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    • 4. 发明授权
    • Image forming apparatus which can discriminate frequency of image
forming operations
    • 可以区分图像形成操作的频率的图像形成装置
    • US5321478A
    • 1994-06-14
    • US36242
    • 1993-03-24
    • Akihiro NakamuraJunichi KimizukaTakeji GimaToshiyuki Itoh
    • Akihiro NakamuraJunichi KimizukaTakeji GimaToshiyuki Itoh
    • G03G21/00G03G15/20H04N1/29
    • G03G15/2003
    • An image forming apparatus includes an image forming unit for forming an undeveloped image on a recording material, heating fixing unit for fixing the undeveloped image on the recording material by heating. The heating fixing unit includes a heating member heated by a heater, a temperature detector for detecting a temperature of the heating member, and a current-supply control unit for controlling current supply to the heater so that the temperature detected by the temperature detector is maintained at a predetermined control temperature in a standby state. The apparatus further includes an electric-power reduction unit for reducing or cutting electric power supplied to the heater when an image forming signal is not input for a predetermined time period after the completion of an image forming operation, and a discriminating unit for discriminating the frequency of image forming operations. The electric power reduction unit sets the predetermined time period variably in accordance with frequency of image forming operations discriminated by the discriminating unit.
    • 图像形成装置包括用于在记录材料上形成未显影图像的图像形成单元,用于通过加热将未显影图像固定在记录材料上的加热定影单元。 加热定影单元包括由加热器加热的加热构件,用于检测加热构件的温度的温度检测器,以及用于控制向加热器供电的电流供给控制单元,使得保持由温度检测器检测到的温度 处于待机状态下的预定控制温度。 该装置还包括一个电力减少单元,用于在图像形成操作完成之后的预定时间段内不输入图像形成信号时,减少或切断向加热器供电的电力;以及鉴别单元,用于鉴别频率 的图像形成操作。 电力减少单元根据鉴别单元识别的图像形成操作的频率可变地设置预定时间段。
    • 6. 发明授权
    • Electrophotographic image forming apparatus and its high voltage power
source device
    • 电子照相成像装置及其高压电源装置
    • US5365316A
    • 1994-11-15
    • US107593
    • 1993-08-18
    • Hajime MotoyamaJunichi KimizukaTakeji GimaAkihiro Nakamura
    • Hajime MotoyamaJunichi KimizukaTakeji GimaAkihiro Nakamura
    • G03G15/00G03G15/02G03G15/06G03G15/08
    • G03G15/80G03G15/0283G03G15/065
    • An image forming apparatus includes: a photosensitive drum; a charging unit which is brought into contact with the drum and charges it; a developing unit for obtaining a visible image from an electrostatic latent image formed on the drum; a charge high voltage generation circuit for supplying an output which is obtained by multiplexing a high AC voltage with a high DC voltage with the charging unit; a development high voltage generation circuit for supplying an output which is obtained by multiplexing a high AC voltage with a high DC voltage to the developing unit; and a sync circuit for synchronizing a high voltage alternating current of the charge high voltage generation circuit and a high voltage alternating current of the development high voltage generation circuit. A ratio of the frequencies of the high voltage alternating currents of the development high voltage generation circuit and the charge high voltage generation circuit is set to an integer. The high AC voltages are derived from the signals having an integer frequency dividing ratio which are obtained by frequency dividing the same clock signal.
    • 图像形成装置包括:感光鼓; 充电单元,其与鼓接触并对其进行充电; 显影单元,用于从形成在所述滚筒上的静电潜像获得可视图像; 一个充电高电压产生电路,用于提供通过将高交流电压与高直流电压复用而获得的输出与充电单元; 用于向显影单元提供通过将具有高DC电压的高AC电压复用获得的输出的显影高电压产生电路; 以及同步电路,用于使充电高压发生电路的高电压交流电和显影高压发生电路的高压交流电流同步。 显影高压发生电路和充电高压发生电路的高压交流电流的频率之比设定为整数。 高交流电压由具有通过对相同时钟信号进行分频而获得的整数分频比的信号导出。