KR101387625B1 - Optical system for led spotlight and led spotlight included the same - Google Patents

Abstract

The present invention relates to an optical system for LED spotlights and an LED spotlight including the same, and is formed as an aspherical surface for improving aberration, and induces spot light primarily by controlling light by refraction and reflection with respect to divergent light of an LED as a light source. Aspherical reflectors for forward emission; The lens structure is positioned in contact with the upper side of the aspherical reflector, and formed into an aspherical surface for improving aberration, and collects the light leaking outward with respect to the emitted light primarily adjusted by the aspherical reflector to the center. In addition, aspherical lens for inducing a uniform light distribution while narrowing the emission angle of the spot light through the secondary light control; The present invention relates to an optical system for LED spotlight and an LED spotlight including the same.

Description

Optical system for LED spotlights and LED spotlights including the same {OPTICAL SYSTEM FOR LED SPOTLIGHT AND LED SPOTLIGHT INCLUDED THE SAME}

The present invention relates to a spotlight (LED) spotlight, and more particularly to a multi-chip packaged LED or OLED of a COB type LED module or a COM type LED module having a divergent light in the form of a surface light source LED light source of the spotlight The present invention relates to an optical system for LED spotlights and an LED spotlight including the same, which can be usefully adopted and applied, and effectively improves aberration for a large number of poor performances caused by conventional LED intensive lights.

Recently, in response to the low carbon green growth, LED lighting with LEDs with low power consumption, long life, fast response and space saving as a light source has been actively promoted. Efforts are being made for more effective and efficient use, such as controlling light.

For example, a spotlight, which is a lighting device that is widely used in various fields such as a lighthouse, a fishing lamp, and a car headlight, is used to focus a certain portion or a predetermined subject, and is a spot in an LED light. Implementing light collection efficiency to make light is an important factor.

In addition, looking into the LED lighting market by field, LED spotlight is a trend that is gradually increasing in the size of the market, with the spread of LED lighting is active, there is a need for a variety of studies on efficiency improvement.

Figure 1 shows an example of a conventional LED spotlighting apparatus for making spot light, a packaged LED module and the primary lens in a state that the primary lens 10 is covered in the LED chip 30 used as a light source Comprising a configuration including a secondary lens 20 mounted on the (10), through the lens portion of the primary lens 10 and the secondary lens 20, the light emitted from the LED chip 30 as a light source The control is carried out by spot processing.

However, in the conventional centralized LED lighting apparatus having the structure as shown in FIG. 1, since the lens units of the primary lens 10 and the secondary lens 20 use only the reflection or refraction action of light, There was a problem that the light adjustment efficiency is low, because there is a low degree of freedom for adjustment, there was also a problem inferior in homogeneity.

In addition, Figure 9 (a) shows a light pattern for a conventional intensive LED lighting device having a structure as shown in Figure 1, as well as the problem of forming a band pattern such as a yellow band around the optical uniformity and light efficiency This fall can be confirmed, and the light control rate is not properly performed, which exposes many problems.

Furthermore, the secondary lens 20 for inducing the final spot treatment for the divergent light of the LED chip 30, which is a light source, is difficult to change the use according to the scale, and emits a chip on board (COB) that emits divergent light in the form of a surface light source. Type or COM (Chip On Metal) type multi-chip packaged LED has never been applied as a spotlight for spotlights, and there are technical difficulties in applying multi-chip packaged LEDs as spotlights. Even if these multichip packaged LEDs are applied to spotlights, it is difficult to expect improvement in performance and lighting efficiency.

In addition, the secondary lens 20 used in the conventional LED intensive lighting device has a problem in that the injection molding is difficult and the productivity is inferior, and the light adjustment angle with respect to the LED light source when using a large area high power (high power) There is a disadvantage in that is widened, and in order to overcome this problem, the size (length) of the secondary lens 20 should be considerably increased, and thus the problem that the lamp itself becomes large will occur.

SUMMARY OF THE INVENTION The present invention has been made in view of solving the problems described above, and in view of the above, it is useful to use a COB type or COM type multi-chip packaged LED or OLED having a surface light source of divergent light as an LED light source of a spotlight. It can be adopted and applied, it is possible to increase the degree of freedom due to aberration adjustment through the structural analysis design by utilizing aspherical surface and aberration control, and it is possible to improve many performance defects (band pattern formation, optical homogeneity) that occurred in conventional LED spotlights. Optical system for LED spotlights, which can effectively improve optical aberration for the degree of light efficiency, decrease in light efficiency, high light intensity, etc., and to produce optimized spot light within 20 degree of light distribution angle while minimizing light loss. The purpose is to provide an LED spotlight.

The present invention is to enable the spotlight lighting of a large area, high power, and to promote the miniaturization of the light, to satisfy the maximum lighting efficiency with the minimum electric energy, and also to meet the mass-production optical system for LED spotlight and The purpose is to provide an LED spotlight comprising the same.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical system for LED spotlights and LED spotlights including the same, which can be used for various applications from low power such as personal lighting or bicycle lamps to high power such as automobile lamps and lighthouses.

The optical system for LED spotlight of the present invention for achieving the above object is to apply and light control the multi-chip package type LED or OLED of the COB type LED module or COM type LED module as the LED light source; An aspherical reflector provided with a reflecting surface having positive (+) refractive power as an aspherical surface of a lower narrow light type whose diameter is expanded toward an emission side of the LED light source; A first optical surface positioned on the light source exit side of the aspherical reflector, the first optical plane being formed as an aspherical surface having a negative refractive power toward the incidence side of the LED light source, and an aspherical surface having a positive refractive power on the exit side of the LED light source An aspherical lens having a second optical surface formed; And a control unit.

Preferably, the aspherical reflector, the base layer formed of a polar polymer material; An aluminum layer coated on the base layer; A dielectric layer coated on the aluminum layer; The dielectric layer may be formed of a low refractive dielectric having a refractive index of 1.4 to 1.5 range.

Preferably, the aspherical lens is a lens structure consisting of any one selected from polymethyl methacrylate (PMMA), cycloolefin copolymer (COC), polycarbonate (PC), glass, silicone; It can be configured to have positive refractive power as a whole.

Preferably, the light emitting surface diameter of the LED light source to which the COB type or COM type multi-chip packaged LED or OLED is applied is referred to as "S", and the distance from the lower end to the upper end of the aspheric reflector is referred to as "H". When the upper end diameter of the aspherical reflector is referred to as "D",

Condition 1) With 2S <H <3S,

Condition 2) 3S <D <4S can be formed to satisfy.

On the other hand, the LED spotlight of the present invention for achieving the above object is characterized in that it comprises the above-described optical system for LED spotlight.

According to the present invention, COB-type or COM-type multi-chip packaged LEDs or OLEDs (organic light-emitting diodes) having surface light emission can be usefully adopted as LED light sources of spotlights, and existing LEDs can be concentrated. It is possible to achieve a useful effect to improve optical aberration for a large number of poor performance, such as band pattern formation around the light generated in the illumination, light homogeneity, light efficiency, low light intensity.

The present invention can improve the degree of freedom and light control efficiency according to the aberration adjustment by utilizing the aspherical surface and the structural analysis design by the aberration control, according to the COB type or COM type having a divergent light in the form of surface light source Even when the multi-chip packaged LED or OLED is applied as an LED light source, it can be usefully controlled with spot light within 20 degrees of the final emission angle (light distribution angle) while minimizing light loss, and makes it easier to control a large area high power spotlight lighting. Not only can it be implemented, but also it can achieve the miniaturization of spotlight lighting, while achieving the usefulness of satisfying the maximum lighting efficiency with minimum electric energy.

The present invention can be changed according to the scale of the optical system, and can be useful for various applications from low power for personal lighting or bicycle lamps to high power for automobile lamps or lighthouses.

1 is a view showing an example of the configuration of a conventional LED concentrated lighting device.
Figure 2 is a block diagram showing an optical system for LED spotlight according to an embodiment of the present invention.
Figure 3 is a block diagram showing an LED spotlight including the optical system for LED spotlight according to an embodiment of the present invention.
Figure 4 is a view showing a cross-sectional layer structure for the aspherical reflector in the optical system for LED spotlight according to an embodiment of the present invention.
5 is a simulation data showing the ray tracing state of the optical system for LED spotlight according to the present invention.
6 is simulation data showing the light distribution density by distance of the LED spotlight including the optical system for LED spotlight according to the present invention.
7 is a simulation data showing the radiation pattern of the LED spotlight including the optical system for LED spotlight according to the present invention.
8 is simulation data showing an RGB chart for each distance of an LED spotlight including the optical system for LED spotlights according to the present invention.
9 is a comparison data showing the light pattern of the LED spotlight including the optical pattern of the conventional LED spotlight and the LED spotlight optical system 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.

2 to 5, the optical system 100 for LED spotlights according to an embodiment of the present invention includes one aspherical reflector 110 and one aspherical lens 120.

The aspheric reflector 110 is to induce spot light primarily by controlling the light by the refraction and reflection action with respect to the divergent light of the LED light source 210, and emits the light forward to the inner wall, the light source is emitted to the inner wall Reflective surface 111 is provided with a lower side narrow light type curved surface extending in diameter in the lateral direction, and is formed in an open structure in which the upper and lower ends are opened to emit light in the front and LED in the rear. The light source 210 is configured to be disposed.

The reflective surface 111 is made of an aspherical surface, it is preferable to form to have a positive (+) refractive power.

At this time, the aspherical reflector 110, as shown in Figure 4, the base layer (110a) formed of a synthetic resin of a polar polymer material, the aluminum layer (110b) coated on the base layer (110a), and It is preferable that the dielectric layer 110c is coated on the aluminum layer 110b.

The base layer 110a may provide ease of forming the aspherical reflector 110 by using a synthetic resin, and may be coated to increase reflection efficiency by using a polymer material having polarities such as ABS resin or PE and PMMA. Affinity with the aluminum layer 110b, which is a metal material, can be increased, thereby improving coating efficiency.

The aluminum layer 110b is intended to have a heat dissipation function capable of emitting heat while improving the reflection efficiency of the light emitted from the LED light source 210, and it will be said that the coating process is performed in a plasma manner.

The dielectric layer 110c serves to protect the aluminum layer 110b to increase reflection efficiency and to prevent oxidation of the aluminum layer 110b and to prevent a decrease in reflectance.

Preferably, the dielectric layer 110c is formed of a low refractive dielectric having a refractive index of 1.4 to 1.5, and examples thereof include TiO ₂ , MgF ₂ , and SiO ₂ .

The aspherical lens 120 collects light leaking outward with respect to the emission light primarily adjusted by the aspherical reflector 110 to the central portion, and narrows the emission angle of the spot light through the secondary light control. In order to induce a uniform light distribution, any one selected from poly methyl methacrylate (PMMA), cyclo olefin copolymer (COC), polycarbonate (PC), glass, silicon Consists of one type of lens structure, it may be desirable to form a convex shape in order to narrow the radiation angle of light.

At this time, the aspherical lens 120 is located on the light source exit side of the aspherical reflector 110, the first optical surface 121 of the concave surface having a negative refractive power toward the incident side of the light source and the light source A convex second optical surface 122 having a positive refractive power is provided on the exit side.

The aspherical lens 120 is made of both aspherical surface and the inner and outer surfaces, it is preferable to form so as to have a positive (+) refractive power as a whole.

Here, the first optical surface 121 is responsible for collecting and catching the light leaking in the outward direction to the central portion with respect to the emission light primarily adjusted by the aspherical reflector 110, the second optical surface Reference numeral 122 serves to induce a uniform light distribution while narrowing the emission angle of the spot light through the secondary light control.

The aspherical lens 120 may be manufactured by a molding process of a glass molding press (GMP; a method of applying heat to a material), and injection molding is possible using such a glass molding press molding process. It can reduce the thickness, improve the optical performance, and can be molded at a very low temperature, so it is possible to minimize problems such as deformation and stress during mass production of the lens, thereby satisfying mass productivity. It may be desirable to.

In the optical system 100 for LED spotlight according to the present invention having such a configuration, the aspherical reflector 110 has a radiation angle of 40 to 60 degrees primarily with respect to the divergent light of the LED light source 210 as shown in FIG. Light control to form a light, as shown in (b) of FIG. 5, the aspherical lens 120 collects the light leaking from the emitted light controlled by the aspherical reflector 110 to the final through the secondary light control In addition to creating spot light forming a radiation angle concentrated within 20 degrees, a uniform light distribution is induced.

As described above, the optical system for LED spotlight 100 according to the present invention is a COB (Chip On Board) type LED module or COM (Chip On Metal) type LED of a surface light source through a structural analysis design by utilizing aspherical surface and aberration control. Multi-chip packaged LEDs such as modules or organic light emitting diodes (OLEDs) can be usefully applied as LED light sources 210 for spotlights that are intensive lights. The optical aberration can be all improved for a number of poor performances such as stripe pattern formation, light homogeneity reduction, light efficiency reduction, and high light intensity.

In addition, as shown in FIG. 3, the light emitting surface diameter (light emitting area) of the LED light source 210 to which the COB type or COM type multi-chip packaged LED or OLED having divergent light in the form of surface light source is applied is " S " The distance from the lower end to the upper end of the aspherical reflector 110 is referred to as "H", and the diameter of the upper end (part where the aspheric lens 120 is located) of the aspherical reflector 110 is referred to as "D". time,

It may be desirable to form to satisfy the following Conditional Expression 1 and Conditional Expression 2 below.

Conditional expression 1)

2S <H <3S

Conditional expression 2)

3S <D <4S

Here, the conditional expression 1 shows a value of comparing the distance from the lower end to the upper end of the aspherical reflector 110 with the diameter of the light emitting surface of the LED light source 210, the LED light source 210 is applied to the surface light source Equation 2 and having a relatively compact configuration for the aspherical reflector 110 that makes such a surface light source to a straight light, including the aspherical lens 120 is a condition of 3S <H <4S condition 2 It becomes similar to the maximum diameter (D) of the aspherical reflector 110 shown in, which indicates that it is possible to configure a relatively very compact optical system even if a large area light source is applied.

Conditional Expression 2 shows a value of comparing the diameter of the upper end (part where the aspherical lens 120 is located) of the aspherical reflector 110 with the diameter of the light emitting surface of the LED light source 210. It represents the conditions corresponding to the quantitative constraints for distinguishing the surface light source and the point light source.

Meanwhile, the LED spotlight 200 according to the embodiment of the present invention includes the technical configuration of the optical system 100 for LED spotlight described above with reference to FIGS. 2 to 5, and has a configuration as described above for the LED spotlight. The optical system 100 and the LED light source 210 by a multi-chip packaged LED or OLED including a COB type or a COM type having divergent light in the form of a surface light source will be made.

Accordingly, the LED spotlight 200 according to the present invention can be usefully used as a intensive light of a large area high power while expecting the optical performance and the force exerted through the optical system 100 for LED spotlight.

In addition, it may be said that the greater the lighting efficiency can be satisfied with a smaller electric energy than the conventional, if the conventional lighting efficiency of 100% electric energy to meet the lighting efficiency according to the intensive light, LED spotlight 200 of the present invention ), The lighting efficiency can be satisfied with only 25 ~ 50% of electric energy compared to the existing one.

On the other hand, Table 1 below shows aspherical data for the optical system for LED spotlight 100 according to the present invention.

Table 1. Aspherical data of optical system 100 for LED spotlight according to the present invention

Here, in Table 1, the reflective surface 111 of the aspherical reflector 110 has an aspherical curvature value, a conic constant and an aspheric surface coefficient, and the first surface of the aspherical lens 120. It is shown that the optical surface 121 has an aspherical curvature value and an aspherical surface coefficient, and the second optical surface 122 has an aspherical curvature value, a conic constant and an aspherical surface coefficient, which are aspherical curvature values and conic constants and As indicating that the aspherical surface coefficient can be adjusted, it indicates that the radiation path and the light distribution can be arbitrarily tuned freely with respect to the divergent light of the LED light source 210, indicating that the degree of freedom due to the aspherical surface can be increased.

Incidentally, in general, the rotationally symmetric high order aspherical surface about the optical axis can be expressed by the following equation.

That is, the aspherical equation is composed of a formula including a conic constant and an aspherical coefficient, and becomes a value representing an aspherical shape.

At this time, the equation excluding the aspherical surface coefficient may be represented by a spherical surface if K = 0, an ellipse if -1 <K <0, a parabolic surface if K = -1, and a hyperbolic curve if K <-1. By applying the meaning of aspherical surface coefficient, it is possible to increase the degree of freedom by the aspherical surface by adjusting the aspherical surface coefficient and design the aspherical surface freely. Through this, the radiation path of the divergent light of the LED light source 210 is compared with the conventional spherical application. And light distribution can be arbitrarily freely adjusted.

FIG. 6 is simulation data showing the light distribution density of the LED spotlight including the optical system for LED spotlights according to the present invention. Since the light distribution density for each distance is equal to 1m, 5m, 15m, 30, respectively, the light uniformity is shown. It is very good.

7 is a simulation data showing the radiation pattern of the LED spotlight including the optical system for LED spotlight according to the present invention, the half radiation angle of the bat-shaped light distribution curve (red portion) is 5 ~ 7.5 degrees, the overall radiation angle It is shown that it is formed within 20 degrees, which shows a numerical value and a radiation shape similar to the direction angle of the LED spotlight 200 according to the present invention.

8 is a simulation data showing the RGB chart of the LED spotlight including the optical system for LED spotlight according to the present invention, showing the same brightness for each distance at 1m, 5m, 15m, 30, respectively, the center round type This shows similar brightness from the center to the surroundings.

9 is comparative data showing the light pattern of the conventional LED spotlighting device and the light pattern of the LED spotlight including the optical system for LED spotlight according to the present invention, Figure 9b according to the present invention according to the prior art Compared with (a) of FIG. 9, a band pattern such as a yellow band is not formed and is removed, and no light is emitted. The present invention provides light control through the optical system of an aspherical reflector and an aspheric lens using an aspherical surface. It is shown that the optical aberration which can be performed more easily and produces the poor performance.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Modifications or substitutions may be made.

100: optical system for spotlight 110: aspherical reflector
111: reflective surface 120: aspherical lens
121: first optical surface 122: second optical surface
200: LED spotlight 210: LED light source

Claims (5)

Multi chip packaged LED or OLED (Organic Light Emitting Diode) of COB (Chip On Board) type or COM (Chip On Metal) type LED module is applied and light control as LED light source. Including a reflector and an aspherical lens;
The aspherical reflector is an open structure in which the upper and lower ends are open, and as an aspherical surface having positive (+) refractive power, which is a lower narrowing light type curved surface whose diameter extends toward the emission side of the LED light source on the inner wall. A reflective surface is formed;
The aspherical lens is positioned on the light source exit side of the aspherical reflector and has a first optical plane formed of an aspherical surface having a negative refractive power toward the incidence side of the LED light source, and positive refractive power toward the exit side of the LED light source. A second optical surface formed of an aspherical surface having;
The light emitting surface diameter of the LED light source to which the COB type or COM type multi-chip packaged LED or OLED is applied is referred to as "S", and the distance from the lower end to the upper end of the aspheric reflector is referred to as "H". When the upper end diameter of the aspherical reflector is "D", LED spotlight optical system, characterized in that it is formed to satisfy the following Conditional Expression 1 and Conditional Expression 2.
Conditional expression 1)
2S <H <3S
Conditional expression 2)
3S <D <4S The method of claim 1,
The aspherical reflector,
A base layer formed of a polar polymer material;
An aluminum layer coated on the base layer;
A dielectric layer coated on the aluminum layer; Lt; / RTI &gt;
The dielectric layer is an optical system for LED spotlight, characterized in that formed of a low refractive index dielectric having a refractive index range of 1.4 ~ 1.5. delete delete LED spotlight comprising the optical system for LED spotlight according to the claim 1 or 2.

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