透鏡組設計結構參數的選用為影響整體系統成像品質優劣的重要因素。本文以Cooke鏡組為例探討如何利用穩健化設計技術配合現有的光學設計商業軟體，進行有效率的系統設計。研究中應用田口方法於成像品質已不錯的初始設計，經由調整設計參數以進一步提升系統對受製造組裝誤差等雜音影響的穩定性。文中先簡介像差的基本原理，藉以選擇適當的參數作為田口實驗之設計因子。其次選用L’36作為內直交表與外直交表來規劃控制因子及雜音因子，而後應用S/N訊噪比來選擇系統參數的最佳水準。由Cooke鏡組設計的分析，發現穩健化技術的應用確實能有效改進鏡組的設計流程。

The selection of structure parameters is the key factor that determines the image quality of an optical system. This work studies the robust parameter design of Cooke Lens. Taguchi’s method is applied to the design of an optical system of which the initial values of parameters are originated from a patent module. The design process is searching for the systems which have acceptable performance even though the dimensions of its components slightly deviated from their nominal values.
The basic theory of aberration is first discussed and a few parameters are then chosen as the design factors for experiments. L’36 is adopted for both the inner orthogonal array and the outer orthogonal array from which different levels of the control and noise factors are assigned. Later, signal-to-noise ratio is defined as the criterion in searching the best level for the parameters. Starting from different sets of initial parameters, all of the resultant designs show that larger tolerances can be assigned to the optomechanical system and the design process can be more efficient.

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