Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Reexamination Certificate
1999-06-09
2001-12-11
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
C347S095000
Reexamination Certificate
active
06328438
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording method and an apparatus therefor. More particularly, the present invention relates to an ink jet recording method wherein a reaction solution and an ink composition are deposited onto a recording medium to perform printing, and an apparatus therefor.
2. Background Art
Ink jet recording is a printing method wherein droplets of an ink composition are ejected and deposited onto recording media, such as paper, to conduct printing. According to this method, images having high resolution and high quality can be printed at a high speed by means of relatively inexpensive apparatuses. In general, the ink composition used in the ink jet recording comprises water as a main component and, added thereto, a colorant and a wetting agent, such as glycerin, for preventing clogging and other purposes.
On the other hand, an ink jet recording method using two liquids of an ink composition and a reaction solution containing an ingredient capable of thickening or agglomerating ingredients of the ink composition has recently been proposed.
For example, regarding the ink jet recording method, the application of a polyvalent metal salt solution onto a recording medium followed by the application of an ink composition containing a dye having at least one carboxyl group has been proposed (for example, Japanese Patent Laid-Open No. 202328/1993). The claimed advantage of this method is that the polyvalent metal ion combines with the dye to form an insoluble complex, the presence of which can offer images having waterfastness and high quality free from color bleeding.
Further, the use of a color ink comprising at least a surfactant for imparting a penetrating property or a solvent having a penetrating property and a salt in combination with a black ink capable of being thickened or agglomerated through the action of the salt has been proposed in the art (Japanese Patent Laid-Open No. 106735/1994). The claimed advantage of this method is that high-quality color images having high image density and free from color bleeding can be yielded. Specifically, an ink jet recording method has been proposed wherein two liquids, a first liquid containing a salt and a second liquid of an ink composition, are printed to realize good images.
Other ink jet recording methods, wherein two liquids are printed, have also been proposed, for example, in Japanese Patent Laid-Open Nos. 240557/1991 and 240558/1991.
In the ink jet recording methods using two liquids, good printing can be realized by bringing a reaction solution into contact with an ink composition. Upon contact of the reaction solution with the ink composition, the reactant contained in the reaction solution is considered to break the state of dispersion of a colorant and other ingredients in the ink composition to agglomerate them, thereby realizing images having high color density and having no significant feathering and unevenness. Further, in color images, uneven color-to-color intermixing in the region of boundary between different colors, that is, color bleeding, can be effectively prevented.
SUMMARY OF THE INVENTION
The present inventors have now found an ink jet recording method, using two liquids, which enables the two liquids to be printed on a recording medium with high efficiency. Accordingly, it is an object of the present invention to provide an ink jet recording method, using two liquids, which enables the two liquids to be printed on a recording medium with high efficiency.
According to an aspect of the present invention, there is provided an ink jet recording method comprising the steps of: ejecting droplets of two liquids of a reaction solution and an ink composition through respective ink jet recording heads; and depositing the droplets of the reaction solution and the droplets of the reaction solution onto a recording medium so that the reaction solution comes into contact with the ink composition on the recording medium, thereby performing printing,
the reaction solution containing a reactant capable of functioning to agglomerate ingredients of the ink composition,
the ink jet recording heads being reciprocated on the recording medium, the ink composition being deposited onto the recording medium both at the time of motion of the ink jet recording head in the forward direction and at the time of motion of the ink jet recording head in the backward direction, while the reaction solution is deposited onto the recording medium only at the time of motion of the recording head in the forward or backward direction.
According to another aspect of the present invention, there is provided an ink jet recording apparatus for depositing two liquids of a reaction solution and an ink composition onto a recording medium to perform printing, said ink jet recording apparatus comprising:
recording medium carrier means for holding the recording medium and carrying the recording medium in the sub-scanning direction;
reaction solution printing means for ejecting droplets of the reaction solution and depositing the droplets of the reaction solution onto the recording medium;
ink composition printing means for ejecting droplets of the ink composition and depositing the droplets of the ink composition onto the recording medium;
first driving means for reciprocating the reaction solution printing means in the main-scanning direction;
second driving means for reciprocating the ink composition printing means in the main-scanning direction; and
control means for controlling each of the means,
wherein said control means has
a function to deposit the reaction solution from the reaction solution printing means onto the recording medium at the time of motion of the reaction solution printing means in the forward direction and/or in the backward direction while reciprocating the reaction solution printing means in the main-scanning direction by means of the first driving means,
a function to deposit the ink composition from the ink composition printing means onto the recording medium at the time of motion of the recording head in the forward direction and/or the backward direction while reciprocating the ink composition printing means in the main-scanning direction by the second driving means,
a function to control the position of printing so that the reaction solution comes into contact with the ink composition on the recording medium, and
a function to deposit the ink composition onto the recording medium both at the time of motion of the recording head in the forward direction and at the time of motion of the recording head in the backward direction, while the reaction solution is deposited onto the recording medium only at the time of motion of the recording head in the forward or backward direction.
REFERENCES:
patent: 5734403 (1998-03-01), Suga
patent: 6084619 (2000-07-01), Takemoto et al.
patent: 6145961 (2000-11-01), Otsuki
patent: 0534634 (1993-03-01), None
patent: 0679518 (1995-11-01), None
patent: 0726155 (1996-08-01), None
patent: 0726158 (1996-08-01), None
patent: 0726158 A (1996-08-01), None
patent: 0726159 (1996-08-01), None
patent: 0739743 (1996-10-01), None
patent: 0802060 (1997-10-01), None
patent: 03(1991)-240557 (1991-10-01), None
patent: 03(1991)-240558 (1991-10-01), None
Barlow John
Ladas & Parry
Seiko Epson Corporation
Shah M S
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