Laser drive integrated circuit and optical disk apparatus using the same
January 29, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLaser power calibration by measuring laser drive current at out of focus and in focus conditions Method of and apparatus for correcting edge interval of pit in optical recording/read-out apparatus Magneto-optical recording system using recording waveform having a plurality of power levels providing high recording density Controller and control method of laser power for recording information in an optical record medium Disc recording and/or reproducing apparatus Optical disk apparatus Calibrating optical disk lasers using a minimal amount of write-once data storage space Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head Patent #: 6154433 Inventors
AssigneeApplicationNo. 239516 filed on 01/29/1999US Classes:369/59.11, Binary signal processing for controlling recording light characteristic369/47.53, Stored and retrieved testing signal369/53.2, Of record carrier369/116Light intensity adjustment or maintenanceExaminersPrimary: Young, W. R.Assistant: Chu, Kim-Kwok Attorney, Agent or FirmForeign Patent References
International ClassesG11B 007/004.5G11B 007/125 Foreign Application Priority Data1998-02-02 JPAbstractA laser drive integrated circuit and an optical disk apparatus using the laser drive integrated circuit for forming high-density marks. The optical disk apparatus has a drive waveform information storage unit for storing at least one information of the drive waveform for driving a laser diode in response to a binary recording signal recorded in a recording medium and a drive waveform decoder for decoding the drive waveform based on the information stored in the drive waveform information storage unit. The recording strategy can be changed in accordance with the variations and fluctuations of recording media or the characteristics of the recording media, while at the same time reducing the number of signal lines of flexible wiring and alleviating the effect of the signal distortion.Field of SearchLight intensity adjustment or maintenanceRate, phase, or transient processing Plural distinct diffractive optical elements Servo loop gain/switching control Plural distinct polarized optical elements Structure for shaping beam or causing astigmatic condition Plural incident beams Of record carrier Recording mark dimension Stored and retrieved testing signal Power control for energy producing device Binary signal processing for controlling recording light characteristic | |
