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    • 5. 发明授权
    • Device for driving and controlling optical head for use in optical disk
system
    • 用于驱动和控制用于光盘系统的光头的装置
    • US4835752A
    • 1989-05-30
    • US132167
    • 1987-12-14
    • Keiji NakatsuShigeo HayashiMasaharu OgawaOsamu ItouIsao WatanabeKunimaro Tanaka
    • Keiji NakatsuShigeo HayashiMasaharu OgawaOsamu ItouIsao WatanabeKunimaro Tanaka
    • G11B7/085
    • G11B7/08529G11B7/08517
    • A device for driving and controlling an optical head by forming a spot of a light beam on an optical disk having a plurality of tracks and detecting light from the spot reflected on the optical disk by a pair of optical detectors disposed in the head. This device has: a head actuator for moving a movable portion of the optical head in the radial direction of the disk; a speed detector for detecting the track-crossing speed of the spot from outputs from the optical detectors; a reference speed generator for generating, while accessing to a target track, a reference moving speed signal in accordance with the distance to the target track obtained from the outputs from the optical detectors, the movable head portion being moved on the basis of the reference moving speed signal so that the speed of the movable portion decreases at a position near the target track before the light beam spot reaches this track; a speed error detector for obtaining the difference between outputs from the reference speed generator and the speed detector; and a magnification change circuit adapted for amplifying the outputs from the reference speed generator and the speed detector by a predetermined multiplying factor when the distance between the light beam spot and the target track, or the crossing speed of the spot, becomes smaller than a predetermined value, the magnification change circuit also being adapted for outputting the difference obtained by the speed error detector after multiplying it by the reciprocal of the multiplying factor. The head actuator is driven on the basis of the output from the error detector so as to control the speed of the movable head portion.
    • 一种用于通过在具有多个轨道的光盘上形成光束点并且通过设置在头部中的一对光学检测器从光盘上反射的光点检测光来驱动和控制光学头的装置。 该装置具有:头致动器,用于沿光盘的径向方向移动光头的可移动部分; 速度检测器,用于从光学检测器的输出检测光斑的跟踪交叉速度; 参考速度发生器,用于在根据从所述光学检测器的输出获得的与所述目标轨迹的距离的同时访问目标轨道时生成参考移动速度信号,所述可移动头部基于所述参考移动来移动 使得在光束点到达该轨道之前,可动部分的速度在靠近目标轨道的位置处减小; 用于获得来自基准速度发生器和速度检测器的输出之间的差的速度误差检测器; 以及放大率变化电路,其适用于当光束光点与目标光道之间的距离或点的交叉速度变得小于预定的倍数时,以基准速度发生器和速度检测器的输出放大预定的倍率 值,倍率变化电路也适于输出由速度误差检测器乘以乘法乘数后的差值。 基于来自误差检测器的输出来驱动头致动器,以便控制可动头部的速度。
    • 9. 发明申请
    • FIXING DEVICE AND IMAGE FORMING APPARATUS
    • 固定装置和图像形成装置
    • US20120301162A1
    • 2012-11-29
    • US13479510
    • 2012-05-24
    • Kosuke SASAKINaoki OhashiIsao WatanabeYasuhiro IshiharaHiroyuki Yoshikawa
    • Kosuke SASAKINaoki OhashiIsao WatanabeYasuhiro IshiharaHiroyuki Yoshikawa
    • G03G15/20
    • G03G15/2042
    • A fixing device includes a temperature measuring unit, configured to measure the temperature in regions that extend partially along the outer surface of a heating rotating body, which includes a resistance heating layer, in the circumferential direction and are aligned in the direction of the axis of rotation of the heat rotating body, and a control unit configured to sample temperatures, measured by the temperature measuring unit in each of the regions, over the entire outer surface of the heating rotating body in the circumferential direction by causing the heating rotating body to rotate while supplying a predetermined amount of power to the resistance heating layer, and to determine whether an abnormality has occurred in the resistance heating layer based on the difference between the maximum temperature and the minimum temperature among the sampled temperatures in each region.
    • 定影装置包括温度测量单元,该温度测量单元被配置为测量在包括电阻加热层的加热旋转体的外表面部分沿着圆周方向延伸并且沿轴向方向 热旋转体的旋转以及控制单元,其被配置为通过使加热旋转体旋转而在周向上在加热旋转体的整个外表面上测量由各个区域中的温度测量单元测量的温度 同时向电阻加热层提供预定量的电力,并且基于每个区域中的采样温度之间的最大温度和最低温度之间的差异来确定电阻加热层中是否发生异常。