Laser optical device

Abstract

The invention relates to the technical field of semiconductor luminescence, and discloses a laser optical device which comprises a support, a heat sink and a lens. The lens covers the outer sides of the heat sink and the EEL light-emitting chip and comprises a cavity structure and an optical function area. The optical function area is arranged on one side of a light outlet of the EEL light-emitting chip and used for deflecting emergent light from the side face to the front face to be emitted. The optical function area comprises N optical lens parts, namely the first optical lens part, the second optical lens part to the Nth optical lens part in sequence, and N is larger than or equal to 3. The included angles between the first optical interfaces of the first optical lens part and the Nth optical lens part and the optical axis of the EEL light-emitting chip are alpha and beta respectively, and 90 degrees are greater than or equal to alphagt; 0 DEG, 180 DEG > = beta > = 90 DEG. According to the EEL light-emitting chip, by arranging the surface types of the multiple optical lens parts, the oval light of the original side face of the EEL light-emitting chip can be adjusted to be emitted from the front face, the light field is uniform, the accuracy is high, the light energy utilization rate is high, and the requirements of most scenes are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor light emitting, and in particular, relates to a laser 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 cleaved 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, lasers with a structure that emits light perpendicular to the surface of the semiconductor substrate are called surface-emitting lasers (SEL), such as VCSEL lasers. Compared with VCSEL lasers, EEL lasers have the advantages of simple process, high emission power, and a wider range of applications. Figure 6 The figure is a schematic diagram of the light emission of the EEL light-emitting chip. The EEL light-emitting chip emits light from the side and the far-field spot is an elliptical spot. In order to use the EEL laser in the application scenario of vertical light emission, 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 package copper tube. During installation, the copper tube is installed vertically so that the side of the EEL laser faces upward to meet the requirement of vertical light emission. The existing problem is that the vertical installation takes up a large space, has poor stability, and low precision, and cannot meet the requirements of the application scenario.

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

[0005] The purpose of the present invention is to provide a laser optical device, aiming to solve the problems in the prior art that the light emission direction of the EEL laser is not ideal, the uniformity of the light emission and the overall structural stability are poor, and the accuracy and light energy utilization rate are not high.

[0006] The present invention is implemented as a laser optical device comprising

[0007] Bracket;

[0008] a heat sink disposed on the bracket;

[0009] An EEL light-emitting chip is disposed on the heat sink;

[0010] A lens is arranged on the bracket and covers the heat sink and the outer side of the EEL light-emitting chip; the lens comprises a cavity structure and an optical functional area;

[0011] The heat sink and the EEL light-emitting chip are arranged in the cavity structure; the optical functional area is arranged on one side of the light outlet of the EEL light-emitting chip, and is used to deflect the light emitted from the side of the EEL light-emitting chip to the front light outlet; the optical functional area includes N optical lens parts, and the N optical lens parts are sequentially a first optical lens part, a second optical lens part, and an Nth optical lens part in a direction away from the EEL light-emitting chip, and N is greater than or equal to 3;

[0012] Each optical lens portion includes a first optical interface for inputting light and a second optical interface for outputting light; the first optical interface and the second optical interface are both planes or free-form surfaces that form a certain angle with the optical axis of the EEL light-emitting chip;

[0013] The angles between the first optical interfaces of the first optical lens unit and the Nth optical lens unit and the optical axis of the EEL light-emitting chip are α and β respectively, satisfying 90°≥α>0° and 180°≥β≥90°.

[0014] Furthermore, N optical lens parts are integrally formed, and the heights of the N optical lens parts are arranged from low to high in a direction away from the EEL light-emitting chip.

[0015] Furthermore, when N=3, the angle formed between the first optical interface of the second optical lens portion and the optical axis of the EEL light-emitting chip is γ, satisfying α<γ.

[0016] Furthermore, the cross-sections of the first optical lens portion and the second optical lens portion gradually decrease in a direction approaching the bracket.

[0017] Furthermore, the angle between the first optical interface and the second optical interface of the first optical lens unit is an acute angle; the angle between the first optical interface and the second optical interface of the second optical lens unit is an acute angle.

[0018] Furthermore, the cavity structure also includes a connecting wire for connecting the EEL light-emitting chip and the bracket.

[0019] Furthermore, the second optical interface of the Nth optical lens is a plane or a curved surface.

[0020] Compared with the prior art, the laser optical device provided by the present invention has the following beneficial effects:

[0021] 1. The present invention sets an optical functional area on the side of the EEL light emitting chip, and sets N optical lens parts in the optical functional area. Through the continuous and gradual refraction of the side light of the EEL light emitting chip by the multiple optical lens parts, the incident light on the side is emitted from the front side. Figure 5 .

[0022] Second, by setting the surface shape of N optical lens parts, the original light distribution state of the EEL light-emitting chip can be readjusted. The original light output of the EEL light-emitting chip is an elliptical Gaussian distribution. After multiple refractions of multiple optical lens parts, the light field can be distributed into a circular or rectangular shape. The light field is uniform and highly accurate, meeting the requirements of most scenes while reducing energy loss.

[0023] 3. The angles between the first optical interface of the first optical lens unit and the Nth optical lens unit and the optical axis of the EEL light-emitting chip are α and β respectively, satisfying 90°≥α>0°, 180°≥β≥90°. The heights of the N optical lens units are arranged from low to high in the direction away from the EEL light-emitting chip, ensuring that the light can be deflected toward the front and finally emitted from the front. At the same time, the emitted light of the second optical interface of the adjacent previous optical lens unit can completely enter the first optical interface of the next optical lens unit, thereby improving the utilization rate of light energy.

[0024] When light is incident on a first optical interface with a certain inclination, the light enters an optically dense medium from an optically sparse medium and is refracted; after refraction, the light is incident on a second optical interface with a certain inclination, the light enters an optically sparse medium from an optically dense medium and is further refracted. The light passes through the refraction effect of N optical lens units in sequence, gradually increasing the angle of deviation from the original optical axis, and the optical axis of the final output light is perpendicular to or at a certain angle to the front of the EEL light-emitting chip. The surface shape and position setting of the optical lens unit meet the requirements of the refraction direction and angle, and the front light is output with precise light output, high brightness and good uniformity. The N optical lens units are integrally formed, with a simple and stable structure, easy to manufacture, and occupy less space in the direction of the optical axis of the output light, further ensuring the accuracy of the light output. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a top view of the laser optical device provided by the present invention;

[0026] Figure 2 , Figure 3 The present invention provides Figure 1 Schematic diagram of the AA-direction section structure;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the laser optical device provided by the present invention;

[0028] Figure 5is a light path diagram of the laser optical device provided by the present invention;

[0029] Figure 6 It is a light emission schematic diagram of an EEL light emitting chip in the prior art.

[0030] In the figure: 1- bracket; 2- heat sink; 3- EEL light-emitting chip; 4- lens; 41- cavity structure; 42- optical functional area; 421- first optical lens part; 422- second optical lens part; 423- Nth optical lens part; 401- first optical interface; 402- second optical interface; 5- connecting line; X- optical axis. DETAILED DESCRIPTION

[0031] 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.

[0032] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0033] 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.

[0034] Reference Figure 1-6 The figure shows a preferred embodiment of the present invention.

[0035] Reference Figure 1-4The laser optical device includes a bracket 1, and the bracket 1 can be set as a bowl-shaped bracket or a flat bracket, etc. A lens 4 is fixed on the bracket 1, and a heat sink 2 and an EEL light-emitting chip 3 are encapsulated between the lens 4 and the bracket 1. The lens 4 includes a cavity structure 41 and an optical functional area 42 for accommodating the heat sink 2 and the EEL light-emitting chip 3. The cavity structure 41 also includes a connecting wire 5 for connecting the EEL light-emitting chip 3 and the bracket 1. The heat sink 2 is fixed on the bracket 1 and in the cavity structure 41, and the EEL light-emitting chip 3 is fixed on the heat sink 2. The heat sink 2 is used to help the EEL light-emitting chip 3 dissipate heat and adjust the installation height of the EEL light-emitting chip 3. The light outlet of the EEL light-emitting chip 3 is arranged on the side of the EEL light-emitting chip 3 and corresponds to the optical functional area 42. The optical functional area 42 refracts the light emitted from the side of the EEL light-emitting chip 3 to the front light by setting N optical lens parts.

[0036] The N optical lens portions are the first optical lens portion 421, the second optical lens portion 422 ..., the Nth optical lens portion 423 in the direction away from the EEL light-emitting chip 3, N is a natural number greater than or equal to 3, and N is an approximate number. The number of optical lens portions can be adjusted according to the output angle and effect. The output light from the side of the EEL light-emitting chip 3 is refracted by the first optical lens portion 421, the second optical lens portion 422 ... the Nth optical lens portion 423 in turn, and then outputs from the front of the EEL light-emitting chip 3. The entire structure is stable and the light output is accurate. The setting of the N optical lens portions can also make full use of light energy.

[0037] Each optical lens unit includes a first optical interface 401 for inputting light and a second optical interface 402 for outputting light. The first optical interface 401 and the second optical interface 402 are both planes or free-form surfaces that have a certain angle with the optical axis X of the EEL light-emitting chip 3, and the angle is adjusted according to the required light-emitting effect. The second optical interface 402 of the previous optical lens unit is arranged close to the first optical interface 401 of the next optical lens unit, and all the emitted light of the previous optical lens unit enters the next optical lens unit. The angles between the first optical interface 401 of the first optical lens unit 421 and the Nth optical lens unit 423 and the optical axis X of the EEL light-emitting chip 3 are α and β, respectively, satisfying 90°≥α>0°, 180°≥β≥90°. This arrangement ensures the light emission from the front.

[0038] Principle: The light emitted by the EEL light emitting chip 3 is incident through the first optical interface 401 of the first optical lens unit 421, and the light beam enters the optically dense medium from the optically sparse medium and is refracted, and is deflected toward the front direction of the EEL light emitting chip 3; then it is emitted through the second optical interface 402 of the first optical lens unit 421, and at this time, the light beam enters the optically sparse medium from the optically dense medium and is refracted, and is deflected toward the front direction of the EEL light emitting chip 3 again. Figure 5Similarly, the outgoing light of the first optical lens unit 421 is incident through the first optical interface 401 of the second optical lens unit 422 and is emitted through the second optical interface 402, and is further deflected toward the front direction of the EEL light-emitting chip 3. The final light beam is emitted from the second optical interface 402 of the Nth optical lens unit 423. The light passes through the refraction effect of N optical lens units in sequence, and the angle of deviation from the original optical axis X is gradually increased. The optical axis of the final outgoing light is perpendicular to the front of the EEL light-emitting chip 3 or at a certain angle. The surface shape and position setting of the optical lens unit meet the requirements of the refraction direction and angle, and the front light is realized, with precise light emission, high brightness and good uniformity. The second optical interface 402 of the Nth optical lens unit 423 is set to a plane or a curved surface. The light spot formed by the light emitted by the EEL light-emitting chip 3 after being refracted by the lens 4 is preferably a circular or rectangular spot.

[0039] Preferred solution: N optical lens parts are integrally formed, and the heights of the N optical lens parts are arranged from low to high in the direction away from the EEL light-emitting chip 3. The above arrangement ensures that the outgoing light beam after being refracted by the adjacent previous optical lens part can be fully incident on the next optical lens part, and is continuously and gradually deflected to the preset angle multiple times, so that the light output effect is complete and the waste of light energy is avoided. The N optical lens parts are integrally formed, the structure is simple and stable, easy to manufacture, and takes up less space in the optical axis direction of the outgoing light, further ensuring the accuracy of the light output.

[0040] Further, when N=3, the angle between the first optical interface 401 of the second optical lens part 422 and the optical axis X of the EEL light-emitting chip 3 is γ, satisfying α<γ. The cross sections of the first optical lens part 421 and the second optical lens part 422 taper in the direction close to the bracket 1. The cross sections of the first optical lens part 421 and the second optical lens part 422 are in the shape of an inverted peak. The first optical interface 401 and the second optical interface 402 are set as a plane or a curved surface, and the angle between the first optical interface 401 and the second optical interface 402 of the first optical lens part 421 is an acute angle; the angle between the first optical interface 401 and the second optical interface 402 of the second optical lens part 422 is an acute angle. The present invention can adjust the original elliptical light distribution of the side of the EEL light-emitting chip to a circular or rectangular light distribution on the front side by setting the surface shape of multiple optical lens parts, and the light field is uniform, the accuracy is high, and the light energy utilization rate is high, which meets the requirements of most scenes.

[0041] 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 laser optical device, characterized in that: include: Bracket (1); A heat sink (2) disposed on the support (1); An EEL light-emitting chip (3) disposed on the heat sink (2); A lens (4) is arranged on the support (1) and covers the outer sides of the heat sink (2) and the EEL light-emitting chip (3); the lens (4) comprises a cavity structure (41) and an optical functional area (42); The heat sink (2) and the EEL light-emitting chip (3) are arranged in the cavity structure (41); the optical function area (42) is arranged on one side of the light outlet of the EEL light-emitting chip (3) and is used to deflect the light emitted from the side of the EEL light-emitting chip (3) to the front side; The optical functional area (42) comprises N optical lens portions, wherein the N optical lens portions are, in order along a direction away from the EEL light-emitting chip (3), a first optical lens portion (421), a second optical lens portion (422), and an Nth optical lens portion (423), where N≥3; Each optical lens portion comprises a first optical interface (401) for inputting light and a second optical interface (402) for outputting light; the first optical interface (401) and the second optical interface (402) are both planes or free-form surfaces that form a certain angle with the optical axis (X) of the EEL light-emitting chip (3); The angles between the first optical interface (401) of the first optical lens portion (421) and the Nth optical lens portion (423) and the optical axis (X) of the EEL light-emitting chip (3) are α and β, respectively, satisfying 90°≥α>0° and 180°≥β≥90°.

2. The laser optical device according to claim 1, characterized in that The N optical lens parts are integrally formed, and the heights of the N optical lens parts are arranged from low to high in a direction away from the EEL light-emitting chip (3).

3. The laser optical device according to claim 2, characterized in that When N=3, the angle formed between the first optical interface (401) of the second optical lens portion (422) and the optical axis (X) of the EEL light-emitting chip (3) is γ, satisfying α<γ.

4. The laser optical device according to claim 3, characterized in that The cross-sections of the first optical lens portion (421) and the second optical lens portion (422) gradually decrease in a direction approaching the bracket (1).

5. The laser optical device according to claim 4, characterized in that The angle between the first optical interface (401) and the second optical interface (402) of the first optical lens portion (421) is an acute angle; the angle between the first optical interface (401) and the second optical interface (402) of the second optical lens portion (422) is an acute angle.

6. The laser optical device according to claim 1, characterized in that The cavity structure (41) also includes a connecting wire (5) for connecting the EEL light-emitting chip (3) and the bracket (1).

7. The laser optical device according to claim 1, characterized in that: The second optical interface (402) of the Nth optical lens portion (423) is a plane or a curved surface.

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