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研究生:林罡鼎
研究生(外文):Gang-Ding Lin
論文名稱:新式可變焦距液晶補償器之研究
論文名稱(外文):Study of Novel Tunable-Focus Liquid Crystal Compensator
指導教授:施錫富
學位類別:碩士
校院名稱:國立中興大學
系所名稱:機械工程學系所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:76
中文關鍵詞:液晶折射率梯度分佈透鏡可變焦距微型相機模組環型電極
外文關鍵詞:liquid crystalgradient refraction index lenstunable focal lengthcompact camera modulemulti-ring electrodes
相關次數:
  • 被引用被引用:4
  • 點閱點閱:129
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:2
傳統上一般的自動對焦系統需藉由致動器改變鏡組之位置,以達到變焦的效果,但致動器本身的體積有縮小上的限制,因此本論文根據液晶(liquid crystal)之雙折射(birefringence)性質與其易受電場影響而重新取向之光電特性,設計出具有可切換正、負型透鏡特性之液晶補償器,可搭配於微型相機模組(compact camera module, CCM)之定焦物鏡系統中,不需移動鏡組位置即可達到變焦的功能,且補償器主要的體積只來自於所選用的玻璃厚度,所以整體模組之重量及大小均可更為縮小。

利用環型電極之設計來形成梯狀的電壓分佈,使補償器內液晶層產生如同正、負型透鏡般的折射率分佈,並可藉由外部電壓的改變使元件產生正、負型透鏡特性的切換。接著以手機之定焦鏡組為模擬架構,利用光學設計軟體模擬探討適用之液晶補償器,並藉由液晶受電場影響之動力分析,推導施加電壓與液晶旋角分佈之關係,再配合環型電極之設計,推算出欲產生特定相位延遲分佈所需施加於液晶補償器之驅動電壓。實做的部份將液晶補償器封裝完成,並於實驗中驗證其可切換正、負型透鏡之特性。
Traditionally, the general auto-focusing system needs to adjust the position of the lens group using the actuator for tuning the focal length. However, the actuator has some restriction on reducing the device dimension. Based on two characteristics of liquid crystal (LC), one is the birefringence and the other is the electro-optical activity, we designed a LC compensator available to be switched between the positive or negative type of a lens. This device can be collocated with the fixed focal length system of compact camera module (CCM). Without moving the position of lens group, the focal length is able to be tuned. Moreover, owing to the dependence of glass thickness for the compensator size, the compactness of the whole module can be effectively achieved.

We applied multi-ring electrodes to construct the ladder-like voltage distribution and made the index of refraction inside the compensator as the positive or negative type of a lens. Furthermore, the two different types can be switched by applying different voltages. Then, we set the fixed focal length module of a cell phone as the simulated model and discussed the appropriate LC compensator designs with the aid of the optical design software. According to the analysis of LC dynamics, we determined the relations between the applied voltage and distribution of the LC tilt angle. Combined with the multi-ring electrodes, we calculated the driven voltage to produce the particular phase retardation. With the packaged LC compensator, the experimental results show that it is available to be switched between the positive or negative type of a lens.
摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 IX
第一章 緒論 1
1-1 背景與研究目的 1
1-2 文獻探討 3
1-3 論文架構 7
第二章 相關理論介紹 8
2-1 模糊圓 8
2-2 液晶 10
2-2-1 液晶簡介 10
2-2-2 液晶之分類 10
2-2-3 液晶之物理特性 15
2-3 液晶補償器原理 21
2-3-1 折射率梯度分佈透鏡 21
2-3-2 液晶補償器原理 23
第三章 液晶補償器之設計與分析 27
3-1 手機相機成像分析 27
3-2 液晶補償器之設計 29
3-3 雙層式液晶補償器 42
3-4施加電壓分析 47
第四章 液晶補償器之製作 57
4-1 黃光微影製程 57
4-2 液晶定向製程 58
4-3 液晶封裝 60
第五章 實驗與分析 61
5-1 樣品說明 61
5-2 實驗架設 63
5-2-1 相位延遲量測架構 63
5-2-2 成像量測架構 66
第六章 結論與未來展望 68
6-1 結論 68
6-2未來展望 69
參考文獻 70
中英對照 72
作者簡歷 76
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