A PZT type-optical pickup actuator for small form factor optical disk drive : 초소형 광디스크 드라이브용 압전형 광 픽업 액츄에이터 연구

다국어 초록 (Multilingual Abstract)

A small size pick-up actuator using a bimorph multilayer PZT is studied in this paper for the application of slim and small form factor optical disk drives. A theoretical model includes the dynamics of several piezoelectric, electrode and substrate layers and it is analytically solved to predict the natural frequency, the resultant force and the maximum displacement of the PZT actuator. A flexure hinge mechanism is used as the displacement amplifier to extend the allowable stroke. The prototype of proposed model was manufactured using commercial multilayer PZT. Experimental results agree well with the analytical predictions. Based on the theoretical analysis and the preliminary experiments, we propose a final model for a new PZT pick-up actuator with 2.5-mm height, which can be applicable to small form factor optical disk drives.

목차 (Table of Contents)

• List of Contents = ⅰ
• List of Contents = ⅰ
• List of Tables = ⅳ
• List of Figures = ⅴ
• Abstract = ⅸ
• 1. Introduction = 1
• 1.1 Research introduction = 1
• 1.2 Related Researches = 2
• 2. Optical pickup actuator = 7
• 2.1 Types and feature of Optical pickup actuator = 10
• 2.2 Dynamic modeling of Optical pickup actuator = 13
• 2.3 Experiment about vibration mode of Optical slim pickup actuator = 18
• 3. Piezoelectric actuator = 21
• 3.1 Piezoelectric Properties = 21
• 3.2 Static modeling of the bimorph PZT actuator = 26
• 3.2.1 Modeling of the bimorph single-layer PZT actuator = 29
• 3.2.2 Modeling of the bimorph multi-layer PZT actuator = 32
• 3.3 Mode analysis of the bimorph multi-layer PZT actuator = 36
• 3.3.1 Euler-Bernoulli beam theory = 36
• 3.3.2 Timoshenko beam theory = 43
• 3.4 Dynamic modeling of the bimorph PZT actuator = 55
• 3.5 Optimal design of the bimorph multi-layer PZT actuator = 60
• 3.5.1 Comparison with the theory, ANSYS analysis and experiment = 60
• 3.5.2 Optimal design according to geometry of multi-layer PZT actuator = 71
• 4. Flexural hinge mechanism for stroke amplifier = 76
• 4.1 The Flexural hinge mechanism = 76
• 4.2 Basic design analysis of the flexural hinge mechanism = 78
• 4.3 Experimental analysis of stroke amplifier model = 81
• 5. Applications to optical pickup actuator = 96
• 5.1 Applications of the PZT actuator = 97
• 5.2 Optical pickup actuator using the PZT actuator = 102
• 6. Conclusions = 107
• 7. References = 108