CN100427309C - Ink-jet head calibration method - Google Patents
Ink-jet head calibration method Download PDFInfo
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- CN100427309C CN100427309C CNB2004101013081A CN200410101308A CN100427309C CN 100427309 C CN100427309 C CN 100427309C CN B2004101013081 A CNB2004101013081 A CN B2004101013081A CN 200410101308 A CN200410101308 A CN 200410101308A CN 100427309 C CN100427309 C CN 100427309C
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Abstract
The present invention discloses a method for calibrating an ink-jet head, which uses a way of jet printing a set of specially designed test patterns which comprises a plurality of first bar-shaped pattern groups printed successively and superposed mutually and a plurality of second patterns to orderly detect the superposing states of the first pattern groups and the second patterns to extract one of superposing states so as to find out an optimal calibration condition so that the aim of calibrating the ink jet head can be obtained, and the printing quality is improved.
Description
Technical field
The present invention relates to a kind of method of ink-jet head calibration, particularly relate to a kind ofly by test pattern is obtained overlap condition, and obtain the method for ink-jet head calibration of the ink-jet printer of best alignment condition.
Background technology
Ink-jet printer with printing function can be used for print image and file, if print image data, as long as after suitable image and halftone process, move back and forth in the media by ink gun again, and desire to spray the position of ink droplet in the media, the spray orifice that drives ink gun sprays ink droplet to be located to this, just finishes the printing of image.Generally speaking, ink gun is formed by many spray orifices that are arranged in parallel, and shown in Figure 1A～Fig. 1 D, represents black, cyan, fuchsin and yellow ink gun respectively.In order to reach the printing of phase tablet quality (Photographic quality), when back and forth printing, must do the alignment correction of ink gun earlier, nozzle 11 aligning during bi-directional printing back and forth for example, or nozzle 11 and 13 aiming at same Print direction to guarantee that the position that ink droplet is beaten is on correct position.Usually ink droplet jet is by the position decoder, for example the signal of optics chi generation is used as the synchronizing signal of spraying ink droplet, when ink gun goes and returns when arriving same position in theory, ink droplet will be beaten at same position, but, because ink gun has a transverse movement speed, can horizontal flight a period of time just arrive paper when leaving nozzle after making ink pull the trigger, for same optics chi signal, above-mentioned ink droplet flies will cause with the phenomenon that flies the skew of ink droplet print position left to the right, in addition, some printer goes to return the phenomenon that the print-out rate difference strengthens skew especially, will not reduce print quality if do to proofread and correct.
In order to address the above problem, US Pat.No.5289208 provides a kind of ink-jet head calibration method, shown in Fig. 2 A, the ink gun that at first utilizes first kind of color of printer along the vertical line segment 10 that prints specific interval by left-to-right direction with as with reference to line, organize vertical line segment 12 with the ink gun of second kind of color along print another by left-to-right direction again, this organizes vertical line segment 12 and has particular offset and be close to above-mentioned first group of vertical line segment 10, with the correction as unidirectional not homochromy ink gun; Or shown in Fig. 2 B, make bidirectional correcting at same ink gun, at first along the vertical line segment 14 that prints specific interval by left-to-right direction, again along the vertical line segment 16 that prints different side-play amounts by the right side to the direction on a left side.Utilize optical scanner to scan above-mentioned vertical line segment 10 and 12,14 and 16 at last, to judge best alignment condition.This method must scan Lower Half with the optical scanner scanning first half earlier, determines respectively to go up the vertical line segment of Lower Half position, determines best alignment condition at last again, and it is slower to seem on the speed.
In addition, as shown in Figure 3, the used mode of US Pat.No.6390587 is to print one group of test pattern 20 in the media, this test pattern 20 comprises the stick (Bar) 24 that the ink gun of stick (Bar) 22 that the ink gun of first kind of color prints and second kind of color is printed, and above-mentioned two groups of sticks 22,24 are positioned at sustained height and repeated arrangement interlaced with each other, basically this two groups of sticks 22,24 formed cyclical signals should differ 180 ° on phase place, detect the reflectivity of test pattern 20 at last by optical scanner, to obtain above-mentioned two groups of sticks 22,24 phase difference, according to this phase difference in order to revise the side-play amount of double-colored unidirectional printing, can obtain best alignment condition, same method also is used for homochromy bidirectional correcting.This method must calculate the position of each stick that first kind ink gun prints, and calculates the position of each stick that the ink gun of second kind of color prints again, calculates the phase difference of the two at last again, and computing time is long and process is complicated.
Summary of the invention
In view of above problem, the invention provides a kind of method of ink-jet head calibration, be to use the test pattern of one group of particular design, again by this group test pattern is detected its overlap condition, to obtain best alignment condition, and can reach purpose from its aligning in dynamic(al) correction ink gun season, in order to solve the existing in prior technology problem substantially.
Therefore, for reaching above-mentioned purpose, the method of ink-jet head calibration provided by the present invention, comprise the following step: at first, use ink-jet printer to go several first strip pattern groups of spray printing, and each first strip pattern group is made of several parallel equally spaced first strip patterns, then, several second patterns of spray printing, and each second pattern is distinguished overlapped with each first strip pattern group, detect the overlap condition of the first strip pattern group and second pattern more in regular turn, at last, analyze the information of each overlap condition, and extract one of them overlap condition, and find out best alignment condition, with the calibrating inkjet head.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Figure 1A～Fig. 1 D is respectively prior art black, cyan, fuchsin and yellow ink gun;
Fig. 2 A and Fig. 2 B are the not schematic diagram of the test pattern of unidirectional correction with the bidirectional correcting of ink gun of the same colour time of homochromy ink gun of prior art;
Fig. 3 is the schematic diagram of the test pattern of another prior art ink-jet head calibration method;
Fig. 4 is the flow chart of ink-jet head calibration method of the present invention;
The schematic diagram of the test pattern when Fig. 5 A～Fig. 5 D is the bidirectional correcting of use monochrome ink gun of first embodiment of the invention;
The use optical scanner that Fig. 6 A～Fig. 6 D is respectively first embodiment of the invention reads the curve map of average reflectance of the test pattern of Fig. 5 A～Fig. 5 D;
Fig. 7 A～Fig. 7 D is the schematic diagram of test pattern of unidirectional timing of the double-colored ink gun of use of second embodiment of the invention;
Fig. 8 is the schematic diagram of the test pattern of third embodiment of the invention;
Fig. 9 is the schematic diagram of the test pattern of fourth embodiment of the invention;
Figure 10 is a kind of schematic diagram of judging the test pattern that is difficult for that easily causes;
The theoretical changing value of Figure 11 A～Figure 11 J reflected signal during for the scanned test pattern of usability optical assembly of the present invention;
Figure 12 is that the present invention is according to Figure 11 A～measured intensity curves figure of Figure 11 J;
Figure 13 A～Figure 13 J is the present invention's theoretical changing value of reflected signal during the scanned test pattern of usability optical assembly under best alignment condition; And
Figure 14 for the present invention according to Figure 13 A～measured intensity curves figure of Figure 13 J, and make comparisons with the slope of curve of Figure 12.
Wherein, Reference numeral:
10,12,14,16 vertical line segments
11,13 nozzles
20 test patterns
22,24 sticks
30,50,80,90 first strip pattern groups
32,52,70 first strip patterns
40,60,82,92 second patterns
42,62,72,94 second strip patterns
99 photosensory assemblies
S, S1, Smax slope δ S slope differences distance
The specific embodiment
Figure 4 shows that the flow chart of the method for ink-jet head calibration provided by the present invention, its main flow process comprises the following step: step 100, at first, several first strip pattern groups of spray printing; Step 200, each first strip pattern group includes several parallel equally spaced first strip patterns; Then, several second patterns of spray printing; Step 300, each second pattern and each first strip pattern group are overlapped respectively; Detect the overlap condition of the first strip pattern group and second pattern more in regular turn; Step 400, last, extract one of them overlap condition, and the calibrating inkjet head.
Below further implementation step of the present invention is elaborated by several embodiment.In the embodiments of the invention, be to use a ink-jet printer with printing function, when printer detect new ink gun loaded onto or received the user under correction instruction the time, printer is the printing test pattern voluntarily.
The schematic diagram of the test pattern that Fig. 5 A～Fig. 5 D is depicted as the first embodiment of the present invention when using the bidirectional correcting of monochrome ink gun, comprising the steps: step 100, is to utilize monochrome ink gun earlier along going out the first strip pattern group of being made up of several first strip patterns 32 30 by the right side to left direction spray printing; Step 200 is again along second pattern of being made up of several second strip patterns 42 left-to-right direction spray printing 40; Step 300, each the first strip pattern 32 and the second strip pattern 42 all present tool horizontal line at regular intervals in vertical direction, and the above-mentioned first strip pattern 32 and the second strip pattern 42 arrangement that intermeshes, then, read in Fig. 5 A～Fig. 5 D the average reflectance of each test pattern that is constituted by the first strip pattern group 30 and second pattern 40 with optical scanner, shown in Fig. 6 A～Fig. 6 D, judge the overlap condition of the first strip pattern group 30 and second pattern 40; Step 400, reach maximum Smax if be used to describe the slope S of positive edge of the intensity curves of average reflectance, shown in Fig. 6 B, the plyability of (paper feed direction) is best in vertical direction promptly to represent the first strip pattern group 30 and second pattern 40, just shown in Fig. 6 B, and under this default side-play amount condition, the best alignment condition of ink gun is arranged, adopt this group offset parameter to guarantee that the optimal printing quality is arranged.
Fig. 7 A～Fig. 7 D is depicted as the schematic diagram of test pattern that the second embodiment of the present invention is used the unidirectional timing of double-colored ink gun, comprise step: step 100, do not exist together with first embodiment, be that present embodiment is to utilize the ink gun of first kind of color along going out the first strip pattern group of being made up of several first strip patterns 52 50 by the right side to left direction spray printing earlier; Step 200, second pattern 60 that utilizes the ink gun of second kind of color to be formed by several second strip patterns 62 again with equidirectional spray printing; Step 300 also reads in Fig. 7 A～Fig. 7 D the average reflectance of each test pattern that is made of the first strip pattern group 50 and second pattern 60 subsequently with optical scanner, and judges the overlap condition of the first strip pattern group 50 and second pattern 60; Step 400, when the slope of the positive edge of the intensity curves that is used to describe average reflectance reaches maximum, the plyability of (paper feed direction) is best in vertical direction promptly to represent the first strip pattern group 50 and second pattern 60, shown in Fig. 7 B, and extract this group offset parameter, just can obtain the best alignment condition of ink gun, to possess the optimal printing quality.
The method of the ink-jet head calibration of the foregoing description, first strip pattern of its first strip pattern and the second strip pattern of second pattern are example with the same widths; In fact the first strip pattern can be different with the width of the second strip pattern, and as shown in Figure 8, in the test pattern of the third embodiment of the present invention, the width of its second strip pattern 72 is wide than the first strip pattern 70.
Perhaps, be illustrated in figure 9 as the schematic diagram of the test pattern of the fourth embodiment of the present invention, its second pattern 82 is a blocky, and overlap with the first strip pattern group 80, can avoid situation as shown in figure 10, the second strip pattern 94 that shows the first strip pattern group 90 be horizontal line and second pattern 92 among the figure is overlapping in the horizontal direction, when the average reflectance that utilizes the read test pattern is judged the overlap condition of the first strip pattern group 90 and second pattern 92, resulting reflected signal can can't have evident difference, and causes judgement to be difficult for.
What will replenish in addition is, the theoretical changing value of reflected signal when being depicted as usability optical assembly 99 scanned test patterns of the present invention as Figure 11 A～Figure 11 J; When photosensory assembly 99 passes through test pattern, photosensory assembly 99 can detect the reflected signal of test pattern, and the many groups of acquisition reflected signal groups, suppose in the unit interval build-in test pattern unit distance of advancing, it is pixel (pixel) value of fixed number herein, and the signal strength signal intensity that photosensory assembly measures is directly proportional with intensity of reflected light, then every group of reflected signal group sensing of photosensory assembly 99 can utilize corresponding grid point to count, in Figure 11 A～Figure 11 J, its corresponding grid point number is respectively 6,20,38,56,67,63,50,31,13,3, then can make the signal strength signal intensity intensity curves figure relevant, as shown in figure 12 with the test pattern position.Analyzing this slope of a curve S1 can learn must find a slope maximum Smax under best alignment condition, shown in Figure 13 A～Figure 13 J, the theoretical changing value of reflected signal when being under best alignment condition usability optical assembly 99 scanned test patterns, and Figure 14 shows that the intensity curves figure that its signal strength signal intensity is relevant with the test pattern position, and show that its slope S max and aforementioned slope S 1 slope differences in comparison are apart from δ S; Utilize this principle, can find out the best alignment parameter of ink gun.When the measurement of reality was the reflected signal of measurement paper background, this reflected signal waveform can still still be represented best alignment condition with the most precipitous part conversely.
In sum, the method of ink-jet head calibration provided by the present invention is by special test pattern design, can be directly used in print result calculates, computational process is very simple and easy and rapid, especially can utilize test, and analyze the positive edge slope of reflected signal, find out slope the maximum and can obtain best alignment condition for the reflected signal of test pattern, reach the purpose of ink-jet head calibration, thereby improve print quality.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (9)
1, a kind of method of ink-jet head calibration is characterized in that, comprises following steps:
The a plurality of first strip pattern groups of spray printing, each this first strip pattern group includes a plurality of parallel equally spaced first strip patterns;
A plurality of second patterns of spray printing, each this second pattern and each this first strip pattern group are overlapped respectively;
Described first a strip pattern group and described second pattern are formed a test pattern, optical scanner reads the average reflectance of each test pattern respectively, to obtain the overlap condition of first strip pattern group described in each test pattern and described second pattern, the described average reflectance of each described test pattern partners should be in the intensity curves of described overlap condition; And
Extract the offset parameter of the pairing overlap condition correspondence of intensity curves of positive edge slope maximum, and calibrate this ink gun according to this offset parameter.
2, the method for ink-jet head calibration according to claim 1 is characterized in that, this first strip pattern group and this second pattern are formed with reverse spray printing by same ink gun.
3, the method for ink-jet head calibration according to claim 1 is characterized in that, this first strip pattern group and this second pattern by different ink guns in regular turn spray printing formed.
4, the method for ink-jet head calibration according to claim 1 is characterized in that, respectively this second pattern includes a plurality of parallel equally spaced second strip patterns, and crisscrosses between this first strip pattern.
5, the method for ink-jet head calibration according to claim 4 is characterized in that, this second strip pattern has identical spacing with this first strip pattern.
6, the method for ink-jet head calibration according to claim 5 is characterized in that, respectively this first strip pattern has same widths with this second strip pattern respectively.
7, the method for ink-jet head calibration according to claim 1 is characterized in that, respectively this second pattern is a block pattern, overlaps with this first strip pattern group respectively.
8, the method for ink-jet head calibration according to claim 1, it is characterized in that, this optical scanner reads the average reflectance of a plurality of test patterns of being made up of described first strip pattern group and described second pattern, with the step of the overlap condition that obtains described first strip pattern group and described second pattern, by detecting respectively this first strip pattern group obtain this average reflectance with the reflected signal of this second pattern respectively.
9, the method for ink-jet head calibration according to claim 8, it is characterized in that, this detects respectively this first strip pattern group and the respectively step of the reflected signal of this second pattern, include the following step: detect respectively this first strip pattern group and respectively this second pattern in regular turn, and obtain a plurality of reflected signal groups; Form many bars intensity curve corresponding to this overlap condition respectively according to this reflected signal group respectively; Reach and calculate the respectively slope of this intensity curves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101013081A CN100427309C (en) | 2004-12-16 | 2004-12-16 | Ink-jet head calibration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004101013081A CN100427309C (en) | 2004-12-16 | 2004-12-16 | Ink-jet head calibration method |
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| CN1788998A CN1788998A (en) | 2006-06-21 |
| CN100427309C true CN100427309C (en) | 2008-10-22 |
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| TWI655108B (en) * | 2014-09-03 | 2019-04-01 | 三緯國際立體列印科技股份有限公司 | Three-dimensional printing apparatus and method for compensating coordinate offset of nozzle thereof |
| JP6646249B2 (en) * | 2015-09-11 | 2020-02-14 | セイコーエプソン株式会社 | Liquid ejection device and transport amount adjustment method |
| US11072170B2 (en) | 2018-09-27 | 2021-07-27 | Ricoh Company, Ltd. | Liquid discharge apparatus, liquid discharge method, and recording medium |
| CN114290825B (en) * | 2021-12-28 | 2023-06-20 | 宁波得力科贝技术有限公司 | Position calibration method of printing head and ink-jet printer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289208A (en) * | 1991-10-31 | 1994-02-22 | Hewlett-Packard Company | Automatic print cartridge alignment sensor system |
| US6076915A (en) * | 1998-08-03 | 2000-06-20 | Hewlett-Packard Company | Inkjet printhead calibration |
| US6109722A (en) * | 1997-11-17 | 2000-08-29 | Hewlett-Packard Company | Ink jet printing system with pen alignment and method |
| US20020030709A1 (en) * | 1998-04-03 | 2002-03-14 | Osamu Iwasaki | Printing apparatus and head driving method |
| US6390587B1 (en) * | 1998-03-04 | 2002-05-21 | Hewlett-Packard Company | Calibration system and method scanning repeated subsets of print test patterns having common color reference markings |
| JP2004181699A (en) * | 2002-12-02 | 2004-07-02 | Canon Inc | Method for calibrating reading position of sensor in image recorder/reader |
| CN1521002A (en) * | 2003-02-14 | 2004-08-18 | 三星电子株式会社 | Method of calibrating print alignment error |
-
2004
- 2004-12-16 CN CNB2004101013081A patent/CN100427309C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289208A (en) * | 1991-10-31 | 1994-02-22 | Hewlett-Packard Company | Automatic print cartridge alignment sensor system |
| US6109722A (en) * | 1997-11-17 | 2000-08-29 | Hewlett-Packard Company | Ink jet printing system with pen alignment and method |
| US6390587B1 (en) * | 1998-03-04 | 2002-05-21 | Hewlett-Packard Company | Calibration system and method scanning repeated subsets of print test patterns having common color reference markings |
| US20020030709A1 (en) * | 1998-04-03 | 2002-03-14 | Osamu Iwasaki | Printing apparatus and head driving method |
| US6076915A (en) * | 1998-08-03 | 2000-06-20 | Hewlett-Packard Company | Inkjet printhead calibration |
| JP2004181699A (en) * | 2002-12-02 | 2004-07-02 | Canon Inc | Method for calibrating reading position of sensor in image recorder/reader |
| CN1521002A (en) * | 2003-02-14 | 2004-08-18 | 三星电子株式会社 | Method of calibrating print alignment error |
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