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Micromachines 2016, 7(5), 85;

Robust Design of an Optical Micromachine for an Ophthalmic Application

Karlsruhe Institute of Technology, Institute for Applied Computer Science, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
This paper is an extended version of our paper published in Optical System Alignment, Tolerancing, and Verification VIII, San Diego, CA, USA, 17–21 August 2014
Author to whom correspondence should be addressed.
Academic Editors: Pei-Cheng Ku and Jaeyoun (Jay) Kim
Received: 14 March 2016 / Revised: 26 April 2016 / Accepted: 3 May 2016 / Published: 6 May 2016
(This article belongs to the Special Issue Micro/Nano Photonic Devices and Systems)
Full-Text   |   PDF [5058 KB, uploaded 6 May 2016]   |  


This article describes an approach to the robust design of an optical micromachine consisting of a freeform optics, an amplification linkage, and an actuator. The robust design approach consists of monolithic integration principles to minimize assembly efforts and of an optimization of the functional components with respect to robustness against remaining assembly and manufacturing tolerances. The design approach presented involves the determination of the relevant tolerances arising from the domains manufacturing, assembly, and operation of the micromachine followed by a sensitivity analysis with the objective of identifying the worst offender. Subsequent to the above-described steps, an optimization of the functional design of the freeform optics with respect to a compensation of the effects of the tolerances is performed. The result leads to a robust design of the freeform optics and hence ensures a defined and optimal minimum performance of the micromachine in the presence of tolerances caused by the manufacturing processes and the operation of the micromachine. The micromachine under discussion is the tunable optics of an ophthalmic implant, an artificial accommodation system recently realized as a demonstration model at a scale of 2:1. The artificial accommodation system will be developed to replace the human crystalline lens in the case of a cataract. View Full-Text
Keywords: robust design; tolerance analysis; freeform optics; optical modeling and simulation; design optimization; ophthalmic implant robust design; tolerance analysis; freeform optics; optical modeling and simulation; design optimization; ophthalmic implant

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sieber, I.; Martin, T.; Gengenbach, U. Robust Design of an Optical Micromachine for an Ophthalmic Application. Micromachines 2016, 7, 85.

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