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14 May 2007 Aspheric design for manufacturability
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The experienced lens designer is well aware of the potential advantages aspherics can afford. Within the last few years, machines specifically designed for the CNC machining and polishing of glass aspheres have become commercially available through several manufacturers. This has brought down manufacturing cost to the point that designs incorporating aspheres can be used to reduce system cost compared to all spherical designs. (That is aspheres are no longer used just to save space and weight at the expense of cost.) Not all aspheres are equally manufacturable, however. Arbitrary choices at the beginning of a design can have major impact on manufacturing cost and limit final "as built" performance. This paper considers factors in designing ground and polished (as opposed to molded) glass aspheres which may not be obvious to even the experienced lens designer accustomed to using spherical surfaces or who has dealt with diamond turned aspheres. Factors considered include the surface shape, how the shape is specified, how the surface is to be tested and how it is toleranced. Emphasis will be placed on medium priced components where practical considerations are important.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Cody B. Kreischer "Aspheric design for manufacturability", Proc. SPIE 10316, Optifab 2007: Technical Digest, 1031602 (14 May 2007);


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