Write based power adaptive control system
AssigneeLSI Corporation
InventorsAinobu Yoshimoto, Hung Phi Dang
Life of this patent
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Abstract
An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to (i) generate a read power signal and (ii) control power of a laser beam emitted from an optical pick-up circuit during a read process. The second circuit may be configured to (i) generate a first write power signal and (ii) control one or more power levels of the laser beam during a write process in response to a second write power signal. The third circuit may be configured to generate the second write power signal and a third write power signal in response to a target write signal.
Claims21
An apparatus comprising:
- a first circuit configured to (i) generate a read power signal and (ii) control power of a laser beam emitted from an optical pick-up circuit during a read process;
- a second circuit configured to (i) generate a first write power signal and (ii) adjust said first write power signal in response to a second write power signal and said read power signal, wherein said adjusted first write power signal controls a power level of said laser beam during a write process;
- and
- a third circuit configured to generate said second write power signal and a third write power signal in response to a target write signal.
A method for controlling a write based power adaptive control system, comprising the steps of:
- (A) generating a read power signal;
- (B) controlling power of a laser beam emitted from an optical pickup unit during a read process;
- (C) generating a first write power signal;
- (D) adjusting said first write power signal in response to a second write power signal and said read power signal, wherein said adiusted first write power signal controls a power level of said laser beam during a write process;
- and
- (E) generating said second write power signal and a third write power signal in response to a target write signal.
An apparatus comprising:
- a first circuit configured to (i) generate a read power signal and (ii) control power of a laser beam emitted from an optical pick-up circuit during a read process;
- a second circuit configured to (i) generate a first write power signal and (ii) adjust said first write power signal by a fixed predetermined amount in response to a second write power signal and said read power signal if (a) a target write signal has not changed and (b) an average of said second write power at a beginning of a write process is greater than a second average of said second write power signal;
- and
- a third circuit configured to (i) generate said second write power signal and a third write power signal in response to said target write signal and (ii) control one or more power levels of said laser beam during said write process in response to a laser power sensor output.
Dependencies are inferred from the claim text.