Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2007-05-29
2007-05-29
Patel, Gautam R. (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044320
Reexamination Certificate
active
10700471
ABSTRACT:
An apparatus and method for detecting a tilted disc, and an apparatus and method for reproducing data from the tilted disc are provided. The method for detecting a tilted disc comprises: radiating light on a predetermined location at the inner circumference of an optical disc and moving a pickup away from the optical disc; measuring a time T1at which a focus error signal, generated when light is reflected from a recording layer of the optical disc, is output; radiating light on a predetermined location at the outer circumference of the optical disc and moving the pickup unit away from the optical disc; measuring a time T2when a focus error signal, generated when light is reflected from the recording layer of the optical disc, is output; determining a tilt degree indicating value T which is a value for determining whether the optical disc is a tilted disc, using the measured times T1and T2; and comparing the tilt degree indicating value T with a predetermined reference value R and determining whether the optical disc is a tilted disc.
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English Translation of Korean Office Action.
Patel Gautam R.
Staas & Halsey , LLP
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