Error control processing method for CD drive track-finding servo

Abstract

At starting action for making optical header Track On, that is at time of changing Seeking Sevo system to Tracking Sevo system to control optical header, the Track On time begins to calculate. If the Track On time exceeds a preset time, action for making optical header Track On is quit. Next, activating central servo control system or vibrating the optical header in free frequency makes the optical header move to central position within movable region. Then, another Track On action is carried out.

Description

technical field [0001] The invention relates to a tracking servo control method of an optical drive, in particular to an error control and processing method of the tracking servo of the optical drive. Background technique [0002] Optical discs are fast random access (Random Access) storage media. In order to meet this requirement, the optical drive must be able to use the Seeking Servo to accurately send the Sledge to the target position at the fastest speed at any time, and then the Tracking Servo will take over. The Track On action of the optical head. However, under the dual requirements of speed and accuracy, the optical head will inevitably have many factors such as out of focus or excessive shaking, which will cause the slider to reach the target position but cannot lock the optical head on the target track in time. [0003] For example, refer to Figure 1A , which is a schematic diagram of the known track-locking action of the trolley and the optical head. General...

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Problems solved by technology

like figure 2 As shown, at time point 62, the optical head track-locking action is successful, but it has taken a long time (t), and if the design of the tracking servo

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