Low-cost DLP projection light path structure and equipment capable of loading standard interface industrial lens

Abstract

The invention relates to a low-cost DLP projection optical path structure capable of loading a standard interface industrial lens, and the structure comprises an illumination optical path which comprises a light source assembly, an illumination lens, a DMD chip, and a prism group. The illumination optical path further comprises a diffusion sheet which eliminates the influence of the image of the light source assembly and homogenizes the brightness of the light beam. The diffusion sheet is combined with the illumination lens; meanwhile, the light beam convergence degree is controlled; the dodging effect similar to that of a compound eye and an integrating column is achieved; and therefore, the problems of high cost caused by compound eye mold opening, too long integral column and too many lenses are avoided; moreover, the illumination mode of the invention is different from critical illumination, so that the LED is clearly imaged on the DMD; different from Kohler illumination that emergent light is collimated, the light beams are irradiated on the DMD in a slight convergence state, so that clear projection of surface lines of the LED is avoided, the outline of a light spot is rectangular, and compared with a circular outline of Kohler illumination, the use efficiency of illumination is greatly improved.

Description

technical field [0001] The invention relates to the technical field of DLP projection, and more specifically relates to a low-cost DLP projection optical path structure and equipment capable of loading standard interface industrial lenses. Background technique [0002] In order to achieve brightness uniformity, the current uniform light system of the DLP system needs to use a compound eye or an integral column as a light uniform device; the glass compound eye used in an industrial environment is extremely expensive to open a mold, and the mold price is generally more than 300,000, and the integral column Although low, the length is too long, the number of lenses used is too large, and the efficiency is not as good as that of compound eyes; [0003] Considering the effect and volume, the compound eye is still the current mainstream lighting solution. For example, the patent CN110850666A is a solution currently used in this application. The reason is that the price of the opt...

AI Technical Summary

Problems solved by technology

[0002] In order to achieve brightness uniformity, the current uniform light system of the DLP system needs to use a compound eye or an integral column as a light uniform device; the glass compound eye used in an industrial environment is extremely expensive to open a mold, and the mold price is generally more than 300,000, and the integral column Although low, the length is too long, the number of lenses used is too large, and the efficiency is not as good as that of compound eyes;

[0003] Considering the effect and volume, the compound eye is still the current mainstream lighting solution. For example, the patent CN110850666A is a solution currently used in this application. The reason is that the price of the optical machine itself remains high, which is not conducive to mass production

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