KR20130065914A - Lighting device - Google Patents

Abstract

PURPOSE: A lighting device is provided to reinforce side light distribution by a circular cone shaped arrangement of an optical surface. CONSTITUTION: A heat sink (100) receives the heat generated by multiple optical source section (300) and a power supply unit (600) and discharges the heat to the outside. A base (200) is arranged in the middle of a distribution department (110) of the heat sink, and the multiple optical source sections are arranged on the base. An optical source section comprises a substrate (310) and luminous elements (330). An optical section (400) is arranged on the optical source sections (300) and reflects the light from the luminous elements through an optical surface (410). The optical surface is arranged on the center of the optical source sections and formed in a circular cone surface protruding from the inside of the optical section to the center of the optical source sections.

Description

LIGHTING DEVICE

Embodiments relate to a lighting device.

Light emitting diodes (LEDs) are a type of semiconductor device that converts electrical energy into light. Light emitting diodes have the advantages of low power consumption, semi-permanent life, fast response speed, safety and environmental friendliness compared to conventional light sources such as fluorescent and incandescent lamps. Accordingly, many researches have been conducted to replace the existing light source with light emitting diodes, and light emitting diodes have been increasingly used as light sources for lighting devices such as liquid crystal display devices, electronic displays, and street lights.

The embodiment provides an illumination device capable of enhancing side light distribution.

In addition, the embodiment provides a lighting device that can adjust the side light distribution.

Illumination apparatus according to the embodiment, the light source unit having a plurality of light emitting elements; And an optical unit disposed on the light source unit, the optical unit having an optical surface that reflects light from the light emitting elements, wherein the optical surface is disposed above the center of the light source unit, and the center of the light source unit on the inner surface of the optical unit. Conical surface protruding in the direction.

Illumination apparatus according to the embodiment, the light source unit having a plurality of light emitting elements; And an optical part disposed on the light source part, the optical part having an optical surface reflecting light from the light emitting elements, having a hollow sphere shape, and having an outer surface and an inner surface. When one of the curves is a circular arc of a circle, the circle has a center and a radius, and the center of the circle divides a line segment that forms an acute angle with a reference axis n (where n is a natural number). The reference axis is the axis passing through the center of the optical portion and the center of the light emitting elements, and the line segment is a first intersection point in the center of the optical portion, m is (m is a natural number less than n); The first intersection is a point where the line segment and the outer surface of the optical unit intersect, the radius of the circle is a length from the center of the circle to a symmetry point, and the symmetry point is the light emitting element. The centers of the children are symmetrically moved relative to the center of the optical unit, the arc is a curve connecting the second intersection point and the symmetry point, and the second intersection point is the point where the inner surface of the circle and the optical unit intersect.

Using the lighting apparatus according to the embodiment, there is an advantage that can obtain the enhanced side light distribution.

In addition, there is an advantage that can adjust the side light distribution.

1 is a cross-sectional view of a lighting apparatus according to an embodiment,
2 is a cross-sectional view of the optical unit shown in FIG.
3 is a light distribution diagram showing light distribution of light emitted from a light source unit of the lighting apparatus shown in FIG. 1;
4 is a light distribution diagram showing light distribution of light emitted from an optical unit of the lighting apparatus shown in FIG. 1;
5 to 8 is a light distribution diagram according to the ratio of m and n.

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 cross-sectional view of a lighting apparatus according to an embodiment.

Referring to FIG. 1, the lighting apparatus according to the embodiment may be a bulb type lighting apparatus.

The lighting apparatus according to the embodiment may include a heat sink 100, a base 200, a light source unit 300, an optical unit 400, a cover unit 500, a power supply unit 600, an inner case 700, and It may include a socket portion 800.

The heat sink 100 receives heat generated from the light source 300 and the power supply 600 and emits the heat to the outside. Therefore, the heat sink 100 may be a metal material or a resin material having excellent heat dissipation efficiency. For example, the heat sink 100 may include at least one of aluminum (Al), nickel (Ni), copper (Cu), silver (Ag), and tin (Sn).

The heat sink 100 has a placement unit 110 on which the base 200 is disposed. The placement unit 110 may be one flat surface of the heat sink 100. A portion of the placement unit 110 of the heat sink 100 is penetrated by a wire or a pin that transmits power from the power source unit 600 to the light source unit 300.

The heat sink 100 has an accommodating part 150 accommodating the power source 600 and the inner case 700. The accommodating part 150 may be a recess formed in the heat sink 100.

The heat sink 100 is coupled to the cover part 500. The combination of the heat sink 100 and the cover part 500 may be coupled through various methods such as a rotation coupling method and an interference fit method.

The heat sink 100 is coupled to the inner case 700. The heat sink 100 and the inner case 700 may be coupled through various methods such as a fastening method using a screw or the like.

The base 200 is disposed on the placement unit 110 of the heat sink 100. In particular, the base 200 is disposed at the center of the placement unit 110 of the heat sink 100.

The base 200 arranges the light source 300 to be adjacent to the inner center of the cover 500. By the base 200, the light source unit 300 is disposed at the inner center of the cover unit 500, and the light emitted from the light source unit 300 may be emitted in all directions.

The base 200 may be a member having a predetermined height. For example, the base 200 may have a predetermined height, and a diameter of the lower end adjacent to the placement unit 110 may be a member larger than the diameter of the upper end of the light source unit 300.

A plurality of light source units 300 are disposed on the base 200. In detail, the upper end of the base 200 has the placement unit 210, and the plurality of light source units 300 are disposed on the deployment unit 210.

The base 200 is coupled to the optical unit 400. In detail, the placement unit 210 of the base 200 may be coupled to the optical unit 400.

The inside of the base 200 is penetrated by a wire or the like from the power supply unit 600.

The material of the base 200 may be the same as the material of the heat sink 100. That is, it may be a material capable of transferring the heat generated from the light source 300 to the heat sink 100.

The outer surface of the base 200 may be coated with a reflective film that easily reflects light from the light source 300 and the cover 500. Here, the reflective film may be white paint or may be a mirror surface.

The light source unit 300 may include a substrate 310 and a light emitting device 330. The light source unit 300 is electrically connected to a wire or the like from the power source unit 600.

The substrate 310 is disposed on the placement unit 210 of the base 200, and the light emitting device 330 is disposed on the substrate 310. In FIG. 1, one light emitting device 330 is illustrated on one substrate 310, but is not limited thereto. As another example, a plurality of light emitting devices 330 may be disposed on one substrate 310.

The substrate 310 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 310 may be a chip on board (COB) that can directly bond the LED chip not packaged on the printed circuit board. COB may include a ceramic material to secure heat resistance and insulation against heat.

The substrate 310 may be formed of a material that reflects light efficiently, or the surface may be coded in a color that reflects light efficiently, for example, a white or silver paint.

The light emitting element 330 is disposed on the substrate 310. In addition, a plurality of light emitting devices 330 may be disposed on the substrate 310.

The light emitting device 330 may be a light emitting diode chip that emits blue, red, and green light or a light emitting diode chip that emits white light. In addition, the light emitting device 330 may be a light emitting diode chip that emits UV light. Here, the LED chip may be a horizontal type or a vertical type.

The light emitting device 330 may be molded by a lens. The lens may adjust a direction or direction of light emitted from the light emitting element 330. The lens may be a hemispheric type and may be filled with a translucent resin such as a silicone resin or an epoxy resin as a whole without voids.

Here, the translucent resin may include phosphors wholly or partially dispersed. When the light emitting device 330 is a light emitting diode emitting blue light, phosphors included in the translucent resin may include garnet-based (YAG, TAG), silicate-based, nitride-based and oxynitride. It may include at least one or more of the (Oxynitride) system. Natural light (white light) can be realized by including only a yellow phosphor in the translucent resin. However, a green phosphor or a red phosphor may be further included to improve the color rendering index and reduce the color temperature.

When various kinds of phosphors are mixed in the light-transmissive resin, the addition ratio according to the color of the phosphor may use more green phosphors than red phosphors and more yellow phosphors than green phosphors.

The light transmissive resin can be divided into a plurality of layers. For example, the translucent resin may be a layer having a layer having a red phosphor, a layer having a green phosphor, and a layer having a yellow phosphor.

The optical unit 400 is disposed on the base 200. Specifically, the optical unit 400 may be disposed on the placement unit 210 of the base 200 while surrounding the light source unit 300.

The optical unit 400 may have a phosphor. The optical unit 400 may have at least one of a yellow phosphor, a green phosphor, and a red phosphor. The yellow phosphor, the green phosphor, and the red phosphor are excited by blue light emitted from the light source 300 to emit yellow light, green light, and red light. More specifically, the yellow phosphor emits light having a main wavelength in the range of 540 nm to 585 nm in response to blue light (430 nm to 480 nm). The green phosphor emits light having a main wavelength in the range of 510 nm to 535 nm in response to blue light (430 nm to 480 nm). The red phosphor emits light having a main wavelength in the range of 600 nm to 650 nm in response to blue light (430 nm to 480 nm). The yellow phosphor may be a silicate or yag phosphor, the green phosphor may be a silicate, nitride or sulfide phosphor, and the red phosphor may be a nitride or sulfide phosphor.

The optical unit 400 has a spherical shape. In the present specification, the spherical shape includes not only a geometrically perfect sphere but also a shape in which a part of the general sphere is removed. In addition, one part is not a general sphere and the other one also includes the shape which is a sphere.

The optical unit 400 has a hollow sphere shape. The optical unit 400 has an outer surface and an inner surface. The optical unit 400 has a predetermined thickness, which is a distance between the outer surface and the inner surface.

The optical unit 400 has an optical surface 410 that reflects light emitted from the light source unit 300.

The optical surface 410 may be a part of the inner surface of the optical unit 400 or may be disposed on the inner surface of the optical unit 400. The portion may be disposed on the center of the light source 300. The optical surface 410 may have a shape protruding from the inner surface of the optical unit 400 toward the center of the light source unit 300. For example, the optical surface 410 may be a conical surface. The conical plane means the other side except for the bottom of the cone. In the present specification, the conical surface includes not only a conical surface of a geometrically perfect cone, but also a conical surface curved in an outward direction of the optical unit 400 as well as a conical surface curved in the inward direction of the optical unit 400.

The optical surface 410 reflects the light emitted from the light source 300 in the lateral direction. Therefore, side light distribution of the lighting apparatus according to the embodiment may be enhanced. Here, the lateral direction means the direction of the interruption side between the upper end and the lower end of the cover part 500, and the side light distribution refers to the intensity of light emitted to the outside through the stop part of the cover part 500.

In addition, the optical surface 410 may have a function of reflecting light from the light source unit 300 and a transmission function of transmitting some light. Since the optical surface 410 has a transmission function, it is possible to remove the dark portion that may occur in the upper end of the cover portion 500.

The optical surface 410 is curved. The curved surface of the optical surface 410 may be determined through certain equations. Hereinafter, with reference to FIGS. 2 to 3 will be described in detail.

2 is a cross-sectional view of the optical unit 400 shown in FIG. 1.

The optical surface 410 shown in FIG. 1 is a collection of a plurality of curves. Each of the plurality of curves is arcs of each of the plurality of circles. Hereinafter, one circular arc of a plurality of circular arcs is calculated through one circular circle.

Referring to FIG. 2, P is a reference axis passing through the center O of the optical unit 400 and the center A of the light source unit 300 shown in FIG. 1. Here, the center A of the light source unit 300 means the center of the plurality of light emitting devices 330. A 'is a point of symmetry of A with respect to the center O of the optical unit 400, θ is an acute angle (0 ° <θ <90 °), J is a line segment and an optical acute angle with the reference axis (P) The outer surface of the part 400 intersects with the first intersection point.

Circle (C) has a center (I) and a radius, and abuts the reference axis (P).

The center I of the circle C is m at the center O of the optical unit 400 when the line segment connecting the center O of the optical unit 400 and the first intersection point J is divided by n equal parts. Is the first position. Here, n and m are natural numbers, and m is a natural number smaller than n.

The radius of the circle C is the length from the center I of the circle C to the point of symmetry A '. The circle C is determined by the center I and the radius.

Once the circle C has been determined, the optical surface 410 shown in FIG. 1 includes an arc H of the circle C. As shown in FIG. Arc (H) is a curve connecting point J 'and point A' in circle (C). J 'is the point where the inner surface of the optical unit 400 and the circle (C) meet. Here, when the inner surface of the optical unit 400 and the circle (C) meets two points, the point closer to the reference axis (P) of the two points is J '.

The optical surface 410 may be a surface that is made when the circular arc (H) is rotated about the reference axis (P).

3 is a light distribution diagram showing light distribution of light emitted from the light source unit 300 of the lighting apparatus shown in FIG. 1, and FIG. 4 is light distribution showing light distribution of the light emitted from the optical unit 400 of the lighting apparatus illustrated in FIG. 1. It is a distribution chart.

3 and 4, it can be seen that the light distribution of the light emitted from the optical unit 400 is wider or enhanced in the lateral direction. This is expected due to the optical surface 410 of the optical unit 400.

5 to 8 are light distribution distribution charts according to the ratio of m and n. 5 to 8 assumes that the optical unit 400 has a radius of 10 mm, θ of 30 °, and m of 20. FIG. Here, the radius of the optical unit 400 is 10mm means that the distance between the outer surface and the inner surface of the optical unit 400, that is, the thickness is assumed to be zero.

5 is a light distribution distribution diagram when m / n is 0.55, FIG. 6 is a light distribution distribution diagram when m / n is 0.65, FIG. 7 is a light distribution distribution diagram when m / n is 0.8, and FIG. 8 is m / n It is a distribution distribution map when n is 0.9.

5 to 8, it can be seen that as the value of m / n increases, not only the side light distribution is enhanced but also the total light distribution is improved. Herein, the total light distribution refers to the intensity of light emitted over the upper end of the cover part 500 illustrated in FIG. 1.

Referring back to FIG. 1, the cover part 500 is coupled to the heat sink 100 and disposed on the disposition part 110 of the heat sink 100.

The cover unit 500 surrounds the mounting unit 110, the base 200, and the optical unit 400 of the heat sink 100.

The inner surface of the cover portion 500 may be coated with a milky white paint.

The cover part 500 may have a diffusion material for diffusing light from the optical part 400.

The material of the cover part 500 may be glass. Since the glass is weak in weight or external impact, the cover part 500 may be any one of plastic, polypropylene (PP), polyethylene (PE), and polycarbonate (PC). Here, the polycarbonate (PC) has good light resistance, heat resistance, impact strength characteristics.

The surface roughness of the inner surface of the cover 500 may be greater than the surface roughness of the outer surface of the cover 500. In this case, when the light emitted from the optical unit 400 is irradiated to the inner surface of the cover unit 500 to be emitted to the outside, the light irradiated to the inner surface of the cover unit 500 is sufficiently scattered and diffused to be emitted to the outside. Can be. Thus, the light emission characteristics of the lighting device can be improved.

The cover part 500 may be formed through blow molding, which can widen the directing angle of light.

The power supply unit 600 is accommodated in the inner case 700 and received in the accommodating part 150 of the heat sink 100. The power supply unit 600 may include a support substrate and a plurality of components mounted on the support substrate. The plurality of components may include, for example, a DC converter for converting an AC power provided from an external power source into a DC power source, a driving chip for controlling the driving of the light source unit 300, and an ESD (ElectroStatic discharge) to protect the light source unit 300. ), But may not be limited thereto.

The power supply unit 600 receives external power from the socket unit 800, produces power to drive the light source unit 300 using the provided external power, and uses the wire to produce the power source 300. To pass.

The inner case 700 has an upper end accommodating the power supply 600 and a lower end coupled to the socket 800. The upper end of the inner case 700 is accommodated in the accommodating part 150 of the heat sink 100. The lower end of the inner case 700 may have a thread / screw groove structure for coupling with the socket part 800.

The upper end and the lower end of the inner case 700 are integrally formed of an insulating material of a plastic-based or resin-based material which is not electrically conductive. The inner case 700 prevents electrical contact between the heat sink 100 and the power supply unit 600, and prevents electrical contact between the heat sink 100 and the socket part 800.

The socket part 800 is configured to be electrically connected to an external power source, and is coupled to the lower end of the inner case 700. Coupling of the socket portion 800 and the inner case 700 may be coupled in a rotational coupling manner by the thread / thread groove structure. The socket part 800 is electrically connected to the power source 600 through a wire or the like.

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.

100: heat sink
200: base
300: light source
400: optics
500: cover part
600: power supply
700: inner case
800: socket portion

Claims (11)

A light source unit having a plurality of light emitting elements; And
An optical unit disposed on the light source unit and having an optical surface that reflects light from the light emitting elements;
And the optical surface is disposed on the center of the light source portion and is a conical surface protruding from the inner surface of the optical portion toward the center of the light source portion. The method of claim 1,
And the conical surface is curved in an inner or outer direction of the optical unit. A light source unit having a plurality of light emitting elements; And
An optical part disposed on the light source part, the optical part having an optical surface reflecting light from the light emitting elements, having a hollow sphere shape, and having an outer surface and an inner surface;
The optical surface is a collection of curves,
One of the curves is an arc of a circle, the circle has a center and a radius,
The center of the circle is a point located at the mth (wherein m is a natural number smaller than n) when the line segment forming an acute angle with the reference axis is divided into n (where n is a natural number). A reference axis is an axis passing through the center of the optical unit and the center of the light emitting elements, the line segment is a straight line between a first intersection point at the center of the optical unit, and the first intersection is a point where the line segment and an outer surface of the optical unit intersect,
The radius of the circle is a length from the center of the circle to the symmetry point, the symmetry point is a point symmetrically moved from the center of the light emitting element relative to the center of the optical unit,
The arc is a curve connecting the second intersection point and the symmetry point, the second intersection point is the point where the inner surface of the optical portion and the circle intersect. The method according to claim 1 or 3,
And the optical surface transmits some of the light from the light emitting elements. The method according to claim 1 or 3,
And the optical unit emits excitation light excited by light from the light emitting elements. The method of claim 5, wherein
The optical unit has a phosphor having a phosphor. The method according to claim 6,
Wherein said phosphor has at least one of a yellow phosphor, a green phosphor and a green phosphor. The method according to claim 1 or 3,
A heat sink having one side; And
A base disposed on one surface of the heat sink;
The light source unit is disposed on the base,
And the optical unit is coupled to the base. The method of claim 8,
The heat sink has a receiving portion,
A power supply unit disposed in the accommodation unit of the heat sink;
A socket part electrically connected to the power supply part; And
And an inner case of an insulator having an upper end part accommodating the power supply part and disposed in the accommodating part of the heat sink, and a lower end part coupled to the socket part. The method of claim 8,
And a cover part surrounding the optical part. 11. The method of claim 10,
And the cover portion has a diffusing material for diffusing light emitted from the optical portion.

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