Volume 5 Issue 4
Aug.  2012
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SHAO Ming-dong, GUO Jiang, SUN Ji-ming. Design of focusing mechanism for off-axis TMA mapping cameras[J]. Chinese Optics, 2012, 5(4): 373-379. doi: 10.3788/CO.20120504.0373
Citation: SHAO Ming-dong, GUO Jiang, SUN Ji-ming. Design of focusing mechanism for off-axis TMA mapping cameras[J]. Chinese Optics, 2012, 5(4): 373-379. doi: 10.3788/CO.20120504.0373

Design of focusing mechanism for off-axis TMA mapping cameras

doi: 10.3788/CO.20120504.0373
  • Received Date: 12 Mar 2012
  • Rev Recd Date: 13 May 2012
  • Publish Date: 10 Aug 2012
  • Based on the requirements of mapping cameras for imaging quality and the stability of inner orientation elements, the characteristics of three focusing strategies are analyzed in detail, and the strategy which is most suitable for the mapping cameras is confirmed. A ball screw driving linear-guide-type focusing mechanism is designed, and its focusing sensitivity is calculated to be 0.2 m. Precision testing and test validation are performed, which shows that the pointing accuracy of the focusing mechanism is superior to 2 and the positioning accuracy of the focusing mechanism is better than 3 m. Test results demonstrate that the designed focusing mechanism has the characteristics of compact structure, high stiffness and high displacement precision and it can meet the focusing requirements of off-axis TMA mapping cameras.

     

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