WO2016099195A1 - Diffusion lens structure and light emitting device including same - Google Patents

Abstract

Disclosed is a diffusion lens structure. The diffusion lens structure for diffusing light emitted from a light emitting element, according to an embodiment of the present invention, which has a cross-section bilaterally symmetric with respect to the reference optical axis thereof, comprises: a first lens surface that faces the light emitting element and through which light emitted from the light emitting element is input; and a second lens surface through which the light input through the first lens surface is output, wherein when the angle that the input light, emitted from the light emitting element and input to the first lens surface, forms with the reference optical axis is defined as θ1, and the angle that the output light, output from the second lens surface after the entrance of the input light to the first lens surface, forms with the reference optical axis is defined as θ4, the first and second lens surfaces are formed to satisfy θ4 < θ1 for at least a part of the light that is emitted from the light emitting element and input to the first lens surface.

Description

Diffusion lens structure and light emitting device including the same

The present invention relates to a diffused lens structure and a light emitting device including the same, and more particularly, to a diffused lens structure and a light emitting device including the same to maximize the amount of light reaching the diffuser plate with a uniform brightness.

In the case of using a light emitting diode (LED) as a light source, it is possible to generate light with high efficiency by using a low current, thereby saving energy and protecting the environment because the LED does not contain harmful substances. Due to these advantages, a light emitting device using LED as a light source is widely used in various fields such as a backlight unit of lighting or television.

However, when the LED is used in a lighting or backlight unit as a point light source, it is difficult to obtain uniform light due to excessive glare or occurrence of hot spots. Therefore, in order to solve this problem, a method of making a surface light source using a diffusion plate after arranging a large number of LEDs at a narrow interval is used.

However, in this case, since a large number of LEDs must be used, the manufacturing cost of the product may be high. In addition, since the light emission angle or diffusion angle of the LED is about 120 degrees, some of the light emitted from the LED does not reach the diffusion plate disposed on the top of the LED, so that light loss may occur and the light emission efficiency may decrease. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and to provide a diffusion lens structure and a light emitting device including the same, which can reduce the light loss and increase the thickness of the device using the light source by increasing the diffusion angle of light. .

Another technical problem to be solved by the present invention is to provide a diffusion lens structure having a structure in which light can be uniformly dispersed in order to solve the non-uniformity of light due to hot spots and the like and a light emitting device including the same.

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

In order to solve the above-mentioned technical problems, the diffusion lens structure according to an embodiment of the present invention, a diffusion lens structure for diffusing the light emitted from the light emitting device, which is symmetrical with respect to the reference optical axis of the diffusion lens structure A diffusion lens structure having a cross section, comprising: a first lens surface on which light emitted from the light emitting element is incident to face the light emitting element; And a second lens surface which emits light incident through the first lens surface, wherein an angle at which incident light emitted from the light emitting element and incident on the first lens surface forms the reference optical axis is defined as θ 1, When the incident light is incident on the first lens surface and then exits from the second lens surface to be the outgoing light, when the angle of the outgoing light with the reference optical axis is defined as θ4, the first and second lenses The surface is formed to satisfy θ4 <θ1 with respect to at least some of the light emitted from the light emitting element and incident on the first lens surface.

According to the present invention as described above, the light loss can be reduced by increasing the diffusion angle of the light, and the light emitting device using the light source can be thinned because the light emitting device and the diffusion plate can be disposed closer.

Further, according to the present invention, the light emitting device can be induced to generate light having a uniform brightness because it has a configuration in which light can be dispersed by being located in a region where light is concentrated, such as a hot spot.

1 and 2 are cross-sectional views of the diffusion lens structure according to the first embodiment of the present invention.

3 is a cross-sectional view of a diffusion lens structure according to a second exemplary embodiment of the present invention.

4 is a cross-sectional view of a diffusion lens structure according to a third exemplary embodiment of the present invention.

5 is a cross-sectional view of a diffusion lens structure according to a fourth exemplary embodiment of the present invention.

6 is a cross-sectional view of a diffusion lens structure according to a fifth exemplary embodiment of the present invention.

7 is a cross-sectional view of a diffusion lens structure according to a sixth embodiment of the present invention.

8 is a cross-sectional view of a diffusion lens structure according to a seventh embodiment of the present invention.

9 is a cross-sectional view of a diffusing lens structure according to an eighth embodiment of the present invention.

10 is a cross-sectional view of a diffusion lens structure according to a ninth embodiment of the present invention.

11 is a view for explaining the effect of the diffusion lens structure according to the embodiments of the present invention.

12 is a table showing a simulation result using the diffusion lens structure according to the embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and / or "comprising" does not exclude the presence or addition of one or more other components in addition to the mentioned components.

Hereinafter, a diffusion lens structure according to embodiments of the present invention will be described with reference to the drawings.

First, referring to FIGS. 1 and 2, a diffusion lens structure according to a first embodiment of the present invention will be described. 1 and 2, a cross-sectional view of a diffusion lens structure according to a first embodiment of the present invention is disclosed.

Referring to FIG. 1, since the diffusion lens structure 20 may be disposed to cover the periphery of the light emitting device 10, light emitted from the light emitting device 10 may be incident on the diffusion lens structure 20. . Accordingly, the diffusion lens structure 20 may be used to emit light emitted from the light emitting device 10 at a constant emission angle, where the light emitting device 10 may include an LED light source, but is not limited thereto. It doesn't work.

Specifically, the diffusion lens structure 20 includes first to fourth lens surfaces 21-24, for example, the diffusion lens structure 20 is surrounded by the first to fourth lens surfaces 21-24. Can be defined as a dimensional structure. However, not all components illustrated in FIG. 1 are essential, so that the diffusion lens structure 20 having more or less components may be formed.

Referring to FIG. 1, the diffusion lens structure 20 may have a cross section symmetrically with respect to the reference optical axis 30, and specifically, may have a cross section of the vertical direction symmetric with respect to the reference optical axis 30. have. Here, the direction of the reference optical axis 30 may be a vertical upward direction, that is, a vertical direction from the light emitting device 10, and the diffusion lens structure 20 may have a shape of rotational symmetry about the reference optical axis 30. However, the present invention is not limited thereto and may have a shape that is not rotationally symmetrical.

The diffusion lens structure 20 may include a concave accommodating part 25 that may accommodate the light emitting device 10. The concave accommodating part 25 may be a space formed by being concavely dug into the diffusion lens structure 20, and thus may have a concave shape. The concave accommodating portion 25 may be surrounded by the first lens surface 21 and the open surface. In addition, the concave portion may have a cross-section symmetrical with respect to the reference optical axis 30, and may have a shape of rotational symmetry around the reference optical axis 30, but is not limited thereto and may have a shape that is not rotationally symmetrical. It may be.

Since the light emitting device 10 may be accommodated in the recess 25 of the diffusion lens structure 20, the light emitted from the light emitting device 10 may have a first lens surface 21 surrounding the light emitting device 10. Can be entered. Incident light incident on the first lens surface 21 may pass through the diffusion lens structure 20 and exit to the outside of the diffusion lens structure 20 through the second lens surface 22.

Here, since the refractive index of the inside of the diffused lens structure 20 and the refractive index of the outside (eg, air) of the diffused lens structure 20 are different, when light is incident from the outside of the diffused lens structure 20 to the inside, When light exits from the inside of the diffusion lens structure 20 to the outside, the light is refracted according to Snell's law. Therefore, according to the diffusion lens structure 20 according to the first embodiment of the present invention, by using the characteristics according to the shape of the lens surface included in the diffusion lens structure 20, the light incident on the diffusion lens structure 20 By adjusting the advancing direction, when the incident light incident on the diffusion lens structure 20 exits from the diffusion lens structure 20, a predetermined condition may be satisfied.

Specifically, referring to FIGS. 1 and 2, an angle formed by the light incident from the light emitting device 10 and incident on the first lens surface 21 with the reference optical axis 30 is defined as θ 1, and the incident light is defined as first. In the case where the incident light is emitted from the second lens surface 22 after being incident on the lens surface 21 to be the outgoing light, when the angle formed by the outgoing light with the reference optical axis 30 is defined as θ4, the first to third lens surfaces Reference numerals 21, 22, and 23 may be formed to satisfy θ4 <θ1 with respect to at least some of the light emitted from the light emitting element 10 and incident on the first lens surface 21. In this regard, each lens surface will be described in detail below.

First, the first lens surface 21 may be a surface on which light emitted from the light emitting device 10 is incident to face the light emitting device 10. As described above, the light emitting device 10 may be located in the recess 25 of the diffusion lens structure 20, and the recess 25 is surrounded by the first lens surface 21, so that the first The lens surface 21 may face the light emitting element 10. Therefore, the light emitted from the light emitting element 10 may be incident on the first lens surface 21.

Referring to FIG. 1, the first lens surface 21 may include a first region 21a and a second region 21b that are continuously formed, and the first region 21a of the first lens surface 21. An inflection point may exist at the connection portion P1 of the second region 21b of the first lens surface 21. In the present specification, the point of inflection is not limited to a mathematical definition such as a point that changes from a convex state to a concave state or a point that changes from a concave state to a convex state, and a lens such as a point of change in curvature. If there is a change in the characteristics of the surface can be said to be an inflection point.

For example, referring to FIG. 1, the first region 21a may be a curved surface as an upper region, and the second region 21b may be an inclined surface as a lower region, but is not limited thereto. Specifically, the first region 21a may be an aspherical surface, and the second region 21b may be inclined by a predetermined angle with respect to the fourth lens surface 24 perpendicular to the reference optical axis 30 as a plane. θ3 may be defined as an angle formed by the extension line of the fourth lens surface 24 perpendicular to the reference optical axis 30 and the second region 21b.

In relation to the inclination of the second region 21b of the first lens surface 21, the second region 21b surrounds the lower end of the concave accommodating portion 25, and the lower end of the concave accommodating portion 25 is formed in a first manner. The second region 21b of the first lens surface 21 is inclined in a direction in which the width is wider than the upper end of the concave receiving portion 25 surrounded by the first region 21a of the lens surface 21. There may be.

As described above, since the first region 21a is curved and the second region 21b is flat, there is a change in characteristics on the first lens surface 21, so that the first region 21a and the second region 21b are used. An inflection point exists at the connecting portion P1 of.

According to the diffusion lens structure 20 according to the first embodiment of the present invention, a second region 21b of the first lens surface 21, which is an inclined surface, may be formed at the lower end of the concave receiving portion 25. Therefore, according to the related art, the light emitted from the light emitting element 10 and passing through the lower end of the concave accommodating portion 25 has a high probability of not reaching the diffuser plate positioned above the diffused lens structure 20. When the diffusion lens structure 20 according to the present exemplary embodiment is used, the light emitted from the light emitting element 10 and passing through the lower end of the concave accommodating portion 25 is the second region 21b of the first lens surface 21. Since the light is refracted toward the image while being incident on the diffusion lens structure 20 through), the probability of reaching the diffusion plate positioned on the diffusion lens structure 20 is increased.

Specifically, referring to FIG. 1, light emitted from the light emitting element 10 at an angle of θ1 with the reference optical axis 30 is formed on the first lens surface 21 through the lower end of the concave accommodating part 25. It can be seen that the image is refracted toward the image while being incident to the second region 21b, and after the refracted light passes through the diffusion lens structure 20, it is emitted from the second lens surface 22 and the reference optical axis 30 and? It can be seen that the angle is refracted.

According to this, it can be confirmed that θ4 <θ1 is satisfied as a result due to the second region 21b of the first lens surface 21. In addition, as the path of the light emitted from the light emitting device 10 is refracted through the diffusion lens structure 20 and the movement path is changed upward, the light incident through the lower portion of the diffusion lens structure 20 is diffused. We can see that we can reach.

Subsequently, the second lens surface 22 may emit light incident through the first lens surface 21, and may be a curved surface as a surface surrounding the periphery of the diffusion lens structure 20, for example, an aspherical surface. However, it is not limited thereto.

Meanwhile, the third lens surface 23 may be connected to the second lens surface 22, and the fourth lens surface 24 may connect the first lens surface 21 and the third lens surface 23. . In summary, the first lens surface 21 and the second lens surface 22 may be connected by the third lens surface 23 and the fourth lens surface 24, and the third lens surface 23 may be the second lens surface. The fourth lens surface 24 may be connected to the lens surface 22, and the fourth lens surface 24 may be connected to the first lens surface 21.

Specifically, the third lens surface 23 may be an inclined surface as a plane, but is not limited thereto. That is, the third lens surface 23 may be inclined by a predetermined angle with respect to the fourth lens surface 24 perpendicular to the reference optical axis 30 as a plane. Θ2 may be defined as an angle formed by the extension line of the fourth lens surface 24 perpendicular to the reference optical axis 30 and the third lens surface 23.

Referring to FIG. 2, the inclination of the third lens surface 23 may be formed to face the inclination of the second area 21b of the first lens surface 21. In addition, the third lens surface 23 may be formed to reflect light in a desired direction rather than refracting the light in a desired direction. In detail, since the third lens surface 23 is positioned at the bottom of the diffusion lens structure 20, the light to be emitted to the bottom of the diffusion lens structure 20 may be reflected to the upper portion of the diffusion lens structure 20.

Therefore, according to the related art, the light emitted through the lower end of the diffusion lens structure 20 has a high probability of not reaching the diffusion plate located on the diffusion lens structure 20, but according to the present embodiment, When the lens structure 20 is used, incident light incident from the first lens surface 21 is reflected by the third lens surface 23 to the upper portion of the diffusion lens structure 20 and then the second lens surface 22 is closed. Since it is emitted through, the probability of reaching the diffusion plate located on the upper portion of the diffusion lens structure 20 is increased.

Specifically, referring to FIG. 2, after the light emitted from the light emitting element 10 forms an angle of 1 with the reference optical axis 30, the light is incident on the diffusion lens structure 20 through the first lens surface 21. It can be seen that the third lens surface 23 is reflected to the upper portion of the diffusion lens structure 20, and after the refracted light passes through the diffusion lens structure 20, while exiting from the second lens surface 22 It can be seen that the light is refracted to form an angle of θ4 with the optical axis 30.

According to this, it can be confirmed that θ4 <θ1 is satisfied as a result due to the third lens surface 23. In addition, as the path of the light emitted from the light emitting device 10 is refracted through the diffusion lens structure 20 and the movement path is changed upward, the light incident through the lower portion of the diffusion lens structure 20 is diffused. We can see that we can reach.

Meanwhile, in some embodiments, the third lens surface 23 may be formed to satisfy θ2> θ3. When θ2 <θ3, since the light refracted through the second area 21b of the first lens surface 21 may not reach the third lens surface 23, the third lens surface 23 may be removed. It may not be easy to control the path of light through.

The fourth lens surface 24 may be a base surface, and the fourth lens surface 24 may be a horizontal plane perpendicular to the reference optical axis 30, but is not limited thereto. In addition, in some embodiments, a reflective pattern may be formed on the fourth lens surface 24 to reflect light, but is not limited thereto.

As described above, it is confirmed that the diffusion angle of the diffusion lens structure 20 is increased by changing the exit angle of the light incident through the lower portion of the diffusion lens structure 20 through the first to third lens surfaces 23. Can be. For example, the diffusion angle may be 150 degrees or more, but is not limited thereto.

Referring to FIG. 3, a structure of a diffusion lens according to a second embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 3, a cross-sectional view of a diffusion lens structure according to a second embodiment of the present invention is disclosed.

Referring to FIG. 3, a reflective pattern may be formed on the third lens surface 23 of the diffusion lens structure 30 according to the second embodiment of the present invention. The reflection pattern is for reflecting light incident on the third lens surface 23. The reflection pattern may include the groove 23a or the protrusion 23b, but the shape of the reflection pattern may be unlimited. According to the formation of the reflective pattern, the surface roughness of the third lens surface 23 may be Ra 7um or more, but is not limited thereto.

However, the reflective patterns need not be formed in all regions of the third lens surface 23, and the reflective patterns may be formed only in some regions.

4, the structure of the diffusion lens according to the third embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 4, a cross-sectional view of a diffusion lens structure according to a third embodiment of the present invention is disclosed.

Referring to FIG. 4, in the diffusion lens structure 20 according to the third exemplary embodiment, a diffusion pattern may be formed on at least a portion of the second lens surface 22. For example, the diffusion pattern may be formed in an area adjacent to the third lens surface 23, but is not limited thereto.

The diffusion pattern may allow the light emitted through the second lens surface 22 to be efficiently reflected or refracted upward. The diffusion pattern may be, for example, the groove 26 or the projection 27, but is not limited thereto, and the vertical cross section of the diffusion pattern may be, for example, triangular or elliptical, but is not limited thereto. That is, the cross section in the vertical direction of the diffusion pattern is not limited to that shown in FIG.

Specifically, referring to FIG. 4, it can be seen that the light emitted to the second lens surface 22 is reflected or refracted by the diffusion pattern to move to the image side. According to this, it can be confirmed that θ4 <θ1 is satisfied as a result, due to the diffusion pattern of the second lens surface 22. In addition, as the path of the light emitted from the light emitting device 10 is refracted through the diffusion lens structure 20 and the movement path is changed upward, the light incident through the lower portion of the diffusion lens structure 20 is diffused. We can see that we can reach.

5, a structure of a diffusion lens according to a fourth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 5, a cross-sectional view of a diffusion lens structure according to a fourth embodiment of the present invention is disclosed.

Referring to FIG. 5, according to the diffusion lens structure 20 according to the fourth embodiment of the present invention, the first lens surface 21 may be a curved surface without an inflection point, and may be, for example, an aspherical surface, but is not limited thereto. .

Referring to FIG. 6, a structure of a diffusion lens according to a fifth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 6, a cross-sectional view of a diffusion lens structure according to a fifth embodiment of the present invention is disclosed.

Referring to FIG. 6, in the diffused lens structure 20 according to the fifth exemplary embodiment, the second lens surface 22 and the fourth lens surface 24 may be directly connected without the third lens surface 23. Can be.

7, the structure of the diffusion lens according to the sixth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the third embodiment of the present invention will be mainly described. Referring to FIG. 7, a cross-sectional view of a diffusion lens structure according to a sixth embodiment of the present invention is disclosed.

Referring to FIG. 7, in the diffusing lens structure 20 according to the sixth embodiment of the present invention, the first lens surface 21 may be a curved surface without an inflection point, but may be, for example, an aspherical surface, but is not limited thereto. In addition, the second lens surface 22 and the fourth lens surface 24 may be directly connected without the third lens surface 23.

Referring to Fig. 8, a structure of a diffusion lens according to the seventh embodiment of the present invention will be described. However, the differences from the diffusion lens according to the third embodiment of the present invention will be mainly described. Referring to FIG. 8, a cross-sectional view of a diffusion lens structure according to a seventh embodiment of the present invention is disclosed.

Referring to FIG. 8, in the diffused lens structure 20 according to the seventh exemplary embodiment, the first lens surface 21 may be a curved surface without an inflection point, but may be, for example, an aspherical surface, but is not limited thereto.

9, the structure of the diffusion lens according to the eighth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the third embodiment of the present invention will be mainly described. 9, a cross-sectional view of a diffusion lens structure according to an eighth embodiment of the present invention is disclosed.

Referring to FIG. 9, in the diffused lens structure 20 according to the eighth exemplary embodiment, the second lens surface 22 and the fourth lens surface 24 may be directly connected without the third lens surface 23. Can

10, a structure of a diffusion lens according to a ninth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 10, a cross-sectional view of a diffusion lens structure according to a ninth embodiment of the present invention is disclosed.

Referring to FIG. 10, in the diffusing lens structure 20 according to the ninth embodiment of the present invention, the first lens surface 21 may further include a third region 21c. Since the third area 21c may be located above the first area 21a, the first area 21a may be located between the second area 21b and the third area 21c.

Here, since the third region 21c may be a planar surface, for example, an inclined surface, and the first region 21a is a curved surface, there is a change in characteristics on the first lens surface 21, so that the first region 21a may be different from the first region 21a. An inflection point exists in the connection portion P2 of the third region 21c.

In addition, the third region 21c may be positioned at the top of the concave accommodating portion 25 and overlap with the reference optical axis 30. That is, the third region 21c may be formed at a position where incident light of which θ1 is 5 degrees or less can be incident. Since the third region 21c may be an inclined surface, the incident light may be refracted away from the reference optical axis 30.

Accordingly, since the diffusion lens structure 20 according to the ninth embodiment of the present invention further includes a third region 21c, excessive glare or hot spots generated by light adjacent to the reference optical axis 30 are generated. Can be prevented.

As described above, the diffusion lens structure 20 according to the exemplary embodiments of the present invention has been described with reference to FIGS. 1 to 10. The light emitting device may be configured using the diffusion lens structure 20 according to the exemplary embodiments of the present invention. For example, the light emitting device includes a light emitting device 10 and a diffusion for diffusing light emitted from the light emitting device 10. The lens structure 20 may be included. Here, the light emitting device 10 may be located in the recess 25 of the diffusion lens structure 20, for example, to control the height of the light emitted from the light emitting device 10, The upper height may be configured to be the same as or higher than the lower end of the recess 25, but is not limited thereto.

Hereinafter, the effect of the diffusion lens structure according to the embodiments of the present invention will be described with reference to FIG. 11. Referring to FIG. 11, a diagram for describing the effect of a diffusion lens structure according to embodiments of the present invention is disclosed.

FIG. 11A illustrates a diffusion lens structure 20 ′ according to the related art, and FIG. 11B illustrates a diffusion lens structure 20 according to embodiments of the present invention. According to this, the diffusion angle θa shown in FIG. 11A is narrower than the diffusion angle θb shown in FIG. 11B. Therefore, if the diffusion lens structure 20 'according to the prior art is used, in order to form a surface light source having a constant area due to the narrow diffusion angle θa, a larger number of light emitting elements 10 are required and the diffusion plate ( Since the distance 40) should be as far as possible, the size of the light emitting device can be increased due to the height ha of the light emitting device.

In contrast, according to the exemplary embodiment of the present invention, the number of light emitting devices 10 required to form a surface light source having a constant area can be reduced due to the wide diffusion angle θb, and the diffusion plate 40 can be disposed close to each other. Since the height hb of the light emitting device can be reduced, the size of the light emitting device can also be reduced.

Hereinafter, a simulation result using the diffusion lens structure according to the exemplary embodiments of the present invention will be described with reference to FIG. 12. Referring to FIG. 12, a table showing simulation results using a diffusion lens structure according to example embodiments is disclosed.

Referring to FIG. 12, the diffusion angle according to the diffusion lens structure may be derived by checking between the peaks of the graph. For example, on the graph, since the peak is formed on about 10 degrees and about 170 degrees, the diffusion angle according to the diffusing lens structure according to the embodiment of the present invention can be formed larger than 150 degrees.

On the other hand, the magnitude of the luminance between both peaks on the graph can be controlled by adjusting the magnitude of θ2 or θ3 in the diffusion lens structure according to the embodiment of the present invention. Therefore, by using the diffusion lens structure according to the embodiment of the present invention, it is possible to control the intensity of the luminance for the desired portion.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims (10)

A diffuser lens structure for diffusing light emitted from a light emitting device, wherein the diffuser lens structure has a symmetrical cross section with respect to a reference optical axis of the diffuser lens structure. A first lens surface facing the light emitting element to which light emitted from the light emitting element is incident; And A second lens surface for emitting light incident through the first lens surface Including, The angle at which incident light emitted from the light emitting element and incident on the first lens surface forms the reference optical axis is defined as θ1.After the incident light is incident on the first lens surface, the incident light is emitted from the second lens surface to emit light. In this case, when the angle formed by the emitted light with the reference optical axis is defined as θ4, the first and second lens surfaces are exposed to at least some of the light emitted from the light emitting element and incident on the first lens surface. The diffuse lens structure is formed to satisfy the θ4 <θ1 with respect to. The method of claim 1, The first lens surface includes a first region and a second region formed successively, and an inflection point exists at a connection portion between the first region of the first lens surface and the second region of the first lens surface Phosphorus, diffused lens structure. The method of claim 2, Wherein said first region is an upper region as a curved surface and said second region is a lower region as an inclined surface. The method of claim 3, The first lens surface further includes a third region that is an inclined surface, And the first region is located between the second region and the third region. The method of claim 1, A diffusion pattern is formed on at least a portion of the second lens surface, The diffusion pattern is a groove or a projection, the diffusion lens structure. The method of claim 5, The vertical cross section of the diffusion pattern is triangular or elliptical, the diffusion lens structure. The method of claim 1, A third lens surface connected with the second lens surface, wherein the second lens surface is a curved surface and the third lens surface is an inclined surface; A fourth lens surface which is a base surface connecting the first lens surface and the third lens surface; To further comprise, the diffusion lens structure. The method of claim 7, wherein A reflection pattern for reflecting light is formed on the third lens surface, and the reflection pattern is a groove or a protrusion. The method of claim 7, wherein The fourth lens surface is a horizontal surface perpendicular to the reference optical axis, When the angle formed by the extension line of the fourth lens surface and the third lens surface is defined as θ2, the third lens surface is formed to satisfy θ2> θ3. Light emitting element; And A diffuser lens structure according to any one of claims 1 to 9, wherein the diffuser lens structure diffuses light emitted from the light emitting element. Light emitting device comprising a.

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