CN219498480U

CN219498480U - Laser module

Info

Publication number: CN219498480U
Application number: CN202320964879.6U
Authority: CN
Inventors: 黄伟; 曹宇星; 汪洋; 李向阳
Original assignee: Shenzhen Sunlight Technology Co ltd
Current assignee: Shenzhen Sunlight Technology Co ltd
Priority date: 2023-04-26
Filing date: 2023-04-26
Publication date: 2023-08-08
Anticipated expiration: 2033-04-26

Abstract

The utility model relates to the technical field of semiconductor light emission, and discloses a laser module which comprises an EEL light emitting chip and a total reflection prism module arranged on one side of a light emitting surface of the EEL light emitting chip. The total reflection prism module comprises at least 1 total reflection prism, and the total reflection prism comprises an inclined optical interface for generating total reflection of light. The inclined optical interface is arranged as a plane or a curved surface which forms a certain included angle with the optical axis of the incident light of the EEL light emitting chip. The total reflection prism comprises a first optical interface close to the EEL light-emitting chip for inputting light and a second optical interface far away from the EEL light-emitting chip for outputting light. The first optical interface and the second optical interface are set to be plane or curved surfaces. According to the utility model, the total reflection prism module is arranged on one side of the light emitting surface of the EEL light emitting chip, so that incident light changes the advancing direction through the total reflection effect of the total reflection prisms, and light energy can be fully utilized. The utility model has simple, reasonable and stable integral structure, small occupied space in the optical axis direction of emergent light and high emergent light precision.

Description

Laser module

Technical Field

The utility model belongs to the technical field of semiconductor light emission, and particularly relates to a laser module.

Background

Semiconductor light sources are widely used in various fields such as lighting devices, detection devices, laser radar systems, and various electronic devices because of their advantages in various aspects such as small size, low power consumption, long service life, and high brightness. Several light sources currently in common use mainly include edge-emitting lasers (EELs), vertical Cavity Surface Emitting Lasers (VCSELs), solid state lasers, fiber lasers, and the like.

The resonator is formed in parallel with the semiconductor substrate, and light is emitted from the cleaved side, and a semiconductor laser having such a structure is generally called an edge-emitting laser (EEL laser), for example, DFB, DBR, FB lasers all belong to the EEL lasers. On the other hand, a laser having a structure that emits light perpendicular to the surface of a semiconductor substrate is called a surface-emitting laser (SEL), such as a VCSEL laser. Compared with a VCSEL laser, the EEL laser has the advantages of simple process, high emission power and wider application range. When the EEL laser is used in an application scene of vertical light extraction, the light extraction direction is usually changed by changing the installation direction of the EEL laser in the prior art. Specifically, the substrate fixed with the EEL light-emitting chip is fixed on the side wall of the copper pipe for packaging, and the copper pipe is vertically installed during installation so as to meet the requirement of vertical light emission. The problem that exists, vertical installation occupation space is great, and the steadiness is not good, and the precision is not high.

Based on the above, the problems to be solved at present are: the light-emitting direction of the EEL light-emitting chip is changed through the optical lens, and meanwhile, the stability and the accuracy of the whole structure are improved.

Disclosure of Invention

The utility model aims to provide a laser module, which aims to solve the problems of changing the light emitting direction of an EEL laser in the prior art and ensuring the stability of the whole structure, high precision and high light energy utilization rate.

The utility model is realized in such a way that the laser module comprises an EEL light-emitting chip and a total reflection prism module arranged at one side of the light-emitting surface of the EEL light-emitting chip;

the total reflection prism module comprises at least 1 total reflection prism, and the total reflection prism comprises an inclined optical interface for generating total reflection of light.

Further, the oblique optical interface is set to be a plane or a curved surface with a certain included angle with the optical axis of the incident light of the EEL light-emitting chip.

Further, the total reflection prism comprises a first optical interface close to the EEL light-emitting chip for inputting light and a second optical interface far away from the EEL light-emitting chip for outputting light; the first optical interface and the second optical interface are set to be plane or curved surfaces.

Further, the total reflection prism is set as a triangular prism, and the first optical interface, the second optical interface and the oblique optical interface are in closed connection or are in indirect connection through a transition interface.

Further, the total reflection prisms are sequentially connected and integrally formed, or the total reflection prisms are respectively and independently formed and connected through the fixing support.

Further, the total reflection prism further comprises end faces arranged at two sides of the first optical interface, the second optical interface and the oblique optical interface; the EEL light emitting chips are arranged at the middle of the two end faces at intervals.

Further, the total reflection prism module comprises at least 2 total reflection prisms, and a plurality of total reflection prisms are arranged at intervals in the advancing direction of the incident light of the EEL light-emitting chip.

Further, the EEL light-emitting chip and the total reflection prism module are arranged on the substrate; and a connecting wire for electric connection is arranged between the EEL light-emitting chip and the substrate.

Further, the vertical distance from the light emitting hole of the EEL light emitting chip to the upper surface of the substrate is not more than 2/3 of the vertical distance from the highest point of the first optical interface to the upper surface of the substrate.

Further, the light emitting diode further comprises a lifting welding plate for adjusting the incidence height of incident light of the EEL light emitting chip, wherein the lifting welding plate is arranged on the substrate, and the EEL light emitting chip is arranged on the lifting welding plate.

Compared with the prior art, the laser module provided by the utility model has the following beneficial effects:

1. the utility model sets a total reflection prism module on one side of the luminous surface of the EEL luminous chip, the total reflection prism includes an oblique optical interface for total reflection of light. The light emitted by the EEL light-emitting chip is incident to the total reflection prism module and then subjected to total reflection, so that the advancing direction of the incident light is changed. Referring to fig. 4, an optical axis X of incident light of the EEL light emitting chip is parallel to an upper surface of the EEL light emitting chip, and an optical axis of emergent light is perpendicular to or forms an included angle with the upper surface of the EEL light emitting chip after the effect of the total reflection prism module is achieved, thereby achieving an effect of changing an emergent light direction of the EEL light emitting chip. The total reflection prism module can be provided with a plurality of total reflection prisms, so that the light energy waste can be reduced. The laser module provided by the utility model has the advantages of simple and reasonable overall structure, no need of vertical installation, small occupied space in the optical axis direction of emergent light, good stability and high light-emitting accuracy.

2. The total reflection prism module comprises a plurality of total reflection prisms. The light is incident from the first optical interface and reaches the inclined optical interface, the inclined optical interface is an interface of the optical dense medium and the optical sparse medium, and the inclined angle of the inclined optical interface meets the condition that the incident angle of the light is equal to or larger than a critical angle, so that the light is totally reflected and emitted from the second optical interface. The inclination angle of the inclined optical interface can be adjusted according to the angle of the emergent light, so that the requirement of the expected emergent angle is met. After passing through the first total reflection edge, part of light may not be totally reflected, but exit from the oblique optical interface through refraction and diffuse reflection, so that the light energy waste is avoided by arranging a plurality of total reflection prisms in parallel and at intervals in the advancing direction of the incident light of the EEL light-emitting chip, and the latter total reflection edge fully utilizes the light which is not utilized by the former total reflection edge.

3. The utility model also provides a heightened welding plate for adjusting the incidence height of the incident light of the EEL light-emitting chip between the EEL light-emitting chip and the substrate so as to realize ideal light-emitting effect.

Drawings

Fig. 1 is a schematic perspective view of a laser module according to the present utility model;

FIG. 2 is a top view of a laser module provided by the present utility model;

FIG. 3 is a schematic view of the cross-sectional structure in the direction A-A of FIG. 2 provided by the present utility model;

FIG. 4 is an optical path diagram of a laser module provided by the present utility model;

in the figure, 1-EEL luminous chip; 2-total reflection prism; 21-a first optical interface; 22-a second optical interface; 23-oblique optical interface; 24-end face; 3-a substrate; 4-heightening the welding plate; 5-connecting wires; x-optical axis.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The implementation of the present utility model will be described in detail below with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1-4, a preferred embodiment of the present utility model is provided.

Referring to fig. 1-2, a laser module includes an EEL light emitting chip 1 and a total reflection prism module 2. The total reflection prism module 2 is disposed at one side of the light emitting surface of the EEL light emitting chip 1. Referring to fig. 4, light emitted from the eel light emitting chip 1 is incident to the total reflection prism module 2 to be totally reflected, thereby changing the traveling direction of the incident light. The optical axis X of the incident light of the EEL light-emitting chip 1 is parallel to the upper surface of the EEL light-emitting chip 1, and a certain included angle is formed between the optical axis of the emergent light and the upper surface of the EEL light-emitting chip 1 after the effect of the total reflection prism module 2, the included angle is larger than 0 degree, and the included angle is preset according to the requirement.

The reflecting prism module 2 comprises at least 1 total reflecting prism comprising a slanted optical interface 23. The oblique optical interface 23 is arranged as a plane or curved surface forming a certain angle with the optical axis X of the incident light of the EEL light-emitting chip 1. The incident light emitted from the EEL light-emitting chip 1 is totally reflected after striking the oblique optical interface 23. Preferably, a plurality of total reflection prisms are sequentially arranged from near to far in the optical axis X direction of the incident light of the EEL light emitting chip 1, and total reflection occurs after the incident light irradiates the near total reflection prisms, if some light is emitted from the oblique optical interface 23 without total reflection, the incident light enters the far total reflection prisms, and further total reflection occurs, thereby fully utilizing the light energy. The total reflection prisms of the reflection prism module can be sequentially connected and integrally formed, or can be independently formed and connected through the fixing support. The inclination angle of the inclined optical interface 23 is adjusted according to the light-emitting effect, so long as the condition that total reflection occurs, that is, light is incident from the optically dense medium to the optically sparse medium, and the incident angle is equal to or larger than the critical angle.

The total reflection prism further comprises a first optical interface 21 for inputting light close to the EEL light emitting chip 1 and a second optical interface 22 for outputting light remote from the EEL light emitting chip 1. The first optical interface 21 and the second optical interface 22 are formed as flat surfaces or curved surfaces. The oblique optical interface 23 is disposed in the direction in which the light travels, i.e., the light is incident from the first optical interface 21 to reach the oblique optical interface 23 for total reflection and exits through the second optical interface 22. The angled optical interface 23 may be configured to connect directly with the first optical interface 21 and the second optical interface 22, or may be configured to connect indirectly through a transition interface. The total reflection prism further comprises end faces 24 provided on both sides of the first optical interface 21, the second optical interface 22 and the oblique optical interface 23. The EEL light emitting chips 1 are disposed at an interval in the middle of the two end faces 24. Ensuring full use of light energy. By adjusting the angular relationship of the first optical interface 21, the second optical interface 22 and the inclined optical interface 23 and the placement angular position relationship of the first optical interface 21, the second optical interface 22 and the inclined optical interface 23 with the EEL light-emitting chip 1, the preset light-emitting angle can be achieved, the light-emitting accuracy, the light energy utilization rate is high, and the light-emitting effect is good.

In embodiment 1, the total reflection prism is a triangular prism, and the first optical interface 21, the second optical interface 22 and the oblique optical interface 23 are all planar and are connected in a closed manner. The triple prism has simple, reasonable and stable structure, can reach a preset light-emitting angle by adjusting the angle relation of the first optical interface 21, the second optical interface 22 and the inclined optical interface 23 and the placement angle position relation of the triple prism and the EEL light-emitting chip 1, and has accurate light-emitting, high light energy utilization rate and good light-emitting effect.

Further optimizing embodiment 1, referring to fig. 3, the total reflection prism is preferably a right angle triangular prism. I.e. the first optical interface 21 is connected perpendicularly to the second optical interface 22. The end face 24 is preferably a right triangle. The light enters from the first optical interface 21 and reaches the inclined optical interface 23, the inclined optical interface 23 is an interface between an optical dense medium and an optical sparse medium, and the inclined angle of the inclined optical interface 23 meets the requirement that the incident angle of the light is equal to or larger than a critical angle, so that the light is totally reflected and exits from the second optical interface 22. The emergent light is wholly emitted to the upper surface of the EEL light-emitting chip 1 after the effect of the total reflection prism module 2, namely the optical axis direction of the emergent light is vertical to the upper surface of the EEL light-emitting chip 1 or forms an included angle larger than 0 degree with the upper surface. Preferably, the first optical interface 21 is disposed perpendicular to the optical axis X of the incident light of the EEL light-emitting chip 1, and the plurality of total reflection prisms are disposed in parallel and at intervals in the optical axis X direction of the incident light of the EEL light-emitting chip 1. The total reflection prism can be set into various prisms according to the requirement, and different placement modes and angles are not limited to the specific embodiments of the application, and the prism module for changing the advancing direction of the incident light of the EEL light emitting chip through total reflection belongs to the protection scope of the utility model.

Further preferably, the EEL light-emitting chip 1 and the total reflection prism module 2 are fixed on the substrate 3. The first optical interface 21 is disposed at a certain angle with respect to the optical axis X of the incident light of the EEL light-emitting chip 1. The total reflection prism module 2 comprises at least 2 total reflection prisms, and the total reflection prisms are arranged at intervals in the X direction of the optical axis or the light advancing direction of the incident light of the EEL light-emitting chip 1, so that the waste of light energy is avoided.

Referring to fig. 3, the vertical distance L from the light exit hole of the eel light emitting chip 1 to the upper surface of the substrate 3 is not more than 2/3 of the vertical distance H from the highest point of the first optical interface 21 to the upper surface of the substrate 3. The incident light emitted by the EEL light-emitting chip 1 is fully irradiated to the lens and is totally reflected, so that the waste of light energy is avoided.

In order to place the EEL light emitting chip 1 in an ideal position, a bump pad 4 is provided between the EEL light emitting chip 1 and the substrate 3. The incidence height of the incident light of the EEL light-emitting chip 1 is adjusted by raising the height of the bonding pad 4. And a connecting wire 5 for connecting the EEL light emitting chip 1 and the substrate 3.

It is intended that the utility model be not limited to the modifications, equivalents, and improvements made within the spirit and principles of the present utility model.

Claims

1. The laser module is characterized by comprising an EEL light-emitting chip (1) and a total reflection prism module (2) arranged on one side of a light-emitting surface of the EEL light-emitting chip (1);

the total reflection prism module (2) comprises at least 1 total reflection prism, and the total reflection prism comprises an oblique optical interface (23) for generating total reflection of light.

2. The laser module according to claim 1, characterized in that the oblique optical interface (23) is arranged as a plane or curved surface at an angle to the optical axis (X) of the incident light of the EEL light-emitting chip (1).

3. The laser module of claim 2, characterized in that the total reflection prism comprises a first optical interface (21) for inputting light close to the EEL light emitting chip (1) and a second optical interface (22) for outputting light remote from the EEL light emitting chip (1); the first optical interface (21) and the second optical interface (22) are planar or curved.

4. A laser module as claimed in claim 3, characterized in that the total reflection prism is provided as a triangular prism, the first optical interface (21), the second optical interface (22) and the oblique optical interface (23) being connected in a closed manner or indirectly via a transition interface.

5. A laser module as claimed in claim 3, characterized in that the total reflection prism further comprises end faces (24) arranged on both sides of the first optical interface (21), the second optical interface (22) and the oblique optical interface (23); the EEL light emitting chips (1) are arranged at intervals at the middle of the two end faces (24).

6. The laser module according to claim 1, characterized in that the total reflection prism module (2) comprises at least 2 total reflection prisms, which are arranged at intervals in the direction of travel of the incident light of the EEL light-emitting chip (1).

7. The laser module of claim 1, wherein a plurality of the total reflection prisms are sequentially connected and integrally formed, or a plurality of the total reflection prisms are respectively and independently formed and connected by a fixing bracket.

8. The laser module according to any of claims 1-7, further comprising a substrate (3), wherein the EEL light emitting chip (1) and the total reflection prism module (2) are provided on the substrate (3); a connecting wire (5) for electric connection is arranged between the EEL light-emitting chip (1) and the substrate (3).

9. The laser module according to claim 8, further comprising a spacer solder plate (4) for adjusting an incidence height of incident light of the EEL light emitting chip (1), the spacer solder plate (4) being provided on the substrate (3), the EEL light emitting chip (1) being provided on the spacer solder plate (4).