CN210568181U

CN210568181U - Laser light-emitting device

Info

Publication number: CN210568181U
Application number: CN201921473764.7U
Authority: CN
Inventors: 张航; 陆建东; 马慧玲; 葛燕妮; 朱瓒; 陈利春
Original assignee: Zhejiang Guangta Energy Saving Technology Co ltd
Current assignee: Zhejiang Guangta Safety Technology Co., Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-05-19
Anticipated expiration: 2029-09-06

Abstract

A laser light emitting device belongs to the technical field of illumination. A laser light emitting device comprises a laser light source, a transmission optical fiber with an optical fiber light emitting head, and a diffusion lens; the laser emitted by the laser source is emitted out through the optical fiber light-emitting head of the transmission optical fiber and enters the diffusion lens which is spaced from the optical fiber light-emitting head by a certain distance; the light inlet end of the diffusion lens is an incident cavity with a free-form surface on the inner wall, and the light outlet end of the diffusion lens is an emergent plane. The utility model discloses realize great angle illumination to light energy redistribution, reduce space optical power density, be applicable to special occasions such as inflammable and explosive, chemical plant.

Description

Laser light-emitting device

Technical Field

The utility model relates to the field of lighting technology, especially, relate to a laser light-emitting device.

Background

The light loss of the LED light source is too large, and the farther the light emitted by the LED light source is, the larger the loss is, so that the light cannot be effectively converged. And the range of the LED light source is short, and the irradiation angle is limited, usually below 120 degrees. In addition, the LED light source has large power consumption. Therefore, the laser light source can be used for long-distance irradiation, and the laser light source has stable overall shape and low power consumption.

The light irradiated by the laser light source is collimated light, so that the irradiation area is small and the energy is concentrated. The temperature of the laser light-emitting end is high, and the laser power is easy to attenuate. Therefore, the problem of how to diffuse the small-angle laser and reduce the temperature of the light-emitting end so as to provide long service life, high light efficiency, long radiation path and large-angle illumination needs to be solved.

The diffusion lens is a key device in the fields of illumination and the like, is widely applied to the backlight field of flat lamps, televisions, street lamps and the like, disperses light rays emitted by a light source, plays a role in expanding a beam angle, and thus achieves the purpose of changing the illumination area and the illumination value of an illuminated surface. The existing diffusion lens is mainly applied to an LED lamp, and the LED lamp has a large light-emitting angle and a small diffusion lens effect, so that the general structure is simple, and the diffusion lens is mainly used for primary light distribution of a chip.

Utility model CN201520933480.7 discloses a lighting device based on laser light source, and specifically discloses that the lighting device comprises a laser light source which is arranged at the front end of a diffusion lens, the laser light source comprises a driving circuit board and a laser emitting head, the laser emitting head emits laser light and is injected into the diffusion lens; a diffusion lens for diffusing the incident laser light into a uniform circular beam; and the fluorescent powder layer is arranged at the rear end of the diffusion lens and is used for realizing frequency spectrum change of the passing laser and forming normal illumination light. The lighting device adopts the diffusion lens to diffuse the small-angle laser, thereby not only ensuring long light source path and low power consumption, but also providing light-emitting illumination with larger angle. However, the lighting device integrates devices such as a power supply and a circuit board into one device, has potential power utilization hazards, and cannot be applied to special occasions such as flammable and explosive plants and chemical plants.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that prior art exists, provided one kind and realized great angle illumination to light energy redistribution, be applicable to the laser light-emitting device of special occasions such as inflammable and explosive, chemical industry.

The utility model discloses a can realize through following technical scheme:

the utility model provides a laser light-emitting device, which comprises a laser light source, a transmission optical fiber with an optical fiber light-emitting head and a diffusion lens; the laser emitted by the laser source is emitted out through the optical fiber light-emitting head of the transmission optical fiber and enters the diffusion lens which is spaced from the optical fiber light-emitting head by a certain distance; the light inlet end of the diffusion lens is an incident cavity with a free-form surface on the inner wall, and the light outlet end of the diffusion lens is an emergent plane.

The utility model discloses laser light-emitting device replaces LED, effectively improves the low scheduling problem of light efficiency. And the laser light source and the light emitting part are of a separated structure, so that the laser light source can be applied to special occasions such as flammable and explosive factories and the like. The device can realize large-angle illumination after adding the diffusion lens at the light-emitting end of the optical fiber.

Preferably, the device further comprises a packaging structure, wherein the optical fiber light-emitting head of the transmission optical fiber and the diffusion lens are packaged in the packaging structure; the emergent plane of the diffusion lens is flush with or concave inwards to the surface of the packaging structure.

Preferably, the diffusion lens is an inverted circular truncated cone with an inwardly concave bottom surface; the sunken part of the inverted round table is an incident cavity; the top surface of the inverted circular truncated cone is an emergent plane.

Preferably, the bottom surface of the inverted round table is a circular ring surface; the free-form surface and the rounded frustum side surface are connected with the torus.

Preferably, the inner surface of the encapsulation structure is coated with a reflective film or coating.

Preferably, the side surface of the diffusion lens, the torus, is coated with a reflective film.

Preferably, the distance between the optical fiber light emitting head and the diffusion lens is 2mm-5 mm.

Preferably, the diffusion lens is a silica gel diffusion lens or a glass diffusion lens.

Preferably, the laser light source is one of a solid laser, a gas laser, a semiconductor laser, and a fiber laser.

The utility model discloses following beneficial effect has:

the utility model relates to a laser light-emitting device replaces LED, effectively improves the low scheduling problem of light efficiency:

1. the divergence angle of the laser emitted from the end face of the optical fiber is 30 degrees, and the emission angle of the laser is 120-160 degrees after the diffusion lens is added at the light-emitting end of the optical fiber.

2. The laser energy is dispersed by the light diffusing lens to reduce the power density and the destructiveness of the laser light is reduced.

3. Compared with a laser device without a lens for emitting light, the temperature of the laser light emitting device passing through the diffusion lens is obviously reduced.

4. Lasers incorporating a diffusing lens will dominate the lighting market.

Drawings

Fig. 1 is a schematic structural view of a laser light emitting device of the present invention;

FIG. 2 is a schematic bottom view of the diffuser lens of FIG. 1;

fig. 3 is a schematic top view of the diffusion lens of fig. 2.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Referring to fig. 1, the present invention relates to a laser light emitting device, which includes a laser light source 3, a transmission fiber 2 with a fiber light emitting head 10, and a diffusion lens 1. The laser light emitted from the laser light source 3 is emitted through a fiber light-emitting head 10 of a transmission fiber 2, and enters a diffusion lens 1 spaced apart from the fiber light-emitting head 10 by a predetermined distance. The light inlet end of the diffusion lens 1 is an incident cavity 4 with a free-form surface 5 on the inner wall, and the light outlet end of the diffusion lens 1 is an emergent plane.

The spacing distance between the optical fiber light emitting head and the diffusion lens is 2mm-5 mm.

The laser light source is one of a solid laser, a gas laser, a semiconductor laser and a fiber laser.

The optical fiber light-emitting head 10 protects the surface of the tail end of the transmission optical fiber from being damaged, and simultaneously performs light alignment to emit light to the diffusion lens.

The laser light-emitting device further comprises a packaging structure 7. The optical fiber head 10 of the transmission optical fiber 2 and the diffusion lens 1 are packaged in the packaging structure. The emergent plane of the diffusion lens 1 is flush with or concave inwards to the surface of the packaging structure. The packaging structure can fix the transmission optical fiber 2 and the diffusion lens 1, and prevents the position deviation of laser and the optical fiber from influencing the diffusion effect. Meanwhile, the heat dissipation capability of the device is improved, the reflection performance of stray light is improved, the transmission optical fiber and the diffusion lens are protected, and damage is reduced.

As shown in fig. 2 and 3, the diffusion lens is an inverted truncated cone with an inwardly concave bottom surface. The sunken part of the inverted round table is an incident cavity 4, and the top surface of the inverted round table is an emergent plane. The bottom surface of the inverted round table is an annular surface 9; the free-form surface 5 and the rounded-off-cone-side surface are connected to the torus 9. The exit surface is a circular plane. And the side surface and the circular ring surface of the diffusion lens are coated with a reflecting film for reflecting incident light so that laser light is emitted from the top circular plane. In addition, the inner surface of the packaging structure is coated with a reflective film.

The diffusion lens is manufactured by injection molding of a silica gel material or a glass material, and the silica gel or the glass material is more wear-resistant and high-temperature resistant than the existing plastic lens material. When the diffusion lens is a silica gel diffusion lens, the high temperature resistant effect is achieved. When the diffusion lens is a glass diffusion lens, the light transmittance can be as high as 97%.

The diffusion lens is designed as follows. Firstly, establishing a mapping relation equation system related to the optical surface shape according to the target beam space angle and the laser light source characteristics:

wherein QUOTE

As light distribution curves of light sources, QUOTE

Representing a spatial angular parameter, QUOTE, of the light-emitting hemisphere of the light source

For a targeted angular distribution, QUOTE

Determining the direction, QUOTE, of the target ray in space

Representing optical operators, QUOTE

Respectively representing a refractive index and a free-form surface; QUOTE

Representing the mapping relation between the target energy distribution and the light source light distribution curve and meeting QUOTE

Numerical aperture relationship and satisfies the constraint of energy conservation relationship:

。

and secondly, solving the equation set to obtain a numerical solution of the free-form surface, and obtaining the free-form surface by a polynomial interpolation method.

After the optical surface shape is obtained, the structures shown in fig. 2 and 3 are obtained through curved surface filling modeling.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. A laser light emitting device is characterized by comprising a laser light source, a transmission optical fiber with an optical fiber light emitting head and a diffusion lens; the laser emitted by the laser source is emitted out through the optical fiber light-emitting head of the transmission optical fiber and enters the diffusion lens which is spaced from the optical fiber light-emitting head by a certain distance; the light inlet end of the diffusion lens is an incident cavity with a free-form surface on the inner wall, and the light outlet end of the diffusion lens is an emergent plane.

2. The laser light extraction device according to claim 1, further comprising a packaging structure, wherein the optical fiber light extraction head and the diffusion lens of the transmission optical fiber are packaged in the packaging structure; the emergent plane of the diffusion lens is flush with or concave inwards to the surface of the packaging structure.

3. The laser light extraction device of claim 1, wherein the diffusion lens is a rounded frustum with an inwardly concave bottom surface; the sunken part of the inverted round table is an incident cavity; the top surface of the inverted circular truncated cone is an emergent plane.

4. The laser light emitting device according to claim 3, wherein the bottom surface of the inverted circular truncated cone is a torus; the free-form surface and the rounded frustum side surface are connected with the torus.

5. The device of claim 4, wherein the side surface of the diffuser lens, the torus, is coated with a reflective film.

6. The laser light extraction device of claim 1, wherein the separation distance between the optical fiber light extraction head and the diffusion lens is 2-5 mm.

7. The device of claim 2, wherein the inner surface of the package structure is coated with a reflective film or a reflective coating.

8. The device of claim 1, wherein the diffuser lens is a silica gel diffuser lens or a glass diffuser lens.

9. The laser light emitting device according to claim 1, wherein the laser light source is one of a solid laser, a gas laser, a semiconductor laser, and a fiber laser.