| 摘要(英) |
This paper is a lens design for analyzing and correcting the heat of a four-megapixel DLP projector at an ambient temperature of 10℃ to 80℃. It is composed of 14 glass lenses with a focal length of 24.06 mm, F/# is 1.71, projection distance of 7.2 meters, projection screen size of 200 inches, and TV distortion, lateral chromatic aberration, relative illumination for the analysis and discussion.
In this paper, we use TI DLP660TE 0.66" DMD. Considering the vertical DMD offset 100%, the maximum image height is 11.038 mm. In the process of designing the athermalization, the design of the optical system at room temperature (22℃) is used as the starting point. The proper lens material is selected and the material of the lens barrel is changed from the metal material aluminum to the plastic material PMMA to achieve the effect of eliminating heat difference. The image quality of the lens at the ambient temperature of 10℃ to 80℃ has a maximum MTF (93lp/mm) is 0.613; the maximum absolute value of the transverse chromatic aberration is 1.390 μm, and the minimum value is 0.782 μm; The maximum optical distortion is 0.14670%; the maximum TV distortion is 0.06768%; the relative is 93.95%.
This optical system is base on a front projection system, the human eye observes screen image, and the human eye resolving power at least 1′, whether the human eye can interpret the horizontal, vertical linear distortion and lateral color of the screen, the resolving power must be less than 1′. The minimum distance between the human eye and the screen is 250 mm (bright distance), the maximum horizontal resolving power is 0.089523′; the maximum vertical resolving power is 0.070716′; the maximum lateral color resolving power is 0.019114′. |
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