High-precision micro-displacement actuator for astronomical telescope mirror surface position adjustment

Abstract

The invention discloses a high-precision micro-displacement actuator for astronomical telescope mirror surface position adjustment. The actuator comprises a double-thread screw rod, the double-thread screw rod comprises two thread sections with the same spiral direction and different leads, namely a first thread section and a second thread section, displacement output is achieved through the relative lead difference of the first threaded section and the second threaded section, the first threaded section is sleeved with a first lead screw nut fixedly connected to the telescope rack in a matched mode, the first threaded section is connected with a driving device capable of driving the double-thread lead screw to rotate, the second threaded section is sleeved with a second lead screw nut in a matched mode, and the second screw rod nut is connected with the mirror surface. According to the high-precision micro-displacement actuator, when the position of the optical mirror surface is adjusted, the mirror surface is continuously displaced, and a gap or backlash phenomenon does not occur. The position adjustment precision of the mirror surface can reach a submicron level or even a nanometer level. Meanwhile, the micro-displacement actuator can be applied to other fields, such as occasions where the position requirement is high when structural parts are installed.

Description

technical field [0001] The invention relates to a precise mirror position adjustment device, in particular to a high-precision micro-displacement actuator. It is mainly used in the position adjustment of the optical mirror of the astronomical telescope. Background technique [0002] In order to reduce the cost and obtain good image quality, large-scale astronomical telescopes mostly use splicing mirror active optical technology, applying modern sensing and control technology, and splicing small-scale sub-mirrors into large-caliber mirrors. The micro-displacement actuator is a precise displacement output device, which completes the positioning, support and adjustment of the sub-mirror in the splicing mirror active optical technology. It must have high resolution, high stability, high stiffness, and high repeatability , large load performance, and millimeter-level travel, while overcoming or reducing harmful defects such as crawling, friction, hysteresis, backlash, and heat g...

AI Technical Summary

Problems solved by technology

[0004] Due to the complex structure of the coarse and fine combined platform type displacement actuator, the inchworm motor designed by the piezoelectric material using the "inchworm principle" has a large stroke and high precision. High, and can be self-locking when power is off, but the current market price is relatively high, and the domestic technology of this type of product is not yet mature, and for the micro-displacement actuator mechanism that uses the displacement amplification mechanism to amplify the stroke of the piezoelectric material, usually Under normal circumstances, the maximum expansion and contraction of the piezoelectric material per 1 millimeter of length is about 1 micron. Therefore, in order to improve the stroke range of the piezoelectric displacement actuator, although the displacement amplification mechanism is used, the stroke amplification capability is very limited, and at the same time Piezoelectric materials need to be continuously powered

However, for the commonly used reducer plus precision screw structure to achieve micro-displacement output, there is a gap in the transmission of gears or worm gears, and it is inevitable that there will be a gap in the displacement output, which limits its final displacement output accuracy.

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