light source

Abstract

The invention provides a light source which comprises a wavelength conversion device. The wavelength conversion device comprises a wavelength conversion layer and a substrate and further comprises a function lens which is located on one side of the second face of the wavelength conversion layer and used for collecting emergent light of the wavelength conversion layer. The function lens comprises a first surface which is divided into a first area and a second area. A filtering film is plated on the surface of the second area, and the filtering film reflects exciting light and meanwhile transmits excited light. The residual exciting light emitted from the wavelength conversion layer is emitted to the second area of the first surface, and the shape of the surface of the second area enables the exciting light reflected by the filtering film of the second area to go back to the wavelength conversion layer. The light source further comprises an exciting light source, exciting light emitted by the exciting light source is emitted into the function lens, and the intersection point of the exciting light and the first surface is located in the first area. The exciting light is focused on the surface of the wavelength conversion layer through the function lens and excites the wavelength conversion layer to generate excited light. According to the light source, part of the exciting light emitted from the wavelength conversion layer to the second area of the function lens can be reflected to the wavelength conversion layer by the filtering film and reused, and therefore the efficiency of the light source is obviously improved.

Description

technical field [0001] The invention relates to the field of light sources, in particular to light sources using semiconductor technology. Background technique [0002] At present, light source technology has been applied in many fields, and the most widely used light sources are halogen lamps and fluorescent lamps. The biggest problem with these light sources is insufficient brightness. In recent years, the LED light source has developed rapidly. The blue LED is used to excite the yellow phosphor powder coated on the surface of the LED to generate white light. This light source has begun to be popular in the market. But the problem is that the power of a single LED light source is low, and there is still the problem of insufficient brightness. [0003] In the field of high-brightness light sources, high-pressure mercury lamps and xenon light sources are commonly used. Such light sources rely on ultra-short lamp arcs to have high brightness (energy density), but the proble...

AI Technical Summary

Problems solved by technology

But the problem is that the power of a single LED light source is low, and there is still the problem of insufficient brightness.

[0003] In the field of high-brightness light sources, high-pressure mercury lamps and xenon light sources are commonly used. Such light sources rely on ultra-short lamp arcs to have high brightness (energy density), but the problem is that their lifespan is only about 1000 hours, and the cost of use is very high.

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