| 摘要 |
An optical disc apparatus for detecting information recorded in a rotating optical disc by using a laser beam, and reproducing data has a first light receiving cell (101) and a second light receiving cell (102) both of which divide and detect a reflected light or transmitted light from the optical disc, a phase difference between two signals output from these light receiving cells (101, 102) is detected by a phase difference detecting circuit (105) and this phase difference signal is integrated by a integrating circuit (106) to perform tracking control by servo controller (37) based on the integrated signal. At this time, the apparatus has a masking circuit for masking a signal to be supplied from the light receiving cells (101, 102) to the phase difference detecting circuit (105), particularly a signal having a short data length depending on a detection status of the signal obtained from the optical disc. |
