Variable attenuator of double variable density disc

Abstract

The invention discloses a variable attenuator of a double variable density disc, which comprises a first variable density disc, a second variable density disc, a first servo motor, a second servo motor, a first encoder, a second encoder, a first limit switch, a second limit switch, a first motor shaft and a second motor shaft, wherein a servo control system consisting of the motors and the encoders respectively controls the rotations of two variable density discs with a complementary and symmetric structure, and the current transmissivity of the two variable density discs commonly realizes the quantitative attenuation of incident light beams. The invention provides a complementary and symmetric structure of the double variable density disc, which has the characteristics of continuously attenuating the incident light beams of the traditional variable attenuator, has greatly improved transmissivity segmentation precision and has an obvious advantage that: compared with the variable attenuator of single variable density disc, the variable attenuator of the double variable density disc does not change the energy distribution of the light beams and therefore does not increase the energy non-uniformity of the incident light beams, guarantees the quality of the incident light beams after attenuation and represents special advantages.

Description

technical field [0001] The invention relates to a light beam energy attenuator, which can adjust the incident light beam by changing the transmittance. Background technique [0002] At present, the variable attenuator of the single variable density disk is widely used in illumination and imaging optical systems. The subdivision accuracy of the transmittance of the variable attenuator of the single variable density disk is relatively low. At the same time, because the incident beam has a certain aperture, it will After the incident light passes through the variable attenuator of the single variable density disk, its energy distribution changes, thus limiting the application of the variable attenuator of the single variable density disk. Contents of the invention [0003] In order to solve the technical problems described in the background art, the object of the present invention is to propose a variable attenuator with double variable density disks, which can achieve high-p...

AI Technical Summary

Problems solved by technology

[0002] At present, the variable attenuator of the single variable density disk is widely used in illumination and imaging optical systems. The subdivision accuracy of the transmittance of the variable attenuator of the single variable density disk is relatively low. At the same time, because the incident beam has a certain aperture, it will After the incident light passes through the variable attenuator of the single variable density disk, its energy distribution changes, thus limiting the application of the variable attenuator of the single variable density disk

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