The working principle of laser star projector
In recent years, projectors that project images on various projection surfaces such as screens have become popular. Projectors generally use bulb light sources. However, the life span of the bulb light source is relatively short. In addition, the color reproduction area of the bulb light source is limited. In addition, the bulb light source has disadvantages such as larger light source area and lower light utilization efficiency. In order to solve these problems, try to use a laser light source as the light source of the projector. Compared with the bulb light source, the laser light source has a longer life and strong directivity. Therefore, the laser light source can easily achieve high light utilization efficiency. In addition, the laser light source has monochromaticity, so a larger color reproduction area can be realized. Therefore, a projector using a laser light source can display vivid images.
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The laser projector 100 includes a laser light source 110, a spatial light modulation element 120, a projection lens 130, a pupil homogenization element 140 that uniformizes the light intensity distribution of the exit pupil 131 of the projection lens 130, and a beam that shapes the beam shape of the Laser pointer beam. Component 160. The pupil uniforming element 140 has an effective surface on which the first element lens 142 is laid. In addition, the beam element 160 has an effective surface on which the second element lens 162 is laid. Therefore, the laser projector 100 can not only appropriately uniformize the light intensity distribution of the exit pupil 131 of the projection lens 130, but also uniformize the light intensity distribution of the display surface 220. In addition, the laser projector 100 can realize the uniformity of the light intensity distribution and the light quantity distribution without generating zero-order light components. Therefore, there is no part where the light intensity is excessively increased on the retina R of the eye E of the viewer looking into the projection lens 130.
2021-09-24 11:17:42
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