| 摘要 |
It is highly precisely determined as to whether or not a laser-irradiated position on an optical disk is positioned within an identification area (BCA) in which identification information is recorded, and the position of the identification information area is efficiently determined. An optical disk apparatus includes an optical pickup for detecting reflected light from an optical disk and generating a light amount signal, and a detecting section for outputting a detection signal which is in accordance with a change in the signal level of the light amount signal, the detection signal indicating that the change has continued for a first predetermined time or longer. Furthermore, the optical disk apparatus includes a pulse signal output section which, each time the detection signal is output, outputs a pulse signal which continues for a second predetermined time, and an area determination section which determines whether an irradiated position of light is within the identification area or not based on a continuing duration of the pulse signal.
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