KR100959511B1 - Illumination system including asymmetrical reflector and condenser lens - Google Patents

Abstract

PURPOSE: An LED(Light Emitting Diode) lighting device is provided to control the center illuminance by appropriately controlling the location of condensing lenses and unit reflectors. CONSTITUTION: An optical source part(20) comprises a circuit board(21), a plurality of LED packages(23), and a plurality of condensing lenses(25). A plurality of LED packages are installed on the circuit board. A unit reflector is arranged on a part of LED packages among a plurality of LED packages. The unit reflector has a light guide hole. The both side reflection sidewall of the light guide hole has an asymmetry angle of inclination. The condensing lens is arranged on the rest LED package.

Description

Light emitting diode illuminator with asymmetric reflector and condenser lens {Illumination system including asymmetrical reflector and condenser lens}

The present invention relates to a light emitting diode illuminator, and more particularly, to a light emitting diode illuminator having a reflector and a condenser lens.

Light emitting diodes (LEDs) are attracting attention as light sources for next generation lighting due to their low power consumption, long lifetime, low driving voltage, and environmental friendliness. LED illuminators employing such LEDs as light sources have been widely applied to industrial, agricultural and commercial applications.

On the other hand, the light distribution for the illumination light source may be adjusted according to the type of light to be illuminated. To solve this, there is a method of giving an inclination angle to the body of the LED illuminator. However, in this case, the light distribution shape should be considered when designing a mold for injecting the main body, and it is difficult to diversify the light distribution shape after the main body is manufactured.

The problem to be solved by the present invention is to provide a light emitting diode illuminator that can easily adjust the light distribution form.

One aspect of the present invention to achieve the above object provides a light emitting diode illumination device. The lighting device has a light source unit. The light source unit includes a circuit board and a plurality of LED packages mounted on the circuit board. Unit reflectors including light guide holes are respectively located on some of the LED packages. Both reflective side walls of each of the light guide holes have an asymmetric inclination angle. Condensing lenses are respectively located on the remaining LED packages.

The LED packages may be arranged in a matrix to form an LED package array, and the unit reflectors may be positioned on LED packages provided in columns positioned at both ends of one direction of the LED package array.

The inclination angle of the reflection side wall adjacent to the center direction of the LED package array among the two reflection side walls of the light guide hole may be greater than the inclination angle of the reflection side wall adjacent to the outer direction of the LED package array.

The unit reflectors positioned on the LED packages provided in the one row may be connected to each other to form a reflector module.

Both reflective side walls may include reflection protrusions.

The lighting apparatus may further include a main body having a storage space accommodating the light source unit, a heat sink disposed under the storage space, and a first support supporting the main body. The body portion may rotate relative to the first support. The second support may be disposed to support the first support. In this case, the first support may rotate with respect to the second support.

According to the present invention, unit reflectors having light guide holes are disposed on some LED packages of the plurality of LED packages, wherein both side reflection walls of the light guide holes have an asymmetric inclination angle, and a condenser lens is disposed on the remaining LED packages. Place it. As a result, the unit reflectors incline the optical axis of the LED package relative to the vertical axis, and the condensing lenses condense the light while maintaining the optical axis of the LED package, so that when the position of the unit reflectors and the condensing lenses is properly adjusted, The light distribution type and the center illuminance of the light emitted from the LED illuminator can be adjusted appropriately.

The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to describe the present invention in more detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

1A, 1B, and 1C are exploded perspective views, a top perspective view, and a bottom perspective view of a light emitting diode (LED) lighting apparatus according to an embodiment of the present invention, respectively.

1A, 1B, and 1C, the LED lighting device 100 includes a main body 10. The main body 10 includes a storage space 10h and a heat sink 15 below the storage space 10h.

The storage space 10h may be defined by a bottom surface 10b and a side wall 10s surrounding the bottom surface 10b. The bottom surface 10b may have a substantially flat shape.

The light source unit 20 may be accommodated in the storage space 10h, that is, on the bottom surface 10b. The light source unit 20 includes a circuit board 21. The circuit board 21 may be a printed circuit board (PCB). A plurality of LED packages 23 are mounted on the circuit board 21. Unit reflectors 27 including light guide holes may be disposed on some of the LED packages 23. Both reflective side walls of each of the light guide holes have an asymmetric inclination angle. Condensing lenses 25 may be disposed on the remaining LED packages 23, respectively. Details of the light source unit 20 will be described later.

The heat sink 15 may play a role of dissipating heat generated by the driving of the LED packages 23 to the outside. Therefore, the body part 10 including the heat sink 15 may be made of a metal having excellent thermal conductivity, for example, aluminum so that heat generated from the LED packages 23 may be well discharged.

A transparent cover 30 may be disposed on the main body 10 to transmit light emitted from the LED packages 23, and a sealing ring 35 may be disposed on an outer circumference of the transparent cover 30. ) May be arranged. A cover holder 40 may be disposed on the transparent cover 30 to accommodate at least a part of the side wall 10s of the main body 10, the transparent cover 30, and the sealing ring 35. The cover holder 40 and the main body 10 may be coupled by a coupling member (not shown).

The first support 60 may be connected to the main body 10. The first support 60 may include a central portion 60b and a pair of arms 60a protruding from both ends of the central portion 60b. The arms 60b may be coupled to the main body 10 by a coupling member 63. The coupling member 63 may be a screw.

A power supply unit 70 having power circuit devices may be disposed on the central portion 60b of the first support.

A second support 80 may be disposed below the central portion 60b of the first support, and the first support 60 and the second support 80 may be connected by a connection portion 85. The second support 80 may have a groove 80a that may be connected to another support means.

FIG. 2 is a detailed perspective view illustrating a light source unit of the LED lighting apparatus illustrated in FIG. 1.

Referring to FIG. 2, a plurality of LED packages 23 are mounted on the circuit board 21. The LED packages 23 constitute an LED package array 23ar arranged in a matrix having columns and rows. As an example, the LED package array 23ar has n LED package columns C ₁ , C ₂ , C _n-1 , C _n and m LED package rows L ₁ , L ₂ , L _m . can do. The columns C ₁ , C ₂ , C _n and the rows L ₁ , L ₂ , L _m may be interchangeably named. Also, the angle formed by the columns and rows does not necessarily have to be perpendicular.

The unit reflectors 27 including the light guide holes 27a may be disposed on some of the LED packages 23. Both reflective side walls of each of the light guide holes 27a have an asymmetric inclination angle. Condensing lenses 25 may be disposed on the remaining LED packages 23, respectively.

Meanwhile, the unit reflectors 27 may be connected to each other to constitute the reflector assembly 27s. In other words, the reflector assembly 27s may be disposed on one column of the LED package array 23ar, and each reflector assembly 27s corresponds to the LED packages 23 provided in one column, respectively. A plurality of unit reflectors 27 may be provided.

3 is a cross-sectional view taken along the cutting line A-A 'of FIG.

2 and 3, the unit reflector 27 is disposed on the LED package 23. The unit reflector 27 includes a light guide hole 27a, and the LED package 23 is exposed in the light guide hole 27a. The light guide hole 27a may include reflection side walls 27b and 27c for reflecting light, and the diameter thereof may gradually increase along the traveling direction of the light. On the other hand, both side walls of the light guide hole 27a have different inclination angles, that is, asymmetric inclination angles. As a result, the optical axis Lc1 of the LED package 23 may be inclined relative to the vertical axis.

As an example, the inclination angle of the reflection side wall 27c adjacent to the center direction of the LED package array 23ar among the reflection side walls of the light guide hole 27a is reflected near the outer direction of the LED package array 23ar. It may be larger than the inclination angle of the side wall 27b. In this case, the optical axis Lc1 of the LED package 23 may be inclined outward of the LED package array 23ar.

4 is a cross-sectional view taken along the line BB ′ of FIG. 2.

2 and 4, the light collecting lens 25 is disposed on the LED package 23. The condenser lens 25 may condense the light emitted from the LED package 23 and maintain the optical axis Lc2 on the vertical axis.

Referring back to FIG. 2, the unit reflectors 27 tilt the optical axis of the LED package relative to the vertical axis, and the condenser lenses 25 condense the light while maintaining the optical axis of the LED package. 27) and when the positions of the condenser lenses 25 are properly adjusted, the light distribution type and the center illuminance of the light emitted from the LED lighting apparatus 100 may be appropriately adjusted.

As an example, unit reflectors 27 are respectively disposed on LED packages 23 located at both ends of one direction of the LED package array 23ar, and condensing lenses 25 are disposed on the remaining LED packages 23. ) May be arranged respectively. More specifically, the unit reflectors on the LED packages 23 provided in at least one column (C ₁ and C ₂ ) located at one end and at least one column (C _n and C _n-1 ) located at the other end 27 may be disposed respectively, and condensing lenses 25 may be disposed on the LED packages 23 disposed in the remaining columns C ₃ , C ₄ , and C _n-2 .

5 is a cross-sectional view taken along the line C-C 'of FIG.

2 and 5, unit reflectors 27 are respectively disposed on LED packages 23 positioned at both ends of one direction of the LED package array 23ar, and the unit reflectors 27 are disposed on the LED packages 23. The inclination angle of the reflection side wall 27c adjacent to the center direction of the LED package array 23ar among the two reflection side walls of the light guide hole 27a is the inclination angle of the reflection side wall 27b adjacent to the outer direction of the LED package array 23ar. Can be larger than In this case, the optical axis Lc1 of the LED packages 23 positioned at both ends may be inclined outward of the LED package array 23ar. Therefore, as an example of one side direction of the LED lighting apparatus 100, the horizontal view angle may be wider than the vertical direction angle. As a result, the light distribution shape of the LED lighting device 100 may be close to an elliptical shape.

Meanwhile, condensing lenses 25 may be disposed on the remaining LED packages 23, respectively, to properly maintain the center illuminance of the LED lighting apparatus 100.

As a result, the LED lighting apparatus according to an embodiment of the present invention can easily adjust the light distribution shape without changing the angle of the bottom surface 10b of the body portion 10, the center illumination can also be properly maintained.

6A is a top view of the light source unit according to the exemplary embodiment of the present invention, and FIG. 6B is a top view of the light source unit of the LED lighting apparatus according to the comparative example.

Referring to FIG. 6A, the unit reflectors on the LED packages 23 arranged in a pair of rows located at one end of the 11 LED package rows and a pair of rows located at the other end, that is, a total of four rows. (27) were placed respectively, and condensing lenses 25 were placed on the LED packages 23 arranged in the remaining rows, respectively.

Referring to FIG. 6B, condensing lenses 25 are disposed on LED packages 23 arranged in all eleven LED package rows.

FIG. 7A illustrates an illuminance curve of the LED lighting apparatus having the light source unit illustrated in FIG. 6A, and FIG. 7B illustrates an illuminance curve of the LED lighting apparatus having the light source unit illustrated in FIG. 6B.

Referring to FIGS. 7A and 7B, the LED lighting apparatus according to the embodiment (FIG. 6A) has a light distribution shape that is close to an oval shape. In other words, the longitudinal orientation angle was smaller than the horizontal orientation angle. On the other hand, the LED lighting apparatus according to the comparative example (Fig. 6b) was shown that the light distribution shape is close to the circular. In other words, the horizontal orientation angle and the vertical orientation angle were almost similar.

Meanwhile, the center illuminance of the LED illuminator according to the embodiment (FIG. 6A) was measured at 288 lux, and the center illuminance of the LED illuminator according to the comparative example (FIG. 6B) was measured at 389 lux.

In summary, unlike the LED lighting apparatus according to the comparative example (FIG. 6B), the LED lighting apparatus according to the embodiment (FIG. 6B) may implement an elliptical light distribution form in which the horizontal direction angle and the vertical direction angle are different from each other. Able to know. In addition, it can be seen that the LED lighting apparatus according to the embodiment (FIG. 6A) is maintained at a good level even though the center illuminance is slightly lower than that of the LED lighting apparatus according to the comparative example (FIG. 6B).

From this, it can be seen that the LED lighting apparatus according to an embodiment of the present invention is suitable for illuminating an object to which the aspect ratio is not 1, for example, a pedestrian crossing.

8A and 8B are side and bottom views respectively illustrating a rotation operation of the LED lighting apparatus shown in FIG. 1.

Referring to FIG. 8A, the main body 10 of the LED lighting apparatus 100 may rotate with respect to the first support 60. This rotation may be performed with respect to the coupling member 63 for coupling the body portion 10 and the first support 60. In this case, the light center of the LED lighting device 100 can be rotated from the direct direction to the side direction. The maximum rotation angle may be about 180 degrees.

Referring to FIG. 8B, the first support 60 and the main body 10 of the LED lighting apparatus 100 may rotate with respect to the second support 80. This rotation may be performed about the connection portion 85 of FIGS. 1A, 1B, and 1C between the first support 60 and the second support 80. As described above, when the LED lighting device 100 has an elliptical light distribution shape, the rotation of the elliptical long axis direction may be appropriately changed to the object to be illuminated. The maximum rotation angle may be about 360 degrees.

9 is a cross-sectional view showing a part of a light source unit of the LED lighting apparatus according to another embodiment of the present invention, and is similar to the LED lighting apparatus described with reference to FIG.

Referring to FIG. 9, the reflection side walls 27b and 27c of the light guide hole 27a may include reflection protrusions 27d. As an example, the reflective side walls 27b and 27c may have reflecting protrusions 27d protruding from the surface thereof. The reflection protrusions 27d may diffusely reflect light to improve hot spots caused by light non-uniformity, and may also alleviate glare due to light generated from the LED package.

While the invention has been described above with reference to specific preferred embodiments, it is intended that the specific modifications and variations of the invention fall within the scope of the invention and the specific scope of the invention will be apparent from the appended claims.

1A, 1B, and 1C are exploded perspective views, a top perspective view, and a bottom perspective view of a light emitting diode (LED) lighting apparatus according to an embodiment of the present invention, respectively.

FIG. 2 is a detailed perspective view illustrating a light source unit of the LED lighting apparatus illustrated in FIG. 1.

3 is a cross-sectional view taken along the cutting line A-A 'of FIG.

4 is a cross-sectional view taken along the line BB ′ of FIG. 2.

5 is a cross-sectional view taken along the line C-C 'of FIG.

6A is a top view of the light source unit according to the exemplary embodiment of the present invention, and FIG. 6B is a top view of the light source unit of the LED lighting apparatus according to the comparative example.

FIG. 7A illustrates an illuminance curve of the LED lighting apparatus having the light source unit illustrated in FIG. 6A, and FIG. 7B illustrates an illuminance curve of the LED lighting apparatus having the light source unit illustrated in FIG. 6B.

8A and 8B are side and bottom views respectively illustrating a rotation operation of the LED lighting apparatus shown in FIG. 1.

9 is a cross-sectional view showing a part of a light source unit of the LED lighting apparatus according to another embodiment of the present invention.

Claims (7)

Circuit board; A plurality of LED packages mounted on the circuit board and arranged in a matrix to form an LED package array; Unit reflectors each disposed on LED packages included in columns positioned at both ends of one direction of the LED package array and having light guide holes, and both side reflection side walls of the light guide holes have an asymmetric inclination angle. The inclination angle of the reflection side wall adjacent to the center direction of the LED package array among the two reflection side walls of the hole is larger than the inclination angle of the reflection side wall adjacent to the outer direction of the LED package array; And Light emitting diode illumination device comprising a light source unit having condensing lenses respectively positioned on the remaining LED packages. delete delete The method of claim 1, The light emitting diode illumination device of each of the unit reflectors positioned on the LED package provided in the one row is connected to each other to form a reflector assembly. The method of claim 1, And both side reflection walls have reflecting protrusions protruding from the surface thereof. The method of claim 1, A main body having a storage space accommodating the light source unit and a heat sink disposed under the storage space; And Including a first support for supporting the body portion, And a main body portion rotatable with respect to the first support. The method of claim 6, And a second support for supporting the first support, wherein the first support is rotatable relative to the second support.

Images