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    • 3. 发明授权
    • Phase frequency synchronism circuit and optical receiver
    • 相频同步电路和光接收机
    • US06600797B1
    • 2003-07-29
    • US09517942
    • 2000-03-03
    • Atsushi HasegawaTetsuya AokiTakeshi Yamashita
    • Atsushi HasegawaTetsuya AokiTakeshi Yamashita
    • H03D324
    • H03L7/095H03L7/087H03L7/0891H03L7/113H04L7/033
    • In order to solve the problem that since a loop filter constant suitable for asynchronous state cannot be selected in the conventional phase frequency synchronism circuit, it takes a long time to synchronize the input data and the clock signal from the asynchronous state, the present invention is to propose a phase frequency synchronism circuit including a phase comparator for generating a voltage according to the phase difference of the clock signal to the input signal, a frequency comparator for deciding if the frequency of the clock signal is higher or lower than the transmission rate of the input signal and generating a binary signal, a synchronous identifying unit for deciding if the input signal and the clock signal are synchronized in their phases and frequencies, a first switch that receives the output from the phase comparator and is closed and opened when the synchronous identifying unit decides that they are synchronized and not synchronized, respectively, a second switch that receives the output from the frequency comparator and is opened and closed when the synchronous identifying unit decides that they are synchronized and not synchronized, respectively, a loop filter that receives the outputs from the first and second switches, and a voltage controlled oscillator that oscillates on the basis of the output from the loop filter.
    • 为了解决由于在常规的相位频率同步电路中不能选择适合于异步状态的环路滤波器常数的问题,从异步状态同步输入数据和时钟信号需要很长时间,本发明是 提出一种相位频率同步电路,该相位频率同步电路包括:相位比较器,用于根据时钟信号与输入信号的相位差产生电压;频率比较器,用于判定时钟信号的频率是否高于或低于 输入信号并产生二进制信号,同步识别单元,用于判定输入信号和时钟信号是否在其相位和频率上同步;第一开关,其接收来自相位比较器的输出,并且当同步 识别单元分别决定它们是同步的,而不是同步的 在接收来自频率比较器的输出时,当同步识别单元分别决定它们同步并且不同步时,分别开启和关闭一个接收来自第一和第二开关的输出的环路滤波器和振荡的压控振荡器 在循环滤波器的输出的基础上。
    • 6. 发明授权
    • Image forming apparatus
    • 图像形成装置
    • US09025994B2
    • 2015-05-05
    • US14086483
    • 2013-11-21
    • Takeshi YamashitaYoshie IwakuraYasuhiro Fujiwara
    • Takeshi YamashitaYoshie IwakuraYasuhiro Fujiwara
    • G03G15/16G03G15/01
    • G03G15/0189G03G15/1605G03G15/168
    • An image forming apparatus includes an image bearing member to bear a latent image on a surface thereof, a developing device to develop the latent image with toner, an intermediate transfer member, a secondary transfer member, a cleaning device, and a main body. The cleaning device cleans the secondary transfer member for a predetermined time period T1 during a startup operation after printing is completed normally before subsequent printing. The main body houses the image bearing member, the developing device, the intermediate transfer member, the secondary transfer member, and the cleaning device. At least one of the image bearing member and the developing device constitutes a process cartridge detachably attachable relative to the main body, and in a case in which the process cartridge is installed in the main body, the cleaning device cleans the secondary transfer member for a time period T2 extended from the predetermined time period T1.
    • 图像形成装置包括在其表面上承载潜像的图像承载部件,用调色剂显影潜像的显影装置,中间转印部件,二次转印部件,清洁装置和主体。 清洁装置在打印完成后的正常时间期间的启动操作期间清洁二次转印部件一段预定的时间段T1。 主体容纳图像承载部件,显影装置,中间转印部件,二次转印部件和清洁装置。 图像承载部件和显影装置中的至少一个构成相对于主体可拆卸地安装的处理盒,并且在处理盒安装在主体中的情况下,清洁装置清洁二次转印部件 时间段T2从预定时间段T1延伸。