本文研究的主題是一種小型的電磁式致動器，利用經過磁場的電流所產生的羅倫茲力(Lorentz force)來驅動機構件，產生可控制的位移。此致動器可應用在光學讀取頭，作為承載物鏡的元件。光學讀取頭是光碟機中的關鍵元件，而光學讀取頭□的光電元件與物鏡致動器更是關鍵元件中的關鍵元件。本文設計了一款新穎的電磁式致動器，由一片電路板來做為致動器的可動部，其線圈乃是在電路板製作過程由銅箔蝕刻而成，稱之為平板型電磁式致動器。此致動器不但在可動部的製作上較傳統的設計簡單許多，而且包含了三個可控制的自由度，分別是光學讀取頭物鏡的聚焦方向、循軌方向以及徑向傾斜方向的自由度。依據電磁式致動器的運作原理完成架構設計之後，接著採用田口方法來對此電磁式致動器的磁路做最佳化設計，以提升致動器的感度特性。
文中首先簡介了光學讀取頭的光路、聚焦與尋軌控制回路以及常見的光學頭致動器的類型。其後介紹平板型電磁式致動器的原理、設計與模擬分析、元件設計。採用田口方法的參數設計對平板型電磁式致動器的磁路做最佳化設計，研究各個控制因子的水準變化對空氣隙的磁通密度之影響程度，並進而找出最佳的控制因子水準組合。依據最佳化之後的設計結果做出實體元件，組裝量測其特性並與估算值以及模擬結果做比對。同時，將此致動器與實體的光電元件組合成一個光學讀取頭，實際測試其聚焦與循軌的功能。實測結果證實此創新致動器的構想確實可行。

This work focuses on a small electromagnetic actuator, which can be used to generate controllable motion. This actuator can be used as an objective lens actuator in an optical pickup head. The optical pickup head is a key component in an optical disc storage system, and the objective lens actuator is a key component in an optical pickup head in the meanwhile. In this work, an innovative actuator, which is referred to as a “flat type electromagnetic actuator”, is designed. The moving part of this actuator is a piece of printed circuit board, and the coil is made of copper foil. After the structure design is finished, the magnetic circuit is optimized by applying Taguchi method in order to improve the sensitivity of this actuator.
In the beginning of this dissertation, general concept of an optical pickup head is introduced, including optical path design, basic servo, and some types of objective lens actuators. In the second part, the principle, simulation, structure design, and element design of the flat type electromagnetic actuator are introduced. In optimizing the magnetic circuit, the effects of the control factors on the magnetic flux density in the air gaps are identified as well as the optimal levels of the control factors. In the experiment part, the optimized actuator is fabricated. The frequency response of this actuator in the focusing, tracking, and radial tilt directions are tested, and the performance is close to what is predicted. The flat type electromagnetic actuator is assembled into an optical pickup head with the other optical and electronic components to test its performance. The test result proves the feasibility of this innovative actuator.

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