CN113552761A

CN113552761A - Reflective laser light combining system

Info

Publication number: CN113552761A
Application number: CN202110844496.0A
Authority: CN
Inventors: 钟建; 权志豪; 成桂霖; 郭天弦; 项宗
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-10-26

Abstract

The invention discloses a reflective laser light combining system, which belongs to the technical field of laser projection and solves the problems of large occupied space and insufficient laser projection brightness of a lens group and a band-pass filter for completing light combination; each reflector corresponds to a light beam of a light source, the direction of an incident light beam is changed into a uniform direction, and the reflectors are spliced, so that the number of light-combining optical path devices is reduced, the structure of the system is optimized, and the loss of accuracy caused by a complex process is avoided.

Description

Reflective laser light combining system

Technical Field

The invention belongs to the technical field of laser projection, and particularly relates to a reflective laser light combining system.

Background

With the development of laser display technology, the advantages of high brightness and wide color gamut of laser light sources are attracting more and more attention. In the display industry, the requirements of laser televisions and laser projection are increasing, and the display technology that the light source adopts three-color pure laser light becomes the mainstream.

However, in order to increase the brightness of laser projection and laser television under the same laser power, the number of lasers used can be changed, and the requirement of combining multiple light sources is met. And with the development of three primary color lasers and the use of at least three lasers, the requirements of light sources can be met.

At present, there is also a method for integrating three primary colors LD on one laser, but the power of a single laser is limited, and under the current laser development level, the power of multiple lasers is required to meet the requirements of laser television and laser projection; meanwhile, the added laser is used as a light source to emit light in the same direction, the occupied space is too large, the aperture of the lens is too large, and the size of the instrument is increased finally. At present, a lens group and a band-pass filter are used for converging light towards different directions of a light source. However, this method uses many devices, and requires the position accuracy of each lens, and the light combining effect is greatly affected by the process problem.

Disclosure of Invention

The invention aims to provide a reflective laser light combining system, which solves the problems of large occupied space and insufficient laser projection brightness of a lens group and a band-pass filter for completing light combination.

The technical scheme adopted by the invention is as follows:

a reflection type laser light combination system at least comprises reflectors connected to the same bottom surface, and each reflector at least corresponds to a laser light source, and parallel light beams are reflected by light beams of each laser light source flowing through the mirror surface of the reflector.

Preferably, the reflective laser light combining system includes two reflecting mirrors, and the two reflecting mirrors are connected to the same bottom surface.

Preferably, the angle of the splicing included angle of the two reflectors is 30 degrees, and the direction of the laser beam of which the incident ray and the connecting surface form an angle of 60 degrees is adjusted to form an angle of 90 degrees with the connecting surface.

Preferably, the reflective laser light combining system includes three reflectors, and the three reflectors are sequentially spliced end to form a triangular prism structure.

Preferably, the reflective laser light combining system includes at least four reflecting mirrors, and the at least four reflecting mirrors form any one of a regular quadrangle and a regular polygon.

Preferably, the laser light source is a solid laser.

Preferably, the laser light source is a light emitting diode.

As a preferable scheme, the reflective laser light combining system can be used in any mode of selecting 1 to 4.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the system can combine light beams in two directions or a plurality of directions into light beams in the same direction through reflection, and the light beam combining system can be completed only by arranging a corresponding number of reflectors. Each reflector corresponds to the light beam of one light source, and the direction of the incident light beam is changed into a uniform direction under the condition that a specific angle is met.

2. The scheme only needs to use the reflector and splicing the reflector, is very simple in process, can effectively reduce cost, optimizes the structure of the system while reducing the number of light combining optical path devices, avoids loss of accuracy caused by complex process, and better ensures a high-efficiency light combining system.

Drawings

FIG. 1 is a schematic diagram of the present invention combining two beams of light;

FIG. 2 is a schematic diagram of a triple mirror of the present invention;

FIG. 3 is a schematic diagram of the construction of a four-mirror of the present invention;

the labels in the figure are: 1/2/6/7/9/10/11/12, a mirror; 3/8, connecting surface; 4. a first laser light source; 5. a second laser light source.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

as shown in fig. 1 and fig. 2, a reflective laser beam combining system includes at least one reflector connected to a same bottom surface, and at least one laser light source corresponding to each reflector, wherein a light beam of each laser light source passes through a mirror surface of the reflector to reflect a parallel light beam.

In order to complete the convergence of the tubes and provide a simple mode, two reflectors (1 and 2), a connecting surface 3, and a first laser light source 4 and a second laser light source 5 at two different angles are designed, wherein the two reflectors are connected to the connecting surface 3 of the same bottom surface, and when the reflectors form a certain angle with the splicing surface as required, the requirement for changing the direction of the corresponding light beam can be met. The angles of the first laser light source 4 and the second laser light source 5 can be different, and the angles of the two reflectors (1 and 2) can be correspondingly adjusted; compared with a light combination method when two beams of laser are arranged in the same direction, the light combination method has the advantages that the light passing aperture and the system size are effectively reduced, the number and the cost of devices are reduced, the high efficiency and the stability of the system are guaranteed by a simple process, a laser light source is any one of a solid laser or a light emitting diode, various adaptation requirements are met, and the angle correction is as follows: the angle of the splicing included angle of the two reflectors is 30 degrees, the direction of the laser beam of which the included angle between the incident light of the laser light source and the connecting surface is 60 degrees is adjusted to be an included angle of 90 degrees with the connecting surface, and the reflected light of the laser light sources can be integrated.

As shown in fig. 2, the reflective laser beam combining system includes three reflectors (6, 7) and a bottom connecting surface 8, the three reflectors are spliced into a triangular prism structure, so that three beams of laser beams can be synthesized, the three beams of laser beams in different incident directions can be reflected and then spread along the same direction, and the structure of the triangular prism structure is more stable.

As shown in fig. 3, the reflective laser beam combining system includes at least four reflectors (9, 10, 11, 12), and the at least four reflectors form any one of a regular quadrangle or a regular polygon, and the side view of the reflective laser beam combining system formed is in a regular polygon shape, so that four or more laser beams with different incident directions can be reflected and then transmitted along the same direction, and the plurality of reflectors are spliced into a beam combining module as required, so that the beam combining requirement of multiple beams of laser can be met. Each reflector corresponds to a light beam of one light source, and the direction of an incident light beam is changed into a uniform direction when the requirement on a calibration angle is met; the technical scheme only needs to use the reflector and splicing the reflector, so that the method is very simple in process, can effectively reduce cost, optimizes the structure of the system while reducing the number of light combining optical path devices, avoids loss of accuracy caused by complex process, and better ensures a high-efficiency light combining system.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A reflection-type laser light combination system is characterized in that at least one of the reflection mirrors comprises a reflection mirror connected to the same bottom surface, each reflection mirror at least corresponds to one laser light source, and light beams of each laser light source flow through the mirror surface of the reflection mirror to reflect parallel light beams.

2. A reflective laser beam combining system according to claim 1, wherein the reflective laser beam combining system comprises two mirrors, and the two mirrors are connected to the same bottom surface.

3. The reflective laser beam combining system according to claim 2, wherein the angle between the two reflectors is 30 °, and the direction of the laser beam formed by the incident light of the laser source and the connecting surface at 60 ° is adjusted to form an angle of 90 ° with the connecting surface.

4. A reflective laser beam combining system according to claim 1, wherein the reflective laser beam combining system comprises three reflecting mirrors, and the three reflecting mirrors are sequentially spliced end to form a triangular prism structure.

5. The system of claim 1, wherein the reflective laser beam combiner system comprises at least four reflectors, and the at least four reflectors form any one of a regular quadrilateral and a regular polygon.

6. The reflective laser beam combining system of claim 1, wherein the laser source is a solid-state laser.

7. The reflective laser light combining system of claim 1, wherein the laser light source is a light emitting diode.

8. The reflective laser beam combining system of claim 1, wherein any one of the reflective laser beam combining systems of claims 1 to 4 is used.