Micromovement actuator used for adjusting mirror surface position of astronomical telescope

Abstract

Provided is a micromovement actuator used for controlling the mirror surface position of an astronomical telescope. One end of the micromovement actuator is in connection with a support mirror surface, and the other end is in connection with the frame of the telescope, wherein the connection point with the support mirror surface and the connection point with the frame of the telescope are connected to form a connection line, and the connection line forms the output shaft of the micromovement actuator. The micromovement actuator is characterized by comprising an elastic structure body and an active central shaft; the elastic structure body is a polygon composed of elastic materials; the active central shaft is vertical with the output shaft of the micromovement actuator, and the base and the end of the active central shaft are respectively in fixed connection with two sides or two angles of the polygon. The micromovement actuator has the characteristics of simple structure and high connection rigidity, employs a multi-set cooperative work mode, and can effectively enhance the coupling stiffness between the mirror surface and the frame, and avoid overconstraint or passive constraint; meanwhile, the micromovement actuator can realize continuous mirror surface movement in adjusting a position, and avoid gaps or backlash; besides, the movement output precision can be under one micrometer. The micromovement actuator can be applied to other fields.

Description

technical field [0001] The invention relates to a precise mirror position adjustment device, in particular to a micro-displacement actuator. It is mainly used in the position adjustment of the optical mirror of the astronomical telescope. The errors accumulated during the processing and installation of the structural parts of the telescope will cause the deviation of the relative position of the optical mirrors in the telescope, and in the spliced ​​mirror active optical system, the adjustment of the relative position between each sub-mirror needs to be promoted by high-precision micro-displacement. moving mechanism. The micro-displacement actuator can also be applied to other forms of structural parts whose positions need to be precisely adjusted, such as the position adjustment of a reflective panel of a radio telescope. Background technique [0002] In the design process of astronomical telescopes, micro-displacement actuators are a commonly used mirror position adjustm...

AI Technical Summary

Problems solved by technology

At present, there are mainly three types of micro-displacement adjustment structures commonly used: 1) the combination of coarse and fine platforms, the fine displacement platform is placed on the coarse displacement platform for precision compensation, and its mechanical mechanism is relatively complicated; 2) mobile drive system , there are two main types of common mobile drive structures: one is based on the "inchworm principle" and the other is based on the "stick-slip effect". In theory, both of them can achieve infinite working strokes. Electric motors, whose motion resolution can reach the nanometer level, but the price of the inchworm motor is extremely expensive; 3) A mechanism with a motion scaling function (commonly referred to as an operational amplifier mechanism) is used between the driver and the actuator. There are two situations: one is to use a piezoelectric driver combined with a motion amplification mechanism. This type of displacement actuator has a small stroke and requires continuous power supply; the other is to use an ordinary motor combined with a motion reduction mechanism, such as my country's LAMOST The micro-displacement actuator of the telescope MB sub-mirror is driven by a stepping motor, and is decelerated by a harmonic reducer and a precision ball screw to achieve a micro-displacement output

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