KR20120057262A - Phosphor coating matrix and lighting device - Google Patents

Abstract

PURPOSE: A photo-excited plate and a lighting device are provided to improve photo-excited efficiency by containing a fluorescent substance in a fluorescent material layer and exciting light entered from outside. CONSTITUTION: A base plate(110) transmits light. A lens(130) is arranged at one side of the base plate. The lens comprises a first fluorescent substance(135). A first fluorescent material layer(150) is arranged at the other side of the base plate. The first fluorescent material layer comprises a second fluorescent substance(155). A second fluorescent material layer(170) comprises a third fluorescent substance(175). The base plate comprises a diffusing material capable of diffusing the light. The diameter of the diffusing material is 5 to 7micrometers.

Description

Optical excitation plate and lighting device {PHOSPHOR COATING MATRIX AND LIGHTING DEVICE}

Embodiments of the present invention relate to an optical excitation plate and a lighting device, and more particularly, to an optical excitation plate used in LED (Light Emitting Diode) lighting and a lighting device using the same.

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 the existing light sources with light emitting diodes, and the light emitting diodes are increasingly used as light sources for light units such as various lamps, display devices, electronic signs, and street lamps that are used indoors and outdoors.

An embodiment of the present invention provides a light excitation plate and a lighting device having a new structure.

In addition, there is provided an optical excitation plate and an illumination device capable of improving the optical excitation efficiency.

In addition, the present invention provides an optical excitation plate and an illumination device capable of improving the luminous flux and color rendering index.

In addition, there is provided an optical excitation plate and an illumination device capable of improving the uniformity of light.

Optical excitation plate according to an embodiment of the present invention, the base plate for transmitting light; A lens disposed on one surface of the base plate and having a first phosphor; A first phosphor layer disposed on the other surface of the base plate and having a second phosphor; And a second phosphor layer disposed adjacent to the lens on one surface of the base plate and having a third phosphor.

Illumination apparatus according to an embodiment of the present invention, the light emitting module having at least one light emitting element; A case having a light transmitting surface through which light generated from the light emitting element is transmitted; And a light excitation plate spaced apart from the light emitting module at a predetermined interval, the light excitation plate comprising: a base plate transmitting light; A plurality of lenses disposed on one surface of the base plate and having a first phosphor; A first phosphor layer disposed on the other surface of the base plate and having a second phosphor; And a second phosphor layer disposed adjacent to the lens on one surface of the base plate and having a third phosphor.

Using the optical excitation plate and the lighting device of the new structure according to the embodiment of the present invention, there is an advantage that can improve the optical excitation efficiency.

In addition, there is an advantage that can improve the luminous flux and color rendering index.

In addition, there is an advantage that can improve the uniformity of light.

1 is a perspective view of an optical excitation plate according to an embodiment of the present invention,
2 is a cross-sectional view of the optical excitation plate shown in FIG.
3 to 6 are views for explaining one method of manufacturing the optical excitation plate shown in FIG.
7 to 8 are perspective views for explaining the lighting device having the light excitation plate shown in Figs.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Also, the size of each component does not necessarily reflect its 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, an optical excitation plate according to an embodiment of the present invention will be described with reference to the accompanying drawings.

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

1 to 2, the light excitation plate 100 according to an embodiment of the present invention excites light incident from the outside. The optical excitation plate 100 includes a base plate 110, a plurality of lenses 130, and first and second phosphor layers 150 and 170.

The base plate 110 is preferably a polymer plate that can transmit light. For example, polycarbonate (PC), light guide plate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic resin, polystyrene (PS), polymethyl methacrylate ( Polymethyl methacrylate, PMMA) may be any one from the group consisting of. In particular, when heat resistance and chemical resistance of the base plate 110 is required, the base plate 110 is preferably polycarbonate (PC).

The base plate 110 may diffuse light as well as transmit light. For example, the base plate 110 may be a translucent diffuser plate or a translucent substrate including a diffuser. Here, the diffusion agent, for example, silicon oxide (SiO2), titanium oxide (TiO2), zinc oxide (ZnO), barium sulfate (BaSO4), calcium carbonate (CaSO4), magnesium carbonate (MgCO3), aluminum hydroxide (Al (OH) 3), synthetic silica, glass beads, and 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 lens 130 may be disposed in plural on one surface of the base plate 110, or may protrude in plural from one surface of the base plate 110. That is, when the lens 130 is formed separately from the base plate 110 and attached to the base plate 110, the lens 130 may be regarded as being disposed on the base plate 110, and the lens 130 may be disposed on the base plate 110. When formed integrally with the 110 can be seen to protrude outwards from one surface of the base plate (110).

In the figure, the lens 130 is shown in a hemispherical shape, but is not limited thereto. That is, the lens 130 may have a hemispherical shape as well as a polygonal pyramid or a polygonal pillar. As used herein, the hemispherical shape includes not only a perfect hemisphere but also a shape having a predetermined curvature as shown in the drawing.

In addition, although the lens 130 is shown in an embossed form in the drawings, it should be noted that the present invention is not limited thereto and may be implemented in an engraved form.

The lens 130 is preferably made of plastic. In particular, the plastic material is preferably a resin. In addition, the resin is preferably a UV resin curable with UV (Ultra Violet). In addition, the lens 110 may be any one of acrylic resin, silicone resin, and urethane resin as well as UV resin.

The lens 130 has a first phosphor 135. The first phosphor 135 is evenly distributed within the lens 130. The first phosphor 135 excites light incident from the outside. Description of the first phosphor 135 will be described later.

The first phosphor layer 150 is disposed on the other surface of the base plate 110. The first phosphor layer 150 may be formed of at least one of a resin material and a silicon material, and preferably, may be silicon resin.

The first phosphor layer 150 has a second phosphor 155. The second phosphor 155 is evenly distributed within the first phosphor layer 150. The second phosphor 155 excites light incident from the outside. The second phosphor 155 will also be described later.

The second phosphor layer 170 is disposed adjacent to the lens 130 on one surface of the base plate 110. The second phosphor layer 170 is disposed between the plurality of lenses 130 so as not to cover the lens 130. Like the first phosphor layer 170, the second phosphor layer 170 may be formed of at least one of a resin material and a silicon material, and preferably, may be a silicone resin.

The second phosphor layer 170 has a third phosphor 175. The third phosphor 175 is evenly distributed within the second phosphor layer 170. The third phosphor 175 excites incident light. Hereinafter, the first to third phosphors 135, 155, and 175 will be described together.

The first to third phosphors 135, 155, and 175 may be, for example, at least one of silicate series, sulfide series, YAG series, TAG series, and Nitride series.

The first to third phosphors 135, 155, and 175 may include at least one or more of yellow, red, green, and blue phosphors that emit yellow, red, green, and blue light, but are limited to the kind thereof. I do not. 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.

Different types and amounts of the first to third phosphors 135, 155, and 175 may be included in the lens 130 and the first and second phosphor layers 150 and 170, respectively, according to light sources. For example, when the light source is a white light source, the first to third phosphors 135, 155, and 175 may be green and red phosphors. In addition, when the light source is a blue light source, the first to third phosphors 135, 155, and 175 may be green, yellow, and red phosphors. As such, the type and amount of the first to third phosphors 135, 155, and 175 may vary depending on the type of the light source, but is not limited thereto.

The first phosphor 135, the second phosphor 155, and the third phosphor 175 may be the same phosphors, but preferably different phosphors. For example, the first phosphor 135 may be a yellow phosphor, the second phosphor 155 may be a red phosphor, and the third phosphor 175 may be a green phosphor. If the first phosphor 135 is a yellow phosphor, the second phosphor 155 is a red phosphor, and the third phosphor 175 is a green phosphor, dispersion of the optical excitation plate 100 may be increased. If two or more of the yellow, red and green phosphors are mixed together in either the lens 130 or the first and second phosphor layers 150 and 170, the phosphors are well-balanced due to the difference in specific gravity between the yellow, red and green phosphors. It is not distributed. However, since the optical excitation plate 100 according to the embodiment of the present invention has the lens 130 and the first and second phosphor layers 150 and 170 and each has different phosphors, the dispersion degree is improved. There is an advantage. In addition, when the first to third phosphors 135, 155, and 175 are different from each other, there is an advantage in that the optical excitation efficiency is high.

Here, the first phosphor 135 may further include not only a yellow phosphor but also a green phosphor. When the first phosphor 135 further includes a green phosphor, optical characteristics such as color rendering index may be improved. In this case, since the yellow phosphor and the green phosphor have different specific gravity, they may not be mixed well. Therefore, the lens 130 may have a first coating film having a yellow phosphor and a second coating film having a green phosphor.

When the plurality of lenses 130 and the second phosphor layer 170 are disposed on one surface of the base layer 110, and the first phosphor layer 150 is disposed on the other surface of the base layer 110, warpage of the optical excitation plate 100 is performed. Can be prevented. For example, when an optical excitation plate having a plurality of lenses or phosphor layers disposed on only one surface of the base plate 110 is installed and used on a light source, stress is generated by heat caused by the light source, The optical excitation plate can bend. However, in the optical excitation plate 100 according to the embodiment of the present invention, since the lens 130, the second phosphor layer 170, and the first phosphor layer 150 are disposed on both surfaces of the base plate 110, The warpage phenomenon by the heat from can be prevented.

The lens 130 and the first and second phosphor layers 150 and 170 may further include at least one or more of a diffusing agent, an antifoaming agent, an additive, and a curing agent.

The diffusing agent may diffuse by scattering light incident on the lens 130 or the first and second phosphor layers 150 and 170. 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 may secure reliability by removing bubbles in the lens 130 or the first and second phosphor layers 150 and 170. 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 easily cure the lens 130 or the first and second phosphor layers 150 and 170 when the optical excitation plate 100 is manufactured according to the embodiment of the present invention.

The additive may be used to evenly distribute the first to third phosphors 135, 155, and 175 in the lens 130 and the first and second phosphor layers 150 and 170.

On the other hand, in the optical excitation plate 100 according to an embodiment of the present invention, the base plate 110 and the lens 130 are configured separately, respectively, the first and second phosphor layers 150, 170 By combining, the optical excitation plate 100 may be formed. Alternatively, the base plate 110 and the lens 130 may be integral with each other, and the first and second phosphor layers 150 and 170 may be combined to form the optical excitation plate 100. The optical excitation plate 100 including the base plate 110, the lens 130, and the first and second phosphor layers 150 and 170 may be called PMLA (Phosphor Micro Lens Array).

The optical excitation plate 100 according to the embodiment of the present invention has a lens 130 having a first phosphor 135 and one surface of the base plate 110 in an array form on the optical excitation plate 100 in a hemispherical shape. The first phosphor layer 150 having a second phosphor is arranged on the other side of the base plate 110, and the second phosphor layer 170 having the third phosphor is the base plate 110. It is placed on one side of. Therefore, the optical excitation plate 100 hardly causes warpage. In addition, since the degree of dispersion is high, the light excitation efficiency is high, and the luminous flux and the color rendering index can be improved. In addition, the uniformity of light can be improved.

3 to 6 are views for explaining one method of manufacturing the optical excitation plate 100 shown in FIG.

First, referring to FIG. 3, a master mold having a hole corresponding to the lens 130 of the optical excitation plate 100 illustrated in FIG. 1 is prepared. The shape of the hole becomes the shape of the lens 130.

The base plate 110 is prepared, and the lens layer 130 to be the lens 130 is formed on the base plate 110 later. Here, the lens layer 130 includes the first phosphor 135 shown in FIG. 2. That is, the lens layer 130 may be formed in the liquid phase on the base plate 110 in a form in which the resin and the first phosphor 135 are mixed.

Next, referring to FIG. 4, the lens layer 130 and the master mold are brought into close contact with each other, and a predetermined pressure is applied to the master mold and the base plate 100 so that the master mold and the base plate 110 are pressed together. . According to this process, as shown in FIG. 5, the liquid lens layer 130 is inserted into the hole of the master mold. Thereafter, the lens layer 130 is cured by irradiating a UV light source.

After all the UV curing process is completed, as shown in FIG. 6, the base plate 110 and the lens 130 are released from the master mold.

Next, the first phosphor layer 150 is formed on the other surface of the base plate 110. Here, the first phosphor layer 150 may be coated on the other surface of the base plate 110 so that the second phosphor 155 is evenly distributed on the first phosphor layer 150.

In addition, the second phosphor layer 170 is formed on one surface of the base plate 110. In this case, it is preferable to form the second phosphor layer 170 so that the second phosphor layer 170 does not cover all of the lenses 130.

Through the processes illustrated in FIGS. 3 to 6, the optical excitation plate 100 according to the embodiment of the present invention may be manufactured.

7 to 8 are perspective views for explaining the lighting device having the light excitation plate shown in Figs. Specifically, FIG. 7 is a perspective view of a lighting apparatus according to an exemplary embodiment of the present invention, and FIG. 8 is a perspective view when the optical excitation plate is removed from the lighting apparatus illustrated in FIG. 7.

7 to 8, a lighting apparatus according to an embodiment of the present invention may include a light excitation plate 100, a case 200, and a light emitting module 300.

The optical excitation plate 100 is the optical excitation plate 100 shown in FIGS. 1 to 2. Therefore, detailed description of the optical excitation plate 100 will be omitted. The light excitation plate 100 excites the light emitted from the light emitting element of the light emitting module 300.

The case 200 accommodates the optical excitation plate 100 and the light emitting module 300. In detail, the light emitting module 300 is disposed on the bottom surface of the case 200, and the light excitation plate 100 is disposed on the light transmitting surface of the case 200. The case 200 receives heat generated from the light emitting module 300 and radiates heat. Therefore, the case 200 is preferably made of aluminum and its alloy having high heat conduction and excellent heat dissipation.

The light transmitting surface of the case 200 is a surface through which light from the light emitting device of the light emitting module 300 is transmitted.

The light emitting module 300 is disposed on the bottom surface of the case 200. The light emitting module 300 has a light emitting device such as a light emitting diode and a substrate on which a plurality of the light emitting devices are disposed.

The light emitting module 300 and the optical excitation plate 100 accommodated in the case 200 may be disposed to be spaced apart from each other by a predetermined interval.

The inner side surface of the case 200 may be a predetermined reflective surface as shown in FIG. 8. Therefore, the inner side surface of the case 200 reflects the light emitted from the light emitting module 300 to the light transmitting surface.

The wire 400 penetrates the case 200 and is electrically connected to the light emitting module 300. The wire 400 supplies external power to the light emitting module 300.

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.

100: photoexcitation plate
110: base plate
130: lens
135: first phosphor
150: first phosphor layer
155: second phosphor
170: second phosphor layer
175: third phosphor
200: case
300: light emitting module

Claims (14)

A base plate for transmitting light;
A lens disposed on one surface of the base plate and having a first phosphor;
A first phosphor layer disposed on the other surface of the base plate and having a second phosphor; And
A second phosphor layer disposed adjacent to the lens on one surface of the base plate and having a third phosphor;
Optical excitation plate comprising a.
The method of claim 1,
And the lens is arranged in plurality on one surface of the base plate.
The method of claim 1,
The lens is a UV resin cured by UV, wherein the UV resin is any one of acrylic, silicone and urethane-based optical excitation plate.
The method of claim 1,
The base plate is an optical excitation plate comprising a diffusing material having a diameter of 5 ~ 7μm to diffuse the light.
The method of claim 1,
And the lens or the first and second phosphor layers have at least one or more of a diffusing agent, an antifoaming agent, an additive, and a curing agent.
The method of claim 1,
And the first to third phosphors have at least one of yellow, green and red phosphors.
The method of claim 1,
And the first to third phosphors are different from each other.
The method of claim 7, wherein
Wherein said first phosphor is a yellow phosphor, said second phosphor is a red phosphor, and said third phosphor is a green phosphor.
The method of claim 8,
And an amount of said yellow phosphor is greater than an amount of said red phosphor.
The method of claim 1,
The lens is at least one of the lens of the hemispherical, polygonal columnar, polygonal pyramidal, the shape of the upper side has a plurality of bends.
A light emitting module having at least one light emitting element;
A case having a light transmitting surface through which light generated from the light emitting element is transmitted; And
A light excitation plate spaced apart from the light emitting module at a predetermined interval,
The optical excitation plate is a base plate for transmitting light;
A plurality of lenses disposed on one surface of the base plate and having a first phosphor;
A first phosphor layer disposed on the other surface of the base plate and having a second phosphor; And
And a second phosphor layer disposed adjacent to the lens on one surface of the base plate and having a third phosphor.
The method of claim 11,
The first to third phosphors are different from each other.
The method of claim 12,
Wherein the first phosphor is a yellow phosphor, the second phosphor is a red phosphor, and the third phosphor is a green phosphor.
The method of claim 11,
The inner side of the case is a reflective surface.

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