Optical disk recording and reproducing apparatus and tilt adjustment method therefor
AssigneeSanyo Electric Co., Ltd.
InventorNobuhiro Tatsuta
Life of this patent
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Abstract
A tilt adjustment method for an optical disk recording and reproducing apparatus in which a signal is recorded on or reproduced from a disk using an optical pickup. In an optical disk recording and reproducing apparatus which uses an optical pickup having a tilt adjustment coil for adjusting the tilt of an objective lens, the errors contained in a signal reproduced from the disk are counted each time the tilt voltage to be supplied to the tilt adjustment coil is changed. When an appropriate count value is obtained, the tilt voltage at this state is determined to be an optimum tilt voltage.
Claims18
An optical disk recording and reproducing apparatus comprising:
- an optical pickup including a tilt adjustment coil for adjusting a tilt of an objective lens;
- an error count circuit for counting the errors contained in a predetermined signal read from a disk by the optical pickup;
- and
- a control circuit for causing the optical pickup to read a signal from the disk and determining whether or not the number of errors in the read signal counted by the error count circuit during a unit of time satisfies a predetermined condition,
- wherein when the number of errors does not satisfy the predetermined condition, the control circuit changes a tilt voltage to be supplied to the tilt adjustment coil according to a rule and then again causes the optical pickup to read a signal from the disk for repeating the determination, and
- when the number of errors satisfies the predetermined condition, the control circuit sets the tilt voltage employed at that time as a tilt voltage for use when recording or reproducing a signal on or from the disk.
A tilt adjustment method in an optical disk recording and reproducing apparatus comprising an optical pickup including a tilt adjustment coil for adjusting a tilt of an objective lens, the method comprising the steps of:
- counting the errors in a predetermined signal which has been read from a disk by the optical pickup;
- determining whether or not the number of errors counted in the read signal satisfies a predetermined condition;
- when the number of errors does not satisfy the predetermined condition, changing a tilt voltage to be supplied to the tilt adjustment coil according to a predetermined rule and then causing the optical pickup to again read a signal from the disk in order to repeat the determination;
- and
- when the number of errors satisfies the predetermined condition, setting the associated tilt voltage as the tilt voltage for use in recording or reproducing a signal on or from the disk.
Dependencies are inferred from the claim text.