公开(公告)号：US4581619A

公开(公告)日：1986-04-08

申请号：US722398

申请日：1985-04-12

申请人： Atsushi Mizutome ,  Hiroshi Inoue ,  Akio Yoshida ,  Satoshi Yoshihara

发明人： Atsushi Mizutome ,  Hiroshi Inoue ,  Akio Yoshida ,  Satoshi Yoshihara

IPC分类号： B41J2/445 ,  B41J2/465 ,  G02F1/133 ,  G02F1/136 ,  G02F1/1368 ,  G06K15/12 ,  G02F1/03

CPC分类号： G06K15/1238 ,  B41J2/445 ,  B41J2/465

摘要： An image forming apparatus comprises an exposure light source, an image bearing member and a printer head interposed therebetween. The printer head has a micro-shutter array which comprises a plurality of micro-shutters arranged in a matrix comprising a plurality of rows and a plurality of columns. Each micro-shutter comprises a first electrode connected to a terminal of a thin film transistor, a second electrode forming a common electrode and a liquid crystal interposed therebetween. On the first electrode is further provided an opposing conductor film through an insulating film, whereby a charge storage capacitor is formed. Because of the charge storage capacitor, an effective voltage applied across the liquid crystal is kept at a high level, whereby an optical signal with good contrast is given to the image bearing member even when the printer head is driven according to a high degree of time-division scheme.

摘要翻译： 图像形成装置包括曝光光源，图像承载部件和插入其间的打印头。 打印头具有微快门阵列，其包括布置成包括多行和多列的矩阵的多个微快门。 每个微快门包括连接到薄膜晶体管的端子的第一电极，形成公共电极的第二电极和介于其间的液晶。 在第一电极上还通过绝缘膜设置相对的导体膜，由此形成电荷存储电容器。 由于电荷存储电容器，所以施加在液晶两端的有效电压保持在高电平，由此即使当打印头被高度地驱动时，图像承载部件也具有良好对比度的光学信号 细分方案。