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    • 2. 发明授权
    • Laser driving method and apparatus and image-forming apparatus
    • 激光驱动方法及装置及成像装置
    • US06396858B2
    • 2002-05-28
    • US09257934
    • 1999-02-26
    • Takayuki KawakamiTomobumi NakayamaIsamu SatoTatsuhito KataokaKatsuhide KogaYukio Yokoyama
    • Takayuki KawakamiTomobumi NakayamaIsamu SatoTatsuhito KataokaKatsuhide KogaYukio Yokoyama
    • H01S313
    • H01S5/0683H01S5/4025
    • A laser driving method is adapted for driving a plurality of laser emitting devices. A first current to be supplied to each of the plurality of laser emitting devices is always generated. A plurality of second currents controlled according to a control signal supplied from the outside are generated when necessary. The plurality of second currents are supplied to the respective laser emitting devices under supply of the respective first currents, thereby making the laser emitting devices emit respective laser beams. The plurality of laser emitting devices are caused to emit the laser beams in time division at predetermined timing to detect each of emitted light amounts by one laser monitor. Adjustment is made to at least one of the first current and the second current supplied to each of the laser emitting devices according to a plurality of detected light amounts detected. Supply of the current to the laser emitting devices not driven is stopped when the plurality of laser emitting devices are adjusted in light amount in time division.
    • 激光驱动方法适于驱动多个激光发射装置。 始终产生要提供给多个激光发射装置中的每一个的第一电流。 当需要时,产生根据从外部提供的控制信号控制的多个第二电流。 多个第二电流在各自的第一电流的供给下被提供给各个激光发射装置,从而使激光发射装置发射各自的激光束。 使多个激光发射装置在预定定时以时分方式发射激光,以通过一个激光监视器检测每个发射光量。 根据检测到的多个检测光量,对提供给每个激光发射装置的第一电流和第二电流中的至少一个进行调整。 在多个激光发射装置以时间分光调整的情况下,停止向未驱动的激光发射装置提供电流。
    • 3. 发明授权
    • Image forming apparatus
    • 图像形成装置
    • US06266078B1
    • 2001-07-24
    • US09219599
    • 1998-12-23
    • Katsuhide KogaTomobumi NakayamaIsamu SatoTatsuhito KataokaYukio YokoyamaTakayuki Kawakami
    • Katsuhide KogaTomobumi NakayamaIsamu SatoTatsuhito KataokaYukio YokoyamaTakayuki Kawakami
    • B41J2435
    • H04N1/4005G02B26/123G06K15/1204H04N1/40037
    • An image forming apparatus, including a driving circuit for a multichip laser chip, which can limit or interrupt emission of laser light sources in accordance with a result of comparison of an optical output of each laser light source with a limiting value during time-division control is provided. The apparatus includes a plurality of laser light source, a light-amount control device for controlling an optical output of a laser beam from each of the plurality of laser light sources to a constant amount of light by performing time division processing, and a light detection device for detecting optical outputs of the plurality of laser light sources. The light detection device includes sensor units whose number is smaller than the number of the plurality of laser light sources. The apparatus also includes a limiting-value setting device for setting a limiting value for each optical output, a comparison device for comparing a time-division detection signal for a laser beam detected by the light detection device with the limiting value set by the limiting-value setting means during the time-division light-amount control by the light-amount control device, an emission control device for controlling emission of the plurality of laser light sources in accordance with an output signal from the comparison device, and a recording medium on which an image is formed by the plurality of laser beams.
    • 一种图像形成装置,包括用于多芯片激光芯片的驱动电路,其可以根据在每个激光光源的光输出与在时分控制期间的限制值进行比较的结果来限制或中断激光光源的发射 被提供。 该装置包括多个激光光源,光量控制装置,用于通过执行时分处理来控制来自多个激光源中的每一个的激光束的光输出到恒定量的光,以及光检测 用于检测多个激光光源的光输出的装置。 光检测装置包括数量小于多个激光光源的数量的传感器单元。 该装置还包括用于设置每个光学输出的限制值的限制值设置装置,用于将由光检测装置检测的激光束的时分检测信号与由限制值设定的限制值进行比较的比较装置, 在光量控制装置的分时光量控制期间的值设定装置,根据来自比较装置的输出信号控制多个激光光源的发射的发光控制装置,以及记录介质 由多个激光束形成图像。
    • 8. 发明授权
    • Apparatus for measuring magnetic field of microwave-assisted head
    • 用于测量微波辅助头磁场的装置
    • US08027110B1
    • 2011-09-27
    • US12844348
    • 2010-07-27
    • Noboru YamanakaTomoyuki SasakiTakuya AdachiIsamu SatoHiroshi Ikeda
    • Noboru YamanakaTomoyuki SasakiTakuya AdachiIsamu SatoHiroshi Ikeda
    • G11B27/36
    • G01R33/091G11B5/314G11B2005/0024
    • A measurement circuit system of a magnetic field measurement apparatus of the present invention includes an amplifier, a mixer circuit and a band-pass filter that are connected in order on an output end side of a microstrip line or a coplanar wave guide, which is an in-plane high frequency magnetic field intensity measurement element, a frequency immediately before being inputted in the band-pass filter is down-converted by the mixer circuit to a frequency so that a band width of the band-pass filter can be used, the band-pass filter uses a narrow band of ±0.5-±10 KHz (1 KHz-20 KHz as a bandwidth) centering a fundamental frequency selected from 5-20 MHz that is down-converted by the mixer circuit as a center peak passing frequency, and the measurement circuit system is configured to obtain 3 dB or greater of a signal-to-noise ratio (SNR) that is a ratio of S with N; where S represents the reproduction voltage (reproduction output) of the high frequency reproduction signal induced by the in-plane high frequency magnetic field intensity measurement element, and N represents a total noise voltage of a circuit noise including a noise generated by the in-plane high frequency magnetic field intensity measurement element. Therefore, the in-plane high frequency magnetic field that a microwave-assisted magnetic head generates can be measured with high reliability and precision.
    • 本发明的磁场测量装置的测量电路系统包括在微带线或共面波导的输出端侧依次连接的放大器,混频器电路和带通滤波器,它是 在平面内的高频磁场强度测量元件中,紧接在带通滤波器中输入的频率由混频器电路下变频到频率,使得可以使用带通滤波器的带宽, 带通滤波器采用±0.5〜10KHz(1KHz-20KHz作为带宽)的中心峰值通过频率,该频带以选择5-20MHz的基频为中心,由频率调制器电路进行下变频 并且测量电路系统被配置为获得S与N的比率的3dB或更大的信噪比(SNR); 其中S表示由面内高频磁场强度测量元件感应的高频再现信号的再现电压(再现输出),N表示包括由平面内高频磁场强度测量元件产生的噪声的电路噪声的总噪声电压 高频磁场强度测量元件。 因此,可以高可靠性和精度地测量微波辅助磁头产生的平面内高频磁场。
    • 10. 发明授权
    • Magnetoresistive element and magnetoresistive device having a free layer stabilized by an in-stack bias
    • 具有通过叠层间偏压稳定的自由层的磁阻元件和磁阻器件
    • US07583482B2
    • 2009-09-01
    • US10998637
    • 2004-11-30
    • Rachid SbiaaIsamu SatoHaruyuki Morita
    • Rachid SbiaaIsamu SatoHaruyuki Morita
    • G11B5/33
    • H01L43/08B82Y10/00B82Y25/00G11B5/1278G11B5/3909G11B5/3932G11B2005/0018G11B2005/0029G11B2005/3996
    • An in-stack bias is provided for stabilizing the free layer of a ballistic magneto resistive (BMR) sensor. In-stack bias includes a decoupling layer that is a spacer between the free layer and a ferromagnetic stabilizer layer of the in-stack bias, and an anti-ferromagnetic layer positioned above the ferromagnetic layer. The spacer is a nano-contact layer having magnetic particles positioned in a non-magnetic matrix. The free layer may be single layer, composed or synthetic, and the in-stack bias may be laterally bounded by the sidewalls, or alternatively, extend above the sidewalls and spacer. Additionally, a hard bias may also be provided. The spacer of the in-stack bias results in the reduction of the exchange coupling between the free layer and ferromagnetic stabilizing layer, an improved AΔR due to confinement of current flow through a smaller area, and increased MR due to the domain wall created within the magnetic nano-contact.
    • 提供堆叠偏压以稳定弹道磁阻(BMR)传感器的自由层。 堆叠内偏压包括去耦层,其是自由层与堆叠内偏压的铁磁稳定层之间的隔离层,以及位于铁磁层上方的反铁磁层。 间隔物是具有位于非磁矩阵中的磁性颗粒的纳米接触层。 自由层可以是单层的,组成的或合成的,叠层间偏压可以由侧壁横向界定,或者替代地在侧壁和间隔物上方延伸。 另外,还可以提供硬偏压。 堆叠偏压的间隔物导致自由层和铁磁稳定层之间的交换耦合的减少,由于电流流过较小区域的限制而导致的改进的ADeltaR以及由于在 磁性纳米接触。