Projection system

Abstract

The invention discloses a projection system, which comprises a light source, a light beam reduction module, a light ray reduction module,, a regulation module, a gathering lens group, a fluorescence color wheel and a plurality of optical path conversion elements, wherein the light source is used for giving out parallel light; the light beam reduction module is positioned in the light emergence direction of the light source, comprises a first convex lens and a first concave lens, and is used for reducing the size of light spots of parallel light; the light ray reduction module is positioned between the light source and the gathering lens group; the regulation module is used for regulating the distance between the first lens and the first concave lens so as to regulate the light spot reduction degree of the light beam reduction module; the gathering lens group is used for focusing light rays irradiated onto the gathering lens group; the located plane of the fluorescence color wheel is vertical to the optical axis direction of the gathering lens group; in addition, the light rays gathered by the gathering lens group are irradiated on the fluorescence color wheel; the position of the gathering lens group and the position of the fluorescence color wheel is fixed; the optical path conversion elements are used for gathering the transmission light and reflection light of the fluorescence color wheel into the same light beam. The goals of reducing the regulation difficulty of regulating the size of the light spots irradiated on the fluorescence color wheel and improving the use reliability of a projector are achieved.

Description

technical field [0001] Embodiments of the present invention relate to projection technologies, and in particular, to a projection system. Background technique [0002] When meeting or teaching, a projector is an indispensable tool for a large number of people, such as a meeting or teaching, because it helps to keep a large number of participants in a timely manner. [0003] Projectors generally need to irradiate blue-wavelength light on the phosphor to excite other colors of light, such as yellow light and green light, which are then filtered by the wavelength filter module into red, green and blue three-color light and projected to the DMD chip. , thus forming the image seen by the human eye. [0004] In order for the projector to obtain sufficient imaging brightness, it is often necessary to adjust the size of the light spot irradiated on the phosphor. If the light spot is too small, the number of photons per unit area will be too large to saturate the phosphor, and the i...

AI Technical Summary

Problems solved by technology

[0004] In order for the projector to obtain sufficient imaging brightness, it is often necessary to adjust the size of the light spot irradiated on the phosphor. If the light spot is too small, the number of photons per unit area will be too large to saturate the phosphor, and the imaging brightness of the projector will be insufficient. If the light spot is too large Large, the energy per unit area is too weak, resulting in the weakening of the number of phosphors irradiated on the deep layer of the fluorescent color wheel in the direction of light, so that the number of photons per unit area is too small to make the imaging brightness of the projector insufficient, so it is used in the projector In the past, it was necessary to adjust the size of the light spot irradiated on the fluorescent color wheel so that the projector has sufficient imaging brightness. In the prior art, the position of the fluorescent color wheel is often adjusted to adjust the size of the light spot irradiated on the fluorescent color wheel, but this method There are disadvantages such as tilting and swinging the fluorescent color wheel, which affects the performance of the projector, and because the fluorescent color wheel is close to the adjacent components, it is difficult to adjust

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