Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-11-16
1993-12-28
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369120, G11B 7085
Patent
active
052746224
ABSTRACT:
An apparatus for controlling an emission power of a laser diode is used in an apparatus for recording and reproducing information of an optical disk, which has a power calibration area and to which a disk discrimination code is recorded. The controlling apparatus is provided with: a power detection device for detecting an optimum recording power of the laser diode with respect to the optical disk to be recorded by use of the information reproduced from the power calibration area; a temperature detection device for detecting a temperature of the laser diode; a memory device for storing the optimum recording power detected by the power detection device, the temperature detected by the temperature detection device and the reproduced disk discrimination code; and a control device, to which the disk discrimination code reproduced at the present time is inputted, for comparing the temperature at the present time detected by the temperature detection device and the temperature stored in the memory device corresponding to the inputted disk discrimination code, and instructing the power detection device to detect the optimum recording power if the difference between the compared temperatures exceeds a predetermined value before a recording operation of the recording and reproducing apparatus.
REFERENCES:
patent: 5182742 (1993-01-01), Ohmori et al.
patent: 5193083 (1993-03-01), Yanagawa
Dzierzynski Paul M.
Pioneer Electronic Corporation
Wong Don
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