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    • 6. 发明授权
    • Closed-loop developability control in a xerographic copier or printer
    • 静电复印机或打印机中的闭环显影控制
    • US5559579A
    • 1996-09-24
    • US315018
    • 1994-09-29
    • Mark A. GwaltneyRobert E. Grace
    • Mark A. GwaltneyRobert E. Grace
    • G03G15/00G03G15/08G03G21/00
    • G03G15/0855G03G15/5041G03G15/556G03G2215/00042
    • A developer control for enabling the use of developer and toner materials with widely varying At in high quality xerographic copying and printing. Pixel count data is combined with toner test patch reflectance data during a brief toner rundown to determine the rate of change of density per unit change in toner concentration. During toner rundown, dispensing of toner is suspended for a period of time for effecting toner concentration reduction by approximately 0.25%. The change in Toner Concentration (TC) is estimated using pixel counting. Additionally, toner test patches are created and the reflectance thereof is measured for determining the change in toner density. The estimated TC change and the change in toner density are processed using linear regression to find the average change in density sensor output for the estimated change in TC which is referred to as the rundown slope. The rundown slope is then compared to a target value. If it exceeds the target value by more than ? (a noise factor), the dispense setpoint is reduced by one unit. If the rundown slope is less than the target value by more than ?, the dispense point is increased by one unit. The noise factor, ? is attributable to errors in pixel count or reflectance sensor drift. According to the foregoing, the nominal control line and control band in TC-Tribo space is altered to produce a much wider usable At range.
    • 一种显影剂控制,可以在高质量的静电复印和印刷中使用广泛变化的显影剂和调色剂材料。 像素计数数据在短暂的调色剂破碎期间与调色剂测试贴片反射率数据组合,以确定调色剂浓度每单位变化的密度变化率。 在调色剂粉碎过程中,调色剂的分配暂停一段时间,以使调色剂浓度降低约0.25%。 调色剂浓度(TC)的变化使用像素计数进行估计。 此外,产生调色剂测试贴片并测量其反射率以确定调色剂浓度的变化。 使用线性回归来处理估计的TC变化和调色剂浓度的变化,以找出被称为下降斜率的TC的估计变化的密度传感器输出的平均变化。 然后将衰落斜率与目标值进行比较。 如果超过目标值超过? (噪声因子),分配设定点减少一个单位。 如果破碎斜率小于目标值大于α,则分配点增加一个单位。 噪音因素? 可归因于像素计数或反射率传感器漂移的误差。 根据上述,TC-Tribo空间中的标称控制线和控制带被改变以产生更广泛的可用At范围。