There is much research being conducted on developing information storage devices based on formats of Blu-ray Disc (BD) and HD-DVD with requirements for high-density storage devices. This trend is set toward the use of a short-wave length laser and objective lens (OL) with high numerical aperture in optical storage devices. However, it causes the rapid decrease of tilt margin. Therefore, it is necessary that an actuator control tilt motion and have fast access tune to get a stable signal. In this paper, a mathematical form of a three-degrees-of-freedom (DOF) coupled model was formulated and magnetic circuit in mechanical constraints was efficiently designed through at trial-and-error method using electromagnetic (EM) analysis. Finally, in order to have fast access time, a three-axis actuator whose rotational center is put on a lens center through redesign of tilting magnetic circuit was suggested. This design targets were evaluated by experiments.
Bibliographical noteFunding Information:
Manuscript received August 31, 2004. This work was supported by the Korea Science and Engineering Foundation (KOSEF) through the Center for Information Storage Device, Yonsei University under Grant R11-1997-006101-0. The authors are with the Center for Information Storage Devices (CISD), Yonsei University, Seoul 120-749, Korea (e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org; email@example.com). Digital Object Identifier 10.1109/TMAG.2004.842028 Fig. 1. Changes of focal point as rotational center. (a) Before tilting motion. (b) Tilting motion not considering rotational center. (c) Tilting motion considering rotational center.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering