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Proceedings Paper

The design of aerial camera focusing mechanism
Author(s): Changchang Hu; Hongtao Yang; Haijun Niu
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Paper Abstract

In order to ensure the imaging resolution of aerial camera and compensating defocusing caused by the changing of atmospheric temperature, pressure, oblique photographing distance and other environmental factor [1,2], and to meeting the overall design requirements of the camera for the lower mass and smaller size , the linear focusing mechanism is designed. Through the target surface support, the target surface component is connected with focusing driving mechanism. Make use of precision ball screws, focusing mechanism transforms the input rotary motion of motor into linear motion of the focal plane assembly. Then combined with the form of linear guide restraint movement, the magnetic encoder is adopted to detect the response of displacement. And the closed loop control is adopted to realize accurate focusing. This paper illustrated the design scheme for a focusing mechanism and analyzed its error sources. It has the advantages of light friction and simple transmission chain and reducing the transmission error effectively. And this paper also analyses the target surface by finite element analysis and lightweight design. Proving that the precision of focusing mechanism can achieve higher than 3um, and the focusing range is ±2mm.

Paper Details

Date Published: 8 October 2015
PDF: 7 pages
Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96771F (8 October 2015); doi: 10.1117/12.2199676
Show Author Affiliations
Changchang Hu, Xi'an Institute of Optics and Precision Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Hongtao Yang, Xi'an Institute of Optics and Precision Mechanics (China)
Haijun Niu, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 9677:
AOPC 2015: Optical Test, Measurement, and Equipment
Sen Han; Jonathan D. Ellis; Junpeng Guo; Yongcai Guo, Editor(s)

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