A focusing mechanism based on flexible hinges for space telescope

Xiaozhe Ma; Chuang Li; Penghui Cheng; Bin Hu

doi:10.1117/12.2539681

8 July 2019 A focusing mechanism based on flexible hinges for space telescope

Xiaozhe Ma, Chuang Li, Penghui Cheng, Bin Hu

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110630H (2019) https://doi.org/10.1117/12.2539681
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

In this paper, a new type of focusing mechanism for space telescope is designed to compensate defocusing caused by alteration of space condition in orbit. The focusing mechanism is driven by a stepping motor and a worm gear reducer, transmitted by a ball screw and output by a flexible hinge. It has advantages of low mass, small overall size and especially high accuracy that is better than 1 micrometer. As one of main parts of focusing mechanism, the flexible hinge is mounted in the focusing shaft and connected to the nuts of ball screw kinematic pair which has mechanical end stops. The focusing shaft is guided by two couples of thin film boards to ensure the precise displacement along optical axis direction. The secondary mirror frame is connected to the shaft to complete focusing. Firstly, the focusing mechanism is designed, and the design scheme is illustrated in this paper. Then a modal analysis with finite element method for the mechanism is completed. The results show that the dynamic stiffness is high enough and meets the requirement.

Citation Download Citation

Xiaozhe Ma, Chuang Li, Penghui Cheng, and Bin Hu "A focusing mechanism based on flexible hinges for space telescope", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110630H (8 July 2019); https://doi.org/10.1117/12.2539681

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