磁預壓力之改良與線性分析及其應用

蔡伯加(BO-JIA TSAI)

指導教授 ： 劉建聖

國立中正大學/工學院/機械工程學系/碩士(2016年)

摘要

傳統的手機相機模組大部分都是使用彈片式開迴路音圈馬達致動器、其中作動原理是利用彈片的回復力來進行重覆定位與自動對焦的功能，但傳統彈片存在著製造與組裝的困難。鑒於此本實驗室李鴻飛學長在先前研究中有發展一款利用磁預壓力取代傳統彈片的手機相機音圈馬達模組，但此架構存在著磁預壓力要達到線性輸出的議題，因此學長在論文最後藉由本實驗室既有的磁預壓力校正專利架構初步上以模擬來驗證磁預壓力校正的可行性。
本論文將以此方法來針對手機相機音圈馬達磁預壓力輸出的設計改良，首先設計一個磁預壓力量測平台並以實驗方式來驗證增加導磁軛鐵片前後磁預壓力線性度的影響，在以此結構為設計基礎改良成一款具有自動對焦功能性的無彈片開迴路式手機相機模組，且利用磁路模擬軟體搭配電腦繪圖軟體對此手機相機模組建立相關尺寸鏈與極限公差模擬分析，最後以實驗來做功能性的驗證，成為一款具有高線性度、低耗能與實用的音圈馬達裝置。

關鍵字

磁預壓力 ； 線性度 ； 手機相機

並列摘要

This study developed a novel measurement force platform in which the restoring force of the traditional spring is replaced by an axial magnetic attraction force and improved the linearity of the axial magnetic attraction force-displacement curve via the addition of two yokes.
The proposed structure has been applied to a novel VCM actuator with open-loop position control mechanism of cell phone camera module that is featured with absence of spring plates. The performance of the proposed structure is characterized numerically by means of simulations and then verified experimentally using a prototype. The results show that the proposed force sensor has a higher linearity of the axial magnetic attraction force-displacement curve and a novel cell phone camera module using the proposed structure is demonstrated with an improved power efficiency.

並列關鍵字

magnetic attraction force ； linearity ； cell phone camera module

參考文獻

[57] 劉建聖，“微型音圈馬達自動對焦致動器的設計與其光學性能分析Design of Miniaturized Auto-Focusing VCM Actuators and Analysis of Their Optical Performances,”國立成功大學機械工程學系，博士論文2010。

[2] 李鴻飛，“利用磁預壓力之微型音圈馬達自動對焦器設計 Design of Miniaturized Auto-Focusing VCM Actuators with Using Pre- Compression Magnet Force,” 國立中正大學機械工程學系，碩士論文，2014。

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