The Paper's Abstract of The 3rd
International Conference on Imaging Science and Hardcopy

Dot Modulation Color Printing by Ion Flow Process

May 26-29,1998
Chongqing China

　Makoto Omodani, Masashi Fujita, Masaru Ozawa, 
Masataka Ohta, Yasusuke Takahashi

Department of Electro-Photo Optics Btokai University
1117  Kitakaname, Hiratsuka-Shi, Kanagawa B259-12, Japan
Phone:  +81-463-58-1211 ext. 4425  Fax:    +81-463-58-7187
E-mail:  omodani@keyaki.cc.u-tokai.ac

      Ion flow printing have a clear advantage for high quality color printing because of its ability of dot modulation.  A prototype color printer, which can print 500 mm width of high quality pictorial image, is developed. The width of 500 mm was covered by using two ion projection heads of 250 mm width. Gray scale of 256 levels,  resolution of 300 dpi, and printing width of 500 mm is achieved by totally 6000 of apertures for  ion projection.  Gray levels of 256 steps in each color is accomplished by controlling the ion projection time period for each color dots of Cyan, Magenta, Yellow, and Black. High quality continuous tone color reproduction and low granularity is realized by using liquid toner development process. Uniformity of optical density in the wide printing area is measured and confirmed to be sufficient for practical applications.  Ion flow printing is thus concluded feasible for high quality wide format color printing.  

中国复印科学与工程学会
Reprographic Scientists and Engineers Society of China 
7 Chang-Tu Rd.Tianjin300131,China  Tel:(22)26669189 Fax: (22)26669189 
E-mail: rsesc@public.tpt.tj.cn
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