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1.发明授权Laser control unit, laser control circuit, and laser-power adjustment method 失效激光控制单元，激光控制电路和激光功率调节方法公开(公告)号：US07366080B2
公开(公告)日：2008-04-29
申请号：US10986959
申请日：2004-11-15
IPC分类号： G11B7/00
CPC分类号： G11B7/126 , G11B7/1267 , H01S5/042
摘要： A laser control unit, a laser control circuit and a laser-power adjustment method are provided which are capable of controlling laser power precisely, even if an error is produced in the duty of an optical pulse. A light-receiving element 101 converts the optical pulse into an electric signal and outputs a photo-detection signal; an LPF 114 calculates the average value of the optical pulse, based on the photo-detection signal; a DSP 124 calculates a light-emission power value, based on the average value of the optical pulse and the duty of the optical pulse, and calculates the difference between the light-emission power value and a target power value; an EP-ROM 160 stores a correction value for correcting a calculation which is executed by the DSP 124; the DSP 124 corrects the calculation, based on the correction value, and controls an electric-current value which is supplied to a semiconductor laser 150, based on the calculation result which is obtained from the correction; and a laser drive circuit 40 drives the semiconductor laser 150, based on the electric-current value.
摘要翻译： 提供激光控制单元，激光控制电路和激光功率调节方法，即使在光脉冲的占空比中产生误差，也能够精确地控制激光功率。 光接收元件101将光脉冲转换为电信号并输出光检测信号; LPF114基于光检测信号计算光脉冲的平均值; DSP 124基于光脉冲的平均值和光脉冲的占空比来计算发光功率值，并计算发光功率值和目标功率值之间的差; EP-ROM 160存储用于校正由DSP 124执行的计算的校正值; DSP 124基于校正值来校正计算，并且基于从校正获得的计算结果来控制提供给半导体激光器150的电流值; 并且激光驱动电路40基于电流值驱动半导体激光器150。
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2.发明申请Laser control unit, laser control circuit, and laser-power adjustment method 失效激光控制单元，激光控制电路和激光功率调节方法公开(公告)号：US20050105569A1
公开(公告)日：2005-05-19
申请号：US10986959
申请日：2004-11-15
CPC分类号： G11B7/126 , G11B7/1267 , H01S5/042
摘要： A laser control unit, a laser control circuit and a laser-power adjustment method are provided which are capable of controlling laser power precisely, even if an error is produced in the duty of an optical pulse. A light-receiving element 101 converts the optical pulse into an electric signal and outputs a photo-detection signal; an LPF 114 calculates the average value of the optical pulse, based on the photo-detection signal; a DSP 124 calculates a light-emission power value, based on the average value of the optical pulse and the duty of the optical pulse, and calculates the difference between the light-emission power value and a target power value; an EP-ROM 160 stores a correction value for correcting a calculation which is executed by the DSP 124; the DSP 124 corrects the calculation, based on the correction value, and controls an electric-current value which is supplied to a semiconductor laser 150, based on the calculation result which is obtained from the correction; and a laser drive circuit 40 drives the semiconductor laser 150, based on the electric-current value.
摘要翻译： 提供激光控制单元，激光控制电路和激光功率调节方法，即使在光脉冲的占空比中产生误差，也能够精确地控制激光功率。 光接收元件101将光脉冲转换为电信号并输出光检测信号; LPF114基于光检测信号计算光脉冲的平均值; DSP 124基于光脉冲的平均值和光脉冲的占空比来计算发光功率值，并计算发光功率值和目标功率值之间的差; EP-ROM 160存储用于校正由DSP 124执行的计算的校正值; DSP 124基于校正值来校正计算，并且基于从校正获得的计算结果来控制提供给半导体激光器150的电流值; 并且激光驱动电路40基于电流值驱动半导体激光器150。
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公开(公告)号：US07177253B2
公开(公告)日：2007-02-13
申请号：US10524896
申请日：2003-10-06
IPC分类号： G11B7/00
CPC分类号： G11B7/126
摘要： In an optical disc drive, a laser light source emits a laser beam having an intensity changeable with the amount of drive current supplied. A first photodetector receives the laser beam reflected from an optical disc, thereby generating a readout signal. A second photodetector receives the laser beam, generates an electric signal representing the power of the laser beam received, and outputs the electric signal as a light quantity detection signal. A feedback control loop compares the level of the light quantity detection signal with a predetermined target value and regulates the drive current such that the level of the light quantity detection signal approaches the target value. In reading data from the optical disc, the target value is changed so as to compensate for a variation of the sensitivity of the second photodetector, thereby controlling the power of the laser beam emitted from the laser light source.
摘要翻译： 在光盘驱动器中，激光光源发射具有随供给的驱动电流量而变化的强度的激光束。 第一光电检测器接收从光盘反射的激光束，从而产生读出信号。 第二光电检测器接收激光束，产生表示所接收的激光束的功率的电信号，并将该电信号作为光量检测信号输出。 反馈控制环路将光量检测信号的电平与预定目标值进行比较，并且调节驱动电流，使得光量检测信号的电平接近目标值。 在从光盘读取数据时，改变目标值以补偿第二光电检测器的灵敏度的变化，从而控制从激光光源发射的激光束的功率。
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4.发明授权Method and apparatus for controlling laser power using a test light emission pattern having a multipulse light emission interval 有权使用具有多脉冲发光间隔的测试发光图案来控制激光功率的方法和装置公开(公告)号：US07310293B2
公开(公告)日：2007-12-18
申请号：US10815782
申请日：2004-04-02
IPC分类号： G11B7/125
CPC分类号： G11B7/1267 , G11B7/0062
摘要： Method for controlling a laser power used in recording on an optical disk includes: causing the laser to emit a test light emission pattern including a multipulse light emission interval and an at-bottom value continuous light emission interval; receiving the test light emission pattern of the laser to convert the pattern to an electric signal and to thereby obtain a light detection signal; calculating a detection value of a multipulse average value from the average value of the light detection signal, and calculating a bottom detection value from the light detection signal to obtain a light emission power characteristic of the laser on a supplied current based on the detection value of the multipulse average value and the bottom detection value; and controlling the current supplied to the laser based on the light emission power characteristic on the current supplied to the laser.
摘要翻译： 用于控制在光盘上记录的激光功率的方法包括：使激光器发射包括多脉冲发光间隔和底部值连续发光间隔的测试发光图案; 接收激光的测试发光图案以将图案转换成电信号，从而获得光检测信号; 根据光检测信号的平均值计算多脉冲平均值的检测值，根据光检测信号计算底部检测值，根据供给电流的检测值，求出激光的发光功率特性 多脉冲平均值和底部检测值; 以及基于提供给激光器的电流的发光功率特性来控制提供给激光器的电流。
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公开(公告)号：US20050254403A1
公开(公告)日：2005-11-17
申请号：US10524896
申请日：2003-10-06
CPC分类号： G11B7/126
摘要： In an optical disc drive, a laser light source emits a laser beam having an intensity changeable with the amount of drive current supplied. A first photodetector receives the laser beam reflected from an optical disc, thereby generating a readout signal. A second photodetector receives the laser beam, generates an electric signal representing the power of the laser beam received, and outputs the electric signal as a light quantity detection signal. A feedback control loop compares the level of the light quantity detection signal with a predetermined target value and regulates the drive current such that the level of the light quantity detection signal approaches the target value. In reading data from the optical disc, the target value is changed so as to compensate for a variation of the sensitivity of the second photodetector, thereby controlling the power of the laser beam emitted from the laser light source.
摘要翻译： 在光盘驱动器中，激光光源发射具有随供给的驱动电流量而变化的强度的激光束。 第一光电检测器接收从光盘反射的激光束，从而产生读出信号。 第二光电检测器接收激光束，产生表示所接收的激光束的功率的电信号，并将该电信号作为光量检测信号输出。 反馈控制环路将光量检测信号的电平与预定目标值进行比较，并且调节驱动电流，使得光量检测信号的电平接近目标值。 在从光盘读取数据时，改变目标值以补偿第二光电检测器的灵敏度的变化，从而控制从激光光源发射的激光束的功率。
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公开(公告)号：US07010006B2
公开(公告)日：2006-03-07
申请号：US10465948
申请日：2002-06-21
申请人： Ken'ichi Kasazumi , Yasuo Kitaoka , Tosifumi Yokoyama , Kiminori Mizuuchi , Kazuhisa Yamamoto , Hisashi Senga , Shigeru Furumiya , Hiromichi Ishibashi
发明人： Ken'ichi Kasazumi , Yasuo Kitaoka , Tosifumi Yokoyama , Kiminori Mizuuchi , Kazuhisa Yamamoto , Hisashi Senga , Shigeru Furumiya , Hiromichi Ishibashi
CPC分类号： H01S5/0687 , G02F1/37 , H01S5/005 , H01S5/0092 , H01S5/06256 , H01S5/0683
摘要： A light source device can attain a stable output of a harmonic even when there occurs a change in the ambient temperature or fluctuation in the output power. The light source device is provided with a semiconductor laser source (4), an optical waveguide-type QPM-SHG device (5) for generating a second harmonic from light emitted from the semiconductor laser source (4), a wavelength control means (7) for controlling a wavelength of light emitted from the semiconductor laser source (4), a means for slightly fluctuating wavelength (8) for changing a wavelength of light emitted from the semiconductor laser source (4) and a means for detecting a change in output light power of the optical waveguide-type QPM-SHG device (5) that occurs when a wavelength of light emitted from the semiconductor laser source (4) is changed. In this case, a wavelength of light emitted from the semiconductor laser source (4) is controlled to an optimum wavelength of the optical waveguide-type QPM-SHG device (5) based on a change in output light power of the optical waveguide-type QPM-SHG device (5) that occurs when a wavelength of light emitted from the semiconductor laser source (4) is changed.
摘要翻译： 即使发生环境温度的变化或输出功率的波动，光源装置也可以获得稳定的谐波输出。 光源装置设置有半导体激光源（4），用于从半导体激光源（4）发射的光产生二次谐波的光波导型QPM-SHG器件（5），波长控制装置（7） ），用于控制从半导体激光源（4）发射的光的波长，用于稍微波动的用于改变从半导体激光源（4）发射的光的波长的波长（8）的装置和用于检测输出变化的装置 当从半导体激光源（4）发射的光的波长改变时发生的光波导型QPM-SHG器件（5）的光功率变化。 在这种情况下，基于光波导型的输出光功率的变化，从半导体激光源（4）发射的光的波长被控制到光波导型QPM-SHG器件（5）的最佳波长 当从半导体激光源（4）发射的光的波长改变时发生的QPM-SHG器件（5）。
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公开(公告)号：US20090074018A1
公开(公告)日：2009-03-19
申请号：US12235824
申请日：2008-09-23
CPC分类号： G11B7/126 , G11B7/00456 , G11B7/0062 , H01S5/0428
摘要： A laser driving device is provided that can support a higher speed and drives a semiconductor laser (3) to emit light in a pulse-like manner in accordance with a digital signal. The laser driving device includes a temperature sensor (5), a recording pulse generator (1), an auxiliary pulse generator (4), and an adder (8). The temperature sensor (5) produces a measured temperature that changes in accordance with a temperature of the semiconductor laser. The recording pulse generator (1), the auxiliary pulse generator (4), and the adder (8) produce a pulse-like signal having a shape corresponding to the measured temperature.
摘要翻译： 提供了可以支持更高速度并且驱动半导体激光器（3）以根据数字信号的脉冲状发射光的激光驱动装置。 激光驱动装置包括温度传感器（5），记录脉冲发生器（1），辅助脉冲发生器（4）和加法器（8）。 温度传感器（5）产生根据半导体激光器的温度而变化的测量温度。 记录脉冲发生器（1），辅助脉冲发生器（4）和加法器（8）产生具有对应于测量温度的形状的脉冲状信号。
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公开(公告)号：US07085297B2
公开(公告)日：2006-08-01
申请号：US10826313
申请日：2004-04-19
CPC分类号： H01S5/06256 , H01S5/005 , H01S5/0092 , H01S5/06226 , H01S5/06253
摘要： A driving method of a semiconductor laser having an active layer region, a phase adjustment region and a distributed Bragg reflector region includes the steps of: calculating an average value of multipulse modulation currents modulated between a peak current and a bottom current input to said active layer region; calculating a difference between the average value of the multipulse modulation currents and a bias current input to the active layer region; and applying a first compensation current to the phase adjustment region when the multipulse modulation current is input to the active layer region, and applying a second compensation current corresponding to the difference to the phase adjustment region when the bias current is input to the active layer region.
摘要翻译： 具有有源层区域，相位调整区域和分布布拉格反射器区域的半导体激光器的驱动方法包括以下步骤：计算在输入到所述有源层的峰值电流和底部电流之间调制的多脉冲调制电流的平均值 地区; 计算多脉冲调制电流的平均值与输入到有源层区域的偏置电流之间的差; 以及当所述多脉冲调制电流被输入到所述有源层区域时，向所述相位调整区域施加第一补偿电流，以及当所述偏置电流被输入到所述有源层区域时，将与所述差异对应的第二补偿电流施加到所述相位调整区域 。
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公开(公告)号：US20050069002A1
公开(公告)日：2005-03-31
申请号：US10938536
申请日：2004-09-13
CPC分类号： G11B7/126 , G11B7/00456 , G11B7/0062 , H01S5/0428
摘要： A laser driving device is provided that can support a higher speed and drives a semiconductor laser (3) to emit light in a pulse-like manner in accordance with a digital signal. The laser driving device includes a temperature sensor (5), a recording pulse generator (1), an auxiliary pulse generator (4), and an adder (8). The temperature sensor (5) produces a measured temperature that changes in accordance with a temperature of the semiconductor laser. The recording pulse generator (1), the auxiliary pulse generator (4), and the adder (8) produce a pulse-like signal having a shape corresponding to the measured temperature.
摘要翻译： 提供了可以支持更高速度并且驱动半导体激光器（3）以根据数字信号的脉冲状发射光的激光驱动装置。 激光驱动装置包括温度传感器（5），记录脉冲发生器（1），辅助脉冲发生器（4）和加法器（8）。 温度传感器（5）产生根据半导体激光器的温度而变化的测量温度。 记录脉冲发生器（1），辅助脉冲发生器（4）和加法器（8）产生具有对应于测量温度的形状的脉冲状信号。
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公开(公告)号：US20060018236A1
公开(公告)日：2006-01-26
申请号：US11188059
申请日：2005-07-22
IPC分类号： G11B7/00
CPC分类号： G11B7/1381 , G11B7/1263 , G11B7/127 , G11B20/10 , G11B2007/0013
摘要： When a light-receiving element receives a first laser beam, an output power detection unit detects a differential quantum efficiency value of the first laser beam. A control unit judges whether or not an intensity filter and a filter driving unit are operated in accordance with a control signal output from the control unit by using the differential quantum efficiency value from the output power detection unit.
摘要翻译： 当光接收元件接收到第一激光束时，输出功率检测单元检测第一激光束的差分量子效率值。 控制单元通过使用来自输出功率检测单元的差分量子效率值来判断强度滤波器和滤波器驱动单元是否根据从控制单元输出的控制信号来操作。
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