公开(公告)号：US06811087B2

公开(公告)日：2004-11-02

申请号：US10410395

申请日：2003-04-10

申请人： Norio Nakamura ,  Nobuyasu Goto ,  Takaaki Shimizu ,  Yutaka Ichinohe

发明人： Norio Nakamura ,  Nobuyasu Goto ,  Takaaki Shimizu ,  Yutaka Ichinohe

IPC分类号： G06K710

CPC分类号： G06K7/10851

摘要： A barcode scanner comprising a laser driving circuit to drive a laser by a pulse signal generated by an oscillator, a preamplifier to amplify a voltage of a barcode signal from a photodetector corresponding to a reflected light from a barcode scanned by a light output of the laser driven by the pulse signal, a high-pass filter to remove a direct current component contained in an output signal of the preamplifier, a variable gain amplifier which controls an amplification gain of an output signal of the high-pass filter and performs automatic gain control to set an output level almost constant, a synchronous detector to detect a pulse signal contained in an output signal of the variable gain amplifier in synchronization with the output pulse of the oscillator, and a binarization circuit to binarize an output signal of the synchronous detector.

摘要翻译： 一种条形码扫描器，包括：激光驱动电路，用于通过由振荡器产生的脉冲信号来驱动激光;前置放大器，用于放大来自光电检测器的条形码信号的电压，所述光电检测器对应于来自由激光的光输出扫描的条形码的反射光 由脉冲信号驱动的高通滤波器，去除包含在前置放大器的输出信号中的直流分量;可变增益放大器，其控制高通滤波器的输出信号的放大增益，并执行自动增益控制 为了使输出电平几乎恒定，同步检波器与振荡器的输出脉冲同步地检测包含在可变增益放大器的输出信号中的脉冲信号，以及二值化电路，对同步检波器的输出信号进行二值化。

公开(公告)号：US6084470A

公开(公告)日：2000-07-04

申请号：US200737

申请日：1998-11-30

申请人： Toshio Shiramatsu ,  Norio Nakamura ,  Nobuyasu Goto

发明人： Toshio Shiramatsu ,  Norio Nakamura ,  Nobuyasu Goto

IPC分类号： H03H11/04 ,  H03H11/12 ,  H03F3/45 ,  H03F3/04

CPC分类号： H03H11/1213 ,  H03H11/0422 ,  H03H11/1291

摘要： In this filter circuit, the emitter of a transistor Q1 is connected to the collector of a transistor Q2, and the base of the transistor Q2 is connected to the emitter of a transistor Q3 and the collector of a transistor Q4. The base of the transistor Q4 is connected to the collector of the transistor Q2. A capacitor C1 is connected between the emitters of the transistors Q2 and Q4, and a capacitor C2 is connected between the collectors of the transistors Q2 and Q4. With this arrangement, the filter circuit consumes a small power, is hardly influenced by the parasitic capacitance, can operate at high frequencies, and has a wide dynamic range.

摘要翻译： 在该滤波电路中，晶体管Q1的发射极与晶体管Q2的集电极连接，晶体管Q2的基极与晶体管Q3的发射极和晶体管Q4的集电极连接。 晶体管Q4的基极连接到晶体管Q2的集电极。 电容器C1连接在晶体管Q2和Q4的发射极之间，电容器C2连接在晶体管Q2和Q4的集电极之间。 通过这种布置，滤波电路消耗小功率，几乎不受寄生电容的影响，可以在高频下工作，并具有较宽的动态范围。

公开(公告)号：US5712739A

公开(公告)日：1998-01-27

申请号：US337437

申请日：1994-11-08

申请人： Norio Nakamura ,  Yusuke Ohinata ,  Junichi Akiyama ,  Nobuyasu Goto

发明人： Norio Nakamura ,  Yusuke Ohinata ,  Junichi Akiyama ,  Nobuyasu Goto

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B5/39 ,  G11B19/02 ,  G11B5/127

CPC分类号： G11B5/3967 ,  G11B19/02 ,  G11B5/012 ,  G11B5/09 ,  G11B2005/0018

摘要： A magnetic disk drive system for writing data into a disk-shaped magnetic medium and reading data stored therein, comprises a first terminal, a second terminal, and at least one third terminal, a composite head unit including an inductive write head and at least one magnetoresistive read head which are connected in series between the first and second terminals, and at least one common connection node connected to the at least one third terminal, and a driving circuit connected to the first through third terminals. The driving circuit includes a write circuit for supplying a write current to the write head, a read circuit for supplying a sense current to the read head to generate a read signal, and a plurality of switches for connecting the write circuit to the write head and electrically disconnecting the read circuit from the composite head unit and the write circuit during writing, and for connecting the read circuit to the read head and electrically disconnecting the write circuit from the composite head unit and the read circuit during reading.

摘要翻译： 一种磁盘驱动系统，用于将数据写入盘形磁介质并读取存储在其中的数据，包括第一端子，第二端子和至少一个第三端子，复合磁头单元，其包括感应写头和至少一个 磁阻读取头串联连接在第一和第二端子之间，以及至少一个公共连接节点连接到至少一个第三端子，以及驱动电路，连接到第一至第三端子。 驱动电路包括用于向写入头提供写入电流的写入电路，用于向读取头提供感测电流以产生读取信号的读取电路，以及用于将写入电路连接到写入头的多个开关，以及 在写入期间将读取电路与复合磁头单元和写入电路电连接，并且用于将读取电路连接到读取磁头，并且在读取期间将写入电路与复合磁头单元和读取电路电连接。

公开(公告)号：US06344778B1

公开(公告)日：2002-02-05

申请号：US09596056

申请日：2000-06-16

申请人： Norio Nakamura ,  Katsuyuki Omi ,  Toshio Shiramatsu ,  Nobuyasu Goto ,  Masaru Hashimoto

发明人： Norio Nakamura ,  Katsuyuki Omi ,  Toshio Shiramatsu ,  Nobuyasu Goto ,  Masaru Hashimoto

IPC分类号： H03B524

CPC分类号： H03L7/0805 ,  G11B20/1403 ,  H03B5/24 ,  H03L5/00 ,  H03L7/099

摘要： A delay-time variable filter delays an input signal by a desired time according to a control signal from a control input node and outputs the delayed input signal, and a positive feedback loop circuit changes the output signal (sinusoidal wave signal) from this filter, and provides a positive feedback of the binary pulse signal to the input side of the filter at a desired level for carrying out an oscillation. This positive feedback loop circuit includes a circuit for changing the signal into a binary signal and providing a positive feedback of the binary signal to the input of the filter by limiting the signal at a desired amplitude. As the delay-time variable filter, a quartic Butterworth low-pass filter is used, for example. As the positive feedback loop circuit, there is used a voltage comparator circuit that changes an input signal into a binary signal and outputs a pulse signal of a desired amplitude.

摘要翻译： 延迟时间可变滤波器根据来自控制输入节点的控制信号将输入信号延迟所需时间，并输出延迟输入信号，正反馈环路电路改变来自该滤波器的输出信号（正弦波信号） 并且将二进制脉冲信号的正反馈提供给滤波器的输入侧，以实现振荡的期望水平。 该正反馈环路电路包括用于将信号改变为二进制信号的电路，并通过将信号限制在期望的幅度来提供二进制信号的正反馈给滤波器的输入。 作为延迟时间可变滤波器，例如使用四分之一巴特沃思低通滤波器。 作为正反馈环路电路，使用将输入信号变更为二进制信号并输出​​期望幅度的脉冲信号的电压比较电路。

公开(公告)号：US6060887A

公开(公告)日：2000-05-09

申请号：US892992

申请日：1997-07-15

申请人： Norio Nakamura ,  Nobuyasu Goto

发明人： Norio Nakamura ,  Nobuyasu Goto

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/17 ,  G11B5/455 ,  G11B19/04 ,  G01R31/06

CPC分类号： G11B19/04 ,  G11B5/012 ,  G11B5/455 ,  G11B2005/0016

摘要： A circuit and method for detecting an abnormality in a recording head, wherein a voltage detection circuit detects a counter electromotive voltage generated across the two terminals of a recording head to which a recording current is supplied from a recording circuit; a processing circuit generates the maximum, minimum, and mean voltages from the counter electromotive voltage; a discrimination circuit using these voltages determines whether an abnormality occurs in the recording head. An output circuit outputs the result. With this operation, an abnormality in the recording head having two terminals in an MR head can be detected with a high precision.

摘要翻译： 一种用于检测记录头中的异常的电路和方法，其中电压检测电路检测从记录电路向其提供记录电流的记录头的两个端子两端产生的反电动势电压; 处理电路从反电动势电压产生最大，最小和平均电压; 使用这些电压的识别电路确定在记录头中是否发生异常。 输出电路输出结果。 通过该操作，可以高精度地检测具有MR头中的两个端子的记录头的异常。

公开(公告)号：US08373397B2

公开(公告)日：2013-02-12

申请号：US12879945

申请日：2010-09-10

申请人： Ryo Tanifuji ,  Nobuyasu Goto

发明人： Ryo Tanifuji ,  Nobuyasu Goto

IPC分类号： G05F1/40

CPC分类号： H02M3/158 ,  H02M3/156 ,  H02M2001/0032 ,  Y02B70/16

摘要： A DC-DC converter according to the present invention includes a monitoring circuit which monitors an output signal of a mode comparator and which outputs a mode change detection signal when the output of the mode comparator has output a light load mode signal, and a clamp circuit which is connected between power supply and ground and which changes a voltage at a first end of a filter circuit toward a preset prescribed voltage according to the mode change detection signal.

摘要翻译： 根据本发明的DC-DC转换器包括监视模式比较器的输出信号的监视电路，并且当模式比较器的输出已经输出轻负载模式信号时输出模式改变检测信号，并且钳位电路 其连接在电源和地之间，并且根据模式改变检测信号将滤波器电路的第一端的电压改变为预设的规定电压。