公开(公告)号：US5309461A

公开(公告)日：1994-05-03

申请号：US921894

申请日：1992-07-29

申请人： David E. Call ,  Glen A. Jaquette ,  Julian Lewkowicz

发明人： David E. Call ,  Glen A. Jaquette ,  Julian Lewkowicz

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/125 ,  H01S5/068 ,  H01S5/0683 ,  H01S3/00

CPC分类号： G11B7/126 ,  H01S5/06825 ,  H01S5/06832

摘要： A drive circuit for a laser which has the capability of eliminating transient conditions when switching a high frequency modulator on or off, and including elements for maintaining desired depth of modulation. These capabilities are included in a circuit that automatically compensates for changing conditions due to temperature, laser characteristics and fluctuations in media reflectivity.

摘要翻译： 一种用于激光器的驱动电路，其具有在开启或关闭高频调制器时消除瞬态条件的能力，并且包括用于维持所需调制深度的元件。 这些功能包括在电路中，自动补偿由于温度，激光特性和介质反射率波动引起的变化条件。

公开(公告)号：US5602806A

公开(公告)日：1997-02-11

申请号：US495967

申请日：1995-06-28

申请人： Patrick C. Arnett ,  David E. Call ,  Blair I. Finkelstein ,  Glen A. Jaquette ,  Ernesto E. Marinero

发明人： Patrick C. Arnett ,  David E. Call ,  Blair I. Finkelstein ,  Glen A. Jaquette ,  Ernesto E. Marinero

IPC分类号： G11B7/24 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B20/18 ,  G11B11/00

CPC分类号： G11B7/126 ,  G11B11/10519 ,  G11B11/1053 ,  G11B20/1816 ,  G11B11/10506 ,  G11B11/10595

摘要： A light intensity, direct overwrite, magneto-optical system generates signals such that, during the formation of a recording mark on an optical disk, a laser is driven a) at a pedestal power level, then b) at a quench power level for a first quench period t.sub.1, the quench power level being less than the pedestal power level, then c) at a write power level for a write period t.sub.2 whereby the reference bit becomes oriented in the writing direction, the write power level being greater than the pedestal power level, then d) at the quench power level for a second quench period t.sub.3, and then e) at the pedestal power level until the formation of another recording mark begins. The system is provided with a controller to determine optimal lengths of the quench periods t.sub.1 and t.sub.3, thereby reducing thermal interference between closely spaced recording marks. From sample recording marks, recorded with different quench periods t.sub.1 and t.sub.3, the controller calculates a "quality" value, such as bit error rate, jitter or figure of merit, then determines from the quality value the quench periods t.sub.1 and t.sub.3 which will produce the highest quality recording marks.

摘要翻译： 光强度直接覆盖磁光系统产生信号，使得在光盘上形成记录标记期间，以基座功率电平a）驱动激光器，然后b）以骤冷功率电平为 第一骤冷期t1，骤冷功率水平小于基座功率电平，然后c）在写入周期t2的写入功率电平下，由此参考位在写入方向上变向，写入功率电平大于基座 功率电平，然后d）在骤冷功率电平下进行第二骤冷期t3，然后e）处于基座功率电平，直到另一个记录标记的形成开始。 该系统设置有控制器以确定骤冷时段t1和t3的最佳长度，由此减少紧密间隔的记录标记之间的热干扰。 从不同猝灭期t1和t3记录的样品记录标记中，控制器计算诸如误码率，抖动或品质因数的“质量”值，然后根据质量值确定将产生的淬火周期t1和t3 最高质量的录音标记。

公开(公告)号：US5526329A

公开(公告)日：1996-06-11

申请号：US381617

申请日：1995-01-30

申请人： John E. Bish ,  David E. Call ,  Glen A. Jaquette ,  Judson A. McDowell ,  Arturo A. Mojica ,  Lawrence D. Tipton

发明人： John E. Bish ,  David E. Call ,  Glen A. Jaquette ,  Judson A. McDowell ,  Arturo A. Mojica ,  Lawrence D. Tipton

IPC分类号： G11B7/004 ,  G11B7/00

CPC分类号： G11B7/004

摘要： The present invention provides a method and an apparatus to accurately and consistently distinguish blank sectors from written sectors on optical media despite drive and media variations. A readback envelope threshold is established each time optical media is mounted into an optical drive. In one embodiment, the gain of readback amplifiers are set to a first level, the optical head seeks to and reads a sector or set of sectors on the optical disk known to have information recorded thereon and a first readback envelope generated. The gain of the readback preamplifier is then set to a second level, the optical head seeks to and reads another sector or set of sectors known to have information recorded thereon and a second readback envelope generated. The readback threshold is calculated from the amplitudes of the first and second envelopes. Once the threshold has been calculated for a disk, the drive can scan for a blank sector by comparing the amplitude of the sector's readback envelope with the threshold: if the amplitude is less than the threshold, and no other written format feature is readily indicated the sector can be classified as being blank and it is safe to write to the sector.

摘要翻译： 本发明提供了一种方法和装置，即使驱动器和介质变化，也可准确且一致地区分光学介质上的空白扇区与写入扇区。 每当将光学介质安装到光学驱动器中时，建立回读包络阈值。 在一个实施例中，回读放大器的增益被设置为第一电平，光头寻找并读取光盘上已知具有其上记录的信息的扇区或一组扇区，并产生第一回读包络。 然后将回读前置放大器的增益设置为第二电平，光头寻找并读取已知具有记录信息的另一个扇区或一组扇区，并产生第二个回读包络。 从第一和第二信封的振幅计算回读阈值。 一旦已经为磁盘计算了阈值，驱动器可以通过将扇区的回读包络的幅度与阈值进行比较来扫描空白扇区：如果幅度小于阈值，并且不容易指出其他写入格式特征 部门可以被分类为空白，并且可以安全地写入该部门。

公开(公告)号：US5450383A

公开(公告)日：1995-09-12

申请号：US372466

申请日：1995-01-13

申请人： David E. Call ,  Blair I. Finkelstein ,  Glen A. Jaquette

发明人： David E. Call ,  Blair I. Finkelstein ,  Glen A. Jaquette

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

CPC分类号： G11B7/126

摘要： A write-once optical disk data recorder automatically calibrates a laser during a write data operation and using write pulses focussed to a disk. First, the laser is calibrated using a non-focussed laser beam. Each sector of the disk has a laser checking or test area, such as an automatic laser power correction field (ALPC) of two byte lineal extent. During a first write operation after a power up or disk load, a pulse width modulated (PWM) laser test signal is recorded using a laser power level set using the non-focussed laser beam and an indicated desired recording power level on the disk. The recorded laser test signal is read back. The length of the read back laser test signal is measured. The measured length is then compared with a desired length of the PWM laser test signal that indicates a desired laser power level. That is, as laser recording power levels increase, a resultant recorded signal grows in size. This property is used to measure laser power for calibrating laser operation.

摘要翻译： 一次写入光盘数据记录器在写入数据操作期间并且使用聚焦于磁盘的写入脉冲来自动校准激光器。 首先，使用非聚焦激光束对激光进行校准。 磁盘的每个扇区具有激光检查或测试区域，例如两字节的线性范围的自动激光功率校正场（ALPC）。 在上电或磁盘负载后的第一次写入操作期间，使用使用非聚焦激光束设置的激光功率电平和盘上指示的所需记录功率电平来记录脉宽调制（PWM）激光测试信号。 记录的激光测试信号被读回。 测量回读激光测试信号的长度。 然后将测量的长度与指示期望的激光功率电平的PWM激光测试信号的期望长度进行比较。 也就是说，随着激光记录功率电平的增加，所得到的记录信号的大小增加。 该属性用于测量用于校准激光器操作的激光功率。

公开(公告)号：US5430702A

公开(公告)日：1995-07-04

申请号：US197525

申请日：1994-02-16

申请人： John E. Bish ,  David E. Call ,  Glen A. Jaquette ,  Judson A. McDowell ,  Arturo A. Mojica ,  Lawrence D. Tipton

发明人： John E. Bish ,  David E. Call ,  Glen A. Jaquette ,  Judson A. McDowell ,  Arturo A. Mojica ,  Lawrence D. Tipton

IPC分类号： G11B7/004 ,  G11B7/00

CPC分类号： G11B7/004

摘要： The present invention provides a method and an apparatus to accurately and consistently distinguish blank sectors from written sectors on optical media despite drive and media variations. A readback envelope threshold is established each time optical media is mounted into an optical drive. In one embodiment, the gain of readback amplifiers are set to a first level, the optical head seeks to and reads a sector or set of sectors on the optical disk known to have information recorded thereon and a first readback envelope generated. The gain off the readback preamplifier is then set to a second level, the optical head seeks to and reads another sector or set of sectors known to have information recorded thereon and a second readback envelope generated. The readback threshold is calculated from the amplitudes of the first and second envelopes. Once the threshold has been calculated for a disk, the drive can scan for a blank sector by comparing the amplitude of the sector's readback envelope with the threshold: if the amplitude is less than the threshold and no other written format feature is readily indicated, the sector can be classified as being blank and it is safe to write to the sector.

摘要翻译： 本发明提供了一种方法和装置，即使驱动器和介质变化，也可准确且一致地区分光学介质上的空白扇区与写入扇区。 每当将光学介质安装到光学驱动器中时，建立回读包络阈值。 在一个实施例中，回读放大器的增益被设置为第一电平，光头寻找并读取光盘上已知具有其上记录的信息的扇区或一组扇区，并产生第一回读包络。 然后将回读前置放大器的增益设置为第二级，光头寻求并读取已知具有记录在其上的信息的另一扇区或一组扇区，并产生第二回读包络。 从第一和第二信封的振幅计算回读阈值。 一旦为磁盘计算了阈值，驱动器可以通过将扇区的回读包络的幅度与阈值进行比较来扫描空白扇区：如果幅度小于阈值，并且不容易指出其他写入格式特征， 部门可以被分类为空白，并且可以安全地写入该部门。

公开(公告)号：US5216659A

公开(公告)日：1993-06-01

申请号：US757748

申请日：1991-09-11

申请人： David E. Call ,  Julian Lewkowicz

发明人： David E. Call ,  Julian Lewkowicz

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/125

CPC分类号： G11B7/126

摘要： Apparatus and method for calibrating the drive current circuit of a semiconductor laser diode subject to reflected optical feedback from a target surface such an an optical recording disk. The method makes use of two power output vs. drive current characteristic curves for the laser, one curve for in focus condition and one for out of focus condition, wherein the curves exhibit an asymptotic region at high power levels (P.sub.2). Measurement of drive current (I.sub.2) power level P.sub.2 is taken under an out of focus condition. Measurements of drive current at a predetermined low power level P.sub.1 are taken for both (I.sub.1) and in focus condition (I.sub.3). The linear slope of the in focus curve can thus be calculated to set desired power levels.

公开(公告)号：US5185734A

公开(公告)日：1993-02-09

申请号：US555952

申请日：1990-07-20

申请人： David E. Call ,  Julian Lewkowicz

发明人： David E. Call ,  Julian Lewkowicz

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/125 ,  H01S5/06 ,  H01S5/062 ,  H01S5/0683

CPC分类号： G11B7/126 ,  G11B7/004 ,  H01S5/06209 ,  H01S5/0617 ,  H01S5/0683

摘要： An optical disk recorder has a laser driven by a digital analog converter (DAC). During initialization a pair of comparators actuated at minimum and at maximum power levels for actuating a microprocessor to calibrate a DAC 23 between the minimum and maximum power levels rended of digital input changed to the DAC. The same comparators can be used during normal recording and reading operations for detecting under and over power conditions of the laser. Procedures for the calibration and over power and under power detection are described.

摘要翻译： 光盘记录器具有由数字模拟转换器（DAC）驱动的激光器。 在初始化期间，一对比较器以最小功率和最大功率水平启动，用于致动微处理器，以校准DAC23，将数模转换为DAC的最小功率和最大功率电平重新分配。 在正常记录和读取操作期间可以使用相同的比较器来检测激光器的功率和功率条件。 描述了校准和过功率以及功率检测过程。

公开(公告)号：US5268893A

公开(公告)日：1993-12-07

申请号：US779440

申请日：1991-10-18

申请人： David E. Call ,  Lawrence D. Tipton

发明人： David E. Call ,  Lawrence D. Tipton

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B7/126

摘要： Calibration of the write signal power level applied to a transducer for marking a moving media to optimize a later recovered read-back signal is provided. An optimized read-back signal is one where the peak-to-peak amplitude of the read-back signal is maximized. The method provides marking test patterns on the recording media at a plurality of discrete, selected write signal power levels of the marking source, developing a read-back signal from the test pattern marks, correlating portions of the read-back signal with the write signal power levels and solving a relationship of the formW.sub.c =W.sub.o -KB.sub.2 /2B.sub.3where W.sub.c is the calibrated write signal power level W.sub.o is an offset write signal power level. K is a minimum differential between write signal power levels B.sub.2 and B.sub.3 are parameters derived from a least squares fit of a second order polynomial equation to data provided by correlating read-back signals with write signal power levels.

摘要翻译： 提供了应用于用于标记移动介质以优化稍后恢复的读回信号的传感器的写入信号功率电平的校准。 优化的回读信号是回读信号的峰 - 峰幅度最大化的信号。 该方法在标记源的多个离散的，选择的写入信号功率电平下在记录介质上提供标记测试图案，从测试图案标记开发回读信号，将回读信号的部分与写入信号相关联 功率级别并解决Wc = Wo-KB2 / 2B3形式的关系，其中Wc是校准写入信号功率电平Wo是偏移写入信号功率电平。 K是写入信号功率电平B2和B3之间的最小差值是从二阶多项式方程的最小二乘拟合导出的数据与通过将读回信号与写入信号功率电平相关联而提供的数据的参数。

公开(公告)号：US5383175A

公开(公告)日：1995-01-17

申请号：US992525

申请日：1992-12-17

申请人： Blair I. Finkelstein ,  David E. Call

发明人： Blair I. Finkelstein ,  David E. Call

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/09 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B7/126 ,  G11B7/0045

摘要： A laser control system for use with an erasable optical disk device to minimize laser feedback during a recording operation. Focus control circuits are utilized to establish a slightly defocused condition prior to a recording operation and maintaining that slightly defocused condition throughout the recording operation. Defocusing the write beam significantly reduces feedback and thereby significantly increases pulse-to-pulse repeatability of the write pulse amplitude at the optical disk.

摘要翻译： 一种与可擦除光盘装置一起使用以在记录操作期间使激光反馈最小化的激光控制系统。 利用焦点控制电路在记录操作之前建立稍微散焦的状态，并且在整个记录操作期间保持稍微散焦的状态。 对写入光束进行偏聚使显着降低反馈，从而显着增加光盘上的写入脉冲幅度的脉冲对脉冲重复性。

公开(公告)号：US5172365A

公开(公告)日：1992-12-15

申请号：US757743

申请日：1991-09-11

申请人： David E. Call ,  Blair I. Finkelstein ,  Catherine S. Singer

发明人： David E. Call ,  Blair I. Finkelstein ,  Catherine S. Singer

IPC分类号： G01R31/26 ,  G11B7/125 ,  H01S5/00 ,  H01S5/042 ,  H01S5/068

CPC分类号： H05B33/089 ,  G11B7/125 ,  H01S5/06825 ,  H01S5/042

摘要： Method and apparatus for predicting the approach of semiconductor laser diode end-of-life from the power vs. current characteristic curve of the diode thereby obviating the need for nonvolatile memory. Current measurements are taken for three power levels and the linear slope of the characteristic curve at the high power level is compared to the linear slope at low power levels. When the comparison exceeds predetermined criteria, a flag is raised.

摘要翻译： 用于从二极管的功率对电流特性曲线预测半导体激光二极管寿命终止的方法和装置，从而避免了对非易失性存储器的需要。 对三个功率电平进行电流测量，并将高功率电平下的特性曲线的线性斜率与低功率电平下的线性斜率进行比较。 当比较超过预定标准时，会产生一个标志。