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Method and apparatus for compensating for malfunctioning nozzle of inkjet image forming apparatus

A technology of imaging devices and nozzles, applied in printing devices, image communication, visual representation of matrix printers, etc., can solve problems such as useless failures and poor printing quality

Inactive Publication Date: 2007-05-30
HEWLETT PACKARD DEV CO LP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this method is useful for compensating for failures of nozzles ejecting black ink, it is not useful for compensating for failures of nozzles ejecting other colors.
Also, when one nozzle is used to compensate for the failure, other colors such as red (yellow + magenta), green (cyan + yellow) or blue (cyan + magenta) will be printed in place of black, so the print quality will deteriorate

Method used

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  • Method and apparatus for compensating for malfunctioning nozzle of inkjet image forming apparatus

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Embodiment Construction

[0035] The matters defined in the description, such as detailed constitution and elements, are intended to assist in a comprehensive understanding of the embodiments of the present invention, and are illustrative only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0036] A method and apparatus for compensating for a malfunctioning nozzle, and an inkjet image forming apparatus employing the same will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. For ease of explanation, an overall exemplary structure of an inkjet image forming apparatus and halftone conversion using dithering are first explained, and then an exemplary...

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Abstract

Provided are a method and apparatus for compensating for the degradation of a print image due to a malfunctioning nozzle that irregularly ejects ink. The method includes detecting a malfunctioning nozzle among nozzles installed in an inkjet image forming apparatus and increasing a dithering threshold of an adjacent position to a compensation position printed by the detected malfunctioning nozzle. The method adjusts a dithering threshold of a print position of the malfunctioning nozzle or a dithering threshold of an adjacent print position, and thus performs a halftoning transaction and prints an image. Accordingly, the degradation of print quality such as a visible white band can be prevented and the lifetime of the printhead can be lengthened.

Description

[0001] This application claims the benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 10-2005-0112198 filed with the Korean Patent Office on November 23, 2005, the entire disclosure of which is hereby incorporated by reference. technical field [0002] The present invention relates to an inkjet imaging device. More particularly, the present invention relates to a method and apparatus for an inkjet image forming apparatus, which can compensate image deterioration caused by a malfunctioning nozzle, and a method of compensating for a malfunctioning nozzle of the inkjet image forming apparatus. Background technique [0003] An inkjet image forming device forms an image by ejecting ink from a print head. The print head is placed a predetermined distance away from the printing medium and reciprocates in a direction perpendicular to a conveying direction of the printing medium. Such an inkjet image forming apparatus is called a shuttle type inkjet image forming appar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/04B41J2/155B41J2/165B41J2/21G06K15/10
CPCB41J2/2139H04N1/405H04N1/4015B41J29/393
Inventor 特雷克霍夫·弗拉迪斯拉夫姜奇珉
Owner HEWLETT PACKARD DEV CO LP
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