Investigation of Water Jet Phenomenon and its Application for Imaging Technology

水射流现象及其在成像技术中的应用研究

基本信息

批准号：
16360127
负责人：
KAWAMOTO Hiroyuki
金额：
$ 8.96万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360127/
关键词：
Inkjet Electrostatic Force Corona Discharge Taylor Cone Imaging Technology Micro Splaying Electronic Circuit 気体放電

项目摘要

An investigation was conducted on electrostatic formation of a liquid drop. High voltage was applied between an insulative capillary tube filled with water and a metal plate electrode. Formation of a water drop was observed at the dark discharge under conditions of appropriate voltage application and water level. Although the electrostatic attractive Coulomb force is small, in the order of 10 μN at the voltage lower than the corona onset, it is large enough to separate the water drop to the capillary tube against surface tension at certain conditions. The diameter of the drop was about one millimeter. At the beginning of corona discharge, however, water mist was dispersed at wide angle from the tip of the tube due to the Coulomb repulsive force of charged mist. It was observed that a Taylor cone of water was formed at the tip of a tube and the tip of the cone was broken to form a very small droplet at the beginning of the corona discharge. When the applied voltage was further increased … More , water mist became to be dispersed like spray, because the ionic wind prevented the separation and spread of the droplet.The formation of a small droplet was controlled by the application of pulse voltage. The diameter of the droplet, depended on the applied voltage and the tube diameter. The droplet volume was in the order of several hundred picoliters. Preliminary inkjet printing on a paper was also demonstrated and succeeded in printing 1,270 dpi kanji character. Another experimental set-up was constructed to control the dropping position of the droplet. A ring electrode was settled between the capillary tube and the plate electrode to control the dropping position of the droplet.However the print speed was deadly slow because this system had only single nozzle. Therefore we have been developing a multi-nozzle system that consisted of two parallel tubes filled with ink and the metal plate electrode. Three-dimensional calculation of the electric field was conducted by the Finite Difference Method to deduce the cross-talk between the electrodes and it is proposed that a new system that the waveform of the applied voltage was adjusted to cancel the cross-talk between the adjacent nozzle.We have been also developing a mask-less printing technology for microelectronic circuits utilizing an electrostatic inkjet system. Drops of paste that contained Ag nano-particles were injected on a substrate by the electrostatic force to form electrode patterns. The formation of the drop was controlled by the application of pulse voltage between the plate electrode and a fine tube that contains Ag paste. It was demonstrated that line electrodes of 200 μm pitch were successfully printed on a glass substrate. A multi-layered printing was also realized by over coating glass paste on the electrode.I conclusion, this phenomenon is expected to be utilized for a new inkjet print head. Less

对液滴的静电形成进行了研究，在充满水的绝缘毛细管和金属板电极之间施加高电压，在适当的电压施加和水位的条件下观察到水滴的形成。尽管静电吸引力库仑力很小，在低于电晕起始的电压下约为 10 μN，但在某些条件下，它足够大以克服表面张力将水滴分离到毛细管。然而，在电晕放电开始时，由于带电雾的库仑排斥力，水雾从管的尖端以大角度分散。观察到在尖端处形成了泰勒水锥。电晕放电开始时，管子和锥体尖端破裂，形成非常小的液滴。当施加的电压进一步增加时，水雾变得像喷雾一样分散，因为离子风阻止了水雾。分离小液滴的形成是通过施加脉冲电压来控制的，液滴的直径取决于所施加的电压和管直径。液滴体积约为数百皮升。还演示了在纸上进行喷墨打印，并成功打印了 1,270 dpi 的汉字字符。另一个实验装置被构建来控制液滴的滴落位置。然而，由于该系统只有单个喷嘴，因此打印速度非常慢，因此我们一直在开发一种由两个充满墨水的平行管和金属板组成的多喷嘴系统。采用有限差分法对电场进行三维计算，推导出电极间的串扰，并提出了一种调整外加电压波形来消除电极间串扰的新系统。相邻的我们还开发了一种用于微电子电路的无掩模印刷技术，利用静电喷墨系统将含有银纳米粒子的浆料液滴通过静电力喷射到基板上以形成电极图案。通过在板电极和含有银膏的细管之间施加脉冲电压来控制，证明了在玻璃基板上成功印刷了200μm间距的线电极。也可以通过在电极上涂覆玻璃浆来实现。我的结论是，这种现象有望用于新型喷墨打印头。