Kazuhisa Matsuo

A basic study of the effect of flying ink on tone reproduction using electrostatically attracted ink jets

This paper describes the results of the first quantitative examination of ink flight peculiar to the electrically extracted ink jet method using dielectric ink. In the state of ink flight determined by this method, a continuous cylindrical liquid thread is formed at the nozzle tip, then the ink at the thread end turns into corpuscles and spreads out in mist. The author has already reported the method used for observation and the recording method for tone reproduction. In this paper, an examination was made of the details of average and instantaneous structures of the state of ink flight, covering the wide area from the nozzle tip to the area past the electrodes, and the effect of the state of ink flight on the recording for tone reproduction was studied on the basis of the examination results. Detailed examinations were made of differences in tone, density distribution, and the relation of nozzle diameter to liquid thread diameter and to corpuscle diameter by varying the applied voltages and ink pressures. The results indicate that the ink jet which scatters in an atomized state from the liquid thread is effective in application to a high-quality recording for tone reproduction.

Basic Study of Dyeing on Oshima-Tsumugi-Mushiro by Electrostatically Extracted Ink Jet System

Application of electro-statically extracted ink-jet technology was studied in dyeing processing of Oshima-tsumugi-mushiro. It is needed to dye about 1mm width on that mushiro. Our results showed that, electrostatically extracted ink-jet technology was effective for application to dyeing processing automatically.

Laser observation of flying ink jet electrostatically extracted: main results and application to tone reproduction of images

At present, there are several methods for measuring the diameter of droplets of ink jets. The authors have conceived a method by which not only the droplet diameter but also the state of ink jet flight can be determined using the same optical system by changing the light source only. The electrostatically extracted ink jet method using dielectric ink was used for the experiment. In the case of electrostatically extracted ink jet, a liquid thread of continuous flow is generated from the nozzle tip and disperses in corpuscles from the leading edge of the liquid thread. Observation of dispersing ink flight is difficult by any of the conventional methods. In their study, the state of ink from the liquid thread to corpuscles was observed by controlling applied voltage and ink pressure and with the use of an He-Ne laser beam or dye pulse laser beam depending on the observation objectives. Interesting results obtained are reported in this paper. In designing commercial models of printers using ink jets, their observation method presents new aspects for examining the state of flying ink.

A Method of Tone Reproduction Based on Electrostatic Ink Jet Using Dielectric-ink

本論文は原画の有する階調の連続性を損わずに再生する方法として, 静電誘引形インクジェットの誘電性インクに特有な曳糸性を応用した階調画像の記録について検討したものである.濃度レベルに対応して印加電圧を変化させ, この振幅変調によって曳糸流量を制御する再生方法を試みた.その結果, 低濃度域の再生不良, 濃度帯域の狭いこと, などの問題が判明した.これらに対して, インク静圧を極端に下げれば曳糸が低電圧に起因した微粒子化をせず, 反射濃度0に至るまで階調が連続することを実験的に確認した.そこで独立した対向電極を設けた2本のノズルにそれぞれ異ったインク静圧をかけ, 重ね走査をして濃度帯域を広くする方法を提案した.その他に, 過渡応答性を改善するために条件付きラプラシアン操作を施し, その効果を確認した.