| 摘要 |
<p>An optical disk reproduction apparatus according to the present invention is an optical disk reproduction apparatus capable of reading information from the NBCA of an optical disk 101 having an NBCA, and includes: an optical pickup 103 having an objective lens 120 for converging a light beam onto the optical disk 101, a lens actuator 170 for controlling a position of the objective lens 120, and a photodetector for generating an electrical signal from at least a portion of the light beam having been reflected by the optical disk 101; a transport mechanism 106 for moving the optical pickup 103 along a radial direction of the optical disk; and an NBCA in/out determination section 104 for, based on electrical signal, determining whether an irradiated position of the light beam on the optical disk 101 is located within the NBCA or not. When reading information from the NBCA, it executes: step A of, by using the transport mechanism 106, moving the optical pickup 103 from a first pickup position to a second pickup position which is close to the disk center; step B of, by using the lens actuator 170, placing the objective lens 120 consecutively at a plurality of positions within the optical pickup 103 being at the second pickup position; and step C of, by using the NBCA in/out determination section 104, determining whether an irradiated position on the optical disk 101 of the light beam converged by the objective lens 120 is located within the NBCA or not.</p> |
