Abstract

The high track bit density used in the OPL optical disk drive requires a high resolution tracking system as well as a similarly high resolution focus servo system. The total capacity of the drive dictates a range of linear travel for the readout objective lens in the tracking axis which makes high precision with a single stage tracking servo actuator very difficult. Therefore the high resolution servo motors have been combined into a single two axis linear servo motor assembly. A coarse tracking servo motor provides gross tracking motion. This paper describes the development, design, and performance of the two axis linear servo motor assembly, which will be referred to as the Fine Servo Motor or F.S.M.

© 1984 Optical Society of America