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Proceedings Paper

Industrial process of aspherical lens surface manufacturing
Author(s): Stephane Di Luzio; Henry Gagnaire; Philippe Revel; Bernard Feraud; Christian Tirvaudey
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Paper Abstract

Aspherical surfaces are more and more used in some high precision optical systems of Thales Angenieux. They must conform to the same quality criteria of form and roughness as the other surfaces. However, their manufacturing is complex and cannot use the conventional methods of spherical or plano surfaces manufacturing. It is particularly difficult to meet simultaneously the form and roughness requirements even with the latest production techniques. Among the different possible aspherical surfaces manufacturing methods, Thales Angenieux chose to develop an industrial manufacturing process which combines two manufacturing methods: a microgrinding and a magnetorheological finishing. It was at first considered a manufacturing process with two stages of microgrinding and one stage of magnetorheological finishing. However, it was not possible to produce surfaces which meet the required criteria with these three stages despite an optimisation of microgrinding parameters. It proved to be necessary to insert a stage to insure the transition between a microgrinding stage and a magnetorheological finishing stage. This manufacturing process allows on the one hand to produce an aspherical surface with a form PV around 150 nm and a roughness Rms between 1 to 2 nm and, on the other hand, proves to be compatible with industrial manufacturing requirements.

Paper Details

Date Published: 26 February 2004
PDF: 12 pages
Proc. SPIE 5252, Optical Fabrication, Testing, and Metrology, (26 February 2004); doi: 10.1117/12.512860
Show Author Affiliations
Stephane Di Luzio, Thales Angenieux SA (France)
Henry Gagnaire, LTSI/Univ. Jean Monnet Saint-Etienne (France)
Philippe Revel, Univ. de Technologie de Compiegne (France)
Bernard Feraud, Thales Angenieux SA (France)
Christian Tirvaudey, Thales Angenieux SA (United States)

Published in SPIE Proceedings Vol. 5252:
Optical Fabrication, Testing, and Metrology
Roland Geyl; David Rimmer; Lingli Wang, Editor(s)

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