Apparatus and method for reproducing data from multi-layered...

G - Physics – 11 – B

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G11B 7/09 (2006.01) G11B 7/085 (2006.01) G11B 7/24 (2006.01) G11B 7/00 (2006.01)

Patent

CA 2164929

To move an object lens out of focalization on a layer and to accelerate it upwardly, a drive signal DRV is set HIGH, and a focus OPEN signal is set LOW. After a value a counter exhibits at this time is held in a register T1, the counter is reset at zero. Then a value the counter exhibits upon FZC+ being LOW is held in a register T2A, and a value the counter exhibits upon FZC- being HIGH is held in a register T2B. The value of a register T3 is calculated from T1 and the average of T2A and T2B, and when the counter value becomes equal to the sum of T1 and T3, DRV is set HIGH. After FZC- becomes LOW, OPEN is set HIGH, and the focus jump operation is completed.

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