The design and establishment of focus servo module in the hybrid magneto-optical recording system are presented.

Research on the focus servo system due to the disc oscillation;

The focus servo system of the OM is analyzed and the mathematical model of the voice-coil motor is presented.

To implement dual-pickup-head multilayer data storage system,it is necessary to measure the synchronizing focus error of the two pickup heads to validate the feasibility of the focus servo method.

This paper deals with the open system of numerical control based on Windows98, mainly discussing the interface module , the manage module and the servo module.

This paper presents a technique on the control system constructing and the single-chip compute r programtheng of an auto-focusing servo laser micrometer.

To realize the focus servo-control,the circuit board of super-RENS optical storage system,which is based on the DSP chip of TMS320VC5409 and the CPLD chip of XC95144XL,is used,and the digital control algorithm is applied in this system.

We need to add the controller in order to enhance the control precision and response speed of DVD focus servo system,and then a new emendation arithmetic was put forward.