OPTICAL DISC SYSTEM AND ASSOCIATED TILT ANGLE CALIBRATION METHOD
First Claim
1. An optical drive system comprising:
- an optical disc;
an object lens for focusing light on the optical disc;
a tilt servo for adjusting a tilt angle between the optical disc and the object lens;
an optical electric integrated circuit (OEIC) for detecting light reflected from the optical disc;
a DPD generator for generating a differential phase detection (DPD) signal according to the output of the OEIC; and
a tilt search block receiving the DPD signal and being connected to the tilt servo, wherein the tilt search block controls the tilt servo to adjust the tilt angle between the optical disc and the object lens according to the DPD signal.
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Accused Products
Abstract
A controllable tilt servo adjusts a tilt angle between an optical disc and an object lens according to a control signal from a CPU. An optical electric integrated circuit (OEIC) generates a differential phase detection (DPD) signal according to light received through the object lens from the optical disc. A tilt search block receives the DPD signal and controls the tilt servo by adjusting the tilt angle between the optical disc and the object lens according to the DPD signal. By iteratively scanning pluralities of tilt angles, each plurality of angles having decreasing angle differences and being centered on the tilt angle having the lowest amplitude DPD signal, an optimal tilt angle having the lowest amplitude DPD signal can be found.
47 Citations
14 Claims
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1. An optical drive system comprising:
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an optical disc;
an object lens for focusing light on the optical disc;
a tilt servo for adjusting a tilt angle between the optical disc and the object lens;
an optical electric integrated circuit (OEIC) for detecting light reflected from the optical disc;
a DPD generator for generating a differential phase detection (DPD) signal according to the output of the OEIC; and
a tilt search block receiving the DPD signal and being connected to the tilt servo, wherein the tilt search block controls the tilt servo to adjust the tilt angle between the optical disc and the object lens according to the DPD signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of calibrating the tilt angle between an optical disc and an object lens in an optical storage device, the method comprising the following steps:
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(a) providing a tilt servo for adjusting the tilt angle between the optical disc and the object lens;
(b) providing an optical electric integrated circuit (OEIC) for detecting light reflected from the optical disc;
(c) generating a differential phase detection (DPD) signal according to the output of the OEIC; and
(d) controlling the tilt servo to adjust the tilt angle between the optical disc and the object lens according to the DPD signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification