An inkjet printer prints predetermined information comprising dots formed by the ejected ink onto the print target. Images are captured of the predetermined information printed. The printing area of the predetermined information is detected from the image and a criteria position grid in which each of the predetermined divided dot areas is assigned with a dot as a criteria for inspecting the landing position is generated. The dot landing position is inspected relative to the criteria dot position based on a superimposed image of the printing area and the criteria position grid and a degree of displacement of the dot landing position relative to the criteria dot position is determined. A feedback signal for correcting the dot landing position is generated based on the result of the inspection and ink is ejected on the print target based on the corrected dot landing position obtained from the feedback signal.

Regarding an image forming apparatus for printing an input image and including a print head having a head sensor configured to sense information from the input image printed on a print medium, there is a method of determining a head sensor position parameter in the image forming apparatus. The method includes printing a first swath of the input image on the print medium and determining the head sensor position parameter by performing a sub-method. The sub-method includes capturing, via the head sensor, a target image from the printed first swath, comparing the target image to a reference image for the first swath based upon the input image, and determining the head sensor position parameter based on a relative shift between the target image and the reference image.

Regarding an image forming apparatus for printing an input image and including a print head having a head sensor configured to sense information from the input image printed on a print medium, there is a method of determining a head sensor position parameter in the image forming apparatus. The method includes printing a first swath of the input image on the print medium and determining the head sensor position parameter by performing a sub-method. The sub-method includes capturing, via the head sensor, a target image from the printed first swath, comparing the target image to a reference image for the first swath based upon the input image, and determining the head sensor position parameter based on a relative shift between the target image and the reference image.

Disclosed is a method of determining line feed error in an image forming apparatus for printing an image, said image forming apparatus comprising a print head having a head sensor configured to sense information from the image printed on a print medium, said method comprising the steps of printing a first swath of the image on the print medium, repositioning the print head relative to the print medium by at least one line feed distance, determining a line feed error based upon information sensed from the printed first swath by the head sensor, and printing, using the determined line feed error, a second swath of the halftone image on the print medium.

Disclosed is a method of determining line feed error in an image forming apparatus for printing an image, said image forming apparatus comprising a print head having a head sensor configured to sense information from the image printed on a print medium, said method comprising the steps of printing a first swath of the image on the print medium, repositioning the print head relative to the print medium by at least one line feed distance, determining a line feed error based upon information sensed from the printed first swath by the head sensor, and printing, using the determined line feed error, a second swath of the halftone image on the print medium.

The purpose of the present invention is to suppress variance in the print quality of an inkjet recording device. In order to solve the above problem, the present invention is an inkjet recording device of a charge control type equipped with two or more nozzles which are disposed side by side in a print head, the inkjet recording device being characterized by the following: having a control unit for performing print control independently for each of a plurality of printing configurations; the control unit having an input unit whereby current values of print elements of each of the printing configurations can be periodically checked, and having an output unit whereby the print elements during a subsequent print can be modified; and in that the control unit further adjusts each of the nozzles for every print so as to cause the charging voltage, deflecting voltage, and ink pressure of the subsequent print to approach a reference value.

The purpose of the present invention is to suppress variance in the print quality of an inkjet recording device. In order to solve the above problem, the present invention is an inkjet recording device of a charge control type equipped with two or more nozzles which are disposed side by side in a print head, the inkjet recording device being characterized by the following: having a control unit for performing print control independently for each of a plurality of printing configurations; the control unit having an input unit whereby current values of print elements of each of the printing configurations can be periodically checked, and having an output unit whereby the print elements during a subsequent print can be modified; and in that the control unit further adjusts each of the nozzles for every print so as to cause the charging voltage, deflecting voltage, and ink pressure of the subsequent print to approach a reference value.

Light redirected by liquid droplets ejected from nozzles (30) of a plurality of columns (26, 226, 227) of nozzles (30) is sensed to detect a vertical trajectory of the liquid droplets for each of the nozzles (30).

Light redirected by liquid droplets ejected from nozzles (30) of a plurality of columns (26, 226, 227) of nozzles (30) is sensed to detect a vertical trajectory of the liquid droplets for each of the nozzles (30).

A method for forming at least one plurality of printed dots on a surface, with help of at least one plurality of drops generated by a printhead of a continuous inkjet printer. The method comprises, for each plurality of printed dots: deciding, whether all drops of the at least one plurality of drops are protected from perturbations due to the air resistance or whether at least one drop of the at least one plurality of drops is not protected from the perturbations; generating and charging each drop of the at least one plurality of drops according to whether it is protected from the perturbations or not protected from the perturbations; and printing the at least one plurality of drops on the surface.