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Proceedings Paper

Freeform optics fabrication by diamond turning
Author(s): Wenda Jiang; Bill Tse
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Paper Abstract

LPI Precision Optics Ltd. in Hong Kong has successfully produced some very complex prototype freeform optics and mold inserts by using Nanotech 350- FG five axis diamond turning machine. One of such typical optics is an LED car head lamp, which consists of several non-symmetrical freeform surfaces. In order to make these surfaces, we have developed in-house special software which can combine 3D freeform surface with DT parameters to generate slow tool servo program for diamond turning. The software can generate program not only for single freeform surface or multiple freeform surfaces but also for freeform lens arrays. The produced freeform surfaces were measured by 3D interferometer and compared with the designed CAD models. The form deviation was around 5 um and the surface roughness was within 10 nm. Diamond milling was employed to fabricate more complicated multifaceted freeform surfaces. The milling program was optimized by means of UG software. Processing parameters and details are to be discussed in the paper.

Paper Details

Date Published: 14 May 2007
PDF: 4 pages
Proc. SPIE TD04, Optifab 2007: Technical Digest, TD0422 (14 May 2007); doi: 10.1117/12.720268
Show Author Affiliations
Wenda Jiang, LPI Precision Optics Ltd. (Hong Kong China)
Bill Tse, LPI Precision Optics Ltd. (Hong Kong China)


Published in SPIE Proceedings Vol. TD04:
Optifab 2007: Technical Digest
James J. Kumler; Matthias Pfaff, Editor(s)

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