WO2018004221A1

WO2018004221A1 - Led lens

Info

Publication number: WO2018004221A1
Application number: PCT/KR2017/006736
Authority: WO
Inventors: 김성빈; 김병욱
Original assignee: 주식회사 애니캐스팅
Priority date: 2016-06-28
Filing date: 2017-06-26
Publication date: 2018-01-04
Also published as: JP2018536286A; KR101821405B1; JP6530864B2; KR20180001791A

Abstract

The present invention relates to an LED lens capable of uniformly dispersing light emitted from an LED. The LED lens according to one embodiment of the present invention, which is an LED lens for uniformly dispersing light emitted from an LED, comprises: an incident surface through which light emitted from the LED is incident on the inside of the lens; and a light-emitting surface for emitting the light, incident on the inside of the lens through the incident surface, to the outside of the lens, wherein the light-emitting surface comprises: a first light-emitting surface that forms a convex curved shape on the LED side in a vertical cross-section; and a second light-emitting surface that is located around the first light-emitting surface, and forms a convex curved shape on the opposite side of the LED. A convex portion having an upwardly convex shape in the vertical cross-section is formed in a region of an inflection point existing at a portion where the first light-emitting surface and the second light-emitting surface are connected, and the convex portion can be formed in a circular band shape which surrounds the inflection points existing in a circular shape about the optical axis of the LED in a plane.

Description

LED lens

The present invention relates to an LED lens capable of evenly spreading the light from the LED.

In general, LED (Light Emitting Diode, LED) is widely used as a light source for indoor and outdoor lighting because of the high light conversion efficiency, the power consumption is relatively low, the response speed is fast, the lighting circuit is simple, and the safety is excellent.

However, in the case of using the LED as a light source, the light tends to diverge to a narrow area, and in order to apply it to the lighting device, it is necessary to distribute the light evenly over a wide area.

Representative prior art for the LED lens performing this function is US Patent No. 7348723.

However, the LED lens according to the prior art has a problem in that a circular band-shaped dark portion (darker portion than the periphery) occurs near the LED optical axis, and a hot spot (lighter portion than the periphery) occurs in the LED optical axis region. .

The present invention is to solve the above problems, and provides an LED lens that can improve the phenomenon that a circular band-shaped dark portion occurs near the LED optical axis, and the phenomenon that a hot spot occurs in the LED optical axis region.

In the LED lens according to an embodiment of the present invention, in the LED lens for evenly spreading the light emitted from the LED, the incident surface from which the light emitted from the LED is incident into the lens and the inside of the lens through the incident surface An emission surface for emitting light incident to the outside of the lens, the emission surface having a first exit surface forming a convex curved shape on the side of the LED on a vertical cross section, and positioned around the first exit surface; A convex portion having a convex portion having a convex shape upwardly in a vertical section, including a second exit surface forming a convex curved shape on an opposite side, and having an inflection point portion present at a connection portion between the first exit surface and the second exit surface; The convex portion may be formed in a circular band shape surrounding an inflection point existing in a circular shape about the optical axis of the LED on a plane. Can be.

In addition, the LED lens according to an embodiment of the present invention, the emission surface has a convex shape upward in the vertical cross-section, the first convex portion and the second convex portion having a planar circular band shape is further formed, The first block portion is formed on the first exit surface with a predetermined distance spaced from the convex portion to the first exit surface side, and the second convex portion is spaced a predetermined distance from the convex portion to the second exit surface side. It may be formed on the second exit surface.

In addition, in the LED lens according to an embodiment of the present invention, the first convex portion and the second convex portion may be symmetric with each other based on the convex portion on a vertical cross section.

According to the LED lens according to the embodiment of the present invention having the above configuration, the effect of improving the phenomenon that the circular band-shaped dark portion near the LED optical axis, and the phenomenon that the hot spot occurs in the LED optical axis region There is.

Effects according to the present invention are not limited to the above-mentioned effects, and other effects not mentioned above will be clearly understood by those skilled in the art from the claims and the detailed description. Could be.

1 is a vertical cross-sectional view showing an LED lens according to an embodiment of the present invention,

FIG. 2 is a schematic plan view of FIG. 1;

3 is a view showing a result of simulating the light distribution of light emitted through the lens of FIG.

4 is an enlarged view of a portion 'B' of FIG. 3,

5 is an enlarged view of a region 'A' of FIG. 1,

6 is a vertical sectional view showing the LED lens according to another embodiment of the present invention,

FIG. 7 is an enlarged view of region 'A' of FIG. 6.

FIG. 8 is a schematic plan view of FIG. 6;

9 is a vertical sectional view showing the LED lens according to another embodiment of the present invention,

10 is a schematic plan view of FIG. 9;

FIG. 11 is a diagram illustrating a result of simulating a light distribution of light emitted through the lens of FIG. 9.

FIG. 12 is an enlarged view of a portion 'B' of FIG. 11.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

While the invention allows for various modifications and variations, specific embodiments thereof are illustrated by way of example in the drawings and will be described in detail below. However, it is not intended to be exhaustive or to limit the invention to the precise forms disclosed, but rather the invention includes all modifications, equivalents, and alternatives consistent with the spirit of the invention as defined by the claims.

On the other hand, in the accompanying drawings, the thickness and size are exaggerated for clarity of the specification, and thus the present invention is not limited by the relative size or thickness shown in the accompanying drawings.

1 is a vertical cross-sectional view showing an LED lens according to an embodiment of the present invention.

Referring to FIG. 1, an LED lens 10 according to an embodiment of the present invention has an incident surface 20 in which light L1 emitted from the LED 11 is incident into the lens 10. And an emission surface 30 for emitting the light L2 incident into the lens 10 through the incident surface 20 to the outside of the lens 10.

In addition, the LED lens 10 according to an embodiment of the present invention is formed in the center of the bottom 13, the bottom 13, receiving groove 14, the bottom 13 and the exit surface for accommodating the LED 11 And a flange 17 connecting the 30 and protruding outward from the exit surface 30, and a leg 17 provided below the flange 15.

Here, the incident surface 20 may be made of the inner surface of the receiving groove (14).

That is, the light L1 emitted from the LED 11 accommodated in the accommodation groove 14 may be incident into the lens 10 through the entrance surface 20, which is the inner surface of the accommodation groove 14.

In addition, the exit surface 30 is positioned around the first exit surface 32 and the first exit surface 32 having a curved surface convex on the LED 11 side, that is, a downwardly convex curved surface, and the LED 11 is disposed. A second exit surface 34 having a convex curved shape on the opposite side, that is, a convex upward curved shape, and an inflection point 37 is present at the connection portion between the first exit surface 32 and the second exit surface 34. do.

As such, when the emission surface 30 includes the first emission surface 32 having the curved surface convex downward and the second emission surface 34 having the curved surface upward convex, the incident surface 20 The light L2 incident into the lens 10 may be emitted to the outside of the lens 10 through the emission surface 30 in an evenly diffused state.

FIG. 2 is a schematic plan view of FIG. 1.

As shown in FIG. 2, the planar shape of the entrance face 20 and the exit face 30 may have a substantially circular shape around the LED 11 optical axis 12, and the flange 15 may have an exit face. It may protrude from both sides to 30.

The first exit surface 32 is a center region including the LED 11 optical axis 12 among the planar regions of the exit surface 30, and the second exit surface 34 is the planar region of the exit surface 30. The inflection point 37 existing between the first exit surface 32 and the second exit surface 34 is an edge region surrounding the first exit surface 32 among the LED 11 and the optical axis 12 in plan view. It will exist in the form of a circle.

3 is a diagram illustrating a result of simulating a light distribution of light emitted through the lens of FIG. 1, and FIG. 4 is an enlarged view of a portion 'B' of FIG. 3.

Referring to FIGS. 3 and 4, the light distribution of the LED lens 10 according to FIG. 1 generates a dark portion b that is darker than the periphery of a substantially circular band near the optical axis 12 of the LED 11. In addition, the LED (11) optical axis 12 can be confirmed that the hot spot (h), which is a brighter part than the surroundings, but the light uniformity by the dark portion (b) and hot spot (h) as described above. The problem of falling.

5 is an enlarged view of an inflection point and an enlarged area 'A' of FIG. 1.

As shown in FIG. 5, light L3 exiting the lens 10 through the first exit surface 32, and light L4 exiting the lens 10 through the second exit surface 34. ) Forms a dark region C at the upper region of the inflection point 37. The dark region C causes a substantially circular band-shaped dark region b to occur near the optical axis 12 on the light distribution. do.

This is the shape of the first exit surface 32 and the second exit surface 34, that is, the first exit surface 32 has a curved surface convex downwards, while the second exit surface 34 has a curved surface upwardly convex It is because of the phenomenon.

In detail, as shown in the drawing, since the first exit surface 32 has a curved surface convex downward, and the second exit surface 34 has a curved surface convex upward, the first exit surface 32 Through the refraction angle of the light (L3) emitted to the outside of the lens 10 through the second exit surface 32, the refraction angle of the light (L4) emitted to the outside of the lens 10 through the difference occurs, thereby Since the angle of refraction of the light exiting the lens 10 is rapidly changed with respect to the inflection point 37 connected between the first exit surface 32 and the second exit surface 34, the region substantially above the inflection point 37. The light emitted to the remarkably decreases, whereby the dark region C is formed.

On the other hand, although not shown in the figure, the reason that the hot spot (h) occurs in the LED 11 optical axis 12, the reason, the Fresnel reflections generated when exiting the lens 10 through the exit surface 30 ( Fresnel reflection).

In other words, Fresnel reflection is a reflection generated when light passes through an interface between materials having different refractive indices. Some of the light exiting through the exit surface 30 by the Fresnel reflection is the bottom surface 20. The light reflected by the bottom surface 20 is reflected back from the bottom surface 20 and is directed toward the optical axis 12 portion. The hot spot h is generated at the optical axis 12 portion by the light. Will be done.

FIG. 6 is a vertical cross-sectional view illustrating an LED lens according to another exemplary embodiment. FIG. 7 is an enlarged view of an inflection point of FIG. 6 and is an enlarged view of region 'A' of FIG. 6. 6 is a schematic plan view.

In the LED lens 40 according to the present exemplary embodiment, a problem occurs in the light distribution distribution of the lens 10 according to FIG. 1, that is, a circular band-shaped dark portion b occurs near the LED 11 optical axis 12. And, to improve the phenomenon in which the hot spot (h) occurs in the optical axis 12, as compared to the lens 10 according to Figure 1, instead of removing the inflection point 37, the convex portion (37) 42), the detailed description of the other components and the reference numerals refer to the detailed description and reference numerals of the lens 10 according to FIG.

6 to 8, the LED lens 40 according to the present exemplary embodiment includes a convex portion 42 formed at a portion of the inflection point 37 and having a convex shape on the vertical cross section.

As such, when the convex portion 42 is formed at the inflection point 37, a circular band-shaped dark portion b generated in the light distribution distribution of the lens 10 according to FIG. 1, as shown in FIGS. 3 and 4. ) Can be improved.

In detail, as shown in FIG. 7, when the convex portion 37 is formed at the inflection point 37, the light L5 emitted to the outside of the lens 40 through the inflection point 37 is convex portion 37. By being emitted through), it is refracted in the direction of the dark portion region C generated when there is no convex portion 37, and is emitted. Accordingly, a circular band shape in the light distribution distribution generated by the dark portion region C is produced. It is possible to improve the dark portion (b) of the.

Furthermore, the convex portion 42 formed at the inflection point 37 scatters the light reflected by the Fresnel at the exit surface 30 from the bottom surface 13 to the LED optical axis 12. By converging above the inflection point 37, it is possible to improve the hot spot h at the optical axis 12 portion generated in the light distribution distribution of the lens 10 according to FIG. 1 as shown in FIGS. 3 and 4. .

In addition, as shown in FIG. 8, the convex portion 42 is formed to surround the inflection point 37, that is, the inflection point 37, whereby the convex portion 42 has an optical axis 12 of the LED 11 in plan view. It may be formed in a circular band shape surrounding the inflection point (37) existing in the form of a circle around the center.

Of course, although not shown in the drawings, the convex portions 42 may not be formed in a circular band shape, but may be formed in a plurality of states spaced apart at predetermined intervals in the circumferential direction of the inflection point 37 present in a planar circular form. .

However, as shown in FIG. 8, the convex portion 42 is formed in a circular band shape surrounding the inflection point 37, and the light is more evenly diffused than a plurality of convex portions are formed at predetermined intervals in the circumferential direction. It is preferable to make it possible.

9 is a vertical cross-sectional view showing the LED lens according to another embodiment of the present invention, Figure 10 is a schematic plan view of FIG.

9 and 10, the LED lens 40 according to the present exemplary embodiment may include the first convex portion 43 and the first convex portion 43 having a convex shape on the vertical cross section in the same manner as the convex portion 42 in addition to the convex portion 42. The convex portion 44 may further include.

The first convex portion 43 may be formed on the first exit surface 32 in a state spaced apart from the convex portion 42 toward the first exit surface 32 by a predetermined distance, and the second convex portion 44 may be It may be formed on the second exit surface 34 in a state spaced apart from the convex portion 42 toward the second exit surface 34.

As shown in FIG. 10, the first convex portion 43 and the second convex portion 44 have a circular band around the optical axis 12 of the LED 11 in a plane like the convex portion 42. It may be formed in a shape.

As such, when the first convex portion 43 and the second convex portion 44 are further formed in addition to the convex portion 42, as in the lens 10 of FIG. 1, a circular band is formed near the optical axis 12. It is possible to further improve the phenomenon that the dark portion (b) of the occurs.

In particular, when the first convex portion 43 and the second convex portion 44 are further formed in addition to the convex portion 42, the light reflected by the Fresnel from the exit surface 30 is reflected back from the bottom surface 13, thereby causing the LEDs. Since the light directed to the optical axis 12 can be further dispersed, the phenomenon in which the hot spot h is generated at the optical axis 12 portion as in the lens 10 according to FIG. 1 can be further improved.

In addition, the first convex portion 43 and the second convex portion 44 may be formed to be symmetrical with each other based on the convex portion 42 on the vertical section. Then, the phenomenon in which the dark portion b occurs near the optical axis 12 and the hot spot h in the optical axis 12 may be further improved.

FIG. 11 is a diagram illustrating a result of a light distribution distribution of light emitted through the lens of FIG. 9, and FIG. 12 is an enlarged view of a portion 'B' of FIG.

As shown in FIGS. 11 and 12, the light distribution of the lens 40 according to the present embodiment is closer to the optical axis 12 than in FIGS. 3 and 4 showing the light distribution of the lens 10 according to FIG. 1. It can be seen that the development of the dark portion (b) and the occurrence of the hot spot (h) in the optical axis 12 region in the.

That is, the dark portion b of a circular band is generated near the optical axis 12 on the screens of FIGS. 3 and 4. On the screens of FIGS. 11 and 12, the dark portion b is hardly distinguished from the surroundings. It can be confirmed that the improvement.

In particular, in the graphs of FIGS. 3 and 4, the shoulder shape is generated on both sides of the optical axis 12. In the graphs of FIGS. 11 and 12, the shoulder shape almost disappears. In the graph, the shoulder shape is generated. Since it means that the dark portion (b) is darker than the surroundings, the disappearance of the shoulder shape in the graphs of Figs. 11 and 12 indicates that the occurrence of the dark portion (b) is improved.

In addition, it can be seen that the brightness of the optical axis 12 portion on the screen of FIGS. 11 and 12 is less bright than the brightness of the optical axis 12 portion on the screens of FIGS. The hot spot (h) of the phenomenon is improved.

In particular, in the graphs of FIGS. 3 and 4, the point of the optical axis 12 was pointed upward, and it can be seen that the graph of FIGS. 11 and 12 changed to the flat shape, which is a hot spot (h) at the area of the optical axis 12. ), The phenomenon is improved.

As described above, the present invention, by forming a convex portion at the inflection point, the LED lens that can improve the phenomenon that the circular band-shaped dark portion near the LED optical axis, and the phenomenon that hot spots occur in the LED optical axis region As related to the present invention, the embodiments may be modified in various forms. Therefore, the present invention is not limited to the embodiments disclosed in the present specification, and all forms changeable by those skilled in the art to which the present invention pertains will belong to the scope of the present invention.

Claims

In the LED lens for evenly spreading the light from the LED,

And an entrance surface through which light emitted from the LED is incident into the lens, and an exit surface emitting light incident into the lens through the entrance surface to the outside of the lens.

The exit surface includes a first exit surface forming a convex curved shape on the LED side on a vertical cross section, and a second exit surface positioned around the first exit surface and forming a convex curved shape on the opposite side of the LED,

A convex portion having a convex shape upward in a vertical section is formed at an inflection point portion existing at the connection portion between the first exit surface and the second exit surface.

The convex portion of the LED lens, characterized in that formed in a circular band shape surrounding the inflection point existing in a circular shape around the optical axis of the LED on a plane.
The method of claim 1,

The emission surface has a first convex portion and a second convex portion having a convex shape upwardly in a vertical section, and having a planar circular band shape,

The first block portion is formed on the first exit surface in a state spaced apart a predetermined distance from the convex portion toward the first exit surface,

And the second convex portion is formed on the second emission surface in a state spaced apart from the convex portion toward the second emission surface by a predetermined distance.
The method of claim 2,

And the first convex portion and the second convex portion are symmetrical with respect to the convex portion on a vertical section.