Lens and LED device adopting same

Abstract

The utility model relates to the technical field of semiconductor luminescence, and discloses a lens and an LED device using the same, and the lens comprises an optical function area and a bearing part. The optical functional region includes a light guide structure and a third optical interface. The light guide structure comprises a first optical interface on the bottom surface and used for inputting light and a second optical interface on the side surface and used for reflecting the light. A cavity structure is arranged between the second optical interface and the bearing part. An opening is formed in one side of the cavity structure. The third optical interface is a free-form surface with the center area recessed inwards, and the curvature of the third optical interface is gradually reduced from the center to the edge. By arranging the light guide structure, the height of the light-emitting surface is increased, the height of the lens is further increased, the problem of light interference is solved, and the light energy utilization rate is improved. And the surface type arrangement of the third optical interface realizes large-angle light emission and uniform light emission of the LED device. The overall structure is simple, production cost is low, and heat dissipation is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of semiconductor light emitting, and in particular relates to a lens and an LED device using the lens. Background Art

[0002] Semiconductor light sources are widely used in various lighting devices, especially in various electronic devices, because of their advantages of small size, low power consumption, long service life, high brightness, etc. LED light sources are common semiconductor light sources.

[0003] In the field of LED infrared supplementary lighting, LED devices are generally placed on the side of the lens. Fig.11 , the height of lens 6 is much greater than the height of the LED device, which causes lens 6 to interfere with and block the large-angle emitted light of the LED device, resulting in an unsatisfactory fill-in light effect. Of course, the light-emitting surface of lens 1 of the LED device can be directly raised, but according to the conservation of optical extension, the higher the lens 1, the smaller the angle, and it is impossible to achieve large-angle light emission while raising it.

[0004] Prior art 2, refer to Fig.12 , add a PCB gasket 7 at the bottom of the bracket 2 of the LED device to raise the light emitting surface of the LED device. Existing problems: complex system, low light efficiency, high cost, and poor heat dissipation.

[0005] Based on the above, the problem to be solved at present is: to provide a lens with no interference or occlusion in fill light, large light output angle, uniform light output, high light efficiency, low production cost and good heat dissipation, and an LED device using the lens. Utility Model Content

[0006] The utility model aims to provide a lens and an LED device using the lens, aiming to solve the problems in the prior art that the fill light of the LED device is easily blocked, the light output angle range is small, the uniformity is poor, the light energy utilization rate is low, the production cost is high and the heat dissipation is poor.

[0007] The utility model is implemented as follows: a lens comprises an optical functional area and a receiving portion connected to the bottom of the periphery of the optical functional area;

[0008] The optical functional area includes a light-guiding structure protruding toward the receiving portion and used for introducing light, and a third optical interface away from the receiving portion and used for outputting light; the light-guiding structure includes a first optical interface on the bottom surface for inputting light and a second optical interface on the side surface for reflecting light; a cavity structure is provided between the second optical interface and the receiving portion, and an opening is provided on a side of the cavity structure away from the third optical interface;

[0009] The third optical interface is a free-form surface whose central area is concave inward, and the curvature of the third optical interface gradually decreases from the center to the edge.

[0010] Furthermore, the cross-section of the light-guiding structure gradually increases from the first optical interface toward the third optical interface, so that the light is incident on the third optical interface after being reflected by the second optical interface.

[0011] Furthermore, the first optical interface and the second optical interface are plane surfaces or curved surfaces.

[0012] Furthermore, the top-view contour lines of the first optical interface and the third optical interface are respectively a first contour line and a second contour line, and the first contour line and the second contour line are set to be a rectangle or a quasi-rectangle.

[0013] Further, the contour line where the plane where the X-axis and Z-axis are located intersects with the third optical interface is the X-axis first curve; the contour line where the plane where the Y-axis and Z-axis are located intersects with the third optical interface is the Y-axis first curve; the contour line where the plane where the D-axis and Z-axis are located intersects with the third optical interface is the D-axis first curve; the X-axis first curve, the Y-axis first curve and the D-axis first curve are N-power curves respectively, where N is an integer greater than or equal to 3;

[0014] Among them, the X-axis, Y-axis, and Z-axis are spatial rectangular coordinate systems, the two adjacent sides of the rectangle or quasi-rectangle are parallel to the X-axis and the Y-axis respectively, and the center line of the optical functional area is parallel to the Z-axis; the axis parallel to the diagonal of the rectangle or quasi-rectangle in the plane where the X-axis and the Y-axis are located is set as the D-axis.

[0015] Furthermore, the contour line where the plane where the X-axis and Z-axis are located intersects with the second optical interface is the X-axis second curve; the contour line where the plane where the Y-axis and Z-axis are located intersects with the second optical interface is the Y-axis second curve; the contour line where the plane where the D-axis and Z-axis are located intersects with the second optical interface is the D-axis second curve; the X-axis second curve, the Y-axis second curve and the D-axis second curve are respectively N-order Bezier curves, where N is an integer greater than or equal to 1.

[0016] Furthermore, the inner side surface and the outer side surface of the receiving portion are both configured as inclined surfaces for easy demoulding, and the inclined surfaces gradually approach the center line of the optical functional area from the first optical interface to the third optical interface.

[0017] Furthermore, the light reflected by the second optical interface and then emitted by the third optical interface is equivalent to being directly emitted by the virtual light-emitting surface, the distance from the virtual light-emitting surface to the first optical interface is D2, the distance from the third optical interface to the first optical interface is D1, and D1>D2.

[0018] Furthermore, D1 and D2 satisfy: 1 ​​>D2 / D1≥25%.

[0019] An LED device, using the lens, further comprising:

[0020] A bracket, which is arranged below the lens, and the bottom of the receiving portion is connected to the bracket;

[0021] An LED light-emitting chip is arranged on the bracket and below the lens;

[0022] A light-transmitting adhesive layer is filled between the light-guiding structure and the LED light-emitting chip, and the light-transmitting adhesive layer at least covers the first optical interface and the upper surface of the LED light-emitting chip.

[0023] Compared with the prior art, the lens provided by the utility model and the LED device using the lens have the following beneficial effects:

[0024] The lens and LED device of the present invention are provided with a light guide structure 111. The second optical interface 1112 of the light guide structure 111 can make the large-angle emitted light of the LED light-emitting chip 3 propagate upward after being reflected by it, and the reflected light is then refracted by the third optical interface 1113 and then emitted. Figure 2 , Fig. 9 , the light emitted from the third optical interface 1113 is equivalent to being directly emitted from the virtual light-emitting surface S, and the light-guiding structure 111 raises the light-emitting surface from the original light-emitting surface of the LED light-emitting chip 3 to the virtual light-emitting surface S, which plays a role in raising the lens 1. Fig.10 , the height of lens 1 can be made equal to the height of lens 6, which is conducive to designing a larger light output angle. When the height of lens 1 is equal to the height of lens 6, when there is no light interference problem, the gap between the LED device and lens 6 can be set smaller, greatly reducing the volume of the module. By adjusting the inclination angle and height of the second optical interface 1112, as well as the height of the receiving portion 12, lenses 6 of different heights can be adapted to achieve personalized customization. At the same time, the light guide structure 111 makes full use of the large-angle light at the edge, thereby improving the light energy utilization rate of the LED device.

[0025] The third optical interface 1113 is set as a free-form surface with a central area concave inward, and the curvature of the third optical interface 1113 gradually decreases from the center to the edge. The above setting can make the output light of the third optical interface 1113 more divergent, which not only increases the output angle of the light at the edges, but also distributes the light energy in the central area to the surroundings, so as to achieve large-angle light output of the LED device and uniform light output. Compared with the prior art 1 and the prior art 2, the problem of light interference and shading by the lens 6 is solved, and the light output is more uniform and the light energy utilization rate is higher while ensuring large-angle light output, and the production process is simple, the production cost is low and the heat dissipation is good.

[0026] The setting of the light-transmitting adhesive layer 4 has the following advantages: 1. reducing Fresnel light loss and improving light extraction rate; 2. wavelength conversion particles can be set therein to convert the wavelength of light; 3. connecting the lens 1 and the LED light-emitting chip 3, or connecting the lens 1 and the bracket 2, so as to make the overall structure more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the cross-sectional structure of the lens provided by the utility model;

[0028] Figure 2 It is the optical path diagram of the lens provided by the utility model;

[0029] Figure 3 It is a top view of the lens provided by the utility model;

[0030] Figure 4 It is a schematic diagram of the cross-sectional structure of the plane where the X-axis and Z-axis of the lens provided by the utility model are located;

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure of the plane where the Y axis and the Z axis of the lens provided by the utility model are located;

[0032] Figure 6 It is a schematic diagram of the cross-sectional structure of the plane where the D axis and the Z axis of the lens provided by the utility model are located;

[0033] Figure 7 It is a schematic diagram of the cross-sectional structure of the LED device provided by the utility model;

[0034] Figure 8 This is a schematic cross-sectional structure diagram of another LED device provided by the utility model;

[0035] Fig. 9 It is a light path diagram of the LED device provided by the utility model;

[0036] Fig.10 This is a light path diagram of the LED device and lens combination provided by the utility model;

[0037] Fig.11 It is a light path diagram of the LED device and lens combination provided by prior art 1;

[0038] Fig.12 It is a light path diagram of the LED device and lens combination provided by the second prior art;

[0039] In the figure: 1-lens; 11-optical functional area; 111-light guiding structure; 1111-first optical interface; 1112-second optical interface; 1113-third optical interface; 12-supporting part; 121-inner side surface; 122-outer side surface; 13-cavity structure; a-first contour line; b-second contour line; c1-first curve of X axis; c2-first curve of Y axis; c3-first curve of D axis; OO'-center line; d1-second curve of X axis; d2-second curve of Y axis; d3-second curve of D axis; S-virtual light-emitting surface; 2-bracket; 3-LED light-emitting chip; 4-transparent adhesive layer; 41-reflective surface; 5-gold wire; 6-lens; 7-PCB gasket. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0041] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0042] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Reference Figure 1-10 As shown, it is a preferred embodiment provided by the utility model.

[0044] The lens of the utility model comprises an optical functional area 11 and a receiving portion 12. Figure 1 The optical functional area 11 is mainly used to optically adjust the light so that it reaches a preset optical angle and light intensity distribution. The receiving portion 12 is connected to the bottom surface of the optical functional area 11 and is used to support the optical functional area 11 and connect with the bracket 2.

[0045] The optical functional area 11 includes a light guide structure 111 protruding toward one side of the receiving portion 12 and a third optical interface 1113 disposed away from the receiving portion 12. The light guide structure 111 is used to introduce light, and includes a first optical interface 1111 on the bottom surface and a second optical interface 1112 on the side surface. The first optical interface 1111 and the second optical interface 1112 can be respectively set as a plane or a curved surface. The first optical interface 1111 is used to input light; the second optical interface 1112 is used to reflect the input edge large-angle light toward the direction of the third optical interface 1113; the third optical interface 1113 is used to output light.

[0046] The peripheral edges of the second optical interface 1112 on the side away from the first optical interface 1111 are connected to the peripheral edges of the inner side surface 121 of the receiving portion 12, and the peripheral edges of the third optical interface 1113 are connected to the peripheral edges of the outer side surface 122 of the receiving portion 12. A cavity structure 13 is provided between the second optical interface 1112 and the receiving portion 12. The cavity structure 13 surrounds the second optical interface 1112. The cavity structure 13 can contain a gas medium layer, such as an air layer, or a vacuum layer, and of course, a solid medium layer with a refractive index lower than that of the lens 1. Taking the cavity structure 13 containing an air layer as an example, the second optical interface 1112 is a plane or a curved surface in the shape of an inverted cone, that is, the second optical interface 1112 forms a certain angle with the first optical interface 1111. The edge high-angle light input through the first optical interface 1111 is incident on the interface between the second optical interface 1112 and the air layer, which is equivalent to propagating from a light-dense medium to a light-sparse medium. When the incident angle is greater than or equal to the critical angle, total reflection is likely to occur. The angle between the second optical interface 1112 and the first optical interface 1111 is set to meet the requirement of total reflection of the incident light. The cross section of the light guide structure 111 gradually increases from the first optical interface 1111 to the third optical interface 1113, so that the light is incident on the third optical interface 1113 after being reflected by the second optical interface 1112.

[0047] Further, see Figure 2 A virtual light-emitting surface S is provided in the optical functional area 11, and the light reflected by the second optical interface 1112 and then emitted by the third optical interface 1113 is equivalent to being emitted from the virtual light-emitting surface S. The distance from the virtual light-emitting surface S to the first optical interface 1111 is D2, and the distance from the third optical interface 1113 to the first optical interface 1111 is D1, and D1> D2. Preferably, D1 and D2 satisfy: 1> D2 / D1≥25%.

[0048] The utility model sets a second optical interface 1112 with a reflective effect, so that the edge large-angle light is reflected by the second optical interface 1112 and propagates toward the direction close to the optical axis, and then emerges after refraction by the third optical interface 1113. The emergent light is equivalent to being emitted from the virtual light-emitting surface S, and the light-emitting surface is increased from the light-emitting surface of the original LED light-emitting chip 3 to the virtual light-emitting surface S. The increase in the light-emitting surface can increase the height of the lens 1, which is conducive to designing a larger light-emitting angle. The light energy utilization rate of the entire system is high, and the problem of light interference and shielding is effectively solved.

[0049] The third optical interface 1113 is a free-form surface with a concave center area, and the curvature of the third optical interface 1113 gradually decreases from the center to the edge. The natural light emitted by the LED device is Lambertian distributed, with the energy being strongest in the center and gradually weakening around, and the energy distribution is uneven. The concave free-form surface of the utility model refracts the light in the center area of ​​the third optical interface 1113 to the four sides, that is, distributes the light energy in the center area to the surrounding areas, which not only increases the light output angle range of the LED device, but also makes the light energy distribution of the entire light field more uniform.

[0050] The cavity structure 13 is provided with an opening on one side away from the third optical interface 1113. In the packaging process, the cavity structure 13 is packaged between the lens 1 and the bracket 2, and the gold wire 5, the light-transmitting adhesive layer 4, etc. can also be accommodated in the cavity structure 13. Preferably, the inner side surface 121 and the outer side surface 122 of the receiving portion 12 are both set as inclined surfaces for easy demoulding, and the inclined surface gradually approaches the center line OO' of the optical functional area 11 from the first optical interface 1111 to the third optical interface 1113. Preferably, the cross section of the lens 1 is approximately M-shaped.

[0051] Preferred solution: The top view contour lines of the first optical interface 1111 and the third optical interface 1113 are respectively the first contour line a and the second contour line b, and the first contour line a and the second contour line b are preferably rectangular or quasi-rectangular. The rectangular or quasi-rectangular light spot has a high matching degree with the field of view FOV of the lens, and the fill light effect is good. Figure 3 , the X-axis, Y-axis, and Z-axis are spatial rectangular coordinate systems, the two adjacent sides of the rectangle or quasi-rectangle are set to be parallel to the X-axis and the Y-axis respectively, the center line OO' of the optical functional area 11 is parallel to the Z-axis, and the axis parallel to a diagonal line of the rectangle or quasi-rectangle in the plane where the X-axis and the Y-axis are located is set to the D-axis.

[0052] The third optical interface 1113 is a curved surface. Figure 4-6The contour line where the plane where the X-axis and Z-axis are located intersects with the third optical interface 1113 is the X-axis first curve c1, the contour line where the plane where the Y-axis and Z-axis are located intersects with the third optical interface 1113 is the Y-axis first curve c2, and the contour line where the plane where the D-axis and Z-axis are located intersects with the third optical interface 1113 is the D-axis first curve c3. The X-axis first curve c1, the Y-axis first curve c2, and the D-axis first curve c3 are N-th power curves, respectively, where N is an integer greater than or equal to 3.

[0053] The second optical interface 1112 is a curved surface. Figure 4-6 The contour line where the plane where the X-axis and Z-axis are located intersects with the second optical interface 1112 is the X-axis second curve d1, the contour line where the plane where the Y-axis and Z-axis are located intersects with the second optical interface 1112 is the Y-axis second curve d2, and the contour line where the plane where the D-axis and Z-axis are located intersects with the second optical interface 1112 is the D-axis second curve d3. The X-axis second curve d1, the Y-axis second curve d2, and the D-axis second curve d3 are respectively N-order Bezier curves, where N is an integer greater than or equal to 1.

[0054] By setting the curves on the third optical interface 1113 and the second optical interface 1112, the lens height is effectively increased, and the problem of light interference and occlusion is solved. At the same time, the light emitting angle is larger, the uniformity is better, the light spot quality is high, and the fill light effect is better.

[0055] The LED device of the utility model includes the lens described in this specification, and also includes a bracket 2, an LED light-emitting chip 3 and a light-transmitting adhesive layer 4. The bracket 2 is arranged below the lens 1, and the bottom of the receiving portion 12 is connected to the upper surface of the bracket 2. The LED light-emitting chip 3 is arranged on the bracket 2 and below the lens 1. The light-transmitting adhesive layer 4 is filled between the light-guiding structure 111 and the LED light-emitting chip 3, and the light-transmitting adhesive layer 4 at least covers the first optical interface 1111 and the upper surface of the LED light-emitting chip 3. The light-transmitting adhesive layer 4 can be used to reduce Fresnel light loss, improve light extraction rate, perform wavelength conversion, and fix the lens 1. Preferably, the refractive index of the lens 1 is greater than the refractive index of the light-transmitting adhesive layer 4.

[0056] Specifically, the light-transmitting adhesive layer 4 covers the first optical interface 1111 and the upper surface of the LED light-emitting chip 3. Figure 7 Method 2: The light-transmitting adhesive layer 4 covers the first optical interface 1111, part of the second optical interface 1112, the upper surface and side surface of the LED light-emitting chip 3, and part or all of the upper surface of the bracket 2, referring to Figure 8 Of course, based on the second method, the light-transmitting adhesive layer 4 can extend to the inner wall of the bowl-shaped bracket 2, etc.

[0057] In the first covering mode of the light-transmitting adhesive layer 4, a reflective surface 41 is provided on the side of the light-transmitting adhesive layer 4, and the reflective surface 41 is a plane or a curved surface with a certain angle to the upper surface of the LED light-emitting chip 3, so that the edge large-angle light emitted by the LED light-emitting chip 3 is incident on the reflective surface 41 for total reflection, and then enters the light-guiding structure 111 after being refracted by the first optical interface 1111. This setting can make full use of the edge large-angle light and improve the utilization rate of light energy.

[0058] A gold wire 5 for electrical connection is also provided between the bracket 2 and the LED light emitting chip 3. The gold wire 5 can be configured as follows: a portion of the gold wire 5 is provided in the light-transmitting adhesive layer 4, and another portion is provided in the cavity structure 13. Figure 7 It can also be set that all gold wires 5 are arranged in the light-transmitting adhesive layer 4, refer to Figure 8 .

[0059] Reference Fig. 9 After the light emitted by the LED light-emitting chip 3 is refracted by the first optical interface 1111, the large-angle light at the edge is reflected by the second optical interface 1112 and then refracted by the third optical interface 1113, and the light in the central area is directly refracted by the third optical interface 1113 and then emitted. A virtual light-emitting surface S is provided in the optical functional area 11, and the light emitted from the third optical interface 1113 is equivalent to being emitted directly from the virtual light-emitting surface S. Preferably, the distance from the virtual light-emitting surface S to the first optical interface 1111 is D2, and the distance from the third optical interface 1113 to the first optical interface 1111 is D1, and D1> D2. Further, D1 and D2 satisfy: 1> D2 / D1≥ 25%.

[0060] The utility model increases the light emitting surface from the upper surface of the original LED light emitting chip 3 to the virtual light emitting surface S by setting the light guide structure 111, thereby increasing the height of the light emitting surface of the lens 1-the third optical interface 1113. Fig.10 , the third optical interface 1113 can reach a height equivalent to that of the lens 6, solving the problem of light interference and shielding in the prior art one, and can reduce the gap between the lens 6 and the LED device, greatly reducing the volume of the lens module. At the same time, the third optical interface 1113 is set as a free-form surface with a central area concave inward, and the curvature of the third optical interface 1113 gradually decreases from the center to the edge, which can make the output light of the third optical interface 1113 more divergent. On the one hand, it increases the output angle of the edges around, and on the other hand, it distributes the light energy in the central area to the surroundings, so as to realize the large-angle light output of the LED device, and the light output is uniform. Compared with the prior art two, the utility model has good light output quality, does not need to use the PCB gasket 7, has good heat dissipation, simple system structure, and low production cost.

[0061] This does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lens, characterized in that: It comprises an optical functional area (11) and a receiving portion (12) connected to the bottom of the periphery of the optical functional area (11); The optical functional area (11) comprises a light-guiding structure (111) protruding toward the receiving portion (12) and used for introducing light, and a third optical interface (1113) facing away from the receiving portion (12) and used for outputting light; the light-guiding structure (111) comprises a first optical interface (1111) on the bottom surface for inputting light, and a second optical interface (1112) on the side surface for reflecting light; a cavity structure (13) is provided between the second optical interface (1112) and the receiving portion (12), and an opening is provided on a side of the cavity structure (13) away from the third optical interface (1113); The third optical interface (1113) is a free-form surface whose central area is concave inward, and the curvature of the third optical interface (1113) gradually decreases from the center to the edge.

2. The lens according to claim 1, characterized in that The cross-section of the light-guiding structure (111) gradually increases from the first optical interface (1111) to the third optical interface (1113), so as to allow light to be incident on the third optical interface (1113) after being reflected by the second optical interface (1112).

3. The lens according to claim 1, characterized in that The first optical interface (1111) and the second optical interface (1112) are plane surfaces or curved surfaces.

4. The lens according to claim 1, characterized in that The top-view contour lines of the first optical interface (1111) and the third optical interface (1113) are respectively the first contour line (a) and the second contour line (b), and the first contour line (a) and the second contour line (b) are set to be rectangular or quasi-rectangular.

5. The lens according to claim 4, characterized in that: The contour line where the plane where the X-axis and Z-axis are located intersects with the third optical interface (1113) is the first curve (c1) of the X-axis; the contour line where the plane where the Y-axis and Z-axis are located intersects with the third optical interface (1113) is the first curve (c2) of the Y-axis; the contour line where the plane where the D-axis and Z-axis are located intersects with the third optical interface (1113) is the first curve (c3) of the D-axis; the first curve (c1) of the X-axis, the first curve (c2) of the Y-axis and the first curve (c3) of the D-axis are N-power curves respectively, where N is an integer greater than or equal to 3; The X-axis, Y-axis and Z-axis are rectangular coordinate systems in space, two adjacent sides of the rectangle or quasi-rectangle are parallel to the X-axis and the Y-axis respectively, the center line (OO') of the optical functional area (11) is parallel to the Z-axis; and the axis parallel to a diagonal line of the rectangle or quasi-rectangle in the plane where the X-axis and the Y-axis are located is set as the D-axis.

6. The lens according to claim 5, characterized in that The contour line where the plane where the X-axis and Z-axis are located intersects with the second optical interface (1112) is the X-axis second curve (d1); the contour line where the plane where the Y-axis and Z-axis are located intersects with the second optical interface (1112) is the Y-axis second curve (d2); the contour line where the plane where the D-axis and Z-axis are located intersects with the second optical interface (1112) is the D-axis second curve (d3); the X-axis second curve (d1), the Y-axis second curve (d2) and the D-axis second curve (d3) are respectively N-order Bezier curves, where N is an integer greater than or equal to 1.

7. The lens according to claim 1, characterized in that The inner side surface (121) and the outer side surface (122) of the receiving portion (12) are both arranged as inclined surfaces for easy demoulding, and the inclined surfaces gradually approach the center line (OO') of the optical functional area (11) in the direction from the first optical interface (1111) to the third optical interface (1113).

8. The lens according to claim 1, characterized in that The light reflected by the second optical interface (1112) and then emitted by the third optical interface (1113) is equivalent to being directly emitted by the virtual light-emitting surface (S), the distance from the virtual light-emitting surface (S) to the first optical interface (1111) is D2, the distance from the third optical interface (1113) to the first optical interface (1111) is D1, and D1>D2.

9. The lens according to claim 8, characterized in that D1 and D2 satisfy: 1 ​​>D2 / D1≥25%.

10. An LED device, characterized in that: The lens according to any one of claims 1 to 9 further comprises: A bracket (2) is arranged below the lens, and the bottom of the receiving portion (12) is connected to the bracket (2); An LED light-emitting chip (3) is arranged on the bracket (2) and below the lens; A light-transmitting adhesive layer (4) is filled between the light-guiding structure (111) and the LED light-emitting chip (3), wherein the light-transmitting adhesive layer (4) at least covers the first optical interface (1111) and the upper surface of the LED light-emitting chip (3).

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