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Proceedings Paper

Centration expressions and conversions
Author(s): Ray Williamson
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Paper 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.

Paper Details

Date Published: 14 May 2007
PDF: 4 pages
Proc. SPIE 10316, Optifab 2007: Technical Digest, 103160Z (14 May 2007); doi: 10.1117/12.717256
Show Author Affiliations
Ray Williamson, Ray Williamson Consulting (United States)


Published in SPIE Proceedings Vol. 10316:
Optifab 2007: Technical Digest
James J. Kumler; Matthias Pfaff, Editor(s)

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