隨著智慧型手機普及與長焦攝影需求提升，如何在有限的機身厚度條件下實現高倍率光學變焦，已成為行動裝置鏡頭設計中的關鍵課題。為兼顧高倍率變焦能力與模組微型化需求，本研究提出一套適用於智慧型手機之潛望式九倍(9×)光學變焦鏡頭設計。 考量行動裝置輕薄化趨勢，本論文設計之光學系統最大有效口徑尺寸，並限制於厚度 5 mm 以內作為設計條件。透過潛望式變焦鏡頭架構，並選用五百萬畫素(5MP)、長寬比為 16:9 之影像感測器以降低像高需求，進而減少鏡頭模組於機身厚度方向之尺寸限制。 光學系統設計依據上述條件，透過 CODE V 光學模擬軟體完成變焦鏡頭設計與最佳化。最終設計之有效焦距範圍為 3.005–27.045 mm，對應全視場角為 58°–7.048°，入瞳口徑範圍為 0.939–3.005 mm，F/# 介於 3.2–9.0。結果顯示，在各變焦位置下，鏡頭深度可控制於 5 mm 以內，且成像品質符合調制轉移函數、光學畸變與相對照度之設計需求。 本研究證實，在嚴格的機構限制下，透過潛望式光學架構與感測器規格之合理配置，可實現具備良好成像品質之九倍光學變焦鏡頭系統，驗證其於超薄型手機及行動裝置應用之可行性。 ;With the widespread adoption of smartphones and the growing demand for telephoto photography, achieving high-magnification optical zoom within the limited thickness of a handset has become a key challenge in mobile camera lens design. To satisfy both high zoom capability and module miniaturization, this study proposes a periscope-type 9× optical zoom lens design for smartphones. To address the ongoing trend toward slimmer mobile devices, the proposed optical system constrains the maximum effective aperture size (system depth) to within 5 mm as a primary design condition. By adopting a periscope-type zoom architecture and selecting a 5-megapixel (5MP) image sensor with a 16:9 aspect ratio to reduce the required image height, the module size along the handset thickness direction is further minimized. Based on these conditions, the zoom lens was designed and optimized using the CODE V optical simulation software. The final design achieves an effective focal length (EFL) range of 3.005–27.045 mm, corresponding to a full field of view (FOV) of 58°–7.048°. The entrance pupil diameter ranges from 0.939 to 3.005 mm, and the F-number (F/#) varies from 3.2 to 9.0. The results indicate that, across all zoom positions, the lens depth can be maintained within 5 mm, while the imaging performance meets the design requirements in modulation transfer function (MTF), optical distortion, and relative illumination. This study demonstrates that, under stringent mechanical constraints, a 9× optical zoom lens system with favorable imaging quality can be realized through a periscope optical architecture and a well-justified selection of sensor specifications, thereby validating its feasibility for ultra-slim smartphones and mobile device applications.
