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1. 发明授权

US5623378A Signal reproducing circuit adopted for head utilizing magneto-resistive effect with control for reducing transient period between read and write states 失效
标题翻译：信号再现电路采用磁头利用磁阻效应控制，以减少读写状态之间的瞬态周期
公开(公告)号：US5623378A
公开(公告)日：1997-04-22
申请号：US306210
申请日：1994-09-14
申请人： Hidekazu Shibasaki , Hiroaki Ueno
发明人： Hidekazu Shibasaki , Hiroaki Ueno
IPC分类号： G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/31 , G11B5/39 , G11B5/49 , G11B15/12 , G11B19/02 , G11B19/04
CPC分类号： G11B5/012 , G11B19/02 , G11B19/04 , G11B5/00 , G11B5/02 , G11B15/125 , G11B2005/0016 , G11B2005/0018 , G11B5/4969
摘要： A signal reproducing circuit includes: a magneto-resistive effect head having one end thereof coupled to a first power supply line, for reproducing data recorded on a magnetic recording medium in a read operation; a first constant current source coupled between another end of the head and a second power supply line, for supplying the head with a sense current in the read operation; first and second transistors having collectors thereof coupled to the first power supply line, and responsive to voltage signals obtained from both ends of the head; second and third constant current sources coupled between each emitter of the first and second transistors and the second power supply line, for supplying the first and second transistors with a predetermined constant current in the read operation; a capacitor connected between each emitter of the first and second transistors; and a control circuit responsive to a read/write control signal, for controlling respective ON/OFF timings of the first to third constant current sources. In a transition from a read state to a write state, the second and third constant current sources are first turned OFF and the first constant current source is then turned OFF. In a transition from a write state to a read state, the first constant current source is first turned ON and the second and third constant current sources are then turned ON. It is possible to reduce a transient idle period from a write state to a read state to thereby prevent an undesirable offset component from overlapping the reproduced signal, and to reduce a loss in the data capacity to a minimum.
摘要翻译：信号再现电路包括：磁阻效应头，其一端耦合到第一电源线，用于在读取操作中再现记录在磁记录介质上的数据; 耦合在头部的另一端和第二电源线之间的第一恒定电流源，用于在读取操作中向头提供感测电流; 第一和第二晶体管具有其收集器，耦合到第一电源线，并且响应于从头部的两端获得的电压信号; 耦合在第一和第二晶体管的每个发射极与第二电源线之间的第二和第三恒流源，用于在读取操作中向第一和第二晶体管提供预定的恒定电流; 连接在第一和第二晶体管的每个发射极之间的电容器; 以及响应于读/写控制信号的控制电路，用于控制第一至第三恒流源的相应的ON / OFF定时。在从读取状态到写入状态的转变中，首先关闭第二和第三恒定电流源，然后关闭第一恒定电流源。在从写入状态到读取状态的转变中，首先将第一恒定电流源导通，然后将第二和第三恒定电流源接通。可以将暂时空闲时段从写入状态减小到读取状态，从而防止不期望的偏移分量与再现信号重叠，并将数据容量的损失减少到最小。

2. 发明授权

US6147824A Signal reproducing circuit for magneto-resistive head including control circuit for reducing transient period between write period and read period 失效
标题翻译：用于磁阻头的信号再现电路包括用于减少写周期和读周期之间的瞬态周期的控制电路
公开(公告)号：US6147824A
公开(公告)日：2000-11-14
申请号：US772649
申请日：1996-12-23
申请人： Hidekazu Shibasaki , Hiroaki Ueno
发明人： Hidekazu Shibasaki , Hiroaki Ueno
IPC分类号： G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/31 , G11B5/39 , G11B5/49 , G11B15/12 , G11B19/02 , G11B19/04
CPC分类号： G11B5/012 , G11B19/02 , G11B19/04 , G11B5/00 , G11B5/02 , G11B15/125 , G11B2005/0016 , G11B2005/0018 , G11B5/4969
摘要： A signal reproducing circuit includes first power supply lines having different potentials, a magneto-resistive effect head having one end thereof coupled to the first power supply line, for reproducing data recorded on a magnetic recording medium in a read operation, and a first constant current source coupled between another end of the magneto-resistive effect head and the second power supply line, for supplying the magneto-resistive effect head with a sense current in the read operaion. Also included are first and second transistors having collectors thereof coupled to the first power supply line, respectively, and responsive to voltage signals obtained from the one end and the other end of the magneto-resistive effect head. Second and third constant current sources are coupled between each emitter of the first and the second transistors and the second power supply line, respectively, for supplying the first and the second transistors with a first predetermined constant current, respectively, in the read operation. Fourth and fifth constant current sources are provided between each emitter of the first and the second transistors, respectively, and the second power supply line for increasing the emiter curents of the first and the second transistors to a second predetermined constant current during a predetermined period in a transition from a write state to a read state.
摘要翻译：信号再现电路包括具有不同电位的第一电源线，磁阻效应头，其一端耦合到第一电源线，用于在读取操作中再现记录在磁记录介质上的数据，以及第一恒定电流源极耦合在磁阻效应头的另一端和第二电源线之间，用于在读操作中向磁阻效应头提供感测电流。还包括具有分别耦合到第一电源线的集电极的第一和第二晶体管，并响应从磁阻效应头的一端和另一端获得的电压信号。第二和第三恒流源分别耦合在第一和第二晶体管的每个发射极与第二电源线之间，用于在读取操作中分别向第一和第二晶体管提供第一预定的恒定电流。第四和第五恒流源分别设置在第一和第二晶体管的每个发射极之间，第二电源线用于在第一和第二晶体管的预定时段期间将第一和第二晶体管的电位器固化增加到第二预定恒定电流从写入状态到读取状态的转换。

3. 发明授权

US5978164A Signal reproducing circuit adapted for head utilizing magneto-resistive effect 失效
标题翻译：信号再现电路适用于磁头利用磁阻效应
公开(公告)号：US5978164A
公开(公告)日：1999-11-02
申请号：US12718
申请日：1998-01-23
申请人： Hidekazu Shibasaki , Hiroaki Ueno
发明人： Hidekazu Shibasaki , Hiroaki Ueno
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/49 , G11B15/12 , G11B19/02 , G11B19/04
CPC分类号： G11B19/02 , G11B19/04 , G11B5/00 , G11B5/012 , G11B5/02 , G11B15/125 , G11B2005/0016 , G11B2005/0018 , G11B5/4969
摘要： A signal reproducing circuit includes a magneto-resistive effect head having one end thereof coupled to a first power supply line, for reproducing data recorded on a magnetic recording medium in a read operation. A first constant current source is coupled between another end of the head and a second power supply line, for supplying the head with a sense current in the read operation. First and second transistors have collectors thereof coupled to the first power supply line, and are responsive to voltage signals obtained from both ends of the head, respectively. Second and third constant current sources are coupled between each emitter of the first and second transistors and the second power supply line, respectively, for supplying the first and second transistors with a predetermined constant current in the read operation. A capacitor is connected between each emitter of the first and second transistors. A control circuit responsive to a read/write control signal controls respective ON/OFF timings of the first to third constant current sources. The control means controls at least one signal reproducing circuit portion corresponding to nonselected heads to be brought to a read state when a signal reproducing circuit portion corresponding to a selected head is in a write state.
摘要翻译：信号再现电路包括一个磁阻效应头，其一端耦合到第一电源线，用于在读取操作中再现记录在磁记录介质上的数据。第一恒定电流源耦合在头部的另一端和第二电源线之间，用于在读取操作中向头提供感测电流。第一和第二晶体管具有耦合到第一电源线的集电极，并且分别响应于从头部的两端获得的电压信号。第二和第三恒流源分别耦合在第一和第二晶体管的每个发射极和第二电源线之间，用于在读取操作中以预定的恒定电流提供第一和第二晶体管。电容器连接在第一和第二晶体管的每个发射极之间。响应于读/写控制信号的控制电路控制第一至第三恒流源的相应的ON / OFF定时。当与所选择的头相对应的信号再现电路部分处于写入状态时，控制装置控制与非选择磁头对应的至少一个信号再现电路部分进入读取状态。

4. 发明授权

US6118611A Signal reproducing circuit adapted to head utilizing magneto-resistive effect 失效
标题翻译：信号再现电路适用于磁头利用磁阻效应
公开(公告)号：US6118611A
公开(公告)日：2000-09-12
申请号：US948209
申请日：1997-10-09
申请人： Hidekazu Shibasaki , Hiroaki Ueno , Ken Yakuwa
发明人： Hidekazu Shibasaki , Hiroaki Ueno , Ken Yakuwa
IPC分类号： G11B5/00 , G11B5/02 , G11B19/02 , G11B5/09
CPC分类号： G11B5/02 , G11B19/02 , G11B2005/0016 , G11B2005/0018
摘要： A signal reproducing circuit for a magneto-resistive effect head includes a constant current source for supplying a sense current to an MR head in a read state, first constant current sources for supplying first constant currents to a pair of reproduction transistors in the read state, and a capacitor connected between the emitters of the transistors. Furthermore, second constant current sources for supplying second constant currents are connected in parallel with the first constant current sources. Control is given so that when switching an idle state to the read state is commanded, the second constant current sources remain on for a given period of time. Owing to this circuitry, a transient period during which the idle state is switched to the read state or a transient period during which heads are switched in the read state can be shortened to a great extent. Consequently, superposition of an unwanted offset component on a reproduced signal can be suppressed, and a loss in data-handling capacity can be minimized.
摘要翻译：用于磁阻效应头的信号再现电路包括用于在读取状态下向MR磁头提供感测电流的恒流源，用于在读取状态下向一对再现晶体管提供第一恒定电流的第一恒定电流源，以及连接在晶体管的发射极之间的电容器。此外，用于提供第二恒定电流的第二恒流源与第一恒定电流源并联连接。给出控制，使得当将空闲状态切换到读取状态时，第二恒定电流源保持打开一段给定的时间。由于该电路，可以在很大程度上缩短空闲状态切换到读取状态的过渡时段或读取状态期间磁头切换的过渡时段。因此，可以抑制再现信号上的不需要的偏移分量的叠加，并且可以最小化数据处理能力的损失。

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