Abstract

Optical discs are widely used in data processing systems as well as products such as compact disc and video disc systems. Now, rapid progress is being achieved in terms of the data capacity and rewritability. However,one of the major unsolved problems today is the slow data transfer and tracking access when compared with those of magnetic disc systems. This is because optical discs employ dual actuators called coarse and fine actuator respectively. Each actuator utilizes mechanical components such as galvano mirrors. These components have a slow response time and take more than 20 ms to become stable, because of vibration. It is difficult to remove the mechanical components from the coarse actuator. However, they can be removed from the fine actuator.

© 1989 Optical Society of America