CN216622866U

CN216622866U - Laser module

Info

Publication number: CN216622866U
Application number: CN202123254210.8U
Authority: CN
Inventors: 不公告发明人
Original assignee: Guangzhou Optical Technology Co ltd
Current assignee: Guangzhou Optical Technology Co ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-05-27
Anticipated expiration: 2031-12-20

Abstract

The utility model relates to a laser module, comprising: the device comprises a laser, a wavelength conversion device for converting the wavelength of light and a biconvex lens arranged between the laser and the wavelength conversion device; the center thickness of the biconvex lens is T, the focal length is f, and f/T is more than or equal to 0.5 and less than or equal to 1.4. According to the utility model, the existing multi-lens is replaced by the biconvex lens, and after light rays of the laser are emitted from the excitation point, the light rays are transmitted to the wavelength conversion device for wavelength conversion and then are emitted out through the folding, collimation, focusing and the like of the biconvex lens. The utility model reduces the number of lenses, has low cost and small size, reduces the assembly difficulty, and ensures the assembly precision, thereby ensuring the illumination effect. In addition, the focal length and the center thickness of the biconvex lens are set to satisfy that f/T is more than or equal to 0.5 and less than or equal to 1.4, so that the feasibility of a processing technology is ensured, and meanwhile, the laser module is shorter, the focusing energy is concentrated, and the conversion efficiency is higher.

Description

Laser module

Technical Field

The utility model relates to the technical field of optics, in particular to a laser module.

Background

The semiconductor laser light source has the characteristics of high response speed, low brightness attenuation, small volume, low energy consumption, long service life and the like, has brightness far higher than that of an LED light source, is a new light source in recent years, and is gradually applied to the field of vehicle illumination. Most of laser module length that have now on the market all is more than 20mm basically, need set up more lens and draw in, collimation, focus etc. to the laser that the laser instrument sent, and not only the system size of laser module is long, and the cost is higher. In addition, because the number of the lenses is large, the precision requirement on the installation position of the lenses is high, and if the installation position of the lenses is not accurate, the laser lighting effect is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome at least one defect (deficiency) of the prior art, and provides a laser module, which is used for solving the problems that most of the existing laser modules need to be provided with more lenses to gather, collimate, focus and the like laser emitted by a laser, the system size of the laser module is long, the cost is high, the requirement on the assembly precision of the lenses is high, and the illumination effect of the laser cannot be ensured.

The technical scheme adopted by the utility model is as follows:

a laser module, comprising: the device comprises a laser, a wavelength conversion device for converting the wavelength of light and a biconvex lens arranged between the laser and the wavelength conversion device; the center thickness of the biconvex lens is T, the focal length is f, and f/T is more than or equal to 0.5 and less than or equal to 1.4.

In one embodiment, the biconvex lens is a biconvex aspheric lens or a biconvex lens with one spherical surface and one aspheric surface.

In one embodiment, the wavelength conversion device comprises a substrate and a phosphor layer coated on the substrate, and the distance from the excitation point of the laser to the side wall of the biconvex lens close to the laser is L₁The distance from the fluorescent powder layer to the side wall of the biconvex lens far away from the laser is L₂And satisfies 0.8. ltoreq. L₂/L₁≤3.2。

In one embodiment, the T, L₁And L₂The total length of (a) is in the range of 3mm to 12 mm; further, the T, L₁And L₂The total length of (a) is in the range of 4mm to 12 mm.

In one embodiment, the lenticular lensThe radius of curvature of the side close to the laser is R₁The radius of curvature of the side of the biconvex lens far away from the laser is R₂And satisfies 0.95. ltoreq. R₂/R₁≤4。

In one embodiment, a light homogenizing diffuser is arranged between the lenticular lens and the wavelength conversion device.

In one embodiment, the refractive index of the biconvex lens is Nd, and satisfies 1.56 Nd 1.85.

In one embodiment, the biconvex lens is a biconvex aspheric lens, and the aspheric depths z on both sides satisfy one of the following equations:

wherein c is 1/R, R is curvature radius, and k is a quadric coefficient; r is height, and β and α are aspheric coefficients.

In one embodiment, the wavelength conversion device further comprises a light receiving lens arranged on the side of the wavelength conversion device far away from the double convex lens.

In one embodiment, the excitation point of the laser, the lenticular lens, the wavelength conversion device and the light-collecting lens are coaxially arranged.

Compared with the prior art, the utility model has the beneficial effects that:

according to the technical scheme, the existing multi-lens is replaced by the biconvex lens, and after light of the laser is emitted from the excitation point, the light is transmitted to the wavelength conversion device to be subjected to wavelength conversion and then is emitted through the folding, collimation, focusing and the like of the biconvex lens. According to the technical scheme, the number of the lenses is reduced, the cost is low, the size is small, the assembly difficulty is reduced, and the assembly precision is guaranteed, so that the lighting effect is guaranteed. In addition, the technical scheme has the advantages that the focal length and the center thickness of the biconvex lens are set to satisfy that f/T is more than or equal to 0.5 and less than or equal to 1.4, so that the feasibility of a processing technology is ensured, the focusing energy is centralized, the conversion efficiency is higher, and the length of the laser module is greatly shortened.

Drawings

Fig. 1 is a schematic optical path diagram of a laser module according to the present invention.

Reference numerals: 10. a laser; 20. a wavelength conversion device; 30. a lenticular lens; 40. a light homogenizing diffuser; 50. a light-collecting lens.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the utility model. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

A laser module as shown in fig. 1, comprising: a laser 10, a wavelength conversion device 20 for converting the wavelength of light, and a lenticular lens 30 disposed between the laser 10 and the wavelength conversion device 20; the center thickness of the biconvex lens 30 is T, the focal length is f, and f/T is more than or equal to 0.5 and less than or equal to 1.4.

In the present embodiment, the conventional multi-lens is replaced with the lenticular lens 30, the light of the laser 10 is emitted from the excitation point, and then the light is transmitted to the wavelength conversion device 20 through the folding, collimating, focusing, and the like of the lenticular lens 30, the wavelength conversion device 20 converts part of the laser light emitted by the laser into the stimulated light with lambertian distribution, and the laser light that is not converted by the wavelength conversion device and the stimulated light are mixed to form illumination light for emission. According to the technical scheme, the number of the lenses is reduced, the cost is low, the size is small, the assembly difficulty is reduced, and the assembly precision is guaranteed, so that the lighting effect is guaranteed. In addition, according to the technical scheme, the focal length and the center thickness of the biconvex lens 30 are set to satisfy that f/T is more than or equal to 0.5 and less than or equal to 1.4, so that the feasibility of a processing technology is ensured, the length of a laser module is shortened, the focusing energy is also ensured to be concentrated, and the conversion efficiency is higher.

The lenticular lens 30 may be a biconvex aspheric lens or a biconvex lens with one spherical surface and one aspheric surface. Specifically, the biconvex lens 30 according to the present embodiment is a biconvex aspheric lens, and the biconvex aspheric lens is a positive focal length lens. In other embodiments, the lenticular lens 30 may be a spherical lens with one surface and an aspherical lens with the other surface

The wavelength conversion device 20 of the present embodiment includes a substrate and a phosphor layer coated on the substrate, and a shortest distance from an excitation point of the laser 10 to a side of the lenticular lens 30 close to the laser 10 is L₁The shortest distance from the phosphor layer to the side of the lenticular lens 30 away from the laser 10 is L₂I.e. the shortest distance from the phosphor layer to the side of the lenticular lens 30 close to the wavelength conversion device 20 is L₂And satisfies 0.8. ltoreq. L₂/L₁3.2 is not more than, thereby better correcting aberration, ensuring focusing energy concentration and simultaneously ensuring the short and handy size of the laser module. Taking biconvex aspheric lens as an example, the shortest distance referred to herein is based on two convex points of the convex surface of the biconvex aspheric lens, L₁The distance L from the excitation point of the laser 10 to the convex surface of the biconvex aspheric lens close to the laser₂The horizontal distance from the fluorescent powder layer to the convex point of the biconvex aspheric lens close to the convex surface of the fluorescent powder layer.

Preferably, said T, L₁And L₂Is in the range of 3mm to 12mm, and further, T, L₁And L₂L of the total length of (2) ranges from 4mm to 12 mm.

The radius of curvature of the biconvex lens 30 of the present embodiment on the side close to the laser 10 is R₁The radius of curvature of the side of the biconvex lens 30 far away from the laser 10 is R₂I.e. the radius of curvature of the lenticular lens 30 on the side close to the wavelength conversion device 20 is R₂And satisfies 0.95. ltoreq. R₂/R₁4 or less, thereby better correcting aberration, ensuring focusing energy concentration and simultaneously having higher conversion efficiency.

In this embodiment, a light homogenizing and diffusing member 40 is disposed between the lenticular lens 30 and the wavelength conversion device 20 for homogenizing laser spots and avoiding the powder burning phenomenon of the wavelength conversion device 20 due to over concentration of laser light. Specifically, the light uniformizing diffuser 40 of the present embodiment is a light uniformizing diffuser.

The refractive index of the biconvex lens 30 in the embodiment is Nd, and Nd is more than or equal to 1.56 and less than or equal to 1.85, so that the light spot effect is ensured.

In addition, the aspheric depth z on both sides of the present embodiment satisfies one of the following equations:

wherein c is 1/R, R is curvature radius, and k is a quadric coefficient; r is height, and β and α are aspheric coefficients. That is, when the aspherical depth on the side close to the laser 10 satisfies the first equation, R is R₁K is the conic coefficient of the side, r is the height of the side, and α is the aspheric coefficient of the side.

The present embodiment further includes a light receiving lens 50 disposed on a side of the wavelength conversion device 20 away from the lenticular lens 30, and configured to focus, receive and emit the laser light converted by the wavelength conversion device 20.

In order to facilitate assembly and make reasonable use of space, and ensure a light spot effect, the excitation point of the laser 10, the lenticular lens 30, the wavelength conversion device 20, and the light-receiving lens 50 are coaxially disposed in this embodiment.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A laser module, comprising: the device comprises a laser, a wavelength conversion device for converting the wavelength of light and a biconvex lens arranged between the laser and the wavelength conversion device; the center thickness of the biconvex lens is T, the focal length is f, and f/T is more than or equal to 0.5 and less than or equal to 1.4.

2. The laser module as claimed in claim 1, wherein the biconvex lens is a biconvex aspheric lens or a biconvex lens with a spherical surface and an aspheric surface.

3. The laser module as claimed in claim 1, wherein the wavelength conversion device comprises a substrate and a phosphor layer coated on the substrate, and the shortest distance from the excitation point of the laser to the side of the lenticular lens close to the laser is L₁The shortest distance from the fluorescent powder layer to the side of the biconvex lens far away from the laser is L₂And satisfies 0.8. ltoreq. L₂/L₁≤3.2。

4. The laser module as claimed in claim 3, wherein the T, L is₁And L₂The total length of (a) is in the range of 3mm to 12 mm.

5. The laser module as recited in claim 1 wherein the radius of curvature of the side of the lenticular lens adjacent the laser is R₁The curvature radius of the side of the biconvex lens far away from the laser is R₂And satisfies 0.95. ltoreq. R₂/R₁≤4。

6. The laser module as claimed in claim 1, wherein a light homogenizing diffuser is disposed between the lenticular lens and the wavelength conversion device.

7. The laser module as claimed in claim 1, wherein the refractive index of the biconvex lens is Nd, and 1.56 Nd ≦ 1.85 is satisfied.

8. The laser module as claimed in claim 1, wherein the biconvex lens is a biconvex aspheric lens, and the aspheric depth z satisfies one of the following equations:

9. The laser module as claimed in any one of claims 1 to 8, further comprising a light-collecting lens disposed on a side of the wavelength conversion device away from the lenticular lens.

10. The laser module as claimed in claim 9, wherein the excitation point of the laser, the biconvex lens, the wavelength conversion device and the light-collecting lens are coaxially disposed.