Enhancement of PZT embedded swing arm actuator using integrated read/write performance and actuation

• Published in: Microsystem technologies : sensors, actuators, systems integration actuators, systems integration, 2012-04, Vol.18 (4), p.437-442
• Main Authors: Lin, Yu-Cheng, Chou, Po-Chien, Cheng, Stone
• Format: Article
• Language: English
• Subjects: Applied sciences; Electronics; Electronics and Microelectronics; Engineering; Exact sciences and technology; General equipment and techniques; Instrumentation; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic and optical mass memories; Mechanical Engineering; Nanotechnology; Physics; Storage and reproduction of information; Technical Paper; Transducers
• ISSN: 0946-7076; 1432-1858
• DOI: 10.1007/s00542-012-1446-8

The current technological challenges associated with the rotary-type seesaw arm actuator for small-form-factor (SFF) disk drives are the small skew focusing, which causes off-axis aberrations and reduces optical quality. This article develops a novel design for a seesaw arm actuator and suspension assembly that is based on a micro-PZT actuator to position pickup head. Dual-stage actuation relaxes the dynamic requirement on the focusing stroke. The proposed actuator with a tilt-compensation mechanism uses a PZT bender to drive pickup head focusing. This combined system, optical module and dual stage actuator, is effectively self-aligned the optical axis for read/write performance in both experiment and simulation result. Finite element modeling and dynamic measurements reveal significant improvements in the actuator bandwidth with and without micro-PZT actuator compensation.