阅读说明：本技术 高显色指数及色温可调的高光通量白光激光照明装置 (High-color-rendering-index and color-temperature-adjustable high-luminous-flux white-light laser lighting device ) 是由 刘喆 吴晨昱 张韵 于 2020-05-22 设计创作，主要内容包括：一种白光激光照明装置,包括激光模块、激光合束系统和荧光转换模块,其中,激光模块包括至少一颗红光激光二极管与至少一颗蓝光激光二极管,其发出的光束通过激光合束系统进行合束混光后耦合进光纤中,混合激光经光纤传输后入射到封装在多元件组合套筒内的荧光转换模块上。本发明采用红光激光器作为弥补红光光谱缺失的手段,可以有效避免因红光荧光材料发生荧光饱和现象而带来的稳定性问题,实现高光通量白光显色指数的提升以及色温的调整,具有广泛的应用前景。(A white light laser lighting device comprises a laser module, a laser beam combining system and a fluorescence conversion module, wherein the laser module comprises at least one red light laser diode and at least one blue light laser diode, light beams emitted by the laser module are combined and mixed by the laser beam combining system and then coupled into an optical fiber, and the mixed laser is transmitted by the optical fiber and then is incident on the fluorescence conversion module packaged in a multi-element combined sleeve. The invention adopts the red laser as a means for compensating the red light spectrum deficiency, can effectively avoid the stability problem caused by the fluorescence saturation phenomenon of the red light fluorescent material, realizes the improvement of the high luminous flux white light color rendering index and the adjustment of the color temperature, and has wide application prospect.)

1. A white light laser lighting device is characterized by comprising a laser module, a laser beam combining system and a fluorescence conversion module, wherein the laser module comprises at least one red light laser diode and at least one blue light laser diode, light beams emitted by the laser module are combined and mixed by the laser beam combining system and then coupled into optical fibers, and the mixed laser is transmitted by the optical fibers and then is incident on the fluorescence conversion module packaged in a multi-element combined sleeve.

2. The lighting arrangement of claim 1, wherein the blue laser diode and the red laser diode are mounted on a heat sink for increasing the heat dissipation capability of the laser diodes and controlling the operating temperature of the laser diodes to achieve high power stable laser output.

3. The illumination device as claimed in claim 1, wherein the illumination device comprises at least one blue laser diode and at least one red laser diode packaged in a TO package, and the laser bands thereof are blue light (wavelength 440-455nm) and red light (wavelength 625-650 nm), respectively.

4. A lighting device as recited in claim 1, wherein a single said blue laser diode is capable of achieving a blue output of greater than 2 watts and a single said red laser diode is capable of achieving a red output of greater than 0.8 watts.

5. The illumination device of claim 1, wherein two independent circuits are used to supply power to the blue laser diode and the red laser diode, respectively, to achieve independent adjustment of the two-color laser power.

6. The illumination device as claimed in claim 1, wherein the illumination device encapsulates the plurality of blue and red laser diodes and the laser beam combining system by using a metal housing, and the metal housing is made of aluminum, copper or alloys thereof.

7. The illumination device as recited in claim 1, wherein the laser beam combining system combines the laser beams in a manner selected from the group consisting of beam collimation, spatial combination, beam expansion shaping, and fiber coupling.

8. The illumination device as claimed in claim 1, wherein the mixed laser is transmitted through an optical fiber and then exits at an optical fiber port, and the optical fiber port is installed in the multi-element combination sleeve through a conversion device, so that the vertical incidence and the front-back adjustment of the position of the light beam are realized.

9. The illumination device of claim 1, wherein the multi-element combination sleeve is capable of accommodating a combination of fluorescent material and laser exit ports, and the position of the elements mounted within the sleeve can be adjusted through either end of the sleeve.

10. The lighting device according to claim 1, wherein the fluorescent material is mounted on a multi-element combined sleeve with adjustable distance, and the distance between the fluorescent material and the laser light emitting end is adjusted according to the use requirement;

the fluorescent material can convert received blue light with the wavelength of 440nm-470nm into yellow green light with the wavelength of 520nm-560nm, and the size is as follows: (5-20mm) × (5-20 mm).

Technical Field

The invention relates to the technical field of laser lighting, in particular to a device for improving the color rendering index of a high-luminous-flux fluorescence conversion laser lighting module and realizing adjustable color temperature by adopting a red laser.

Background

Laser lighting, as a complement to LED lighting, has many advantages: (1) after the laser is radiated, the phenomenon of sudden efficiency drop does not exist; (2) near monochromaticity; (3) the volume is smaller, the luminance is higher.

The blue laser is used for irradiating yellow fluorescent powder, which is an important way for synthesizing white light, and the important performance indexes of the laser illumination at present comprise luminous flux, color rendering index, color temperature and the like. For example, automotive manufacturers aim to improve road safety by providing drivers with sufficient field of view for different driving conditions in a compact housing, which undoubtedly requires a high-flux lighting module. Color rendering index and color temperature are key issues related to lighting conditions, as studies have shown that inappropriate lighting conditions can disrupt the chemical reactions of the human body and cause detrimental health effects. Various methods have been implemented to improve the color rendering index and adjust the color temperature, such as YAG: the Ce phosphor is mixed with the red phosphor. These red phosphors can make up for the deficiency of red light, thereby optimizing the spectral composition and improving the color rendering index and color temperature. However, due to thermal or chemical instability of red fluorescent materials under high light injection, methods of improving color rendering index and reducing color temperature have not been studied when considering white light sources based on high-flux LD.

Disclosure of Invention

Accordingly, the present invention is directed to a high luminous flux white laser illumination device with high color rendering index and adjustable color temperature, which is designed to solve at least one of the above problems.

In order to achieve the above object, as an aspect of the present invention, a white light laser lighting device is provided, which is characterized in that the white light laser lighting device includes a laser module, a laser beam combining system and a fluorescence conversion module, wherein the laser module includes at least one red laser diode and at least one blue laser diode, light beams emitted by the laser module are combined and mixed by the laser beam combining system and then coupled into an optical fiber, and the mixed laser is transmitted through the optical fiber and then incident on the fluorescence conversion module encapsulated in a multi-component combined sleeve.

The blue laser diode and the red laser diode are arranged on the radiating fin and used for improving the radiating capacity of the laser diode and controlling the operating temperature of the laser diode so as to realize high-power stable laser output.

The lighting device comprises at least one blue laser diode and at least one red laser diode, the packaging form of the lighting device is TO packaging, and the laser bands of the lighting device are blue light (with the wavelength of 440-455nm) and red light (with the wavelength of 625nm-650nm) respectively.

The single blue laser diode can output blue light with power of more than 2 watts, and the single red laser diode can output red light with power of 0.8 watt or more.

The lighting device adopts two independent circuits to respectively supply power to the blue laser diode and the red laser diode so as to realize independent adjustment of the power of the bicolor laser.

The lighting device adopts a metal shell to package a plurality of blue light and red light laser diodes and a laser beam combining system, and the metal shell is made of aluminum, copper and alloy materials thereof.

The laser beam combining system is used for carrying out collimation and beam combination on laser beams, and the beam combination mode is beam collimation, spatial beam combination, beam expansion shaping or optical fiber coupling.

The mixed laser is transmitted through the optical fiber and then is emitted from the optical fiber port, and the optical fiber port of the mixed laser is installed in the multi-element combined sleeve through the conversion device, so that the vertical incidence of the light beam is realized, and the position of the light beam can be adjusted back and forth.

Wherein the multi-element combination sleeve is capable of accommodating a combination of fluorescent material and laser exit ports, and the position of the elements mounted within the sleeve can be adjusted through either end of the sleeve.

The fluorescent material is arranged on the multi-element combined sleeve with adjustable distance, and the distance between the fluorescent material and the laser light emitting end is adjusted according to the use requirement;

the fluorescent material can convert received blue light with the wavelength of 440nm-470nm into yellow green light with the wavelength of 520nm-560nm, and the size is as follows: (5-20mm) × (5-20 mm).

Based on the technical scheme, compared with the prior art, the white light laser lighting device disclosed by the invention at least has one of the following beneficial effects:

1. the laser module part and the fluorescence conversion part are separated by adopting a mode of transmitting laser by optical fibers, so that the flexibility of the device is greatly improved. The laser module part comprises a plurality of blue laser diodes and a plurality of red laser diodes, wherein the plurality of blue laser diodes provide high-power blue light to excite yellow fluorescent materials, and the plurality of red laser diodes provide adjustable-power red light to improve the color rendering index of the laser module and realize the adjustment of color temperature.

2. The beam collimation module is used for combining and outputting a plurality of laser beams, and the optical design is used for expanding the mixed beam so as to adjust the divergence angle of the mixed beam.

3. The laser part is packaged by the metal shell, so that the laser can be protected from being damaged by the environment, and the heat dissipation capacity of the laser module is improved.

4. The fluorescent material used for the fluorescence converting portion is a fluorescent material having high thermal conductivity and good light scattering ability, such as a fluorescent ceramic or the like. The fluorescent material has high heat conductivity, can bear high-power laser, can convert blue light into yellow light after absorbing the blue light, is not easy to saturate under the power density of the high-power laser, can ensure that white light with high luminous flux is obtained, and has good scattering capability, so that the color angle uniformity of light beams can be improved.

5. The fluorescent sheet and the laser light-emitting port are packaged through the multi-element combined sleeve, the distance between the fluorescent sheet and the light-emitting end can be adjusted, the size of a light spot irradiated on a fluorescent material can be controlled by matching with a light beam divergence angle, power matching of laser and fluorescent ceramic is achieved, and the problem of thermal quenching of the fluorescent material caused by heat gathering is avoided.

6. The invention adopts the red laser as a means for compensating the red light spectrum deficiency, can effectively avoid the stability problem caused by the fluorescence saturation phenomenon of the red light fluorescent material, realizes the improvement of the high luminous flux white light color rendering index and the adjustment of the color temperature, and has wide application prospect.

Drawings

FIG. 1 is a schematic structural diagram of a laser lighting device using multi-fiber coupling according to the present invention;

FIG. 2 is a schematic structural diagram of a laser lighting device using spatial beam combination according to the present invention;

FIG. 3 is a schematic of the spectra obtained in the present invention;

FIG. 4 is a graph showing the relationship between the color rendering index and the proportion of red laser added, obtained in the present invention;

FIG. 5 is a graph showing the relationship between the color temperature and the added red laser light obtained in the present invention.

In the above figures, the reference numerals have the following meanings:

1. a red light laser diode; 2. a blue laser diode; 3.1, a metal packaging shell;

3.2, metal radiating fins; 4.1, coupling and combining optical fibers; 4.2, spatial beam combination;

5. optical fiber transmission; 6. a fluorescent ceramic sheet; 7. a multi-element composite sleeve.

Detailed Description

The transmission type high-power laser lighting device provided by the invention considers the spectral characteristics of blue light excited yellow fluorescent ceramic and the light emitting characteristics of a laser diode from the viewpoint of improving luminous flux and color quality, solves the problems of low color rendering index and high color temperature in the conventional high-power laser lighting module, and realizes high-power laser white light lighting with wide application prospect. On one hand, the invention adopts a plurality of blue laser diodes and a fluorescent conversion material which can bear high-power laser input to realize high-luminous-flux laser white light illumination, and on the other hand, the invention adopts a red laser to make up the deficiency of a red light wave band in laser illumination, thereby improving the color rendering index of the laser illumination module and realizing the adjustment of color temperature.

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.