Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1994-04-19
1998-05-05
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347100, B41J 221, G01D 1100
Patent
active
057482080
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for forming a color image by an ink jet recording system.
2. Background Art
Color images are, in general, formed by employing individual colors of yellow, magenta, cyan and black. When dots of these colors are formed by an ink jet recording system, color mixing or flow of one color portion into other color portion in a portion where different colors (in particular, a black portion and a color portion) were in contact with each other means a deterioration in color images. Various proposals have been made for providing sharp color images as follows.
For example, Japanese Patent Laid-Open Nos. 197776/1985, 197777/1985 and 197778/1985 disclose that the deterioration in color images can be prevented by making compositions or properties of inks equal. The publications disclose that the deterioration in color images can be prevented by rendering inks equal to each other in respect of the time of fixation and degree of blurring on a recording material. In the inks described in the publications, however, the degree of blurring cannot be sufficiently reduced so that there is room for improvement in the color images. Furthermore, even in a color printer, a black print is desired to have a quality comparable to print by a conventional monochrome printer. However, the quality of black print formed with a black ink described in the above publications was inferior to that of prints formed with a monochrome printer.
Japanese Patent Laid-Open No. 41171/1991 discloses a method in which printing with a water-base color ink having a surface tension of 30 to 40 mN/m precedes printing with a water-base black ink having a surface tension of 45 to 73 mN/m. The publication describes that it is possible even in a color printer to realize a good black print having quality which is comparable to that of a conventional black print. However, even in this method, it is observed that the black ink "flows into" the color ink portion at a portion where the black portion is in close vicinity to the color portion. As the result, the sharpness of the outline of the black portion becomes unsatisfactory. This is because, when a portion to be black is in contact with the colored portion, there occurs a difference in penetrability of ink between the colored portion where a print has been already formed with a color ink and the portion where a black print is to be formed. Specifically, an ink is more easily penetrated into an portion where a print has been already formed with a color ink than into a portion where no print is formed yet (i.e., a portion to be rendered black). Therefore, when a black ink is applied to a portion in contact with a portion where a color ink has already been applied, the black ink is drawn or flows into the portion where the color ink has been applied. As the result, the sharpness of the color image becomes unsatisfactory. In order to prevent this phenomenon, it may be necessary to use special recording paper having a coated surface.
Thus, in the formation of a color image by an ink jet recording system, there is room for improvement.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an ink jet recording method which can provide a high-quality color image.
Another object of the present invention is to provide a color ink jet recording method which can provide a black print-having a quality comparable to the conventional monochrome print.
The present inventors have now found that the objects can be attained by first printing a color ink to a portion to be rendered black and then printing a black ink to the portion. The present invention has been made based on this finding.
Specifically, the ink jet recording method for printing on a recording medium according to the present invention comprises the steps of: image to be formed, printing first at least one color ink on a portion which is a part of the portion to be black and is in contact with the color portion on a recording medium, prin
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Hayashi Hiroko
Itano Masaaki
Uchiyama, deceased Yaeko
Fuller Benjamin R.
Nguyen Thinh
Seiko Epson Corporation
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