新型模組化微光學讀寫頭之設計與製造

A Novel Micro Optical System for Monolithic Integration of Optical Disk Pickup Heads

胡恆蒼(Heng-Cang Hu) ； 曾繁根(Fan-Gang Tseng)

《科儀新知》 147期 (2005/08) Pp. 35-41

https://doi.org/10.29662/IT.200508.0005

摘要

隨著資訊技術的進步，人類生活進入了網際網路與數位的多媒體時代，豐富的軟體、音樂、電影及資料庫等大量的資訊使得對於儲存系統的需求量及品質也日漸增加。更快速以及更高容量的光儲存系統不斷地被研發，因此，光儲存系統中的核心－光學讀寫頭的性能也必須不斷地提升，以符合次世代光儲存系統的需求。然而，傳統的光學讀寫頭由許多光學元件所組成，其元件間的相對位置均需要相當複雜且精密的組裝。本文提出了一全新微型光學讀寫頭的設計，其中包含了微機電系統中常被使用的費涅耳波帶片以及特殊製程製作的高分子斜四十五度面鏡三維結構。除了微型光學讀寫頭，本文亦提出了一製作高分子透鏡的方法，將此微透鏡作為聚焦物鏡，與所設計之微型光學讀寫頭整合，提供一整合度更高之微型光學讀寫頭。

並列摘要

As the progress of IT, the need for high speed and high-density data storage has become increasingly important. Denser and faster data storage methods have also been under developing for next generation need. As a result, the performance of optical storage units, such as an optical pickup head, need to be further improved to accommodate this new desire. However, commercial optical disk pickup head is mostly constructed with bulk micro-optics and many discrete components. The assembly needs intensive labors and poses large-size heads, greatly limiting operation speed and alignment accuracy. This study proposes a novel method to integrate precisely fabricated inclined-mirrors and on-chip Fresnel lens for optical pickup-head application. A new technology of glycerol-compensated incline-exposure has been adopted for the fabrication of 45° mirror pairs. This new integration approach provides an easy and low cost fabrication mean without the need of assembly. Furthermore, this study also proposes a novel method to fabricate the micro SU-8 lens. The novel SU-8 micro lens can be integrated with the micro optical pick-up head as a micro objective lens.