CN211260679U

CN211260679U - Diffusion plate for laser lighting

Info

Publication number: CN211260679U
Application number: CN201922456691.7U
Authority: CN
Inventors: 孙涛
Original assignee: WUXI RUITAO PHOTOELECTRIC TECHNOLOGY CO LTD
Current assignee: WUXI RUITAO PHOTOELECTRIC TECHNOLOGY CO LTD
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-08-14
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses a diffuser plate for laser lighting, it is including adding the diffusion layer that has the diffusion particle, wherein, the bottom surface of diffusion layer is provided with the one deck fluorescent layer, just the terminal surface of diffusion layer is provided with one deck optical structure layer, optical structure layer's the outside has optical microstructure with air contact interface. The diffusion plate for laser illumination is convenient to manufacture and low in cost; and through the compounding of fluorescent layer and diffusion layer, make phosphor powder and blue light/ultraviolet laser instrument separation, need not carry out secondary packaging to the laser instrument, reduce the integration degree of difficulty of system, the increase in space is favorable to the heat dissipation of laser instrument and system simultaneously, is favorable to improving the stability of system.

Description

Diffusion plate for laser lighting

Technical Field

The utility model relates to a diffuser plate especially relates to a diffuser plate for laser illumination.

Background

With the rapid development of semiconductor technology, led lighting technology is becoming mature and widely applied to the lighting market. Semiconductor lighting technologies represented by white light LEDs have become important new lighting sources in recent years due to their advantages of high efficiency, energy saving, ultra-long lifetime, environmental protection, safety, and the like. One of the main operating principles of white LEDs is to use an ultraviolet or blue chip to excite the phosphor coated on its surface and to implement white light by a suitable light mixing technique. Because the packaging size is smaller, the temperature of the chip is high in a large-current state, and the phenomenon that the luminous efficiency suddenly drops can occur along with the increase of the current density of the blue LED chip. Compared with the existing LED illumination light source, the laser illumination light source has the advantages of high power, high brightness, intelligent control and the like, and has wide market prospect.

Generally, laser has good monochromaticity and narrow spectrum, and a white light source is required for single-purpose illumination application. Laser illumination sources typically use 2 ways to obtain a white light source. One is the mixing of 3 primary color laser (red, green and blue) to generate white light, and the other is the excitation of fluorescent powder by blue or ultraviolet laser to generate a white light source. The method of generating white light by using fluorescent powder is similar to led packaging technology due to the relative simple structure, and is currently the main direction of research and application. The method for generating the white light source by exciting the fluorescent powder by the blue light or ultraviolet laser semiconductor Laser (LD) has higher requirement on the working temperature, the spectrum output by the LD and the light power output can be influenced by the temperature change, and meanwhile, because the LD outputs coherent light, the direct application of the LD to illumination can generate interference light spots. The high-power semiconductor laser can generate larger heat when working, and can generate larger heat when the blue light or ultraviolet laser excites the fluorescent powder.

Therefore, the LD and the phosphor plate are usually separated by applying phosphor to a single substrate material to form the phosphor plate, which increases the complexity of the optical system and increases the difficulty and cost of packaging.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a diffuser plate for laser illumination to there is the complicated and with high costs problem of optical system in the laser illumination light source among the solution prior art.

To achieve the purpose, the utility model adopts the following technical proposal:

the diffusion plate for laser illumination comprises a diffusion layer added with diffusion particles, wherein a fluorescent layer is arranged on the bottom surface of the diffusion layer, an optical structure layer is arranged on the end face of the diffusion layer, and an optical microstructure is arranged on the contact interface between the outer side of the optical structure layer and air.

Particularly, the thickness of the fluorescent layer is 10um to 500 um.

In particular, the thickness of the diffusion layer is 100um to 5 mm.

In particular, the optical microstructure is any one of a hemispherical structure, a prismatic structure, a pyramidal structure, or a conical structure.

In particular, the diffusion particles in the diffusion layer have a particle size of 0.5 to 50 um.

The beneficial effects of the utility model are that, compare with prior art the diffuser plate for laser illumination has following advantage:

1) by adopting the structure of the three functional layers, the functional layers of the diffusion layer can be produced by one-time calendering and extruding through a multi-layer coextrusion process, the process is simple, and the cost is low;

2) through the composition of the fluorescent layer and the diffusion layer, the fluorescent powder is separated from the blue light/ultraviolet laser, the laser does not need to be packaged for the second time, the integration difficulty of the system is reduced, and meanwhile, the increase of the space is beneficial to the heat dissipation of the laser and the system and the improvement of the stability of the system;

3) the fluorescent layer has larger area and can bear the input of high-power laser, thereby avoiding the problems of overhigh temperature and aging of colloid of the fluorescent sheet when the conventional laser bombards the small fluorescent sheet to generate white light, and leading the high-energy laser to generate high-energy white light illumination to be possible. The diffusion layer can fully mix the fluorescent light and the blue light, the uniformity of the white light is guaranteed, meanwhile, the diffusion layer and the optical structure layer can reflect part of the blue light penetrating through the fluorescent layer back to the fluorescent layer for the second time, the absorption of the fluorescent layer to the blue light/ultraviolet laser is increased, and the thickness of the fluorescent layer or the using amount of the fluorescent powder can be reduced so as to save the cost;

4) the diffusion layer and the optical structure layer can better eliminate the coherence of fluorescence and blue/ultraviolet laser, so that the light source is closer to the lighting effect of the traditional natural light.

Drawings

Fig. 1 is a schematic structural view of a diffusion plate for laser illumination according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating light diffusion of a diffusion plate for laser lighting according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, in the present embodiment, a diffusion plate for laser illumination has three functional layer structures, which includes a diffusion layer 1, a fluorescent layer 2 disposed on a bottom surface of the diffusion layer 1, and an optical structure layer 3 disposed on an end surface of the diffusion layer 1.

Wherein, the thickness of the fluorescent layer 2 is 10 um-500 um, and the material of the layer is the blend of transparent optical material (glass, PMMA, PS, polycarbonate, etc.) and fluorescent powder (such as YAG powder). The fluorescent powder can absorb blue light or ultraviolet light to emit long yellow light and red light, white light can be obtained after the fluorescent light and the blue light are blended, preferably, the fluorescent layer is made of a polycarbonate and YAG fluorescent powder blend, the thickness is 100 mu m, the fluorescent powder has an absorption peak between 420nm and 460nm, and can emit fluorescent light between 480nm and 780 nm.

The diffusion layer 1 has a thickness of 100um to 5mm and is made of a transparent optical material (glass, PMMA, PS, polycarbonate, etc.) to which diffusion particles are added. The refractive index of the diffusion particles is different from that of the transparent optical material main body, and the particle size is between 0.5um and 50 um. The diffusion layer can better mix the fluorescent light emitted by the fluorescent layer with the transmitted blue light to obtain more pure white light, and simultaneously, the light is diffused as much as possible to form uniform surface light emission. Preferably: the diffusion layer 1 is a polycarbonate material to which PMMA diffusion particles (particle diameter of 2um) are added, and the content of the added PMMA diffusion particles is 1.5% by weight. The diffusion layer thickness is 800 um.

The optical structure layer 3 is made of transparent optical materials (glass, PMMA, PS, polycarbonate, etc.), an interface between the outer side and the air has an optical microstructure, and the optical microstructure can be any one of a hemispherical structure, a prism structure, a pyramid structure or a conical structure, and plays a role in further diffusing the light transmitted from the diffusion layer 1 and controlling the distribution and output angle of the output light. Preferably: optical structure layer 3 is transparent polycarbonate material, and thickness is 200um, and surface microstructure is hemisphere structure, diameter 100um, height 50 um.

In practical application, 450nm blue laser 4 output by a blue Laser (LD) is transmitted to the diffusion layer 1 and then enters the fluorescent layer 2, most of the blue light is absorbed by YAG phosphor in the fluorescent layer 2, the emitted fluorescent light enters the diffusion layer 1, and the fluorescent light and the rest of the blue light in the diffusion layer 1 are reflected and refracted for multiple times by diffusion particles and are fully blended to generate white light 5. The white light is further homogenized in the optical structure layer and then output.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. The diffusion plate for laser illumination comprises a diffusion layer added with diffusion particles, and is characterized in that a fluorescent layer is arranged on the bottom surface of the diffusion layer, an optical structure layer is arranged on the end face of the diffusion layer, and an optical microstructure is arranged on the contact interface between the outer side of the optical structure layer and air.

2. The diffuser plate for laser lighting according to claim 1, wherein the thickness of the fluorescent layer is 10 to 500 um.

3. The diffuser plate for laser lighting according to claim 1, wherein the thickness of the diffuser layer is 100um to 5 mm.

4. The diffusion plate for laser illumination according to claim 1, wherein the optical microstructure is any one of a hemispherical structure, a prism structure, a pyramid structure, or a conical structure.

5. The diffuser plate for laser lighting according to claim 1, wherein the diameter of the diffusing particles in the diffuser layer is 0.5 to 50 um.