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

Abstract

The invention relates to the technical field of semiconductor light emitting, and discloses a lens of an asymmetric light guide structure and an LED light-emitting 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 with 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 application belongs to the technical field of semiconductor light emitting, and particularly relates to a lens with an asymmetric light guide structure and an LED light emitting device adopting the lens. BACKGROUND

[0002] The light distribution lenses currently adopted by LED light emitting devices are basically axisymmetric or rotationally symmetric. For some application scenarios, a biasing scheme is required, and the prior art usually adopts a whole deflection product or lens. However, the whole deflection product or lens has the following problems: 1. The mounting components adapted to the whole deflection product or lens need to be changed, 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 travel and brightness requirements of illumination, and the shaping difficulty is high and the light energy utilization rate is low.

[0003] Based on the above, the problems to be solved at present are to provide a lens with an asymmetric light guide structure and an LED light emitting device adopting the lens, which can realize biased light field and single-sided light distribution, has a high light energy utilization rate, is easy to be optically shaped, and has a low production cost. SUMMARY

[0004] The application aims to provide a lens with an asymmetric light guide structure and an LED light emitting device, and aims to solve the problems in the prior art that the installation of a biased light source device is difficult, the cost is high, the light energy utilization rate is low, and the optical shaping effect is poor.

[0005] The application is implemented in the following manner: the lens with an asymmetric light guide structure comprises a first optical interface for inputting light and a second optical interface for outputting light, and two sides of the first optical interface are respectively provided with a third optical interface and a fourth optical interface for reflecting light.

[0006] The profile lines of the third optical interface and the fourth optical interface on a cross section passing through an optical axis are a first profile line and a second profile line, an included angle between a straight line passing through the starting point and the ending point of the first profile line and the optical axis is θ1, and an included angle between a straight line passing through the starting point and the ending point of the second profile line and the optical axis is θ2; 0°<θ1<90°, 0°<θ2≤90°, and θ1<θ2.

[0007] Further, the second optical interface comprises a first exit surface on the same side of the optical axis as the third optical interface and a second exit surface on the same side of the optical axis as the fourth optical interface; the third optical interface satisfies that a part of light reflected thereby exits from the second exit surface.

[0008] Further, the third optical interface and the fourth optical interface are planes or curved surfaces.

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

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

[0011] Further, edges of the second optical interface, the third optical interface and the fourth optical interface are connected with receiving portions, and cavities are arranged between the receiving portions and the third optical interface and between the receiving portions and the fourth optical interface.

[0012] An LED light-emitting device employing the lens with the asymmetric light guide structure of the present application further comprises a support and an LED light-emitting chip arranged on the support, and the lens is arranged on the support and covers the LED light-emitting chip, and the first optical interface covers at least the upper surface of the LED light-emitting chip.

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

[0014] Further, the first optical interface is connected with the LED light-emitting chip through a light-transmitting glue layer.

[0015] Compared with the prior art, the lens with the asymmetric light guide structure and the LED light-emitting device employing the lens provided by the present application have the following beneficial effects:

[0016] The present application is provided with the asymmetric third optical interface 13 and the fourth optical interface 14, the third optical interface 13 and the fourth optical interface 14 have the effect of reflecting the large-angle light, improve the light energy utilization rate, and the optical shaping effect is good. 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 whole light field is biased to the side close to the fourth optical interface 14 of the optical axis Z, the light field biasing and one-side light distribution are realized. Compared with the prior art of the whole deflection product or lens, the present application realizes the precise light field biasing and one-side light distribution by asymmetrically arranging the third optical interface and the fourth optical interface with the reflecting effect, without the need for adaptive adjustment of the installation equipment, and the installation precision requirement is not high, the production cost is low, the light energy utilization rate is high, the optical shaping effect is good, BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a cross-sectional structure schematic view of the lens with the asymmetric light guide structure provided by the present application;

[0018] Figure 2 is a cross-sectional structure schematic view of another lens with the asymmetric light guide structure provided by the present application;

[0019] Figure 3is the optical path diagram of the lens of the asymmetric light guide structure provided by the present application;

[0020] Figure 4 is the cross-sectional structure schematic diagram of the lens of the asymmetric light guide structure of example one provided by the present application;

[0021] Figure 5 is the cross-sectional structure schematic diagram of the lens of the asymmetric light guide structure of example two provided by the present application;

[0022] Figure 6 is the cross-sectional structure schematic diagram of the lens of the asymmetric light guide structure of example three provided by the present application;

[0023] Figure 7 is the cross-sectional structure schematic diagram of the lens of the asymmetric light guide structure of example four provided by the present application;

[0024] Figure 8 is the cross-sectional structure schematic diagram of the first LED light emitting device provided by the present application;

[0025] Figure 9 is the cross-sectional structure schematic diagram of the second LED light emitting device provided by the present application;

[0026] Figure 10 is the cross-sectional structure schematic diagram of the third LED light emitting device provided by the present application;

[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 profile line; 14-fourth optical interface; 141-second profile line; 15-adapter; 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 scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0029] The implementation of the present application is described in detail below in combination with specific examples.

[0030] The same or similar reference signs in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0031] Referring to Figures 1-10 , the preferred embodiment provided by the present application is shown.

[0032] The lens of the asymmetric light guide 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 arranged away from the first optical interface 11. The two sides of the first optical interface 11 are respectively provided with the third optical interface 13 and the fourth optical interface 14 for reflecting light.

[0033] The profile lines intersected by the cross section through the optical axis Z of the third optical interface 13 and the fourth optical interface 14 are respectively the first profile line 131 and the second profile line 141. The angle between the straight line through the starting point and the ending point of the first profile line 131 and the optical axis Z is θ1, and the angle between the straight line through the starting point and the ending point of the second profile line 141 and the optical axis Z is θ2, referring to Figure 2 , 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, and 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] Referring to Figure 3 , the third optical interface 13 and the fourth optical interface 14 are asymmetrically arranged, 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 towards the direction close to the fourth optical interface 14, realizing the bias and unilateral light distribution of the light field.

[0035] Specifically, the third optical interface 13 is provided as an inclined plane or a 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 to. When 0° < θ2< 90°, the fourth optical interface 14 is an inclined plane or a 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. Referring to Figure 3 The large-angle light incident to the edge of the fourth optical interface 14 is totally reflected and propagates back to the direction close to the optical axis Z, which has the effect of reducing the divergence angle, is beneficial to optical shaping, and at the same time improves the light energy utilization.

[0036] Preferably, 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 part of the light reflected thereby exits from the second exit surface 122, so as to ensure that the entire light field is biased after the light passes through the lens 1, and is biased to the direction close to the second exit surface 122.

[0037] In an optimization scheme, the third optical interface 13 and the fourth optical interface 14 are provided as curved surfaces. The curvatures of the third optical interface 13 and the fourth optical interface 14 are R1 and R2 respectively, and R1 > R2 is satisfied. The heights of the third optical interface 13 and the fourth optical interface 14 are H1 and H2 respectively, and H1 > H2 is preferably satisfied. The third optical interface 13 is provided to ensure that the entire light field is biased to the side close to the fourth optical interface 14 of the optical axis Z, and unilateral distribution of light is achieved; at the same time, the fourth optical interface 14 is provided to reduce the divergence angle, perform optical shaping, and improve the light energy utilization.

[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. Or 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 support 2, so as to encapsulate the LED light emitting chip 3 between the lens 1 and the support 2. The cavity structure 16 contains an air layer, and the refractive index of the air layer is smaller than the refractive index of the lens 1, and total reflection is prone to occur at the interface thereof, 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, and when the incident angle satisfies the condition of being greater than or equal to the critical angle, total reflection occurs.

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

[0040] Embodiment one: the lens 1 of the asymmetric light guide structure includes a first optical interface 11, a second optical interface 12 and a third optical interface 13, that is, θ2=90°, the fourth optical interface 14 coincides with the first optical interface 11, for reference 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 provided as an inclined curved surface. The edge of the second optical interface 12 and the third optical interface 13 is connected with a receiving part 15, and a cavity structure 16 is provided between the receiving part 15 and the third optical interface 13. The inner side and the outer side of the receiving part 15 are provided as inclined planes or curved surfaces, and the inner side and the outer side of the receiving part 15 gradually approach the optical axis Z in the direction from the first optical interface 11 to the second optical interface 12, that is, the cavity structure 16 is opened on the side close to the first optical interface 11, and the cavity structure 16 gradually expands in the direction from the second optical interface 12 to the first optical interface 11, which is easy to demold when molding.

[0041] Embodiment two: the main difference from embodiment one is that: 1, the second optical interface 12 is a plane with the optical axis Z as the symmetry axis, for reference Figure 5 ; 2, the first optical interface 11 is provided with the third optical interface 13 and the fourth optical interface 14 on both sides, 0<θ2<90°. The third optical interface 13 and the fourth optical interface 14 are provided 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 respectively, and the inclination of the third optical interface 13 is greater than that of the fourth optical interface 14. 3, the cavity structure 16 is provided between the receiving part 15 and the third optical interface 13, and between the receiving part 15 and the fourth optical interface 14. The inner side and the outer side of the receiving part 15 are provided as inclined planes or curved surfaces, and the inner side and the outer side of the receiving part 15 gradually approach the optical axis Z in the direction from the first optical interface 11 to the second optical interface 12, that is, the cavity structure 16 is opened on the side close to the first optical interface 11, and the cavity structure 16 gradually expands in the direction from the second optical interface 12 to the first optical interface 11, which is easy to demold when molding. Other settings are the same as those of embodiment one.

[0042] Embodiment three: the main difference from embodiment two is that the second optical interface 12 is provided as an inclined plane, that is, the second optical interface 12 is a plane with a certain angle with the optical axis Z, and the angle is greater than 0° and less than 90°, for reference 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 settings are the same as those of embodiment two.

[0043] Embodiment four: the main difference from embodiment two is that the second optical interface 12 comprises a curved surface (the first exit surface 121) arranged to be inclined, and a plane (the second exit surface 122) arranged to be perpendicular to the optical axis Z, and is arranged to be asymmetric, referring to Figure 7 . The curved surface corresponds to the fourth optical interface 14, and the plane corresponds to the third optical interface 13. The higher side of the first exit surface 121 is close to the optical axis Z. Other arrangements are the same as those in embodiment two.

[0044] The LED light emitting device using the lens 1 of the present application further comprises a support 2 and an LED light emitting chip 3 arranged on the support 2, and further comprises gold wires 5 for connecting the LED light emitting chip 3 and the support 2. Referring to Figures 8-10 . The periphery of the lens 1 is arranged on the support 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] The way in which the first optical interface 11 covers the optical interface of the LED light emitting chip 3 is as follows: the first optical interface 11 is spaced apart from the LED light emitting chip 3 by an air layer, 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. The receiving portion 15 and the third optical interface 13, and the receiving portion 15 and the fourth optical interface 14 are provided with a cavity structure 16. The air layer spacing the first optical interface 11 and the LED light emitting chip 3 can be arranged to be communicated with the cavity structure 16. One end of the gold wire 5 is connected with the LED light emitting chip 3, and the other end is connected with the support 2, and most of the gold wire 5 is arranged in the air layer.

[0046] The way in which the first optical interface 11 covers the optical interface of the LED light emitting chip 3 is as follows: the first optical interface 11 is connected with the LED light emitting chip 3 through a light-transmitting adhesive layer 4, referring to Figures 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 form in which the light-transmitting adhesive layer 4 covers the LED light emitting chip 3 is as follows: ① the light-transmitting adhesive layer 4 only covers the upper surface of the LED light emitting chip 3, and a part of the gold wire 5 is arranged in the light-transmitting adhesive layer 4, and the other part is arranged in the cavity structure 16, referring to Figure 9 ; ② the light-transmitting adhesive layer 4 covers the upper surface and the side surface of the LED light emitting chip 3; ③ the light-transmitting adhesive layer 4 covers the upper surface and the side surface of the LED light emitting chip 3, and part of the upper surface or the whole upper surface of the inner part (bowl cup) of the support 2, or even covers part of the side surface or the whole side surface of the inner part (bowl cup) of the support 2, and the gold wire 5 is arranged in the light-transmitting adhesive layer 4, referring to Figure 10 .

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

[0049] Without limiting the present application, any modification, equivalent replacement and improvement etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lens of an asymmetric light guide structure, characterized by, Comprise: a first optical interface (11) for inputting light and a second optical interface (12) for outputting light, two sides of the first optical interface (11) are respectively provided with a third optical interface (13) and a fourth optical interface (14) for reflecting light; The profile 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 profile line (131) and a second profile line (141); the angle between the straight line passing through the starting point and the ending point of the first profile line (131) and the optical axis (Z) is θ1, and the angle between the straight line passing through the starting point and the ending point of the second profile line (141) and the optical axis (Z) is θ2; 0°<θ1<90°, 0°<θ2≤90°, and θ1<θ2.

2. The lens of claim 1, wherein The second optical interface (12) comprises a first exit surface (121) on the same side of the third optical interface (13) as the optical axis (Z) and a second exit surface (122) on the same side of the fourth optical interface (14) as the optical axis (Z); the third optical interface (13) satisfies that a part of light reflected thereby is emitted from the second exit surface (122).

3. The lens of claim 1, wherein The third optical interface (13) and the fourth optical interface (14) are planes or curved surfaces.

4. The lens of claim 1, wherein The first optical interface (11) is a plane or a convex or concave curved surface.

5. The lens of claim 1, wherein 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 of claim 1, wherein 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), and a cavity structure (16) is arranged 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 as claimed in any one of claims 1-6 further comprises a bracket (2) and an LED light emitting chip (3) arranged on the bracket (2), the lens is arranged on the bracket (2) and covers the LED light emitting chip (3), and the first optical interface (11) covers at least the upper surface of the LED light emitting chip (3).

8. The LED light emitting device of claim 7, wherein, The first optical interface (11) is arranged with an air layer between the first optical interface (11) and the LED light emitting chip (3).

9. The LED light emitting device of claim 7, wherein, The first optical interface (11) and the LED light emitting chip (3) are connected through a light-transmitting adhesive layer (4).

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