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Proceedings Paper

A Unique Solution To Aspheric Measurement And Analysis As Part Ofa Manufacturing Process
Author(s): D. M.G. Stevens
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Paper Abstract

Over the last five years the Aspheric form has become a commonly used geometric shape, primarily in the optical industry for components such as contact lenses and compact disc laser focusing optics. The dimensions of these Aspherisities are sub-micron, yet must still be controlled to retain the designers intended function of the component. This control can be attained by measurement of the Aspheric form using a contacting stylus instrument. The measurement data, stored in the microprocessor, can now be fitted to the designers required form and after least squares alignment can be removed to leave the error of form introduced during production. Having obtained this error, it is possible to vary the designers input parameters to minimize this error and hence determine the absolute adjustment required on the component generator. This paper firstly explains what an Aspheric form is, and describes a systematic method of quantifying departure from the required geometry and concludes by showing a practical example of how these results can be used to adjust the Aspheric generator as part of an in-process close control loop.

Paper Details

Date Published: 1 January 1987
PDF: 7 pages
Proc. SPIE 0802, In-Process Optical Metrology for Precision Machining, (1 January 1987); doi: 10.1117/12.967111
Show Author Affiliations
D. M.G. Stevens


Published in SPIE Proceedings Vol. 0802:
In-Process Optical Metrology for Precision Machining
Peter Langenbeck, Editor(s)

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