KR20190092865A - Optical system having backlight distribution control function for surface light source led and the led lighting device - Google Patents

Abstract

The present invention relates to an optical system having a backlight distribution control function for a surface light source light emitting diode (LED) and a street or security LED lighting device including the same. According to the present invention, the optical system is a lens structure which is formed by integrating front and rear bodies structured in a different shape and comprises: a light distribution control unit formed by continuously forming a convex free-curved surface with a ridge on the front and rear bodies with respect to the outer surface, formed in a free-curved surface to have a recessed shape formed at the central portion of the optical system toward the outer surface with respect to the inner surface, and having a surface light source LED disposed therein; and a backlight distribution control unit formed in a free-curved surface to have a recessed shape toward the outer surface with respect to the rear side of the optical system to control backlight distribution for light emitted to the rear side from the surface light source LED. Accordingly, the optical system complexly includes a full-reflective structure for the light while having a continuous surface structure, thereby optimally controlling the backlight distribution, such as minimization of the backlight loss of light emitted from the surface light source LED and the like, and increasing the backlight distribution control efficiency for the surface light source LED through only the optical system without a device.

Description

OPTICAL SYSTEM HAVING BACKLIGHT DISTRIBUTION CONTROL FUNCTION FOR SURFACE LIGHT SOURCE LED AND THE LED LIGHTING DEVICE}

The present invention relates to a light distribution control optical system suitable for a surface light source LED including a COB (Chip On Board) type LED and an LED lighting device including the same, and more specifically, to have a continuous surface structure, but the total reflection structure for the light complex For the surface light source LED which can control the back light optimally for the light emitted from the surface light source LED, minimize the back light loss, and improve the post light control efficiency with only the optical system without equipment. The present invention relates to an optical system and a LED lighting device for a street lamp or a security lamp including the same.

Recently, LED (Light Emitting Diode) has been adopted as a light source for energy saving throughout the industry including lighting devices, and accordingly, research and development in each industry to use LED more effectively and efficiently. This is actively going on.

Due to the development of LED technology, the LED light source is changing its market from a conventional point source to a surface light source. It is switching from the (DC) system to the AC system.

Accordingly, COB (Chip On Board) type LEDs are widely adopted as a light source for various lighting devices including street lights, security lamps, etc., and the LEDs are attached to a substrate. It is possible to have the lighting of the present invention, but also to provide the usefulness of enabling the low-cost implementation of the lighting device as well as enabling the compact production.

Meanwhile, the applicant of the present application proposes an optical lens for applying a COB-type LED through the domestic registered patent No. 10-1667360, and controls the light distribution for the light emitted from the COB-type LED and a LED lighting device for a street lamp including the same. However, since there is a lack in the rear light distribution control, a loss occurs, and thus, there is a disadvantage in that a fixture is additionally mounted on the rear side of the lighting device to compensate for this, and a lot of light is distributed to the rear side, causing light pollution in residential areas. In order to solve these problems, the market requires a lighting device with a higher level of satisfaction.

Republic of Korea Patent Publication No. 10-1667360

The present invention has been made in view of solving the above-described conventional problems, and having a continuous surface structure, but having a total reflection structure for light in combination with respect to the light emitted from the surface light source LED including a COB type LED, etc. The optical system for the surface light source LED and the street lamp including the same that can control the rear light distribution optimally by minimizing the rear light distribution loss and to improve the rear light distribution control efficiency of the surface light source LED with only the optical system without any fixture. The purpose of the present invention is to provide a lighting or security LED lighting device.

The present invention controls the overall light distribution of the light emitted from the surface light source LED, but by controlling the rear light emission emitted to the rear side to send to the front (front) to reduce the rear light ratio to minimize the loss and the front light ratio It is an object of the present invention to provide an optical system for a surface light source LED and a LED lighting device for a street lamp or a security lamp including the same, which can increase post-distribution control.

The present invention enables to meet and improve the technical satisfaction required by the market, to implement high power and to provide a stable brightness as well as to solve the light pollution problem on the road or residential area depending on the use, street lamp Another object of the present invention is to provide an optical system for a surface light source LED capable of performing post-distribution control and performing a light distribution useful for a security light and increasing lighting efficiency, and an LED lighting device for a street lamp or a security lamp including the same.

The optical system for a surface light source LED capable of controlling the rear light distribution according to the present invention for achieving the above object, in the optical system for controlling the overall light distribution of the surface light source LED while controlling the rear light emission emitted to the rear side, the front ( It is a lens sphere in which the front body and the rear body are structured in different shapes and integrally formed; The lens structure has a convex free curved surface having a ridgeline on the front body and the rear body with respect to the outer surface continuously formed, and is formed as a free curved surface so as to have a recessed shape toward the outer surface at the central portion of the optical system with respect to the inner surface. A light distribution control unit in which the surface light source LED is disposed, and a rear light distribution control unit configured to have a shape curved toward the outer surface of the rear of the optical system and a rear light distribution control unit configured to control the rear light emission of the emitted light of the surface light source LED which is advanced backwards; It is characterized by.

Here, an initial formation angle of light emitted from the center of the surface light source LED to reach the rear of the light distribution control unit is referred to as "α", and the light reaching the rear light distribution control unit from the rear of the light distribution control unit and the free curved surface of the rear light distribution control unit. The forming angle formed therebetween is referred to as "β", and the forming angle formed between the light that is totally reflected from the free curved surface of the rear light distribution control unit and reaches the free surface behind the outer surface and is refracted forward and the free curved surface behind the outer surface When " [gamma] ", the inner light distribution control unit for controlling the rear light distribution satisfies β> 42 ° and γ <90 ° when α = 9 °, and 44 ° <β <when α = 18 °. When it satisfies 46 °, 65 <γ <70 °, and α = 27 °, it can be formed to have a free curved surface that satisfies 42 ° <β <44 ° and 60 <γ <65 °.

Here, the lens structure, the length in the X-axis direction from the front body to the rear body is "A", the central side length in the X-axis direction relative to the rear body is called "B", the front body and the rear body The length in the Y-axis direction at the boundary point between the ends is referred to as "C", and when the diameter of the surface light source is normalized to 1 (mm), 3 <A <3.6, 1 <B <1.2, 5.5 <C <6.6 It can be formed in a size that satisfies.

Here, the lens structure, the front body is formed longer than the rear body in the length with respect to the Y-axis direction, the front body in the outer ridges in the rear body It can be formed higher than that.

In addition, the LED lighting device for a street lamp or security lamp according to the present invention for achieving the above object, including the optical system for the surface light source LED capable of the rear light distribution having the above configuration; including, but disposed below the optical system It is characterized in that it is configured to illuminate the road or residential area by controlling the overall light distribution including the rear light distribution control for the light emitted from the surface light source LED.

According to the present invention, it is possible to optimally control the rear light distribution by minimizing the rear light distribution loss for the light emitted from the surface light source LED including the COB-type LED by having a continuous surface structure but having a total reflection structure for the light. It is possible to achieve the usefulness of improving the backlight control efficiency for the surface light source LED by using only the optical system without the instrument.

The present invention is to control the overall light distribution of the light emitted from the surface light source LED, but to efficiently control the rear light emission emitted to the rear side to send to the front (front) to reduce the rear light ratio to minimize the loss and the front (front) It is possible to increase the light ratio and achieve usefulness to minimize the amount of light lost to the rear.

The present invention can meet and improve the technical satisfaction required by the market, and can provide a stable brightness and high power through the application of the surface light source LED, light pollution in the road or residential area depending on the intended use The problem can be solved, and it can provide useful effects to perform light distribution useful for street lights or security and increase lighting efficiency.

1 is a perspective view showing an optical system for a surface light source LED capable of post-distribution control according to an embodiment of the present invention.
2 is a cross-sectional view showing an optical system for a surface light source LED capable of post-distribution control according to an embodiment of the present invention.
FIG. 3 is an exemplary view illustrating a structure of a rear light distribution control unit in an optical system for a surface light source LED capable of rear light distribution control according to an embodiment of the present invention.
4 is a view showing simulation data according to the structure of the rear light distribution control unit in the present invention.
FIG. 5 is an exemplary view illustrating an external structure of a lens structure in the optical system for a surface light source LED capable of controlling rear light according to an embodiment of the present invention.
6 to 8 is a view showing the simulation data for the optical system for the surface light source LED capable of post-distribution control according to an embodiment of the present invention.
9 is an exemplary view showing an LED lighting device for a street lamp or security lamp including an optical system for a surface light source LED capable of post-distribution control according to an embodiment of the present invention.
10 is simulation data of an LED lighting device for a street lamp or security lamp including an optical system for a surface light source LED capable of post-distribution control according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and the detailed description will provide a better understanding of the purpose, configuration, and features thereof.

As shown in FIGS. 1 to 8, the optical system 100 for a surface light source LED capable of post-distribution control according to an embodiment of the present invention controls the overall light distribution of the surface light source LED 1 including a COB type LED while being rearward. By controlling the rear light emission emitted to the front side to reduce the rear light ratio, to minimize the loss and to increase the front light ratio, the front body 110 and The rear body 120 is composed of a lens sphere (L) which is structured in a different shape and integrally formed.

The lens structure (L) may be made of glass or a polymer such as polycarbonate (PC), polymethyl methacrylate (PMMA), cyclo olefin copolymer (COC), or the like. It may be formed of a material, it is composed of a block-shaped body having an outer shape, but with an inner and outer surface.

The lens structure L is formed of a convex free curved surface having ridges on the front body 110 and the rear body 120 with respect to the outer surface L1, respectively, and is formed in a continuous shape.

The lens structure (L) is formed in a free curved surface to have a concave shape toward the outer surface in the central portion of the optical system 100 with respect to the inner surface (L2) and the light distribution control unit 111 and the surface light source LED 1 is disposed; To include a rear light distribution control unit 121 is formed in a free curved surface in the rear of the optical system 100 to have a concave shape toward the outer surface to control the rear light distribution of the emitted light of the surface light source LED (1) proceeding to the rear. It is composed.

The lens structure L is more preferably formed aspheric with respect to each of the outer surface L1 and the inner surface L2. Aspheric conic constants and aspheric coefficients can be adjusted through the configuration of these aspherical surfaces, making it possible to make the best use of degrees of freedom according to the curved surface, and to arbitrarily adjust the radiation path and light distribution more freely with respect to the divergent light of the surface light source LED (1). It is possible to perform post-light distribution control more easily.

At this time, the lens structure (L) is a length in the Y-axis direction in the front (110) the front body 110 is formed longer than the rear (120) body 120, the ridge to form the outer surface (L1). In this case, the front body 110 is formed higher than the rear body 120.

Here, the lens structure (L) controls the emission light of the surface light source LED (1) through the back light control in the rear body 120 having a back light control unit 121 on the inner surface (L2). In addition, by controlling the overall light distribution through the light distribution control unit 111 to be controlled to be distributed to the front light quantity ratio: rear light quantity ratio = 80: 20 and the like for the surface light source LED (1).

For example, when installed and used for street light, the front light ratio means road side (SS), and the rear light ratio means home side (HS), which brightens the road side and darkens the side. It means illumination.

To this end, in the present invention to shape the lens structure (L) it should be able to satisfy the following conditions.

First, referring to FIG. 3, an initial formation angle of Ray that is emitted from the center of the surface light source LED 1 and reaches the rear of the light distribution control unit 111 is referred to as "α".

The formation angle formed between the light reaching the rear light distribution control unit 121 and the free curved surface of the rear light distribution control unit 121 at the rear of the light distribution control unit 111 is referred to as "β",

Formed between the light that is totally reflected from the free surface of the rear light distribution control unit 121 and is refracted forward after reaching the free surface of the outer surface (L1) side of the rear body 120 and the free surface behind the outer surface (L1) When the angle is called "γ",

The rear light distribution control unit 121 of the inner surface L2 for controlling the rear light emission emitted backward from the surface light source LED 1 satisfies β> 42 ° and γ <90 ° when α = 9 °. = 18 °, it satisfies 44 ° <β <46 °, 65 <γ <70 °, and when α = 27 °, it has a free surface that satisfies 42 ° <β <44 °, 60 <γ <65 ° It is preferable to form.

FIG. 4 shows a result of simulating whether the light distribution control unit 111 and the rear light distribution control unit 121 having the total reflection structure in the present invention satisfy the above conditions.

At this time, in the ray_1 emitted from the center of the surface light source LED 1, β = 44.71 ° and γ = 84.15 ° when α = 9 °, and β> 42 ° and γ <90 ° when α = 9 °. I'm satisfied.

For Ray_2 emitted from the center of the surface light source COB LED 1, β = 44.99 ° and γ = 67.54 ° when α = 18 °, and 44 ° <β <46 °, 65 when α = 18 ° <γ <70 ° is satisfied.

In Ray_3 emitted from the center of the surface light source COB type LED 1, β = 43.85 ° and γ = 62.19 ° when α = 27 °, and when α = 27 °, 42 ° <β <44 °, 60 <γ <65 ° is satisfied.

In addition, the lens structure (L) with reference to Figure 5, the length in the X-axis direction from the front body 110 to the rear body 120 is referred to as "A",

The central side length in the X-axis direction with respect to the rear body 120 is referred to as "B",

The length of the Y-axis direction at the boundary point between the front body 110 and the rear body 120 is referred to as "C",

When standardizing the diameter of the surface light source LED 1 to 1 (mm), 3 <A <3.6 (mm), 1 <B <1.2 (mm), 5.5 <C <6.6 (mm) It is preferable to form.

In the present invention, the diameter of the surface light source LED (1) was applied to 22 (mm), for which A = 72.3mm, B = 24.5mm, C = 131mm to configure the optical system 100, this standardization The above conditions are satisfied as A = 3.29 (mm), B = 1.11 (mm), and C = 5.95 (mm).

In the present invention, the lens structure L may be controlled in a form having a higher distribution ratio by adjusting the conic constant and coefficient by the aspherical surface.

FIG. 6 is simulation data obtained by measuring a radiation distribution when a surface light source LED 1 is applied to a surface light source LED optical system 100 capable of controlling back light according to the present invention having the configuration as described above. Due to the structure of the light distribution control unit 111 and the rear light distribution control unit 121 having a complex total reflection structure, the light distribution distribution (road side) distributed more than the rear light distribution distribution (housing side) is made. Is showing.

Figure 7 is applied to the surface light source LED optical system (100) capable of controlling the rear light distribution according to the present invention having the configuration as described above when using the surface light source LED (1) road side (SS) and residential side As the simulation data measuring the light quantity ratio of (HS), the roadside side (SS) = residential side side (HS) = 80:20 for the surface light source LED 1 through the function of the optical system 100 according to the present invention. It is showing the distribution.

8 is a simulation data comparing the effect of the rear light distribution control when the surface light source LED (1) is applied to the surface light source LED optical system 100 capable of controlling the rear light distribution according to the present invention having the configuration as described above when used as a street light As shown in (d) to which the optical system 100 according to the embodiment of the present invention is applied, it shows that the most excellent post light distribution control effect is performed.

Figure 9 shows a LED lighting device for a street light or security lamp applying the optical system for the surface light source LED capable of controlling the rear light distribution according to the present invention, street light applying 25W COB type LED as the surface light source to the optical system 100 of the present invention. Is an illustration showing the LED lighting device 200, for controlling the overall light distribution, including the rear light distribution control for the emission light of the surface light source LED disposed in the lower through the optical system 100 for the use of street lights or security lights. You can make the street or residential area bright enough.

10 is simulation data of a LED lighting device for a street lamp or a security lamp to which the light distribution LED optical system capable of controlling rear light according to the present invention is applied, and the lighting grade is ME2, and thus the optical system for the surface light source LED of the present invention. It is shown that the LED lighting device including the 100 can be used for both street lamps or security lights as needed.

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 and variations are 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: surface light source LED 100: optical system
110: front body 111: light distribution control unit
120: rear body 121: rear light distribution control unit
200: LED lighting device
L: lens structure
L1: exterior
L2: Inside

Claims (5)

In the optical system for controlling the overall light distribution of the surface light source LED, but to improve by controlling the rear light emission emitted to the rear side,
A front lens body and a rear body structured in different shapes to form a lens sphere;
The lens structure,
Convex free-form surfaces having ridges on the front body and the rear body, respectively, are continuously connected to the outer surface,
It is formed in a free curved surface to have an indented form toward the outer surface at the central portion of the optical system with respect to the inner surface and is formed in a free curved surface so as to have an indented form toward the outer surface in the rear of the optical system and the light distribution control unit where the surface light source LED is disposed. An optical system for a surface light source LED capable of post-distribution control, comprising a rear light distribution control unit for controlling the rear light distribution of the emitted light of the surface light source LED in progress. The method of claim 1,
An initial forming angle that is emitted from the center of the surface light source LED and reaches the rear of the light distribution control unit is referred to as "α",
The formation angle formed between the light reaching the rear light distribution control unit from the rear of the light distribution control unit and the free curved surface of the rear light distribution control unit is referred to as "β",
When the angle of formation formed between the light that is totally reflected from the free curved surface of the rear light distribution control unit and reaches the free curved surface behind the outer surface and is refracted forward and the free curved surface behind the outer surface is "γ",
The rear light distribution control unit of the inner surface for controlling the rear light distribution,
when α = 9 °, satisfying β> 42 °, γ <90 °,
when α = 18 °, it satisfies 44 ° <β <46 °, 65 <γ <70 °,
An optical system for a surface light source LED capable of back light control, characterized in that it has a free curved surface satisfying 42 ° <β <44 ° and 60 <γ <65 ° when α = 27 °. The method of claim 1,
The lens structure,
The length in the X axis from the front body to the rear body is called "A",
The length of the central side in the X axis direction with respect to the rear body is called "B",
The length in the Y-axis direction at the boundary between the front and rear bodies is called "C",
When normalizing the diameter of the surface light source to 1 (mm),
3 <A <3.6,
1 <B <1.2,
An optical system for a surface light source LED capable of controlling rear light, characterized in that formed in a size satisfying 5.5 <C <6.6. The method of claim 3, wherein
The lens structure,
The anterior body is longer than the posterior body in length in the Y axis direction,
An optical system for a surface light source LED capable of controlling rear light, characterized in that the front body is formed higher in the outer ridge than the rear body. An optical system for a surface light source LED capable of controlling the rear light distribution according to any one of claims 1 to 4; Including, but for the street light or security light LED, characterized in that configured to illuminate the road or residential area by controlling the overall light distribution, including the rear light distribution control for the emission light of the surface light source LED disposed below through the optical system Lighting equipment.

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