2results 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.

A portable stray light elimination multi-spectral fundus camera device comprises an illumination system, an imaging system and an image acquisition device located on the same optical axis; the illumination system comprises a light source, a scattering plate, a light collecting lens, a first polarizing plate, a condensing lens and a beam splitter arranged in sequence; the imaging system comprises a front objective lens, a second polarizing plate and a relay lens arranged in sequence; the first polarizing plate and the second polarizing plate are arranged for vertical polarization; the beam splitter is located between the second polarizing plate and the front objective lens, and the image acquisition device is located outside the front objective lens; the light source emits initial light, which passes through the scattering plate, the light collecting lens, the first polarizing plate and the condensing lens in sequence, reaches the beam splitter, and then reflects to the front objective lens, and then enters the fundus; the reflected light of the fundus reaches the beam splitter through the front objective lens, and then is transmitted to the second polarizing plate, and then enters the image acquisition device through the relay lens. The overall structure of the present invention is simple and the size is small, and the cost is low, which is suitable for promotion.