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Optical Design and Tolerancing of an Ophthalmological System

机译：眼科系统的光学设计和公差

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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.
机译：通过仿真进行公差分析是系统集成的重要步骤。公差分析允许预测实际制造零件的系统设置的性能，并允许根据评估数字（例如性能要求，系统规格或成本要求）估算成品率。当前，光学自由形式光学在光学系统设计中变得越来越重要。自由曲面光学器件的性能通常在很大程度上取决于表面的制造精度。因此，关于制造精度的公差分析至关重要。由制造过程引起的形状公差的表征基于直线度，平面度，圆度和圆柱度的定义。但是，对于自由形式的组件，通常无法通过此标准分类来定义形状偏差。因此，不可能通过常规的公差分析来预测制造公差对光学性能的影响。为了对光学子系统（包括自由形式的光学器件）进行公差分析，必须将制造表面的度量数据集成到光学模型中。本文的重点是针对具有集成对准结构的自由形式光学器件的可制造性进行设计，以及基于已制造的光学自由形式组件的相对于组装和制造公差的实测表面数据，对光学子系统进行公差分析。这种方法将在这里以眼科系统为例进行报告。

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