KR20130040068A

KR20130040068A - Lighting device

Info

Publication number: KR20130040068A
Application number: KR1020110104826A
Authority: KR
Inventors: 테츠오 아리요시; 박천호; 유병현; 윤지훈
Original assignee: 삼성전자주식회사
Priority date: 2011-10-13
Filing date: 2011-10-13
Publication date: 2013-04-23

Abstract

PURPOSE: A lighting device is provided to broaden a light distributing range by reflecting light emitted from a light emitting device. CONSTITUTION: A reflection part(20) has an outer periphery inclined to a substrate(12). Multiple light emitting devices(C) are arranged on the substrate. The reflection part reflects light emitted from the light emitting device. One between the substrate and the reflection part is positioned in parallel with the center axis of the lighting device. The light emitting device is positioned separated from the center axis of the lighting device.

Description

Lighting device

One embodiment of the present invention relates to a lighting apparatus, and to a lighting apparatus having a large light distribution characteristic.

A light emitting device (LED) refers to a semiconductor device capable of realizing various colors of light by configuring a light emitting source through a PN junction of a compound semiconductor. Recently, blue LEDs and ultraviolet LEDs implemented using nitrides having excellent physical and chemical properties have emerged, and white or other monochromatic light can be produced using blue or ultraviolet LEDs and fluorescent materials, thereby increasing the application range of light emitting devices. ought. LED has long life, small size and light weight, and low voltage driving. In addition, the LED is resistant to shock and vibration, requires no preheating time and complicated driving, and can be packaged in various forms, and thus it can be applied to various applications.

Recently, LED is not only used as a backlight of a display device, but also used as a high-output, high-efficiency light source used in various lighting devices for general lighting, decorative lighting, and local lighting.

However, since the LED is not an element emitting light in all directions of 360 degrees, but an element irradiating light only in front, the lighting apparatus using the LED differs greatly in light distribution characteristics from a conventional light bulb. For this reason, the lighting device using the LED is an obstacle to the spread because the distribution and visibility of the light is significantly different compared to the conventional general light bulb.

The present disclosure provides an illumination device capable of improving an irradiation angle of light emitted from a light source.

A lighting apparatus according to one type of the present invention includes a substrate; A reflector having an outer circumferential surface inclined with respect to the substrate; And a plurality of light emitting elements disposed on the substrate around a lower end of the outer circumferential surface, wherein the reflector reflects light emitted from the plurality of light emitting elements.

In addition, at least one of the substrate, the reflector, and the plurality of light emitting devices may be symmetric with respect to a central axis of the lighting device.

The light emitting devices may be spaced apart from each other at a predetermined distance from a central axis of the lighting device.

The outer circumferential surface may have a smaller cross-sectional area toward the substrate.

In addition, a projection area of the outer circumferential surface onto the substrate may cover the plurality of light emitting devices.

The light emitting device may further include one or more light emitting devices disposed on a central axis of the lighting device.

The reflector may have a narrow inverted pyramidal shell shape below, penetrate the reflector, and a support part on which the at least one light emitting device is disposed.

The height of the support may be greater than or equal to the height of the reflector.

In addition, the support may have a cylindrical shape.

The reflector may have a narrow inverse pyramid shape, and at least one light emitting device may be disposed on an upper surface of the reflector.

In addition, the reflector may be formed of a heat conductive material having a reverse truncated cone shape and a reflective material applied to an outer circumferential surface of the reverse truncated cone shape.

The outer circumferential surface may have a larger cross-sectional area toward the substrate.

In addition, the reflector may have a horn-shaped wide bottom.

The apparatus may further include a body part supporting the substrate and the reflecting part and dissipating heat generated from the plurality of light emitting devices.

The apparatus may further include a connection part connecting the reflection part and the body part.

The connecting portion may have a cylindrical shape.

The lighting apparatus of the present disclosure may expand the light distribution range by reflecting light emitted from the light emitting element.

1 is an exploded perspective view of a lighting apparatus according to an embodiment of the present invention.
FIG. 2 is a front view of the lighting device of FIG. 1.
3 is a cross-sectional view showing an exemplary structure of a light emitting device applied to the present invention.
4 is a cross-sectional view showing another exemplary structure of a light emitting device to which the present invention is applied.
5 is a cross-sectional view showing another exemplary structure of a light emitting device according to the present invention.
6 is a cross-sectional view showing another exemplary structure of a light emitting device according to the present invention.
7 is a diagram illustrating a light distribution curve of the lighting apparatus of FIG. 1.
8 is an exploded perspective view of a lighting apparatus according to another embodiment of the present invention.
9 is a front view of the lighting apparatus of FIG. 8.
10 to 12 are exploded perspective views of a lighting apparatus according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments illustrated below are not intended to limit the scope of the invention, but rather to provide a thorough understanding of the invention to those skilled in the art. In the following drawings, like reference numerals refer to like elements, and the size of each element in the drawings may be exaggerated for clarity and convenience of explanation.

1 is an exploded perspective view of a lighting device 1 according to an embodiment of the present invention, and FIG. 2 is a front view of the lighting device 1 of FIG. 1.

Referring to the drawings, the lighting device 1 is mounted on a first substrate 12, a reflector 20 having an outer circumferential surface inclined with respect to the first substrate 12, and a first substrate 12 around the bottom of the outer circumferential surface. It includes a plurality of light emitting elements (C) disposed.

The first substrate 12 may have a circular flat plate shape or a ring flat plate shape depending on the shape in which the light emitting device C is disposed. The first substrate 12 may be a PCB substrate.

The plurality of light emitting elements C may be disposed symmetrically with respect to the central axis A of the lighting device. The plurality of light emitting elements C are illustrated in a state of being spaced apart from each other by a predetermined distance from the central axis A of the lighting apparatus. In the figure, a state in which a plurality of light emitting elements C is arranged in a ring shape is illustrated. However, the present invention is not limited thereto, and the plurality of light emitting devices C may be disposed in various shapes such as polygons. The plurality of light emitting devices C disposed on the first substrate 12 and the first substrate 12 may be referred to as a first light emitting device unit 10.

The reflecting unit 20 has an outer circumferential surface that reflects light emitted from the first light emitting element unit 10. An outer circumferential surface of the reflector 20 may have a smaller cross-sectional area toward the first substrate 12. For example, the reflector 20 may have a conical or polygonal shell shape having a narrow bottom and an empty internal space. The reflector 20 may be symmetrically disposed with respect to the central axis A of the lighting apparatus. The cross-sectional shape of the reflector 20 may be a circle or a polygon. In addition, in order to reflect the light emitted from the plurality of light emitting devices C as much as possible, the projection area of the outer circumferential surface of the first substrate 12 may cover the plurality of light emitting devices C.

The reflector 20 may be formed using a material having high reflectance. Available materials include high reflectivity white resin, metal and reflective paint. The white resin may be a white foamed PET material, a white POLYCARBONATE material, or the like. The reflectance of such a material is about 97%, and since there is little reflection loss of light, there is little efficiency fall. As the metal, at least one selected from the group consisting of high reflectivity metals such as Ag, Al, Au, Cu, Pd, Pt, Rd and alloys thereof can be used. The reflector 20 may be formed by vapor deposition. Alternatively, as the reflective paint, those containing single or mixed reflective materials such as titanium oxide (TiO ₂ ), zinc oxide (ZnO), calcium carbonate (CaCO ₃ ) having a reflectance of 80 to 90%, and the like may be used. Such a reflective paint can be formed by diluting in a solvent with an adhesive and applying it to a material such as plastic. As a coating method, it can apply | coat using a spray, a roller, etc.

The reflector 20 may improve light distribution characteristics. For example, since light emitted from the first light emitting device unit 10 is reflected by the reflecting unit 20 and is emitted to the side of the lighting apparatus 1 at various angles, light distribution characteristics are improved.

The lighting device 1 may further include a second light emitting device portion 30 including one or more light emitting devices C, which are arranged symmetrically with respect to the central axis A of the lighting device. In the figure, a state in which one light emitting element C is disposed on the central axis A of the lighting apparatus is illustrated. However, the present invention is not limited thereto, and the plurality of light emitting elements C may be disposed symmetrically with respect to the central axis A of the lighting apparatus. In addition, when one light emitting element has sufficient light intensity, one light emitting element may be disposed on the central axis A of the lighting apparatus.

The second light emitting device unit 30 may further include a second substrate 32 on which one or more light emitting devices C are disposed. The second substrate C may have a circular flat plate shape according to the shape in which the light emitting device C is disposed.

The light emitted from the first light emitting element portion 10 is reflected by the reflecting portion 20 and is emitted to the outside. Since the reflecting portion 20 is in the shape of an inverted truncated shell, most of the light emitted from the first light emitting element portion 10 is emitted in the lateral direction of the lighting device 1. Thus, the second light emitting element unit 30 may be disposed on the central axis A of the lighting apparatus so that light is emitted in all directions of the lighting apparatus 1.

In addition, the lighting device 1 supports the first and second first light emitting device units 10 and 30, and radiates heat radiating heat generated from the first and second light emitting device units 10 and 30 ( 40) may be further included. The heat dissipation part 40 may also have a symmetrical structure with respect to the central axis A of the lighting device. The heat dissipation part 40 may include a body part 42 supporting the first light emitting device part 10 and the reflection part 20, and a support part 44 supporting the second light emitting device part 30. The support 44 and the body 42 may be integrally implemented or may be implemented separately.

Body portion 42 may have a cylindrical shape. An upper part of the body part 42 is connected to a lower end of the support part 44, and a lower part of the body part 42 is connected to an external power source for supplying power to a plurality of light emitting devices C (not shown). Can be connected with The inside of the body part 42 includes additional circuit elements necessary for constructing the lighting module, for example, a zener diode as a semiconductor device for preventing damage to the light emitting device C by static electricity, and a semiconductor device for temperature control. Thermistors or the like may be provided. The shape of the body part 42 is illustrated in a cylindrical shape, but this is exemplary, and may be variously modified, such as a polygonal pillar shape. The radius of the body portion 42 may be greater than or equal to the top radius of the reflector 20.

In addition, the side end of the body portion 42 Radiating fins (not shown) arranged radially with respect to the central axis A of the lighting device may be further disposed. The heat dissipation fin may have a rectangular panel shape, and one end thereof may extend from the body portion 42 in the longitudinal direction in contact with the body portion 42. There may be a plurality of heat dissipation fins.

The heat dissipation fins increase the surface area in contact with the air, thereby inducing high-temperature heat transferred from the light emitting device C to the body part 42 to be conducted and released to the outside. Such a radial arrangement has a low density in the open space on all sides outside the dense space of the central portion has the effect of rapidly dissipating heat by the principle of moving the high temperature heat from the high density to the low.

Alternatively, the side end of the body portion 42 may include an unevenness (not shown) to increase the heat radiation efficiency.

The support 44 may have a cylindrical shape. In addition, the support part may be disposed to penetrate the reflective part 20 at the upper portion of the body part 42. In addition, the second light emitting device unit 30 may be disposed on the support 44, and the reflector 20 may be disposed on the side of the support 44. The height of the support 44 may be greater than or equal to the height of the reflector 20. Thus, the light emitted from the second light emitting element portion 30 disposed on the support 44 may be directly emitted to the outside without being reflected by the reflecting portion 20. Although the support 44 is a cylindrical shape, it is not limited thereto. The support may be in the form of a polygonal column of various shapes.

The support 44, the body 42, and the heat dissipation fin may be formed of a metal having excellent thermal conductivity such as, for example, aluminum (Al) or copper (Cu), so that heat generated from the light emitting device C may be efficiently discharged. In addition, it may be made of a resin material excellent in thermal conductivity in addition to the metal.

In addition, it may further include a connecting portion 50 for connecting the reflecting portion 20 and the body portion 42. One end of the connection part 50 is connected to the lower end of the reflecting part and is connected to the upper part of the body part 42. The connection part 50 may have a cylindrical shape, but is not limited thereto and may have a polygonal column shape in various forms.

In addition, the lighting device 1 may further include a cover 60 that surrounds and protects the first and second light emitting device units 10 and 30. The cover 60 may be globe shaped. For example, one end of the cover 60 is connected to the body portion 42 and seals the first and second light emitting element portions 10 and 30. The cover 60 may also be symmetrical about the central axis A of the lighting device.

The cover 60 diffuses and mixes the light from the first and second light emitting device units 10 and 30 so that the light emitted from the first and second light emitting device units 10 and 30 can be diffused to facilitate the diffusion. The material may be applied at its inner end or filled inside the cover 60. The cover 60 may be formed of a diffusion sheet spaced apart from the first and second light emitting device units 10 and 30 by a predetermined distance. The material of the cover 60 may be a transparent plastic, glass, or translucent plastic based on a material such as PC (poly carbonate), poly methyl methacrylate (PMMA), acrylic, etc., and a diffusion material may be mixed with the transparent material. It can also be done. Further, phosphors may be further mixed with the material forming the cover 60 to achieve color conversion of light emitted from the light emitting element portion.

A micro pattern (not shown) may be formed on at least one surface of the cover 60. The micro-pattern formed on one or both sides of the cover 60 serves to diffuse the light, in this case, the cover 60 may be made only of a transparent material that is not mixed with the diffusion material or a transparent material mixed with the diffusion material It may be done.

3 is a cross-sectional view showing an exemplary structure of a light emitting device applied to the present invention.

The light emitting device C includes a light emitting chip including a first type semiconductor layer 202, an active layer 204, and a second type semiconductor layer 208 provided on a substrate S, and a fluorescent layer around the light emitting chip. 215 is applied.

The substrate S may be, for example, a FR4 or FR5 substrate as a resin substrate, or may be made of ceramic or glass fiber material.

The first type semiconductor layer 202, the active layer 204, and the second type semiconductor layer 206 may be formed of a compound semiconductor. For example, the first type semiconductor layer 202 and the second type semiconductor layer 206 may be formed of a nitride semiconductor, that is, Al _x In _y Ga _(1-xy) N (0 ≦ x ≦ 1, 0 ≦ y ≦ 1). , 0 ≦ x + y ≦ 1), and n-type impurities and p-type impurities may be doped, respectively. The active layer 204 formed between the first and second type semiconductor layers 202 and 206 emits light having a predetermined energy by recombination of electrons and holes, and In _x so that the band gap energy is adjusted according to the indium content. It may have a structure in which a plurality of layers of Ga _1-x N (0 ≦ _x ≦ 1) are stacked. In this case, the active layer 204 may be formed of a multi-quantum well (MQW) structure, for example, an InGaN / GaN structure, in which a quantum barrier layer and a quantum well layer are alternately stacked, and the indium content may be adjusted to emit blue light. have.

The fluorescent layer 215 may be configured to include a phosphor that absorbs blue light to excite red light and a phosphor that absorbs blue light to excite green light. Phosphors that excite red light include a nitride phosphor of MAlSiNx: Re (1 ≦ x ≦ 5), a sulfide phosphor of MD: Re, and the like. Here, M is at least one selected from Ba, Sr, Ca, Mg, D is at least one selected from S, Se and Te, Re is Eu, Y, La, Ce, Nd, Pm, Sm, Gd, Tb, At least one selected from Dy, Ho, Er, Tm, Yb, Lu, F, Cl, Br and I. In addition, phosphors that excite green light include M ₂ SiO ₄ : Re phosphorus silicate phosphor, MA ₂ D ₄ : Re phosphorus sulfide phosphor, β-SiAlON: Re phosphor phosphor, MA ′ ₂ O ₄ : Re 'oxide compound Phosphor, etc., M is at least one element selected from Ba, Sr, Ca, and Mg, A is at least one selected from Ga, Al, and In, D is at least one selected from S, Se, and Te, and A ' Is at least one selected from Sc, Y, Gd, La, Lu, Al, and In, and Re is Eu, Y, La, Ce, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, At least one selected from Lu, F, Cl, Br and I, and Re 'is at least one selected from Ce, Nd, Pm, Sm, Tb, Dy, Ho, Er, Tm, Yb, F, Cl, Br and I Can be.

Some of the blue light emitted from the active layer 204 is converted into red light, and some of the blue light is converted into red light, whereby blue light, red light, and green light are mixed to emit white light.

An electrode pattern portion 208 having two areas separated from each other is formed on the substrate S. The electrode pattern portion 208 may be formed of a conductive material, for example, Cu, Pd, Ag, Ni / Au, or the like by using a plating process. The first type semiconductor layer 202 is bonded to one region of the electrode pattern portion 208, and the second type semiconductor layer 206 is bonded to the other region of the electrode pattern portion 208 using the wire W. FIG. .

In addition, a lens-shaped cover 60 layer 217 may be further formed to protect the light emitting chip and to adjust the directivity of light emitted from the light emitting chip. The cover 60 layer 217 may be formed of a transparent material such as resin. The cover 60 layer 217 is not limited to the illustrated shape, and may be formed in a flat shape that does not serve as a lens but only protects the light emitting chip.

4 is a cross-sectional view showing another exemplary structure of a light emitting device C applied to the present invention. The light emitting device C of the present embodiment differs from the embodiment of FIG. 3 in the electrode structure, that is, light emission having the first type semiconductor layer 202, the active layer 204, and the second type semiconductor layer 206. The chip has a structure etched in a mesa shape so that a portion of the first type semiconductor layer 202 is exposed. The exposed region of the first type semiconductor layer 202 is used in one region of the electrode pattern portion 208, and the second type semiconductor layer 206 is used in another region of the electrode pattern portion 209. Is bonded.

5 is a cross-sectional view showing another exemplary structure of a light emitting device C applied to the present invention. In the light emitting device C of the present embodiment, the fluorescent layer 216 is applied only to the upper end of the light emitting chip. The cover 60 layer 219 is illustrated as having a flat shape, but is not limited thereto. The cover 60 layer 219 may have a lens shape in order to adjust the directivity of the light emitted from the light emitting chip.

6 is a cross-sectional view showing another exemplary structure of a light emitting device C applied to the present invention. The light emitting device C of the present embodiment is not a form in which the fluorescent layer is applied only to the upper end of the light emitting chip, but the cover 60 layer 221 is made of a transparent material mixed with phosphors, for example, a resin material. There is a difference from the light emitting element (C). The shape of the cover 60 layer 221 may also have a lens shape that can adjust the directivity of the light emitted from the light emitting chip.

As described above, the light emitting devices C described with reference to FIGS. 3 to 6 are disposed on the substrate S in the form of packages and wire-bonded to the electrode patterns formed on the substrate S. As shown in FIG. In addition, according to a specific shape of the electrode pattern portion formed on the substrate S, adjacent light emitting devices C may be connected in series, in parallel, in series, in a combination of parallel or in parallel.

FIG. 7 is a view showing a light distribution curve of the lighting device 1 of FIG. 1.

Referring to FIG. 7, the portion indicated by the solid line represents the irradiation angle using the lighting device 1 of FIG. 1. The illuminating device 1 of FIG. 1 irradiates light uniformly in almost all directions of 360 degrees. It can be seen that the improvement is much larger than 130 degrees of the irradiation angle of the conventional light source.

8 is an exploded perspective view of the lighting device 2 according to another embodiment of the invention, and FIG. 9 is a front view of the lighting device 2 of FIG. 8.

Compared with the lighting device 1 of FIG. 1, except that the reflecting portion 70 is formed in a wide horn shape, and the support portion 44 and the second light emitting element portion 30 are not provided, The other components are almost identical to the lighting device 1 of FIG. 1. Substantially the same members are denoted by the same reference numerals as in FIG. 1 and the repeated description thereof will be omitted.

8 and 9, unlike the illumination device 1 of FIG. 1, the outer circumferential surface of the reflector 70 may have a larger cross-sectional size toward the first light emitting device unit 10. For example, the reflector 70 may have a wide horn shape (eg, a truncated cone or a polygonal truncated cone). The reflecting unit may be filled with an inner space, or may have a shell shape with an empty inside. In addition, the reflector 70 may be disposed symmetrically with respect to the central axis A of the lighting apparatus.

A portion of the light emitted from the first light emitting element portion 10 is reflected by the reflecting portion 70 and is emitted. When the reflection part 70 as shown in FIG. 8 is arrange | positioned, light may be emitted also in front of a lighting device, without the 2nd light emitting element part 30 arrange | positioned at the central axis A of a lighting device. The lighting device 2 of FIG. 8 can obtain good light distribution characteristics with a simpler configuration.

10 is an exploded perspective view of the lighting device 3 according to another embodiment of the present invention. Compared with the lighting device 1 of FIG. 1, the reflecting portion 80 is formed in a narrow horn shape and has no supporting part, except that the other components are the lighting device 1 of FIG. 1. Is almost the same as Substantially the same members are denoted by the same reference numerals as in FIG. 1 and the repeated description thereof will be omitted.

The lighting device 3 of FIG. 10, unlike the lighting device 1 of FIG. 1, is not provided with a support. The reflector 80 may be filled inside and may have a narrow inverse pyramid shape. For example, the reflector may be formed of a heat conducting material having an inverted pyramidal shape and a reflective material applied to an outer circumferential surface of the inverted pyramidal shape. The second light emitting device unit 30 may be disposed on the reflector 80. Thus, the inside of the reflector 80 performs a heat dissipation function for transferring heat generated from the second light emitting element unit 30 to the body portion 42, and the outer circumferential surface of the reflector 80 performs a reflection function. The reflector 80 may also be arranged symmetrically with respect to the central axis A of the lighting device 3. The lighting device of FIG. 10 may be easier to manufacture than the lighting device of FIG. 1.

11 is an exploded perspective view of the lighting device 4 according to another embodiment of the present invention.

Compared with the lighting device 2 of FIG. 8, the other components except for the reflecting unit 90 are the same as the lighting device 2 of FIG. 8. Therefore, substantially the same members are denoted by the same reference numerals as in FIG. 8 and the repeated description thereof is omitted. The reflector 90 of FIG. 11 is disposed below the first sub-reflector 92 having a wide horn shape and the first sub-reflector 92, and includes a cylindrical second sub-reflector 90. can do. As described above, the inclination angle of the reflector 90 may change at least twice. When the inclination angle is changed in the vertical direction as described above, the light incident on the reflector 90 may be reflected at more various angles. In particular, the dark portion may be prevented from occurring in the center portion of the cover 60 by the first sub reflector 92, and the light diffusion effect may be increased by the second sub reflector 94.

12 is an exploded perspective view of the lighting device 6 according to another embodiment of the present invention. Compared with the lighting device 2 of FIG. 8, other components except for the reflecting unit 110 are the same as the lighting device 2 of FIG. 8. Therefore, substantially the same members are denoted by the same reference numerals as in FIG. 8 and the repeated description thereof is omitted. 12 is at least one third sub reflector 112 and the third sub-reflector 112 formed in the shape of a portion of the horn of the wide bottom and at least one formed in the shape of a pillar The fourth sub reflector 114 may be included. As described above, the inclination angle of the reflector 110 may be changed not only in the vertical but also in the horizontal direction. As described above, when the inclination angle is changed not only in the vertical but also in the horizontal direction, the light may be diffused at more various angles.

The above-described lighting apparatus of the present invention has been described with reference to the embodiment shown in the drawings for clarity, but this is merely exemplary, and those skilled in the art may have various modifications and other equivalent embodiments therefrom. Will understand. Accordingly, the true scope of the present invention should be determined by the appended claims.

1, 2, 3 --- lighting device 10 --- first light emitting element
12 --- first substrate 20, 70, 80, 90, 110 --- reflective
30 --- second light emitting element portion 40 ---- heat radiating portion
42 --- Body 44 --- Support
60 --- cover

Claims

Board;
A reflector having an outer circumferential surface inclined with respect to the substrate; And
And a plurality of light emitting elements disposed on the substrate around a lower end of the outer circumferential surface,
The reflector is a lighting device for reflecting the light emitted from the plurality of light emitting elements.

The method of claim 1,
And at least one of the substrate, the reflector and the plurality of light emitting elements is symmetrical about a central axis of the lighting device.

The method of claim 1,
The plurality of light emitting devices are spaced apart from each other at a predetermined distance from the central axis of the lighting device.

The method of claim 1,
The outer circumferential surface is a lighting device that the area of the cross-section is smaller toward the substrate.

The method of claim 1,
And a projection area of the outer circumferential surface to the substrate covers the plurality of light emitting elements.

The method of claim 1,
And at least one light emitting element disposed on a central axis of the lighting device.

The method according to claim 6,
The reflector is a narrow inverse pyramidal shell shape,
And a support part penetrating through the reflective part and having at least one light emitting device disposed thereon.

8. The method of claim 7,
The height of the support is greater than the height of the reflector lighting device.

8. The method of claim 7,
The support unit has a cylindrical shape.

The method of claim 1,
The reflector is a narrow inverse pyramid shape below,
At least one light emitting device is disposed on an upper surface of the reflector.

The method of claim 10,
The reflector is a lighting device formed of a heat conductive material of the reverse pyramid shape and a reflective material applied to the outer peripheral surface of the inverted truncated cone shape.

The method of claim 1,
The outer circumferential surface is a lighting device that the area of the cross-section is larger toward the substrate.

13. The method of claim 12,
The reflector is a lighting device having a wide horn-shaped bottom.

13. The method of claim 12,
The reflector includes:
And a second sub reflector having a wide horn-shaped first sub reflector and a columnar second sub reflector disposed below the first sub reflector.

13. The method of claim 12,
The reflector includes:
And at least one third sub-reflector formed in a part of a wide horn, and at least one fourth sub-reflective part disposed at a side of the first sub-reflective part and formed in a part of a pillar.

The method of claim 1,
And a body part supporting the substrate and the reflecting part and dissipating heat generated from the plurality of light emitting devices.

17. The method of claim 16,
And a connection part connecting the reflection part and the body part.

18. The method of claim 17,
The connecting unit has a cylindrical shape lighting device.