Abstract
In an optical disc system, the performances of read and write characteristics were deteriorated because the disc inclined to the optical pick-up that called disk tilting. In order to improve its characteristics, a method that rotates the objective lens to keep with parallel to slanted disc was developed. This paper describes rotation stiffness of actuator and its dominant parameters such as length and diameter of suspension spring and radius of rotation. Furthermore, we discuss the difference of deflection amount in conventional actuator. And then, it proposes new method that prevents compressive force from acting a specific suspension spring that support the object lens and its holder. As a result, compressive force did not act to a specific suspension springs because the all suspension springs were arrayed same radius of rotation. Therefore, stiffness of suspension spring keeps positive because its stiffness will be increase as its deflection increase.
