臺灣博碩士論文加值系統

本研究利用具有回授控制之動態雷射反饋雜訊量測系統，探討光碟機在運作時的雷射雜訊分布，進行藍光光學讀寫頭之離軸誤差對雷射反饋雜訊的影響之研究。此研究結合了自動控制理論、光電訊號量測與光路系統設計，以藍光光學讀寫頭作為量測之基本架構，搭配數位訊號處理器作為伺服控制器來驅動致動器，進行物鏡的控制，了解雷射雜訊在不同轉速與不同雷射功率下在各種離軸位置時，其相對雜訊強度(relative intensity noise, RIN)之變化情形。
　　實驗結果發現，光學讀寫頭之不同的離軸量會對雷射反饋雜訊有不同的影響，碟片轉速以及雷射輸出功率也會影響雜訊強弱。此外，本研究也驗證了在藍光系統中四分之一波長片確實可以降低雷射反饋雜訊，達到防治雜訊之目的。

This study investigates off-axis error of blue-light pickup heads while operating in an optical drive by dynamic laser feedback system. Our research is implemented with the combination of automatic control, optoelectronic signal measurement, and optical system design. We adopt the blue-light pickup head as the measuring configuration and use the digital signal processor (DSP) for the servo control to drive the actuator and control the objective lens. With the system, we can realize the variation of relative intensity noise (RIN) in different off-axis positions when they are under different rotating speed and laser powers, respectively.
　　The experimental results show that the diverse off-axis positions of the optical pickup heads will affect the laser feedback noise. Moreover, the disk rotating speed and laser power influence the laser feedback noise, too. Besides, the study also verifies that the quarter-wave-plate (QWP) is, indeed, able to reduce the laser feedback noise and achieve the noise.

摘 要 II
Abstract III
致 謝 IV
目 錄 V
圖目錄 VII
表目錄 IX
第一章、緒論 1
1.1研究背景與目的 1
1.2文獻回顧 2
1.3本文架構 3
第二章 光碟機系統簡介 5
2.1 DVD/CD 碟片規格比較 5
2.2 光碟機系統 6
2.3 光碟機伺服系統 8
2.3.1 光碟機聚焦伺服控制系統 10
2.3.1.1 聚焦誤差檢測方法 11
2.3.2 光碟機循軌伺服控制系統 13
2.3.2.1 循軌誤差檢測方法 15
2.3.3 光碟機尋軌伺服控制系統 16
2.3.4 光碟機主軸馬達伺服控制系統 17
2.3.5光碟機主軸馬達線速度對主軸馬達轉速頻率的計算 19
第三章、光碟機光學讀取頭雷射雜訊 21
3.1 光碟機中的雷射雜訊 21
3.2 雷射反饋雜訊的量測方式 23
3.3 光學頭聚焦與離軸對雷射反饋雜訊影響之研究 24
3.4 光學頭雷射反饋雜訊之防治 25
第四章、實驗方法與建構 29
4.1 簡介eZdsp LF2407A 29
4.2 聚焦循軌伺服硬體架構 30
4.3 聚焦伺服控制器設計 34
4.3.1 致動器系統鑑別 34
4.3.2 設計相位落後領先補償器 36
4.3.3 聚焦補償器數位化 39
4.3.4 致動器DSP程式設計 41
4.5光學頭雷射反饋雜訊量測系統架構 44
4.6光學頭離軸反饋雜訊量測系統架構 47
4.7相對強度雜訊值計算方式 47
第五章 實驗結果與討論 49
5.1藍光雷射二極體特性曲線量測 49
5.2 HD-DVD聚焦伺服實驗 50
5.3四分之ㄧ波長片對雷射反饋雜訊之影響 51
5.4離軸軌道位置變化對雷射反饋雜訊影響之量測 52
5.5轉速變化對離軸位置及雷射反饋雜訊影響之量測 54
5.6光強變化對離軸位置及雷射反饋雜訊影響之量測 55
第六章 結論與未來展望 62
6.1 結論 62
6.2未來展望 63
參考文獻 64
中英對照表 67
作者簡歷 73

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