KR20150083248A - Package for light emitting device - Google Patents

Abstract

A light emitting device package according to an embodiment includes: a substrate; A first light emitting device and a second light emitting device disposed on the substrate; A first lighting circuit for controlling the first light emitting element; A second lighting circuit for controlling the second light emitting element; And a lens disposed on the first and second light emitting elements, wherein the first turn-on circuit and the second turn-on circuit operate independently of each other, and the lens is disposed on the first and second light emitting elements, 1 lens and a second lens disposed on the second light emitting element, wherein the radius of curvature of the first lens and the radius of curvature of the second lens are different from each other.

Description

[0001] PACKAGE FOR LIGHT EMITTING DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light emitting device package, and more particularly to a light emitting device package capable of changing and adjusting the angle of a beam irradiated by control of a lighting circuit.

Light emitting diodes (LEDs) are a type of semiconductor devices that convert electrical energy into light. The light emitting diode has advantages of low power consumption, semi-permanent lifetime, fast response speed, safety, and environmental friendliness compared with conventional light sources such as fluorescent lamps and incandescent lamps. 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 used in indoor / outdoor, a liquid crystal display, a display board, and a streetlight. When the forward voltage is applied to the light emitting diode, the electrons of the n layer and the holes of the p layer are combined to generate light energy corresponding to the energy gap between the conduction band and the valance band.

The criteria for determining the characteristics of the light-emitting diode device include color, brightness, and brightness, and the characteristics of the light-emitting diode device are determined primarily by the compound semiconductor material used in the light-emitting diode device. But also by the package structure for mounting the chip, so that the package structure has attracted much attention.

FIG. 1 is a side sectional view showing a conventional light emitting device package 10A including a lens, and FIG. 2 is a side sectional view showing a conventional light emitting device package 10B including a molding part.

In the light emitting device package 10A of Fig. 1, the light emitting element 12 is disposed on the substrate 16, and the lead frames 14 and 15 are formed on the substrate 16. Electrodes (not shown) of the light emitting element 12 are connected to the lead frames 14 and 15 by wire bonding. On the light emitting element 12, a lens 11 is provided. The light emitting device package 10B of Fig. 2 includes a substrate 16 and a light emitting element 12 disposed on the substrate 16. Fig. 2 shows a molding unit 17 formed in the center hole of the body 18 for protecting the light emitting device 12 and includes a body 18 formed to surround the light emitting device 12 on the substrate 16, . A diffusion agent may be contained in the molding part 17. In addition, a fluorescent material may be further included in the molding part 17. However, since the light emitted from the light emitting device 12 is radiated to the outside of the light emitting device packages 10A and 10B along a certain optical path, the light emitting device packages 10A and 10B disclosed in FIGS. 1 and 2, And the function for changing or adjusting the irradiation beam angle is not provided in the light emitting element 12, so that the light distribution angle is narrow and it can not be changed.

An embodiment of the present invention is to provide a light emitting device package capable of switching the angle of an illumination beam and controlling an illumination area.

It is also an object of the present invention to provide a light emitting device package capable of producing and selecting an atmosphere of an illumination space according to a situation.

It is also an object of the present invention to provide a light emitting device package which can easily change the angle of an illumination beam by means of a lighting switch, since the light distribution can be switched by switching the lighting circuit.

It is another object of the present invention to provide a light emitting device package that contributes to miniaturization and high performance of a lighting apparatus without mechanical switching or lens replacement.

A light emitting device package according to an embodiment includes: a substrate; A first light emitting device and a second light emitting device disposed on the substrate; A first lighting circuit for controlling the first light emitting element; A second lighting circuit for controlling the second light emitting element; And a lens disposed on the first and second light emitting elements, wherein the first turn-on circuit and the second turn-on circuit operate independently of each other, and the lens is disposed on the first and second light emitting elements, 1 lens and a second lens disposed on the second light emitting element, wherein the radius of curvature of the first lens and the radius of curvature of the second lens are different from each other.

The light emitting device package according to the embodiment can control the lighting angle by switching the beam angle by controlling the lighting circuit.

Further, the light emitting device package according to the embodiment can produce and select an illumination space atmosphere depending on the situation.

Further, in the light emitting device package according to the embodiment, the angle of the illumination beam can be simply changed by the lighting switch.

Further, the light emitting device package according to the embodiment is capable of downsizing and high-performance lighting apparatus.

1 is a side sectional view showing a conventional light emitting device package including a lens.
2 is a side sectional view showing a conventional light emitting device package including a molding part.
Fig. 3 is a view showing the distribution of the orientation angles of the light emitting device package according to the embodiment.
FIG. 4A is a side sectional view showing the light emitting device package according to the first embodiment in the first operation mode, and FIG. 4B is a perspective view showing a plurality of light emitting elements in the first operation mode.
FIG. 5A is a side sectional view showing a light emitting device package according to the first embodiment in the second operation mode, and FIG. 5B is a perspective view showing a plurality of light emitting elements in the second operation mode.
6 is a side sectional view showing a lens of the light emitting device package according to the second embodiment.
7 is a side sectional view showing a lens of the light emitting device package according to the third embodiment.
8 is a top view showing the arrangement of a plurality of light emitting elements of the light emitting device package according to the third embodiment.
9 is a result of light distribution simulation of the light emitting device package according to the third embodiment in the first and second operation modes.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention which can specifically realize the above object will be described with reference to the accompanying drawings.

In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure is formed "on" or "under" a substrate, each layer The terms " on "and " under " encompass both being formed" directly "or" indirectly " In addition, the criteria for above or below each layer will be described with reference to the drawings.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

FIG. 4A is a side sectional view showing the light emitting device package 100 according to the first embodiment in the first operation mode, and FIG. 4B is a perspective view showing a plurality of light emitting elements in the first operation mode.

FIG. 5A is a side sectional view showing a light emitting device package 100 according to the first embodiment in the second operation mode, and FIG. 5B is a perspective view showing a plurality of light emitting elements in the second operation mode.

4A and FIG. 5A, the light emitting device package 100 according to the first embodiment may include a substrate 160, a light emitting device 120, and a lens 110.

The material of the substrate 160 may be formed of an insulating or conductive material, and may include a single layer or a multi-layer structure. The substrate 160 may be made of a resin material such as polyphthalamide (PPA), silicon (Al), aluminum nitride (AlN), AlOx, photo sensitive glass ), Polyamide 9T (PA9T), syndiotactic polystyrene (SPS), metal material, sapphire (Al2O3), beryllium oxide (BeO), and printed circuit board (PCB). The substrate 160 may be formed by injection molding, etching, or the like, but is not limited thereto.

An electrode (not shown) is disposed on the substrate 160 to be electrically connected to the positive and negative terminals of the plurality of light emitting devices 120 to supply power to the plurality of light emitting devices 120 can do. The electrode may be formed by a printing technique or by using an adhesive. The electrode may include a metal material having excellent conductivity, for example, copper or aluminum, and the electrode connected to the positive electrode terminal and the electrode connected to the negative electrode terminal may be mutually insulated. Although not shown, wires may be connected to the plurality of light emitting devices 120, respectively. The plurality of light emitting devices 120 may be connected to the first electrode or the second electrode through wires, respectively. The plurality of light emitting devices 120 may be electrically connected to the electrodes without using wires, but the present invention is not limited thereto.

A plurality of light emitting devices 120 may be disposed on the substrate 160. The light emitting device 120 may include a light emitting structure including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer. For example, the light emitting structure may include an active layer disposed between the first conductive semiconductor layer and the second conductive semiconductor layer.

The first conductive semiconductor layer may include an n-type semiconductor layer and may be selected from among GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, AlGaInP, An n-type dopant such as Se or Te can be doped.

In the active layer, electrons (or holes) injected through the first conductive type semiconductor layer and holes (or electrons) injected through the second conductive type semiconductor layer meet with each other to form an energy band corresponding to the formation material of the active layer, Is a layer which emits light due to a difference in band gap of the light emitting layer. The active layer may be formed of any one of a single well structure, a multi-well structure, a quantum dot structure, or a quantum wire structure, but is not limited thereto.

The second conductivity type semiconductor layer may be a p-type semiconductor layer and may be selected from GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, AlGaInP, A p-type dopant such as Sr, Ba or the like may be doped.

Meanwhile, the first conductivity type semiconductor layer may include an n-type semiconductor layer and the second conductivity type semiconductor layer may include a p-type semiconductor layer. Further, a semiconductor layer including an n-type or p-type semiconductor layer may be further formed under the second conductive type semiconductor layer. Accordingly, the light emitting structure may include at least one of an n-p junction structure, a p-n junction structure, an n-p-n junction structure, and a p-n-p junction structure. The light emitting device 120 can selectively emit light in the range of visible light band to ultraviolet light band, and can emit light having a unique color of the semiconductor material.

A wavelength conversion layer (not shown) may be disposed on the plurality of light emitting devices 120. The wavelength conversion layer may convert light into a light having a second wavelength that is longer than the light having the first wavelength emitted from the plurality of light emitting devices 120, for example, to emit light. The wavelength conversion layer may include at least one of a blue phosphor, a red phosphor, a green phosphor, and a yellow phosphor. Blue phosphor Sr ₂ MgSi ₂ O _7: material of ^{_{Eu 2 +, BaMgAl 10 O 17}} : Eu (Mn), Sr 5 Ba 3 MgSi 2 O 8: Eu 2 +, Sr 2 P 2 O 7: Eu 2+, _{SrSiAl 2 O 3 N 2: Eu} 2 +, (Ba 1 - x Sr x) SiO 4: Eu 2 +, (Sr, Ca, Ba, Mg) 10 (PO 4) 6 Cl 2: Eu 2 +, CaMgSi 2 O ₆ : Eu ²⁺ . Red phosphor ^{_{La 2 O 2 S: Eu 3}} +, Y 2 O 2 S: Eu 3+, Y 2 O 3: Eu 3 + (Bi 3 +), CaS: Eu 2 +, K 5 (WO 4) 6.25 : Eu ^{3 +} 2.5, and LiLa ₂ O ₂ BO ₃ : Eu ^{3 +} . Green phosphor ^{ZnS: Cu + (Al 3 +} ), SrGa 2 S 4: Eu 2 +, CaMgSi 2 O 7: Eu 2 +, Ca 8 Mg (SiO 4) Cl 2: Eu 2+ (Mn 2+), ( Ba, Sr) ₂ SiO _4: may include at least one of Eu _{2 +.} The yellow phosphor may include at least one of Y ₃ Al ₅ O ₁₂ : Ce ^{3 +} , and Sr ₂ SiO ₄ : Eu ^{2 +} .

The plurality of light emitting devices 120 may include an inner light emitting device 122 and an outer light emitting device 121, and may be electrically connected to each other.

In the light emitting device package according to the first embodiment, the inner light emitting element 122 and the outer light emitting element 121 may be a single light emitting element, while the inner light emitting element 122 and the outer light emitting element 121 are plural.

The outer light emitting element 121 is disposed so as to surround the inner light emitting element 122, and the inner and outer boundaries may be changed according to the convenience of the user and the intended use.

The inner light emitting element 122 and the outer light emitting element 121 can emit light of the same wavelength and emit light of other wavelengths. When a plurality of inner light emitting devices 122 are arranged, light of the same or different wavelengths may be emitted, and the same may be applied to the case of the outer light emitting device 121.

The inner light emitting element 122 and the outer light emitting element 121 are connected to different lighting circuits respectively. That is, the inner light emitting element 122 may be connected to the first lighting circuit, and the outer light emitting element 121 may be connected to the second lighting circuit and operated independently of each other. Therefore, when one of the inner light emitting element 122 and the outer light emitting element 121 is turned on, the other one may be turned off. That is, they can operate mutually exclusive. Specifically, when the inner light emitting element 122 is turned on, the outer light emitting element 121 can be turned off. Or when the inner light emitting element 122 is turned off, the outer light emitting element 121 may be turned on. Or the inner light emitting element 122 and the outer light emitting element 121 may be turned on or off at the same time.

A lighting circuit for separately controlling lighting and lighting of some light emitting elements can be connected even in a plurality of inner light emitting elements 122 by the additional configuration of the lighting circuit, have. For example, as shown in FIG. 4B, a plurality of inner light emitting devices 122 are arranged in a square manner, and four inner light emitting devices and twelve light emitting devices arranged to surround the four inner light emitting devices 122 can operate independently have. Or eight light emitting elements disposed on the right side with respect to the longitudinal center axis and eight light emitting elements disposed on the left side can operate independently. This is an example, and the light emitting element that operates independently by the arrangement of the light emitting elements and the configuration of the circuit may be further subdivided.

A lens 110 for distributing light emitted from the light emitting device 120 at a predetermined angle may be disposed on the plurality of light emitting devices 120.

The lens 110 may include a transparent resin material such as epoxy or silicon, or may be formed of a glass material.

The upper surface (or light emitting surface) of the lens 110 may be formed convexly or concavely. When the upper surface of the lens 110 is convex or concave, the light generated by the light emitting device 120 is refracted at a predetermined angle while passing through the lens 110, Can be implemented.

The lens 110 may include an inner lens 112 corresponding to the inner light emitting element 122 and an outer lens 111 corresponding to the outer light emitting element 121. [

The inner lens 112 and the outer lens 111 may have different shapes from each other. This allows various adjustment of the beam angle. For example, the curvature radius of the upper surface (or the light exit surface) of the inner lens 112 and the curvature radius of the upper surface (or the light exit surface) of the outer lens 111 may be different from each other, have.

The bottom surface (or light incidence surface) of the inner lens 112 and the outer lens 111 may be flat. The bottom surface of the inner lens 112 may be disposed on the same plane as the bottom surface of the outer lens 111. [

The inner lens 112 may be disposed on the inner light emitting element 122 and the outer lens 111 may be disposed on the outer light emitting element 121. [

The outer lens 111 may be disposed so as to surround the inner lens 112. For example, the outer lens 111 may be arranged to surround the side of the inner lens 112.

The outer lens 111 may extend outward from the side of the inner lens 112. The contact point where the inner lens 112 and the outer lens 111 are connected to each other on the upper surface (or the light incident surface) of the lens 110 does not contact the bottom surface of the lens 110, Or may be spaced apart from the bottom surface of the lens 110 by a predetermined distance.

The thickness of the inner lens 112 may be thicker than the thickness of the outer lens 111. [ Here, the thickness of the inner lens 112 and the outer lens 111 may be a height from the bottom of the lens 110. The thickness of the inner lens 112 and the outer lens 111 may be equal to each other or the thickness of the outer lens 111 may be thicker than the thickness of the inner lens 111,

Hereinafter, the light distribution in each operation mode will be described with reference to FIGS. 4A and 5A. As shown in Fig. 4A, in the first operation mode, the inner light emitting element 122 is turned on and the outer light emitting element 121 is turned off. Accordingly, only the inner light emitting element 122 is turned on, and the light from the inner light emitting element 122 is incident on the bottom face (or the light incident face) of the inner lens 112.

As shown in Fig. 5A, in the second operation mode, the inner light emitting element 122 is turned off and the outer light emitting element 121 is turned on. Accordingly, only the outer light emitting element 121 is turned on, and the light from the outer light emitting element 121 is incident on the bottom surface of the outer lens 111.

Since the curvature radii of the inner lens 112 and the outer lens 111 of the lens 110 shown in Figs. 4A and 5A are different from each other, the light distribution ranges of light emitted in the first and second operation modes are different from each other .

Therefore, in the light emitting device package according to the first embodiment, different light distribution angles can be switched by a lighting circuit for individually controlling the lighting of the inner light emitting element and the outer light emitting element, There is a possible advantage.

On the other hand, in the lens 110 shown in Figs. 4A to 5A, in the first operation mode, a part of light emitted from the inner light emitting element 122 is incident on the outer lens 111, not the inner lens 112, And in the second mode of operation, some of the light emitted from the outer light emitting element 121 may be incident on the inner lens 112, rather than the outer lens 111. In this case, there is a problem that the lens 110 shown in FIGS. 4A and 5A can not accurately implement different light distribution angles desired by the designer. Therefore, another lens capable of solving such a problem will be described in detail with reference to Fig.

6 is a side sectional view showing a lens of the light emitting device package according to the second embodiment.

6, the lens 110 'of the light emitting device package according to the second embodiment includes an outer lens 111' corresponding to the inner light emitting element 122 and an inner lens 111 'corresponding to the outer light emitting element 121 112 ').

The inner lens 112 'is disposed on the inner light emitting element 122 and the outer lens 111' is disposed on the outer light emitting element 121.

The outer lens 111 'is arranged so as to surround the inner lens 112'. Specifically, the outer lens 111 'may be arranged to surround the side of the inner lens 112'.

The bottom surface (or light incidence surface) of the inner lens 112 'and the outer lens 111' may be flat. The bottom surface (or light incidence surface) of the inner lens 112 'and the bottom surface (or light incidence surface) of the outer lens 111' may be arranged on the same plane.

The upper surface (or light output surface) of the inner lens 112 'and the upper surface (or light output surface) of the outer lens 111' may be curved surfaces. Here, the radius of curvature of the inner lens 112 'may be smaller than the radius of curvature of the outer lens 111'.

The edge (or outer circumference) of the upper surface of the inner lens 112 'can contact the bottom surface (or the light incident surface) of the inner lens 112', and the edge (Or light incidence plane) of the lens 111 '.

The maximum thickness of the inner lens 112 'may be thicker than the maximum thickness of the outer lens 111'. Here, the maximum thickness of the inner lens 112 'and the outer lens 111' may be the maximum height based on the bottom surface (or the light incidence surface) of each lens.

Since the lens 110 'having such a structure is structurally separated from the inner lens 112' and the outer lens 111 ', the light emitted from the inner light emitting element 122 is transmitted to the outer lens 111' And it is difficult for the light emitted from the outer light emitting element 121 to be incident on the inner lens 112 '. Therefore, the problem of the lens 110 shown in Figs. 4A to 5A can be solved.

7 is a side sectional view showing a lens of the light emitting device package according to the third embodiment. 8 is a top view showing the arrangement of a plurality of light emitting elements of the light emitting device package according to the third embodiment.

 7 and 8, the plurality of light emitting elements includes an inner light emitting element 122 and an outer light emitting element 121 arranged so as to surround the inner light emitting element 122. As shown in FIG.

A lens 110 '' may be disposed on the inner light emitting element 122 and the outer light emitting element 121.

The lens 110 '' includes an inner lens 112 '' corresponding to the inner light emitting element 122 and an outer lens 111 '' corresponding to the outer light emitting element 121.

The inner lens 112 '' is disposed on the inner light emitting element 122 and the outer lens 111 '' is disposed on the outer light emitting element 121.

The outer lens 111 '' is arranged to surround the inner lens 112 ''. The outer lens 111 '' may extend outwardly from the side of the inner lens 112 ''.

The thickness of the inner lens 112 " may be thicker than the thickness of the outer lens 111 ". Here, the thickness of the inner lens 112 '' and the outer lens 111 '' may be a height based on the bottom surface (or the light incidence surface) of each lens.

The contact point where the inner lens 112 '' and the outer lens 111 '' are connected to each other on the upper surface (or the light output surface) of the lens 110 '' does not contact the bottom surface 113, Or spaced apart from the bottom surface 113 by a predetermined distance.

The bottom surface (or light incidence surface) of the inner lens 112 '' and the bottom surface (or light incidence surface) of the outer lens 111 'are disposed on the same plane 113.

The radius of curvature of the upper surface (or light exit surface) of the inner lens 112 '' may have a value less than half of the radius of curvature of the upper surface (or light exit surface) of the outer lens 111 ''.

The curvature radius R1 of the upper surface (or light exit surface) of the inner lens 112 '' is larger than half the diameter 1 of the inner lens 112 '' and may be smaller than infinity (( ? 1) / 2? R 1 <?). The closer the R1 is to the half value (? 1) / 2 of the diameter? 1 of the inner lens 112 '', the narrower the light distribution range of the light emitted from the inner lens 112 '' becomes, The light distribution range of the light emitted from the inner lens 112 '' is widened. Here, the reason that R1 does not have an infinite (infinity) value is because if the value of R1 is infinite (∞), the top surface (or light output surface) of the inner lens 112 '' becomes flat.

The curvature radius R2 of the upper surface (or light exit surface) of the outer lens 111 '' is larger than half the width W of the outer lens 111 '' and may be smaller than infinity W / 2? R 2 <?). The closer to the half value W / 2 of the width W of the outer lens 111 '', the narrower the light distribution range of the light emitted from the outer lens 111 '' becomes, The light distribution range of the light emitted from the light source 111 '' is widened. Here, the reason that R2 does not have an infinite (infinity) value is because the upper surface (or light emitting surface) of the outer lens 111 '' becomes flat when R2 is infinite.

The minimum light distribution angle of the inner lens 112 '' may be greater than 40 degrees and the maximum light distribution angle of the inner lens 112 '' may be the light distribution angle of the inner light emitting element 122. The reason why the maximum light distribution angle of the inner lens 112 '' is the light distribution angle of the inner light emitting element 122 is that if the upper surface (or light output surface) of the inner lens 112 '' becomes flat, This is because the light distribution angle of the inner lens 122 &quot; becomes equal to the light distribution angle of the inner light emitting element 122. For example, when the light distribution angle of the inner light emitting element 122 is 60 (degrees), the light distribution range of the inner lens 112 '' may be 40 degrees or more and 60 degrees or less.

The minimum light distribution angle of the outer lens 111 '' may be 45 (°) or more and the maximum light distribution angle of the outer lens 111 '' may be the light distribution angle of the outer light emitting element 121 '. The reason why the maximum light distribution angle of the outer lens 111 '' is the light distribution angle of the outer light emitting element 121 is that when the upper surface (or the light output surface) of the outer lens 111 '' becomes flat, This is because the light distribution angle of the outer lens 121 '' is equal to the light distribution angle of the outer light emitting element 121. For example, when the light distribution angle of the outer light emitting element 121 is 60 (degrees), the light distribution range of the outer lens 111 '' may be 45 degrees or more and 60 degrees or less.

As a specific numerical value of the lens 110 '', the radius R1 of the inner lens 112 '' may be 2.5 mm and the radius R2 of the outer lens 111 '' may be 6.5 mm. In this case, between the boundary surfaces where the curvatures of the inner lens 112 '' and the outer lens 111 '' change from the bottom surface 113 of the lens 110 '' where the light from the plurality of light emitting devices 120 enters, The height t or the thickness t of the outer lens 111 &quot; may have a value of 0.5 mm. In this case, the total diameter 2 of the bottom surface 113 of the lens 110 &quot; may be 10 mm, and the diameter 1 of the inner lens 112 &quot; may be 5 mm. The refractive indices of the inner lens 112 '' and the outer lens 111 '' may have a value of 1.5.

9 is a result of light distribution simulation for each of the light emitting device packages according to the third embodiment in the first and second operation modes.

As shown in Fig. 9, the angle? 1 between the peak-to-peak, which is the first operation mode, that is, the light distribution when the inner light emitting element 122 is ON only, Compared to the mode, it is a relatively narrow light distribution.

In addition, it can be seen that the second operation mode, that is, the diffusing angle when only the outer light emitting element 121 is turned on is 54 degrees, and the light distribution is relatively wide angle as compared with the first operation mode (see FIG. That is, it can be confirmed that the light distribution angle of the light emitting device package can be changed to a wide angle or a narrow angle by switching of the lighting circuit.

The light emitting device package according to various embodiments of the present invention may be applied to various types of lighting devices such as LED devices, residential lights (e.g., downlights, ceiling lights, pendant lights, desk lights, (For example, street lights, street lights, stadium lights, high ceiling lights, pearlite, floodlights, etc.), lighting for household appliances, automobiles But are not limited to, lighting, aerospace lighting, marine lighting, medical lighting, lightening ornamental lighting, and agriculture and forestry lighting.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be appreciated that many variations and applications not illustrated 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, 100 ', 100'': Light emitting device package
110, 110 ', 110'': lens
120: Light emitting element
160: substrate

Claims (9)

Board;
A first light emitting device and a second light emitting device disposed on the substrate;
A first lighting circuit for controlling the first light emitting element;
A second lighting circuit for controlling the second light emitting element; And
And a lens disposed on the first and second light emitting elements,
The first lighting circuit and the second lighting circuit operate independently of each other,
Wherein the lens includes a first lens disposed on the first light emitting element and a second lens disposed on the second light emitting element,
Wherein a radius of curvature of the first lens and a radius of curvature of the second lens are different from each other. The method according to claim 1,
Wherein the second light emitting element is a plurality of light emitting elements,
Wherein the plurality of second light emitting elements are arranged to surround the first light emitting element,
The second lens is disposed so as to surround the first lens,
Wherein the curvature radius of the first lens is smaller than the curvature radius of the second lens. 3. The method of claim 2,
And the thickness of the first lens is thicker than the thickness of the second lens. The method according to claim 2 or 3,
And the second lens extends outward from the side of the first lens. The method according to claim 2 or 3,
Wherein a contact point between the upper surface of the first lens and the upper surface of the second lens is disposed on the same plane as the lower surface of the lens. The method according to claim 2 or 3,
Wherein the curvature radius of the first lens is not more than half the curvature radius of the second lens. The method according to claim 2 or 3,
Wherein a radius of curvature of the first lens is larger than a half value of a diameter of the first lens and is smaller than an infinity (?). The method according to claim 2 or 3,
Wherein a radius of curvature of the second lens is larger than a half value of a width of the second lens and is smaller than an infinity (?). The method according to claim 2 or 3,
Wherein a bottom surface of the first lens and a bottom surface of the second lens are disposed on the same plane.

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