Light source device and projection system

Abstract

The invention discloses a light source device which comprises an excitation light source, a beam shrinking assembly, a scattering sheet, a dichroic element, a lens group and a wavelength conversion device. The excitation light source adopts a light source array, the beam shrinking assembly comprises a convex lens and a concave lens, the convex lens consists of at least one sub convex lens, and theconcave lens consists of at least one sub concave lens. The total number of the sub-convex lenses and the sub-concave lenses is at least three, so that the excitation light of the excitation light source is shaped by the beam shrinking assembly to form at least two light beams with different angles to be emitted out, each group of light beams sequentially passes through the scattering sheet, thedichroic element and the lens group to form corresponding excitation light spots on the wavelength conversion device, and the excitation light spots are arranged in a straight line. The invention further discloses a projection system. According to the present invention, the excitation light spots formed by the light source device are matched with the rectangular holes of a light guide pipe, when the power of the excitation light is increased, the collection efficiency of the excited light is not influenced while the power density is reduced, and the system efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of laser projection, and in particular relates to a light source device and a projection system. Background technique [0002] Such as figure 1 and figure 2 As shown, the existing laser projection system usually includes an excitation light source 1, a beam shrinker assembly, a diffuser 2, a dichroic element 3, a lens group 4, a wavelength conversion device 5, a converging lens group 6 and a light guide 12. The excitation light source 1 The generated excitation light is successively shaped by the beam shrinker component, scattered by the scattering sheet 2, reflected by the dichroic element 3 and collimated by the lens group 4, and then forms an excitation spot 9 on the wavelength conversion device 5, and the excitation spot 9 excites on the wavelength conversion device 5 The wavelength conversion material generates excited light, which is then converged by the lens group 4, transmitted by the dichroic el...

AI Technical Summary

Problems solved by technology

The beam shrinker assembly is usually composed of a convex lens 7 and a concave lens 8. The excitation spot 9 is distributed in a circular diffuse spot. A rectangular hole 12a is opened on the light guide 12. The aspect ratio of the rectangular hole 12a is 16:9. The excited light source The utilization ratio is determined by the short side of the rectangular hole 12a, figure 2 The middle rectangular frame is the image of the rectangular hole 12a on the wavelength conversion device 5. According to the imaging principle, to allow the excited light to enter the optomechanical system, the excitation spot 9 should be within the rectangular frame. However, when the excitation light power increases , since the size of the excitation spot 9 remains unchanged, the power per unit area of ​​the excitation spot 9 will increase, and the generation efficiency of the excited light will decrease. When the effective stimulated light in the catheter 12 increases, the size of the excitation spot 9 has to be increased, but the existing excitation spot 9 can only be circular. After the size of the excitation spot 9 increases, part of the excitation light is located outside the rectangular frame , causing the stimulated light to be unable to enter the light pipe 12, the system efficiency will decrease

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