# US 2014/0192369 A1 · Automatic printing adjustment method for page-width array printing device

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- Number: US 2014/0192369 A1
- Document ID: US20140192369A1
- Status: Published application
- Kind: A1
- Application number: 14/141,905
- Filed: 2013-12-27
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Microjet Technology Co., Ltd.
- Applicants: Microjet Technology Co., Ltd
- Inventors: Kwo-Yuan Shi; Ching-Sung Lin; Wei-Lun Ma; Hsueh-Kuan Shih
- Web page: https://patentgrep.com/patent/US20140192369A1

## CPC

- G06K 15/027: {Test patterns and calibration (arrangements for controlling or analysing printing mechanisms of typewriters or selective printing units B41J29/393 takes precedence; colour correction using test pattern analysis in general H04N1/6033)}
- G06K 15/102: {using ink jet print heads}
- G06K 15/1868: {for fitting to an output condition, e.g. paper colour or format}
- H04N 1/00015: {Reproducing apparatus}
- H04N 1/00031: {Testing, i.e. determining the result of a trial (H04N1/00029 takes precedence; using test signals for transmission mode changing H04N2201/33371)}
- H04N 1/00045: {using a reference pattern designed for the purpose, e.g. a test chart}
- H04N 1/00053: {out of service, i.e. outside of normal operation}
- H04N 1/00063: {using at least a part of the apparatus itself, e.g. self-testing}
- H04N 1/00082: {Adjusting or controlling (interrupting an operation H04N1/00915; inhibiting an operation H04N1/00925)}
- H04N 1/047: Detection, control or error compensation of scanning velocity or position ({H04N1/0402 and } H04N1/17 take precedence)
- H04N 1/6044: {involving a sensor integrated in the machine or otherwise specifically adapted to read the test pattern}
- H04N 1/12: using the sheet-feed movement {or the medium-advance or the drum-rotation movement} as the slow scanning component, {e.g. arrangements for the main-scanning}({sheet-feed movement by translatory movement of a flat picture-bearing surface H04N1/1008; main-scanning using oscillating or rotating mirrors H04N1/113; } using multi-element arrays H04N1/19)
- H04N 1/1911: {Simultaneously or substantially simultaneously scanning picture elements on more than one main scanning line, e.g. scanning in swaths}
- H04N 1/1918: {Combination of arrays}
- H04N 2201/04717: on the scanned sheet, e.g. a reference sheet
- H04N 2201/04767: by controlling the timing of the signals, e.g. by controlling the frequency o phase of the pixel clock
- H04N 2201/04794: Varying the control or compensation during the scan, e.g. using continuous feedback or from line to line
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An automatic printing adjustment method for a page-width array printing device is provided. The page-width array printing device includes a printing module, a scanning module and a print region. Firstly, the printing module prints a print medium placed on the print region to obtain a printed image, and the scanning module scans the printed image of the print medium. Then, the printed image is transmitted from the scanning module to a processor. Then, a noise eliminating operation, a tilt calibration operation, a ROI selecting operation, a horizontal detection operation and a vertical detection operation are performed on the printed image. Afterwards, a calibrating result is feedback from the processor to the printing module. The printing conditions of nozzles of the respective inkjet head structures are adjusted according to the calibrating result.

## Claims

### Claim 1

An automatic printing adjustment method for a page-width array printing device, the page-width array printing device comprising a printing module, a scanning module and a print region, the printing module comprising a plurality of inkjet head structures, each inkjet head structure comprising a plurality of nozzles, the automatic printing adjustment method comprising steps of:
(a) allowing the printing module to print a print medium placed on the print region to obtain a printed image and allowing the scanning module to scan the printed image of the print medium;
(b) transmitting the printed image from the scanning module to a processor;
(c) performing a noise eliminating operation, a tilt calibration operation, a ROI (region of interest) selecting operation, a horizontal detection operation and a vertical detection operation on the printed image by the processor; and
(d) feedback a calibrating result from the processor to the printing module, so that printing conditions of the nozzles of the respective inkjet head structure are adjusted according to the calibrating result.

### Claim 2 (depends on 1)

The automatic printing adjustment method according to claim 1, wherein the printing module and the scanning module are arranged in parallel and relative movement of the print region.

### Claim 3 (depends on 1)

The automatic printing adjustment method according to claim 1, wherein after the noise eliminating operation in the step (c) is performed, a noise contained in the printed image of the print medium is eliminated.

### Claim 4 (depends on 1)

The automatic printing adjustment method according to claim 1, wherein after the tilt calibration operation in the step (c) is performed, a tilt angle of the printed image of the print medium is corrected.

### Claim 5 (depends on 1)

The automatic printing adjustment method according to claim 1, wherein after the ROI selecting operation in the step (c) is performed, a plurality of overlap regions of the printed image corresponding to the inkjet head structures are individually determined.

### Claim 6 (depends on 5)

The automatic printing adjustment method according to claim 5, wherein after the horizontal detection operation in the step (c) is performed, horizontal arrangements of the inkjet head structures are realized, and horizontal position errors of the inkjet head structures are fed back to the processor, wherein printing time differences between adjacent nozzles of the inkjet head structures are adjusted according to the horizontal position errors, so that the nozzles of the inkjet head structures along a horizontal direction are not used for double printing.

### Claim 7 (depends on 5)

The automatic printing adjustment method according to claim 5, wherein after the vertical detection operation in the step (c) is performed, vertical arrangements of the inkjet head structures are realized, and vertical position errors of the inkjet head structures are fed back to the processor, wherein printing time differences between adjacent nozzles of the inkjet head structures are adjusted according to the vertical position errors, so that the nozzles of the inkjet head structures along a vertical direction are not used for double printing.

### Claim 8 (depends on 1)

The automatic printing adjustment method according to claim 1, wherein the scanning module is a contact image sensor, a charge coupled device or a camera.