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    • 43. 发明授权
    • Electrostatic copying apparatus
    • 静电复印机
    • US4310238A
    • 1982-01-12
    • US181609
    • 1980-08-27
    • Manabu MochizukiSeiichi MiyakawaTaro KimuraJunichiro Hashimoto
    • Manabu MochizukiSeiichi MiyakawaTaro KimuraJunichiro Hashimoto
    • G03G15/10G03G15/00
    • G03G15/105Y10S222/01
    • First and second sensors (37), (39) are provided in a developing tank (36) containing a liquid developer consisting of a liquid carrier or dispersant and toner particles dispersed in the carrier. The first sensor (37) measures the electrical resistivity of the developer whereas the second sensor (39) measures the optical transmissibility thereof. Additional toner is supplied into the developer to maintain the transmissivity at a value which is a predetermined function of the resistivity. The transmissibility value is reduced as the resistivity increases, thereby maintaining the copy image density constant. The first sensor (37) includes two electrodes immersed in the developer and an A.C. or D.C. voltage is applied thereacross. The current flow through the electrodes (37) and thereby the developer is measured to determine the resistivity of the developer. Where the applied voltage is D.C., an arrangement is provided to mechanically scrape accumulated developer off the electrodes (37) at intermittent intervals.
    • 第一和第二传感器(37),(39)设置在包含由液体载体或分散剂组成的液体显影剂和分散在载体中的调色剂颗粒的显影槽(36)中。 第一传感器(37)测量显影剂的电阻率,而第二传感器(39)测量其透光率。 附加的调色剂被供应到显影剂中以将透射率保持在作为电阻率的预定函数的值。 透射率值随着电阻率的增加而减小,从而保持复印图像的密度不变。 第一传感器(37)包括浸在显影剂中的两个电极,并且在其上施加交流或直流电压。 测量通过电极(37)和由此显影剂的电流流动以确定显影剂的电阻率。 在施加的电压为直流电的情况下,提供了一种布置以间歇地间隔地将积聚的显影剂从电极(37)上刮除。