Optical disk drive that can adjust erase power during writing operation
AssigneeTEAC Corporation
InventorsToshiki Shimizu, Akira Mashimo
Life of this patent
Estimating the term…
Abstract
An optical disk drive that can automatically adjust an erase power to an appropriate level to keep the error rate low and not to shorten the life of an erasable optical disk. The optical disk drive obtains a reference erasing modulation factor using a test area of the erasable optical disk when the disk is set. While overwriting data in the erasable optical disk, the optical disk drive obtains an erasing modulation factor based on the read signal detected in an erased region from time to time to adjust the erase power so that the erase power continually adjusted to the appropriate level.
Claims20
An optical disk drive that records a signal in an optical disk and reproduces said signal from said optical disk by applying a laser beam to said optical disk, comprising:
- detecting unit that evaluates quality of the reproduced signal during a writing operation;
- and
- power controlling unit that adjusts, during said writing operation, power of said laser beam applied to said optical disk in response to said quality of the reproduced signal evaluated by said detecting unit.
An optical disk drive that can overwrite a signal in an erasable optical disk, comprising:
- a controller that determines an optimum write power of said optical disk drive when said erasable optical disk is set in said optical disk drive, writes a test signal in a test area of said erasable optical disk using said optimum write power, and reproduces said test signal,
- wherein said controller further determines a reference erasing modulation factor by detecting a first peak value and a first bottom value of the test signal reproduced in a first region of said erasable optical disk, said first region being erased using an erase power, writes data signals in a recording area of said erasable optical disk, reproduces said data signals, obtains an erasing modulation factor by detecting a second peak value and a second bottom value of said data signals reproduced in a second region of said erasable optical disk, said second region being erased using said erase power, and adjusts said erase power so that said erasing modulation factor approaches said reference erasing modulation factor.
An optical disk drive that records a signal in an optical disk and reproduces said signal from said optical disk by applying a laser beam to said optical disk, comprising:
- a power monitor that detects power of said laser beam;
- a power controller that adjusts said power of said laser beam in response to said power detected by said power monitor;
- and
- a system controller that reproduces, during a writing operation, said signal recorded in said optical disk, evaluates quality of said signal reproduced from said optical disk, and causes said power controller to adjust said power of said laser beam using said quality of the reproduced signal.
Dependencies are inferred from the claim text.