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Proceedings Paper

Fast fabrication of high-gradient optical aspheric surface by CNC machine
Author(s): Weimin Zheng; Tianning Cao; Yanzhou Xu; Min Qian
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Paper Abstract

For fabricating a high gradient aspherics, we have designed a ZDCCOS complex, which consist of a CNC Polisher and a CQG- II digital wavefront interferometer. The Polisher has 5 degrees of freedom. The computer makes a small tool to move in three dimensions and drive the workpiece to sway, and turn around simultaneously to keep the pad in the normal directions of the workpiece surface. We designed a special dual-rotation tool and presented a new model to calculate the removal function of which. the model was verified by the experiments. The track programming algorithm was also designed to make the tools to move on spatial concentric circles, during the fabrication processes. The work piece was a (Phi) 300 mm, F5.9 focus lens, the aspheric degree of which was up to 46 micrometers . But only after 8 hours 43 minutes continuous fine grinding, and about 15 hours polishing, the surface error was decreased to 1(lambda) (Rms, (lambda) equals 0.6328 micrometers ).

Paper Details

Date Published: 5 August 1998
PDF: 7 pages
Proc. SPIE 3557, Current Developments in Optical Elements and Manufacturing, (5 August 1998); doi: 10.1117/12.318310
Show Author Affiliations
Weimin Zheng, Zhejiang Univ. (China)
Tianning Cao, Zhejiang Univ. (China)
Yanzhou Xu, Zhejiang Univ. (China)
Min Qian, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 3557:
Current Developments in Optical Elements and Manufacturing
Qiming Xin; Robert E. Parks, Editor(s)

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