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Study of In-Line Gratings for Optical Pickup Heads
|關鍵字:||差動推挽法;differential push-pull;同軸式光柵;光學讀寫頭;循軌誤差訊號;in-line grating;optical pickup head;tracking error signal||出版社:||機械工程學系所||引用:||T. Ide, S. Kimura, E. Tatsu, T. Kurokawa, K. Watanabe, Y. Anzai, and T. Shintani, “Interlayer crosstalk reduction of a multilayer Blu-ray disc using a grating in a three beam optical system” , Applied Optics, vol. 49, No. 12, p. 2309, 2010 H. Nakahara, M. Ohmaki, M. Shinoda, T. Matozaki, and N. Takeshita, “One-beam push–pull method with simple holographic optical element for multilayer Blu-ray discs”, Japanese Journal of Applied Physics, vol. 50, No. 9, p. 1,2011 K. Osato, “A new tracking servo method: Differential push-pull method”, in Technical Digest of International Symposium on Optical Memory, p. 127, 1986. M. Shinoda, “In-line-type differential push-pull methods for tracking error detection”, IEEE Transactions on Magnetics, vol. 47, No. 3, p. 532, 2011. Y. Morimoto, C. Buchler, H.J. Schroder, G. Weissmann, F. Zucker, and D. Uhde, “Transversal push-pull method for optical pickup” , IEEE Transactions on Consumer Electronics, vol. 35, No. 4, p. 810, 1989 R. Katayama, S. Meguro, and Y. Komatsu, “Land/groove signal and differential push-pull signal detection for optical disks by an improved 3-beam method” , Japanese Journal of Applied Physics , vol. 38, No. 3, p. 1761, 1999 K. Izumi, K. Ohnishi, M. Inoue, T. Shimano, and Y. Sugi, “Techniques for reading DVD-RAM disc with DVD-ROM drives”, IEEE Transactions on Consumer Electronics, vol. 45, No. 4, p. 1284, 1999 T. Ueyama, K. Sakai, and Y. Kurata, “A novel tracking servo system for multitypes of digital versatile disks using phase-shift differential push-pull method” , Japanese Journal of Applied Physics , vol. 42, No. 2, p. 952, 2003 T. Ueyama, Y. Watanabe, T. Numata, K. Sakai, M. Horiyama, Y. Nakata, and Y. Kurata, “New tracking servomechanism using phase-shift differential push-pull method for recordable optical disks” , Japanese Journal of Applied Physics , vol. 43, No.7, p. 4806, 2004 H. Nakahara, K. Nakai, T. Matozaki, and N. Takeshita, “Progressive differential push-pull method for dual-layer Blu-ray Disc recording”, IEEE Transactions on Consumer Electronics, vol. 56, No. 3, p. 1511, 2010 M. Shinoda, K. Nakai, and N. Takeshita, “Dependence of tracking error characteristics on objective lens shift for in-line-type differential push–pull methods using segmented gratings” , Optical Review, vol. 17, No. 4 , p. 360, 2010 M. Shinoda, and K. Nakai, “Dependence of tracking error characteristics of in-line-type differential push–pull methods on arrangement error of segmented gratings” , Optical Review, vol. 18, No. 5 , p. 367, 2011 伍秀菁, 汪若文, 林美吟, “光機電系統整合概論”, 國家實驗研究室儀科科技中心出版, 2005 許雅雯, “應用於電腦斷層影像光譜儀之二維繞射光學元件之研究”, 國立中興大學機械工程學系碩士論文, 2010 E. Hecht, “Optics”, Addison-Wesley, 2002 H. Papadimitriou, “Optimality of the fast Fourier transform”, Journal of the Association for Computing Machinery, vol. 26, No. 1, p. 95, 1979 P. V.O''Neil, “Advance engineering mathematics”, Thomson, 2003 莊達人, “VLSI 製造技術”, 高立出版社, 2004||摘要:||
本研究探討各種同軸式光柵(in-line grating)在光學讀寫頭(optical pickup head, OPH)作循軌偵測時所產生之差動推挽(differential push-pull, DPP)訊號特性。同軸式差動推挽法有別於傳統差動推挽法，其優點在於不需考慮各種碟片軌道間距與各繞射階間所對應之夾角關係。藉由本研究，我們獲得各種同軸式光柵之循軌誤差訊號(tracking error signal, TES)品質，並探討適用於光學讀寫頭應用之同軸式光柵圖型。
利用Matlab數值分析軟體，首先對同軸式光柵進行相位分佈設計。接著對該相位分佈作快速傅立葉轉換(fast Fourier transform, FFT)，模擬出零階與正、負一階繞射光之強度分佈與碟片軌道相對關係。並模擬出同軸式光柵之推挽訊號干涉分佈。進而依照各類不同碟片之軌道間距進行循軌誤差訊號之計算，並比較各種同軸式光柵在物鏡偏移時對循軌誤差訊號品質所造成之影響。經由模擬得知，DVD-R與BD-R碟片之循軌誤差訊號具有相同趨勢。減少同軸式光柵中間區域寬度所佔的面積，可獲得較佳的循軌誤差訊號。
This study investigated various types of in-line gratings on generating the differential push-pull (DPP) signal for the tracking detection of an optical pick head (OPH). The method of in-line DPP is different from that of the conventional DPP. The advantage is that it doesn’t need to consider the relation between the track pitch of each disk type and the corresponding angle of diffraction orders. With the study, we obtained the quality of the tracking error signals (TESs) for various types of in-line gratings, and discussed the in-line grating patterns that are applicable to the OPH applications.
By using the numerical analysis software of Matlab, we first designed the phase profiles of the in-line gratings. The fast Fourier transform was then applied to simulate the intensity distributions of the zeroth, positive-first, and negative-first diffraction orders. Besides, we simulated the interference distributions of the push-pull signals for the in-line gratings. Furthermore, the TESs were calculated according to the track pitch of different disk types. Also, the comparisons between the TES quality and the shifting effect of the objective lens were performed for various types of in-line gratings. After the simulation, we found that the TESs of DVD-R and BD-R disks have the same tendency. A better TES could be obtained by reducing the width of the intermediate region of an in-line grating.
Finally, the devices of all simulated in-line grating patterns were fabricated by using the photolithography and etching processes. Their optical diffraction efficiencies were verified for being consistent with the original designs. The dark and bright variations of the push-pull signal were also experimentally observed by setting up two OPH configurations.
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