公开(公告)号：US06339579B1

公开(公告)日：2002-01-15

申请号：US09287338

申请日：1999-04-07

申请人： Yuichi Kamioka ,  Kenji Koishi ,  Yoshiyuki Miyabata ,  Naoyuki Nakamura ,  Kenichi Tatehara ,  Ikuo Hidaka ,  Kiyoshi Nakamori

发明人： Yuichi Kamioka ,  Kenji Koishi ,  Yoshiyuki Miyabata ,  Naoyuki Nakamura ,  Kenichi Tatehara ,  Ikuo Hidaka ,  Kiyoshi Nakamori

IPC分类号： G11B700

CPC分类号： G11B7/126 ,  H01S5/042 ,  H01S5/0683 ,  H01S5/0687

摘要： In an optical disc apparatus, a semiconductor SLD driving device is mounted on an optical pickup in order to realize a high speed switching of drive current for a semiconductor laser diode (SLD), necessary for recording data. The SLD is placed. within 5 cm from the SLD driving device. The driving device becomes a heat source due to driving current of the SLD, and increases a temperature of the optical pickup. Since the temperature rises proportionally to power consumption, power saving is required. A voltage supplied to the driving device is controlled to be a minimum level necessary for keeping the driving device still working on basic functions. The SLD driving device is mounted to the optical pickup, and this driving device handles N pieces of input signals for setting semiconductor laser power and N pieces of switch-timing-input-signals for selecting respective input signals. A supplied voltage is controlled so that a voltage supplied to the output section of the driving device is a minimum value necessary for keeping the output section still operating. A power source is placed outside of the pickup.

摘要翻译： 在光盘装置中，半导体SLD驱动装置安装在光学拾取器上，以实现用于记录数据所需的用于半导体激光二极管（SLD）的驱动电流的高速切换。 放置SLD。 距离SLD驱动装置5厘米以内。 驱动装置由于SLD的驱动电流而成为热源，并且提高了光学拾取器的温度。 由于温度与功耗成比例上升，因此需要省电。 被提供给驱动装置的电压被控制为使驱动装置保持基本功能所必需的最低水平。 SLD驱动装置安装在光拾取器上，该驱动装置处理N条输入信号以设置半导体激光功率，并且N条开关定时输入信号用于选择各个输入信号。 控制供电电压，使得提供给驱动装置的输出部分的电压是保持输出部分仍然工作所需的最小值。 电源放置在拾音器外面。

公开(公告)号：US06717968B2

公开(公告)日：2004-04-06

申请号：US10303831

申请日：2002-11-26

申请人： Kenichi Tatehara ,  Kiyoshi Nakamori ,  Toshiya Akagi

发明人： Kenichi Tatehara ,  Kiyoshi Nakamori ,  Toshiya Akagi

IPC分类号： H01S310

CPC分类号： H01S5/042 ,  H01S5/0428 ,  H01S5/06835

摘要： The laser drive device of this invention includes a laser, first and second current sources, a current amplifier, and first and second transistors. When the first transistor is OFF, a first current from the first current source is supplied to the current amplifier, where the current is amplified to generate a laser current to be supplied to the laser. Thus, the laser is turned ON. During this time, the second transistor is ON, allowing a second current to flow from a power supply node into the second current source. When the first transistor is ON, the entire or part of the first current flows into the second current source through the first transistor. This reduces the current supplied to the current amplifier and thus the laser current, resulting in turning OFF the laser. During this time, the second transistor is OFF. The values of the first and second currents are determined by a set current value. The value of the laser current supplied to the laser during the ON-state of it is determined by the first current. Therefore, by adjusting the set current value, a desired value of laser current can be supplied to the laser. Having the current amplifier, the values of the first and second currents are smaller than the value of the laser current. This suppresses an increase in power consumed by the first and second power sources and the first and second transistors when the laser current increases.

摘要翻译： 本发明的激光驱动装置包括激光器，第一和第二电流源，电流放大器以及第一和第二晶体管。 当第一晶体管截止时，来自第一电流源的第一电流被提供给电流放大器，其中电流被放大以产生要提供给激光器的激光电流。 因此，激光器被接通。 在此期间，第二晶体管导通，允许第二电流从电源节点流入第二电流源。 当第一晶体管导通时，第一电流的全部或部分通过第一晶体管流入第二电流源。 这降低了提供给电流放大器的电流，从而降低了激光电流，从而导致关闭激光器。 在此期间，第二晶体管截止。 第一和第二电流的值由设定的电流值确定。 在其导通状态期间提供给激光器的激光电流的值由第一电流确定。 因此，通过调整设定电流值，可以向激光器提供期望的激光电流值。 具有电流放大器时，第一和第二电流的值小于激光电流的值。 这抑制了当激光电流增加时由第一和第二电源和第一和第二晶体管消耗的功率的增加。

公开(公告)号：US06490301B1

公开(公告)日：2002-12-03

申请号：US09717141

申请日：2000-11-22

申请人： Kenichi Tatehara ,  Kiyoshi Nakamori ,  Toshiya Akagi

发明人： Kenichi Tatehara ,  Kiyoshi Nakamori ,  Toshiya Akagi

IPC分类号： H01S310

CPC分类号： H01S5/042 ,  H01S5/0428 ,  H01S5/06835

摘要： The laser drive device of this invention includes a laser, first and second current sources, a current amplifier, and first and second transistors. When the first transistor is OFF, a first current from the first current source is supplied to the current amplifier, where the current is amplified to generate a laser current to be supplied to the laser. Thus, the laser is turned ON. During this time, the second transistor is ON, allowing a second current to flow from a power supply node into the second current source. When the first transistor is ON, the entire or part of the first current flows into the second current source through the first transistor. This reduces the current supplied to the current amplifier and thus the laser current, resulting in turning OFF the laser. During this time, the second transistor is OFF. The values of the first and second currents are determined by a set current value. The value of the laser current supplied to the laser during the ON-state of it is determined by the first current. Therefore, by adjusting the set current value, a desired value of laser current can be supplied to the laser. Having the current amplifier, the values of the first and second currents are smaller than the value of the laser current. This suppresses an increase in power consumed by the first and second power sources and the first and second transistors when the laser current increases.

摘要翻译： 本发明的激光驱动装置包括激光器，第一和第二电流源，电流放大器以及第一和第二晶体管。 当第一晶体管截止时，来自第一电流源的第一电流被提供给电流放大器，其中电流被放大以产生要提供给激光器的激光电流。 因此，激光器被接通。 在此期间，第二晶体管导通，允许第二电流从电源节点流入第二电流源。 当第一晶体管导通时，整个或部分第一电流通过第一晶体管流入第二电流源。 这降低了提供给电流放大器的电流，从而降低了激光电流，从而导致关闭激光器。 在此期间，第二晶体管截止。 第一和第二电流的值由设定的电流值确定。 在其导通状态期间提供给激光器的激光电流的值由第一电流确定。 因此，通过调整设定电流值，可以向激光器提供期望的激光电流值。 具有电流放大器时，第一和第二电流的值小于激光电流的值。 这抑制了当激光电流增加时由第一和第二电源和第一和第二晶体管消耗的功率的增加。

公开(公告)号：US07652963B2

公开(公告)日：2010-01-26

申请号：US10553216

申请日：2005-02-15

申请人： Kiyoshi Nakamori

发明人： Kiyoshi Nakamori

IPC分类号： G11B7/00

CPC分类号： G11B7/08505

摘要： In a circuit for detecting a recorded area of an optical disk, when unnecessary noise is superimposed on the space portion of the digitized signal (RF) of an RF signal from the optical disk, a counter (20) for detecting a space portion detects the noise and resets a counter (81) for detecting a recorded area with an output signal S21 therefrom. This prevents the counter (81) for detecting a recorded area from erroneously outputting a recorded area detection signal (S12) due to the noise. As a result, a counter (80) for detecting an unrecorded area outputs an unrecorded area detection signal (S20) with high accuracy to bring a recorded area signal (RECD) from a flip-flop circuit (82) to the L level. Accordingly, an unrecorded area can be detected as it is inherently with high accuracy without being erroneously recognized as a portion in which a mark portion has been recorded.

摘要翻译： 在用于检测光盘的记录区域的电路中，当来自光盘的RF信号的数字化信号（RF）的空间部分上叠加了不必要的噪声时，用于检测空间部分的计数器（20）检测 并且用于从其输出信号S21复位用于检测记录区域的计数器（81）。 这防止用于检测记录区域的计数器（81）由于噪声而错误地输出记录区域检测信号（S12）。 结果，用于检测未记录区域的计数器（80）以高精度输出未记录区域检测信号（S20），以使来自触发器电路（82）的记录区域信号（RECD）为L电平。 因此，可以高精度地固有地检测未记录区域，而不会被错误地识别为已经记录了标记部分的部分。

公开(公告)号：US20060285464A1

公开(公告)日：2006-12-21

申请号：US10553216

申请日：2005-02-15

申请人： Kiyoshi Nakamori

发明人： Kiyoshi Nakamori

IPC分类号： G11B15/04

CPC分类号： G11B7/08505

摘要： In a circuit for detecting a recorded area of an optical disk, when unnecessary noise is superimposed on the space portion of the digitized signal (RF) of an RF signal from the optical disk, a counter (20) for detecting a space portion detects the noise and resets a counter (81) for detecting a recorded area with an output signal S21 therefrom. This prevents the counter (81) for detecting a recorded area from erroneously outputting a recorded area detection signal (S12) due to the noise. As a result, a counter (80) for detecting an unrecorded area outputs an unrecorded area detection signal (S20) with high accuracy to bring a recorded area signal (RECD) from a flip-flop circuit (82) to the L level. Accordingly, an unrecorded area can be detected as it is inherently with high accuracy without being erroneously recognized as a portion in which a mark portion has been recorded.

摘要翻译： 在用于检测光盘的记录区域的电路中，当来自光盘的RF信号的数字化信号（RF）的空间部分上叠加了不必要的噪声时，用于检测空间部分的计数器（20）检测 噪声，并且复位用于检测具有来自其的输出信号S 21的记录区域的计数器（81）。 这防止了由于噪声而使计数器（81）检测记录区域错误地输出记录区域检测信号（S12）。 结果，用于检测未记录区域的计数器（80）以高精度输出未记录区域检测信号（S 20），以使来自触发器电路（82）的记录区域信号（RECD）为L电平。 因此，可以高精度地固有地检测未记录区域，而不会被错误地识别为已经记录了标记部分的部分。