Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2000-08-23
2002-04-30
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S101000, C347S105000
Reexamination Certificate
active
06378983
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a digital prepress system for the purpose of obtaining a good proof sheet.
Conventionally, the printing industry has gone ahead with digitizing the plate-making process and that of preparing the proof sheets by the name of a digital prepress. The digital prepress process comprises a general purpose computer preparing digital data page by page, making an intermediate film or directly a planographic print on the basis of the so obtained digital data. Of these processes, digital prepress systems comprising the general purpose computer preparing the digital data page by page and outputting the planographic prints directly on the basis of the so obtained digital data have started to spread in the industry.
A conventional digital prepress system has had a general purpose computer as the main body, connected with a planographic print preparing system comprising a RIP (Raster Image Processor), a planographic print output unit and an automatic developing device and a proof sheet preparing system comprising a RIP and a DDCP (Direct Digital Color Proofer), as illustrated in FIG.
1
. Since the conventional digital prepress system uses two units of RIP, it has been liable to give rise to the wrong conversion of characters and a double procedure of trapping processing with the result that the finish of regular printed matters is different from that of proof sheets, far from the sufficiently satisfactory proofreading. The digital data are prepared in two byte fonts assigned to them by the general purpose computer, and ordinarily the assigned two byte fonts are selected for use from among those incorporated in the RIPs. Therefore, if the two byte fonts unincorporated in either RIP are used, the wrong conversion of characters or errors occur when the digital data are converted by the RIPs and it has been necessary for the conventional digital prepress systems to have the fonts corresponding to each of the RIPs.
The trapping processing means a processing at a step of printing one image lapped on another wherein either one of the lapped images is made a little larger than the other one to prevent the white ground of paper from appearing on a clearance between the lapped images on account of the deviation of registration upon printing or the expansion or contraction of regular printing paper, and this processing is performed by the software to prepare the digital data or the RIPs but how to process is different depending upon the setting of RIPs. Furthermore, the proof sheets prepared by the DDCP have the color reproduction region different from and narrower than that of the regular printed matters and furthermore the conventional DDCPs have another problem that the recording chart used therein is found to be unsatisfactory for use in proofreading because the recording chart is different from regular printing paper in the color tone, gloss and feel of touch.
SUMMARY OF THE INVENTION
An object of the present invention is to find a solution in the conventional problems as described above and to provide a digital prepress system capable of preparing economically at a low cost an excellent proof sheet unsusceptible to the wrong conversion of characters and a double procedure of trapping processing, having little difference of the images between the regular printed matters and proof sheets with a mutual close likeness of their color reproduction regions and imparting no impression that proofreading paper is different from regular printing paper in color tone, gloss, touch and the like.
The above problems have found a solution with a digital prepress system wherein digital data are processed on a unit of Raster image processor and the so obtained bit data are transferred to a planographic print output unit and an ink jet printer to obtain a planographic print and a proof sheet respectively, said ink jet printer comprising a means for preparing said proof sheets with an arrangement to make ink jet recording on proofreading paper having a color difference of 2 or less and a difference of 75° specular gloss in an absolute value of 15 or less as provided for by JIS Z8730 in comparison with regular printing paper.
The ink jet recording is made preferably with compensating the difference of color reproduction regions between a regular printed matter and a proof sheet using said proofreading paper.
The basis weight of said proofreading paper is preferably different from that of regular printing paper by −10% or more to +50% or less.
Said proofreading paper is preferably coated paper comprising one or more ink-receiving layers containing a porous pigment on the top of a support.
Said ink jet printer records preferably by using ink comprising 6 colors or more.
REFERENCES:
patent: 6203899 (2001-03-01), Hirose et al.
patent: 8-99459 (1996-04-01), None
patent: 8-207422 (1996-08-01), None
Partial translation of Japan Printer, published on Apr. 15, 1999.
Ito Shin'ichi
Nakao Kazuhisa
Tokunaga Kozi
Mitsubishi Paper Mills Limited
Nguyen Thinh
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