Light source device

Abstract

The invention provides a light source device, which is characterized by comprising a light source, a reflection element, a polarization beam splitter, a wavelength conversion device and a scattering optical system. A transmission region of the reflection element allows light of a first wave band emitted by the light source to pass through or be transmitted through and then enter the polarization beam splitter, and a reflection region can reflect the light of the first wave band from the polarization beam splitter, so that the light is emitted back to the polarization beam splitter, the light can be reused, and the light emitting efficiency of the light source device is improved. The light source device has the advantages of being high in brightness, small in optical expansion amount, highin color rendering index, long in service life and the like, and can be suitable for systems needing high illumination intensity and small optical expansion amount, such as an entertainment illumination system, a projection system, an automobile illumination system, a medical illumination system, a searchlighting illumination system, a field operation illumination system, a navigation illuminationsystem, and a portable illumination system.

Description

technical field [0001] The invention belongs to the field of lighting, in particular to the field of solid-state light source lighting. The light source device provided by the present invention can be applied to systems that require high light intensity and small etendue, such as entertainment lighting systems, projection systems, automotive lighting systems, medical lighting systems, search lighting systems, field operation lighting systems, Nautical lighting systems, portable lighting systems, etc. Background technique [0002] As an ideal point light source, laser has the advantages of small etendue, long life and no mercury. Using it as a light source to excite the fluorescent body can produce colored light or white light, and at the same time cooperate with the use of optical elements to obtain an ideal light-emitting device with a small etendue. [0003] figure 1 It is a structural schematic diagram of an existing polarization-splitting light source device. Such as...

AI Technical Summary

Problems solved by technology

However, according to common sense of optics, we know that after polarized light is diffusely reflected, it is difficult for the reflected light to fully retain the polarization state of the original incident light. Usually, the reflected light may partially retain the polarization state of the original incident light or completely become unpolarized light.

while in figure 1 In the scheme shown, the reflection of circularly polarized blue light by the reflective diffuser 70 is diffuse reflection, because only in this way can a uniform white light output be obtained, but a considerable part of it will be reflected by the reflective diffuser 70 The final blue light cannot maintain the polarization state of circularly polarized light, and even all the blue light reflected by the reflective diffuser 70 will become unpolarized light, which will cause at least part of the blue light to be unable to pass through the quarter-wave plate 50 Afterwards, it becomes the blue light of S polarized light, so that it cannot be completely emitted from the light source device, which will lead to low luminous efficiency of the entire light source device

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