KR20130107849A - Light diffusing lens and light emitting unint comprising the same - Google Patents

Light diffusing lens and light emitting unint comprising the same Download PDF

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Publication number
KR20130107849A
KR20130107849A KR1020120029974A KR20120029974A KR20130107849A KR 20130107849 A KR20130107849 A KR 20130107849A KR 1020120029974 A KR1020120029974 A KR 1020120029974A KR 20120029974 A KR20120029974 A KR 20120029974A KR 20130107849 A KR20130107849 A KR 20130107849A
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KR
South Korea
Prior art keywords
light
optical axis
diffusing lens
light incident
incident portion
Prior art date
Application number
KR1020120029974A
Other languages
Korean (ko)
Inventor
김은주
Original Assignee
서울반도체 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 서울반도체 주식회사 filed Critical 서울반도체 주식회사
Priority to KR1020120029974A priority Critical patent/KR20130107849A/en
Priority to PCT/KR2013/002402 priority patent/WO2013141649A1/en
Publication of KR20130107849A publication Critical patent/KR20130107849A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/52—Encapsulations
    • H01L33/54—Encapsulations having a particular shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
    • H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package

Abstract

The light emitting unit is disclosed. The light emitting unit has an optical axis (L), and includes a light diffusion lens made of a resin or glass material that borders the air on each of the light incidence portion and the light emission surface of the lower surface, and an LED emitting light toward the light incidence portion. The upper center of the light exiting surface is formed into a flat surface or a convex curved surface, and the light incident portion is located at a vertex of the light incident portion from a point p on the optical axis L within a range of 50 degrees from the optical axis L. The shortest distance to reach is formed in a structure larger than the shortest distance a to reach the side surface of the light incident part from the one point p.

Description

LIGHT DIFFUSING LENS AND LIGHT EMITTING UNINT COMPRISING THE SAME}

The present invention relates to a light diffusing lens applied to diffuse light of an LED, and more particularly, to a light diffusing lens for effectively and uniformly diffusing light of an LED to obtain a uniform light distribution.

BACKGROUND ART A direct backlighting unit for arranging a plurality of LEDs at regular intervals under a substantially flat object such as a liquid crystal panel or a light diffuser plate to illuminate the object is used for a backlight of a surface light or a liquid crystal display. In order to uniformly illuminate an object with only a plurality of LEDs, a large number of LEDs must be arranged densely, thus increasing power consumption. Furthermore, if there is a quality deviation between the LEDs, the object is unevenly backlighted. In order to reduce the number of LEDs used, a technique of distributing light widely by disposing a light diffusing lens on each LED may be used. In this technique, the light diffusing lens and the corresponding at least one LED constitute one light emitting unit.

In order for the light passing through the light diffusing lens to have a uniform distribution, it is required to effectively diffuse light within 60 degrees from the central axis of the light diffusing lens, that is, the optical axis. The conventional light diffusing lens includes a light incident portion formed concave on the bottom surface and a light exit surface opposite the bottom surface. In addition, the light diffusing lens has a concave portion at the upper end of the light exit surface in order to effectively diffuse light within 60 degrees from the optical axis. The recess contributes much to diffusing light near the optical axis, especially light within 60 degrees from the optical axis.

However, in designing a conventional light diffusing lens, there must be a deep and careful consideration of the shape and size of the concave portion, and the relationship between the concave portion and the light incident portion must also be deeply considered, which complicates the lens design and reduces the design freedom. Drop. In addition, defects or defects in the recesses during the manufacture or management of the light diffusing lens deteriorate the performance of the light diffusing lens and the product including the same.

Accordingly, an object of the present invention is to provide a light diffusing lens for LEDs that can diffuse the light of an LED effectively and widely without omitting a recess in the upper center of the light emitting surface.

The light emitting unit according to the aspect of the present invention has an optical axis (L), the light diffusing lens of the refractive index material higher than the air in the light incident portion and the light exit surface of each of the lower surface and the light incident toward the light incident portion Includes an LED that emits. The upper center of the light exiting surface is formed into a flat surface or a convex curved surface, and the light incident portion is located at a vertex of the light incident portion from a point p on the optical axis L within a range of 50 degrees from the optical axis L. The shortest distance to reach is formed in a structure larger than the shortest distance a to reach the side surface of the light incident part from the one point p.

According to one embodiment, the light incident portion has a vertical cross section.

According to one embodiment, the light incident portion, the lower inlet adjacent to the LED is circular, and has a shape that gradually converges while maintaining the circular toward the vertex.

According to one embodiment, the height of the light incident portion may be greater than 1.5 times the bottom inlet radius.

According to another aspect of the present invention, there is provided a light diffusing lens having an optical axis (L) but of a refractive index material higher than that of air, the light diffusing lens being formed on a lower surface and bordering the air, and opposite the lower surface. And an exit surface bounded by air. The upper center of the light exiting surface is formed into a flat surface or a convex curved surface, and the light incident portion is located at a vertex of the light incident portion from a point p on the optical axis L within a range of 50 degrees from the optical axis L. The shortest distance to reach is formed in a structure larger than the shortest distance a to reach the side surface of the light incident part from the one point p.

The light diffusing lens according to the present invention provides an evenly diffused light distribution by spreading light within 60 degrees from the optical axis effectively and broadly when the light incident portion is applied adjacent to the LED, even without a recess in the upper center of the light exit surface. can do. At this time, the omission of the concave portion makes it possible to design and manufacture the light diffusing lens more easily, and also to minimize the defect of the light diffusing lens due to the defects formed on the concave portion.

1 is a cross-sectional view showing a light emitting unit according to an embodiment of the present invention.
2 (a), 2 (b) and 2 (c) are views taken along lines aa, bb and cc of FIG. 1;
Figure 3 is a perspective view showing the LED of the light emitting unit shown in FIG.
4 is a view for explaining the light diffusing lens of the light emitting unit shown in FIG. 1 in more detail.
5 is a view showing a light directing angle distribution when using the light diffusing lens shown in FIG.
6 is a view for explaining a light diffusing lens according to another embodiment of the present invention.
FIG. 7 is a view showing a light directing angle distribution obtained by using the light diffusing lens of FIG. 6. FIG.
8A and 8B show a light diffusing lens and a direction angle distribution curve according to Comparative Example 1, respectively.
9A and 9B show light diffusing lens and directivity angle distribution curves according to Comparative Example 2, respectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like numbers refer to like elements throughout.

1 is a cross-sectional view showing a light emitting unit according to an embodiment of the present invention, Figure 2 (a), (b) and (c) is a view taken along the line aa, bb and cc of Figure 1 . At this time, the a-a line is a line on the lower surface of the light diffusing lens, the c-c line is a line on the upper surface of the light diffusing lens, and the b-b line is a cutting line in the middle of the height of the diffusion lens between the a-a line and the c-c line. 3 is a perspective view illustrating the LED of the light emitting unit shown in FIG. 1, FIG. 4 is a view for explaining the light diffusing lens of the light emitting unit shown in FIG. 1 in more detail, and FIG. 5 is shown in FIG. 4. It is a figure which shows the light directing angle distribution when using the shown light diffusing lens.

Referring to FIG. 1, the light emitting unit includes an LED 20 positioned on the printed circuit board 10 and a light diffusion lens 30 made of resin or glass material disposed on the LED 20. Although the printed circuit board 10 is partially illustrated to show one light emitting unit, the printed circuit board 10 may include a plurality of light emitting units regularly arranged on one printed circuit board 10.

The printed circuit board 10 includes conductive land patterns on which upper terminals of the LEDs 20 are bonded. In addition, the printed circuit board 10 may include a reflective film on an upper surface thereof. The printed circuit board 10 may be a metal-core PCB (MCPCB) based on a metal having good thermal conductivity, or may be based on an insulating substrate material such as FR4. Although not shown, a heat sink may be disposed below the printed circuit board 10 to dissipate heat generated by the LED 20.

As shown in FIG. 3, the LED 20 has a wavelength conversion covering the housing 21, the light emitting diode chip 23 mounted on the housing 21, and the light emitting diode chip 23. Layer 25 may be included. The LED 20 may also include lead terminals (not shown) supported by the housing 21. Alternatively, the LED may include a light emitting diode chip mounted directly on the printed circuit board and a light-transmissive encapsulant protecting the light emitting diode chip. The housing 21 may have a cavity 21a for mounting the light emitting diode chip 23, and the cavity 21a defines a light emission area of the LED 20. The wavelength conversion layer 25 covers the light emitting diode chip 23. In one embodiment, the wavelength conversion layer 25 may be formed by mounting the light emitting diode chip 23 and then filling the cavity 21a with a molding resin containing a phosphor. In this case, the wavelength conversion layer 25 may fill the cavity 21a of the housing 21 and the upper surface may be substantially flat or convex. In addition, a molding resin having a lens shape may be further formed on the wavelength conversion layer 25. In another embodiment, a light emitting diode chip 23 having a conformal phosphor coating layer may be mounted on the housing 21. That is, the conformal coating layer of the phosphor may be applied onto the light emitting diode chip 23, and the light emitting diode chip 23 having the phosphor coating layer may be mounted on the housing 21. The light emitting diode chip 23 having the conformal coating layer may be molded by a transparent resin. Furthermore, this molding resin can have a lens shape and thus can function as a primary lens. The wavelength conversion layer 25 converts light emitted from the light emitting diode chip 23 to implement mixed color light, for example, white light. The LED 20 is designed to have a light directivity distribution of a mirror symmetrical structure, and in particular, may be designed to have a light directivity distribution of a rotationally symmetrical structure. At this time, the axis of the LED toward the center of the light directing distribution is defined as the optical axis (L). That is, the LED 20 is designed to have a light directivity distribution that is symmetrical about the optical axis L. FIG. Although the light emitting device 20 including the light emitting diode chip 23 and the housing 21 has been described as being mounted on the printed circuit board 10, the light emitting diode chip 23 is a direct printed circuit board ( An LED having a structure mounted on the substrate 20 and having the wavelength conversion layer 25 covering the light emitting diode chip 23 on the printed circuit board 10 may also be considered. The optical axis L coincides with the central axis of the light diffusion lens 30.

Referring back to FIG. 1, the light diffusing lens 30 may include a lower surface 31 and a light emitting surface 35 opposite thereto, and may also include a leg 39. The lower surface 31 includes a concave light incident portion 31a. The light exit surface 35 is formed of a curved surface that is generally convex toward the top, and includes a flat surface 35a at the upper center. The flat surface 35a is located at a position corresponding to the recess of the conventional light diffusing lens, and the light diffusing lens 30 of the present embodiment is concave at the upper center of the light exiting surface by the light receiving part 31a structure described in detail below. Without light, the light around the optical axis can be widely spread. The light incident portion 31a has a substantially vertical cross section and has a shape that gradually converges toward the apex at the upper end from the lower inlet adjacent to the LED 20.

Referring to FIG. 2A, the lower surface 31 of the light diffusion lens 30 has a circular shape. In addition, a lower portion of the light incident portion 31a is positioned at the center of the lower surface 31, and a lower portion of the light incident portion 31a is circular. The light-receiving portion 31a maintains a circular shape from the bottom inlet to just before the top apex, but its diameter gradually decreases from the bottom to the top. Referring to FIG. 2C, the upper flat surface 35a of the light diffusing lens 30 also has a circular shape.

Referring to FIGS. 2A, 2B and 2C, the light diffusion lens 30 has a lower surface 31 having a circular shape and gradually decreases upward. The change in diameter of the outer circular shape may be greater in the upper side of the lens 30 than in the change in the outer circular shape diameter in the lower side of the light diffusion lens 30. The circular shape diameter of the light incident portion 31a gradually decreases.

Referring to FIG. 4, the optical axis L, which is the central axis of the light diffusion lens 30, is visible. In order to obtain a uniform light distribution using the light diffusing lens 30, a light intensity peak should exist at an angle of 60 degrees or more from the optical axis L, and in order to obtain such optical characteristics, It is important to spread the light within a degree effectively. 4 shows a reference line r which forms 50 degrees with respect to the optical axis L. FIG.

In order to effectively spread light within 50 degrees from the optical axis L, in the angular range between the optical axis L and the reference line r, that is, within 50 degrees from the optical axis L, the optical axis L The shortest distance 'b' from any one point p of the image to the apex of the light incident portion 31a is greater than the shortest distance 'a' from the same point p to the side of the light incident portion 31a. As described above, when b> a, the light incident part 31a may contribute to spreading light traveling in a range within 50 degrees from the optical axis L to an angle of 60 degrees or more from the optical axis L. On the other hand, when b <a, for the light traveling in the range within 50 degrees from the optical axis L, the light incident part 31a hardly contributes to spreading the light. For this reason, in the related art, a separate recess for spreading light in the center of the upper surface of the light exiting surface is required. In other words, the light diffusing lens 30 according to the present invention has been previously required by the curvature structure of the light incidence portion 31a that satisfies the condition of b> a within a range of 50 degrees from the optical axis L. The recessed portion can be omitted in the center.

At this time, the height of the light incident portion 31a is preferably larger than the radius R of the lower entrance of the light incident portion 31a. Furthermore, it is further preferred that the height H is greater than 1.5 times the radius R. In addition, the light incidence portion 31a forms a boundary with air having a lower refractive index than that of the resin or glass material, and the light exit surface also forms an boundary with air having a smaller refractive index than the resin or glass material.

FIG. 5 illustrates the light directivity angle distribution obtained by using the light diffusing lens of FIG. 4. Referring to FIG. 5, it can be seen that a light intensity peak is formed at a position approximately 72 degrees away from the optical axis L, and light is widely spread and distributed. From the result of FIG. 5, the light-diffusing lens 30 according to the present invention satisfies the condition that b> a in a range within 50 degrees from the optical axis L, without a recess in the upper center of the light exit surface. By the curvature structure of, it can be seen that light within 60 degrees from the optical axis L can be diffused effectively, and the light can be uniformly diffused and distributed.

6 is a view for explaining a light diffusing lens according to another embodiment of the present invention. As shown in FIG. 6, the light diffusing lens 30 of the present embodiment has the same curvature structure of the light incidence portion 31a as in the light diffusing lens of the previous embodiment shown in FIG. Therefore, the light incidence part 31a satisfies the condition that b> a in the range of 50 degrees from the optical axis L. FIG. However, unlike the light diffusing lens of the previous embodiment includes a flat surface flat in the upper center in the upper center of the light emitting surface, the light diffusing lens 30 of the present embodiment is provided with a curved surface 35b having a convex upper center of the light emitting surface.

FIG. 7 illustrates the light directing angle distribution obtained by using the light diffusing lens of FIG. 6. Referring to FIG. 7, it can be seen that a light intensity peak is formed at a position approximately 72 degrees away from the optical axis L, and light is widely spread and distributed. In addition, it is difficult to find a large difference when the light directivity angle distribution shown in FIG. 7 is compared with the light directivity angle distribution shown in FIG. 5. If the light incidence portion 31a satisfies the condition of b> a within a range of 50 degrees from the optical axis L, there is no significant difference in the light direction angle distribution whether the upper center of the light exit surface is formed as a flat surface or a convex surface. It can be seen.

(A) and (b) of FIG. 8 each show a light diffusing lens and a direction angle distribution curve according to Comparative Example 1. FIG.

The light diffusing lens shown in FIG. 8A has a range within 50 degrees from the optical axis, from the point where the shortest distance 'b' from any one point on the optical axis to the top of the light incident portion reaches the side of the light incident portion. At the same time as the shortest distance 'a' and provided with a recess in the upper center of the light-emitting surface. The light directivity angle distribution in this condition can be seen from (b) of FIG. 8, whereby it can be seen that the light directivity angle distribution is hardly different from the light directivity angle distribution of the previous embodiment. This means that the concave portion present at the center of the upper surface of the light exit surface has little function in changing the light direct angle distribution under the condition of b> a.

(A) and (b) of FIG. 9 each show a light diffusing lens and a direction angle distribution curve according to Comparative Example 2. FIG.

The light diffusing lens shown in Fig. 9A has a range within 50 degrees from the optical axis, from the point at which the shortest distance 'b' from any one point on the optical axis to the apex of the light incident portion reaches the side of the light incident portion. It is smaller than the shortest distance 'a' and provided with a recess in the upper center of the light exit surface. The light directivity angle distribution in this condition can be seen from (b) of FIG. 9, whereby it can be seen that the light directivity angle distribution is hardly different from the light directivity angle distribution of Comparative Example 1 and the above-described embodiments. . This shows that the concave portion at the center of the upper surface of the light emitting surface spread the light within 50 degrees from the optical axis under the condition of b <a.

Claims (8)

A light diffusing lens having an optical axis L and forming a boundary with air at each of the light incidence part and the light exit surface of the lower surface, but having a refractive index higher than that of the air; And
An LED emitting light toward the light incident part,
The upper center of the light emitting surface is formed of a flat surface or convex curved surface,
The light incident portion has a shortest distance from a point p on the optical axis L to a vertex of the light incident portion within a range of 50 degrees from the optical axis L, and the side surface of the light incident portion from the one point p. Light emitting unit, characterized in that formed in a structure larger than the shortest distance (a) to reach. The light emitting unit of claim 1, wherein the light incident portion has a vertical shape. The light emitting unit according to claim 1, wherein the light incidence part has a shape in which a lower end entrance adjacent to the LED has a circular shape and gradually converges while maintaining a circular shape toward the vertex. The light emitting unit of claim 3, wherein a height of the light incident part is greater than 1.5 times the lower entrance radius. A light diffusing lens having a refractive index higher than that of air and having an optical axis L,
A light incident part formed on the lower surface and bordering with air;
A light emitting surface bordering the air on the opposite side of the lower surface,
The upper center of the light emitting surface is formed of a flat surface or convex curved surface,
The light incident portion has a shortest distance from a point p on the optical axis L to a vertex of the light incident portion within a range of 50 degrees from the optical axis L, and the side surface of the light incident portion from the one point p. A light diffusing lens, characterized in that it is formed in a structure larger than the shortest distance (a) to. The light diffusing lens of claim 5, wherein the light incident portion has a vertical shape. The light diffusion lens according to claim 5, wherein the light incidence portion has a circular bottom entrance and gradually converges while maintaining a circular shape toward the apex. The light diffusing lens of claim 7, wherein a height of the light incident portion is greater than 1.5 times the lower entrance radius.
KR1020120029974A 2012-03-23 2012-03-23 Light diffusing lens and light emitting unint comprising the same KR20130107849A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020120029974A KR20130107849A (en) 2012-03-23 2012-03-23 Light diffusing lens and light emitting unint comprising the same
PCT/KR2013/002402 WO2013141649A1 (en) 2012-03-23 2013-03-22 Light emitting unit array and light diffusing lens suitable for the same

Applications Claiming Priority (1)

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KR1020120029974A KR20130107849A (en) 2012-03-23 2012-03-23 Light diffusing lens and light emitting unint comprising the same

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101442592B1 (en) * 2014-01-08 2014-09-22 (주)제이비엘 Light diffusing lens for led, and led module using the same
KR101463414B1 (en) * 2014-02-03 2014-11-20 (주)코이즈 Lighting emitting optical device
KR101690740B1 (en) 2016-01-05 2016-12-29 주식회사 에이치엘옵틱스 Asymmetric light diffusion lens
KR101697261B1 (en) 2015-11-13 2017-01-17 주식회사 에이치엘옵틱스 Lens for wide diffusion light
KR101875026B1 (en) * 2017-04-21 2018-07-06 주식회사 에이치엘옵틱스 Light distribution lens
KR20180118512A (en) 2018-02-07 2018-10-31 주식회사 에이치엘옵틱스 Light distribution lens
WO2019088457A1 (en) * 2017-10-31 2019-05-09 주식회사 에이치엘옵틱스 Optical lens

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101442592B1 (en) * 2014-01-08 2014-09-22 (주)제이비엘 Light diffusing lens for led, and led module using the same
KR101463414B1 (en) * 2014-02-03 2014-11-20 (주)코이즈 Lighting emitting optical device
KR101697261B1 (en) 2015-11-13 2017-01-17 주식회사 에이치엘옵틱스 Lens for wide diffusion light
KR101690740B1 (en) 2016-01-05 2016-12-29 주식회사 에이치엘옵틱스 Asymmetric light diffusion lens
KR101875026B1 (en) * 2017-04-21 2018-07-06 주식회사 에이치엘옵틱스 Light distribution lens
WO2019088457A1 (en) * 2017-10-31 2019-05-09 주식회사 에이치엘옵틱스 Optical lens
KR20180118512A (en) 2018-02-07 2018-10-31 주식회사 에이치엘옵틱스 Light distribution lens

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