Inkjet printer with printing head ejecting ink in line

A technology of inkjet printers and line heads, which is applied in printing and inking devices, etc., and can solve problems such as unevenness of density

Active Publication Date: 2008-10-01
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This variation in the amount of ink ejection causes density unevenness in the image formed on the printing medium

Method used

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  • Inkjet printer with printing head ejecting ink in line
  • Inkjet printer with printing head ejecting ink in line
  • Inkjet printer with printing head ejecting ink in line

Examples

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Embodiment Construction

[0026] The first embodiment of the present invention will be described below with reference to these drawings.

[0027] First, a printer to which the method of correcting the ink ejection amount according to the first embodiment of the present invention is applied will be described with reference to FIG. 1. The printer 1 shown in FIG. 1 is a line-head color ink-jet printer, which has four fixed ink-jet heads 2, each of which is shaped along a direction perpendicular to the paper shown in FIG. 1 in a plan view. An elongated narrow rectangle. In FIG. 1, the printer 1 has a paper feeding unit 14 provided in a lower part thereof, a paper receiving part 16 provided in an upper part thereof, and a conveying unit 20 provided in a middle part thereof. The printer 1 also has a controller 100 for controlling the operation of the printer 1 (see Figure 6 ).

[0028] The paper feeding unit 14 has a paper storage portion 15 and a paper feeding roller 45. The rectangular printing paper P stacke...

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PUM

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Abstract

A line head inkjet printer includes an inkjet head, a storage unit, and a controller. The controller generates n kinds waveforms with differnt ink quantity injected from the nozzle (3<=n (natural number)). The storage unit is aim at the combination of m kinds waveforms selected from n kinds waveforms of each region block including at least one nozzle (2<=m (natural number)<=n-1). When the printer processes grayscale printing using m kinds waveforms selected from the n kinds waveforms, the difference of the aspect of the ink injecting amount of each nozzle between these blocks is smaller than the difference of the same combination using m kinds waveforms aimed at the all blocks under the condition of using the combination of the storaged M kinds waveforms aimed at each region block.

Description

Technical field [0001] The present invention relates to a line head inkjet printer that ejects ink from nozzles to form an image. Background technique [0002] The inkjet head includes a large number of nozzles for inkjetting and ink flow channels respectively connected to these nozzles. These ink flow channels include pressure chambers for generating ejection pressure. By ejecting a desired amount of ink from the nozzle to the printing medium, an image can be formed on the printing medium. In this type of inkjet head, the amount of ink ejected from each nozzle varies with the dimensional accuracy and assembly accuracy of the flow channel unit. This change in the ink ejection amount may cause density unevenness in the image formed on the printing medium. Accordingly, there is known a technique in which: the amount of ink ejected from each nozzle is estimated from the printing result, thereby generating a correction table; and the correction table is used during printing to indivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/14B41J2/07
CPCB41J2002/14306B41J2002/14459B41J2002/14225B41J2002/14217B41J2202/20
Inventor 坂井田惇夫铃木克明
Owner BROTHER KOGYO KK
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