本研究旨在設計一組可同時支援藍光光碟（Blu-ray Disc, BD）與數位多功能光碟（Digital Versatile Disc, DVD）之複合式光學讀寫頭系統。藉由雙波長共軸光路整合技術，有效提升光學模組之整合度，並達成模組小型化與系統簡化之設計目標。本設計採用波長分別為405 nm與650 nm之雷射光源，搭配菱形分光稜鏡進行光束導引與分波操作，並透過波長選擇結構，使兩波長光源得以共用同一組準直鏡與物鏡，實現系統共軸光路設計。 本研究之物鏡與準直鏡設計，主要是讀取藍光光碟片之波長(405nm)與其數值孔徑(NA= 0.85)做設計，而DVD設計由於讀取兩種光碟格式之波長與基板厚度差異，會新增一些像差，為校正其像差，需要再DVD光路上新增一非球面來補償其像差。 整體而言，本研究所提出之雙波長複合式光學讀寫頭共軸光路系統，不僅兼具設計可行性與製造實用性，亦具備應用於多格式光碟播放與高密度儲存設備之潛力，為光學讀寫模組之整合與應用提供一具參考價值之設計架構。 ;This study presents the design of a composite optical pickup head (OPH) system capable of supporting both Blu-ray Discs (BD) and Digital Versatile Discs (DVD). Through the implementation of a dual-wavelength coaxial optical path integration technique, the proposed system effectively enhances the optical module’s level of integration while achieving miniaturization and structural simplification. The design employs laser sources with wavelengths of 405 nm and 650 nm, combined with a rhomboid beam-splitter prism for beam guiding and wavelength separation. By incorporating a wavelength-selective structure, both laser sources are able to share the same collimating and objective lenses, thereby realizing a fully coaxial optical configuration. The objective and collimating lenses were designed primarily for the Blu-ray wavelength (405 nm) with a numerical aperture (NA) of 0.85. However, when reading DVD media, additional aberrations arise due to differences in wavelength and substrate thickness between BD and DVD formats. To correct these aberrations, an additional aspheric surface was introduced in the DVD optical path to ensure precise focusing performance. Overall, the proposed dual-wavelength composite OPH demonstrates both design feasibility and manufacturability, while offering strong potential for applications in multi-format optical disc playback and high-density data storage systems. The results of this research provide a valuable reference for the integration and optimization of future optical pickup modules.
