Optical disk device

Details Optical disk device Optical disk device

2011-05-03

2011-05-03

Pardo, Thuy N (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053230, C369S044350, C369S053280

Reexamination Certificate

active

07936654

ABSTRACT:
An optical disk device includes an optical pickup, a focus drive section, a detection section, a time measurement section and a disk identification section. The detection section detects reflected light reflected from an optical disk while the focus drive section moves a focus position of the optical pickup. The time measurement section measures a focus search time between when the reflected light reflected from a disk surface of the optical disk is detected and when the reflected light reflected from an information recording layer of the optical disk is detected. The time measurement section measures a false reflection search time between when the reflected light reflected from the disk surface is detected and when false reflection light is detected. The disk identification section calculates a ratio of the focus search time to the false reflection search time, and identifies a type of the optical disk based on the ratio.

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