1results about How to "Eliminate reflected light" patented technology

The utility model discloses a kind of microscopic automatic focusing device and electronic equipment based on laser spot, it is related to automatic focusing field.The microscopic automatic focusing device includes: one or more than two optical rotators, be set in objective lens group or between objective lens group and measured object, for once or multiple rotation polarization direction of all linear polarization detection light received by automatic focusing sensor, to distinguish from polarization direction of all or part objective lens group surface reflected light;First polarizer, set in the front side of automatic focusing sensor, only for eliminating all or part of the reflected light outside the linear polarization detection light.Based on the above setting, the polarization direction of linear polarization detection light is changed by optical rotator, so that it is different from the polarization direction of reflected light directly reflected from objective lens surface to automatic focusing sensor, based on this, all or part of reflected light is eliminated using first polarizer, reduce the stray light generated by internal lens of objective lens group reflection.