KR20150031718A - Light emitting device package - Google Patents

Abstract

An embodiment of the present invention provides a light emitting device package comprising: a package body including at least one ceramic layer, and having a cavity; a light emitting device disposed on a bottom surface of the cavity; and a lens disposed on the top of the package body. A surface of the lens has at least one inflection point.

Description

[0001] LIGHT EMITTING DEVICE PACKAGE [0002]

An embodiment relates to a light emitting device package.

BACKGROUND ART Light emitting devices such as a light emitting diode (LD) or a laser diode using semiconductor materials of Group 3-5 or 2-6 group semiconductors are widely used for various colors such as red, green, blue, and ultraviolet And it is possible to realize white light rays with high efficiency by using fluorescent materials or colors, and it is possible to realize low power consumption, semi-permanent life time, quick response speed, safety, and environment friendliness compared to conventional light sources such as fluorescent lamps and incandescent lamps It has the advantage of gender.

Therefore, a transmission module of the optical communication means, a light emitting diode backlight replacing a cold cathode fluorescent lamp (CCFL) constituting a backlight of an LCD (Liquid Crystal Display) display device, a white light emitting element capable of replacing a fluorescent lamp or an incandescent lamp Diode lighting, automotive headlights, and traffic lights.

FIG. 1A is a view showing a conventional light emitting device package, and FIG. 1B is a view showing a distribution of light emitted from the light emitting device package of FIG. 1A.

A conventional light emitting device package 100 includes a first lead frame 121 and a second lead frame 122 disposed on a package body 110 and a first lead frame 121 and a second lead frame 122, The light emitting element 10 is electrically connected.

The first lead frame 121 and the second lead frame 122 are arranged to pass through the package body 110 and the light emitting element 10 is disposed on one side of the package body 110, The first electrode 10a and the second electrode 10b may be electrically connected to the first lead frame 121 and the second lead frame 122 by wires 141 and 142, respectively.

The lens 150 is disposed on the light emitting element 10 to change the course of the light emitted from the light emitting element 10. [ The cross section of the lens 150 may be a shape having a lower height of a central region corresponding to the light emitting device 10 as shown in FIG.

As shown in FIG. 1B, most of the light emitted from the light emitting device package shown in FIG. 1A travels in an angle range of 60 degrees to 90 degrees. Accordingly, the amount of light traveling forward of the light emitting device package is too small .

The embodiment attempts to improve the directivity angle of light emitted from the light emitting device package.

An embodiment includes a package body having at least one ceramic layer and having a cavity; A light emitting element disposed on a bottom surface of the cavity; And a lens disposed at the top of the package body, wherein the surface of the lens has at least one inflection point.

The surface of the light output portion in the direction opposite to the light emitting element may have the inflection point.

The surface of the light incidence portion facing the light emitting element may be flat.

The surface of the lens may be symmetrical about the inflection point.

The light emitting device package further includes a cover layer disposed on the uppermost end of the ceramic layer, and the lens can be disposed on the cover layer.

The radius of curvature of the surface of the lens can be arranged such that light emitted from the lens converges in one area.

In the light emitting device package according to the embodiment, light emitted from the light emitting device may converge in a region corresponding to the center of the light emitting device package, and may be symmetric with respect to the center corresponding to the center.

1A is a view showing a conventional light emitting device package,
FIG. 1B is a view showing a distribution of light emitted from the light emitting device package of FIG. 1A,
2A to 2C are views showing one embodiment of a light emitting device package,
FIGS. 3A and 3B are views showing one embodiment of a light emitting device in a light emitting device package,
FIG. 4A is a cross-sectional view of the lens of FIGS. 2A-2C,
4B is a perspective view of the lens of FIGS. 2A-2C,
5A is an illuminance distribution of light emitted in one embodiment of the light emitting device package,
5B is an orientation distribution of light emitted in an embodiment of the light emitting device package,
6 is a view showing an embodiment of a sterilizing apparatus including a light emitting device package,
7 is a view showing an embodiment of a lighting apparatus including a light emitting device package.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

In the description of the embodiment according to the present invention, in the case of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) or under are all such that two elements are in direct contact with each other or one or more other elements are indirectly formed between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

2A to 2C are views showing one embodiment of a light emitting device package,

In the light emitting device package 200 according to the embodiment, the package body includes a plurality of ceramic layers 210a, 210b, 210c, and 210d. The package body may be implemented using High Temperature Cofired Ceramics (HTCC) or Low Temperature Cofired Ceramics (LTCC) technology.

When the package body is a multilayer ceramic substrate, the thickness of each layer may be the same or different. The package body may be made of an insulating material of nitride or oxide and may include, for example, SiO ₂ , Si _x O _y , Si ₃ N _y , SiO _x N _y , Al ₂ O _3, or AlN.

The width of the plurality of ceramic layers 210a, 210b, 210c and 210d may be different from each other, and a part of the ceramic layers 210a and 210b may form the bottom of the light emitting device package 200 or the cavity, Some of the ceramic layers 210c and 210d may form the side walls of the cavity.

The light emitting device 10 is disposed on the bottom surface of the cavity formed by the plurality of ceramic layers 210a and 210b. At least two light emitting devices 10 may be disposed.

The light emitting device 10 is disposed on the submount 250 and may be eutectic-bonded to the metal and the submount 250 may contact or be coupled to the bottom surface of the cavity through the inorganic paste layer 220. A ceramic layer may be disposed on the bottom surface of the cavity where the submount 220 is disposed, or a heat dissipating unit 280 may be disposed.

The heat dissipation unit 280 may be made of a material having excellent thermal conductivity, and may be made of CuW. In FIG. 2A, one heat dissipation unit 230 is shown, but the heat dissipation unit 280 may be divided into two or more heat dissipation units.

The heat dissipating unit 230 may be disposed inside the ceramic layers 210a and 210b and a ceramic layer may be disposed on the heat dissipating unit 230 and the ceramic layers 210a and 210b to form a ceramic layer 210a, 210b can be prevented from being thermally expanded.

3A and 3B are views showing one embodiment of a light emitting device in a light emitting device package.

Referring to FIG. 3A, the light emitting device 10 includes a substrate 11 and a buffer layer 12 and a light emitting structure.

The substrate 11 may be formed of a material suitable for semiconductor material growth or a carrier wafer, may be formed of a material having excellent thermal conductivity, and may include a conductive substrate or an insulating substrate. For example, at least one of sapphire (Al ₂ O ₃ ), SiO ₂ , SiC, Si, GaAs, GaN, ZnO, GaP, InP, Ge and Ga ₂ O ₃ can be used.

The buffer layer 12 is intended to mitigate the difference in lattice mismatch and thermal expansion coefficient of the material between the substrate 11 and the light emitting structure in the present embodiment and the material of the buffer layer 12 is a group III- AlN, AlN, GaN, InN, InGaN, AlGaN, InAlGaN, and AlInN.

When a substrate 11 is formed of sapphire or the like and a light emitting structure containing GaN or AlGaN is disposed on the substrate 11, the lattice mismatch between GaN and AlGaN and sapphire is very large, Since the difference in expansion coefficient is very large, dislocation, melt-back, crack, pit, surface morphology defects, etc., which deteriorate crystallinity may occur, (12) can be used.

An undoped GaN layer 13 or an AlGaN layer is disposed between the buffer layer 12 and the light emitting structure to prevent the potentials and the like from being transferred into the light emitting structure. Further, the dislocation is blocked even in the buffer layer 12, so that it is possible to grow a buffer layer of high quality / high crystallinity.

The light emitting structure includes a first conductive semiconductor layer 14, an active layer 15, and a second conductive semiconductor layer 16.

The first conductive semiconductor layer 14 may be formed of a compound semiconductor such as Group III-V or Group II-VI, and may be doped with a first conductive dopant. The first conductive semiconductor layer 14 is a semiconductor material having a composition formula of Al _x In _y Ga _(1-xy) N (0 = x = 1, 0 = y = 1, 0 = x + y = 1) , GaN, InAlGaN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP.

When the first conductivity type semiconductor layer 14 is an n-type semiconductor layer, the first conductivity type dopant may include n-type dopants such as Si, Ge, Sn, Se, and Te. The first conductive semiconductor layer 14 may be formed as a single layer or a multilayer, but the present invention is not limited thereto.

The first conductivity type semiconductor layer 14 may include at least one of InAlGaN and AlGaN when the light emitting element 10 is ultraviolet (UV), deep ultraviolet (Deep UV) -Type semiconductor layer 14 is made of AlGaN, the content of Al may be 50%. In the case of a light emitting device that emits a deep ultraviolet ray, a large amount of deep ultraviolet light is absorbed in GaN, so that AlGaN can be used as a material of the light emitting structure.

The active layer 15 is disposed between the first conductivity type semiconductor layer 14 and the second conductivity type semiconductor layer 16 and may have a single well structure, a multi-well structure, a single quantum well structure, A multi quantum well (MQW) structure, a quantum dot structure, or a quantum wire structure.

InGaN / InGaN, InGaN / InGaN, AlGaN / GaN, InAlGaN / GaN, GaAs (InGaAs), and AlGaN / AlGaN / InGaN / GaN, / AlGaAs, GaP (InGaP) / AlGaP, but is not limited thereto. The well layer may be formed of a material having an energy band gap smaller than the energy band gap of the barrier layer. In particular, the active layer 15 according to the embodiment may generate ultraviolet light or deep ultraviolet light. In this case, the active layer 15 may have a multi-quantum well structure. Specifically, the active layer 15 may include Al _x Ga _(1-x) A quantum well structure including a quantum well layer including N (0 <x <1) and a quantum well layer including Al _y Ga _(1-y) N (0 <x <y <1) Where the quantum well layer may comprise a dopant of a second conductivity type as described below.

The second conductivity type semiconductor layer 16 may be formed of a semiconductor compound. The second conductive semiconductor layer 16 may be formed of a compound semiconductor such as Group III-V or Group II-VI, and may be doped with a second conductive dopant. The second conductivity type semiconductor layer 16 is formed of a semiconductor material having a composition formula of In _x Al _y Ga _{1 -x- y} N (0 = x = 1, 0 = y = 1, 0 = x + y = 1) , AlGaN, GaN AlInN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP.

When the second conductivity type semiconductor layer 16 is a p-type semiconductor layer, the second conductivity type dopant may be a p-type dopant such as Mg, Zn, Ca, Sr, and Ba. The second conductivity type semiconductor layer 16 may be formed as a single layer or a multilayer, but is not limited thereto. The second conductivity type semiconductor layer 16 may include at least one of InAlGaN and AlGaN when the light emitting element 10 is ultraviolet (UV), deep ultraviolet (Deep UV), or unpolarized light emitting element.

Although not shown, an electron blocking layer may be disposed between the active layer 15 and the second conductivity type semiconductor layer 16, and an electron blocking layer having a superlattice structure may be disposed . For example, AlGaN doped with a second conductive dopant may be disposed in the superlattice, and a plurality of GaN layers having different composition ratios of aluminum may be interleaved to form a layer.

The GaN layer 17 may be disposed on the light emitting structure so that current can be uniformly supplied from the second electrode 10b to the second conductivity type semiconductor layer 16 over a wide area.

In order to supply current to the first conductivity type semiconductor layer 14 when the substrate 11 is an insulating substrate, the first conductivity type semiconductor layer 14 is mesa-etched from the GaN 17 to a part of the first conductivity type semiconductor layer 14, A portion of the layer 14 may be exposed.

The first electrode 10a may be disposed on the exposed first conductivity type semiconductor layer 14 and the second electrode 10b may be disposed on the GaN 17. [ The first electrode 10a and / or the second electrode 10b may be formed of a conductive material such as a metal. More specifically, the first electrode 10a and / or the second electrode 10b may be formed of Ag, Ni, Al, Rh, Pd, Ir, Pt, Au, Hf, and an optional combination thereof, and may be formed as a single layer or a multilayer structure.

In Fig. 3B, a vertical light emitting device is disposed. 3B, an undoped GaN layer 13 is disposed on a light emitting structure including a first conductive semiconductor layer 14, an active layer 15, and a second conductive semiconductor layer 16, Irregularities may be formed on the surface of the substrate 13 so that the light extracting structure can be improved.

The first electrode 10a may be disposed on the undoped GaN layer 13 and the second electrode may be disposed below the light emitting structure. The ohmic layer 18a, the reflective layer 18b, the bonding layer 18c And the conductive supporting substrate 18d may serve as the second electrode.

A passivation layer 19 may be disposed around the light emitting structure. The passivation layer 19 may be made of an insulating material, and the insulating material may be made of a non-conductive oxide or nitride. As an example, the passivation layer 19 may comprise a silicon oxide (SiO ₂ ) layer, an oxynitride layer, and an aluminum oxide layer.

The ohmic layer 18a may be about 200 Angstroms thick. The ohmic layer 18b may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (IZTO), indium aluminum zinc oxide (IAZO), indium gallium zinc oxide (IGZO) ), AZO (aluminum zinc oxide), ATO (antimony tin oxide), GZO (gallium zinc oxide), IZON (IZO nitride), AGZO (Al- Ga ZnO), IGZO , NiO, RuOx / ITO, Ni / IrOx / Au, and Ni / IrOx / Au / ITO, Ag, Ni, Cr, Ti, Al, Rh, Pd, Ir, Sn, In, Ru, Au, and Hf, and is not limited to such a material.

The reflective layer 18b may be composed of a metal layer containing aluminum (Al), silver (Ag), nickel (Ni), platinum (Pt), rhodium (Rh), or an alloy containing Al, Ag, Pt or Rh . Aluminum, silver, or the like can effectively reflect the light generated in the active layer 15, thereby greatly improving the light extraction efficiency of the light emitting device.

The metal support 18d may be made of a metal having a high electrical conductivity and can sufficiently dissipate heat generated during operation of the light emitting device, so that a metal having high thermal conductivity can be used.

The conductive supporting substrate 18d may be formed of a metal or a semiconductor material or the like. And may be formed of a material having high electrical conductivity and high thermal conductivity. For example, a material selected from the group consisting of molybdenum (Mo), silicon (Si), tungsten (W), copper (Cu) and aluminum (Al) (Cu-W), a carrier wafer (e.g., GaN, Si, Ge, GaAs, ZnO, SiGe, SiC, SiGe, Ga ₂ O _3, etc.) And the like.

The conductive supporting substrate 18d may have a mechanical strength enough to separate into separate chips through a scribing process and a breaking process without causing warping of the entire nitride semiconductor.

The bonding layer 18c joins the reflective layer 18b and the conductive supporting substrate 18d and is formed of a metal such as gold (Au), tin (Sn), indium (In), aluminum (Al), silicon (Si) , Nickel (Ni), and copper (Cu), or an alloy thereof.

The ohmic layer 18a and the reflective layer 18b may be formed by a sputtering method or an electron beam evaporation method and the conductive supporting substrate 18d may be formed by an electrochemical metal deposition method or a bonding method using an eutectic metal , A separate bonding layer 18c can be formed.

The light emitting device 10 may be arranged in a flip chip type in addition to the horizontal light emitting device or the vertical light emitting device.

The first electrode 10a and the second electrode 10b of the light emitting element 10 may be electrically connected to the two bonding pads 250a and 250b and the wires 240a and 240b on the submount 250, The two bonding pads 250a and 250b on the submount 250 may be electrically connected to the two electrode pads 230a and 230b and the wires 245a and 245b, respectively, disposed on the bottom surface of the cavity. The electrode pads 230a and 230b and the bonding pads 250a and 250b may be made of an inorganic material such as Au.

The wires 240a, 240b, 245a and 245b described above are made of an inorganic material such as Au and can have a diameter of 1 to 1.5 mil. If they are too thin, they may be broken or damaged. Blocking or absorption. Here, one mil is about 1/40 millimeter.

In FIG. 2, the inorganic paste layer 220 may be formed of an inorganic material without containing an organic substance such as a carbon compound, more specifically, may include a conductive or non-conductive inorganic material. In particular, at least one of Au, Ag, and Sn . &Lt; / RTI &gt;

When the light in the ultraviolet (UV) wavelength region is emitted from the light emitting element 10, since the inorganic substance in the inorganic paste layer 220 does not react with UV due to UV, the inorganic paste layer 220 is not discolored, It may not be.

 The molding portion including the fluorescent material may be disposed inside the cavity surrounding the light emitting element 10 and the wires 240a, 240b, 245a, and 245b, but may be filled with air or may be in a vacuum state.

A cover layer 290 may be disposed on the ceramic layer 210d disposed on the uppermost stage in FIG. 2, and a lens 300 may be disposed on the cover layer 290.

The cover layer 290 may be made of translucent glass and the cover layer 290 and the ceramic layer 210d may be combined with an inorganic paste layer 290a. The composition of the inorganic paste layer 290a is the same as that of the inorganic paste Layer 220 may be the same.

As another example, the cover layer 290 and the ceramic layer 210d may be fixed by a method such as Eutectic Bonding or Welding to seal the inside of the cavity.

The lens 30 is disposed at the top of the package body, and may be made of silicon, epoxy, or the like, but may be made of an inorganic material.

The inorganic paste layer 290a may be formed of only an inorganic material without containing an organic substance such as a carbon compound, more specifically, may include a conductive or nonconductive inorganic material, and may include at least one of Au, Ag, and Sn . Therefore, when the light in the ultraviolet (UV) wavelength region is emitted from the light emitting element 10, the inorganic substance in the inorganic paste layer 290a does not react with UV due to UV, so that the inorganic paste layer is not discolored and the bonding force is not weakened It may not be.

4A is a cross-sectional view of the lens of FIGS. 2A-2C, and FIG. 4B is a perspective view of the lens of FIGS. 2A-2C.

4A and 4B, in the lens 300, the light incident portion in the direction of the light emitting element may have a flat surface, the surface of the light output portion in the direction opposite to the light emitting element has one inflection point, Conical shape.

The surface of the light output portion of the lens 300 may be symmetrical about the inflection point as shown in the figure. The radius of curvature of the surface of the lens 300 is set such that the light emitted from the lens 300 converges at one point .

5A is an illuminance distribution of light emitted in an embodiment of the light emitting device package, and FIG. 5B is an illuminated distribution of light emitted in an embodiment of the light emitting device package.

FIG. 5A is a diagram illustrating the light intensity distribution emitted from the light emitting device package at the top of the light emitting device package. FIG. 5B is a diagram illustrating a directivity distribution of light emitted from the light emitting device package, wherein the vertical axis represents a light directivity distribution, the horizontal axis represents a position in the light emitting device package, Is the center of the light emitting device package and the right side is the other end of the light emitting device package.

As shown in FIGS. 5A and 5B, the light emitted from the light emitting device package according to the embodiment converges in a region corresponding to the center of the light emitting device package, and is symmetric with respect to the center corresponding to the above- .

The light emitting device package shown in FIG. 2B is similar to the embodiment shown in FIG. 2A except that the cover layer is omitted and the lens 300 is disposed in contact with the uppermost ceramic layer 210d of the package body. At this time, the lens 300 may be coupled to the ceramic layer 210d through the inorganic paste layer 290a.

The light emitting device package shown in FIG. 2C is similar to the embodiment shown in FIG. 2B except that a lead 310 is disposed on the uppermost ceramic layer 210d of the package body, and the lens 300 is fixed do. The lead 310 may be bonded to the ceramic layer 210d through the inorganic paste layer 290a and the lead may be formed such that the first area 310a and the second area 310b are stepped, The height of the area 310a is lower than that of the second area 310b and the edge of the lens 300 may be disposed in the first area 301a.

The light emitting device packages according to the above-described embodiments may converge light in a region corresponding to the center of the light emitting device package so that the light emitted from the light emitting device is symmetric with respect to the center corresponding to the center.

The light emitting device packages may be mounted on one or a plurality of light emitting devices according to the above-described embodiments, but the present invention is not limited thereto.

A plurality of light emitting device packages according to the embodiments may be arrayed on a substrate, and may be implemented as a display device including a light emitting device package, a sterilizing device, and a lighting device. Hereinafter, a sterilizing device and a lighting device in which the above-described light emitting device package is disposed will be described.

6 is a view showing an embodiment of a sterilizing apparatus in which a light emitting element is disposed.

6, the sterilizing apparatus 500 includes a light emitting module part 510 mounted on one surface of a housing 501, diffusive reflection members 530a and 530b for diffusing light of emitted deep ultraviolet wavelength band, And a power supply unit 520 for supplying available power required by the light emitting module unit 510.

The housing 501 may have a rectangular structure and may be formed as a unitary or compact structure including both the light emitting module unit 510 and the diffusive reflective members 530a and 530b and the power supply unit 520. [ In addition, the housing 501 may have a material and shape effective for discharging the heat generated inside the sterilizing apparatus 500 to the outside. For example, the material of the housing 501 may be made of any one of Al, Cu, and alloys thereof. Therefore, the heat transfer efficiency with the outside air of the housing 501 is improved, and the heat radiation characteristic can be improved.

Alternatively, the housing 501 may have a distinctive external surface shape. For example, the housing 501 may have an external surface shape that is protruded, for example, in a corrugation or a mesh or an unspecified concavo-convex shape. Accordingly, the heat transfer efficiency with the outside air of the housing 501 is further improved, and the heat radiation characteristic can be improved.

On the other hand, attachment plates 550 may be disposed on both ends of the housing 501. The attachment plate 550 refers to the absence of a bracket function used to lock and fix the housing 501 to the entire equipment as illustrated in Fig. The attachment plate 550 may protrude from both ends of the housing 501 in one direction. Here, the one direction may be an inner direction of the housing 501 in which deep ultraviolet rays are emitted and diffuse reflection occurs.

Thus, the attachment plate 550 provided on both ends from the housing 501 provides a fixing area with the entire facility apparatus, so that the housing 501 can be more effectively fixedly installed.

The attachment plate 550 may take any of the form of a screw fastening means, a rivet fastening means, an adhesive means, and an attaching / detaching means, and the manner of these various fastening means is obvious at the level of those skilled in the art. do.

On the other hand, the light emitting module unit 510 is disposed on one surface of the housing 501. The light emitting module unit 510 emits ultraviolet rays to sterilize microorganisms in the air. To this end, the light emitting module unit 510 includes a substrate 512 and a plurality of light emitting device packages 200 mounted on the substrate 512. In the light emitting device package 200, as described above, light emitted from the light emitting device converges to a region corresponding to the center of the light emitting device package, so that the light emitting device package 200 can be symmetric with respect to the center corresponding to the above- have.

The substrate 512 is arranged in a single row along the inner surface of the housing 501 and may be a PCB including a circuit pattern (not shown). However, the substrate 512 may include not only a general PCB but also a metal core PCB (MCPCB), a flexible PCB, and the like, but the present invention is not limited thereto.

Next, the diffuse reflection members 530a and 530b refer to a reflection plate type member formed to forcibly diffuse the deep ultraviolet rays emitted from the light emitting module unit 510 described above. The front surface shape and the arrangement shape of the diffusely reflecting reflection members 530a and 530b may have various shapes. (For example, a radius of curvature) of the diffusive reflection members 530a and 530b is slightly changed, the diffused deep ultraviolet rays are irradiated to overlap with each other to increase the irradiation intensity, .

The power supply unit 520 receives power and supplies necessary power to the light emitting module unit 510. The power supply unit 520 may be disposed in the housing 501 described above. 7, the power supply unit 520 may be disposed on the inner wall of the spacing space between the diffusive reflective members 530a and 530b and the light emitting module unit 510. [ A power connection unit 540 for electrically connecting the external power supply to the power supply unit 520 may be further disposed.

As illustrated in FIG. 6, the power connection 540 may be in the form of a surface, but may have the form of a socket or cable slot through which an external power cable (not shown) may be electrically connected. Also, the power cable has a flexible extension structure and can be easily connected to an external power source.

7 is a view showing an embodiment of a lighting device in which a light emitting element is disposed.

The lighting apparatus according to the present embodiment may include a cover 1100, a light source module 1200, a heat discharger 1400, a power supply unit 1600, an inner case 1700, and a socket 1800. In addition, the illumination device according to the embodiment may further include at least one of the member 1300 and the holder 1500, and the light source module 1200 may include the light emitting device package according to the above-described embodiments As described above, as described above, the light emitted from the light emitting device converges to a region corresponding to the center of the light emitting device package, so that the light is symmetric about the center corresponding to the center as described above.

The cover 1100 may have a shape of a bulb or a hemisphere and may be provided in a shape in which the hollow is hollow and a part is opened. The cover 1100 may be optically coupled to the light source module 1200. For example, the cover 1100 can diffuse, scatter, or excite light provided from the light source module 1200. The cover 1100 may be a kind of optical member. The cover 1100 may be coupled to the heat discharging body 1400. The cover 1100 may have an engaging portion that engages with the heat discharging body 1400.

The inner surface of the cover 1100 may be coated with a milky white paint. Milky white paints may contain a diffusing agent to diffuse light. The surface roughness of the inner surface of the cover 1100 may be formed larger than the surface roughness of the outer surface of the cover 1100. This is for sufficiently diffusing and diffusing light from the light source module 1200 and emitting it to the outside.

The cover 1100 may be made of glass, plastic, polypropylene (PP), polyethylene (PE), polycarbonate (PC), or the like. Here, polycarbonate is excellent in light resistance, heat resistance and strength. The cover 1100 may be transparent so that the light source module 1200 is visible from the outside, and may be opaque. The cover 1100 may be formed by blow molding.

The light source module 1200 may be disposed on one side of the heat discharger 1400. Accordingly, the heat from the light source module 1200 is conducted to the heat discharging body 1400. The light source module 1200 may include a light emitting device package 1210, a connection plate 1230, and a connector 1250.

The member 1300 is disposed on the upper surface of the heat discharging body 1400 and has guide grooves 1310 into which the plurality of light emitting device packages 1210 and the connector 1250 are inserted. The guide groove 1310 corresponds to the substrate of the light emitting device package 1210 and the connector 1250.

The surface of the member 1300 may be coated or coated with a light reflecting material. For example, the surface of the member 1300 may be coated or coated with a white paint. The member 1300 reflects the light reflected by the inner surface of the cover 1100 and returns toward the light source module 1200 toward the cover 1100. Therefore, the light efficiency of the illumination device according to the embodiment can be improved.

The member 1300 may be made of an insulating material, for example. The connection plate 1230 of the light source module 1200 may include an electrically conductive material. Therefore, electrical contact can be made between the heat discharging body 1400 and the connecting plate 1230. The member 1300 may be made of an insulating material to prevent an electrical short between the connection plate 1230 and the heat discharger 1400. The heat discharger 1400 receives heat from the light source module 1200 and heat from the power supply unit 1600 to dissipate heat.

The holder 1500 closes the receiving groove 1719 of the insulating portion 1710 of the inner case 1700. Therefore, the power supply unit 1600 housed in the insulating portion 1710 of the inner case 1700 is sealed. The holder 1500 has a guide protrusion 1510. The guide protrusion 1510 has a hole through which the projection 1610 of the power supply unit 1600 passes.

The power supply unit 1600 processes or converts an electric signal provided from the outside and provides the electric signal to the light source module 1200. The power supply unit 1600 is housed in the receiving groove 1719 of the inner case 1700 and is sealed inside the inner case 1700 by the holder 1500. The power supply unit 1600 may include a protrusion 1610, a guide 1630, a base 1650, and an extension 1670.

The guide portion 1630 has a shape protruding outward from one side of the base 1650. The guide portion 1630 may be inserted into the holder 1500. A plurality of components may be disposed on one side of the base 1650. The plurality of components may include, for example, a DC converter for converting an AC power supplied from an external power source to a DC power source, a driving chip for controlling driving of the light source module 1200, an ESD (ElectroStatic discharge) protective device, and the like, but the present invention is not limited thereto.

The extension 1670 has a shape protruding outward from the other side of the base 1650. The extension portion 1670 is inserted into the connection portion 1750 of the inner case 1700 and receives an external electrical signal. For example, the extension portion 1670 may be provided to be equal to or smaller than the width of the connection portion 1750 of the inner case 1700. One end of each of the positive wire and the negative wire is electrically connected to the extension portion 1670 and the other end of the positive wire and the negative wire are electrically connected to the socket 1800 .

The inner case 1700 may include a molding part together with the power supply unit 1600 in the inner case 1700. The molding part is a hardened portion of the molding liquid so that the power supply providing part 1600 can be fixed inside the inner case 1700.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood 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.

70: electrode pad 80: via hole electrode
100, 200: light emitting device package 110a, 110b, 110c: package body
130, 230: heat dissipation unit 140, 240a, 240b:
145, 245a, 245b: wire 150, 250: molding part
151, 152: Third electrode pattern 160, 260: Phosphor
210a, 210b, 210c, 210d: a first ceramic layer
220: third ceramic layer 270: crack preventing portion
281a to 284a: First electrode patterns 281b to 284b:
285a: first electrode pad 285b: second electrode pad
286a to 286d: conductive adhesive layer
291a to 294a, 291b to 294b:

Claims (6)

A package body including at least one ceramic layer and having a cavity;
A light emitting element disposed on a bottom surface of the cavity; And
And a lens disposed at an uppermost portion of the package body,
Wherein the surface of the lens has at least one inflection point. The method according to claim 1,
Wherein the surface of the light output portion in the direction opposite to the light emitting element has the inflection point. The method according to claim 1,
Wherein the lens has a flat surface of a light incidence portion facing the light emitting element. The method according to claim 1,
Wherein the surface of the lens is symmetrical about the inflection point. The method according to claim 1,
And a cover layer disposed on the top of the ceramic layer, wherein the lens is disposed on the cover layer. 6. The method according to any one of claims 1 to 5,
Wherein a radius of curvature of a surface of the lens is arranged such that light emitted from the lens converges in one area.

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