4C12 A Seesaw Swivel Type Actuator with New Magnetic Array Design

Abstract

We present a new type actuator though the swing type arm was as a reference of small form factor optical pickup heads that had already utilized the material of piezoelectricity or slim plate of metal to perform focusing action. The seesaw type actuator is a new driving mechanism used for swiveling the small form devices. The configuration of the seesaw swivel actuator has unique features including a rotary supporting base for coarse and fine tracking, and a seesaw arm swivels along a pivot without a hinge to permit a tilted focus movement. Moreover, to achieve precision positioning of the seesaw actuator, a lateral focusing voice coil motor, which attached the middle seesaw arm, is proposed. In order to adjust the broad air gap between the tracking coil and the base magnet, a horizontal voice coil motor combined a ring type magnet provides uniform and uninterrupted magnetic output and the magnetic component is unlike multi-segmented magnet arrays form. The seesaw actuator was designed on the basis of finite element structural analyses for focus/tracking actuations and the dynamic characteristics were verified by this simulation. An original seesaw actuator with particular magnetic circuit was specifically manufactured and assembled for a micro ODD. Natural frequencies of seesaw swing arm are measured to confirm the results of finite element analyses. Furthermore, the parameters optimization procedure uses as design variables to optimize the initial model and improve the system response. The vital discussion is the New magnets array design