Abstract: This patent specification describes a novel optical information recording method for recording mark and space information. The method for recording optical information comprises the steps of generating a peak level current waveform having a high level, generating a bias level current waveform having a low level generating a normal boost level current waveform and a low boost level current waveform, driving a laser light source with the normal boost level current waveform superimposed on the low level current waveform in a normal boost level light emission and switching a drive current waveform for the laser light source to the low boost level current waveform superimposed on the low level current waveform in a peak level sampling operation.

Abstract: A method and apparatus for recording information with improved capabilities of suitably updating numerous setting items addressing the change in recording velocity of an optical disc caused during information recording. The method for recording on the surface of the optical recording disc by a laser beam emanated from a light source, comprises, in case when a recording velocity changes during an operation of recording information, the step of selecting setting items out of a plurality of items, in which the setting items may affect to a degrade recording quality with the change in the recording velocity and the plurality of items are used for determining the shape of pulsating laser beam; identifying a set of the items to be updated including the setting items; and updating the set item by item to values suitable for the present recording velocity at a predetermined time interval while continuing the operation of recording information.

Abstract: An optical information recording apparatus for recording information on an optical information recording medium with multiple recording layers is disclosed. The optical information recording apparatus, performing an OPC operation before performing the recording, includes a reading part reading information on the type of the medium recorded thereon, a storage unit storing information on a recording condition at the time of performing the OPC operation for each recording layer with respect to each medium type, a recording condition obtaining part reading out the recording condition corresponding to the read type when the recording condition is stored in the storage unit, and reading the recording condition recorded in a corresponding one of the recording layers recording their respective recording conditions when the recording condition is not stored in the storage unit, and an OPC performance part performing the OPC operation using the obtained recording condition.

Abstract: An optical information recording method records information with respect to an optical information recording medium having a multi-layer structure recording layer formed by a plurality of recording layers each capable of recording information, and carries out an Optimum Power Control (OPC) prior to carrying out the recording. Recording conditions that are used when carrying out the OPC are read from one of the recording layers of the optical information recording medium to which the recording is to be made, where each of the recording layers is recorded with the recording conditions therefor, and the OPC is carried out using the read recording conditions.

Abstract: A laser power control apparatus for controlling the output power of a semiconductor laser used to record and reproduce data in and from a recording medium is provided. The laser power control apparatus includes a controller configured to vary the peak output power level of the semiconductor laser in a stepwise manner, calculate a differential efficiency at each of the varied peak output power levels, and determine a laser driving current based on a relation between the differential efficiency and the peak output power level. In addition, a laser driving unit is configured to drive the semiconductor laser using the laser driving current determined by the controller.

Abstract: A laser power control apparatus for controlling the output power of a semiconductor laser used to record and reproduce data in and from a recording medium is provided. The laser power control apparatus includes a controller configured to vary the peak output power level of the semiconductor laser in a stepwise manner, calculate a differential efficiency at each of the varied peak output power levels, and determine a laser driving current based on a relation between the differential efficiency and the peak output power level. In addition, a laser driving unit is configured to drive the semiconductor laser using the laser driving current determined by the controller.

Abstract: An optical information recording apparatus for recording information on an optical information recording medium with multiple recording layers is disclosed. The optical information recording apparatus, performing an OPC operation before performing the recording, includes a reading part reading information on the type of the medium recorded thereon, a storage unit storing information on a recording condition at the time of performing the OPC operation for each recording layer with respect to each medium type, a recording condition obtaining part reading out the recording condition corresponding to the read type when the recording condition is stored in the storage unit, and reading the recording condition recorded in a corresponding one of the recording layers recording their respective recording conditions when the recording condition is not stored in the storage unit, and an OPC performance part performing the OPC operation using the obtained recording condition.

Abstract: In an optical recording/reproducing apparatus of the present invention, a semiconductor laser driver supplies a selected one of a plurality of drive currents, including at least a first-level drive current and a second-level drive current, to a semiconductor laser to control the emission of a laser beam by the laser. A current driver selectively outputs one of a plurality of increment currents to the laser driver in response to control signals, the plurality of increment currents including a first increment current supplied to the laser driver during an automatic power control process and a second increment current supplied to the laser driver during a special power setting process.

Abstract: An optical information recording apparatus for recording information on an optical information recording medium with multiple recording layers is disclosed. The optical information recording apparatus, performing an OPC operation before performing the recording, includes a reading part reading information on the type of the medium recorded thereon, a storage unit storing information on a recording condition at the time of performing the OPC operation for each recording layer with respect to each medium type, a recording condition obtaining part reading out the recording condition corresponding to the read type when the recording condition is stored in the storage unit, and reading the recording condition recorded in a corresponding one of the recording layers recording their respective recording conditions when the recording condition is not stored in the storage unit, and an OPC performance part performing the OPC operation using the obtained recording condition.

Abstract: In an optical recording/reproducing apparatus of the present invention, a semiconductor laser driver supplies a selected one of a plurality of drive currents, including at least a first-level drive current and a second-level drive current, to a semiconductor laser to control the emission of a laser beam by the laser. A current driver selectively outputs one of a plurality of increment currents to the laser driver in response to control signals, the plurality of increment currents including a first increment current supplied to the laser driver during an automatic power control process and a second increment current supplied to the laser driver during a special power setting process.

Abstract: A method and apparatus for recording information with improved capabilities of suitably updating numerous setting items addressing the change in recording velocity of an optical disc caused during information recording. The method for recording on the surface of the optical recording disc by a laser beam emanated from a light source, comprises, in case when a recording velocity changes during an operation of recording information, the step of selecting setting items out of a plurality of items, in which the setting items may affect to a degrade recording quality with the change in the recording velocity and the plurality of items are used for determining the shape of pulsating laser beam; identifying a set of the items to be updated including the setting items; and updating the set item by item to values suitable for the present recording velocity at a predetermined time interval while continuing the operation of recording information.

Abstract: An optical information recording method records information with respect to an optical information recording medium having a multi-layer structure recording layer formed by a plurality of recording layers each capable of recording information, and carries out an Optimum Power Control (OPC) prior to carrying out the recording. Recording conditions that are used when carrying out the OPC are read from one of the recording layers of the optical information recording medium to which the recording is to be made, where each of the recording layers is recorded with the recording conditions therefor, and the OPC is carried out using the read recording conditions.

Abstract: This patent specification describes a novel optical information recording method for recording mark and space information. The method for recording optical information comprises the steps of generating a peak level current waveform having a high level, generating a bias level current waveform having a low level generating a normal boost level current waveform and a low boost level current waveform, driving a laser light source with the normal boost level current waveform superimposed on the low level current waveform in a normal boost level light emission and switching a drive current waveform for the laser light source to the low boost level current waveform superimposed on the low level current waveform in a peak level sampling operation.

Abstract: An optical information recording method records information with respect to an optical information recording medium having a multi-layer structure recording layer formed by a plurality of recording layers each capable of recording information, and carries out an Optimum Power Control (OPC) prior to carrying out the recording. Recording conditions that are used when carrying out the OPC are read from one of the recording layers of the optical information recording medium to which the recording is to be made, where each of the recording layers is recorded with the recording conditions therefor, and the OPC is carried out using the read recording conditions.

Abstract: In an optical recording/reproducing apparatus of the present invention, a semiconductor laser driver supplies a selected one of a plurality of drive currents, including at least a first-level drive current and a second-level drive current, to a semiconductor laser to control the emission of a laser beam by the laser. A current driver selectively outputs one of a plurality of increment currents to the laser driver in response to control signals, the plurality of increment currents including a first increment current supplied to the laser driver during an automatic power control process and a second increment current supplied to the laser driver during a special power setting process.

Abstract: An optical information recording method records information with respect to an optical information recording medium having a multi-layer structure recording layer formed by a plurality of recording layers each capable of recording information, and carries out an Optimum Power Control (OPC) prior to carrying out the recording. Recording conditions that are used when carrying out the OPC are read from one of the recording layers of the optical information recording medium to which the recording is to be made, where each of the recording layers is recorded with the recording conditions therefor, and the OPC is carried out using the read recording conditions.

Abstract: An optical information recording apparatus for recording information on an optical information recording medium with multiple recording layers is disclosed. The optical information recording apparatus, performing an OPC operation before performing the recording, includes a reading part reading information on the type of the medium recorded thereon, a storage unit storing information on a recording condition at the time of performing the OPC operation for each recording layer with respect to each medium type, a recording condition obtaining part reading out the recording condition corresponding to the read type when the recording condition is stored in the storage unit, and reading the recording condition recorded in a corresponding one of the recording layers recording their respective recording conditions when the recording condition is not stored in the storage unit, and an OPC performance part performing the OPC operation using the obtained recording condition.

Abstract: A laser power control apparatus for controlling the output power of a semiconductor laser used to record and reproduce data in and from a recording medium is provided. The laser power control apparatus includes a controller configured to vary the peak output power level of the semiconductor laser in a stepwise manner, calculate a differential efficiency at each of the varied peak output power levels, and determine a laser driving current based on a relation between the differential efficiency and the peak output power level. In addition, a laser driving unit is configured to drive the semiconductor laser using the laser driving current determined by the controller.

Abstract: There are times when an abnormal light emission occurs and damage the medium when updating the setting register of the pulse width or the laser driving current during recording operation in an optical information recording and reproducing device. There are thus provided a plurality of pulse width setting registers for setting the pulse width of the multi-pulse emissions. When updating the pulse width of the multi-pulse, the pulse width setting register is changed and then the recording operation is performed, and at the time to change the pulse width setting register during recording, the generation of recording pulse train is stopped.

Abstract: There are times when an abnormal light emission occurs and damage the medium when updating the setting register of the pulse width or the laser driving current during recording operation in an optical information recording and reproducing device. There are thus provided a plurality of pulse width setting registers for setting the pulse width of the multi-pulse emissions. When updating the pulse width of the multi-pulse, the pulse width setting register is changed and then the recording operation is performed, and at the time to change the pulse width setting register during recording, the generation of recording pulse train is stopped.