Diffusing lens and luminaire including the same

Abstract

The present invention provides a diffusion lens and a lamp including the diffusion lens. The diffusion lens may include a plurality of diffusion parts that are in contact with an LED, are symmetrical to each other with respect to an optical axis that is a linear direction of light emitted from the LED, and have convex surfaces.

Description

Technical Field

[0001] The invention relates to a diffusion lens and a lamp comprising the diffusion lens. Background Art

[0002] Generally, a diffusion lens for LED is mainly used in a backlight unit such as a liquid crystal display device or a TV to expand the light straightness of the LED in a wide range of angles in all directions so that the light can be evenly distributed throughout the liquid crystal display panel. Therefore, the diffusion lens for LED is intended to achieve a lighting device that does not generate bright spots and dark areas by diffusing the light.

[0003] However, a lamp for a vehicle is generally composed of an LED and a diffusion lens, and the lamp for a vehicle is a lamp that optimizes the number and spacing of LEDs to provide a uniform linear image, and the diffusion lens in the lamp component for a vehicle focuses not only on expanding the LED light at a wide range of angles, but also on expanding the LED light horizontally to achieve straight-line lighting.

[0004] As a prior art of a diffusion lens, Patent Document 1 (Korean Patent Publication No. 10-2018-0001791) discloses Figure 1 As shown in the figure, in the vertical cross section on the LED, it has a shape convex upward from the light-emitting surface, and uses an LED lens composed of a first convex portion and a second convex portion having a circular band shape on a plane. In addition, Patent Document 1 has the following structure, in which the LED and the lens are composed of a 1:1 pair by fastening to the leg portion of the lower part. The problem of Patent Document 1 is that the degree of light spot and dark spot near the LED optical axis (such as Figure 2 In addition, Patent Document 1 has a separate fastening portion for fastening the plastic lens, and has an air gap formed in the LED portion.

[0005] As related technologies of diffusion lenses, such as Figure 3 and Figure 4 As shown in FIG. 1 , Patent Document 2 (Korean Patent Publication No. 10-2012-0104599) is a patent related to a modified lamp including a one-dimensional linear batwing lens for diffusing light. Figure 3 The linear bat-wing lens shown in the figure has a shape of a concave portion and a curved edge portion that are symmetrical on multiple LEDs. Figure 4As shown, the problem with the prior art is that a linear batwing lens is configured regardless of the number of LEDs, without optimizing the lens for the LEDs. For lamps for vehicles, it is important to reduce the number of LEDs and to achieve a uniform linear image by using a diffusion lens, but the problem with the prior art is that it does not focus on this. The light diffusion lens used in the vehicle lamp must be a lens that spreads light horizontally, but when the technology of Patent Document 2 is used, the spread of light is independent of the number and spacing of the LEDs, making the vehicle lamp uneven. In addition, the technology is composed of a plastic lens and requires a separate fastening portion, which causes an air gap and thus causes optical loss.

[0006] In addition, the related art has so far used a method of assembling a light diffusion lens having various shapes to diffuse the LED light in all liquid crystal display devices or linear lamps. Therefore, there are the following defects: not only the processing and manufacturing costs are increased, but also optical loss occurs due to the air gap between the LED and the lens.

[0007] The information contained in this background section of the present invention is only for enhancing understanding of the general background of the present invention and should not be regarded as an admission or any form of suggestion that the information constitutes prior art known to a person skilled in the art. Summary of the invention

[0008] Various aspects of the present invention are directed to providing a diffusion lens and a lamp including the same, which can reduce optical loss, can be adapted to a curved substrate, and can effectively diffuse light horizontally.

[0009] A diffusion lens according to various aspects of the present invention includes a plurality of diffusion parts that are in contact with an LED, are symmetrical to each other with respect to an optical axis that is a linear direction of light emitted from the LED, and have convex surfaces.

[0010] The convex surface of the diffuser is formed by two or more curved surfaces having different centers of curvature.

[0011] The convex surface of the diffusion portion includes a first curved surface and a second curved surface having different centers of curvature, and a third curved surface between the first curved surface and the second curved surface, and is formed to be sequentially connected in one direction from the optical axis in the order of the first curved surface, the third curved surface, and the second curved surface.

[0012] Here, the curvature of the third curved surface is greater than the curvature of the first curved surface and the curvature of the second curved surface.

[0013] In addition, the curvature of the first curved surface is smaller than the curvature of the second curved surface.

[0014] In addition, a curved surface is formed between the first curved surface and a first curved surface of another diffusion portion adjacent to the first curved surface and has a bending direction opposite to the first curved surface.

[0015] Here, the angle (θ1) between the highest points of the adjacent diffusion portions around the lowest point of the curved surface is 5° to 80°.

[0016] In addition, when the height from the LED to the lowest point of the curved surface is H1, and the height from the LED to the highest point of the diffusion portion is H2, H1:H2=1:1 to 1:2.

[0017] In addition, when the horizontal distance from the LED to the highest point of the diffusion portion is A, and the horizontal distance from the LED to the end of the second curved surface is C, A:C=1:1 to 1:4.

[0018] At the same time, the convex surface of the diffuser may include: a first curved surface and a second curved surface, the first curved surface and the second curved surface having different centers of curvature; a third curved surface between the first curved surface and the second curved surface; and a concave cut surface between the first curved surface and the third curved surface, having a bending direction opposite to the first curved surface and the third curved surface.

[0019] Here, the convex surface of the diffuser may have a plurality of concave cutout surfaces formed on the convex surface.

[0020] Thus, the plurality of concave cutout surfaces may be parallel to each other.

[0021] Alternatively, adjacent concave cutout surfaces among the plurality of concave cutout surfaces may be plane-symmetrical with each other.

[0022] In addition, a curved surface is formed between the first curved surface and a first curved surface of another diffusion portion adjacent to the first curved surface and has a curvature opposite to that of the first curved surface.

[0023] Here, the angle (θ1) between the highest points of the adjacent diffusion portions around the lowest point of the curved surface is 5° to 80°.

[0024] In addition, when the height from the LED to the lowest point of the curved surface is H1, and the height from the LED to the highest point of the diffusion portion is H2, H1:H2=1:1 to 1:2.

[0025] In addition, when the horizontal distance from the LED to the highest point of the diffusion portion is A, and the horizontal distance from the LED to the end of the second curved surface is C, A:C=1:1 to 1:4.

[0026] In addition, an angle (θ2) between the highest point of the diffusion portion and the highest point of the second curved surface around the lowest point of the concave cut surface is 7° to 80°.

[0027] In addition, when the height from the LED to the lowest point of the curved surface is H1, and the height from the LED to the lowest point of the concave cut surface is H3, H3 is equal to or greater than H1.

[0028] Next, a lamp according to various aspects of the present invention includes: a PCB substrate; an LED mounted to the PCB substrate; and a diffusion lens including a plurality of diffusion parts that contact the LED, are symmetrical to each other with respect to an optical axis that is a linear direction of light emitted from the LED, and have a convex surface.

[0029] Here, the material of the diffusion lens is liquid silicone resin (LSR).

[0030] Therefore, there is no air gap between the diffuser lens and the LED.

[0031] In addition, the diffusion lens is integrally formed on the PCB substrate by injection molding.

[0032] Since the diffusion lens according to the exemplary embodiment of the present invention can be injection-molded by liquid silicon material (LSR) by inserting a substrate on which an LED is mounted, an air gap between the LED and the lens can be eliminated and a separate adhesive is not required, thereby reducing optical loss.

[0033] In addition, since the diffusion lens can be integrally injection-molded, the diffusion lens can also be formed on a curved substrate, and even with a minimum of LEDs, light can be diffused horizontally and excellently, thereby performing a surface light emitting function as a vehicle lamp.

[0034] The method and apparatus of the present invention have other features and advantages, which will be apparent from the accompanying drawings and the accompanying drawings incorporated herein. Figure 1 These and other aspects will become apparent or be described in more detail in the following detailed description which illustrates certain principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 , Figure 2 , Figure 3 and Figure 4 is a diagram showing a diffusion lens according to the related art;

[0036] Figure 5 is a diagram showing a lamp according to an exemplary embodiment of the present invention;

[0037] Figure 6 is a diagram conceptually illustrating a diffusion lens according to an exemplary embodiment of the present invention;

[0038] Figure 7 are diagrams showing various exemplary embodiments of a diffusion lens according to an exemplary embodiment of the present invention;

[0039] Figure 8 are diagrams showing various exemplary embodiments of a diffusion lens according to an exemplary embodiment of the present invention;

[0040] Fig. 9 are diagrams showing various exemplary embodiments of a diffusion lens according to an exemplary embodiment of the present invention;

[0041] Fig.10 are diagrams showing planar shapes of various exemplary embodiments of a diffusion lens according to an exemplary embodiment of the present invention;

[0042] Fig.11 are diagrams showing side cross-sectional shapes of various exemplary embodiments of a diffusion lens according to an exemplary embodiment of the present invention;

[0043] Fig.12 is a diagram showing a diffusion lens according to a comparative example;

[0044] Fig.13 and Fig.14 is a diagram showing direction angles according to a comparative example and first to various exemplary embodiments of the present invention;

[0045] Fig.15A , Fig. 15B , Fig. 15C as well as Fig.15D are diagrams sequentially showing direction angles according to a comparative example and first to respective exemplary embodiments of the present invention;

[0046] Fig.16A , Fig. 16B , Fig. 16C as well as Fig.16D are diagrams sequentially showing simplified lamp images according to a comparative example and first to respective exemplary embodiments of the present invention;

[0047] Fig.17 FIG. 1 is a diagram schematically showing a diffuser lens according to an application example of the present invention.

[0048] It should be understood that the accompanying drawings are not necessarily drawn to scale, but rather present a slightly simplified representation of various features illustrating the basic principles of the invention. The specific design features of the present invention contained herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the specific designed application and use environment.

[0049] In the drawings, like reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0050] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments of the present invention, it should be understood that this specification is not intended to limit the present invention to those exemplary embodiments. Rather, the present invention is intended to cover not only the exemplary embodiments of the present invention, but also various alternatives, variations, equivalents and other embodiments that may be included within the spirit and scope of the present invention as determined by the appended claims.

[0051] For a fuller understanding of the invention, its operating advantages and objectives attained by practicing the invention, reference may be made to the accompanying drawings which illustrate exemplary embodiments of the invention and to the matters described therein.

[0052] In describing exemplary embodiments of the present invention, well-known technologies or repeated descriptions that may unnecessarily obscure the subject matter of the present invention will be briefly described or omitted.

[0053] Figure 5 A lamp according to an exemplary embodiment of the present invention is shown, and Figure 6 A diffusion lens according to an exemplary embodiment of the present invention is conceptually illustrated.

[0054] The lamp 10 according to the exemplary embodiment of the present invention includes a PCB substrate 11, an LED 12 mounted on the PCB substrate 11, and a diffusion lens 20 which is stacked and connected to the LED 12 and the PCB substrate 11 and diffuses light emitted from the LED 12.

[0055] The diffusion lens 20 according to an exemplary embodiment of the present invention is injected by using a liquid silicone material (LSR), by mixing a material including a main material and a curing agent in a ratio of 1:1 to 3:1. When a thermosetting lens that is quickly cured by a reaction between the main material and the curing agent is manufactured, even if a PCB mounted with an LED is placed in a mold to directly inject the thermosetting lens, the LED will not be greatly damaged. Therefore, since the LED and the silicon material are injected in close contact with each other, no air gap will occur and optical loss can be reduced, thereby increasing the amount of light. On the other hand, since the injection molding using conventional plastic materials uses thermoplastic resins, the LED may be exposed for a long time at high mold temperatures, thereby being damaged. In addition, since the conventional technology is described as a plastic lens and has a separate fastening portion, it is easy only to fasten to a flat substrate, and the present technology is also applicable to substrates with curvatures and flat plates because the lamp is formed by injection molding silicon.

[0056] In addition, if Figure 6As shown, by injection molding the diffusion lens 20 onto the PCB substrate 11 on which the LEDs 12 are mounted, not only can the diffusion lens 20 be injection molded onto each LED 12, but the diffusion lens 20 can also be constructed in an aspherical shape, thereby widely extending the linearity of the LED light and diffusing the light horizontally.

[0057] In addition, the conventional diffusion lens mainly has a structure in which a fastening part is separately manufactured to be fastened to the LED, and needs to be attached to the upper part of the chip with an adhesive, and uses a plastic material. However, the diffusion lens according to the exemplary embodiment of the present invention does not use a separate fastening part and may not have an air gap, thereby reducing optical loss and diffusing light horizontally, and can realize a surface light-emitting structure that can apply a curved surface, thereby being suitable for designing a curved surface of a vehicle lamp.

[0058] The diffusion lens according to the exemplary embodiment of the present invention is a lens with improved diffusion performance for use as a vehicle lamp. To this end, as described later, by implementing the diffusion lens in an aspherical shape, etc., the diffusion performance can be improved, and because the liquid silicone material is used for injection molding, such design freedom is made possible.

[0059] Figure 7 Various exemplary embodiments of a diffusion lens for a lamp according to an exemplary embodiment of the present invention are shown, Figure 8 Various exemplary embodiments thereof are shown, and Fig. 9 Various exemplary embodiments thereof are shown.

[0060] in addition, Fig.10 The planar shapes of various exemplary embodiments of the present invention are shown, and Fig.11 Side cross-sectional shapes of various exemplary embodiments are shown.

[0061] First, refer to Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 Various exemplary embodiments of the diffusion lens according to the exemplary embodiment of the present invention are described, and the various exemplary embodiments will be described, and the same configuration applicable to the various exemplary embodiments will be described in more detail through the various exemplary embodiments.

[0062] The diffusion lens according to the exemplary embodiment of the present invention includes: a plurality of bases and a plurality of diffusion parts, the plurality of bases are formed on the LED 12 and the PCB substrate 11 by injection molding and are in contact with the PCB substrate 11; the plurality of diffusion parts correspond to the upper part of the base and have convex surfaces symmetrical with respect to the optical axis (the linear direction of light emitted from the LED 12). The base is a configuration considering the height of the LED 12, but may be omitted.

[0063] First, according to Figure 7 The diffusion lens 100 according to various exemplary embodiments is formed to have a structure in which the base portion 130 contacting the PCB substrate 11 and the diffusion portions 110 and 120 having convex surfaces are symmetrical to each other with respect to the optical axis.

[0064] However, the convex surfaces of the diffusers 110 and 120 are not formed of a curved surface having a single curvature, but are formed of two or more curved surfaces having different centers of curvature, so that each diffuser has an asymmetric and aspherical shape.

[0065] That is, the convex surface of the diffusion portion may be formed by the first curved surface 111 , the second curved surface 112 , and the third curved surface 113 .

[0066] The first curved surface 111 is close to the optical axis, the second curved surface 112 is installed away from the optical axis, and the third curved surface 113 is formed between the first curved surface 111 and the second curved surface 112 .

[0067] The first curved surface 111 , the second curved surface 112 , and the third curved surface 113 may have different centers of curvature from each other, but the curvature directions are configured to be all the same.

[0068] In addition, the first curved surface 111, the third curved surface 113, and the second curved surface 112 are sequentially formed to be sequentially connected in one direction from the optical axis, and the third curved surface 113 may be ignored based on the curvature setting of the first curved surface 111 and the second curved surface 112. That is, the curvature of the third curved surface 113 may be the same as the curvature of the first curved surface 111 or the second curved surface 112, and the curvature of the second curved surface 112.

[0069] However, more preferably, the curvature of the third curved surface 113 is greater than the curvatures of the first curved surface 111 and the second curved surface 112 , and more preferably, the curvature of the first curved surface 111 is smaller than the curvature of the second curved surface 112 .

[0070] In addition, the first curved surface 111 is connected to the first curved surface of the adjacent diffuser through the curved surface 140, and the curved surface 140 has a bending direction opposite to that of the first curved surface 111. That is, the first curved surface 111 is convex, and the curved surface 140 has a concave curvature.

[0071] A more detailed geometric description of such a diffusion lens according to various exemplary embodiments is included in the geometric description of the diffusion lens according to various exemplary embodiments of the present invention which will be described later.

[0072] Next, according to Figure 8 , Fig.10 and Fig.11The diffusion lens 200 of various exemplary embodiments of the present invention shown is formed to have a structure in which the base portion 230 contacting the PCB substrate 11 and the diffusion portions 210 and 220 having convex surfaces are symmetrical to each other with respect to the optical axis.

[0073] However, the convex surfaces of the diffusion portions 210 and 220 are not formed of a curved surface having a single curvature, but are formed of two or more curved surfaces having different centers of curvature, so that each diffusion portion has an asymmetric and aspherical shape.

[0074] That is, the convex surface of the diffusion portion may be formed by the first curved surface 211 , the second curved surface 212 , and the third curved surface 213 .

[0075] Since properties of the first curved surface 211 , the second curved surface 212 , the third curved surface 213 , and the curved surface 240 are the same as those in the above-described various exemplary embodiments, description thereof will be omitted.

[0076] However, according to various exemplary embodiments, the concave cutout surface 214 is formed on the diffusion portion 210 of the diffusion lens 200 .

[0077] As shown in the figure, the concave cut surface 214 is formed between the first curved surface 211 and the third curved surface 213 and has a bending direction opposite to the first curved surface 211 and the third curved surface 213, thereby being concavely formed in a substantially V-shape on the side surface as shown in the figure.

[0078] The concave cut surface 214 may be a concave shape that is smoother than the V-shape, or a plurality of concave cut surfaces 214 may be formed. In this case, the curved surface 240 may also be regarded as one concave cut surface 214 .

[0079] In the present case, the plurality of concave cutout surfaces 214 may be sequentially formed by concave surfaces having the same shape as one another (ie, being in a parallel relationship to one another).

[0080] Alternatively, adjacent concave cutout surfaces 214 may be implemented by surfaces that are symmetrical to each other, and the concave cutout surfaces 214 may be implemented as a whole in an asymmetrical shape.

[0081] Next, we will refer to Fig.11 The geometric features of the diffusion lens according to various exemplary embodiments are described. Here, except for the items related to the concave cut surface, the geometric features are also applicable to the diffusion lens according to various exemplary embodiments, and the effect suitable for surface light emission described later can be exerted by such a geometric shape of the diffusion lens.

[0082] exist Fig.11In FIG. 2 , H1 refers to the height from the LED to the lowest point of the curved surface 240 , H2 refers to the height from the LED to the highest point of the convex surface, and H3 refers to the height from the LED to the lowest point of the concave cut surface 214 .

[0083] In addition, A refers to the horizontal distance from the LED to the highest point ( H2 ), B refers to the horizontal distance from the LED to the concave cutout surface ( H3 ), and C refers to the horizontal distance from the LED to the end of the second curved surface 212 .

[0084] Here, H2 is higher than H1 and may have a range of H1:H2=1:1 to 1:2.

[0085] In addition, H3 is higher than or equal to H1.

[0086] In addition, A:C has a ratio of 1:2 to 1:4 or less, and B:C has a ratio of about 1:2 or less.

[0087] The angle of the recess formed between the two diffusers (i.e., the angle (θ1) between the highest points of the two diffusers relative to the lowest point of the curved surface 240) is approximately 6° to 70°, and the angle of the concave cut surface 214 (i.e., the angle (θ2) between the highest point of the diffuser and the highest point of the second curved surface 212 relative to the lowest point of the concave cut surface 214) is approximately 7° to 80°.

[0088] As mentioned above, the concave portion and the V-cut end portion need to have an R value, and when Fig.10 When viewed from the top as shown in FIG. , an optical device is formed concavely in the vertical direction of the LED to transmit the vertically emitted LED light to the left 120° in the vertical direction and the right 120° in the vertical direction. Figure 8 When viewed from the side as shown in , a V-cut may be formed near the center of the convex surface, thereby diffusing the amount of light to the center portion.

[0089] Next, Fig. 9 A diffusion lens 300 according to various exemplary embodiments of the present invention is shown. Similar to the diffusion lens according to various exemplary embodiments, the diffusion lens 300 according to various exemplary embodiments includes a plurality of diffusion parts 310, 320, 330 having convex surfaces on concentric circles with respect to an optical axis.

[0090] However, unlike the aforementioned embodiment, each of the diffusers 310 , 320 , 330 has a single curvature, symmetrically includes four diffusers, and is partially omitted in the drawings.

[0091] Next, by simulating a diffusion lens according to various exemplary embodiments of the present invention, Fig.12Comparative Example 1 is shown which includes diffusion parts 410 and 420 having surfaces that are symmetrical and convex with respect to the optical axis.

[0092] in addition, Fig.13 and Fig.14 Directional angles according to the comparative example and the first to various exemplary embodiments of the present invention are shown.

[0093] Fig.15A , Fig. 15B , Fig. 15C and Fig.15D Direction angles according to the comparative example and the first to various exemplary embodiments of the present invention are sequentially shown, and Fig.16A , Fig. 16B , Fig. 16C and Fig.16D Simplified lamp images according to a comparative example and first to various exemplary embodiments of the present invention are sequentially shown.

[0094] Next, with reference to the following summary in Table 1, Comparative Example 1, various exemplary embodiments of the present invention, various exemplary embodiments of the present invention, and effects of the various exemplary embodiments will be described.

[0095] [Table 1]

[0096]

[0097] In the case of Comparative Example 1 where θ1 is equal to or greater than 90°, Fig.16A As shown in the simplified lamp image of , light is concentrated in the center and does not spread to the left and right. In addition, as can be confirmed in Table 1, the direction angle is 50°, which is a smaller angle than the existing LED direction angle (60°). This is a phenomenon that the light of the LED is concentrated in the center.

[0098] However, if FIG. 16B to FIG. 16D As shown, each of the first, second and various exemplary embodiments of the present invention in which θ1 is equal to or less than 90° demonstrates the light diffusion effect.

[0099] That is, the diffusion lens according to the exemplary embodiment of the present invention is superior to the lens of the related art in light diffusion performance and has no air gap, so that the optical loss due to the air gap is smaller, and as shown in Table 1, the maximum brightness is higher than the existing LED light amount.

[0100] Unlike Comparative Example 1 which has only one directional angle, it can be seen that the present invention has multiple directional angles and diffuses light at various angles. As can be confirmed in Table 1, various exemplary embodiments have three directional angles of 87, 66, and 57, which means that the light is diffused horizontally at a higher angle relative to Comparative Example 1. This enables the use of a small number of LEDs in a vehicle lamp component and enables a uniform linear image to be achieved.

[0101] When the angle (θ1) of the concave portion is 90° or more, the prior art has a smooth mountain shape, and as shown in Comparative Example 1, the ratio of A:C (the position of the highest point in the lens) is 1:3 or more, thereby preventing light from being diffused in the left and right directions thereof. Therefore, Comparative Example 1 cannot diffuse light widely at an angle of 120° of a circle (the shape of the prior art direction angle of the LED).

[0102] On the other hand, when the angle (θ1) of the concave portion is less than or equal to 90°, light is emitted in a concentrated light amount of about ±40°, and as shown in various exemplary embodiments, the ratio of A:C (the position of the highest point in the lens) is less than or equal to 1:3. Therefore, the lens according to various exemplary embodiments can reduce the amount of light of the vertical part of the LED and diffuse the light widely in the left and right directions thereof.

[0103] In addition, various exemplary embodiments have the following form: in the form of a concave cut surface formed at the highest point of various exemplary embodiments, the amount of light at the ±10, ±40 and ±80 positions of the direction angle is increased. Various exemplary embodiments diffuse light to the greatest extent at a horizontal angle and diffuse light more widely while expanding the existing circular direction angle of 120° to various angles more widely. This can improve the image by improving the uniformity of light in the vehicle lamp, and can also reduce the number of LEDs.

[0104] Finally, various exemplary embodiments diffuse the light in a cross pattern by forming convex portions concentrically and symmetrically at four locations instead of two. This also diffuses the light in the left-right direction by expanding the light at a wider directional angle than the existing directional angle. The vertical direction is difficult to see in the directional angle diagram.

[0105] In addition, unlike the prior art, the present invention can have a lens for each LED to diffuse the LED light with maximum brightness, thereby reducing the number of LEDs. In addition, through the silicon injection molding process, the diffusion lens is immediately injection molded without the need for fastening, and there is no air gap, so that there is almost no optical loss. At the same time, Fig.17As shown in , a thin adhesive layer 30 of 0.5 mm to 2.0 mm can be formed between the diffusion lens 20 and the PCB substrate 11 by injection molding, thereby improving the adhesion between the lens and the PCB substrate and being suitable for lamps with curvature.

[0106] In addition, the diffusion lens according to the exemplary embodiment of the present invention may include a silicon material to have excellent elasticity and strong adhesive force, thereby exerting excellent performance as a diffusion lens of a lamp having a curvature.

[0107] To facilitate interpretation and accurate definition of the appended claims, the terms "upper", "lower", "inner", "outer", "up", "lower", "upward", "downward", "front", "rear", "back", "inside", "outer side", "inward", "outward", "inner", "external", "inner", "outer", "forward", "rearward" are used to describe the features of the exemplary embodiments with reference to the positions of features shown in the figures. It will also be understood that the term "connect" or its derivatives refer to both direct and indirect connections.

[0108] For the purpose of illustration and description, the description of specific exemplary embodiments of the present invention has been presented above. They are not intended to be exhaustive or to limit the present invention to the precise embodiments disclosed, and it is apparent that several modifications and variations may be made in accordance with the above teachings. The exemplary embodiments selected and described are intended to explain certain principles of the present invention and their practical applications so that other persons skilled in the art can make and utilize various exemplary embodiments of the present invention, as well as substitutions and variations thereof. The scope of the present invention is intended to be limited by the appended claims and their equivalents.

Claims

1. A diffusion lens, comprising a plurality of diffusion parts, the plurality of diffusion parts being in contact with an LED, the plurality of diffusion parts being symmetrical with respect to a linear direction of light emitted from the LED, i.e., an optical axis, and each diffusion part having a convex surface, in, The convex surface of the diffusion portion is formed by two or more curved surfaces with different centers of curvature. Wherein, the convex surface of the diffusion portion includes: a first curved surface and a second curved surface, the first curved surface and the second curved surface having different centers of curvature, wherein the first curved surface is close to the optical axis and the second curved surface is far from the optical axis; a third curved surface between the first curved surface and the second curved surface; and The concave cut surface between the first curved surface and the third curved surface has a bending direction opposite to the first curved surface and the third curved surface.

2. The diffusion lens according to claim 1, in, The curvature of the third curved surface is greater than the curvature of the first curved surface and the curvature of the second curved surface.

3. The diffusion lens according to claim 1, in, The curvature of the first curved surface is smaller than the curvature of the second curved surface.

4. The diffusion lens according to claim 1, in, A curved surface is formed between a first curved surface of one of the plurality of diffusers and a first curved surface of another of the plurality of diffusers adjacent to the first curved surface of the one of the plurality of diffusers, and has a bending direction opposite to the first curved surface of the one of the plurality of diffusers.

5. The diffusion lens according to claim 4, in, An angle between a highest point of the one diffusion portion among the plurality of diffusion portions and a highest point of the other diffusion portion around a lowest point of the curved surface is 5° to 80°.

6. The diffusion lens according to claim 4, in, A ratio of a height from the LED to a lowest point of the curved surface to a height from the LED to a highest point of the plurality of diffusion portions is 1:1 to 1:

2.

7. The diffusion lens according to claim 4, in, A ratio of a horizontal distance from the LED to a highest point of the plurality of diffusion portions to a horizontal distance from the LED to an end of the second curved surface is 1:1 to 1:

4.

8. The diffusion lens according to claim 4, in, An angle between the highest points of the plurality of diffusion portions and the highest point of the second curved surface around the lowest point of the concave cutout surface is 7° to 80°.

9. The diffusion lens according to claim 4, in, The height from the LED to the lowest point of the concave cut surface is equal to or greater than the height from the LED to the lowest point of the curved surface.

10. A lamp, comprising: PCB substrate; LED, mounted on the PCB substrate; as well as a diffusion lens including a plurality of diffusion parts, the plurality of diffusion parts being in contact with the LED, the plurality of diffusion parts being symmetrical with respect to a linear direction of light emitted from the LED, that is, an optical axis, and each diffusion part having a convex surface, The convex surface of the diffusion portion is formed by two or more curved surfaces with different centers of curvature. Wherein, the convex surface of the diffusion portion includes: a first curved surface and a second curved surface, the first curved surface and the second curved surface having different centers of curvature, wherein the first curved surface is close to the optical axis and the second curved surface is far from the optical axis; a third curved surface between the first curved surface and the second curved surface; and The concave cut surface between the first curved surface and the third curved surface has a bending direction opposite to the first curved surface and the third curved surface.

11. The lamp according to claim 10, in, The material of the diffusion lens is liquid silicone material LSR.

12. The lamp according to claim 11, in, There is no air gap between the diffuser lens and the LED.

13. The lamp according to claim 11, in, The diffusion lens is integrally formed on the PCB substrate by injection molding.

Images