公开(公告)号：US4030106A

公开(公告)日：1977-06-14

申请号：US615795

申请日：1975-09-22

申请人： Friedrich Bestenreiner ,  Josef Helburger ,  Wolfgang Ruf

发明人： Friedrich Bestenreiner ,  Josef Helburger ,  Wolfgang Ruf

IPC分类号： G03G15/32 ,  H04N1/401 ,  G03G15/044

CPC分类号： G03G15/325 ,  H04N1/4015

摘要： An electric charge is created on a moving reproduction carrier by each of a plurality of electrodes extending in a line perpendicular to the direction of transport of the reproduction carrier. Each of the signals applied to the electrodes has an amplitude corresponding to the density of the corresponding point of the original. The charge created by the electrode has undesirable variations resulting from differences in the electrode characteristics and from differences in the amplifiers amplifying the signal before application to each electrode. After each charge distribution from a copy has been created, a test signal is supplied to the inputs of all amplifiers. This creates a test charge distribution on the reproduction carrier. After developing of the reproduction carrier the test line created by developing of the test charge distribution is scanned photoelectrically. A differential amplifier compares each of the so-scanned signals with a reference signal and furnishes an error signal as a function of the difference therebetween. The error signal is utilized to vary the gain of the amplifier associated with the electrode.

摘要翻译： 通过在垂直于再现载体的传送方向的一行中延伸的多个电极中的每一个产生在移动再现载体上的电荷。 施加到电极的每个信号具有对应于原始对应点的密度的幅度。 由电极产生的电荷具有由电极特性的不同导致的不期望的变化，以及在施加到每个电极之前放大信号的放大器的差异。 在创建了从副本的每个电荷分配之后，将测试信号提供给所有放大器的输入。 这会在再现载体上产生测试电荷分布。 在再现载体的开发之后，通过显影测试电荷分布产生的测试线被光电扫描。 差分放大器将所扫描信号中的每一个与参考信号进行比较，并提供作为它们之间的差的函数的误差信号。 误差信号用于改变与电极相关联的放大器的增益。