Total reflection optical device

Abstract

The invention relates to the technical field of semiconductor light emitting, and discloses a total reflection optical device which comprises an EEL light emitting chip and a lens. The lens includes a first optical interface, a second optical interface, and a third optical interface. An included angle alpha between a first optical axis of incident light and the first optical interface is 180 degrees gt; alpha gt; and 90 degrees. The included angle beta between the first optical axis of the incident light and the second optical interface is 90 degrees gt; beta gt; 0 DEG. Light beams of the EEL light-emitting chip are emitted after being refracted by the first optical interface, totally reflected by the second optical interface and refracted by the third optical interface, and an included angle gamma formed by a first optical axis and a second optical axis is 180 degrees gt; gamma gt; 0 DEG. According to the invention, the first optical interface can deflect light upwards, the incident angle of incident light to the second optical interface is increased, and the possibility of total reflection of the light is improved, so that side light emission of the EEL light-emitting chip is changed into front light emission, the light emission precision is high, and the light energy utilization rate is high. The overall structure is simple and reasonable, small in size and good in stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor light emitting, and in particular, relates to a total reflection optical device. Background Art

[0002] Semiconductor light sources are widely used in various lighting equipment, detection equipment, lidar systems and various electronic equipment due to their advantages of small size, low power consumption, long service life and high brightness. Currently, several common light sources include edge emitting lasers (EEL), vertical cavity surface emitting lasers (VCSEL), solid lasers and fiber lasers.

[0003] The resonator is formed parallel to the semiconductor substrate, and light is emitted from the split side. Semiconductor lasers with this structure are generally called edge-emitting lasers (EEL lasers). For example, DFB, DBR, and FB lasers are all EEL lasers. On the other hand, a laser with a structure that emits light perpendicular to the surface of the semiconductor substrate is called a surface-emitting laser (SEL), such as a VCSEL laser. Compared with VCSEL lasers, EEL lasers have the advantages of simple process, high emission power, and a wider range of uses. When the EEL laser is used in an application scenario where the light is emitted vertically, the prior art usually changes the light emission direction by changing the installation direction of the EEL laser. Specifically, the substrate on which the EEL light-emitting chip is fixed is fixed to the side wall of the copper tube used for packaging, and the copper tube is installed vertically during installation to meet the requirements of vertical light emission. There are problems that vertical installation takes up a large space, has poor stability, and is not accurate.

[0004] Based on the above, the current problem to be solved is: to change the light emission direction of the EEL light-emitting chip through an optical lens, while increasing the stability and accuracy of the overall structure and improving the utilization rate of light energy. Summary of the invention

[0005] The purpose of the present invention is to provide a total reflection optical device, aiming to solve the problems in the prior art that the optical device is large in size, difficult to integrate, has poor stability, low light energy utilization rate, and poor light output effect.

[0006] The present invention is implemented as a total reflection optical device, comprising: an EEL light emitting chip and a lens disposed on the light emitting side of the EEL light emitting chip;

[0007] The lens comprises a first optical interface for inputting light, a second optical interface for totally reflecting light, and a third optical interface for outputting light;

[0008] The angle between the first optical axis of the incident light of the EEL light-emitting chip and the first optical interface is α, 180°>α>90°;

[0009] The angle between the first optical axis of the incident light of the EEL light-emitting chip and the second optical interface is β, 90°>β>0°;

[0010] The light beam of the EEL light-emitting chip is emitted after refraction at the first optical interface, total reflection at the second optical interface and refraction at the third optical interface. The angle between the first optical axis of the incident light and the second optical axis of the emitted light is γ, 180°>γ>0°.

[0011] Furthermore, the emitted light of the EEL light emitting chip converges into a focal area at a certain distance from the third optical interface.

[0012] Furthermore, the second optical interface is configured as a micro-arc surface with a middle portion convex outwardly in a direction away from the first optical interface, and the second optical interface has a large curvature in the middle portion and a gradually decreasing curvature on both sides.

[0013] Furthermore, the first optical interface and the second optical interface satisfy that the incident angles of the incident light reaching the second optical interface after being refracted by the first optical interface are equal or similar.

[0014] Furthermore, an angle between the third optical interface and the second optical interface is θ, and 90°≥θ>0.

[0015] Furthermore, a heat sink is included, and the EEL light-emitting chip is arranged on the heat sink, and the heat sink is used to dissipate heat for the EEL light-emitting chip and adjust the installation height of the EEL light-emitting chip.

[0016] Furthermore, the first optical interface, the second optical interface and the third optical interface are respectively planes or free-form surfaces.

[0017] Furthermore, the lens is also provided with a receiving portion for connecting to the bracket; the receiving portion is arranged at the bottom of the third optical interface, the first optical interface, and the outer periphery of the second optical interface; the receiving portion connects the third optical interface and the first optical interface, and the third optical interface and the edge of the second optical interface.

[0018] Compared with the prior art, the total reflection optical device provided by the present invention has the following beneficial effects:

[0019] 1. The angle α between the first optical interface of the present invention and the first optical axis of the incident light of the EEL light-emitting chip satisfies 180°>α>90°, so that the incident light is deflected upward after passing through the first optical interface, thereby increasing the incident angle to the second optical interface, increasing the possibility of total reflection of the incident light, and achieving high light energy utilization rate of a single lens structure.

[0020] 2. The angle between the second optical interface and the first optical axis of the incident light of the EEL light-emitting chip is β, which satisfies 90°>β>0°. The angle β satisfies that the light incident on the second optical interface is totally reflected. The light beam of the EEL light-emitting chip is emitted after being refracted by the first optical interface, totally reflected by the second optical interface and refracted by the third optical interface. The angle between the second optical axis of the emitted light and the first optical axis of the incident light is γ, and 180°>γ>0°. The present invention changes the side light emission of the EEL light-emitting chip to the front light emission by setting the first optical interface, the second optical interface and the third optical interface. By setting the surface shape and the inclination angle of the first optical interface and the second optical interface, it is fully guaranteed that the light reaching the second optical interface is totally reflected, and the light emission accuracy is high and the light energy utilization rate is high. The light energy utilization rate of the present invention can achieve the utilization effect after multiple groups of lenses in the prior art are acted on multiple times. At the same time, according to the needs of the light emission angle and effect, adaptive adjustment can be made within the preset angle range of the present invention, which can meet the needs of personalized scenes. The overall structure of the present invention is simple and reasonable, small in size, stable, and easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 , Figure 2 is a cross-sectional view of a total reflection optical device provided by the present invention;

[0022] Figure 3 is a light path diagram of the total reflection optical device provided by the present invention;

[0023] Figure 4 is a cross-sectional view of a lens provided by the present invention;

[0024] In the figure: 1- EEL light-emitting chip; 2- lens; 21- first optical interface; 22- second optical interface; 23- third optical interface; 24- receiving part; 3- heat sink; X- first optical axis; Y- second optical axis. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, 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 invention 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.

[0028] Reference Figure 1-4 The figure shows a preferred embodiment of the present invention.

[0029] The total reflection optical device includes an EEL light emitting chip 1 with side light emission and a lens 2 arranged on the light emitting side of the EEL light emitting chip 1. Figure 1-2 The lens 2 is used to encapsulate and optically shape the EEL light-emitting chip 1.

[0030] The lens 2 includes a first optical interface 21 for inputting light, a second optical interface 22 for totally reflecting light, and a third optical interface 23 for outputting light. The first optical interface 21, the second optical interface 22, and the third optical interface 23 are planes or free-form surfaces. The angle between the first optical axis X of the incident light of the EEL light-emitting chip 1 and the first optical interface 21 is α, satisfying 180°>α>90°. The angle between the first optical axis X of the incident light of the EEL light-emitting chip 1 and the second optical interface 22 is β, 90°>β>0°. The cross section of the lens 2 decreases in a direction away from the third optical interface 23.

[0031] The light of the EEL light-emitting chip 1 is incident on the first optical interface 21, that is, the light propagates from the optically sparse medium to the optically dense medium and refracts. The angle between the first optical interface 21 and the first optical axis X is α, which satisfies 180°>α>90°, so the light beam is deflected upward as a whole, that is, deflected in the direction close to the front of the EEL light-emitting chip 1. The incident light reaches the second optical interface 22 after being refracted by the first optical interface 21. The angle β between the second optical interface 22 and the first optical axis X of the incident light of the EEL light-emitting chip 1 satisfies the total reflection of the incident light, that is, the light propagates from the optically dense medium to the optically sparse medium, and the incident angle is greater than or equal to the critical angle, and total reflection occurs. The setting of the angle α between the first optical interface 21 and the first optical axis X deflects the incident light upward, increases the incident angle incident to the second optical interface 22, ensures that the light incident to the second optical interface 22 is totally reflected as much as possible, and improves the utilization rate of light energy.

[0032] Reference Figure 2-3, the light emitted by the EEL light-emitting chip 1 is emitted after being refracted by the first optical interface 21, totally reflected by the second optical interface 22, and refracted by the third optical interface 23. The angle between the first optical axis X of the incident light and the second optical axis Y of the emitted light is γ, 180°>γ>0°. The present invention changes the side light emission of the EEL light-emitting chip 1 to the front light emission by setting the first optical interface 21 and the second optical interface 22, and fully ensures the total reflection of the light reaching the second optical interface 22 by optimizing the angle, and the light emission accuracy is high and the light energy utilization rate is high. The prior art mostly adopts the method of setting multiple groups of lenses on the light beam refraction path, and realizes the change of the direction of the emitted light and the full utilization of the light energy through multiple refractions, while the present invention can realize the effect of multiple groups of lenses through one lens, with high light energy utilization rate, simple structure and low production cost. According to the needs of the light emission angle and effect, adaptive adjustment can be made within the preset angle range of the present invention, which can meet the needs of personalized scenes. The overall structure of the present invention is simple and reasonable, small in size, stable, and easy to manufacture.

[0033] In a preferred embodiment, the position setting of the EEL light-emitting chip 1 and the angle setting of the first optical interface 21 and the second optical interface 22 meet the requirements that the emitted light converges into a focal area at a certain distance from the third optical interface 23. The focal area is the area where light propagation converges. Such a setting will make the light spot morphology regular and meet the needs of the application scenario. Furthermore, the second optical interface 22 is configured as a micro-arc surface with a central portion convex outward in a direction away from the first optical interface 21, and the second optical interface 22 has a large curvature in the middle and a gradually decreasing curvature on both sides. The surface shape and curvature of the second optical interface 22 meet the requirements that the incident angle of the incident light reaching the second optical interface 22 after being refracted by the first optical interface 21 is equal or close. The angle between the third optical interface 23 and the second optical interface 22 is θ, preferably: 90°≥θ>0.

[0034] Preferred embodiment: A heat sink 3 is provided at the bottom of the EEL light emitting chip 1. The heat sink 3 is used to dissipate heat for the EEL light emitting chip 1 and to adjust the installation height of the EEL light emitting chip 1. The lens 2 is also provided with a receiving portion 24, see Figure 4 The receiving portion 24 is arranged at the bottom of the third optical interface 23, the periphery of the first optical interface 21 and the second optical interface 22. The receiving portion 24 is connected to the bracket, and the EEL light emitting chip 1 and the heat sink 3 are encapsulated between the receiving portion 24 and the bracket. The receiving portion 24 connects the third optical interface 23 and the first optical interface 21, and the third optical interface 23 and the edge of the second optical interface 22.

[0035] The present invention is not limited thereto; any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A total reflection optical device, characterized in that: include: An EEL light-emitting chip (1) and a lens (2) arranged on the light-emitting side of the EEL light-emitting chip (1); The lens (2) comprises a first optical interface (21) for inputting light, a second optical interface (22) for totally reflecting light, and a third optical interface (23) for outputting light; The angle between the first optical axis (X) of the incident light of the EEL light-emitting chip (1) and the first optical interface (21) is α, 180°>α>90°; The angle between the first optical axis (X) of the incident light of the EEL light-emitting chip (1) and the second optical interface (22) is β, 90°>β>0°; The light beam of the EEL light emitting chip (1) is emitted after being refracted by the first optical interface (21), totally reflected by the second optical interface (22) and refracted by the third optical interface (23), and the angle between the first optical axis (X) of the incident light and the second optical axis (Y) of the emitted light is γ, and 180°>γ>0°.

2. The total reflection optical device according to claim 1, characterized in that: The emitted light of the EEL light-emitting chip (1) converges to form a focal area at a certain distance from the third optical interface (23).

3. The total reflection optical device according to claim 1, characterized in that: The second optical interface (22) is configured as a micro-arc surface with a central portion convex outwardly in a direction away from the first optical interface (21); the second optical interface (22) has a large curvature in the central portion and gradually decreases curvatures on both sides.

4. The total reflection optical device according to claim 1, 2 or 3, characterized in that: The first optical interface (21) and the second optical interface (22) satisfy that the incident angles of incident light reaching the second optical interface (22) after being refracted by the first optical interface (21) are equal or similar.

5. The total reflection optical device according to claim 1, characterized in that: The included angle between the third optical interface (23) and the second optical interface (22) is θ, and 90°≥θ>0.

6. The total reflection optical device according to claim 1, characterized in that: It also comprises a heat sink (3), on which the EEL light-emitting chip (1) is arranged, and the heat sink (3) is used to dissipate heat for the EEL light-emitting chip (1) and to adjust the installation height of the EEL light-emitting chip (1).

7. The total reflection optical device according to claim 1, characterized in that: The first optical interface (21), the second optical interface (22), and the third optical interface (23) are respectively planes or free-form surfaces.

8. The total reflection optical device according to claim 1, characterized in that: The lens (2) is further provided with a receiving portion (24) for connecting to a bracket; the receiving portion (24) is provided at the bottom of the third optical interface (23), the periphery of the first optical interface (21), and the second optical interface (22); the receiving portion (24) connects the third optical interface (23) and the first optical interface (21), and the edges of the third optical interface (23) and the second optical interface (22).

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