KR20130084395A - Lighting device - Google Patents

Abstract

PURPOSE: A lighting device is provided to improve a luminous property of a rear surface by including a radiator, a light emitting module part, and a cover part. CONSTITUTION: A member (120) is arranged on one side of a radiator (140). A light emitting module part (130) has multiple light emitting elements. A cover part is arranged on the member. A first reflective part is arranged on one side of the radiator. A second reflective part is arranged on the first reflective part.

Description

LIGHTING DEVICE

An embodiment relates to a lighting device.

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. Therefore, much research has been conducted to replace conventional light sources with light emitting diodes. Light emitting diodes are increasingly used as light sources for various lamps used in indoor / outdoor, liquid crystal display devices, electric sign boards, streetlights, and the like .

The embodiment provides a lighting device having improved rear light distribution characteristics.

In addition, the embodiment provides a lighting device that can remove the dark portion.

Illumination apparatus according to the embodiment, the radiator having one surface; A member disposed on one surface of the heat sink; A light emitting module unit disposed on one surface of the heat sink and having a plurality of light emitting elements disposed around the member; And a cover part coupled to the radiator and disposed on the light emitting module part and the member, wherein the member is disposed on the first reflecting part and the first reflecting part disposed on one surface of the radiator. The first reflector reflects the light emitted from the light emitting elements in a rearward direction in which the radiator is disposed, and the second reflector reflects light in the front direction in which the cover is disposed.

Illumination apparatus according to the embodiment, the radiator having one surface; A light emitting module unit having a plurality of light emitting elements disposed on one surface of the heat sink; A member disposed on a central portion of one surface of the heat sink and having a first trumpet-shaped reflector and a second horn-shaped reflector disposed on the first reflector; And a cover part coupled to the radiator and disposed on the light emitting module part and the member.

Using the lighting apparatus according to the embodiment, there is an advantage that the rear light distribution characteristic is improved.

In addition, there is an advantage that can remove the dark portion that may appear on the front of the cover portion.

1 is a perspective view of a lighting apparatus according to an embodiment;
FIG. 2 is an exploded perspective view of the lighting apparatus shown in FIG. 1;
3 is a cross-sectional view of the lighting apparatus shown in FIG.
4 is a plan view for explaining the positional relationship between the light emitting module unit and the member shown in FIG.
5 is a cross-sectional view for describing a positional relationship between a light emitting module unit and a member shown in FIG. 1;
FIG. 6 is a view for explaining back light distribution characteristics and dark portion improvement characteristics according to positions of the member, the light emitting module unit, and the heat radiator illustrated in FIG. 1;
7 is an exploded perspective view of a lighting apparatus according to another embodiment;
FIG. 8 is a cross-sectional view illustrating a coupling structure of a substrate and a member shown in FIG. 7. FIG.

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

In the description of embodiments according to the present invention, it is to be understood that where an element is described as being formed "on or under" another element, On or under includes both the two elements being directly in direct contact with each other or one or more other elements being 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.

Hereinafter, a lighting apparatus according to an embodiment will be described with reference to the accompanying drawings.

1 is a perspective view of a lighting apparatus according to an embodiment, FIG. 2 is an exploded perspective view of the lighting apparatus illustrated in FIG. 1, and FIG. 3 is a cross-sectional view of the lighting apparatus illustrated in FIG. 1.

1 to 3, the lighting device 100 includes a cover 110, a member 120, a light emitting module 130, a radiator 140, a power control unit 150, and an inner case 160. And an outer case 170.

The cover unit 110 protects the light emitting module unit 130 and the member 120 from the outside.

The cover 110 distributes the light generated from the light emitting module 130 to the front (top) or the rear (bottom) of the lighting device 100.

The radiator 140 is for discharging heat generated from the light emitting module 130 to the outside when the lighting apparatus 100 is driven. The radiator 140 may improve heat dissipation efficiency through surface contact with the light emitting module unit 130.

The outer case 170 accommodates the radiator 140, the power control unit 150, the inner case 160, and together with the cover 110, determines the external shape of the lighting device 100.

Hereinafter, the lighting device 100 according to the embodiment will be described in detail with reference to each component.

<Cover part>

The cover 110 has a bulb shape having an opening G1, and an inner surface of the cover 110 is coated with a milky white paint. The paint may include a diffusion material such that light when passing through the cover 110 is diffused from the inner surface of the cover 110.

The material of the cover part 110 may be glass, but there is a weak problem in weight or external impact, so that plastic, polypropylene (PP), polyethylene (PE), or the like may be used. Here, polycarbonate (PC) or the like having good light resistance, heat resistance, and impact strength properties may be used.

For convenience of description, in the cover unit 110, a portion adjacent to the opening G1 is called a rear surface, and a portion on the second reflecting unit 125 of the member 120 is called a front surface.

<Absence>

The member 120 reflects at least some of the light emitted from the light emitting module 130 to the cover 110 at least twice. The member 120 improves the rear light distribution characteristic of the lighting device 100 and prevents the dark portion from appearing on the front surface of the cover 110. Hereinafter, the member 120 will be described in more detail.

The member 120 may include a base portion 121 and first and second reflecting portions 123 and 125.

The base portion 121 and the first and second reflecting portions 123 and 125 may be integrated, and may be separately manufactured and mechanically coupled by an adhesive.

The base portion 121 has a disc shape. The base portion 121 is disposed in the mounting groove 130a of the light emitting module unit 130. The shape of the base portion 121 corresponds to the shape of the mounting groove 130a. The first reflecting portion 123 is disposed on the upper surface of the base portion 121.

The first reflecting unit 123 reflects the light emitted from the light emitting element 133 of the light emitting module unit 130. The first reflecting portion 123 has a shape extending outward from the upper surface of the base portion 121. Specifically, the first reflecting portion 123 extends upward along the central axis A of the upper surface of the base portion 121, and has a shape that increases as the diameter increases along the central axis A. FIG.

The first reflecting portion 123 has a trumpet shape. The surface of the first reflector 123 may be a curved surface to increase the rear light distribution characteristic, but is not limited thereto. The surface of the first reflector 123 may be a flat surface.

In addition, the diameter of the upper end portion of the first reflecting portion 123 is larger than that of the lower end portion. The second reflector 125 is disposed on the upper end of the first reflector 123. The first reflector 123 may be integrated with the second reflector 125.

The second reflector 125 reflects the light incident from the inner surface of the cover 110 back to the inner surface of the cover 110. The dark part is not generated at the front surface of the cover part 110 by the second reflector 125.

The second reflector 125 is disposed on the first reflector 123. In detail, the second reflector 125 may be connected to an upper end of the first reflector 123.

The second reflector 125 extends upward along the central axis A, and has a shape that decreases as the diameter increases along the central axis A. FIG. The second reflector 125 has a horn shape. The upper end of the second reflector 125 has a pointed shape like a horn. The upper end of the second reflector 125 may be spaced apart from the inner surface of the cover 110 by a predetermined distance, or may be connected to the inner surface of the cover 110. The surface of the second reflector 125 may be curved to block the generation of the dark portion in front of the cover 110, but is not limited thereto, and the surface of the second reflector 125 may be flat. .

Although the member 120 is illustrated to include the base portion 121 in the embodiment, the member 120 may be formed of the first and second reflecting portions 123 and 125 without the base portion 121.

The material of the member 120 may be formed of a metal material or a resin material having high reflection efficiency. The resin material may include, for example, any one of PET, PC, and PVC resin, and the metal material may include silver (Ag), an alloy containing silver (Ag), an alloy containing aluminum (Al), or aluminum (Al). It may include at least one of.

The surface of the member 120, in particular, the surfaces of the first and second reflectors 123 and 125, are diffused with silver (Ag), aluminum (Al), and white PSR (photo solder resist) ink, to facilitate light reflection. It may be coated with a sheet or the like, or an oxide film may be formed by an anodizing treatment.

<Light Emitting Module Part>

The light emitting module unit 130 may include a substrate 131 and a plurality of light emitting elements 133 disposed on the substrate 131.

The substrate 131 may have a disc shape, and the substrate 131 may have a seating groove 130a in which the base 121 of the member 120 is accommodated. The mounting groove 130a is disposed at the center of the substrate 131.

The substrate 131 may be a circuit pattern printed on an insulator, and for example, a general printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or the like may be used. It may include. Here, the substrate 131 may use a Chips On Board (COB) type capable of directly bonding an LED chip that is not packaged on a printed circuit board. The COB type substrate may include a ceramic material to secure heat resistance and insulation against heat generated when the lighting apparatus 100 is driven.

The substrate 131 may be formed of a material that reflects light efficiently, or the surface may be coated with a color that reflects light efficiently, for example, white, silver, or the like.

The plurality of light emitting elements 133 are disposed on the substrate 131 and disposed radially with respect to the member 120.

The plurality of light emitting elements 133 may be light emitting diodes (LEDs). The light emitting diode 133 may be a red, green, blue, or white light emitting diode that emits red, green, blue, or white light, respectively. The light emitting diode 133 may be a horizontal, flip or vertical light emitting diode chip. The kind or number of light emitting diodes 133 is not limited to those listed above.

<Heat radiator>

The radiator 140 has an accommodating groove 140a for accommodating the power control unit 150 and the inner case 160.

The radiator 140 may include an upper end 141 and a lower end 143. The upper end 141 may be an upper cylindrical part having a cylindrical shape. The upper cylindrical portion 141 has a circular upper surface on which the light emitting module 130 is disposed, and increases in diameter downward along the central axis A passing through the center of the upper surface. The lower portion 143 may be a lower cylindrical portion having a cylindrical shape. The lower cylindrical portion 143 extends to the upper cylindrical portion 141 and decreases in diameter downward along the central axis A. FIG.

The upper cylindrical portion 141 has a hole 141a penetrating the upper surface of the upper cylindrical portion 141. Here, the hole 141a may be located at the center of the upper surface of the upper cylindrical portion 141. The hole 141a is a connection passage for allowing the wire drawn out from the power control unit 150 installed inside the heat sink 140 to be electrically connected to the light emitting module unit 130.

The width of the upper surface of the upper cylindrical portion 141, or the height of the upper cylindrical portion 141 may vary depending on the overall width of the light emitting module 130 or the entire length of the power control unit 150.

The lower cylindrical portion 143 may have a plurality of recesses 143a. The plurality of recesses 143a may be disposed on the surface of the lower cylindrical portion 143 and may be grooves that are long in the longitudinal direction of the lower cylindrical portion 143. The plurality of recesses 143a are disposed radially along the surface of the lower cylindrical portion 143. The recess 143a of the lower cylindrical portion 143 may increase the surface area of the lower cylindrical portion 143 to improve heat dissipation efficiency of the radiator 140.

Although the plurality of recesses 143a are only illustrated in the lower cylindrical portion 143 in the embodiment, the upper cylindrical portion 141 also has a plurality of recesses 143a having the same shape as the lower cylindrical portion 143. Can have In addition, the plurality of recesses 143a formed on the surface of the lower cylindrical portion 143 may be disposed in the upper cylindrical portion 141.

In addition, the heat sink 140 may have a heat radiation fin. That is, a plurality of heat sink fins may be formed on the surface of the heat sink 140. The convex portion between the two recesses 143a may be a heat radiation fin.

The radiator 140 may be formed of a metal material or a resin material having excellent heat dissipation efficiency, but is not limited thereto. For example, the material of the heat sink 140 may include at least one of aluminum (Al), nickel (Ni), copper (Cu), silver (Ag), and tin (Sn).

Although not shown in the drawing, a heat sink (not shown) may be disposed between the light emitting module unit 130 and the heat sink 140. The heat sink (not shown) may be formed of a thermal conductive silicon pad or a thermal conductive tape having excellent thermal conductivity, and may effectively transfer heat generated by the light emitting module unit 130 to the heat sink 140.

<Power control unit>

The power control unit 150 is disposed in the accommodation groove 140a of the heat sink 140. The power control unit 150 transmits power input from the outside to the light emitting module unit 130.

The power control unit 150 may include a support substrate 151 and a plurality of components 153 disposed on the support substrate 151. The plurality of components 153 may include, for example, a DC converter for converting AC power provided from an external power source into DC power, a driving chip for controlling driving of the light emitting module unit 130, and a light emitting module unit 130. An electrostatic discharge (ESD) protection element for protection may be included, but is not limited thereto.

<Inner case>

The inner case 160 may include an inserting portion 161 inserted into the receiving groove 140a of the heat sink 140 and a connection terminal 163 electrically connected to an external power source.

The inner case 160 may be formed of a material having excellent insulation and durability. For example, the inner case 160 may be formed of a resin material.

Insertion portion 161 has a hollow cylindrical shape. The insertion unit 161 may be inserted into the receiving groove 140a of the heat sink 140 to prevent an electric short between the power control unit 150 and the heat sink 140, thereby improving the withstand voltage of the lighting device 100. .

The connection terminal 163 may be electrically connected to an external power source, for example, in a socket manner.

<Mechanism and electrical connection structure of power control unit and inner case>

The power control unit 150 may be disposed in the accommodation groove 140a of the heat sink 140.

The support substrate 151 of the power control unit 150 may be placed upright in a direction perpendicular to one surface of the substrate 131 to smooth air flow in the inner case 160. Therefore, as compared with the case in which the support substrate 151 is disposed in the horizontal direction with respect to one surface of the substrate 131, air flow may occur due to convection in the up and down directions inside the inner case 160. The heat radiation efficiency of the lighting device 100 can be improved.

Meanwhile, the support substrate 151 may be disposed in the inner case 160 in a direction perpendicular to the length direction of the inner case 160, but is not limited thereto.

The power control unit 150 may be electrically connected to the light emitting module unit 130 by the first wiring 150a and may be electrically connected to the connection terminal 163 of the inner case 160 by the second wiring 160a. have. In detail, the second wiring 160a may be connected to the first electrode 163a and the second electrode 163b of the connection terminal 163 to receive power from an external power source.

In addition, the first wiring 150a may pass through the through hole 141a of the radiator 140 to electrically connect the power control unit 150 and the light emitting module unit 130.

<Outer case>

The outer case 170 is coupled to the inner case 160 to accommodate the radiator 140, the light emitting module unit 130, and the power control unit 150.

Since the outer case 170 surrounds the heat sink 140, a user's image accident and electric shock accident may be prevented. That is, the user can easily handle the lighting device 100.

The outer case 170 includes a ring structure 171, a cone-shaped body portion 173 having an opening therein, and a connection portion 175 for physically connecting the ring structure 171 and the body portion 173.

The body portion 173 may have a cone shape. The body portion 173 may have a shape corresponding to the lower cylindrical portion 143 of the heat sink 140. The connection part 175 may be a plurality of ribs, and an opening G2 is formed between the plurality of ribs 175.

The outer case 170 may be formed of a material having excellent insulation and durability, and for example, may be formed of a resin material.

Here, if necessary, the structure without the outer case 170 is possible.

Since the lighting device 100 is made of a structure that can replace the conventional conventional arrangement bulb structurally, it is possible to use the equipment for the conventional conventional arrangement bulb without improvement of the mechanical connection structure or assembly according to the new lighting device. There is an advantage.

4 is a plan view illustrating a positional relationship between the light emitting module unit 130 and the member 120 illustrated in FIG. 1, and FIG. 5 is a position between the light emitting module unit 130 and the member 120 illustrated in FIG. 1. It is sectional drawing for demonstrating a relationship.

Referring to FIG. 4, the light emitting elements 133 disposed on the substrate 131 are arranged radially along the circumference of the substrate 131, but when the light emitting elements 133 emit light, they are perpendicular to the front surface. When the emitted light is obscured by the member 120, a dark portion D appears on the front surface of the cover 110, in particular, the center portion, which results in substantially lowered light distribution characteristics. Therefore, the positional relationship between the member 120 and the plurality of light emitting elements 133 arranged on the substrate 131 becomes an important issue. Therefore, in the embodiment, as shown in FIG. 4, the member 120 is not disposed on the plurality of light emitting devices 133. That is, the plurality of light emitting elements 133 are disposed outside the member 120.

Referring to FIG. 5, the distance D2 between at least two light emitting elements 131 facing the center axis A of the substrate 131 among the plurality of light emitting elements 133 disposed radially is The plurality of light emitting devices 133 are disposed on the substrate 131 to be larger than the maximum diameter D1 of the member 120. Here, the maximum diameter D1 of the member 120 is the diameter of the connecting portion of the first reflecting portion 123 and the second reflecting portion 125. By the positional relationship between the plurality of light emitting devices 133 and the member 120, the arm part D, which may be generated on the front surface of the cover part 110, may be further improved.

FIG. 6 is a diagram for describing rear light distribution characteristics and dark portion improvement characteristics according to positions of the member 120, the light emitting module unit 130, and the heat sink 140 illustrated in FIG. 1.

Referring to FIG. 6, some of the light emitted from the light emitting element 133 is reflected by the first reflecting unit 123 of the member 120 and irradiated to the rear surface of the cover unit 110. Some of the light irradiated to the rear surface of the cover unit 110 may be emitted to the outside through the cover unit 110, the other portion may be reflected from the inner surface of the cover unit 110 to the member 120. Some of the light reflected by the member 120 may be incident to the second reflector 125, and the second reflector 125 reflects the incident light toward the front surface of the cover 110. Therefore, by the member 120 having the first and second reflecting portions 123 and 125, the light portion is sufficiently emitted to the rear surface of the cover portion 110, and the dark portion may appear on the front surface of the cover portion 110. Can be removed.

On the other hand, sufficient light distribution characteristics may be obtained at the rear of the cover 110 when there is no obstacle on the optical path irradiated to the rear of the cover 110. Therefore, as shown in FIG. 3, the outer circumferential surface of the upper cylindrical portion 141 of the heat sink 140 is inclined with respect to the central axis A of the heat sink 140. For example, an obtuse angle formed between the central axis A and the outer circumferential surface of the upper cylindrical portion 141 of the heat sink 140 may be about 130 degrees or more. Accordingly, since the light reflected from the member 120 is irradiated to the rear surface of the cover unit 110 without obstacle, the rear light distribution characteristic can be improved.

FIG. 7 is an exploded perspective view illustrating a lighting apparatus according to another embodiment, and FIG. 8 is a cross-sectional view illustrating a coupling structure of the substrate 331 and the member 320 illustrated in FIG. 7.

7 and 8, the lighting device 300 according to another embodiment may include a cover 310, a member 320, a light emitting module 330, a radiator 340, a power control unit 350, An inner case 360 and an outer case 370 are included. Except for the member 320 and the light emitting module 330, the same parts as those of the lighting apparatus shown in FIG. 2 will be omitted.

The member 320 includes a base portion 325 having a disc shape, a ring structure 327 extending from the outer circumference of the base portion 325, and a protrusion 324 protruding upward along the central axis A of the base portion 325. It includes. In the drawing, member 320 is shown to include a protrusion 324 that acts as a reflector, but member 320 may include only the base portion 325 and ring structure 327 without protrusion 324. .

The base portion 325 has a plurality of holes 325a. A plurality of light emitting elements 333 are inserted into the plurality of holes 325a, respectively. Thus, the plurality of light emitting elements 333 are exposed on the top surface of the member 320. Although the shape of the base portion 325 is shown in the shape of a disk, any shape can be used as long as it can wrap or cover the substrate 331 disposed below the member 320 in a hexagonal shape or other various shapes.

The ring structure 327 extends outward from the outer circumference of the base portion 325 and has a shape inclined toward the substrate 331. The ring structure 327 inclined in the direction of the substrate 331 is not an obstacle in the optical path when the light generated from the light emitting element 333 is reflected by the cover 310 and irradiated to the back of the cover 310. The rear light distribution characteristic of the cover part 310 may be improved.

An angle α formed between the side surface of the substrate 331 and the ring structure 327 may be an acute angle, that is, about 0 degrees or more and about 60 degrees or less. In addition, one surface of the ring structure 327 may form a predetermined angle with one surface of the base portion 325 for workability for coupling the light emitting device 333 and the member 320.

The end of the ring structure 327 may be located on an imaginary surface collinear with the bottom surface of the substrate 331. The alignment between the member 320, the light emitting module unit 330, and the radiator 340 may be improved by contacting a flat surface of the radiator 340 disposed under the substrate 331.

The protrusion 324 may have the same structure as the first and second reflectors 123 and 125 of the member 120 illustrated in FIG. 2. That is, the protrusion 324 may include the first reflecting portion 324-1 and the second reflecting portion 324-2 as shown in FIG. 8. The description of the first and second reflectors 324-1 and 324-2 shown in FIG. 8 is replaced with the description of the first and second reflectors 123 and 125 shown in FIG. 2.

The light emitting module unit 330 may include a substrate 331 and a plurality of light emitting devices 333. The substrate 331 has a flat disc shape. Herein, the substrate 331 may have a rectangular shape, a hexagonal shape, and various other shapes as well as a disk shape.

In addition, the distances from each of the plurality of light emitting devices 333 to the ring structure 327 of the member 320 are substantially the same. Accordingly, it can have a uniform light directivity angle or light distribution characteristics.

Although the above description has been made with reference to the embodiments, these are only examples and are not intended to limit the present invention, and those of ordinary skill in the art to which the present invention pertains should not be exemplified above without departing from the essential characteristics of the present embodiments. It will be appreciated that many variations 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.

110:
120: absence
130: light emitting module
140: heat sink
150: power control unit
160: inner case
170: outer case

Claims (10)

A heat sink having one surface;
A member disposed on one surface of the heat sink;
A light emitting module unit disposed on one surface of the heat sink and having a plurality of light emitting elements disposed around the member; And
And a cover part coupled to the radiator and disposed on the light emitting module part and the member.
The member has a first reflecting portion disposed on one surface of the heat sink and a second reflecting portion disposed on the first reflecting portion,
And the first reflector reflects light emitted from the light emitting elements in a rear direction with the heat sink and the second reflector reflects light in a front direction with the cover. The method of claim 1,
The first reflecting portion has a shape in which the diameter increases toward one side of the heat sink,
The second reflector is a lighting device having a shape that decreases in diameter as it goes up from one surface of the heat sink. A heat sink having one surface;
A light emitting module unit having a plurality of light emitting elements disposed on one surface of the heat sink;
A member disposed on a central portion of one surface of the heat sink and having a first trumpet-shaped reflector and a second horn-shaped reflector disposed on the first reflector; And
A cover part coupled to the radiator and disposed on the light emitting module part and the member;
&Lt; / RTI &gt; The method according to claim 1 or 3,
And at least one of the surfaces of the first and second reflecting portions is curved. The method according to claim 1 or 3,
The light emitting module unit is disposed on one surface of the heat sink, and has a substrate on which the plurality of light emitting elements are disposed.
The member is disposed on a central portion of the substrate. The method of claim 5, wherein
The substrate has a seating groove in the center,
The member has a base portion disposed in the seating groove. The method of claim 5, wherein
The member has a base portion disposed on the substrate,
And the base portion has a plurality of holes into which each of the plurality of light emitting elements is inserted. The method of claim 7, wherein
The member further includes a ring structure connected to the outer periphery of the base portion,
The ring structure is inclined at a predetermined angle in the direction of one surface of the heat sink from the outer periphery of the base portion. The method according to claim 1 or 3,
The plurality of light emitting elements are disposed outside the member. The method according to claim 1 or 3,
The heat sink has a receiving groove,
And an inner case housed in the accommodating groove of the heat sink, a power control unit housed in the inner case, and an outer case surrounding the heat sink.

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