摘要:
Image signal electrodes are so formed on a flexible printed circuit board around developer passing holes as to face a developer carrier. A voltage applied when dots are formed is different from a voltage when dots are not formed. Aperture electrodes are so formed on the flexible printed circuit board as to face opposed electrodes. A voltage consistently lower than the voltage applied to the image signal electrodes is applied when a negative polarity developer is used; in contrast, a voltage consistently higher than the voltage applied to the image signal electrodes is applied when a positive polarity developer is used.
摘要:
A patterned structure including a plurality of patterned sheet members (2, 4, 12, 14, 22, 24, 32, 34) which have respective configurations and which are partially superposed on each other and which cooperate with each other to define a plurality of voids (8, 18, 28, 38). At least one (2, 4, 12, 14, 22, 32, 34) of the sheet members includes a thin-walled portion (2a, 4a, 12a, 12b, 14a, 14b, 22a, 32a, 34a) whose thickness is smaller than a thickness of the other portion (2b, 4b, 12c, 14c, 22b, 32b, 34b). The thin-walled portion is formed by etching the appropriate sheet member or members. The thin-walled portion of one sheet member engages the corresponding thin-walled portion or the other portion of the other sheet member or members.