Lens with asymmetric light guide structure and LED (light-emitting diode) light-emitting device adopting lens

Abstract

The utility model relates to the technical field of semiconductor luminescence, and discloses a lens with an asymmetric light guide structure and an LED luminescent device adopting the lens. The lens includes a first optical interface and a second optical interface. A third optical interface and a fourth optical interface which are used for reflecting light are arranged on the two sides of the first optical interface respectively. The contour lines of the third optical interface and the fourth optical interface on the section cutting plane passing through the optical axis are a first contour line and a second contour line. Included angles theta 1 and theta 2 are respectively formed between the straight line passing through the starting point and the ending point of the first contour line and the optical axis and between the straight line passing through the starting point and the ending point of the second contour line and the optical axis and meet 0 degree lt; [theta] 1lt; 90 degrees, 0 degree lt; theta2 is less than or equal to 90 degrees, and theta1lt; [theta] 2. By asymmetrically arranging the third optical interface and the fourth optical interface which have the reflection function, light field bias and single-side light distribution are achieved, the light energy utilization rate is high, the optical shaping effect is good, and the production cost is low.

Description

Technical Field

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

[0002] The light distribution lenses currently used in LED light-emitting devices are basically axially symmetrical or rotationally symmetrical. For some application scenarios, a bias solution is required, and the existing technology mostly uses integral deflection products or lenses. However, integral deflection products or lenses: 1. It is necessary to change the mounting components that are compatible with them, which increases the installation difficulty and use cost of the light source device; 2. The far-field distribution after light deflection usually cannot meet the irradiation range and brightness requirements, and the shaping difficulty is high and the light energy utilization rate is low.

[0003] Based on the above, the problem to be solved at present is: to provide a lens with an asymmetric light-guiding structure that can achieve biased light field, one-sided light distribution, high light energy utilization, easy optical shaping, and low production cost, and an LED light-emitting device using the lens. Utility Model Content

[0004] The purpose of the utility model is to provide a lens and LED light-emitting device with an asymmetric light-guiding structure, aiming to solve the problems in the prior art that the biased light source device is difficult to install, has high cost, has low light energy utilization and poor optical shaping effect.

[0005] The utility model is implemented as follows: the lens of the asymmetric light-guiding structure comprises: a first optical interface for inputting light and a second optical interface for outputting light, and a third optical interface and a fourth optical interface for reflecting light are respectively arranged on both sides of the first optical interface;

[0006] The contour lines of the third optical interface and the fourth optical interface on the cross-section surface passing through the optical axis are the first contour line and the second contour line; the angle between the straight line passing through the starting point and the end point of the first contour line and the optical axis is θ1, and the angle between the straight line passing through the starting point and the end point of the second contour line and the optical axis is θ2; 0°<θ1<90°, 0°<θ2≤90°, and θ1<θ2 are satisfied.

[0007] Furthermore, the second optical interface includes a first exit surface arranged on the same side of the optical axis as the third optical interface and a second exit surface arranged on the same side of the optical axis as the fourth optical interface; the third optical interface satisfies that a portion of the light reflected by it is emitted from the second exit surface.

[0008] Furthermore, the third optical interface and the fourth optical interface are plane surfaces or curved surfaces.

[0009] Furthermore, the first optical interface is a plane or a convex curved surface or a concave curved surface.

[0010] Furthermore, the second optical interface is a plane or a curved surface or a combination of a plane and a curved surface.

[0011] Furthermore, edges of the second optical interface, the third optical interface and the fourth optical interface are connected with a receiving portion, and a cavity structure is provided between the receiving portion and the third optical interface and between the receiving portion and the fourth optical interface.

[0012] An LED light-emitting device using a lens with an asymmetric light-guiding structure of the utility model also includes a bracket and an LED light-emitting chip arranged on the bracket, the lens is arranged on the bracket and covers the LED light-emitting chip, and the first optical interface at least covers the upper surface of the LED light-emitting chip.

[0013] Furthermore, an air layer is provided between the first optical interface and the LED light-emitting chip.

[0014] Furthermore, the first optical interface and the LED light-emitting chip are connected via a light-transmitting adhesive layer.

[0015] Compared with the prior art, the lens with an asymmetric light-guiding structure and the LED light-emitting device using the lens provided by the utility model have the following beneficial effects:

[0016] The utility model is provided with an asymmetric third optical interface 13 and a fourth optical interface 14. The third optical interface 13 and the fourth optical interface 14 have the function of reflecting edge large-angle light, thereby improving the utilization rate of light energy and achieving a good optical shaping effect. The angle θ1 between the third optical interface 13 and the optical axis Z is smaller than the angle θ2 between the fourth optical interface 14 and the optical axis Z, that is, the third optical interface 13 is closer to the optical axis Z than the fourth optical interface 14. After the action of the third optical interface 13 and the fourth optical interface 14, the entire light field is biased toward the side of the optical axis Z close to the fourth optical interface 14, thereby achieving light field bias and unilateral light distribution. Compared with the overall deflection products or lenses in the prior art, the utility model realizes precise light field bias and unilateral light distribution by asymmetrically setting the third optical interface and the fourth optical interface with a reflective effect; there is no need to adjust the adaptability of the installation equipment, and at the same time, the installation accuracy requirement is not high, and the production cost is low; and the light energy utilization rate is high and the optical shaping effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of a lens with an asymmetric light-guiding structure provided by the utility model;

[0018] Figure 2 It is a schematic cross-sectional structure diagram of another lens with an asymmetric light-guiding structure provided by the utility model;

[0019] Figure 3 It is a light path diagram of a lens with an asymmetric light guiding structure provided by the utility model;

[0020] Figure 4 It is a schematic cross-sectional structure diagram of a lens of an asymmetric light-guiding structure according to the first embodiment of the present invention;

[0021] Figure 5 It is a schematic cross-sectional structure diagram of a lens of an asymmetric light-guiding structure according to the second embodiment of the present invention;

[0022] Figure 6 It is a schematic cross-sectional structure diagram of a lens of an asymmetric light-guiding structure according to the third embodiment of the present invention;

[0023] Figure 7 It is a schematic cross-sectional structure diagram of a lens of an asymmetric light-guiding structure according to a fourth embodiment of the present invention;

[0024] Figure 8 This is a schematic cross-sectional structure diagram of the first LED light-emitting device provided by the utility model;

[0025] Fig. 9 It is a schematic cross-sectional structure diagram of a second LED light-emitting device provided by the utility model;

[0026] Fig.10 This is a schematic cross-sectional structure diagram of a third LED light-emitting device provided by the utility model;

[0027] In the figure: 1-lens; 11-first optical interface; 12-second optical interface; 121-first exit surface; 122-second exit surface; 13-third optical interface; 131-first contour line; 14-fourth optical interface; 141-second contour line; 15-supporting part; 16-cavity structure; 2-bracket; 3-LED light-emitting chip; 4-transparent adhesive layer; 5-gold wire; Z-optical axis. DETAILED DESCRIPTION

[0028] 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.

[0029] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0030] 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.

[0031] Reference Figure 1-10 As shown, it is a preferred embodiment provided by the utility model.

[0032] The lens of the asymmetric light-guiding structure is used for the first optical interface 11 for inputting light and the second optical interface 12 for outputting light, referring to Figure 1 The second optical interface 12 is disposed away from the first optical interface 11. A third optical interface 13 and a fourth optical interface 14 for reflecting light are disposed on both sides of the first optical interface 11, respectively.

[0033] The contour lines of the third optical interface 13 and the fourth optical interface 14 intersecting with the section plane passing through the optical axis Z are the first contour line 131 and the second contour line 141 respectively. The straight line passing through the starting point and the end point of the first contour line 131 and the optical axis Z form an angle of θ1, and the straight line passing through the starting point and the end point of the second contour line 141 and the optical axis Z form an angle of θ2. Figure 2 , satisfying 0°<θ1<90°, 0°<θ2≤90°, and θ1<θ2. When 0°<θ2<90°, the optical axis Z preferably passes through the center of the first optical interface 11. If the first optical interface 11 is a plane, the optical axis Z preferably passes through the center of the first optical interface 11 and is approximately perpendicular to the first optical interface 11.

[0034] Reference Figure 3 The third optical interface 13 and the fourth optical interface 14 are arranged asymmetrically, and the third optical interface 13 is closer to the optical axis Z than the fourth optical interface 14. After the edge large-angle light is reflected by the fourth optical interface 14, the entire light field deviates from the optical axis Z and is biased toward the direction close to the fourth optical interface 14, thereby realizing the bias of the light field and unilateral light distribution.

[0035] Specifically, the third optical interface 13 is set as an inclined plane or curved surface, that is, the third optical interface 13 gradually moves away from the optical axis Z in the direction from the first optical interface 11 to the second optical interface 12. When θ2=90°, the fourth optical interface 14 can be a plane perpendicular to the optical axis Z and overlapping with the first optical interface 11, referring to Figure 4, of course not limited thereto. When 0°<θ2<90°, the fourth optical interface 14 is an inclined plane or curved surface, that is, the fourth optical interface 14 gradually moves away from the optical axis Z in the direction from the first optical interface 11 to the second optical interface 12. Figure 3 The large-angle edge light incident on the fourth optical interface 14 is totally reflected and then propagates toward the direction close to the optical axis Z, which has the effect of reducing the divergence angle, is beneficial to optical shaping, and improves the utilization rate of light energy.

[0036] Preferably, with the optical axis Z as the dividing line, the second optical interface 12 includes a first exit surface 121 on the same side of the optical axis Z as the third optical interface 13 and a second exit surface 122 on the same side of the optical axis Z as the fourth optical interface 14. The third optical interface 13 satisfies that a portion of the light reflected by it is emitted from the second exit surface 122, ensuring that after the light passes through the lens 1, the entire light field is biased in a direction close to the second exit surface 122.

[0037] Optimization scheme, the third optical interface 13 and the fourth optical interface 14 are set as curved surfaces. The curvatures of the third optical interface 13 and the fourth optical interface 14 are R1 and R2 respectively, satisfying R1>R2. The heights of the third optical interface 13 and the fourth optical interface 14 are H1 and H2 respectively, preferably satisfying H1>H2. The setting of the third optical interface 13 ensures that the entire light field is biased toward the side of the optical axis Z close to the fourth optical interface 14, and realizes unilateral light distribution; at the same time, the setting of the fourth optical interface 14 can reduce the divergence angle, perform optical shaping, and improve the utilization rate of light energy.

[0038] The edges of the second optical interface 12, the third optical interface 13 and the fourth optical interface 14 are connected with a receiving portion 15. Alternatively, a cavity structure 16 is provided between the receiving portion 15 and the third optical interface 13, and between the receiving portion 15 and the fourth optical interface 14, that is, the cavity structure 16 surrounds the third optical interface 13 and the fourth optical interface 14. The receiving portion 15 is used to support the first optical interface 11, the second optical interface 12, the third optical interface 13 and the fourth optical interface 14, and is also used to connect with the bracket 2 to encapsulate the LED light-emitting chip 3 between the lens 1 and the bracket 2. The cavity structure 16 contains an air layer, and the refractive index of the air layer is less than the refractive index of the lens 1. Total reflection is easy to occur at its interface, that is, the third optical interface 13 and the fourth optical interface 14. The inclined third optical interface 13 and the fourth optical interface 14 increase the incident angle. When the incident angle satisfies or is greater than or equal to the critical angle, total reflection occurs.

[0039] The first optical interface 11 can be set as a plane or a convex curved surface or a concave curved surface. The second optical interface 12 can be set as a plane or a curved surface or a combination of a plane and a curved surface. Specific embodiments are as follows:

[0040] Embodiment 1: The lens 1 of the asymmetric light-guiding structure comprises a first optical interface 11, a second optical interface 12 and a third optical interface 13, that is, θ2=90°, and the fourth optical interface 14 coincides with the first optical interface 11, referring to Figure 4 . The first optical interface 11 is a plane. The second optical interface 12 is a free-form surface. The third optical interface 13 is set as an inclined curved surface. A receiving portion 15 is connected to the edges of the second optical interface 12 and the third optical interface 13, and a cavity structure 16 is provided between the receiving portion 15 and the third optical interface 13. The inner and outer side surfaces of the receiving portion 15 are set as inclined planes or curved surfaces, and the inner and outer side surfaces of the receiving portion 15 gradually approach the optical axis Z from the first optical interface 11 to the second optical interface 12, that is, the cavity structure 16 opens on the side close to the first optical interface 11, and the cavity structure 16 gradually expands from the second optical interface 12 to the first optical interface 11, which is easy to demold during molding.

[0041] Embodiment 2: The main differences from Embodiment 1 are as follows: 1. The second optical interface 12 is a plane with the optical axis Z as the axis of symmetry. Figure 5 ; 2. A third optical interface 13 and a fourth optical interface 14 are respectively provided on both sides of the first optical interface 11, 0<θ2<90°. The third optical interface 13 and the fourth optical interface 14 are configured as inclined planes or curved surfaces for reflecting light. The third optical interface 13 and the fourth optical interface 14 are asymmetrically arranged. In the direction from the first optical interface 11 to the second optical interface 12, the third optical interface 13 and the fourth optical interface 14 gradually move away from the optical axis Z, and the inclination of the third optical interface 13 is greater than the inclination of the fourth optical interface 14. 3. A cavity structure 16 is provided between the receiving portion 15 and the third optical interface 13, and between the receiving portion 15 and the fourth optical interface 14. The inner side and outer side of the receiving portion 15 are set as inclined planes or curved surfaces, and the inner side and outer side of the receiving portion 15 gradually approach the optical axis Z from the first optical interface 11 to the second optical interface 12, that is, the cavity structure 16 opens on the side close to the first optical interface 11, and the cavity structure 16 gradually expands from the second optical interface 12 to the first optical interface 11, which is easy to demold during molding. Other settings are the same as those in the first embodiment.

[0042] Embodiment 3: The main difference from Embodiment 2 is that the second optical interface 12 is set as an inclined plane, that is, the second optical interface 12 is a plane that forms a certain angle with the optical axis Z, and the angle is greater than 0° and less than 90°. Figure 6 The higher side of the second optical interface 12 corresponds to the third optical interface 13, and the lower side corresponds to the fourth optical interface 14. Other configurations are the same as those in the second embodiment.

[0043] Embodiment 4: The main difference from Embodiment 2 is that the second optical interface 12 includes an inclined curved surface (first emitting surface 121) and a plane (second emitting surface 122) perpendicular to the optical axis Z, which is an asymmetrical arrangement. Figure 7 The curved surface corresponds to the fourth optical interface 14, and the flat surface corresponds to the third optical interface 13. The higher side of the first exit surface 121 is close to the optical axis Z. Other settings are the same as those in the second embodiment.

[0044] The LED light emitting device using the lens 1 of the utility model further comprises a bracket 2 and an LED light emitting chip 3 arranged on the bracket 2, and a gold wire 5 for connecting the LED light emitting chip 3 and the bracket 2. Figure 8-10 The bottom of the lens 1 is arranged on the bracket 2 and covers the LED light emitting chip 3. The first optical interface 11 covers the upper surface of the LED light emitting chip 3.

[0045] Method 1 of covering the optical interface of the LED light emitting chip 3 by the first optical interface 11: an air layer is separated from the first optical interface 11 and the LED light emitting chip 3, referring to Figure 8 Preferably, the edges of the second optical interface 12, the third optical interface 13 and the fourth optical interface 14 are connected with a receiving portion 15. A cavity structure 16 is provided between the receiving portion 15 and the third optical interface 13, and between the receiving portion 15 and the fourth optical interface 14. The air layer between the first optical interface 11 and the LED light-emitting chip 3 can be arranged to be connected to the cavity structure 16. One end of the gold wire 5 is connected to the LED light-emitting chip 3, and the other end is connected to the bracket 2, and most of it is arranged in the air layer.

[0046] The first optical interface 11 covers the optical interface of the LED light emitting chip 3. The first optical interface 11 is connected to the LED light emitting chip 3 through a transparent adhesive layer 4. Figure 9-10 The light-transmitting adhesive layer 4 at least closely adheres to the first optical interface 11 and the upper surface of the LED light-emitting chip 3 .

[0047] Specifically: 1. The transparent adhesive layer 4 covers the LED light emitting chip 3: ① The transparent adhesive layer 4 only covers the upper surface of the LED light emitting chip 3, a part of the gold wire 5 is arranged in the transparent adhesive layer 4, and the other part is arranged in the cavity structure 16, refer to Fig. 9 ;② The light-transmitting adhesive layer 4 covers the upper surface and side surfaces of the LED light-emitting chip 3; (③ The light-transmitting adhesive layer 4 covers the upper surface and side surfaces of the LED light-emitting chip 3, as well as part or all of the upper surface of the inner portion (bowl) of the bracket 2, and may even cover part or all of the side surfaces of the inner portion (bowl) of the bracket 2, and the gold wire 5 is entirely arranged in the light-transmitting adhesive layer 4, refer to Fig.10 .

[0048] 2. The light-transmitting adhesive layer 4 covers the lens 1 in the following forms: ① only covers the first optical interface 11; ② covers the first optical interface 11 and part or all of the third optical interface 13; ③ covers the first optical interface 11, part or all of the third optical interface 13 and part or all of the fourth optical interface 14.

[0049] 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 with an asymmetric light-guiding structure, characterized in that: include: A first optical interface (11) for inputting light and a second optical interface (12) for outputting light, wherein a third optical interface (13) and a fourth optical interface (14) for reflecting light are respectively provided on both sides of the first optical interface (11); The contour lines of the third optical interface (13) and the fourth optical interface (14) on the section plane passing through the optical axis (Z) are a first contour line (131) and a second contour line (141); the angle between the straight line passing through the starting point and the end point of the first contour line (131) and the optical axis (Z) is θ1, and the angle between the straight line passing through the starting point and the end point of the second contour line (141) and the optical axis (Z) is θ2; 0°<θ1<90°, 0°<θ2≤90°, and θ1<θ2 are satisfied.

2. The lens according to claim 1, characterized in that The second optical interface (12) comprises a first exit surface (121) arranged on the same side of the optical axis (Z) as the third optical interface (13), and a second exit surface (122) arranged on the same side of the optical axis (Z) as the fourth optical interface (14); the third optical interface (13) satisfies that a portion of the light reflected by it is emitted from the second exit surface (122).

3. The lens according to claim 1, characterized in that The third optical interface (13) and the fourth optical interface (14) are plane surfaces or curved surfaces.

4. The lens according to claim 1, characterized in that The first optical interface (11) is a plane or a convex curved surface or a concave curved surface.

5. The lens according to claim 1, characterized in that The second optical interface (12) is a plane or a curved surface or a combination of a plane and a curved surface.

6. The lens according to claim 1, characterized in that A receiving portion (15) is connected to the edges of the second optical interface (12), the third optical interface (13) and the fourth optical interface (14); a cavity structure (16) is provided between the receiving portion (15) and the third optical interface (13), and between the receiving portion (15) and the fourth optical interface (14).

7. An LED light-emitting device, characterized in that: The lens according to any one of claims 1 to 6 further comprises a bracket (2) and an LED light-emitting chip (3) arranged on the bracket (2), wherein the lens is arranged on the bracket (2) and covers the LED light-emitting chip (3), and the first optical interface (11) at least covers the upper surface of the LED light-emitting chip (3).

8. The LED light emitting device according to claim 7, characterized in that: The first optical interface (11) and the LED light-emitting chip (3) are arranged with an air layer between them.

9. The LED light emitting device according to claim 7, characterized in that: The first optical interface (11) and the LED light-emitting chip (3) are connected via a light-transmitting adhesive layer (4).

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