Lens Position Control System Using Limited Pole Placement Method

カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門（英文）

発行日: 2017/03/01

タイトル(英語): Lens Position Control System Using Limited Pole Placement Method

著者名: Yoshiyuki Urakawa (Sony Semiconductor Solutions corporation)

著者名(英語): Yoshiyuki Urakawa (Sony Semiconductor Solutions corporation)

キーワード: camera module，autofocus，lens position control，limited pole placement method，feedforward control

要約(英語): Recently, image sensors for mobile phones have significantly improved, and lens position control is needed for the autofocus actuator of the mobile camera module to realize a robust and precise focus system. The lens position control system is a highly resonant system because the lenses are held by small springs in narrow spaces. In this paper, a digital servo controller for the mobile camera module is discussed. First, continuous control systems are studied for various servo bandwidths with respect to the resonant frequency. Next, three pole assignment methods, 1) multiple poles, 2) a coefficient diagram method, and 3) an optimal controller, are discussed. Third, the limited pole placement method is applied to design a digital controller to suppress the vibration that comes from delay of a system. Finally, a feedforward controller is also investigated to obtain a smooth response for the reference signal. We confirmed that the highly resonant system can be controlled smoothly enough for autofocusing, using the limited pole placement method and the feedforward controller.

本誌: IEEJ Journal of Industry Applications Vol.6 No.2 （2017） Special Issue on Motion Control and its Related Technologies

本誌掲載ページ: 117-123 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/6/2/6_117/_article/-char/ja/