a transparent body; a recess disposed between the first and second bottom surfaces having a longer depth in the second axial direction; a plurality of incident surfaces having a first incident surface on an upper surface of the recess and second and third incident surfaces corresponding to each other on opposite sides of the recess; a first total reflection plane and a second total reflection plane disposed on opposite sides of the body; and a first exit surface on an upper center of the body, and second and third exit surfaces on the opposite side of the first exit surface. Accordingly, the present invention is able to reduce noises, such as a hot spot, caused by light irradiated from an optical lens.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical lens, a light unit having the same,

The present invention relates to an optical lens.

The present invention relates to a light unit having an optical lens and a lighting apparatus.

BACKGROUND ART A light emitting device, for example, a light emitting device (Light Emitting Device) is a type of semiconductor device that converts electrical energy into light, and has been widely recognized as a next generation light source in place of existing fluorescent lamps and incandescent lamps.

Since the light emitting diode generates light by using a semiconductor element, the light emitting diode consumes very low power as compared with an incandescent lamp that generates light by heating tungsten, or a fluorescent lamp that generates ultraviolet light by impinging ultraviolet rays generated through high-pressure discharge on a phosphor .

In addition, since the light emitting diode generates light using the potential gap of the semiconductor device, it has a longer lifetime, faster response characteristics, and an environment-friendly characteristic as compared with the conventional light source.

Accordingly, much research has been conducted to replace an existing light source with a light emitting diode, and a light emitting diode has been increasingly used as a light source for various lamps, display devices, display boards, street lamps and the like used in indoor and outdoor.

The embodiment provides a new optical lens.

The embodiment provides an optical lens having a long bar shape.

Embodiments provide an optical lens having at least three different incidence planes and at least three different emergence planes.

The embodiment provides a light unit having an optical lens having a bar shape on a plurality of light emitting elements.

An embodiment provides a light unit having a plurality of light emitting elements arranged in a recess of an optical lens.

Embodiments provide a light unit capable of allowing light emitted from the upper surface and side surfaces of a light emitting element to enter an incident surface of an optical lens.

The embodiment provides a light unit having an optical lens having a long length in the longitudinal direction of a circuit board on which a light emitting element is disposed.

The embodiment provides a light unit in which each of the plurality of light emitting elements has a plurality of light emitting chips and arranged in the longitudinal direction of the optical lens.

Embodiments can provide a light unit capable of reflecting light emitted to both sides of a packaged plurality of light emitting chips by arranging reflective sidewalls on side walls of a plurality of light emitting devices.

The embodiment provides a light unit in which a plurality of optical lenses are disposed on one circuit board.

There is provided a lighting apparatus including a light unit and an illumination device having an optical lens and a light emitting element according to an embodiment.

An optical lens according to an embodiment includes first and second bottom surfaces at a lower portion of a transparent body and spaced apart from each other and having a longer length in a second axial direction than a first axial direction; A recess disposed between the first and second bottom surfaces and having a length in a second axial direction; A plurality of incident surfaces having a first incident surface on the upper surface of the recess, a second incident surface and a third incident surface corresponding to both sides of the recess; A first total reflection plane and a second total reflection plane disposed on opposite sides of the body; And a first exit surface on an upper center of the body, and second and third exit surfaces on both sides of the first exit surface.

A light unit or an illumination device having an optical lens according to an embodiment.

The embodiment can reduce noise such as hot spot caused by light emitted from the optical lens.

The embodiment can improve the light uniformity in the light unit.

The embodiment can improve the incidence efficiency of the optical lens by the light emitting element having the reflecting sidewalls.

The embodiment can improve the uniformity of light in the side view type light unit.

The embodiment can improve the reliability of a light unit having an optical lens and a lighting apparatus having the same.

1 is a perspective view showing an optical lens according to the first embodiment.
2 is a side sectional view of the optical lens of Fig.
3 is a side sectional view for explaining an incident surface and an emission surface with reference to the bottom center of the recess of the optical lens of Fig.
Fig. 4 is a perspective view showing a light unit having the optical lens of Fig. 1;
Fig. 5 is a perspective view showing another example of the light unit having the optical lens of Fig. 1;
6 is a side sectional view of the light unit of Fig.
7 is a perspective view showing a light emitting element of a light unit according to the embodiment.
8 is a cross-sectional view of the light-emitting device of Fig. 7 on the AA side.
9 is a cross-sectional view of the light-emitting device of Fig. 7 on the BB side.
10 is a first modification of the light emitting element in the light unit according to the embodiment.
11 is a cross-sectional side view of the light emitting device of Fig. 10 on the CC side.
12 is a DD side sectional view of the light emitting device of Fig.
13 is a view showing a first modification of the optical lens in the light unit according to the first embodiment.
14 is a view showing a second modification of the optical lens in the light unit according to the first embodiment.
15 is a view showing a third modification of the optical lens in the light unit according to the first embodiment.
16 is a perspective view of a light unit having an optical lens according to the second embodiment.
17 is a side cross-sectional view of the optical lens of Fig.
Fig. 18 is a view for explaining the optical lens of Fig. 16;
19 is a view showing a first modification of the optical lens of Fig.
20 is a view showing a second modification of the optical lens of Fig.
21 is a view showing a third modification of the optical lens of Fig.
22 is a perspective view of a light unit according to the third embodiment.
23 is a view showing an optical lens of the light unit of Fig.
24 is a cross-sectional side view of the light unit of Fig. 22 on the engagement side;
Fig. 25 is a view showing support protrusions of the optical lens in the light unit of Fig. 22;
26 is a view showing an example of the outer side wall of the optical lens according to the embodiment.
27 to 29 are views showing a modification of the support projection of the optical lens according to the embodiment.
30 is a view showing a lighting device having an optical lens according to an embodiment.
31 is a detailed configuration diagram of a light emitting device according to the embodiment.
32 is another detailed configuration diagram of the light emitting device according to the embodiment.
33 (a) and 33 (b) are views showing the light-directed angular distribution of the optical lens according to the embodiment.
34 (a) and 34 (b) are diagrams comparing light-directed angular distributions of a light-emitting device according to an embodiment and a light-emitting device having reflective sidewalls.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the description of the embodiments, it is to be understood that each layer (film), area, pattern or structure may be referred to as being "on" or "under / under" Quot; on "and" under "as used herein are intended to refer to all that is" directly "or" indirectly " . In addition, the criteria for the top / bottom or bottom / bottom of each layer are described with reference to the drawings.

Hereinafter, an optical lens and a light unit having the same according to an embodiment will be described with reference to the accompanying drawings.

1 is a perspective view showing the optical lens according to the first embodiment, Fig. 2 is a side sectional view of the optical lens shown in Fig. 1, Fig. 3 is a plan view of the optical lens shown in Fig. Fig. 4 is a perspective view showing a light unit having the optical lens of Fig. 1; Fig.

1 to 4, the optical lens 300 according to the embodiment is a transparent body and has a length Y1 in the direction of the second axis Y is larger than a width X1 in the direction of the first axis X Can be arranged largely. The length Y1 of the optical lens 300 may be set to be three times or more, for example, four times or more, or four times to six times the width X1. If the length Y1 of the optical lens 300 exceeds the above range, the optical lens 300 may be bent. If the length is smaller than the above range, Can be increased. The direction of the first axis X may be the width direction of the optical lens 300 and the direction of the second axis Y may be the length direction of the optical lens 300. [ The length Y1 of the optical lens 300 may range from 60 mm or more, for example, 65 mm to 75 mm.

The thickness Z1 of the optical lens 300 according to the embodiment may be set to be less than the width X1 of the optical lens 300 and not more than 1 / 2.5 of the width X1 of the optical lens 300, 2.5 to 1 / 1.8. If the thickness Z1 of the optical lens 300 is smaller than the above range, the light extraction efficiency may be deteriorated. If the thickness Z1 is larger than the above range, the efficiency of light may be deteriorated. The optical lens 300 according to the embodiment can reduce the number of lenses and improve the luminance of the illumination light and the light uniformity.

2 and 3, the optical lens 300 includes a plurality of bottom surfaces 302 and 304 arranged in the longitudinal direction, a recess 315 concaved and recessed between the plurality of bottom surfaces 302 and 304, A plurality of incidence planes 310, 312 and 314 disposed on the recess 315, a plurality of total reflection planes 332 and 334 disposed outside the second and third incident planes 312 and 314 of the plurality of incidence planes 310, 342, and 344 that emit light incident on the incident surfaces 310, 312, and 314 and the plurality of incident surfaces 310, 312, and 314 disposed on the total reflection surfaces 332 and 334, respectively.

The plurality of bottom surfaces 302 and 304 of the optical lens 300 are a bottom surface of the body and include first and second bottom surfaces 302 and 304. The first and second bottom surfaces 302 and 304 are formed in the recess 315, As shown in FIG. Here, the recess 315 may be recessed between the first and second bottom surfaces 302 and 304 in a light emitting direction.

The first bottom surface 302 may be arranged to overlap the first exit surface 340 and the second exit surface 342 in a vertical direction to support a part of the bottom surface of the optical lens 300. The first bottom surface 302 may not overlap vertically with respect to the first total reflection surface 332 or may be disposed further inward.

The second bottom surface 304 may be vertically overlapped with the first exit surface 340 and the fourth exit surface 344 to support a bottom portion of the optical lens 300. The second bottom surface 304 may not overlap vertically with respect to the second total reflection surface 334 or may be disposed further inside.

The first and second bottom surfaces 302 and 304 may be long in the longitudinal direction and disposed parallel to each other at the bottom center ZO of the recess 315. The width X3 of each of the first and second bottom surfaces 302 and 304 may be less than or equal to 2 mm and may range, for example, from 1.5 mm to 2 mm. The width X3 of the first and second bottom surfaces 302 and 304 is a width on the horizontal axis X0 with respect to the bottom center Z0 of the recess 315. When the width is narrower than the above range, There is a problem that the width X1 of the optical lens 300 becomes too large.

The first and second bottom surfaces 302 and 304 may be flat surfaces and may be irregular surfaces or support protrusions may be protruded as described below. The bottom surfaces 302 and 304 according to embodiments may be further extended by outwardly extending bottoms as described below, but are not limited thereto.

The length of the recess 315 may be long in the second axial direction, i.e., the longitudinal direction. The length of the recess 315 may be the same as the length Y1 of the optical lens 300. [ The length of the recess 315 may be smaller than the length Y1 of the optical lens 300. In this case, another incidence surface or another total reflection surface may be disposed outside the optical lens 300 in the longitudinal direction have. The recess 315 may have a structure in which the bottom (or down) direction of the optical lens 300 and the second axis Y direction are open.

The recess 315 may be disposed at a predetermined depth D4 and a predetermined width from the bottom center ZO. The recess 315 may have a shape in which the upper width D3 is narrower than the bottom width D2. The difference between the upper width D3 and the lower width D2 may be a difference of 0.8 mm or more, for example, in a range of 0.8 mm to 1.2 mm Lt; / RTI > If the difference between the top width D3 of the recess 315 and the bottom width D2 is larger or smaller than the above range, the incident distribution of light may be varied. The bottom width D2 of the recess 315 may be in the range of 3 mm or more, for example, 3 mm to 4 mm, and the top width D3 of the recess 315 may be in the range of 2 mm to 2.8 mm. The bottom width D2 of the recess 315 may be wider than the width of the light emitting device described later. The upper width D3 of the recess 315 may be wider than the width of the light emitting device described later. Since the recess 315 is long in the longitudinal direction, a plurality of light emitting elements can be disposed inside the recess 315, thereby maximizing the light incidence efficiency.

The plurality of incidence planes 310, 312, and 314 may be disposed on the upper surface and both sides of the recess 315, The plurality of incident surfaces 310, 312 and 314 includes a first incident surface 310 which is the upper surface of the recess 315 and second and third incident surfaces 312 and 314 which are both sides of the recess 315. The first incident surface 310 may be curved and may include a curved surface that protrudes toward the bottom of the recess 315, for example. The first incident surface 310 may include a curved surface having a predetermined radius of curvature. Since the first incident surface 310 is provided as a curved surface with a downward convex shape, the incident light can be refracted to the first exit surface 340.

The second incident surface 312 may be disposed between the first incident surface 310 and the first bottom surface 302 and the third incident surface 314 may be disposed between the first incident surface 310 and the first bottom surface 302, And the second bottom surface (304). The second incident surface 312 may be a convex curved surface protruding in the direction of the recess 315 or a flat inclined surface. The third incident surface 314 may be a convex curved surface protruding in the direction of the recess 315 or may be arranged in a flat inclined surface.

The plurality of exit surfaces 340, 342, and 344 are disposed on the body. The plurality of exit surfaces 340, 342, and 344 are convex first exit surface 340 on the body center side, and second and third exit surfaces 340 and 342 inclined to both sides of the first exit surface 340 342, 344). The plurality of exit surfaces 340, 342, and 3444 may include a first exit surface 340 for refracting incident light to the first incident surface 310 and a second exit surface 340 for reflecting light incident through the second incident surface 312 A second exit surface 342 for refracting and emitting light, and a third exit surface 344 for refracting the light incident through the third incident surface 314 and emitting the light. The first exit surface 310 may overlap the first incident surface 310, the second and third incident surfaces 312 and 314 in the vertical direction.

The plurality of total reflection surfaces 332 and 334 are both side surfaces of the body and are disposed on both sides in the longitudinal direction of the optical lens 300 to change the path of the incident light from the side direction to the emission direction. The plurality of total reflection surfaces 332 and 334 include first and second total reflection surfaces 332 and 334 and the first total reflection surface 332 is disposed between the first bottom surface 302 and the second outgoing surface, The second total reflection surface 334 is disposed between the second bottom surface 304 and the third emission surface 344.

The first total reflection surface 332 has an outwardly convex curved surface and reflects the light incident on the second incident surface 312 to the second exit surface 342. The second total reflection surface 334 has an outwardly convex curved surface and reflects the light incident on the third incident surface 314 to the third emission surface 344. [ Each of the first and second total reflection surfaces 332 and 334 may include curved surfaces having different radii of curvature.

Referring to FIG. 2, the first exit surface 340 of the optical lens 300 may include a curved surface disposed in the center area and convex in the direction of the central axis Y0. The first exit surface 340 may have a convex curved surface in a direction opposite to the protruding direction of the curved surface of the first incident surface 310. The first exit surface 340 may have a curved surface having a curvature radius smaller than a curvature radius of the first incident surface 310. The width X2 of the first exit surface 340 may be in a range of two times or more, for example, two times to three times the width D3 of the first incident surface 310. [ When the width X2 of the first exit surface 340 is smaller than the above range, the amount of light incident on the first exit surface 340 through the first incident surface 310 is reduced, When the width X2 of the first exit surface 340 is larger than the above range, the improvement of the exit efficiency is insignificant and the width X3 of the second and third exit surfaces 342 and 344 ) May be different.

The width X2 of the first exit surface 340 may be greater than the width X3 of the second and third exit surfaces 342 and 344. [ The width X2 of the first exit surface 340 may be more than 1 times and not more than 3 times the width X3 of the second and third exit surfaces 342 and 344. [ The ratio of the width (X3) of the second or third emitting surface to the width (X2) of the first emitting surface (340) may be in the range of 1: 1.1 to 1: 1.5. The width X2 of the first exit surface 340 may range from 5 mm or more to 5.5 mm to 6.5 mm and the width X3 of the second and third exit surfaces 342 and 344 may be 5.4 mm or less, And may have a range of 4 mm to 5.4 mm. If the width X2 of the first exit surface 340 is smaller than the above range, the center-side emission efficiency may be lowered. If the width X2 is larger than the above range, the side-side emission efficiency may be lowered.

The first through third exit surfaces 340, 342, and 344 may have the same length as the length Y1 of the optical lens 300. [ Since the first to third emitting surfaces 340, 342 and 344 are arranged to have the same length as the recess 315, refraction is performed on the light incident through the first to third incident surfaces 310, 312 and 314, can do. As another example, the first exit surface 340 may have a length equal to the length Y1 of the optical lens 300, and the second and third exit surfaces 342 and 344 may have a length equal to the length Y1 of the optical lens 300 And may have a length shorter than the length Y1. It is possible that the area adjacent to the first and second total reflection surfaces 332 and 334 of the both side walls 346 and 348 of the optical lens 300 is disposed in a sloping plane. Both sidewalls 346 and 348 of the optical lens 300 may be formed in a vertical plane or a sloped area in a region adjacent to the first and second exit surfaces 342 and 344.

As shown in FIG. 2, the first exit surface 340 may have a gradually higher height toward the center from a boundary point (P1 and P2 in FIG. 3) between the first exit surface 340 and the second and third exit surfaces 342 and 344, The height Z2 may have a height of, for example, 1 mm or more, and may have a range of 1.2 mm to 2 mm, for example. The maximum height Z2 of the first exit surface 340 may vary depending on the radius of curvature of the first exit surface 340 or the width X2. Since the first exit surface 340 has the height Z2 and the width X2 and is disposed on the first incident surface 310, the light incident through the first incident surface 310 is refracted .

The maximum height or thickness D5 of the second and third emission surfaces 340 may be smaller than the thickness Z1 of the optical lens 300. [ The outer edge points P3 and P4 of the second and third exit surfaces 340 may be lower than the height of the first exit surface 340, for example. Since the second and third emitting surfaces 340 provide inclined surfaces, the light reflected through the first and second total reflection surfaces 332 and 334 can be refracted.

3, the optical lens 300 includes a first angle? 1 formed by both edges 11 and 12 of the first incident surface 310 with respect to a bottom center ZO of the recess 315 R1) may have a range of 60 degrees or more, for example, 60 degrees to 75 degrees. The first angle R1 formed by the first incident surface 310 from the bottom center ZO of the recess 315 may vary depending on the directivity angle of the light emitting device.

The first angle R1 may be greater than a second angle R2 formed by the first exit surface 340 with respect to the bottom center ZO of the recess 315. [ The difference between the first angle R1 and the second angle R2 may have a difference of 10 degrees or more, for example, 15 degrees to 25 degrees. If the difference between the first and second angles R1 and R2 is smaller than or larger than the above range, the thickness of the optical lens 300 may be influenced or the optical efficiency may be changed. The extraction efficiency of light emitted to the center region of the optical lens 300 can be improved by the first and second angles R1 and R2.

The third angle R3 between both edges P3 and P4 of the second and third emission surfaces 342 and 344 to the bottom center ZO of the recess 315 is 90 degrees or more, Lt; / RTI > The third angle R3 may divide the areas of the second and third emitting surfaces 342 and 344 and the first and second total reflection surfaces 332 and 334 to improve light extraction efficiency in the side area .

The second and third emitting surfaces 342 and 344 may have an angle tilted with respect to a horizontal straight line and may have an angle? 1 in the range of, for example, 95 degrees to 103 degrees, for example, greater than 90 degrees with respect to a vertical axis . The angle? 2 between the first and second total reflection surfaces 332 and 334 with respect to the straight line connecting the both edges P3-15 and P4-16 with respect to the vertical axis is not more than 50 degrees, Lt; / RTI > The first and second total reflection surfaces 332 and 334 may have curved surfaces protruding outwardly from a straight line connecting both edges P3-15 and P4-16. The straight line connecting the both edges (straight line P3-15, straight line P4-16) of the first and second total reflection surfaces 332 and 334 provides inclined surfaces with respect to the vertical axis so that the second and third incident surfaces 312 and 314 May be reflected by the second and third emission surfaces 342 and 344.

The optical lens 300 may include a light-transmitting material. The optical lens 300 may include at least one of polycarbonate (PC), polymethyl methacrylate (PMMA), silicon or epoxy resin, or glass. The optical lens 300 may have a refractive index of 2 or less and may include a transparent material in a range of 1.4 to 1.7, for example.

4, in the light unit 401 according to the embodiment, the circuit board 400 and the light emitting device 100 may be disposed under the optical lens 300. The light emitting module may include the light emitting device 100 and the circuit board 400 and the light unit 401 may include the optical lens 300, the circuit board 400, and the light emitting device 100.

A plurality of the light emitting devices 100 may be disposed on the circuit board 400 in the length direction Y1 of the optical lens 300. [ The plurality of light emitting devices 100 may be arranged along the optical lens 300 at a predetermined interval. The light emitting device 100 may be disposed in the recess 315 of the optical lens 300.

The circuit board 400 may connect the plurality of light emitting devices 100 to each other, for example, in series, parallel, or series-parallel. The circuit board 400 may include a layer disposed below the optical lens 300 and absorbing or reflecting the light leaked from the optical lens 300.

Referring to FIG. 6, the width of the circuit board 400 may be wider than the bottom width D2 of the recess 315, and may be 5 mm or more. The circuit board 400 may be in contact with the first and second bottom surfaces 302 and 304 of the optical lens 300.

The length of the circuit board 400 is longer than the length of the optical lens 300 (Y1 in FIG. 1), and the light leaked from the optical lens 300 can be absorbed or reflected. One or a plurality of optical lenses 300 may be disposed on the circuit board 400. For example, as shown in FIG. 5, a plurality of optical lenses 300 may be arranged in a longitudinal direction on a single circuit board 400. Since the length of the optical lens 300 (Y1 in FIG. 1) may be bent when molded to 80 mm or more, the plurality of optical lenses 300 may be disposed on one circuit board 400 .

The circuit board 400 may include at least one of a resin-made PCB, a metal core PCB (MCPCB) having a metal core, and a flexible PCB (FPCB), but the present invention is not limited thereto. The light emitting device 100 may emit at least one or more than two of white, blue, green, red, yellow, and ultraviolet light, but the present invention is not limited thereto.

The light emitting device 100 may be disposed in the recess 315 of the optical lens 300. The light emitting device 100 may be disposed adjacent to the first incident surface 310 and the second and third incident surfaces 312 and 314 of the recess 315. The lower surface of the light emitting device 100 may be disposed above the bottom surfaces 302 and 304 of the optical lens 300. The lower surface of the light emitting device 100 may be disposed above the upper surface of the circuit board 400. The lower surface of the light emitting device 100 may be disposed above the upper surface of the circuit board 400. The light emitted from the light emitting device 100 is incident on the first incident surface 310 of the optical lens 300 and the second incident surface 310 of the optical lens 300, May be incident through the surfaces 312 and 314. Thus, the loss due to the light emitted from the light emitting device 100 can be reduced.

The first exit surface 340 of the optical lens 300 emits the first light L1 incident on the first incident surface 310 within a range of 0 degrees ± 45 degrees with respect to the center axis Y0 do. The first exit surface 340 may refract the first light L1 so that the first exit surface 340 does not deviate from the first exit surface 340.

The second and third emitting surfaces 342 and 344 of the optical lens 300 are arranged at an angle of +45 degrees to +90 degrees with respect to an axis perpendicular to the second light L2 incident on the second and third incident surfaces 312 and 314, And is emitted within a range of -45 degrees to -90 degrees. The second and third emission surfaces 342 and 344 may refract the emitted second light L2 so as not to deviate from the second and third emission surfaces 342 and 344.

The directivity angle distribution of the light emitted from the optical lens 300 according to the embodiment can be found in a range of 20 degrees or less, for example, 13 degrees to 20 degrees, with respect to the central axis as shown in FIG.

7 to 12, a light emitting device according to an embodiment will be described.

Referring to FIG. 7, the light emitting device 100 includes a device having a length C1 longer than a width C2. For example, the length C1 may be twice or more the width C2. The width C2 of the light emitting device 100 may be 500 탆 or more, for example, 600 탆 or more, the length C1 may be 1000 탆 or more, e.g., 1200 탆 or more, and the thickness C3 may be 200 탆 or more.

Referring to FIGS. 7 to 9, the light emitting device 100 according to the embodiment may include the light emitting chips 151 and 152. Each of the light emitting devices 100 may include two or more light emitting chips 151 and 152. The two or more light emitting chips 151 and 152 may be disposed in the longitudinal direction of the optical lens 300. The two or more light emitting chips 151 and 162 may be spaced apart from each other. The light emitting device 100 according to the embodiment includes the first and second light emitting chips 151 and 152 and the first and second light emitting chips 151 and 152 are disposed with a long length in the longitudinal direction of the optical lens 300 .

The light emitting chips 151 and 152 may include at least one of an LED chip having a compound semiconductor such as an ultraviolet (UV) LED chip, a blue LED chip, a green LED chip, a white LED chip, and a red LED chip. The light emitting chips 151 and 152 may include at least one or both of Group II-VI compound semiconductors and Group III-V compound semiconductors. The light emitting chips 151 and 152 may emit at least one of blue, green, blue, UV, and white light. The light emitting chips 151 and 152 may emit light having the same peak wavelength or light having a different peak wavelength. The light emitting chips 151 and 152 may emit light of the same color or different colors.

The light emitting device 100 according to the embodiment may be disposed on the circuit board 400 without additional wire bonding. At least one or both of the light emitting chips 151 and 152 may be mounted on the circuit board 400 in a flip chip bonding manner. The light emitting device 100 shown in FIG. 7 can be realized by at least five light emitting devices that emit light through the top surface and the plurality of side surfaces, thereby improving light extraction efficiency.

The light emitting device 100 may include a resin layer 260 disposed on the light emitting chips 151 and 152. The resin layer 260 may be disposed on the upper surface of the light emitting chips 151 and 152. The resin layer 260 may be disposed on the upper surface and all the side surfaces of the light emitting chips 151 and 152. The resin layer 260 may include a light-transmitting material, for example, an epoxy or a silicon material. The resin layer 260 may include a fluorescent material therein, and the fluorescent material may emit light having a longer wavelength than that emitted from the light emitting chips 151 and 152.

The phosphor may include at least one or more of a blue phosphor, a cyan phosphor, a green phosphor, a yellow phosphor, and a red phosphor, and may be disposed in a single layer or in multiple layers. In the fluorescent film, a phosphor is added in the light transmitting resin material. The light transmitting resin material may include a material such as silicon or epoxy, and the phosphor may be selectively formed from YAG, TAG, Silicate, Nitride, and Oxy-nitride materials. The resin layer 260 may include a fluorescent material such as a quantum dot. The quantum dot may include an II-VI compound or a III-V compound semiconductor, and may include at least one of red, green, yellow, and red quantum dots or different types. The quantum dots are nanometer sized particles that can have optical properties resulting from quantum confinement. The specific composition (s), structure and / or size of the quantum dots can be selected so that light of a desired wavelength is emitted from the quantum dots upon excitation with a specific excitation source. By changing the size, the quantum dots can be adjusted to emit light throughout the visible spectrum. The quantum dot may include one or more semiconductor materials, and examples of the semiconductor material include a Group IV element, a Group II-VI compound, a Group II-V compound, a Group III-VI compound, a Group III- VI compound, an I-III-VI compound, a II-IV-VI compound, a II-IV-V compound, an alloy comprising any of the above, and / or a tertiary and quaternary mixture or alloy , And mixtures of any of the foregoing. The quantum dot is, for example, ZnS, ZnSe, ZnTe, CdS , CdSe, CdTe, GaN, GaP, GaAs, GaSb, InP, InAs, InSb, AlS, AlP, AlAs, PbS, PbSe, Ge, Si, CuInS 2, CuInSe 2 , MgS, MgSe, MgTe, and the like, and combinations thereof.

The light emitted from the light emitting chips 151 and 152 and the wavelength excited by the phosphor may be emitted by the light emitting chips 151 and 152 and the resin layer 260 to which the phosphor is added. The light emitting device 100 may emit white light. As shown in FIG. 8, a resin layer 260 is disposed between the first and second light emitting chips 151 and 152 to prevent the first and second light emitting chips 151 and 152 from contacting each other.

10 to 12, the light emitting device 100A includes at least one or more light emitting chips 151 and 152, a resin layer 260 on the light emitting chips 151 and 152, And reflective side walls 270 and 272 on both sides of the resin layer 260. The light emitting chips 151 and 152 (151 and 152) and the resin layer 260 will be described with reference to the above embodiments.

The reflective sidewalls 270 and 272 may be disposed on at least two sides of the resin layer 260, for example, on the first and second side opposite to each other. The reflective sidewalls 270 and 272 may be adjacent to or corresponding to the first and second incident surfaces 312 and 314 of the optical lens 300 of FIG. The length of the reflective sidewalls 270 and 272 may be the same as the length C1 of the light emitting device 100A and the height may be the same as the thickness C3 of the light emitting device 100. [ The reflective sidewalls 270 and 272 may be disposed on the first and second side surfaces of the resin layer 260 to reflect light traveling to the first and second sides of the light emitting device 100A. The thickness of the reflective sidewalls 270 and 272 (thickness in the horizontal direction) may be in a range of 150 μm or more, for example, 150 μm to 200 μm. If the thickness of the reflective sidewalls 270 and 272 is less than the above range, the light may leak or collapse. If the thickness is larger than the above range, the size of the light emitting device 100A is increased and the recesses 315 ) May be changed.

The reflective sidewalls 270 and 272 may include a resin material, and the resin material may include a metal compound therein. The metal compound may be selectively formed of SiO ₂ , Si ₃ N ₄ , Al ₂ O ₃ , and TiO ₂ . The reflective sidewall may be a laminate of a single layer or multiple layers of resin, but is not limited thereto.

As another example, the reflective sidewalls 270 and 272 may be made of a metal, and may be formed of a metal having a reflectance of 70% or more, for example, a metal of Al, Ag, Ru, Pd, Rh, Pt, Ir, Can be selected. The reflective sidewall may be formed as a single layer or a multi-layer structure made of metal.

The light emitting device 100A may emit the light emitted from the light emitting chips 151 and 152 or the wavelength-converted light from the phosphors. The reflective sidewalls 270 and 272 may reflect the incident light toward the upper surface of the light emitting device. have. The reflective sidewalls 270 and 272 of the light emitting device reflect a part of the light traveling toward the first and second incident planes 312 and 314 of the optical lens 300, Can be adjusted. The light emitting device 100A can emit light through the upper surface and the third and fourth side surfaces (the side surface in the longitudinal direction of the optical lens), so that occurrence of dark portions between adjacent light emitting devices can be reduced.

34A and 34B, the light emitting device 100 without the reflective sidewalls and the reflective sidewall with the reflective sidewalls can be formed as shown in FIGS. 34A and 34B, As a light-directing angle distribution of the light-emitting element 100A, the directivity angle distribution of the light-emitting element having no reflecting sidewall in the major axis direction (longitudinal direction) is wider. In the minor axis direction (width direction) And the distribution is wider.

Fig. 13 shows a first modification of the optical lens of Fig. 2, in which a part of the incident surface of the optical lens is modified. The portions overlapping with the description of the optical lens described above will be omitted.

13, the optical lens 300A may include bottom surfaces 302 and 304, a recess 315, a plurality of incident surfaces 310A, 312 and 314, and a plurality of exit surfaces 340, 342, and 344. FIG. The first incident surface 310A of the plurality of incident surfaces 310A, 312, and 314 may have a flat surface or a horizontal surface. When the first incident surface 310A is a flat surface, the incident efficiency may be improved and the angle of refraction of the incident light of the first incident surface 310A may be changed, so that the width of the first exit surface 340 may become larger . The second and third incident surfaces 312 and 314 of the recess 315 may be convex in the direction of the recess 315.

Fig. 14 is a second modification of the optical lens of Fig. 2, in which the exit surface of the optical lens is modified. 14, the optical lens 300B includes a plurality of exit surfaces 340A, 342, and 344, and the plurality of exit surfaces 340A, 342, and 344 have the same length as the optical lens 300 Lt; / RTI > Of the plurality of exit surfaces 340A, 342, and 344, the center-side first exit surface 340A may be a flat surface rather than a convex curved surface. The first exit surface 340A may be disposed at a position lower than the second and third exit surfaces 342 and 344 and may diffuse light incident on the first incident surface 310. [ When the first exit surface 340A is a convex curved surface, light is condensed, and when the first exit surface 340A is a flat surface, it can be dispersed.

Fig. 15 shows a third modification of the optical lens of Fig. 2, in which a part of the exit surface of the optical lens is modified. The portions overlapping with the description of the optical lens described above will be omitted.

As shown in Fig. 15, out of the exit surfaces 340B, 342 and 344 of the optical lens 300C, the center-side first exit surface 340B has a flat first region 41 and curved surfaces on both sides of the first region 41 And third and fourth regions 42 and 43, respectively. The width X21 of the first region 41 may be equal to or less than half the width X2 of the first exit surface 340B and the width X21 of the first exit surface 340B 1 region 41 can be diffused and emitted. Since the second and third regions 42 and 43 are provided as curved surfaces, the light incident on the first incident surface 310 refracts parallel light and emits the light.

The first region 41 of the first exit surface 340B may be disposed along the longitudinal direction of the optical lens of FIG. For example, the plurality of first regions 41 may be disposed in a region overlapping the light emitting device 100 on the first emitting surface 340, and may be disposed in a region between the first regions 41, May be curved or otherwise planar.

FIG. 16 is a perspective view of a light unit having an optical lens according to the second embodiment, FIG. 17 is a side sectional view of the optical lens of FIG. 16, and FIG. 18 is a cross- FIG.

16 to 18, the light unit 401 includes the optical lens 301 according to the second embodiment. The light unit 401 includes a circuit board 400, a plurality of light emitting devices 100, and an optical lens 301.

17 and 18, the optical lens 301 includes a plurality of bottom surfaces 302 and 304, a recess 315 between the plurality of bottom surfaces 302 and 304, a plurality 322, 324, a plurality of exit surfaces 341, 343, 345, and a plurality of total reflection surfaces 332, 334. In the optical lens 301 according to the second embodiment, as the shapes of the exit surfaces 341, 343 and 345 are changed, the sizes of the entrance surfaces 320, 322 and 324 and the exit surface can be changed.

The thickness Z11 of the optical lens 301 may be 1.4 times or more, for example, 1.5 times to 1.6 times the width X1 of the optical lens 301. [ The optical lens 301 diffuses the incident light and emits the light.

The optical lens 301 may be configured such that the second and third emission surfaces 343 and 345 out of the emission surfaces 341, 343 and 345 are arranged in a horizontal plane. The length Y1 of the optical lens 301 is at least three times the width X1, for example, at least four times or at least four times to six times the width X1, because the second and third emitting surfaces 343 and 345 are provided in a horizontal plane. As shown in FIG. If the length Y1 of the optical lens 301 exceeds the above range, the optical lens 301 may be bent. If the length is smaller than the above range, the number of optical lenses 301 Can be increased.

The second and third emission surfaces 343 and 345 may be disposed at an angle? 3 of 90 ± 2 with respect to a vertical axis. The first and second total reflection surfaces 332 and 334 of the optical lens 301 have an angle? 4 with respect to a straight line connecting both edges of the first and second total reflection surfaces 332 and 334 with respect to a vertical axis, , And 25 degrees to 35 degrees. The first and second total reflection surfaces 332 and 334 may have a curved surface protruding outwardly from a straight line connecting both edges.

The first and second total reflection surfaces 332 and 334 may have a stepped structure in a region adjacent to the bottom surfaces 302 and 304. This can ensure the width of the bottom surfaces 302 and 304 by the stepped structure, It is possible to secure the rigidity of the support protrusions protruding from the base plates 302 and 304.

The width of the first exit surface 341 may be in a range of more than one time, for example, 1.5 times to twice the width of the second and third exit surfaces 343 and 345. The width of the second or third exit surface and the width of the first exit surface 341 may be in the range of 1: 1.5 to 1: 1.9. The width of the first exit surface 341 may be in a range of 6 mm or more, for example, 6.5 mm to 8 mm. If the width of the first exit surface 341 is smaller than the above range, the center-side light efficiency may be lowered. If the width of the first exit surface 341 is larger than the above range, .

The sizes of the incident surfaces 320, 322, and 324 may be changed to correspond to the outgoing surface of the optical lens 301 according to the second embodiment. The incidence planes 320,322 and 324 include a first incidence plane 320 on the recess 315 and second and third incidence planes 322 and 324 on opposite sides of the recess 315. The first and second incidence planes 320 and 324 may be curved or inclined planes protruding in the direction of the recess 315. The first and second incidence planes 320 and 324 may be curved.

The width D13 of the first incident surface 320 may be less than 1/4 of the width X12 of the first exit surface 341 and may range from 2 mm to 3 mm, for example. The ratio of the width D13 of the first incident surface 320 to the width X12 of the second exit surface 341 may range from 1: 2.7 to 1: 3.3.

The difference between the top width D13 and the bottom width D12 of the recess 315 may be in the range of 0.8 mm or more, for example, 0.8 mm to 1.2 mm. The bottom width D12 of the recess 315 may be in the range of 3 mm or more, for example, 3 mm to 4 mm, and the top width D13 of the recess 315 may be in the range of 2 mm to 2.8 mm. The bottom width D13 of the recess 315 may be wider than the width of the light emitting device described later. The upper width D12 of the recess 315 may be wider than the width of the light emitting device described later.

Referring to FIG. 18, the optical lens 301 has a first angle formed by both edges 112 and 12 of the first incident surface 320 with respect to the bottom center ZO of the recess 315 R4 may have a range of 60 degrees or more, for example, 60 degrees to 70 degrees. The first angle R4 formed by the first incident surface 320 from the bottom center ZO of the recess 315 may vary depending on the orientation angle of the light emitting device.

The first angle may be greater than a second angle R5 formed by the first exit surface 341 with respect to the bottom center ZO of the recess 315. [ The difference between the first angle R4 and the second angle R5 may have a difference of 8 degrees or more, for example, 8 degrees to 15 degrees. If the difference between the first and second angles R4 and R5 is smaller than or greater than the above range, the thickness of the optical lens 301 may be influenced or the optical efficiency may be changed.

The third angle R6 between the two edges P3 and P4 of the second and third exit surfaces 343 and 345 to the bottom center ZO of the recess 315 is greater than 90 degrees, Lt; / RTI > The third angle R6 may distinguish the areas of the second and third exit surfaces 343 and 345 from the first and second total reflection surfaces 332 and 334.

As shown in FIG. 17, the first and second total reflection surfaces 332 and 334 may have an angle .theta.4 between the first and second total reflection surfaces 332 and 334 with respect to a straight line connecting both edges with respect to a vertical axis, for example, from about 25 degrees to about 35 degrees. The first and second total reflection surfaces 332 and 334 may have a curved surface protruding outwardly from a straight line connecting both edges. The straight line connecting the both edges of the first and second total reflection surfaces 332 and 334 provides a tilted surface with respect to the vertical axis so that the light incident on the second and third incident surfaces 322 and 324 is reflected by the second and third And can be reflected by the exit surfaces 343 and 345. The directivity angle distribution of the light emitted from the optical lens 301 according to the embodiment can be found within a range of 30 degrees or less, for example, 20 degrees to 30 degrees from the central axis as shown in FIG. 33 (b).

19 to 21 are views showing first to third modifications of the optical lens 17.

19, the optical lens may include bottom surfaces 302 and 304, a recess 315, a plurality of incident surfaces, and a plurality of exit surfaces 341, 343, and 345. The first incident surface 320 of the plurality of incident surfaces 320A, 322, and 324 may have a flat surface or a horizontal surface. In the case where the first incident surface 320A is a flat surface, the incident efficiency may be improved and the angle of refraction of the incident light of the first incident surface 320A may be different, so that the width of the first exit surface 341 may become larger . The second and third incident surfaces 322 and 324 of the recess 315 may be convex in the direction of the recess 315.

Fig. 20 shows a second modification of the optical lens of Fig. 17, in which the exit surface of the optical lens is modified. The optical lens includes an exit surface 341A, and the exit surface 341A may have a length equal to the length of the optical lens as shown in FIG. Among the exit surfaces 341A, the exit side of the center side and the side of the exit side may be a flat surface, not a convex surface.

Fig. 21 shows a third modified example of the optical lens of Fig. 17, in which a part of the exit surface of the optical lens is modified. The portions overlapping with the description of the optical lens described above will be omitted.

As shown in Fig. 21, among the exit surfaces 341B, 343 and 345 of the optical lens, the center-side first exit surface 341B has a flat first region, a second and a third Regions 46 and 47. In this embodiment, The width of the first region 45 may be equal to or less than half the width of the first exit surface 341 and the width of the first region 45 may be less than half the width of the first exit surface 341, It is possible to diffuse and emit light. Since the second and third regions 46 and 47 are provided as curved surfaces, the light incident on the first incident surface 320 is refracted and emitted in parallel.

The first region 45 of the first exit surface 341 may be disposed along the longitudinal direction of the optical lens of FIG. For example, a plurality of first regions may be arranged in a region overlapping the light emitting element on the first exit surface 341, and an area between the first regions, that is, a region between the light emitting elements, have.

22 is a perspective view of a light unit having an optical lens according to the third embodiment, FIG. 23 is a view showing an optical lens of the light unit of FIG. 22, FIG. 24 is a cross- 25 is a view showing support protrusions of the optical lens in the light unit of Fig.

22 to 25, the light unit 401 includes a circuit board 400, a plurality of light emitting devices 100 according to an embodiment disposed on the circuit board 400, and the circuit board 400, And includes a plurality of optical lenses 301A.

The light emitting device 100 may be disposed on the optical lens 301A and the circuit board 400. FIG. The light emitting device 100 may be disposed above the bottom surfaces 302 and 304 of the optical lens 301A.

The length and the width of the optical lens 301A will be described with reference to the configuration of FIG. The optical lens 301A is arranged such that the second and third emission surfaces 372 and 374 are arranged in a horizontal plane among the emission surfaces 370 and 374 and the second and third emission surfaces 372 and 374 and the first and second total reflection surfaces 362 and 364 ) Is an edge region, which may be an angular surface or a curved surface. This can be provided by curving the edge regions of the first and second exit surfaces 372 and 374 by an injection or extrusion process.

The first and second bottom surfaces 302 and 304 of the optical lens 301A may be disposed on the upper surface of the circuit board 400 or may be disposed on the inner side of the upper surface of the circuit board 400. [

The optical lens 301A includes a plurality of legs 361 and 363 and the plurality of legs 361 and 363 may protrude from both sides of the recess 315. [ The legs 361 and 363 have the same length as the length of the optical lens 301A and can support the optical lens 301A.

The recess 315 may include first to third incident surfaces 350, 352 and 354, and the first incident surface 350 may be a convex curved surface or a flat surface in the direction of the light emitting element. The second and third incident surfaces 322 and 324 are disposed on both sides of the light emitting device 100A and refract the incident light to the first and second total reflection surfaces 362 and 364. The second and third incident surfaces 322 and 324 may be arranged in a plane perpendicular to the horizontal axis, or may be curved or inclined.

The width C5 of the recess 315 of the optical lens 301A may be a distance between the first and second leg portions 361 and 363 and may be wider than the width of the light emitting device 100A. Here, the light emitting device 100A may be the same as the light emitting device shown in FIG. 12 or the light emitting device shown in FIG. At this time, the light emitted from the light emitting device 100A travels to the upper region of the first and second leg portions 361 and 363, so that the light can be incident on the first and second total reflection surfaces 362 and 364.

25, a plurality of support protrusions 381 and 382 may be disposed on the bottom surfaces 302 and 304 of the optical lens 301A. The plurality of support protrusions 381 and 382 may be coupled to the circuit board 400 or another fixing structure to fix the optical lens 301A. The plurality of support protrusions 381 and 382 may have a bottom view shape, a circular shape, a polygonal shape, or an elliptical shape.

As shown in FIGS. 23 and 25, the lateral protrusions 377 may be disposed on the outer walls 376 and 378 of the optical lens 301A. The side protrusions 377 may be disposed on one or both sides and may be a gate region for injection molding of the optical lens 301A. The outer side walls 376 and 378 of the optical lens 301A may be a plane perpendicular to the Z axis direction or a plane inclined. Since the side projections 376 and 378 are disposed in regions that do not affect the optical characteristics, the light loss can be reduced. The width of the side projection 376 may be in the range of 2 mm, e.g., 2 mm to 4 mm, the projection thickness may be in the range of 0.3 mm, e.g., 0.3 mm to 0.7 mm, and the height may be in the range of 1 mm or more, e.g., 1 mm to 2 mm. The size of the side projections 376 and 378 may vary depending on the gate.

The boundary regions 362A and 364A between the total reflection surfaces 362 and 364 and the outer side walls 376 and 378 may be angled or curved. In the case of a curved surface, the radius of curvature may range from 0.2 mm to 0.6 mm. The boundary regions 362A and 364A having such a radius of curvature can be easily separated during injection molding.

Referring to FIG. 26, the outer walls 376A and 376B of the optical lens 301A may be disposed on the inclined surfaces in the outward direction (X-axis direction) with respect to the center to facilitate separation in the injection process. The outer side walls 376A and 376B of the optical lens 301A may be an angle? 8 of 5 degrees or less, for example, 4 degrees or less with respect to a horizontal straight line, If the diameter is less than the above range, the effect of improving the separation efficiency of the injection lens 301A may be insignificant. Embodiments can provide an inclined structure to the outer walls 376A and 376B of the optical lens 301A to reduce light loss and facilitate separation during the manufacturing process.

Figs. 27 to 29 are views for explaining the coupling structure of the optical lens 301A according to the embodiment.

Referring to FIG. 27, the optical lens 301A is provided with receiving grooves 391 and 393 at the bottom thereof, and the receiving grooves 391 and 393 may extend to both sides of the bottom of the recess 355. FIG. The storage grooves 391 and 393 are disposed under the respective legs 361 and 363 to provide a storage space. The width E7 of the receiving grooves 391 and 393 may be wider than the width E1 of the recess 315. [ The width E7 of the receiving grooves 391 and 393 may be wider than the width of the circuit board 400 and the circuit board 400 may be inserted.

The optical lens 301A includes first and second bottom portions 365 and 366 extending outwardly from the bottom of the leg portions 361 and 363 and at least one or both of the first and second bottom portions 365 and 366 may have one or more The engaging projection 368 of the engaging projection 368 can be disposed. The engaging projection 368 may have a protrusion structure having a locking protrusion in the longitudinal direction as shown in Fig. 27, a protrusion structure 368A having a locking protrusion in the width direction as shown in Fig. 28, Columnar structures 369 and 369A. The coupling protrusions may be coupled to a structure such as a bottom cover.

27 and 28, any one of the first and second bottom portions 365 and 366 of the optical lens 301A may include an inclined surface 366A outside the upper surface, and the inclined surface 366A The outer sides of the first and second bottom portions 361 and 363 can be fitted into the fixing structure.

The light unit 401 having the optical lenses 300, 301, and 301A according to the embodiment can be applied to a display device, a three-dimensional display, various illumination lamps, a traffic light, a vehicle headlight, and an electric signboard.

30 is a view showing a lighting device having an optical lens and a light unit according to the embodiment.

30, the lighting device includes a housing 450 having a storage space 455, a heat dissipation plate 470 disposed on one side of the housing 450, and a heat dissipation plate 470 disposed inside the heat dissipation plate 470 A light unit 401 having an optical lens 300 according to the example, a reflective sheet 440 for reflecting the light emitted through the optical lens 300, the reflective sheet 440, and the optical lens 300 And an optical member 460 for diffusing the light emitted therefrom.

The housing 450 has a storage space 455 therein to diffuse the light emitted from the light unit 401 to the entire area. The housing 450 may include at least one of a polycarbonate, a polyethylene terephthalate glycol (PETG), a polyethylene (PE), a polystyrene paper (PSP), a polypropylene (PP), and a polyvinyl chloride can do. The housing 450 may be formed of a material having high light reflectivity, or a reflective layer may be further formed on the inner surface. The housing 450 may be formed of a metal material, but the present invention is not limited thereto.

The reflective sheet 440 may be disposed on a surface of the housing 450, for example, in an area for reflecting the light emitted from the optical lens 300 in the direction of the optical member 460. The reflective sheet 440 may be disposed on the inner ceiling of the housing 450. The reflective sheet 440 may be formed of, for example, PET poly (ethylene terephthalate), PC (polycarbonate), or PVC poly (vinyl chloride) resin, but is not limited thereto.

The optical member 460 may include a diffusion sheet 461 and a protective sheet 463. [ The diffusion sheet 461 diffuses the light reflected from the optical lens 300 through the reflective sheet 440 so that the light is irradiated to the illumination area with uniform light intensity. The protective sheet 463 can protect the surface of the illumination device.

The optical member 460 may include at least one of a diffusion material such as polymethylmethacrylate (PMMA), polypropylene (PP), polyethylene (PE), and polystyrene (PS). A plurality of optical sheets may be disposed on the optical member 180, but the present invention is not limited thereto. A display panel may be further disposed outside the optical member 460, but the present invention is not limited thereto. The display panel may include a liquid crystal panel.

The light emitting chips 151 and 152 disclosed in FIGS. 7 to 12 according to the embodiment may include, for example, a warm white LED and a cool white LED. Warm white light emitting diodes and cool white light emitting diodes emit white light. White light emitting diodes and cool white light emitting diodes can emit white light of mixed light by radiating the correlated color temperature, so that a color rendering index (CRI) indicating a close proximity to natural sunlight is increased. 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.

31 is an example of a light emitting device according to the embodiment.

Referring to FIG. 31, the light emitting device 100 includes a light emitting chip 151 and a resin layer 260 on the outer side of the light emitting chip 151. The resin layer 260 may include a phosphor to convert the wavelength of incident light. The light emitted from the light emitting chip 151 is emitted on the light emitting device 100 by being disposed in the recess 315 of the optical lens 300 according to the embodiment. The light emitting device 100 will be described in detail with respect to the first light emitting chip 151 for convenience of description and the description of the second light emitting chip will be referred to the description of the first light emitting chip 151. [

The light emitting chip 151 includes a light emitting structure 225 and a plurality of pads 245 and 247. The light emitting structure 225 may be formed of a compound semiconductor layer of a group II to VI element, for example, a compound semiconductor layer of a group III-V element, or a compound semiconductor layer of a group II-VII element. The plurality of pads 245 and 247 are selectively connected to the semiconductor layer of the light emitting structure 225 to supply power.

The light emitting structure 225 includes a first conductive semiconductor layer 222, an active layer 223, and a second conductive semiconductor layer 224. The light emitting chip 151 may include a substrate 221. The substrate 221 is disposed on the light emitting structure 225. The substrate 221 may be, for example, a light-transmitting substrate, an insulating substrate, or a conductive substrate. The first conductive semiconductor layer 222 may be an n-type semiconductor layer, and the second conductive semiconductor layer 224 may be a p-type semiconductor layer. In contrast, the first conductive semiconductor layer 222 may be a p-type semiconductor layer, and the second conductive semiconductor layer 224 may be an n-type semiconductor layer. The light emitting structure 225 may include at least one of an n-p junction, a p-n junction, an n-p-n junction, and a p-n-p junction. The light emitting chip 151 may include a device such as a zener diode or a FET.

The light emitting chip 151 has pads 245 and 247 disposed thereunder and the pads 245 and 247 include first and second pads 245 and 247. The first and second pads 245 and 247 are spaced apart from each other below the light emitting chip 151. The first pad 245 is electrically connected to the first conductive semiconductor layer 222 and the second pad 247 is electrically connected to the second conductive semiconductor layer 224. [ The first and second pads 245 and 247 may have a polygonal or circular bottom shape or a shape corresponding to a pattern of the circuit board.

The light emitting chip 151 may include at least one of a buffer layer (not shown) and an undoped semiconductor layer (not shown) between the substrate 221 and the light emitting structure 225. The buffer layer is a layer for relaxing the difference in lattice constant between the substrate 221 and the semiconductor layer, and may be selectively formed from Group II to VI compound semiconductors. An undoped Group III-V compound semiconductor layer may be further formed under the buffer layer, but the present invention is not limited thereto. The substrate 221 can be removed. When the substrate 221 is removed, the phosphor layer 250 may contact the upper surface of the first conductive type semiconductor layer 222 or the upper surface of another semiconductor layer.

The light emitting chip 151 includes first and second electrode layers 241 and 242, a third electrode layer 243, and insulating layers 231 and 233. Each of the first and second electrode layers 241 and 242 may be formed as a single layer or a multilayer, and may function as a current diffusion layer. The first and second electrode layers 241 and 242 include a first electrode layer 241 disposed under the light emitting structure 225; And a second electrode layer 242 disposed under the first electrode layer 241. The first electrode layer 241 diffuses a current, and the second electrode layer 241 reflects incident light.

The first and second electrode layers 241 and 242 may be formed of different materials. The first electrode layer 241 may be formed of a light-transmitting material, for example, a metal oxide or a metal nitride. The first electrode layer may include at least one of indium tin oxide (ITO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (IZO) indium gallium zinc oxide, indium gallium tin oxide (IGTO), aluminum zinc oxide (AZO), antimony tin oxide (ATO), and gallium zinc oxide (GZO). The second electrode layer 242 may contact the lower surface of the first electrode layer 241 and function as a reflective electrode layer. The second electrode layer 242 includes a metal such as Ag, Au, or Al. The second electrode layer 242 may partially contact the lower surface of the light emitting structure 225 when the first electrode layer 241 is partially removed.

As another example, the structures of the first and second electrode layers 241 and 242 may be stacked in an omni directional reflector layer (ODR) structure. The omnidirectional reflection structure may have a stacked structure of a first electrode layer 241 having a low refractive index and a second electrode layer 242 made of a highly reflective metal material in contact with the first electrode layer 241. The electrode layers 241 and 242 may have a laminated structure of, for example, ITO / Ag. The total reflection angle at the interface between the first electrode layer 241 and the second electrode layer 242 can be improved.

As another example, the second electrode layer 242 may be removed and formed of a reflective layer of another material. The reflective layer is a distributed Bragg reflection: can be formed of (distributed bragg reflector DBR) structure, and the distributed Bragg reflection structure to each other comprises a structure du dielectric layers are arranged alternately having different refractive indices, e.g., SiO ₂ layer , A Si ₃ N ₄ layer, a TiO ₂ layer, an Al ₂ O ₃ layer, and a MgO layer, respectively. As another example, the electrode layers 241 and 242 may include both a dispersed Bragg reflection structure and an omnidirectional reflection structure. In this case, the light emitting chip 151 having a light reflectance of 98% or more can be provided. Since the light emitted from the second electrode layer 242 is emitted through the substrate 221, the light-emitting chip 151 mounted in the flip-type can emit most light in the vertical direction.

The third electrode layer 243 is disposed under the second electrode layer 242 and is electrically insulated from the first and second electrode layers 241 and 242. The third electrode layer 243 may be formed of a metal such as titanium, copper, nickel, gold, chromium, tantalum, platinum, tin, ), Silver (Ag), and phosphorus (P). A first pad 245 and a second pad 247 are disposed under the third electrode layer 243. The insulating layers 231 and 233 prevent unnecessary contact between the first and second electrode layers 241 and 242, the third electrode layer 243, the first and second pads 245 and 247, and the light emitting structure 225. The insulating layers 231 and 233 include first and second insulating layers 231 and 233. The first insulating layer 231 is disposed between the third electrode layer 243 and the second electrode layer 242. The second insulating layer 233 is disposed between the third electrode layer 243 and the second half pads 245 and 247. The first and second pads 245 and 247 may include the same material as the first and second lead electrodes 415 and 417.

The third electrode layer 243 is connected to the first conductive semiconductor layer 222. The connection part 244 of the third electrode layer 243 protrudes in a via structure through the first and second electrode layers 241 and 242 and the lower part of the light emitting structure 225 and contacts the first conductivity type semiconductor layer 222 do. The connection portions 244 may be arranged in a plurality. A portion 232 of the first insulating layer 231 extends around the connection portion 244 of the third electrode layer 243 to form the third electrode layer 243 and the first and second electrode layers 241 and 242, The conductive connection between the two-conductivity-type semiconductor layer 224 and the active layer 223 is cut off. An insulating layer may be disposed on the side surface of the light emitting structure 225 for lateral protection, but the present invention is not limited thereto.

The second pad 247 is disposed below the second insulating layer 233 and contacts the at least one of the first and second electrode layers 241 and 242 through an open region of the second insulating layer 233 Or connected. The first pad 245 is disposed below the second insulating layer 233 and is connected to the third electrode layer 243 through an open region of the second insulating layer 233. [ The protrusion 248 of the first pad 247 is electrically connected to the second conductive semiconductor layer 224 through the first and second electrode layers 241 and 242 and the protrusion 246 of the second pad 245 Is electrically connected to the first conductive type semiconductor layer 222 through the third electrode layer 243.

The first and second pads 245 and 247 are spaced apart from each other at a lower portion of the light emitting chip 151 and face the pattern of the circuit board.

The first pad 245 and the second pad 247 of the light emitting chip 151 may be bonded to a circuit board with a bonding member. The joining member may include a solder paste material. The solder paste material includes at least one of Au, Sn, Pb, Cu, Bi, In, and Ag. As another example, the bonding member may include a conductive film, and the conductive film includes at least one conductive particle in the insulating film. The conductive particles may include at least one of, for example, a metal, a metal alloy, and carbon. The conductive particles may include at least one of nickel, silver, gold, aluminum, chromium, copper, and carbon. The conductive film may include an anisotropic conductive film or an anisotropic conductive adhesive.

The light emitting chip 151 may emit light through the surface of the circuit board 400 and the side surface and the upper surface of the light emitting structure 225 to improve light extraction efficiency. Such a light emitting device has a plurality of light emitting chips and can be bonded on a circuit board in a flip chip manner, so that the process can be simplified. Further, since heat dissipation of the light emitting element is improved, it can be usefully used in the field of illumination and the like.

The resin layer 260 may be disposed on the upper surface and the side surface of the light emitting chip 151 to change the wavelength of emitted light to prevent moisture penetration. Although the lower side of the resin layer 260 is disposed to the outside of the pads 245 and 247, any one of the electrode layers 241, 242, and 243 may be formed, but the present invention is not limited thereto.

32 is another example of the light emitting element of Fig. In the description of FIG. 32, the same structure as FIG. 31 will be described with reference to FIG. 31.

Referring to FIG. 32, reflective members 271 and 272 are disposed on an outer wall of the light emitting device, and the reflective member may be disposed on an outer surface of the resin layer 260. The resin layer 260 may be disposed between the reflective members 270 and 272 and the light emitting chip 151. The reflective members 270 and 272 may reflect incident light. The light emitting device of the embodiment is described as an example in which the reflecting member is disposed on two side surfaces of the resin layer 260, but it may be disposed on three or four side surfaces. Further, as shown in Fig. 5, the reflective member may be further disposed on the outermost side of the light emitting device disposed on the outermost one of the light emitting devices arranged on the circuit board, thereby preventing light leakage. In this light emitting device, light emitted to both sides of the light emitting chip 151 can be reflected by the reflecting member to the incident surface area of the optical lens.

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: Light emitting element
151, 152: Light emitting chip
260: resin layer
300, 300A, 300B, 300C, 301, 301A: optical lens
302, 304:
310, 310A, 320, 320A: first incident surface
312, 322: second incident surface
314,324: Third incident surface
315: recess
332, 334:
340, 341: a first emitting surface
342,343: a second exit surface
344,345: Third exit surface
400: circuit board
401: Light Unit

Claims (17)

First and second bottom surfaces spaced apart from each other and having a longer length in a second axial direction than a first axial direction in a lower portion of the transparent body;
A recess disposed between the first and second bottom surfaces and having a length in a second axial direction;
A plurality of incident surfaces having a first incident surface on the upper surface of the recess, a second incident surface and a third incident surface corresponding to both sides of the recess;
A first total reflection plane and a second total reflection plane disposed on opposite sides of the body; And
And a second exit surface on the upper center of the body, and second and third exit surfaces on both sides of the first exit surface. The optical lens according to claim 1, wherein the first incident surface has a convex curved surface toward the bottom of the recess. The optical lens according to claim 1, wherein the first incident surface has a flat surface. The optical lens according to claim 2 or 3, wherein the first exit surface has a width larger than the width of the first incident surface and has a convex curved surface. The optical lens according to claim 2 or 3, wherein the first exit surface is arranged in a flat horizontal plane with a width wider than the width of the first incident surface. 5. The light-emitting device according to claim 4, wherein the second and third emission surfaces have inclined surfaces with respect to a horizontal straight line, and the inclined surfaces have a higher height toward the outside and are arranged lower than the peak of the curved surface of the first exit surface The optical lens being. The optical lens according to claim 4, wherein the second and third emission surfaces have a horizontal plane. The optical lens according to claim 4, wherein the length in the second axial direction is four times or more the length in the first axial direction. The optical lens according to claim 4, wherein the second and third incident surfaces have a convex curved surface or an inclined surface in the recess direction. The optical lens according to claim 4, wherein the first and second total reflection surfaces have curved surfaces that are convex outwardly than straight lines connecting both edges. The optical lens according to claim 4, wherein a first angle connecting both edges of the first incident surface with respect to a bottom center of the recess is larger than a second angle connecting both edges of the first exit surface. An optical lens according to claim 4;
A plurality of light emitting elements arranged in a recess of the optical lens; And
And a circuit board under the light emitting element. 13. The method of claim 12,
Wherein the light emitting element emits light in three or five planes. 13. The method of claim 12,
Each of the light emitting elements includes a plurality of light emitting chips; And a resin layer disposed around the plurality of light emitting chips,
Wherein the resin layer comprises a phosphor. 15. The light unit according to claim 14, wherein the light emitting element includes reflective sidewalls arranged on both sides of the resin layer in a second axial direction. 13. The light unit according to claim 12, wherein the optical lens includes a support projection projecting downward. A lighting device having the light unit of claim 12.

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