14 May 2007 Centration expressions and conversions
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Abstract
Lens centration tolerances are an essential consideration in optical design and assembly, and achieving them is a fundamental phase of optical fabrication. The tolerances for centration may be expressed in any of several different ways (including wedge, edge thickness variation, beam deviation, image decenter) by the designer or draftsperson; and may then be measured in the shop according to a different set of parameters (including wedge, edge thickness variation, beam deviation, surface reflection orbits, edge lateral runout) depending on available equipment and methods. The necessary conversions between expressions are subtle, easily misunderstood, and not readily available. The available literature is not entirely consistent. This paper provides definitions, diagrams, explanations, derivations, and conversions between the various expressions. Aspheric lenses have additional datum features and are not addressed in this paper.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ray Williamson, "Centration expressions and conversions", Proc. SPIE 10316, Optifab 2007: Technical Digest, 103160Z (14 May 2007); doi: 10.1117/12.717256; https://doi.org/10.1117/12.717256
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