KR101571152B1 - Led lighting apparatus - Google Patents

Abstract

An LED lighting apparatus according to an embodiment of the present invention includes: at least one LED module which irradiates a light by being applied with electricity from the outside through a connection port; an optical diffusion lens which comprises an aspherical surface comprising a symmetric structure on an X-axis and an asymmetric structure on an Y-axis, and comprises a light incident inner plane for focusing an emitted light of the LED module through a curvature of a concave shape as to a normal direction where the emitted light of the LED module is incident, and a light emitting outer plane for distributing the emitted light of the LED module uniformly over the whole area of a target area by diffusing the light focused by the light incident inner plane; and a cylindrical diffuser which has the LED module and the optical diffusion lens at both side ends, and diffuses the output light from the optical diffusion lens.

Description

LED LIGHTING APPARATUS [0001]

Embodiments of the present invention relate to a lighting apparatus, and more particularly to an LED lighting apparatus.

It is known that 70% of the information experienced in everyday life is acquired through vision, and the color of the perceived object greatly influences the emotion of the person through the eyes, and the person recalls the memories of the past through the specific color , And some emotions are caused to him. Therefore, it is known that the illumination that can determine the color of the object in everyday life is very important for the emotion of the person, and the lighting environment directly affects the fatigue of the worker because it can change the brain wave of the worker.

In a conventional incandescent lamp or a fluorescent lamp, which is a typical illuminator, there is a phenomenon that a visibility line drifts during light emission, the focal point is blurred and fatigue of a user's eye is largely affected. In severe cases, A lamp or a lamp which is realized by an LED having various effects as compared with an incandescent lamp or a fluorescent lamp has been developed and sold.

Light emitting diodes (LEDs) are light emitting diodes (LEDs) that emit light. They emit light of various colors such as red, green, blue, and yellow. In general, a light emitting diode (LED) has a pn junction structure. When a forward current is applied to a diode, electrons in the n region of the chip are accelerated by the electric field and move to the p region. In the p region, the state of the acceptor or valence band And recombines with holes, and light having an energy corresponding to the potential difference is emitted according to the material of the chip. This phenomenon is referred to as an injection type electroluminescence. Such a device is called an LED. GaAs, GaAsP, GaP, GaAlAs, SiC, and the like are typical materials of such LED chips, and they exhibit various luminescent characteristics from the crystal structure of these materials.

The illumination device implemented by LED requires only about 10% of power consumption compared with the conventional illumination device implemented by an incandescent lamp, and consumes only about 50% of power consumption compared with the conventional illumination device implemented by a fluorescent lamp. The LED illumination device not only minimizes eye fatigue even when used for a long time, but also has a life span that is about 10 times longer than an incandescent lighting device and about 8 times longer than a fluorescent lighting device.

A tube-type fluorescent light alternative to direct-LED-based LED lighting requires that the PCB be designed to place multiple LEDs directly underneath the backside and a thick diffuser to eliminate spotting. In addition, there is a heating problem due to the built-in SMPS inside, and there is a mechanical and electrical problem due to the heavy weight due to the PCB or the photoluminescence machine due to the time lapse.

In addition, as the PCB is mounted on the backside, the irradiation angle stays at a level of 120 degrees, and there is a problem that the light efficiency is lowered as a whole because there is no effect of using the reflector as compared with a fluorescent lamp having a 360 degree irradiation angle.

In order to solve such a problem, a method of irradiating light with a power LED on the side of a diffuser is being studied. However, although the LED modules provided on both sides of the diffuser are irradiated with light toward the central portion, the light is not fully transferred to the central portion, resulting in a problem that the intensity of light on both sides and the center portion is changed.

Related prior arts are disclosed in Japanese Unexamined Patent Application Publication No. 2004-0071707 (entitled " Illumination system and display device, published on Aug. 12, 2004).

An embodiment of the present invention provides an LED illumination device that enables adjustment of light emission in all directions by controlling all directional light adjustment in the X-axis direction and the Y-axis direction through a light diffusion lens.

In one embodiment of the present invention, an expansion plate having a reflection plate and a diffusion polygonal pyramid plate is inserted and disposed in a diffuser, thereby diffusing the divergent light of the LED module passing through the light diffusion lens into a certain angle direction and diffusing it to maximize light transmission A 360 degree illumination angle).

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided an LED lighting device including at least one LED module that receives power from an external source through a connection terminal and emits light; And an aspherical surface having an asymmetric structure on the Y axis, wherein the divergent light of the LED module is condensed through a curved surface concaved with respect to a normal direction in which the divergent light of the LED module is incident And a light outgoing outer surface that diffuses the light condensed by the light incidence inner surface and uniformly distributes the divergent light of the LED module to the entire area of the target area; And a cylindrical diffuser in which the at least one LED module and the light diffusion lens are disposed at both ends and diffuses light emitted from the light diffusion lens.

The light incidence inner surface of the light diffusion lens may be determined as either an ellipse or a hyperbola based on the aspheric curvature value, the conic constant, and the aspheric surface coefficient.

The LED illumination device according to an embodiment of the present invention includes a reflection plate formed to be flat in the longitudinal direction of the diffuser, and a diffusing polygonal mirror having a plurality of inclined surfaces coupled to each other in the form of a polygonal pyramid on the upper surface of the reflection plate, And a diffusing plate for diffusing the light emitted from the light diffusing lens into the diffuser by switching the light emitted from the light diffusing lens in a predetermined angle direction with respect to the longitudinal direction of the diffuser.

The reflector is a white opaque reflective film made of a white opaque synthetic resin. The white opaque synthetic resin is a synthetic resin having a white color due to mixing of white pigment or dispersion of fine bubbles. The synthetic resin for producing the reflector is polyethylene terephthalate, polyethylene naphthalate Wherein the white pigment is at least one selected from the group consisting of acrylic resin, polycarbonate, polystyrene, polyolefin, cellulose acetate, polyvinyl chloride, and the white pigment is at least one selected from the group consisting of titanium oxide, silicon oxide, zinc oxide, lead carbonate, barium sulfate, Aluminum, and the like.

The LED illumination device according to an embodiment of the present invention includes a wavelength conversion material formed in a spiral shape in the longitudinal direction of the diffuser in the diffuser and adapted to convert the wavelength of the outgoing light from the optical diffusion lens, Transmissive fiber that allows light passing through the open space of the light guide plate to be converted into light of another color through the wavelength conversion material.

The LED illumination apparatus according to an embodiment of the present invention adjusts the degree of compression of the spiral light transmitting fiber to change the size of the spiral open space so that the color of the light emitted from the light diffusion lens and the color of the light transmitting fiber And a compression adjusting unit adjusting the ratio of the color of the light converted by the light source.

The LED lighting apparatus according to an embodiment of the present invention may further include a heat dissipation cover disposed on a rear surface of the LED module and discharging or dispersing heat generated from the LED module to the outside, A plurality of heat dissipation units; And a plurality of heat dissipation fins formed on the outer circumferential surface of the heat dissipation body to increase the heat dissipation area.

The heat radiating cover may further include a sub heat sink having a cylindrical shape having a diameter smaller than the diameter of the heat radiating main body, and a plurality of heat radiating fins accommodated in the heat radiating main body and having a plurality of radiating fins formed on an inner peripheral surface thereof at regular intervals.

The LED illumination apparatus according to an embodiment of the present invention may further include a hardness enhancing layer formed on an outer circumferential surface of the diffuser for enhancing hardness of the diffuser, wherein the hardness enhancing layer comprises 100 parts by weight of tetramethylolmethane tetraacrylate 15 to 35 parts by weight of hydroxyethylhydroxypropylcellulose, 10 to 20 parts by weight of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, ethyl 2- [3- Benzo [d] thiazol-2-yl) ureido] acetate in an amount of 7 to 15 parts by weight.

The details of other embodiments are included in the detailed description and the accompanying drawings.

According to an embodiment of the present invention, all directional light adjustment in the X-axis direction and the Y-axis direction is controlled through the light diffusion lens, thereby enabling adjustment of light radiation in all directions.

According to an embodiment of the present invention, an extension plate having a reflection plate and a diffusion polygonal pyramid is disposed inside a diffuser, thereby diffusing the divergent light of the LED module passing through the light diffusion lens in a certain angle direction to diffuse the light, (Having a 360 degree irradiation angle).

1 is an assembled perspective view of an LED illumination device according to an embodiment of the present invention.
2 is an exploded perspective view of an LED illumination device according to an embodiment of the present invention.
3 is an external perspective view showing the light diffusion lens of FIG.
4 is a front cross-sectional view of the light diffusion lens viewed along the X-axis along the line XX in Fig.
5 is a side cross-sectional view of the light diffusion lens viewed along the Y axis along the YY line in Fig.
FIGS. 6A and 6B are views showing an embodiment of the diffusion plate of FIG. 2, respectively.
Fig. 7 is a view showing the detailed structure of the heat radiation cover of Fig. 2;
8 is an exploded perspective view illustrating an LED illumination device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an assembled perspective view of an LED illumination apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of an LED illumination apparatus according to an embodiment of the present invention.

1 and 2, an LED illumination device 100 according to an exemplary embodiment of the present invention includes an LED module 110, a light diffusion lens 120, a diffuser 130, a diffusion plate 140, (150), and a connection terminal (160).

The LED module 110 may include one or more LED elements. At this time, the LED module 110 may be composed of one power LED device having a high wattage or a plurality of LED devices having a low wattage.

The LED module 110 may be configured in the form of an LED package including a heat dissipation PCB (PCB) and a power module in which an LED device is mounted when the LED device is configured with a high wattage.

Meanwhile, when the LED module 110 is configured with a low wattage, the LED module 110 may be configured so that the PCB on which the one or more LED devices are mounted is directed toward the center of the diffuser 120.

The LED module 110 receives power from the outside through the connection terminal 160 and emits light. The heat radiating cover 150 may be disposed on a rear surface of the LED module 110. The heat radiating cover 150 may be disposed in close contact with the PCB on which the LED device is mounted. The heat radiating cover 150 will be described in detail later.

The light diffusion lens 120 has a symmetrical structure on the X axis and an aspheric surface on the Y axis. The light diffusion lens 120 will be described in more detail with reference to FIGS. 3 to 5. FIG. 3 is a schematic cross-sectional view of the light diffusing lens viewed along the X-axis along line XX in FIG. 3, and FIG. 5 is a cross-sectional view taken along line YY in FIG. 3 Sectional view of the light diffusion lens taken along the Y axis.

3 to 5, the optical diffusion lens 120 is made of a polymer material, and forms an axisymmetric structure on the X axis and an asymmetric structure on the Y axis. The body 410 may be provided with a body 410 as shown in FIG.

The body 410 has a light incident inner surface (not shown) that condenses the divergent light of the LED module 110 through a curved surface of a concave shape with respect to a normal direction in which the divergent light of the LED module 110 is incident, And 430y for diffusing the light condensed by the light incident inner surfaces 420x and 420y and uniformly distributing the divergent light of the LED module 110 to the entire area of the target area, ).

Here, the light incident inner surfaces 420x and 420y of the light diffusion lens may be determined to be either an ellipse or a hyperbola based on the aspheric curvature value, the conic constant, and the aspherical surface coefficient.

Specifically, the light incident inner surfaces 420x and 420y have an aspherical curvature radius, a conic constant, and an aspheric coefficient, which can adjust the aspherical curvature value, the conic constant, and the aspherical surface coefficient Indicating that the radiation path and the light distribution can be arbitrarily arbitrarily adjusted with respect to the divergent light of the LED module 110 as the light source and has aspherical surface data for realizing light uniformity .

The rotational symmetry higher order aspherical surface around the optical axis can be expressed by Equation 1 below.

[Equation 1]

That is, Equation 1, which is an aspherical surface equation, is composed of an equation including a conic constant and an aspherical surface coefficient, and becomes a value indicating an aspheric surface shape.

In this case, the aspherical shape can be expressed as a spherical surface if K = 0, an ellipse if -1 K <0, a parabolic surface when K = -1, a hyperbola if K < It is possible to increase the degree of freedom by the aspherical surface and freely design the aspherical shape by adjusting the aspherical surface coefficient. This shows that light adjustment can be performed to adjust the overall light uniformity of the divergent light of the LED module 110, which is a light source, through the light incident inner surfaces 420x and 420y.

The diffuser 130 is disposed at both ends of the LED module 110 and diffuses light passing through the light diffusion lens 120 by the LED module 110. At this time, the diffuser 130 is formed in a cylindrical shape and can diffuse light passing through the light diffusion lens 120 by the LED module 110 in a 360 degree direction.

A hardness enhancing layer (not shown) may be formed on the outer circumferential surface of the diffuser 130 to enhance hardness of the diffuser 130. Wherein the hardness-enhancing layer comprises 15 to 35 parts by weight of hydroxyethylhydroxypropylcellulose, 100 parts by weight of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate 10 to 20 parts by weight, and 7 to 15 parts by weight of ethyl 2- [3- (6-nitrobenzo [d] thiazol-2-yl) ureido] acetate.

The hardness strengthening layer formed on the outer circumferential surface of the diffuser 130 will be described later in more detail through experiments and the like.

The diffuser plate 140 is inserted into the diffuser 130 and irradiated from the LED module 110 so that light passing through the diffuser lens 120 is incident on the diffuser 130 in a predetermined direction It is possible to switch to the angle direction and diffuse it to the diffuser 130.

The diffuser plate 140 includes a sloped surface 141 in which a predetermined position in the longitudinal direction of the diffuser 130 is refracted so that light emitted from the LED module 110 passes through the diffuser 130, In the longitudinal direction and in the constant angle direction. The diffusion plate 140 will be described in detail with reference to FIGS. 6A and 6B. 6A and 6B are views showing an embodiment of the diffusion plate 140 of FIG. 2, respectively.

6A and 6B, the diffusion plate 140 may include a reflection plate 142 and a diffusion polygon mirror plate 143. [

The reflector 142 may be formed flat in the longitudinal direction of the diffuser 130. The reflector 142 is a white opaque reflective film made of a white opaque synthetic resin. The white opaque synthetic resin is a synthetic resin having a white color due to mixing of white pigment or dispersion of minute bubbles. The synthetic resin for producing the reflector is polyethylene terephthalate, Wherein the white pigment is one selected from the group consisting of polyethylene naphthalate, acrylic resin, polycarbonate, polystyrene, polyolefin, cellulose acetate and polyvinyl chloride. The white pigment is at least one selected from the group consisting of titanium oxide, silicon oxide, zinc oxide, Calcium, and aluminum oxide.

The diffusing polygonal mirror 143 may have a plurality of inclined surfaces 141 coupled to the upper surface of the reflection plate 142 in the form of polygonal pyramids. The diffusing polygonal mirror 143 is a main component for converting light emitted from the LED module 110 into a predetermined angle with respect to the longitudinal direction of the diffuser 130. The diffusing polygonal mirror 143 includes a plurality of inclined surfaces 141 The direction of the light emitted from the LED module 110 can be reflected (refracted) in various directions with respect to the center of the polygonal prisms.

Accordingly, the diffusion polygon mirror 143 can emit light emitted by the LED module 110 in various directions, thereby realizing a fluorescent lamp-type illumination device with improved front and side luminous intensity. At this time, the inclination of the plurality of inclined surfaces 141 constituting the diffusing polygonal prisms 143 can be adjusted to the inner diameter of the diffuser 130, and the number of the inclined surfaces 141 can be increased more So that a positive amount of light can be reflected and guided.

The diffusing polygonal mirror plate 43 having a transparent material has a predetermined internal space 145 so that the light emitted from the LED module 110 is refracted from one surface of the diffusing polygonal mirror 143, Since the light incident on the inner space 145 is refracted again on the other surface of the inner space 145 and can be diverted to the outside of the diffusing polygonal mirror 143, The plate 143 can provide an effect of diffusely reflecting light.

The heat radiating cover 150 may be disposed on the rear surface of the LED module 110 and may radiate or disperse heat generated from the LED module 110 to the outside. The heat radiating cover 150 will be described in more detail with reference to FIG. 7 is a view showing a detailed configuration of the heat dissipation cover 150 of FIG. 2. As shown in FIG.

7, the heat radiating cover 150 may include a main radiator 710, a sub heat sink 720, and a receiver 730.

The main heat generating element 710 includes a cylindrical heat dissipating body 711 having a plurality of holes 712 of a predetermined size and a plurality of heat dissipating bodies 711 formed on the outer circumferential surface of the heat dissipating body 711 And a heat dissipating fins 713 of the heat dissipating unit 710.

The sub heat dissipating body 720 has a cylindrical heat dissipating body 721 having a diameter smaller than the diameter of the heat dissipating body 711 and having a hole 722 of a predetermined size and received in the heat dissipating body 711, And a plurality of heat dissipation fins 723 formed on the inner circumferential surface of the heat dissipating body 721 at regular intervals.

The receptors 730 include an inner receptacle 731, an outer receptacle 732 disposed so as to surround the inner receptacle 731 with a predetermined gap in the outer radial direction of the inner receptacle 731, And a reinforcing rib 734 formed between the side wall of the inner receptacle 731 and the side wall of the outer receptacle 732. [ .

The through holes 733 are formed in the holes 712 formed in the heat dissipating body 721 of the sub heat dissipating body 720 and the holes 712 formed in the heat dissipating body 711 of the main heat dissipating body 710, And can communicate with each other. Also, the inner receptacle 731 and the outer receptacle 732 may be made of stainless steel, and the reinforcing rib 734 may be made of aluminum.

8 is an exploded perspective view illustrating an LED illumination device according to another embodiment of the present invention.

8, an LED illumination device 800 according to another embodiment of the present invention includes an LED module 110, a light diffusion lens 120, a diffuser 130, a diffusion plate 140, a heat dissipation cover 150, A connection terminal 160, a light-transmitting fiber 810, and a compression regulator 820. [

Here, the LED module 110, the optical diffusion lens 120, the diffuser 130, the diffusion plate 140, the heat dissipation cover 150, and the connection terminal 160 have the configuration shown in FIG. 1 Are similar or the same in their structure and action effect.

That is, another embodiment of the present invention is different only in that the light transmitting fiber 810 and the compression adjusting portion 820 are added to the components of the embodiment of the present invention.

Therefore, in another embodiment of the present invention, only the light transmitting fiber 810 and the compression adjusting unit 820, which are components newly added to an embodiment of the present invention, will be described in detail.

The light transmitting fiber 810 may be spirally formed in the diffuser 130 in the longitudinal direction of the diffuser 130. The light transmissive fiber 810 may include a wavelength conversion material for converting the wavelength of light emitted from the LED module 110 and passing through the light diffusion lens 120.

Accordingly, the light transmitting fiber 810 can convert light having passed through the helical open space into light having a different color through the wavelength converting material. Here, the wavelength converting material may be applied to the light transmitting fiber 810. That is, the light transmitting fiber 810 may be doped with a wavelength converting material such as a fluorescent dye, a phosphorescent dye, or a pigment.

Here, the wavelength converting material may be a phosphorescent material including nanomaterials such as quantum dots and phosphors. In addition, a fluorescent material may be used as the wavelength conversion material.

The light transmitting fiber 810 may include a cylindrical coil or a light transmitting fiber formed in the form of a spiral or a helix. The light transmissive fiber 810 may be embodied as a transparent or translucent light-transparent material, such as acrylic.

The compression adjusting unit 820 adjusts the degree of compression of the helical light transmitting fiber 810 to change the size of the spiral open space so that the color of the light emitted from the LED module 110 and the light transmittance The ratio of the color of the light converted by the fiber 810 can be adjusted.

Thus, according to another embodiment of the present invention, an LED lighting device of various colors can be realized, and various kinds of atmosphere can be produced under the illumination of the LED lighting device.

The compression regulating unit 820 can adjust the degree of compression of the light transmitting fiber 810 through various compression regulating means, for example, a physical means such as a bolt-nut coupling, or an electromechanical means such as a solenoid.

As described above, according to another embodiment of the present invention, various colors can be implemented. Therefore, a method of mapping the various colors to visible light in conjunction with an audio signal will be described in detail. According to another embodiment of the present invention, an audio signal may be input through the mapping method to implement various colors of illumination. To this end, other embodiments of the present invention may further comprise components relating to audio input, spectral analysis and mapping.

The frequency of the visible light may be non-linearly or linearly mapped to the frequency of the audio signal, and the frequency of the audio signal may be mapped to the frequency of the visible light based on Equation (2) below.

&Quot; (2) &quot;

Where f is the audio frequency, f _max is the maximum value of the audio frequency, F is the visible light frequency, F _max is the maximum value of the visible light frequency, F _min is the minimum value of the visible light frequency, 2 ^N -1, and N is an integer of 1 or more).

A technique of mapping an audio spectrum of 0 to 20 KHz to six visible light spectra will be described as an example.

Here, the six visible light spectra are assumed to be six colors of red, orange, yellow, green, blue, and violet to be used in LED illumination.

Linear mapping is also possible as a method for mapping an audio signal frequency to a visible light frequency, but nonlinear mapping is more effective. This is because, in the frequency component of an actual audio signal (e.g., music), a high-frequency component of 10 KHz or more appears less than a low-frequency component. Equation (2) may be used for nonlinear mapping. Equation (2) is one of the nonlinear mapping equations, and it is also possible to map through other mathematical equations.

In Equation (2), f is the input audio frequency of 0 to 20 KHz, and f _max is the maximum value of the input audio frequency of 20 KHz. F is the output visible light frequency, and F _min and F _max are the minimum and maximum values of the output frequency, 448 THz and 790 THz, respectively. Also, μ is a value representing the degree of nonlinearity and is a value of 2N-1. Here, N is an integer of 1 or more. Therefore, if N = 2 is used, then μ becomes 3. If μ is 3, the output visible light frequency for the input audio frequency is shown in Table 1 below.

Using this nonlinear mapping, the input audio frequency components can be mapped to six colors as shown in Table 2 below.

As described above, in the embodiments of the present invention, the hardness enhancing layer may be formed on the outer circumferential surface of the diffuser 120 to further strengthen the hardness thereof, It can be prevented from being damaged.

In the following, an experiment was conducted to measure the hardness, transmittance, heat resistance, adhesion, flexibility and the like of the hardness enhancing layer.

1. Preparation of specimens

In Example 1, 100 g of tetramethylolmethane tetraacrylate, 15 g of hydroxyethylhydroxypropylcellulose, 10 g of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, 10 g of ethyl 2- [3- (6-Nitrobenzo [d] thiazol-2-yl) ureido] acetate (7 g) was mixed with acetone, and a specimen having a thickness of 20 microns was prepared by injection molding and acetone was volatilized.

In Example 2, 100 g of tetramethylolmethane tetraacrylate, 35 g of hydroxyethylhydroxypropylcellulose, 20 g of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, 20 g of ethyl 2- [3- (6-Nitrobenzo [d] thiazol-2-yl) ureido] acetate was mixed with acetone to prepare a sample in the same manner as in Example 1.

In Comparative Example 1, 100 g of tetramethylolmethane tetraacrylate, 40 g of hydroxyethylhydroxypropylcellulose, 5 g of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, 5 g of ethyl 2- [3- (6-Nitrobenzo [d] thiazol-2-yl) ureido] acetate was mixed with acetone to prepare a sample in the same manner as in Example 1.

In Comparative Example 2, 100 g of tetramethylolmethane tetraacrylate, 10 g of hydroxyethylhydroxypropylcellulose, 30 g of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, 30 g of ethyl 2- [3- (6-Nitrobenzo [d] thiazol-2-yl) ureido] acetate was mixed with acetone to prepare a sample in the same manner as in Example 1.

In Comparative Example 3, 100 g of tetramethylolmethane tetraacrylate, 25 g of hydroxyethylhydroxypropylcellulose, 15 g of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, 15 g of ethyl 2- [3- (6-Nitrobenzo [d] thiazol-2-yl) ureido] acetate was mixed with acetone to prepare a sample in the same manner as in Example 1.

In Comparative Example 4, 100 g of tetramethylolmethane tetraacrylate, 20 g of hydroxyethylhydroxypropylcellulose, 10 g of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, 10 g of ethyl 2- [3- (6-Nitrobenzo [d] thiazol-2-yl) ureido] acetate was mixed with acetone to prepare a sample in the same manner as in Example 1.

The compositions shown in Examples 1 to 2 and Comparative Examples 1 to 4 are summarized in Table 3, and the unit is gram (g).

division Example Comparative Example One 2 One 2 3 4 Tetramethylol methane tetraacrylate 100 100 100 100 100 100 Hydroxyethylhydroxypropylcellulose 15 35 40 10 25 20 Octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate 10 20 5 30 15 15 Ethyl 2- [3- (6-nitrobenzo [d] thiazol-2-yl) ureido] acetate 7 15 One 10 2 20

2. Hardness measurement and evaluation method

The following items were evaluated for the specimens prepared in Examples 1 to 2 and Comparative Examples 1 to 4.

1) Pencil hardness was measured by ASTM D3502 (pencil hardness tester).

2) The transmittance was measured by UV-vis spectrum (DARSA PRO-5000 SYSTEM).

3) Heat resistance was measured at 90 ℃ for 4 hours after cracking and bending.

4) Adhesiveness was evaluated by evaluating whether or not peeling phenomenon occurred by making a line at 2mm intervals on the specimen, and then visually inspecting the specimen after strong adhesion of TAPE.

5) Flexibility was evaluated by cracking by 180 ° bending after 12 hours of coating.

3. Results and Analysis

The evaluation results are shown in Table 4.

division Example Comparative Example One 2 One 2 3 4 Pencil hardness 9H 9H 7H 5H 6H 5H Transmittance (%) 91.6 91.4 91.6 91.7 91.5 91.6 Heat resistance Good Good Crack and warp Crack and warp Crack and warp Crack and warp Adhesiveness 100/100 100/100 100/100 100/100 100/100 100/100 flexibility Good Good crack crack crack crack

As can be seen from the results of Table 4, it can be seen that Examples 1 and 2 have excellent properties in terms of both pencil hardness, transmittance, heat resistance, adhesion, and flexibility, whereas in Comparative Examples 1 to 4, excellent transmittance But has poor properties in terms of pencil hardness, heat resistance and flexibility.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

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, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

110: LED module
120: light diffusion lens
130: Diffuser
140: diffusion plate
150: heat radiating cover
160: connection terminal
810: light transmitting fiber
820:

Claims (9)

At least one LED module receiving power from outside through a connection terminal and irradiating light;
And an aspherical surface having an asymmetric structure on the Y axis, wherein the divergent light of the LED module is condensed through a curved surface concaved with respect to a normal direction in which the divergent light of the LED module is incident And a light outgoing outer surface that diffuses the light condensed by the light incidence inner surface and uniformly distributes the divergent light of the LED module to the entire area of the target area;
A cylindrical diffuser in which the at least one LED module and the light diffusing lens are disposed at both ends and diffuses light emitted from the light diffusing lens; And
And a wavelength conversion material formed inside the diffuser in a longitudinal direction of the diffuser and adapted to convert the wavelength of the outgoing light from the optical diffusion lens so that light passing through the helical open space is transmitted through the wavelength conversion material Transmitting fiber to be converted into light of different colors through the light-
And a light emitting diode (LED).
The method according to claim 1,
The light incidence inner surface of the light diffusion lens
An aspherical surface curvature value, a conic constant, and an aspherical surface coefficient, the shape of the aspherical surface being determined to be either an ellipse or a hyperbola.
delete The method according to claim 1,
The reflector, which is formed flat in the longitudinal direction of the diffuser,
A white opaque reflective film made of a white opaque synthetic resin, wherein the white opaque synthetic resin is a synthetic resin having a white color by the blending of white pigments or the dispersion of minute bubbles, and the synthetic resin for producing the reflector is polyethylene terephthalate, polyethylene naphthalate, Wherein the white pigment is at least one selected from the group consisting of titanium oxide, silicon oxide, zinc oxide, lead carbonate, barium sulfate, calcium carbonate and aluminum oxide. Wherein the light emitting device is one selected from the group consisting of LEDs.
delete The method according to claim 1,
Transparent fiber to adjust the compression ratio of the helical light-transmitting fiber to change the size of the spiral open space, thereby adjusting the ratio of the color of the emitted light from the light diffusing lens to the color of the light converted by the light- part
Further comprising: a light emitting diode (LED).
The method according to claim 1,
A heat radiating cover disposed on a rear surface of the LED module for emitting or dispersing heat generated from the LED module to the outside,
Further comprising:
The heat-
A cylindrical heat radiating body having a plurality of holes of a predetermined size; And
A plurality of heat dissipating fins formed on the outer circumferential surface of the heat dissipating body in units of constant intervals for increasing the heat dissipating area
And a light emitting diode (LED).
8. The method of claim 7,
The heat-
And a plurality of heat dissipating fins which are cylindrically formed in a cylindrical shape having a diameter smaller than the diameter of the heat dissipating body and are accommodated in the heat dissipating body,
Further comprising: a light emitting diode (LED).
At least one LED module receiving power from outside through a connection terminal and irradiating light;
And an aspherical surface having an asymmetric structure on the Y axis, wherein the divergent light of the LED module is condensed through a curved surface concaved with respect to a normal direction in which the divergent light of the LED module is incident And a light outgoing outer surface that diffuses the light condensed by the light incidence inner surface and uniformly distributes the divergent light of the LED module to the entire area of the target area;
A cylindrical diffuser in which the at least one LED module and the light diffusing lens are disposed at both ends and diffuses light emitted from the light diffusing lens; And
A hardness enhancing layer formed on an outer circumferential surface of the diffuser to strengthen the hardness of the diffuser;
/ RTI &gt;
The hardness-
15 to 35 parts by weight of hydroxyethylhydroxypropylcellulose and 10 to 20 parts by weight of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate, based on 100 parts by weight of tetramethylolmethane tetraacrylate And 7-15 parts by weight of ethyl 2- [3- (6-nitrobenzo [d] thiazol-2-yl) ureido] acetate.

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