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Proceedings Paper

Slow tool servo diamond turning of optical freeform surface for astigmatic contact lens
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Paper Abstract

Three ultra-precision machining processes namely fast tool servo, slow tool servo and diamond milling, are frequently used to produce optical freeform surface. Slow tool servo machining has the advantages of no extra attachment and fast setting-up, however the three dimensional tool shape compensation and tool-path generation must be conducted carefully for getting high form accuracy and fine surface finish. This research aimed to develop a model of three dimensional tool shape compensation for generating 3D tool path in slow tool servo diamond turning of asymmetrically toric surface for astigmatic contact lens. The form accuracy of freeform surface was measured by ultra-high accuracy 3D profilometer (UA3P) with user define function. After correction, the form error is less than 0.5μm both in X- and Y-direction and the surface roughness is less than 5nm.

Paper Details

Date Published: 27 September 2011
PDF: 9 pages
Proc. SPIE 8126, Optical Manufacturing and Testing IX, 812617 (27 September 2011); doi: 10.1117/12.892447
Show Author Affiliations
Chun-Chieh Chen, Instrument Technology Research Ctr. (Taiwan)
Yuan-Chieh Cheng, Instrument Technology Research Ctr. (Taiwan)
National Tsing Hua Univ. (Taiwan)
Wei-Yao Hsu, Instrument Technology Research Ctr. (Taiwan)
Hsiao-Yu Chou, Instrument Technology Research Ctr. (Taiwan)
Pei-Jen Wang, National Tsing Hua Univ. (Taiwan)
Din Ping Tsai, Instrument Technology Research Ctr. (Taiwan)
National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8126:
Optical Manufacturing and Testing IX
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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