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Image forming method and ink-jet printing device

An inkjet printing device and imaging method technology, applied in the direction of printing device, printing, image communication, etc.

Active Publication Date: 2007-05-02
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the inkjet printing method, after the ink is discharged to the recording medium, the printing liquid permeates the recording medium, and dot spread occurs
[0011] Therefore, when printing is performed using an inkjet printing apparatus that discharges small ink droplets and forms an image (printing), there is a problem of how to print an image pattern indicating that copying of a document image is prohibited

Method used

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  • Image forming method and ink-jet printing device
  • Image forming method and ink-jet printing device
  • Image forming method and ink-jet printing device

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Embodiment Construction

[0046] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0047] An example of a mechanical part of an inkjet printing apparatus that can form multi-valued dots will be described with reference to FIGS. 1 and 2 . FIG. 1 is a side view showing the structure of the mechanical part of the inkjet printing apparatus. Fig. 2 is a plan view showing the structure of the mechanical part of the inkjet printing apparatus.

[0048]As shown in FIGS. 1 and 2, in this inkjet printing apparatus, a carriage 4 is supported by guide rods 2 and pillars 3 (which are guide elements straddling side plates 1A and 1B constituting a frame 1), so that the carriage 4 Can move along the main scanning direction (carriage moving direction). The carriage 4 is moved in the direction indicated by the arrow in FIG. 2 by the main scanning motor 5 through the timing belt 7 which is wound between the drive pulley 6A and the follower pulley 6B.

[0049] The ...

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PUM

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Abstract

An image forming method is provided for use with an ink-jet printing device which forms a dot on a recording medium by ejecting a drop of recording liquid. In the image forming method, an image in which a ground tint is embedded in one of a foreground part and a background part of an original image is formed, the ground tint indicating that copying of the original image is inhibited. A recording liquid adhesion area of the dot per unit area in the foreground part is made different from a recording liquid adhesion area of the dot per unit area in the background part.

Description

technical field [0001] The present invention relates to an image forming method and an inkjet printing apparatus for printing an image, in which a ground tint indicating that copying of an original image is prohibited is embedded. Background technique [0002] Conventionally, there are various printed materials with original images prohibited from copying, including certificates, important documents, etc., such as residence cards, or family register books; and securities, such as banknotes, stocks, bonds, and the like. In order to prevent the impermissible unauthorized copying of the original image of such printed materials, several methods and devices have been proposed which, when reproducing an image, can recognize and distinguish the reproduced image as a copy of the original image. [0003] For example, Japanese Laid-Open Patent Application No. 2004-260341 discloses an image processing apparatus including: an image combining unit that overlaps and combines a target imag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/01G06T1/00B41J5/30H04N1/387B41J29/00
Inventor 佐藤卓木村隆吉田雅一龟井稔人
Owner RICOH KK