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Proceedings Paper

Optical design and tolerancing of an ophthalmological system
Author(s): Ingo Sieber; Thomas Martin; Allen Yi; Likai Li; Olaf Rübenach
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Paper Abstract

Tolerance analysis by means of simulation is an essential step in system integration. Tolerance analysis allows for predicting the performance of a system setup of real manufactured parts and for an estimation of the yield with respect to evaluation figures, such as performance requirements, systems specification or cost demands. Currently, optical freeform optics is gaining importance in optical systems design. The performance of freeform optics often strongly depends on the manufacturing accuracy of the surfaces. For this reason, a tolerance analysis with respect to the fabrication accuracy is of crucial importance. The characterization of form tolerances caused by the manufacturing process is based on the definition of straightness, flatness, roundness, and cylindricity. In case of freeform components, however, it is often impossible to define a form deviation by means of this standard classification. Hence, prediction of the impact of manufacturing tolerances on the optical performance is not possible by means of a conventional tolerance analysis. To carry out a tolerance analysis of the optical subsystem, including freeform optics, metrology data of the fabricated surfaces have to be integrated into the optical model. The focus of this article is on design for manufacturability of freeform optics with integrated alignment structures and on tolerance analysis of the optical subsystem based on the measured surface data of manufactured optical freeform components with respect to assembly and manufacturing tolerances. This approach will be reported here using an ophthalmological system as an example.

Paper Details

Date Published: 8 September 2014
PDF: 10 pages
Proc. SPIE 9195, Optical System Alignment, Tolerancing, and Verification VIII, 919504 (8 September 2014); doi: 10.1117/12.2060643
Show Author Affiliations
Ingo Sieber, Karlsruher Institut für Technologie (Germany)
Thomas Martin, Karlsruher Institut für Technologie (Germany)
Allen Yi, The Ohio State Univ. (United States)
Likai Li, The Ohio State Univ. (United States)
Olaf Rübenach, INGENERIC GmbH (Germany)

Published in SPIE Proceedings Vol. 9195:
Optical System Alignment, Tolerancing, and Verification VIII
José Sasián; Richard N. Youngworth, Editor(s)

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