KR20120054811A - Lighting device - Google Patents

Abstract

PURPOSE: A lighting device is provided to improve light excitation efficiency by changing the wavelength of light emitted from a light emitting device. CONSTITUTION: A lighting device includes a radiator(110), a substrate, and a light excitation plate(130). The substrate is arranged on the radiator and has a light emitting device. The light excitation plate surrounds the light emitting device and is made of fluorescent substances. The light excitation plate includes a transparent substrate and a coating layer. The coating layer is coated on the surface of the transparent substrate and includes fluorescent substances.

Description

LIGHTING DEVICE

The embodiment relates to a lighting device, and more particularly, to a lighting device using an LED.

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 are being conducted to replace conventional light sources with light emitting diodes, and the use of light emitting diodes is increasing as a light source for lighting devices such as various lamps, liquid crystal displays, electronic displays, and street lamps that are used indoors and outdoors. .

The embodiment provides a lighting device having a new structure that can replace conventional lighting.

In addition, the embodiment provides a lighting device that can implement the emotional lighting.

In addition, the embodiment provides a lighting apparatus that can improve the optical excitation efficiency.

Illumination apparatus according to the embodiment, the radiator; A substrate disposed on the heat sink and having at least one light emitting element; And an optical excitation plate disposed to surround the light emitting device, the photoexcitation plate having at least one phosphor, and convex upward.

In another embodiment, a lighting apparatus includes: a substrate on which at least one light emitting device is disposed; A bulb surrounding the substrate; And an optical excitation plate disposed between the substrate and the bulb and comprising a polymer substrate having one or more phosphors.

An embodiment of the present invention provides a lighting device having a new structure that can replace conventional lighting.

In addition, there is an advantage that can increase the heat dissipation performance.

In addition, there is an advantage that can implement the emotional lighting.

In addition, the embodiment has an advantage that can improve the optical excitation efficiency.

1 is a perspective view of a lighting apparatus according to an embodiment of the present invention,
2 is a cross-sectional view of the lighting device shown in FIG.
3 is a sectional perspective view and a partially enlarged view of a light excitation plate used in the lighting apparatus shown in FIG. 1;
4 is another embodiment of the optical excitation plate shown in FIG.
5 is a view for explaining a manufacturing method of the optical excitation plate shown in FIG.
6 is an actual photograph of an optical excitation plate manufactured according to the fabrication method shown in FIG. 5;
7 is a sectional view of another embodiment of the lighting device shown in FIG.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size of each component does not necessarily reflect the actual size.

In the description of the embodiment according to the present invention, when one element is described as being formed on the "on or under" of another element, (On or under) includes both the two elements are in direct contact with each other (directly) or one or more other elements are formed indirectly formed (indirectly) between the two elements. In addition, when expressed as “on” or “under”, it may include the meaning of the downward direction as well as the upward direction based on one element.

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

1 is a perspective view of a lighting device according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the lighting device shown in FIG.

1 and 2, a lighting device according to an exemplary embodiment of the present disclosure includes a heat sink 110, a substrate 120, a light emitting element 125, an optical excitation plate 130, a bulb 140, and a socket. The unit 150 and the power supply unit 160 may be included. Hereinafter, each component will be described.

The radiator 110 is disposed on the substrate 120 having the light emitting device 125 thereon. The heat radiator 110 receives the heat generated from the light emitting device 125 and emits the heat.

The heat sink 110 has a circular surface on which the substrate 120 is disposed. In addition, the heat sink 110 accommodates the power supply unit 160 inside. The heat sink 110 preferably has a hole 115 for the wire 165 to electrically connect the substrate 120 and the power supply unit 160 to pass therethrough.

In order to increase the heat dissipation area, the outer surface of the heat dissipator 110 may further include a plurality of heat dissipation fins (not shown) extending outward.

The radiator 110 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 110 may include at least one of aluminum (Al), nickel (Ni), copper (Cu), silver (Ag), and tin (Sn).

In addition, although not shown in the drawings, a heat sink may be disposed between the substrate 120 and the heat sink 110. The heat sink may be formed of a heat conductive silicon pad or a heat conductive tape having excellent thermal conductivity, and may effectively transfer heat generated by the light emitting device 125 to the heat sink 110.

The substrate 120 is disposed on the heat sink 110. A plurality of light emitting devices 125 are disposed on the substrate 120.

The substrate 120 may have a circuit pattern printed on the insulator. For example, it may be any one of a printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, etc., but is preferably an LED chip not packaged on the printed circuit board. COB (Chips On Board) type that can be bonded directly is good.

The substrate 120 may be a material that efficiently reflects light or may have a color, for example, white or silver, on which the surface of the substrate is efficiently reflected.

At least one light emitting device 125 is disposed on the substrate 120.

The plurality of light emitting devices 125 may be disposed radially on the substrate 120 to efficiently emit heat generated when the lighting device is operated.

Each of the plurality of light emitting elements 125 may be a light emitting diode (LED). The light emitting diodes may be red, green, blue, or white light emitting diodes emitting red, green, blue, or white light, respectively, but are not limited thereto.

The photoexcitation plate 130 is disposed to surround the light emitting element 125 and has at least one phosphor. In addition, the light excitation plate 130 is convex upward. Preferably, the photoexcitation plate 130 may have a shape that is almost a hemispherical shape.

The photoexcitation plate 130 excites light of a specific color emitted from the light emitting element 125. For example, when the light emitted from the light emitting element 125 is blue light, the light excitation plate 130 may change the blue light to white light. More specifically, the optical excitation plate 130 will be described with reference to FIG. 3.

3 is a cross-sectional perspective view and a partially enlarged view of a light excitation plate 130 used in the lighting apparatus shown in FIG. 1.

Referring to FIG. 3, the light excitation plate 130 may include a transparent substrate 131 and a coating layer 133.

The transparent substrate 131 is preferably a resin that can transmit light emitted from the light emitting element 120. For example, the transparent substrate 131 may be formed of polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Acrylic resin, polystyrene (Polystyrene, PS) may be any one from the group consisting of. In particular, when heat resistance and chemical resistance of the transparent substrate 131 are required, the transparent substrate 131 may be polycarbonate (PC).

The transparent substrate 131 may diffuse light as well as transmit light. For example, the transparent substrate 131 may be a transparent diffuser plate or a transparent substrate including a diffusing agent. Here, the diffusing agent is, for example, silicon oxide (SiO 2), titanium oxide (TiO 2), zinc oxide (ZnO), barium sulfate (BaSO 4), calcium carbonate (CaSO 4), magnesium carbonate (MgCO 3), aluminum hydroxide (Al ( OH) 3), synthetic silica, glass beads, diamond, but may include at least one. In addition, the particle size of the diffusion agent may be selected to a size suitable for the diffusion of light, for example, may have a diameter of 5 ~ 7μm.

The coating layer 133 is coated on the surface of one surface of the transparent substrate 131. The coating layer 133 may be formed of at least one of a resin material and a silicon material, and preferably, a silicone resin.

The coating layer 133 has at least one phosphor 135. The phosphor 135 excites the light emitted from the light emitting device 120. The phosphor 135 may be included in the coating layer 133 by being mixed with the liquid coating layer 133 and stirred using a stirrer, for example.

The phosphor 135 may include, for example, at least one of a silicate series, a sulfide series, a YAG series, a TAG series, and a Nitride series.

The phosphor 135 may include at least one or more of yellow, red, green, and blue phosphors emitting yellow, red, green, and blue light, but is not limited to the type of the phosphor.

Meanwhile, CaS: Eu may be used as a representative sulfide-based inorganic phosphor for emitting deep red light. As the orange phosphor, at least one of sulfide-based SrS: Eu and MgS: Eu may be used. As the green phosphor, sulfide-based SrGa 2 S 4 and Eu 2+ may be used.

The phosphor 135 may be included in the coating layer 133 in a different kind and amount depending on the light emitting device 120. For example, when the light emitting device 120 emits white light, the coating layer 133 may include green and red phosphors. In addition, when the light emitting device 120 emits blue light, the coating layer 133 may include green, yellow, and red phosphors. As such, the type and amount of the phosphor 135 included in the coating layer 133 may vary depending on the type of the light emitting device 120.

On the other hand, the coating layer 133 may further include at least one or more of a diffusing agent, an antifoaming agent, an additive, a curing agent.

The diffusion agent may be diffused by scattering light incident on the coating layer 133. Examples of the diffusion agent include silicon oxide (SiO 2), titanium oxide (TiO 2), zinc oxide (ZnO), barium sulfate (BaSO 4), calcium carbonate (CaSO 4), magnesium carbonate (MgCO 3), aluminum hydroxide (Al (OH)). 3), but may include at least one of synthetic silica, glass beads, diamond.

The antifoaming agent can secure reliability by removing bubbles in the coating layer 133. In particular, it is possible to solve the problem of bubbles when applying the coating layer 133 on the transparent substrate 131 by the screen printing method. Examples of the antifoaming agent may include, but are not limited to, at least one of octanol, cyclohexanol, ethylene glycol, or various surfactants.

The curing agent may cure the coating layer 133.

The additive may be used to evenly distribute the phosphor 135 in the coating layer 133.

Meanwhile, the coating layer 133 may include a layer having a red phosphor, a layer having a green phosphor, and a layer having a yellow phosphor, in addition to mixing various kinds of phosphors. For example, the coating layer 133 may include at least one of a first coating film having a yellow phosphor, a second coating film having a red phosphor, and a third coating film having a blue phosphor. That is, one or more different coating films may be disposed for each phosphor to form the coating layer 133.

The light excitation plate 130 changes the wavelength of light emitted from the light emitting element 120. Therefore, the optical excitation plate 130 is applied to light sources such as various lighting devices, backlight units, light emitting devices, and display devices, and used to generate light having various wavelengths, or the color rendering index (CRI) of the light source. It can be used for such purposes as improving the.

In addition, the optical excitation plate 130 may be a polymer diffusion plate containing a phosphor. It will be described in detail with reference to the drawings.

FIG. 4 is another embodiment of the optical excitation plate 130 shown in FIG. 1.

Referring to FIG. 4, the optical excitation plate 130 may be a single substrate made of a polymer, and may include a predetermined phosphor 135. Since the phosphor 135 included in the polymer substrate 130 is the same as the phosphor 135 described above with reference to FIG. 3, the detailed description thereof will be replaced with the above description. As illustrated in FIG. 5, the polymer substrate 130 may be manufactured using a metal injection molding method by mixing plastic and green / red phosphors. Here, the polymer substrate 130 may be manufactured by further mixing a diffusion agent as additives. Here, examples of the diffusion agent include silicon oxide (SiO 2), titanium oxide (TiO 2), zinc oxide (ZnO), barium sulfate (BaSO 4), calcium carbonate (CaSO 4), magnesium carbonate (MgCO 3), and aluminum hydroxide (Al (OH). 3), synthetic silica, glass beads, diamond may include at least one, but is not limited thereto.

The polymer substrate made through the fabrication method shown in FIG. 5 is the same as that shown in FIG. 6. The photoexcitation plate 130 as shown in FIGS. 1 to 4 may be manufactured by applying heat to the polymer substrate thus manufactured.

On the other hand, Figure 7 is a cross-sectional view of another embodiment of the lighting device shown in FIG.

In the lighting apparatus according to another embodiment of the present invention illustrated in FIG. 7, the arrangement of the optical excitation plate 130 is different from that of the optical excitation plate 130 of the lighting apparatus illustrated in FIG. 2. Since the rest of the configuration is the same as the lighting apparatus shown in FIG. 2, detailed description thereof will be omitted.

Referring to FIG. 7, an outer portion 137 of the light excitation plate 130 is disposed on the substrate 120. That is, the outer portion 137 is in contact with the substrate 120.

2, when the outer portion of the optical excitation plate 130 is in contact with the heat sink 110, the optical excitation plate 130 is driven by the heat of the heat sink 110 when the light emitting device 120 is driven. May be deformed.

In order to prevent this, as shown in FIG. 7, the outer portion 137 of the optical excitation plate 130 is preferably disposed on the substrate 120.

The bulb 140 is disposed on the light excitation plate 130 and is fastened to the heat sink 110. The bulb 140 protects the substrate 120, the light emitting device 125, and the light excitation plate 130 from the outside.

The inner surface of the bulb 140 may be coated with a milky paint. The paint may include a diffusing agent to diffuse light passing through the bulb 140.

Although the material of the bulb 140 may be glass, it is preferable to use plastic, polypropylene (PP), polyethylene (PE), or the like, because there is a weak problem in weight or external impact. More preferably, polycarbonate (PC) or the like having good light resistance, heat resistance, and impact strength properties may be used.

The socket part 150 is disposed below the heat sink 110. The socket part 150 is electrically connected to an external power source. The socket part 150 may be integral with the heat sink 110 or may be coupled to the heat sink 110.

The power supply unit 160 is housed inside the heat sink 110. The power supply unit 160 serves to transform and transmit power from the outside to the light emitting device 120.

The power supply unit 160 may be composed of 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 AC power provided from an external power source into DC power, a driving chip for controlling driving of the light emitting device 120, and an ESD protection for the light emitting device 120. (ElectroStatic discharge) protection element and the like, but may not be limited thereto.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

110: heat sink
120: substrate
125: light emitting element
130: optical excitation plate
140: bulb
150: socket
160: power supply

Claims (12)

Heat sink;
A substrate disposed on the heat sink and having at least one light emitting element; And
An optical excitation plate disposed to enclose the light emitting element, the photoexcitation plate having at least one phosphor and convex upward;
Lighting device comprising a.
The method of claim 1, wherein the optical excitation plate,
A transparent substrate; And
A coating layer coated on a surface of the transparent substrate and including the phosphor;
Lighting device comprising a.
The method of claim 1, wherein the optical excitation plate,
Polymer substrates; And
An illumination device comprising the phosphor contained in the polymer substrate.
The method of claim 3, wherein
And the polymer substrate further comprises a diffusing agent.
The method of claim 2,
And the transparent substrate diffuses the light.
The method of claim 2,
The coating layer is a lighting device comprising at least one or more of a diffusing agent, an antifoaming agent, an additive, a curing agent.
The method of claim 2, wherein the coating layer,
An illumination device comprising at least one of a first coating film having a yellow phosphor, a second coating film having a red phosphor, and a third coating film having a blue phosphor.
The method according to claim 1 or 3,
The phosphor is at least any one of yellow, red, green and blue phosphor.
The method of claim 1,
An outer portion of the optical excitation plate is disposed on the substrate.
The method of claim 1,
The light excitation plate is a hemispherical light device.
A substrate on which at least one light emitting element is disposed;
A bulb surrounding the substrate; And
An optical excitation plate disposed between the substrate and the bulb and comprising a polymer substrate having one or more phosphors;
Lighting device comprising a.
11. The method of claim 10,
The polymer substrate includes at least one of a diffusing agent, an antifoaming agent, an additive, a curing agent.

Images