8 October 2015 The design of aerial camera focusing mechanism
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Proceedings Volume 9677, AOPC 2015: Optical Test, Measurement, and Equipment; 96771F (2015) https://doi.org/10.1117/12.2199676
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China
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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Changchang Hu, Hongtao Yang, Haijun Niu, "The design of aerial camera focusing mechanism", Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96771F (8 October 2015); doi: 10.1117/12.2199676; https://doi.org/10.1117/12.2199676
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