Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-07-25
2006-07-25
Wellington, Andrea (Department: 2652)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S274000, C346S137000
Reexamination Certificate
active
07082094
ABSTRACT:
An optical disk apparatus records information by irradiating a laser beam from a pickup onto an optical disk. A scanning section scans the laser beam relative to the optical disk. A recording control section controls the scanning section to effect recording of information. A drawing control section is provided for controlling the pickup and the scanning section to effect drawing of a visible image on the optical disk according to image information, such that the laser beam is changed between a first intensity incapable of acting on the optical disk and a second intensity capable of acting on the optical disk. A servo section periodically detects the laser beam reflected back from the optical disk when the laser beam has the first intensity, and servo-controls the irradiating of the laser beam during the drawing of the visible image based on the detection of the laser beam. The drawing control section controls the pickup for forcibly changing the laser beam to the first intensity from the second intensity when the second intensity is maintained over a predetermined period pursuant to the image information, thereby enabling the servo section to detect the laser beam having the first intensity for continuing the servo-control.
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Morishima Morito
Shiozaki Yoshihiko
Usui Akira
Chow Lixi
Pillsbury Winthrop Shaw & Pittman LLP
Wellington Andrea
Yamaha Corporation
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