| 摘要 |
The invention relates to an apparatus for reading an optical record carrier. During a search mode when an optical read unit is rapidly moved in a radial direction. By means of a control circuit a servo control loop is rendered operative and inoperative by a control circuit in accordance with a predetermined periodic pattern. By means of a deflection element in the optical read unit, the servo control loop controls the scanning position of the read spot on the record carrier. During a fast search operation, the control circuit defines the operative period of the servo control loop in such a way that the address signals recorded in the vertical flyback periods of the video signal are read with a high reliability. |
