本研究主要探討手機相機光學系統的容差設計及機械容差對系統的影響。研究的進行先選用適當的專利規範為參考的光學系統結構，繼而依產品需要的規格變更設計參數值。在反覆尋求最適設計的過程中，較棒的操作是利用約束條件控制非球面透鏡的輪廓，使透鏡組有較寬鬆的製造與組裝容差。為了在達成預期成像品質的前提下使製造成本為最小值，本研究對光學系統進行容差分析，並且依據分析後各個容差種類的靈敏度重新分配容差範圍。基於研究中使用的軟體容差模組只能規範組裝後光學系統的變異而非機構元件外型的變異，本研究嘗試針對特定的鏡頭夾持方式，探討元件尺寸容差與幾何容差所受到的約束條件。

This work studies the tolerance design of the camera module in cell phones. The research focuses on the tolerance specifications assigned to the optical and mechanical components in the module. A complete design process is described in this thesis. The design starts from choosing a patent camera module of which the optical structure is close to the design goal. The function specification and physical restrictions are then properly defined and an initial design is obtained by modifying the optical parameters from the patent module. Next, an optimization process is conducted through a commercial optic design software package. During the process, proper restrictions to control the profile of aspheric lens are essential to get reasonable outputs.
In order to have products with good quality but competitive price, the design process searches for the robust parameters by means of tolerance analysis. From a given amount of allowable performance degradation, a functional tolerance budget is distributed to the optical components based on sensitivity analysis. It is an iterative process and the adjustments of system parameters are required to enlarge individual tolerances of the components system from a fixed total budget. Since the design software available can only deals with dimensional variations at the assembly condition, a detailed tolerance design is necessary to ensure the quality of an optomechanical system. For a predefined mounting arrangement, this work also studies the geometry constraints due to the size tolerances and the geometrical tolerances specified with the mechanical components of the camera module.

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