Reading method of optical disc drive for reading disc and finding if disc is placed reversely
View Patent ↗A reading method for finding if a disc is placed reversely used in an optical disc drive is provided. The optical disc drive has a spindle motor, an optical pickup head having a lens, a fine actuator and a sled actuator. Firstly, a disc is placed into the optical disc drive. Next, the spindle motor rotates the disc. After that, a laser light of the optical pickup head is shot on the disc. Next, the lens is moved such that the laser light follows a single data track. Then, a central error signal of the lens is measured continuously. Afterwards, if the central error signal increases progressively, the optical disc drive finds the disc placed reversely, and the disc is ejected from the optical disc drive.
1. A reading method for finding if a disc is placed reversely used in an optical disc drive, wherein the optical disc drive has a spindle motor, an optical pickup head, a fine actuator and a sled actuator, the optical pickup head has a lens, the reading method of finding if a disc is placed reversely comprises the steps of:
placing a disc into the optical disc drive;
driving the spindle motor to rotate the disc;
shooting a laser light of the optical pickup head on the disc;
moving the lens such that the laser light follows a single data track of the disc;
continuously measuring a central error (CE) signal of the lens; and
finding that the disc is placed reversely if the level of the central error signal increases progressively.
2. The reading method for finding if a disc is placed reversely according to claim 1 , wherein the lens is disposed on the fine actuator.
3. The reading method for finding if a disc is placed reversely according to claim 1 , wherein the central error signal denotes an error between a current position and a natural position of the lens.
4. The reading method for finding if a disc is placed reversely according to claim 1 , wherein if the level of the central error signal decreases progressively, the optical disc drive finds that the disc is placed correctly and continues to read data from the disc.
5. The reading method for finding if a disc is placed reversely according to claim 1 further comprises the step of ejecting the disc from the optical disc drive if the level of the central error signal increases progressively.
6. The reading method for finding if a disc is placed reversely according to claim 1 further comprises the step of moving the optical pickup head to inner tracks of the disc before shooting the laser light of the optical pickup head on the disc.
7. A reading method of an optical disc drive used for reading a disc placed therein, wherein the optical disc drive has an optical pickup head which has a lens, the reading method of an optical disc drive comprises the steps of:
rotating the disc;
shooting a laser light of the optical pickup head on the disc;
moving the lens such that the laser light follows a single data track of the disc;
continuously measuring a central error (CE) signal of the lens; and
ejecting the disc from the optical disc drive if the level of the central error signal increases progressively.
8. The reading method of an optical disc drive according to claim 7 , wherein the central error signal denotes an error between a current position and a natural position of the lens.
9. The reading method of an optical disc drive according to claim 7 , wherein if the level of the central error signal decreases progressively, the optical disc drive continues to read data from the disc.
10. The reading method of an optical disc drive according to claim 7 further comprises the step of moving the optical pickup head to inner tracks of the disc before shooting the laser light of the optical pickup head on the disc.