KR101149580B1 - Diffusion type reflector for light adjusting of led - Google Patents

Abstract

PURPOSE: A diffusion type reflector for controlling light of an LED light source is provided to reduce a glaring phenomenon while maintaining overall light uniformity with respect to a target region. CONSTITUTION: A reflection member(R) forms a reflective surface(110) on left and right sides in which the lower part of the reflective surface is opened due to a concave groove structure. The reflective surface is extended to a lower side from the uppermost point of an upper part. The reflective surface has an aspherical surface with gradually increasing curvature. The reflective surface uniformly controls diffusion of LED light. The LED light is projected toward the reflective surface by an LED side surface arrangement part(120).

Description

Diffusion type reflector for light adjusting of LED

The present invention relates to a diffuse type reflector for light control of an LED (light emitting diode) light source, and more particularly, to adjust light through a structural design having an aspherical surface for light control to be sent farthest from the strongest center light of the LED light source. It is directed to a diffuse reflector for light control of an LED (LED) light source to control the bi-axial direction of the light source as well as to induce even brightness over a large area.

Recently, a light emitting diode (LED) including a semiconductor element is attracting attention as a light source of various lighting devices. This LED device has low power consumption and long life compared to conventional lighting lamps such as incandescent lamps and fluorescent lamps. It is widely used throughout the industry as a lighting lamp such as a display light source, a general lighting device or an automobile headlight. .

However, the LED light source has a strong characteristic of the straightness of the light, and as shown in FIG. 1, the light energy emission form of the LED near the point light source generally forms a Gaussian distribution in which the light distribution is concentrated in the central portion of the light source. do. This results in glare and light pollution due to sparking because the center light is too strong compared to the surroundings.

In order to compensate for the glare caused by the central light concentration and the disadvantages of light pollution, an optical lens (diffusion lens) is developed to diffusely adjust the light distribution of the LED by being used in combination with the LED side.

However, most of the LED light diffusing optical lenses (diffusion lenses) that have been developed and applied to date, however, do not adjust the light of a point light source in the form of a surface light source through light diffusion. As shown in FIG. 2, the radiation form has a Lambertian distribution, which indicates that the center light is still stronger than the surroundings, and does not induce uniform brightness, and is still insufficient to adjust the light diffusion of the LED light source. Is in.

In other words, the glitter due to the central light concentration is still not able to remove the glare phenomenon, and the light control efficiency is greatly reduced, which proves that there is a considerable difficulty in controlling the divergent light of the LED such as light diffusion.

In particular, LED is widely used in various industrial fields such as indoor lighting, outdoor lighting, and backlighting by various advantages. Despite the need for light distribution adjustment and stable optical characteristics according to each application, the conventional development and The proposed optical lens for LED light diffusion only induces light diffusion for LED divergent light, so it is not able to bring out the lighting efficiency for each application to the maximum, and improves even brightness and glare for LED divergent light. Rather, there is a problem that can further cause light pollution, such as there may be a light depletion region that the light does not reach in the radiation form.

In addition, the conventional light diffusing optical lens of the LED is adjusted by light so as to induce light diffusion only in one axis direction of the X-axis direction or the Y-axis direction regardless of the characteristics of each application to be applied, It is not able to bring out the lighting efficiency and energy efficiency to the maximum.

For example, in the case of tunnel lighting, it is installed while maintaining a certain height and distance in a tunnel having a kind of closed space, and the driver may feel frustrated because the illumination uniformity is not maintained because the uniform brightness in the tunnel is not maintained. In addition, the driver can experience a black hole effect or a white hole effect momentarily by the flash of light emitted from the tunnel, which can have a profound effect on safe driving.Safe driving in closed spaces including underground parking lot There was a problem that can not properly secure the field of view for.

In addition, in the case of signboard lighting, it is difficult to maintain even brightness, and only the sparkling is strong, which causes glare, which increases eye fatigue. There was a problem that could not be raised.

On the other hand, the diffusion type optical lenses for inducing light diffusion of the conventional LED, there is a problem that can not be recycled at all after fabrication and use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and the like, and the overall light uniformity of the target area is controlled by controlling the diffused light of the LED to be diffusely adjusted in both the X axis direction and both axis directions instead of the Y axis direction. It is an object of the present invention to provide a diffuse reflector for light adjustment of an LED (LED) light source that can be used as an indirect illumination through reflection and refraction while improving light uniformity, thereby improving glare and light pollution.

The present invention is to control the biaxial direction of the light adjustment as well as to control a large area of the light control through the aspherical structure design to collect the light while diffusing the light from the strongest center light of the LED light source and at the same time to collect the lost light of the LED light source It is to provide a diffuse reflector for light control of an LED (LED) light source to induce even brightness over.

The present invention provides a diffused reflector for light adjustment of an LED (LED) light source to achieve the maximum lighting efficiency and energy efficiency without using a diffusing optical lens, and to provide a recyclable economy. To provide.

Diffusion type reflector for light adjustment of an LED (LED) light source according to the present invention for achieving the above object has a reflecting member formed in the left and right direction the reflecting surface is opened by the recess structure;

The reflective surface is formed as an aspherical surface having a curvature of the shape gradually widening while extending downward from the top of the top of the groove surface of the lower opening to provide a uniform diffuse diffusion control of the LED;

Wherein the reflecting member is located on both sides of the left and right side formed with the reflective surface LED is disposed on the side and the LED side arrangement portion of the lower opening is formed by the recess structure so that the divergent light of the LED can be incident toward the reflective surface It features.

Preferably, the reflecting surface formed on the reflecting member is an aspherical surface directly facing the LED disposed on the side of the reflecting member, the first reflecting surface is formed to be narrow in the upper portion of the groove structure and wider in the lower portion; Aspheric areas extending from both sides of the first reflecting surface and located in both sides of the LED disposed on the side of the reflecting member and leading to the LED side arrangement, the upper portion is narrower and the lower portion is wider at both sides, but toward the outer side. A second reflective surface that gradually expands curvedly; It may be made, including.

Preferably, the first reflective surface and the second reflective surface may be formed as an aspherical surface having a partitioned boundary, or the first reflective surface and the second reflective surface may be formed as one aspherical surface having a continuous curvature.

Preferably, the reflective member is formed of a plastic material made of resin, the body formed with a reflective surface and the LED side arrangement; A metal reflecting material coated on the surface of the body for light diffusion; It may be made, including.

Preferably, a plurality of reflectors may be arranged in a horizontal line or a plurality of reflectors may be used integrally.

According to the present invention, the light emitted from the LED is diffused in both the x-axis direction and the two-axis direction, not any one axis in the Y-axis direction, in particular to adjust the light to send farthest from the strongest center light of the LED light source At the same time, through the aspherical structure design that collects the lost light of the LED light source and diffuses the light, it can induce even brightness over a large area to maintain the overall light uniformity of the target area and indirect lighting role. As a result, a useful effect of improving glare and light pollution caused by the use of LEDs can be achieved.

The present invention is responsible for the dual angle of view processing at two light distribution angles for the LED light source, can be adjusted to diffuse light, and can realize the maximum lighting efficiency and energy efficiency for the LED light source without using a diffused optical lens, recycling Compared to this impossible optical lens can be recycled to provide economics.

In the present invention, since the reflector is formed into an open structure, the heat generation of the LED, which is a light source, can be easily performed, and it is not necessary to have a separate diffused lens, and a heat dissipation effect can be expected. It can have a degree of freedom in the selection of the LED light source.

The present invention can be more useful to improve the outdoor lighting function of tunnel lights, underground parking lot lighting, stand lighting, signage, etc., and to improve the uniform brightness and glare over a large area. It can also be used as a useful effect can be achieved to greatly widen the scope of application.

1 is a view showing a general light energy emission form for the LED light source.
Figure 2 is a view showing the radiation form of the LED light source is adjusted by the conventional light diffusing lens.
3 and 4 is a view showing a diffuse reflector for light adjustment of the LED light source according to an embodiment of the present invention.
5 is a view showing a diffuse type reflector for light adjustment of an LED light source according to the present invention in a state where an LED light source is disposed on a side surface thereof.
Figure 6 is a three-dimensional sketch showing a diffuse type reflector for light adjustment of the LED light source according to another embodiment of the present invention.
7 is a view showing another embodiment of the light reflecting diffusion reflector of the LED light source in the present invention.
Figure 8a is a ray tracing diagram showing the radiation form through the first reflecting surface in the diffuse type reflector for light adjustment of the LED light source according to the present invention.
Figure 8b is a ray tracing diagram showing the radiation form through the second reflecting surface in the diffuse type reflector for light adjustment of the LED light source according to the present invention.
9 is a simulation data showing the light distribution density and radiation pattern according to one installation when the LED is used as an underground parking lot lighting device by applying a diffuse reflector for light adjustment of the LED light source according to the present invention.
10 is a simulation data showing the light distribution density and the radiation pattern according to a plurality of installation when using the LED as an underground parking lot lighting device by applying the light reflecting diffusion type reflector of the LED light source according to the present invention.
11 and 12 are three-dimensional diagrams for explaining the reflecting surface conditions of the reflector according to another embodiment of FIG. 6 according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

In the following description, the terms "upper" and "lower" are to be understood as meaning directions based on the reflection surface 110 of the reflector 100 being installed downward toward the target area.

Diffuse reflector for light adjustment of the LED (LED) light source according to an embodiment of the present invention has a substantially block-like body, as shown in Figures 3 to 5, but the lower portion is opened by the groove structure in the left and right direction of the body And a reflective member R having the lower opening groove surface as the reflective surface 110.

The reflecting member R is disposed on both sides of the left and right sides of the reflecting surface 110, respectively, where the light source LEDs 1 are disposed on the side, and the light emitted by the LED 1 toward the reflecting surface 110 is provided. LED sidewalls 120 are formed in the lower opening by the side recess structure.

As such, since the reflective member R is formed to have an open structure, the heat generation of the LED 1, which is a light source, is easily performed, and it is not necessary to provide a separate diffusion lens, and a heat dissipation effect can be expected.

The reflective surface 110 of the reflective member R is formed in an aspherical surface having a curvature of a shape that gradually widens while extending downward from the uppermost point in the recessed surface of the lower opening. Aspheric region directly facing the LED (1) disposed on the side, the first reflecting surface 111 is formed to narrow the upper portion of the groove structure, the lower portion widen to both sides, and extend from both sides of the first reflecting surface and reflected Aspheric region located on both sides of the LED (1) disposed on the side of the member (R) and leads to the LED side arrangement portion 120, the upper portion is narrower and the lower portion is wider to both sides, but gradually curved toward the outside direction It is composed of a second reflecting surface 112 which is forcibly extended.

As described above, the reflecting member R having the aspherical reflecting surface 110 by the first reflecting surface 111 and the second reflecting surface 112 described above is aspheric reflecting surface 110 when viewed from a lower plane. The outer periphery of the lower part of the will be configured to have a circular shape.

Furthermore, although the first reflecting surface 112 and the second reflecting surface forming the aspherical reflecting surface 110 are shown only in the form of aspherical surfaces having some partitioned boundaries, as shown in another embodiment of FIG. 6, the The first reflecting surface and the second reflecting surface may be formed as a single aspherical surface having a continuous curvature (free curved surface) by connecting one without a partitioned boundary.

In this case, as shown in FIGS. 11 and 12 when the aspherical reflective surface forming the first reflective surface and the second reflective surface in the form of a free curved surface connected to one another as in the other embodiment of FIG. A polynomial that satisfies the form of a right function (symmetrical about the X axis) must be a Polylynomial surface, and in the y-axis direction it must be an odd function. The polynomial surface that satisfies can greatly widen the light diffusion efficiency due to reflection and increase the light uniformity.

In numerical analysis, this means that the coefficient of the odd order term of the x-variable must satisfy 0, and at least one odd order on the y-axis must not be zero, as shown in Equation 1 below. (W) may be represented.

(1)

W =

Here, z becomes an independent variable, so three independent variables add up to the dependent variable, which in principle becomes a four-dimensional function, but it is defined as a function f (x, y, z) = W, where W = 1 set) and develop into a single equation, which finally becomes a three-dimensional nonlinear free-form equation.

In other words, the reflector having a free-curved aspherical reflective surface as in the embodiment of FIG. 6 constitutes the polynomial surface shown in the three-dimensional view of FIG. 11 in the form of a symmetrical structure, and the polynomial surface shown in FIG. It satisfies the x, y coefficient condition, which is the three-dimensional shape constraint condition in Equation 1, can be expressed by Equation 2 below.

(Equation 2)

W =

In this case, the equation condition is satisfied that the primary and tertiary orders (odd order terms) of the x variable satisfy zero, and the primary and tertiary orders of the y variable are not zero.

Therefore, the odd-order terms of the y-variables show that at least one of the non-zero terms satisfies the free-form surface condition of the polynomial surface.

In addition, the reflective member (R) has a body formed with a reflective surface 110 and the LED side arrangement portion 120 made of a plastic material made of resin to enable easy molding, light weight, and recycling, and on the surface of the body It is composed of a coating treatment of a metal reflective material so that the light is diffused and adjusted by reflecting and refracting the divergent light of the LED which is a light source.

In this case, the plastic material may be used without particular limitation among thermosetting resins and thermoplastic resins, and the metal reflecting material may include aluminum (Al), nickel (Ni), or chromium (Cr).

In addition, the diffuse type reflector 100 for adjusting the light source of the LED light source according to the present invention may be used by arranging a plurality of reflectors in a horizontal line or as a plurality of integrally, as shown in FIG. 7. It can be used in various ways to construct a diffused LED lighting device through.

On the other hand, Table 1 below shows the aspherical data for the light reflecting diffusion type reflector 100 of the LED light source according to an embodiment of the present invention.

Table 1. Aspherical data of a diffuse reflector for light adjustment of an LED light source according to an embodiment of the present invention

Here, Table 1 shows that the reflective surface 110 of the present invention composed of aspherical surface has not only an aspherical curvature value but also an aspherical conic constant and an aspherical surface coefficient. As a result, the light uniformity of the LED can be improved.

8A and 8B are ray tracing diagrams showing a light diffusion form of the diffuse reflector for light adjustment of the LED light source according to the present invention.

Here, FIG. 8A is a principal ray tracing diagram showing a radial shape through the first reflective surface 111. The upper portion is narrow and the lower portion is an aspherical region directly facing the LED 1 disposed on the side of the reflective member R. The first reflecting surface 111, which is formed to be wider at both sides, shows that the target is irradiated downwardly to the left and right as a target area through multiple reflections that receive and reflect the straight light of the LED 1 light source.

At this time, the first reflecting surface 111 sends the farthest light from the strongest center light of the LED (1) light source, and serves to increase the light uniformity in the Y-axis direction by applying an aspherical surface.

8B is a radial ray tracing diagram showing a radial shape through the second reflecting surface 112, the upper portion being narrow in the aspherical region which is located on both sides of the LED 1 and leads to the LED side arrangement 120. The lower part is widened to both sides, but the LED 1 light is lost in both directions in the multiple reflection of the first reflecting surface 111 in the second reflecting surface 112 of the aspherical surface gradually expanding toward the outer direction. In this case, the reflected light is irradiated directly below the center of the target region through reflection and refraction.

At this time, the second reflecting surface 112 serves to diffuse the light while collecting the lost light of the LED 1 to the center side through the aspherical grafting, and serves to control the light in the X-axis direction.

That is, the present invention shows that both axes control is simultaneously performed in the X-axis direction and the Y-axis direction through the structural design of the aspherical first reflecting surface 111 and the second reflecting surface 112.

On the other hand, Figure 9 is a simulation data showing the light distribution density and the radiation pattern when using the LED light source as an underground parking lot lighting device by applying the light reflecting diffuser 100 for adjusting the LED light source according to the present invention, height 2.5 When installed in m, the receiver area was 5m ㅧ 10m, and when looking at the optical distribution density graph, it showed that the optical uniformity of 12㎡ was formed by irradiating 2.6m on the X axis and 4.6m on the Y axis. Giving.

In addition, the radiation pattern data shows that the light is adjusted to form a light distribution angle of 40 to 45 degrees with respect to the X axis direction, and the light is adjusted to form a light distribution angle of 90 to 100 degrees with respect to the Y axis direction. Demonstrates simultaneous control of both axes.

On the other hand, Figure 10 is a simulation data showing the light distribution density when the LED is used as an underground parking lot lighting device by applying the light reflecting diffuser 100 for adjusting the light source of the LED light source according to the present invention, a plurality of simulation data installed to be.

The data of FIG. 10 is a simulation result of a state in which 9 modules are installed in an underground parking lot LED lighting device using six reflectors 100 according to the present invention as one module. The receiver area is 12m ㅧ 25m, and when looking at the light distribution density graph, it shows that the light uniformity of 98m² is formed by irradiating 7m on the X axis and 14m on the Y axis.

As described above, the diffusion type reflector 100 of the LED (LED) light source according to the present invention is assembled by arranging the LED 1, which is a light source, disposed on the side of the LED side arrangement part 120 as shown in FIG. 5. Diffuse LED lighting device can be configured, the diffuse reflector 100 according to the present invention is applied as a component of the diffused LED lighting device lighting efficiency and energy such as tunnel light, underground parking lot lighting, stand lighting, signage, etc. The efficiency can be increased, so it can be used more usefully, and it can be used for indoor lighting, which sometimes replaces fluorescent lamps, and can be used for wider application.

The embodiments described above are merely illustrative of the preferred embodiments of the present invention and are not limited to these embodiments, and various modifications, changes or substitutions may be made by those skilled in the art within the spirit and scope of the present invention. This may be done, which will belong to the technical scope of the present invention.

1: LED 100: LED diffuse reflector
110: reflective surface 111: first reflective surface
112: second reflecting surface 120: LED side arrangement
R: reflective member

Claims (5)

In the diffuse reflector for diffusely adjusting the divergent light of the LED light source,
It has a reflecting member formed in the left and right direction the reflecting surface is opened by the recess structure;
The reflective surface is formed as an aspherical surface having a curvature of the shape gradually widening while extending downward from the top of the top of the groove surface of the lower opening to provide a uniform diffuse diffusion control of the LED;
Wherein the reflecting member is located on both sides of the left and right side formed with the reflective surface LED is disposed on the side and the LED side arrangement portion of the lower opening is formed by the recess structure so that the divergent light of the LED can be incident toward the reflective surface Diffuse reflector for light adjustment of an LED light source. The method of claim 1,
The reflective surface formed on the reflective member,
A first reflecting surface formed as an aspherical surface directly facing the LED disposed on the side of the reflecting member, the upper portion of the recess structure being narrow and the lower portion widening to both sides;
Aspheric areas extending from both sides of the first reflecting surface and located in both sides of the LED disposed on the side of the reflecting member and leading to the LED side arrangement, the upper portion is narrower and the lower portion is wider at both sides, but toward the outer side. A second reflective surface that gradually expands curvedly; Diffuse reflector for light adjustment of the LED light source comprising a. The method of claim 2,
The first reflective surface and the second reflective surface is formed as an aspherical surface having a partitioned boundary, or the first reflective surface and the second reflective surface is formed as one aspherical surface having a continuous curvature of the LED light source, characterized in that Diffuse reflector for light adjustment. The method of claim 1,
The reflective member,
A body formed of a plastic material made of resin, and having a reflective surface and an LED side arrangement;
A metal reflecting material coated on the surface of the body for light diffusion; Diffuse reflector for light adjustment of the LED light source comprising a. The method according to any one of claims 1 to 4,
A diffuse type reflector for light adjustment of an LED light source, which can be used by arranging a plurality of reflectors in a horizontal line or integrally configuring a plurality of reflectors.

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