公开(公告)号：US3813549A

公开(公告)日：1974-05-28

申请号：US31797372

申请日：1972-12-26

Applicant: IBM

Inventor： DI STEFANO T ,  LAIBOWITZ R ,  ROSENBERG R

IPC: G03G15/02 ,  H01T19/00 ,  H05F3/04

CPC classification number: G03G15/0291 ,  H05F3/04

Abstract: The present invention relates to electrodes used for charging electrophotographic image surfaces in copying machines. More particularly, the disclosure is directed to the negative corona discharge electrodes which produce a negative charge that is applied to the photoconductive surface exposed to the corona discharge. In the present invention, the electrode structure includes a combination of a wire of valve metal with a high resistivity coating spread uniformly over the surface of the wire. The valve metal, one example being tantalum, may serve as the electrode wire itself or may surround an inner wire such as stainless steel. By providing an electrode for corona discharge having a uniform high resistive coating, the plasma glow produced will spread uniformly along the length of the wire. By using a valve metal, which forms a hard oxide under the high resistivity coating, the electrode is self-healing in that if cracks or imperfections occur in the coating, the exposed valve metal will oxidize and fill in the cracks and imperfections.

Abstract translation: 本发明涉及用于在复印机中对电子照相图像表面进行充电的电极。 更具体地，本公开涉及产生施加到暴露于电晕放电的光电导表面的负电荷的负电晕放电电极。 在本发明中，电极结构包括在金属丝的表面均匀扩散的阀金属线与高电阻率涂层的组合。 阀金属，一个例子是钽，可以用作电极线本身，或者可以包围诸如不锈钢的内部线。 通过提供具有均匀的高电阻涂层的电晕放电用电极，产生的等离子体辉光将沿导线的长度均匀扩散。 通过使用在高电阻率涂层下形成硬质氧化物的阀金属，电极是自愈的，因为如果涂层中出现裂纹或缺陷，暴露的阀金属将氧化并填充裂纹和缺陷。