Inkjet image forming apparatus

a technology of inkjet image and forming apparatus, which is applied in the direction of electrical apparatus, printing, pictoral communication, etc., can solve the problems of insufficient density adjustment for low and high density levels, and achieve the reduction of density difference between ink heads, density difference, and density difference.

Active Publication Date: 2015-05-28
RISO KAGAKU CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010]According to the aspect, the halftone processing is not done for the lowest density level, so that a density difference can be reduced without generation of a colorless portion(s). In addition, the halftone processing is done for other density levels than the lowest density level in addition to the density adjustment by the drive voltage controller, so that a density difference can be reduced also at the other density levels. As a result, the density adjustment can be done so that the density difference among the ink heads is reduced at all the density levels.

Problems solved by technology

Therefore, the density adjustment for the low and high density levels is subject to become insufficient.

Method used

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Embodiment Construction

[0025]Hereinafter, an inkjet image forming apparatus 1 according to an embodiment will be explained with reference to the drawings.

[0026]The inkjet image forming apparatus 1 is an inkjet type line color printer by which printing is done per line by injecting ink droplets from nozzles of ink heads 12 provided on a head unit 10 served as an image forming unit. In addition, each of the ink heads 12 is a multi-drop type ink head that injects ink droplets sequentially from its single nozzle onto a single dot. A density level of the single dot can be changed according to the number of ink droplets (an amount of ink droplets) injected from the single nozzle onto the single dot.

[0027]As shown in FIG. 1, the inkjet image forming apparatus 1 includes an image forming path CR1 served as its feed path. Along the image forming path CR1, print sheet P are fed by a platen belt 20 with a feed speed preset according to a print setting. The head unit 10 is provided above the image forming path CR1 so...

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Abstract

An inkjet image forming apparatus includes ink heads, a drive voltage controller that adjusts density by controlling each drive voltage of the ink heads, a halftone processing controller that adjusts density by changing the number of ink droplets ejected from each nozzle of the ink heads, and a density adjustment controller that prints and scans a density adjustment pattern to calculate an adjustment value of each density level. The density adjustment controller adjusts density of a lowest density level so that the drive voltage controller controls each drive voltage based on the adjustment value of the lowest density level, and adjusts density of each density level other than the lowest density level so that the halftone processing controller changes the number of ink droplets based on the adjustment value of each density level other than the lowest density level and the adjustment result by the drive voltage controller.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field The present invention relates to an inkjet image forming apparatus.[0002]2. Background Arts[0003]In a line-type inkjet image forming apparatus, plural ink heads are aligned along a direction perpendicular to a feed direction of print sheets, and printing is done by injecting ink droplets from the ink heads onto a print sheet that is being fed. The ink heads in such an inkjet image forming apparatus have different injection properties, so that a density difference may occur with respect to neighboring ink heads due to the different injection properties. If a density difference occurs with respect to neighboring ink heads, the density difference may be recognizable easily. Therefore, it is required to reduce such a density difference.[0004]In a prior-art inkjet image forming apparatus, there is proposed is a method adjusting density by (1) printing a print sheet with a print pattern by which a density difference is easily recognizabl...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41J2/21
CPCB41J2/2132B41J2/2056H04N1/4057H04N1/407
Inventor BANSYO, TOSHIHIRO
Owner RISO KAGAKU CORP
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