An optical information recording-reproducing method and an apparatus using the method
In an optical information recording-reproducing apparatus or method, a sum signal is generated from a divided sensor to be used for auto-focus (AF) and/or auto-tracking (AT) control. The AF servo is closed after an objective lens is moved to a location in the neighborhood of an in-focus position whi...
Saved in:
Main Author | |
---|---|
Format | Patent |
Language | English French German |
Published |
11.11.1998
|
Edition | 6 |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | In an optical information recording-reproducing apparatus or method, a sum signal is generated from a divided sensor to be used for auto-focus (AF) and/or auto-tracking (AT) control. The AF servo is closed after an objective lens is moved to a location in the neighborhood of an in-focus position while working a position servo for an objective lens actuator using the sum signal. Further, the fact that a light spot is on a track is detected from the sum signal. If this fact is detected as well as the fact that a tracking error signal is in the neighborhood of zero, the AT servo is closed. |
---|---|
Bibliography: | Application Number: EP19930301361 |