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    Laser power-drive circuit having a scaling DAC supplying a scaled reference signal to a plurality of scaled DAC's that supply a plurality of scaled output signals
    1.
    发明授权
    Laser power-drive circuit having a scaling DAC supplying a scaled reference signal to a plurality of scaled DAC's that supply a plurality of scaled output signals 失效
    具有缩放DAC的激光功率驱动电路为缩放的DAC提供缩放的参考信号，所述缩放的DAC提供多个缩放的输出信号

    公开(公告)号：US5640381A

    公开(公告)日：1997-06-17

    申请号：US612993

    申请日：1996-03-08

    申请人： David Ernest Call ,  Stephen J. Hrinya ,  Jerry Elden Hurst, Jr. ,  Glen Alan Jaquette ,  Anthony Juliana, Jr.

    发明人： David Ernest Call ,  Stephen J. Hrinya ,  Jerry Elden Hurst, Jr. ,  Glen Alan Jaquette ,  Anthony Juliana, Jr.

    IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B20/18 ,  H01S5/0683 ,  G11B7/00

    CPC分类号： G11B7/126 ,  H01S5/0683 ,  G11B20/182 ,  G11B7/0045

    摘要： An optical disk recorder employs laser drive signals having diverse current or power levels. A scaling digital-analog-converter (DAC) supplies a scaled reference signal to a plurality of scaled DACs. The scaled DACs supply the diverse laser drive signals. Calibrating the scaling DAC calibrates the scaled DACs. A base array of DACs include not only the scaling DAC but a plurality of base array DACs. Such base array DACs control reading operations as well as supplying a threshold current. The threshold current is that laser drive signal current level below which laser 25 does not emit a laser beam. During writing, the CUT current is added to the laser drive currents supplied by the scaled DACs. A desired CUT current is determined by calculating a slope of the laser drive current to emission of radiation. Then the slope is extrapolated to a zero emission point below which no coherent emission of radiation occurs.

    摘要翻译： 光盘记录器采用具有不同电流或功率电平的激光驱动信号。 缩放数字模拟转换器（DAC）将缩放的参考信号提供给多个缩放的DAC。 缩放的DAC提供多种激光驱动信号。 校准缩放DAC校准缩放的DAC。 DAC的基本阵列不仅包括缩放DAC，而且包括多个基本阵列DAC。 这种基本阵列DAC控制读取操作以及提供阈值电流。 阈值电流是激光器驱动信号电流水平低于激光器25不发射激光束。 在写入期间，CUT电流被添加到由缩放DAC提供的激光驱动电流。 通过计算激光驱动电流对发射辐射的斜率来确定期望的CUT电流。 然后将斜率外推到零点以下，不超过辐射发生相干发射。

    Calibration of lasers that produce multiple power output levels of emitted radiation
    2.
    发明授权
    Calibration of lasers that produce multiple power output levels of emitted radiation 失效
    产生多个发射辐射功率输出电平的激光器的校准

    公开(公告)号：US5687156A

    公开(公告)日：1997-11-11

    申请号：US748083

    申请日：1996-11-13

    申请人： Jerry Elden Hurst, Jr.

    发明人： Jerry Elden Hurst, Jr.

    IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B11/105 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B11/10595 ,  G11B7/0045

    摘要： A laser calibration apparatus and method first calibrates a maximum laser power level. Then lesser laser power levels are calibrated. A separate calibration pattern is used for calibrating each of the laser power levels. The calibration patterns used for the lesser laser power levels include the calibrated maximum laser power level. Such inclusion established a fixed relationship between the maximum laser power level and all of the lesser laser power levels. The calibration is performed on an optical disk, preferably of the magneto optical type. The calibrated laser power levels are then used to record pulse-width modulated signals.

    摘要翻译： 激光校准装置和方法首先校准最大激光功率水平。 然后校准较小的激光功率电平。 使用单独的校准模式来校准每个激光功率电平。 用于较小激光功率电平的校准模式包括校准的最大激光功率电平。 这种包含建立了最大激光功率电平与所有较小激光功率电平之间的固定关系。 在光盘上执行校准，优选地是光磁型。 校准的激光功率电平然后用于记录脉冲宽度调制信号。