Volume 3 Issue 5
Nov.  2010
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Chinese Optics  > 2010  >  3(5): 462-466.
ZHANG Xin-jie, WANG Shu-qing, YAN Chang-xiang. Design and analysis for focusing mechanism of space camera[J]. Chinese Optics, 2010, 3(5): 462-466.
Citation: ZHANG Xin-jie, WANG Shu-qing, YAN Chang-xiang. Design and analysis for focusing mechanism of space camera[J]. Chinese Optics, 2010, 3(5): 462-466.
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Design and analysis for focusing mechanism of space camera

  • Chanchun Institute of Optics,Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033,China

  • Received Date: 14 May 2010
  • Rev Recd Date: 17 Jul 2010
  • Publish Date: 25 Oct 2010
    Abstract
  • A kind of focusing structure of space camera is presented, which adopts a kind of precision harmonic gear drive. The wave generator in the device is combined with an elliptic cam and a flexible bearing and its output shaft connected ball screws translates the rotational motion to the linear motion and drives the focusing mirror repeated moving along a linear guide. The output rigid wheel is connected with an absolute encoder to detect the displacement of focusing movements. It has the characteristics of big transmission ratio, high precision, compact structure, high efficiency, smooth running etc. According to the practical application of this harmonic gear drive in the space camera, the location relationship between the displacement of focusing structure and the focal plane movement is derived, and the system error is analyzed. Then, the system accuracy is tested with an open-loop control method. Experimental results show that transmission ratio of the instrument is 1∶ 70, and the repeated positional accuracy is 2 m, which meets the requirements of practical applications.

     

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