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    • 2. 发明授权
    • Magneto-optical recording/reproducing system having an electromagnetic
actuator
    • 具有电磁致动器的磁光记录/再现系统
    • US5305294A
    • 1994-04-19
    • US040263
    • 1993-03-30
    • Kenjiro KimeKeiji NakamuraIsao WatanabeHajime Nakajima
    • Kenjiro KimeKeiji NakamuraIsao WatanabeHajime Nakajima
    • G01B11/02G11B7/09G11B11/105G11B13/04
    • G11B11/10534G01B11/026G11B11/10556G11B11/10576G11B7/0937
    • Magneto-optical disk recording and reproducing devices and actuators and distance detectors for use therewith are disclosed. The mageneto-optical disk device comprises, in addition to the usual elements, a bimorph type actuator or an electromagnetic actuator for driving the magnetic head of the magneto-optical disk device. The bimorph actuator has a metallic shim whose width varies with respect to the longitudinal distance inversely porportional to the normal function of the first or the second free natural vibration mode. Alternatively, the bimorph type actuator have a recess formed on a bimorph element to expose a piezoelectric crystal which outputs a voltage corresponding to the acceleration of the vibration of the actuator; the driver circuit of the actuator reduces the driving voltage when the frequency of the voltage generated at the recess comes into the neighborhood of a higher resonance frequency of the actuator. The optical distance detector comprises a light-emitting diode and a pair of photodiodes which detects the amount of light incident thereon after being reflected at a surface of an object the distance to which is measured. The geometric parameters of the photodiodes are selected in such a manner that the output of a first photodiode decreases as the measured distance increases while the output of a second photodiode increases as the measured distance increases. Thus, the normalized differential output of the two photodiodes, from which the measured distance is determined, varies substantially linearly with respect to the measured distance. In preferred forms, the photodetectors have stepped concentric configurations so that small distances can be measured accurately and efficiently.
    • 公开了磁光盘记录和再现装置以及与其一起使用的致动器和距离检测器。 除了通常的元件之外,磁光盘装置还包括用于驱动磁光盘装置的磁头的双压电晶片型致动器或电磁致动器。 双压电晶片致动器具有金属垫片,其宽度相对于纵向距离与第一或第二自由自然振动模式的正常功能相反地成比例地变化。 或者,双压电晶片型致动器具有形成在双晶片元件上的凹部,以暴露出输出与致动器的振动的加速度相对应的电压的压电晶体; 当在凹部处产生的电压的频率进入致动器的较高谐振频率附近时,致动器的驱动器电路降低驱动电压。 光学距离检测器包括发光二极管和一对光电二极管,其在被测量的距离的物体的表面处被反射后检测入射到其上的光量。 选择光电二极管的几何参数,使得第一光电二极管的输出随测量距离的增加而减小,而第二光电二极管的输出随测量距离的增加而增加。 因此,确定测量距离的两个光电二极管的归一化差分输出相对于测量的距离基本上线性地变化。 在优选的形式中,光电检测器具有阶梯同心配置,使得能够精确而有效地测量小的距离。
    • 7. 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。