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    • 5. 发明授权
    • Apparatus for detecting a level of liquid
    • 用于检测液体水平的装置
    • US5369396A
    • 1994-11-29
    • US58590
    • 1993-05-07
    • Nobuo KurataHiroshi Tooyama
    • Nobuo KurataHiroshi Tooyama
    • F01M11/12G01F23/00G01F23/74H01H36/02G08B21/00
    • F01M11/12G01F23/0092G01F23/74H01H36/02F16N2250/08F16N2260/04
    • An apparatus for detecting a liquid level includes a warning device for warning a low liquid level, and a regulator for controlling power supply to the warning device from a power source. The regulator comprises a switch for switching its condition in accordance with the liquid level. The ON condition of the switch indicates that the present liquid level is lower than a predetermined liquid level. The regulator further comprises a thermistor connected to the switch in series. The thermistor has a characteristic of decreasing the resistance value thereof, when a predetermined delay period of time as a function of atmospheric temperature has elapsed since the start of applying the voltage on the thermistor, synchronizing with turning the switch on. The low resistance value of the thermistor allows the power for activating the warning device to be supplied to its device, while the switch is turned on.
    • 用于检测液位的装置包括用于警告低液位的警告装置和用于从电源控制对警告装置的电力供应的调节器。 调节器包括用于根据液位切换其状态的开关。 开关的ON状态表示本液位低于规定液面。 调节器还包括串联连接到开关的热敏电阻。 热敏电阻具有降低其电阻值的特性,当从开始施加电压到热敏电阻上开始经过了作为大气温度的函数的预定延迟时间段时,与打开开关同步。 当开关打开时,热敏电阻的低电阻值允许启动报警装置的电源供应到其装置。
    • 6. 发明授权
    • Device for optically tracking information
    • 用于光学跟踪信息的设备
    • US4541082A
    • 1985-09-10
    • US443033
    • 1982-11-19
    • Tatsuo HorikoshiSeiji YonezawaToshiaki TsuyoshiHiroshi TooyamaMasatoshi Otake
    • Tatsuo HorikoshiSeiji YonezawaToshiaki TsuyoshiHiroshi TooyamaMasatoshi Otake
    • G11B7/09G11B7/12G11B21/10
    • G11B7/0901
    • A device for optically tracking information recorded on an optical disc wherein a photodetector is disposed on the optical axis of an optical system for guiding diffracted waves to the photodetector. The origin of a fictitious X-Y coordinate system at the photodetector is placed on the above-mentioned optical axis, X- and Y-axes of the coordinate system are made parallel to and perpendicular to an information track having the information pits on the rotating recording medium, and the photodetector is divided into four equal parts. A first summation signal indicating the sum of output signals from the four parts of the photodetector is converted into a binary signal, and a difference signal between second summation signals each indicating the sum of output signals from a pair of photodetector parts facing each other with the origin of the coordinate system therebetween is converted into another binary signal. A signal indicating a direction in which the light beam deviates from the information track, is formed on the basis of the above-mentioned binary signals, and a tracking signal indicating the deviation of the light beam from the information track is formed by full-wave rectifying the difference signal and modifying the rectified signal with the above-mentioned direction indicating signal.
    • 一种用于光学跟踪记录在光盘上的信息的装置,其中光电检测器设置在用于将衍射波引导到光电检测器的光学系统的光轴上。 将光电检测器上的虚拟XY坐标系的原点置于上述光轴上,坐标系的X轴和Y轴平行于和垂直于在旋转记录介质上具有信息凹坑的信息轨道 ,并且光电检测器被分成四等份。 指示来自光电检测器的四个部分的输出信号之和的第一求和信号被转换为二进制信号,以及第二求和信号之间的差分信号,每个信号表示来自一对彼此面对的光检测器部分的输出信号之和, 其间的坐标系的原点被转换为另一个二进制信号。 基于上述二进制信号形成指示光束偏离信息轨道的方向的信号,并且指示光束与信息轨道的偏离的跟踪信号由全波形成 整流差分信号,并用上述方向指示信号修正整流信号。