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AssigneeMediatek Incorporation
InventorsHung-Hsiang Chang, Fu-Shan Wang
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A method used in an optical storage device having a pickup head. The pickup head includes an object lens, a first and a second light source. The object lens focuses the laser light generated by the first or the second light source onto a first or a second focal point. A driving control effort is used to change the location of the object lens. The method includes the following steps: providing the driving control effort to move the object lens; measuring a first parameter when the first focal point passes through a predetermined layer of an optical disc; measuring a second parameter when the second focal point passes through the predetermined layer of the optical disc; and (d) determining the relationship between the difference of object lens location and the driving control effort according to the predetermined distance, the first parameter, and the second parameter.
A method used in an optical storage device comprising a pickup head, wherein the pickup head comprises an object lens, a first light source, and a second light source, the object lens focuses laser light generated by the first light source onto a first focal point or focuses laser light generated by the second light source onto a second focal point, the first focal point is a predetermined distance from the second focal point, a driving control effort is used to change a location of the object lens, and the method is used to determine a relationship between the difference of the object lens location and the driving control effort, the method comprising:
An optical storage device comprising:
Dependencies are inferred from the claim text.