A coupling lens system

Abstract

The invention relates to a coupling lens system, and belongs to the technical field of lighting. The coupling lens system comprises a laser light source, a coupling lens and a transmission optical fiber, wherein the coupling lens is arranged between the laser light source and the transmission optical fiber; at least one of a light incoming end and a light outgoing end of the coupling lens has a free-form surface, when the light incoming end or the light outgoing end has a free-form surface and has at least one free-form surface, light emitted by the laser light source at different angles is coupled by the coupling lens, gets into the transmission optical fiber and is converged into a focal line at the central axis of a fiber core. The coupling lens system is applicable to high-power laserlighting, and solves a problem of low coupling efficiency caused by light emitting characteristics of an LED light source; and the light emitted by the light source is coupled into the optical fiber in a mode of the uniform focal line by using the coupling lens with the free-form surface structure, thereby avoiding the fusing caused by excessively high single-point energy in the optical fiber. Inaddition, the system is applicable to short-distance and even long-distance transmission with low cost and high transmission efficiency.

Description

technical field [0001] The invention relates to the technical field of lighting, in particular to a coupling lens system for lighting. Background technique [0002] At present, optical fiber communication technology has basically matured in the field of communication technology, and the application of optical fiber light guide to lighting is a new development direction of optical fiber light guide technology. Fiber-optic light-guiding lighting is a light-guiding lighting method with photoelectric separation. There is no electrical equipment at the output end of fiber-optic light-guiding lighting, so it is also a safe light source in places with fire hazards and explosive gases. Existing fiber optic light guide lighting is widely used in some low-power decorative lighting, signal lights and endoscopes, but there are still many difficulties in the field of high-power lighting that make it difficult to promote on a large scale. [0003] Existing coupling systems used in light ...

AI Technical Summary

Problems solved by technology

To meet the luminous characteristics of LED light sources and improve the coupling efficiency, the diameter of the fiber needs to be increased, and the cost of the fiber will increase exponentially with the increase in diameter

[0005] 2. The surface of the general coupling lens is mostly spherical. The spherical lens can converge light rays from different angles into a focal point, so that the energy can be concentrated on the optical fiber at a single point. If the energy at a single point is too high, the optical fiber is easy to burn.

In addition, the temperature resistance of the material of plastic optical fiber is relatively poor, and plastic optical fiber is more likely to be melted

[0006] 3. It is difficult to deal with the end face of plastic optical fiber. Once the end face angle is deviated or the surface smoothness is not enough, it will cause a large amount of fiber scattering on the end face, and the coupling efficiency is low.

[0007] 4. The transmission loss of plastic optical fiber is too large. The imported optical fiber is about 150dB / km, while the domestic optical fiber is about 250dB / km. Light in the optical fiber cannot be transmitted at short distances with high transmission efficiency and low cost, nor can it be transmitted at long distances. Not to mention satisfying both high transmission efficiency and low cost during long-distance transmission

However, the lens coupling system uses a high-power semiconductor laser fiber coupling system, which generally uses a spherical lens, which does not solve the problem of single-point energy and high-flammable optical fibers caused by spherical lenses converging light sources from various angles at one focus.

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