CN101391533A - Liquid ejecting apparatus and raster line forming method - Google Patents

Liquid ejecting apparatus and raster line forming method Download PDF

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Publication number
CN101391533A
CN101391533A CNA2008101496719A CN200810149671A CN101391533A CN 101391533 A CN101391533 A CN 101391533A CN A2008101496719 A CNA2008101496719 A CN A2008101496719A CN 200810149671 A CN200810149671 A CN 200810149671A CN 101391533 A CN101391533 A CN 101391533A
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China
Prior art keywords
head unit
nozzle
liquid
width
scan line
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CNA2008101496719A
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Chinese (zh)
Inventor
吉田昌彦
吉田刚
德永道昭
中野龙也
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Seiko Epson Corp
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Seiko Epson Corp
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Publication of CN101391533A publication Critical patent/CN101391533A/en
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Abstract

A liquid ejecting apparatus and a method for forming a scanning line. The liquid ejecting apparatus is provided with a head unit that that has a plurality of heads along a first direction, in which a plurality of nozzles that eject a liquid onto a medium are lined up in the first direction, and that ejects the liquid while moving relative to the medium in a second direction, which intersects the first direction, the head unit having a width in the first direction that is greater than a width of the medium in the first direction; a movement mechanism that makes the head unit move relative to the medium a plurality of times alternately in the second direction and the first direction; and a control section that forms a raster line group by forming each raster line by making two or more different nozzles that are different eject the liquid, respectively while making the movement mechanism move the head unit relative to the medium a plurality of times alternately in the second direction and the first direction, makes the movement mechanism move the head unit relatively so that a total amount of movement of the head unit in the first direction when the head unit has moved relatively the plurality of times is less than an effective nozzle width of one of the heads in the first direction, and forms the raster line group so that a number of the raster lines formed by making the nozzles of only one of the heads eject the liquid is not greater than a number of the raster lines formed by making the nozzles of two or more of the heads eject the liquid. Thus, an increase in the width in the first direction of the head unit is controlled and deterioration in image quality is curbed as well.

Description

Liquid ejection apparatus and scanning line forming method
Technical field
The present invention relates to liquid ejection apparatus and scan line (raster line) formation method.
Background technology
A kind of as liquid ejection apparatus sprays the ink-jet printer that liquid (ink) prints on known oriented paper or the various media such as cloth, film.This printer possesses head (head) that go up to arrange a plurality of nozzles of guided media ejection liquid at first direction (sub scanning direction), this first limit in the second direction (main scanning direction) of intersecting with first direction Yi Bian go up the mobile liquid that sprays.
From the viewpoint of high image qualityization, above-mentioned printer carries out for example so-called overlapping (overlap) and prints.That is, printer alternately repeatedly moves head on second direction and first direction, make different two with top nozzle ejection liquid, form a scan line.
Patent documentation 1: the international openly text that discloses No. 01/03930
Yet in printer, the viewpoint from the high speed printed possesses the head unit that has a plurality of above-mentioned heads along first direction.In this case, for example in order to make liquid once be ejected into all zones of medium width, the width of first direction of having considered to make head unit is greater than the scheme of the width of the first direction of medium.Yet, in such formation, when the head unit when printing when total amount of movement of first direction is big, once be ejected into all zones of medium width in order when second direction moves, to make liquid, need to increase the width of the first direction of head unit.
In addition, known because the individual difference of head can make the ejection characteristic difference of liquid.For example, a stature has the characteristic that is easy to spray liquid, and another stature has the characteristic that is difficult to spray liquid.Therefore, under the situation of a plurality of ejection liquid that constitute head unit, the difference of ejection characteristic that can produce because of each causes so-called density unevenness etc., and there is the possibility of image quality deterioration in the result.
Summary of the invention
The present invention proposes in view of this problem, and its purpose is that the width that suppresses the first direction of head unit becomes big, and, suppress the image quality deterioration.
In order to solve above-mentioned problem, the invention provides a kind of liquid ejection apparatus, it is characterized in that possessing:
(a) head unit, it has a plurality of heads that are arranged with a plurality of nozzles to medium ejection liquid on above-mentioned first direction along first direction, and relatively moving with the relative above-mentioned medium of second direction that above-mentioned first direction intersects, and spraying aforesaid liquid,
The width of the above-mentioned first direction of above-mentioned head unit is greater than the width of the above-mentioned first direction of above-mentioned medium;
(b) travel mechanism, it makes above-mentioned head unit with respect to above-mentioned medium, alternately repeatedly relatively moves on above-mentioned second direction and above-mentioned first direction; With
(c) control part, it makes above-mentioned head unit with respect to above-mentioned medium by utilizing above-mentioned travel mechanism, on above-mentioned second direction and above-mentioned first direction, alternately repeatedly relatively move, and make said nozzles different more than two spray aforesaid liquid respectively and form each scan line, form scanline groups
Carry out total amount of movement of the above-mentioned first direction of above-mentioned above-mentioned head unit when repeatedly relatively moving according to above-mentioned head unit, the mode less than effective nozzle width of the above-mentioned first direction of an above-mentioned head relatively moves above-mentioned head unit by above-mentioned travel mechanism,
According in the above-mentioned scanline groups, only make the said nozzle ejection aforesaid liquid of an above-mentioned head and the quantity of the above-mentioned scan line that forms, mode below the quantity of the above-mentioned scan line that forms for the said nozzle ejection aforesaid liquid that makes plural above-mentioned head forms above-mentioned scanline groups.
For further feature of the present invention, will set forth by the record of this specification and accompanying drawing.
Description of drawings
Fig. 1 is that the integral body of printer 1 constitutes block diagram.
Fig. 2 A is the simple cutaway view of printer 1, and Fig. 2 B is the simple vertical view of printer 1.
Fig. 3 represents the following nozzle arrangement of head unit 40.
Fig. 4 A~Fig. 4 I is the schematic diagram that is used to illustrate the mobile status of the head unit 40 when printing.
Fig. 5 A is the figure that is used to illustrate because of the different density unevenness that cause of each ejection characteristic of 41 with Fig. 5 B.
Fig. 6 A represents to increase the head unit 40 under the situation of total subscan amount.Fig. 6 B represents to reduce the head unit 40 under the situation of total subscan amount.
Fig. 7 is the flow chart that is used to illustrate this print processing.
Fig. 8 is the figure of the overstriking that is used to illustrate that present embodiment relates to.
Fig. 9 is the figure of the overstriking that is used to illustrate that present embodiment relates to.
Figure 10 represents the head unit 40 that second embodiment relates to.
Figure 11 is the figure of the overstriking that is used to illustrate that second embodiment relates to.
Figure 12 is the figure of the overstriking that is used to illustrate that the 3rd embodiment relates to.
Symbol description among the figure: 1... printer; 10... controller; 11... interface; 12...CPU; 13... memory; 14... unit controls circuit; 20... conveyance unit; 21... transfer roller; 22... outlet roller; 23... absorptive table; 30... driver element; 40... head unit; 41... head; 50... detector set; 90... computer.
The specific embodiment
By the record of this specification and accompanying drawing, clear and definite at least following content.
A kind of liquid ejection apparatus is characterized in that, possesses:
(a) head unit, it has a plurality of heads that are arranged with a plurality of nozzles to medium ejection liquid on above-mentioned first direction along first direction, and relatively moving with the relative above-mentioned medium of second direction that above-mentioned first direction intersects, and spraying aforesaid liquid,
The width of the above-mentioned first direction of above-mentioned head unit is greater than the width of the above-mentioned first direction of above-mentioned medium;
(b) travel mechanism, it makes above-mentioned head unit with respect to above-mentioned medium, alternately repeatedly relatively moves on above-mentioned second direction and above-mentioned first direction; With
(c) control part, it makes above-mentioned head unit with respect to above-mentioned medium by utilizing above-mentioned travel mechanism, on above-mentioned second direction and above-mentioned first direction, alternately repeatedly relatively move, and make said nozzles different more than two spray aforesaid liquid respectively and form each scan line, form scanline groups
Carry out total amount of movement of the above-mentioned first direction of above-mentioned above-mentioned head unit when repeatedly relatively moving according to above-mentioned head unit, the mode less than effective nozzle width of the above-mentioned first direction of an above-mentioned head relatively moves above-mentioned head unit by above-mentioned travel mechanism,
According in the above-mentioned scanline groups, only make the said nozzle ejection aforesaid liquid of an above-mentioned head and the quantity of the above-mentioned scan line that forms, mode below the quantity of the above-mentioned scan line that forms for the said nozzle ejection aforesaid liquid that makes plural above-mentioned head forms above-mentioned scanline groups.
According to such liquid ejection apparatus, the width that can suppress the first direction of head unit becomes big, and, can suppress the deterioration of image quality.
And, preferably in this liquid ejection apparatus,
When the mobile number of times of the above-mentioned second direction of above-mentioned head unit being carried out above-mentioned above-mentioned head unit when repeatedly relatively moving, when being made as m time,
In above-mentioned m time move, all above-mentioned heads all spray aforesaid liquid.In this case, can reduce total amount of movement of head unit, and form scanline groups with the head of Min. quantity.
And, preferably in this liquid ejection apparatus,
When the mobile number of times of the above-mentioned first direction that above-mentioned head unit is carried out above-mentioned above-mentioned head unit when repeatedly relatively moving, when being made as n time,
Said n time each mobile amount of movement is identical size.The deterioration that can suppress in this case, image quality effectively.
In addition, the invention provides a kind of scanning line forming method,
(a) by head unit is alternately repeatedly relatively moved on second direction and first direction with respect to medium, and different nozzles sprays liquid respectively and forms each scan line more than two, form each scanline groups, wherein, described head unit has a plurality of a plurality of heads that spray the nozzle of liquid to medium that are arranged with along above-mentioned first direction on first direction, relatively moving with the relative above-mentioned medium of second direction that above-mentioned first direction intersects, and ejection aforesaid liquid, the width of the above-mentioned first direction of above-mentioned head unit is greater than the width of the above-mentioned first direction of above-mentioned medium, it is characterized in that
(b) carry out total amount of movement of the above-mentioned first direction of above-mentioned above-mentioned head unit when repeatedly relatively moving according to above-mentioned head unit, the mode less than effective nozzle width of the above-mentioned first direction of an above-mentioned head relatively moves above-mentioned head unit,
According in the above-mentioned scanline groups, only make the said nozzle ejection aforesaid liquid of an above-mentioned head and the quantity of the above-mentioned scan line that forms, mode below the quantity of the above-mentioned scan line that forms for the said nozzle ejection aforesaid liquid that makes plural above-mentioned head forms above-mentioned scanline groups.
According to such scanning line forming method, the width that can suppress the first direction of head unit becomes big, and, can suppress the deterioration of image quality.
The configuration example of==ink-jet printer==
Ink-jet printer (hereinafter referred to as printer 1) as an example of liquid ejection apparatus, the unit image of use will be cut off later on, for example paste to pay the printing thing of the film shape on the preservative film of fresh food, print on the banded type belt T as an example of medium by ink-jetting style.At this, type belt T is the roll web (continuous paper) that has peeling paper, can print as the portrait of printing thing continuously on the continuous direction of this type belt T.
The formation of<printer 1 〉
Fig. 1 is the block diagram of all formations of printer 1.Fig. 2 A is the simple cutaway view of printer 1, and Fig. 2 B is the simple vertical view of printer 1.Fig. 3 represents the following nozzle arrangement of head unit 40.
When printer 1 receives print data, control each unit (conveyance unit 20, driver element 30, head unit 40) by controller 10 as an example of control part, on type belt T, form image.In addition, come situation in the monitor printer 1 by detector set 50, controller 10 is controlled each unit based on its testing result.
Conveyance unit 20 is on the continuous direction of type belt T (hereinafter referred to as the conveyance direction), from upstream side side conveyance downstream type belt T.This conveyance unit 20 has: transfer roller 21, outlet roller 22, absorptive table 23 etc.Drum type belt T before transfer roller 21 will be printed is sent to the absorptive table 23 as print area.Absorptive table 23 carries out vacuum attraction from the below to type belt T, keeps type belt T.Outlet roller 22 is exported the type belt T that printing finishes from print area.Type belt T by from print area output is wound into drum by winding mechanism.
Driver element 30 is to make head unit 40 in main scanning direction corresponding with the conveyance direction and the travel mechanism that moves freely with the corresponding sub scanning direction of the width of type belt T.Driver element 30 for example by make head unit 40 at the X travelling carriage that moves on the main scanning direction, make Y travelling carriage that the X travelling carriage that kept head unit 40 moves on sub scanning direction and the motor that they are moved constitute (not shown).
On main scanning direction, move and the ejection ink by head unit 40, on stamp pad T, form point (dot) row (scan line).Since this point range gather the formation image, therefore come print image by forming point range.Head unit 40 has 10 statures, 41,10 statures 41 and goes up with the meander-like alignment arrangements at width (sub scanning direction).And, to move once to main scanning direction, just can cross over the mode of all zone ejections of the width ink of type belt T by head unit 40, that is,, dispose 10 statures in the width of the sub scanning direction of head unit 40 mode greater than the width of type belt T.
In addition, be formed with below 41 at each: the nozzle rows C of the nozzle rows M of the nozzle rows Y of ejection yellow ink, ejection magenta ink, ejection blue-green ink, the nozzle rows K of ejection black ink.In each nozzle rows, the interval (360dpi) with regulation on width is arranged with 360 nozzles.And, two adjacent on width statures are (at this, with 41 (1) and 41 (2) is that example describes) in 41 (1) two nozzle #359, #360 of forward side of inboard, be positioned at (that is, nozzle is overlapping) on the same line with 41 (2) the most inboard nozzle #1, #2 of forward side.In addition, in the present embodiment, sub scanning direction is equivalent to first direction, and main scanning direction is equivalent to second direction.
The mobile status of the head unit 40 during<printing 〉
Fig. 4 A~Fig. 4 I is the schematic diagram that is used to illustrate the mobile status of the head unit 40 when printing.Printer 1 moves four times on main scanning direction by head unit 40, and forms each point range (scan line).In addition, when printing, type belt T becomes the state that is not maintained at by conveyance on the absorptive table 23.
Head unit 40 before printing is in original position (home position) (position shown in Fig. 4 A) standby.When printing, at first head unit 40 by the driving of driver element 30 on main scanning direction from the downstream side shifting (Fig. 4 B) upstream.And, move in (stroke (pass) 1) at this, cross over all zones of width of type belt T each nozzle ejection ink, thereby on type belt T, form the point range of stroke 1 from head unit 40.Head unit 40 after moving on the main scanning direction, driving by driver element 30 on sub scanning direction from the inboard to side shifting (Fig. 4 C) nearby, afterwards, head unit 40 once more on main scanning direction from upstream side side shifting (stroke 2) (Fig. 4 D) downstream, the all zones of width of crossing over type belt T simultaneously form the point range of stroke 2 from nozzle ejection ink.At this, " stroke " is meant that head unit 40 moves once on main scanning direction, and the numeral of stroke back is carried out the order of stroke.
Like this, head unit 40 alternately is used to form the moving of the sub scanning direction that moves (Fig. 4 B, Fig. 4 D, Fig. 4 F, Fig. 4 H) and head unit 40 (Fig. 4 C, Fig. 4 E, Fig. 4 G) of the main scanning direction of head unit 40 a little.Thus, form a plurality of point ranges (scanline groups) in all zones of the width of type belt T.And, head unit 40 be through with the 4th time main scanning direction move (stroke 4, Fig. 4 H) afterwards, side shifting (Fig. 4 I) inwards on sub scanning direction, thus be positioned at the original position shown in Fig. 4 A.Thus, a succession of of head unit 40 who is through with when printing moves.
The density unevenness that==because of the difference of each ejection characteristic of 41 causes==
It is known because 41 individual difference can make the ejection characteristic difference of ink.For example, the nozzle from certain stature 41 is easy to spray ink sometimes, relatively is difficult to spray ink from other 41 nozzle therewith.Therefore, under the situation that the head unit 40 of 10 statures 41 by having individual difference prints, can produce the so-called density unevenness that the difference because of each ejection characteristic of 41 causes.
At this, in 10 statures 41, with 41 (3), 41 (4), 41 (5) be that example describes.Suppose that 41 (3) have and are difficult to spray the ink characteristic of (spray volume of ink is less than suitable amount), 41 (4) have the characteristic that normally sprays ink (spray volume of ink is suitable), and 41 (5) have the characteristic that is easy to spray ink (spray volume of ink is more than suitable amount).Therefore, suppose when needs form the suitable point (hereinafter referred to as mid point) of spray volume, 41 (3) form the point (hereinafter referred to as point) that spray volumes are less than appropriate amount, and 41 (4) form mid points, and 41 (5) form the point (hereinafter referred to as a little bigger) of spray volumes more than appropriate amount.In addition, establish in 10 statures 41 other most of 41 same with 41 (4), form mid point.
Fig. 5 A is the figure that is used to illustrate because of the different density unevenness that cause of each ejection characteristic of 41 with Fig. 5 B.Point range shown in Fig. 5 A and Fig. 5 B is the point range that two strokes form, and Fig. 5 A is the point range behind the expression stroke 1, and Fig. 5 B is the point range behind the expression stroke 2.
In first point range in five point ranges, stroke 1 and stroke 2 form by 41 (3).Therefore, in first point range, only arranging point.In second point range, stroke 1 forms by 41 (3), and stroke 2 forms by 41 (4).Therefore, in second point range, alternately arranging point and mid point.In row thirdly, stroke 1 and stroke 2 form by 41 (4), thereby are only arranging mid point.In the 4th point range, stroke 1 forms by 41 (4), and stroke 2 forms by 41 (5), thereby is alternately arranging mid point and a little bigger.In the 5th point range, stroke 1 and stroke 2 form by 41 (5), thereby are only arranging a little bigger.
In this case, first point range is only formed by point, therefore compares with the point range that is formed by mid point (point that spray volume is suitable) to seem lighter.That is, can be identified as density unevenness.Equally, the 5th point range is only formed by a little bigger, therefore compares with the point range that is formed by mid point to seem denseer.That is, can be identified as density unevenness.And when the quantity of first point range and the 5th point range increased, density unevenness became significantly, causes image quality further to reduce.
On the other hand, because the 3rd row point range is only formed by mid point, be suitable concentration therefore.In addition, in the second and the 4th point range, because mid point accounts for half, even therefore contain point or a little bigger, concentration also can be neutralized as a whole, thereby is difficult to identify density unevenness.
Like this, form in the formation of point ranges, when point range only, can be produced density unevenness and become significant problem when forming by a stature 41 (above-mentioned 41 (3), 41 (5)) different a plurality of 41 of the ejection characteristic of using ink.
Total subscan amount of the head unit during==print, with the relation of the width of head unit==
In the printer 1 that present embodiment relates to, when mobile (the stroke 1~stroke 4) of four main scanning directions, become the formation of all zone ejection inks of the width of crossing over type belt T.This be because, because the resolution ratio (for example the resolution ratio of sub scanning direction is 720dpi) of image is finer and closely woven apart from ((360dpi)) than nozzle, head unit 40 is moved on sub scanning direction with the unit of 720dpi, can form than the point range of nozzle apart from finer and closely woven interval.
On the other hand, between four strokes of stroke 1~stroke 4, head unit 40 moves three times (Fig. 4 C, Fig. 4 E, Fig. 4 G) on sub scanning direction.And, for all zone ejection inks of the width of in stroke 1~stroke 4, crossing over type belt T, according to the size of these three times mobile total amount of movements (below, be called total subscan amount), the width difference of the sub scanning direction of head unit 40.For this point, describe with Fig. 6 A and Fig. 6 B.
Fig. 6 A has represented to increase the width of the head unit 40 under the situation of total subscan amount.Fig. 6 B has represented to reduce the width of the head unit 40 under the situation of total subscan amount.In addition, the head unit 40 in the left side of representing by the dotted line of Fig. 6 A and Fig. 6 B, be in and be about to begin the state that moves (stroke 1) of main scanning direction for the first time, the head unit 40 on the right side of representing with solid line is in the state that moves (stroke 4) that is about to begin the 4th main scanning direction.Therefore, the side-play amount of the sub scanning direction of the head unit 40 of dotted line and the head unit 40 of solid line becomes total subscan amount of head unit 40.
By Fig. 6 A and Fig. 6 B as can be known, total subscan amount is big more, and then for all zone ejection inks of the width of crossing over type belt T, the width of the sub scanning direction of head unit 40 is also big more.That is, 41 the quantity that constitutes head unit 40 increases.And, when increasing the width of head unit 40,, there is the possibility that causes printer 1 to maximize in order to ensure the space that is provided with of head unit 40.
The print processing that==present embodiment relates to==
In order to suppress above-mentioned problem, to be that density unevenness becomes significantly and the width of the sub scanning direction of the width of head unit 40 increases, printer 1 is carried out following illustrated print processing.
This print processing is characterised in that, total amount of movement of the sub scanning direction of (1) head unit 40 when printing, and the mode less than effective nozzle width (aftermentioned) of the sub scanning direction of a stature 41 makes driver element 30 slip-on head unit 40; (2) quantity of the scan line (point range) that forms according to the nozzle ejection ink that only makes a stature 41 in the scanline groups (a plurality of point range), mode below the quantity of the scan line that forms for the nozzle ejection ink that makes plural 41 forms scanline groups.
The exercises of the printer 1 when carrying out print processing mainly realize by controller 10.Particularly in the present embodiment, handling the program that is stored in memory 13 by CPU12 realizes.And this program is made of the coding that is used to carry out following illustrated exercises.
Fig. 7 is the flow chart that is used to illustrate this print processing.Flow chart shown in Figure 7 is a slave controller 10 by interface 11 from computer 90 (Fig. 1) when having received print data.
In this print processing, at first, controller 10 is transported to print area (step S2) by conveyance unit 20 with type belt T.That is the type belt T before, transfer roller 21 will be printed is transported to the absorptive table 23 as print area.
Then, controller 10 makes head unit 40 move (Fig. 4 B) along main scanning direction under the driving of driver element 30, simultaneously from nozzle ejection ink (step S4).That is, controller 10 is being held in the point range that forms stroke 1 on the type belt T of absorptive table 23.Because image (printing thing) is formed by four strokes, so when forming the point range of stroke 1, controller 10 makes head unit 40 move the subscan amount (Fig. 4 C) (step S6: deny step S8) of regulation at the driving lower edge of control module 30 sub scanning direction.
Then, till forming a processing and finish to point, controller 10 is alternately followed the moving of sub scanning direction (Fig. 4 E, Fig. 4 G) (the step S4~S8) of the formation (Fig. 4 D, Fig. 4 F, Fig. 4 H) of the point range that moves of main scanning direction of head unit 40 and head unit 40.In addition, in the present embodiment, carried out so-called overstriking.
At this, the overstriking that relates to for present embodiment describes.Overstriking is meant, is formed the printing type of a point range (scan line) by plural nozzle.Particularly, a nozzle intermittently forms point range at main scanning direction every several ground.Then, by another nozzle the interrupted point range that has formed is replenished and form point range.
Fig. 8 and Fig. 9 are the figure of the overstriking that is used to illustrate that present embodiment relates to.Wherein, simple for what illustrate, only represent the nozzle rows C in each four nozzle rows (nozzle rows Y, nozzle rows M, nozzle rows C, nozzle rows K) of 41, and each nozzle quantity of 41 is reduced to 16.Therefore, the position of the nozzle rows C of head (41 (1) with 41 (2) etc.) that in Fig. 8, has represented the sub scanning direction inboard in 10 statures 41 in stroke 1~stroke 4 and the state of the formation of point, in Fig. 9, sub scanning direction nearby position in stroke 1~stroke 4 of the nozzle rows C of the head of side (41 (10) with 41 (9) etc.), and the formation state of point have been represented.In addition, in Fig. 8 and Fig. 9, point with the nozzle formation of white circle (zero) expression 41 (1) and 41 (7), point with the nozzle formation of black circle (●) expression 41 (2) and 41 (8), the point that forms with the nozzle of white triangle (△) expression 41 (3) and 41 (9) is with the point of the nozzle formation of black triangle (▲) expression 41 (4) and 41 (10).
In stroke 1~stroke 4, each nozzle by nozzle rows C forms a little on the pixel of print area.At this, " pixel " is meant the position that forms point in order to limit, and the square of imagination on the grid of setting on the type belt T.And in order to determine that pixel describes, the pixel that will arrange on main scanning direction uses " row " to represent with " OK " expression, the pixel that will arrange on sub scanning direction.In addition, Fig. 8 and pixel shown in Figure 9 be at main scanning direction and sub scanning direction, all being spaced with 720dpi.
At first, in stroke 1, from each 41 nozzle ejection ink.Then, in odd-numbered line shown in Figure 8 (1,3,5... capable), the pixel of odd column (1,3,5... row) is formed point range.For example, from the beginning 41 (1) nozzle #1 ejection ink forms a little on the pixel of first odd column of going.Similarly, 41 (1) nozzle #2 ejection ink from the beginning forms a little on the pixel of the odd column of the third line.Like this, each nozzle forms point along the pixel in main scanning direction interval on each row corresponding with position separately.
In addition, the method for the ink ejection of the overlapping nozzles of adjacent two statures on the width (, being that example describes) with 41 (1) and 41 (2) at this, with the method for the ink ejection of nonoverlapping nozzle (for example, 41 (1) nozzle #1) be different.That is, in stroke 1,41 (1) nozzle #15 and nozzle #16 of width inboard form point range 3,7, on the pixel of 11... row, and nearby 41 (2) of side nozzle #1 and nozzle #2, form point range 1,5, on the pixel of 9... row.Like this, the nozzle of two adjacent statures 41 alternately sprays ink, forms point range on the pixel of odd column.
After stroke 1 finishes, the moving of the primary sub scanning direction when printing, head unit 40 is from the interior side direction of the sub scanning direction subscan amount F (particularly being 7/720dpi) of side shifting regulation nearby.
In the stroke 2 after head unit 40 moves, in even number line (8,10,12... capable), the pixel of antithesis ordered series of numbers (2,4,6... row) forms point range.For example, from the beginning 41 (1) nozzle #1 ejection ink forms a little on the pixel of the 8th even column of going.Similarly, from the beginning 41 (1) nozzle #2 ejection ink forms a little on the pixel of the tenth even column of going.In addition, in the 2nd stroke, 41 (1) nozzle #15 and nozzle #16 of the inboard of the width in the adjacent head form point range 4,8, on the pixel of 12... row, and nearby 41 (2) of side nozzle #1 and nozzle #2 form point range 2,6, on the pixel of 10... row.That is, same with the 1st stroke, the nozzle of two adjacent statures 41 alternately sprays ink, forms point (for the 3rd following stroke and the 4th stroke too) on the pixel of even column.
After stroke 2 finishes, the moving of the secondary sub scanning direction when printing, head unit 40 moves the subscan amount F (7/720dpi) of regulation.
Similarly, in the stroke 3, in odd-numbered line (15,17,19... capable), the pixel of antithesis ordered series of numbers (2,4,6... row) forms point range.This result has finished for example point range of the 23rd row by stroke 1 and stroke 3.
After stroke 3 finishes, the moving of the sub scanning direction for the third time when printing, head unit 40 moves the subscan amount F (7/720dpi) with the first time and the identical size of secondary subscan amount.Like this, three each mobile amount of movement F of the sub scanning direction of head unit 40 are identical size.And, become the total (total subscan amount 3F) of three subscan amounts of head unit 40, less than the relation of effective nozzle width of a stature 41 of following explanation.
At first, describe for effective nozzle.For effective nozzle, have or not consideration method difference according to the overlapping nozzles (above-mentioned) between adjacent 41.Do not having under the situation of overlapping nozzles, each effective nozzle of 41 is whole nozzles (referring to Figure 11) of nozzle rows.On the other hand, have under the situation of overlapping nozzles, each effective nozzle of 41 will consider that overlapping nozzles decides.Particularly, effective nozzle of 41 is by nonoverlapping nozzle in this nozzle rows of 41 with utilize and nozzle that other 41 relation will this overlapping nozzles of 41 have been carried out uniform distribution constitutes.
At this, describe for how uniform distribution overlapping nozzles.For example, in Fig. 8,41 (1) nozzle #15, nozzle #16 is overlapping with 41 (2) nozzle #1, nozzle #2.At this moment, distribute overlapping nozzles as follows equably, that is, the nozzle #15 among said nozzle #15 and the nozzle #16 is included in 41 (1) the effective nozzle, and the nozzle #2 among said nozzle #1 and the nozzle #2 is included in 41 (2) the effective nozzle.Like this, according to making half nozzle in 41 the overlapping nozzles be included in mode in effective nozzle, distribute in 41 at this.
10 statures 41 of present embodiment have overlapping nozzles respectively, and each effective nozzle of 41 is as described below.Effective nozzle of 41 (1) is nozzle #1~nozzle #14; With with the overlapping nozzle #15 of 41 (2) nozzle #1, nozzle #2, nozzle #15 totally ten five nozzles among the nozzle #16.On the other hand, effective nozzle of 41 (2) is and 41 (1) overlapping nozzle #1, the nozzle #2 among the nozzle #2 of nozzle #15, nozzle #16; Nozzle #3~nozzle #14; With with the overlapping nozzle #15 of nozzle #1, the nozzle #2 of nozzle 41 (3), nozzle #15 totally ten four nozzles among the nozzle #16.Effective nozzle of 41 (3)~41 (9) is same with 41 (2), is nozzle #2~nozzle #15.On the other hand, effective nozzle of 41 (10) is and overlapping nozzle #1 of 41 (9) nozzle and the nozzle #2 among the nozzle #2; With nozzle #3~nozzle #16 totally ten five nozzles.
Then, describe for the effective nozzle width that determines according to above-mentioned effective nozzle.Effectively nozzle width is the width of the effective nozzle (this effective nozzle is in sub scanning direction, with being spaced of 2/720dpi) in sub scanning direction.In the present embodiment, because correct 41 (1) and 41 (10), effective nozzle is 15, so effective nozzle width of 41 (1) and 41 (10) is 30/720dpi.On the other hand, because 41 (2)~effective nozzle of 41 (9) is 14, so effective nozzle width of 41 (2)~41 (9) is 28/720dpi.And in printer 1, the total subscan amount 3F (21/720dpi) the during printing of head unit 40 is set to less than the little effective nozzle width (28/720dpi) in two effective nozzle widths.
Proceed the explanation of overstriking.In the stroke 4, in even number line (22,24,26... capable), the pixel of odd column (1,3,5... row) is formed point range.This result finishes for example point range of the 22nd row by stroke 2 and stroke 4.Like this, in the overstriking of present embodiment, form a point range by two different nozzles.
At this, formed by which nozzle of 41 for the point range (scan line) of print area and to be investigated.Wherein, the point range of print area is meant the point range finished as the point range of the 22nd row, is meant the point range that walks to L capable (Fig. 9) from 22 in the present embodiment.
At first, pay close attention to 22 and walk to 49 28 point ranges (scan line) of going.These point ranges by 41 (1), 41 (2) nozzle forms.When observing in detail, the 22nd walks to ten point ranges of 28 row, the 30th row, the 32nd row, the 34th row, and two different nozzles by 41 (1) form, and the 47th row, the 49th two point ranges of going are only formed by two different nozzles of 41 (2).On the other hand, the point range (16 point ranges) beyond above-mentioned in 28 point ranges, by 41 (1) and 41 (2) two side nozzle form.Like this, walk in the point ranges of 49 row 22, the quantity (12) of the point range that is formed by the nozzle of a stature 41 only is less than the quantity (16) of the point range that the nozzle by two statures 41 forms.
Then, pay close attention to 50 and walk to 77 28 point ranges of going.Wherein, the reason of paying close attention to by 28 point ranges is, the subscan amount F (7/720dpi) of head unit 40 is 1/4 times of effective nozzle width (28/720dpi), therefore the point range of print area is concatenated to form (forming in other words, the combination of the nozzle of each point range by 28 point range decisions) with 28 point ranges as one-period.That is, with 50 walk to 77 the row 28 point ranges same, 28 point ranges afterwards (for example, 78 walk to 105 the row point ranges) also with 22 walk to 49 the row 28 point ranges be identically formed.
And 50 walk to the point ranges of 77 row, by 41 (1), 41 (2), 41 (3) nozzle forms.When observing in detail, 51 row, 53 walk to eight point ranges of 56 row, 58 row, 60 row, 62 row, and two the different nozzles by 41 (2) form, 75 row, 77 two point ranges of going, and two the different nozzles by 41 (3) form.On the other hand, the point range (18 point ranges) beyond above-mentioned in 28 point ranges, the nozzle of any two statures by 41 (1), in 41 (2), 41 (3) forms.
Like this, even walk to 77 point ranges of going (promptly 50, under the situation of the combined cycle repetition of using nozzle, 28 point ranges corresponding) in one-period, the quantity (ten) of the point range that is formed by the nozzle of a stature 41 only also is less than the quantity (18) of the point range that the nozzle by two statures 41 forms.And in this print processing, the quantity of point range in the point range that comprises in the print area, that only formed by the nozzle of a stature 41 is less than the quantity of the point range that the nozzle by two statures 41 forms.
More than, the overstriking that relates to for present embodiment is illustrated.Then turn back to flow chart shown in Figure 7, continue the explanation of this print processing.When a formation that is through with by the point range that forms stroke 4 is handled (step S6: be), in other words, when on type belt T, having printed thing (image), controller 10 makes 40 to move (Fig. 4 I) at the driving lower edge of driver element 30 sub scanning direction, is located at original position (step S10).
Then, controller 10 will form the type belt T (the type belt T that printing finishes) of point from print area output (step S12) by conveyance unit 20.That is, outlet roller 22 is exported the type belt T that printing finishes from print area.
And under the situation of the print data that should print in addition (step S14: be), controller 10 repeats above-mentioned action (step S2~S12), print on type belt.On the other hand, do not having (step S14: deny) under the situation of print data, controller 10 finishes these print processing.
The validity of<this print processing 〉
In above-mentioned print processing, by the total subscan amount 3F (21/720dpi) of controller 10 according to the sub scanning direction of head unit 40, mode less than effective nozzle width (28/720dpi) of the sub scanning direction of a stature 41, head unit 40 is moved, thereby the width that can suppress the sub scanning direction of head unit 40 become big.
That is, as mentioned above, total subscan amount of head unit 40 is big more, the width of the sub scanning direction of head unit 40 also big more (referring to Fig. 6).Therefore, the total subscan amount by making head unit 40 can reduce total subscan amount of head unit 40 less than effective nozzle width of a stature 41, and realize overstriking (Fig. 8, Fig. 9).As a result, even cross in each stroke of overstriking under the situation of all zone ejection inks of width of type belt T, that the width that also can suppress head unit 40 becomes is big (41 quantity increase).
In addition, by the quantity of controller 10 according to scan line in the scanline groups (print area of Fig. 8 and Fig. 9 in scan line), that only form by the nozzle ejection ink of a stature 41, mode below the quantity of the scan line that forms for the nozzle ejection ink that makes plural 41, form scanline groups, thereby can suppress the deterioration of image quality.
That is, as mentioned above, only by a stature 41 (as illustrated in fig. 5,41 (3) or the spray volume that spray volume is few many 41 (5)) the quantity of scan line of nozzle formation many more, density unevenness become remarkable more (referring to Fig. 5) then.Therefore, the quantity of the scan line that forms by the nozzle that only makes by a stature 41, below the quantity for the scan line that forms by plural 41 nozzle, only can reduce the ratio (Fig. 8, Fig. 9) of scan line (becoming the scan line of density unevenness) in scanline groups that the nozzle by a stature 41 (41 or the spray volume that the spray volume in ten statures 41 is few many 41) forms.Therefore, can inhibition concentration uneven the change significantly, the result can suppress the deterioration of image quality.
In addition, by making the effective nozzle width of total subscan amount 3F, can suppress to become significant problem because of the density unevenness that adjacent 41 tie point causes less than a stature 41.That is, known: as, therefore when the positional precision of tie point is hanged down, therefore can to produce density unevenness because head unit 40 is that ten statures 41 have been carried out the unit that connects on sub scanning direction.And, forming by a plurality of strokes under the situation of images, for example, the tie point in tie point in the stroke 1 and stroke 2, when consistent, the density unevenness that is caused by tie point becomes remarkable on sub scanning direction.Relative therewith, as this print processing, by making the effective nozzle width of total subscan amount 3F less than a stature 41, as Fig. 8 and shown in Figure 9, owing to the tie point that has disperseed in stroke 1~stroke 4, thereby can the significant problem of the uneven change of inhibition concentration.
Therefore, according to above-mentioned print processing, the width that can suppress the sub scanning direction of head unit 40 becomes big, and suppresses the deterioration of image quality.
In addition, in above-mentioned print processing, controller 10 is in four strokes of stroke 1~stroke 4 (be equivalent to m time move), from whole 41 ejection inks.Thus, can enough Min. quantity 41, reduce a total subscan amount of 40 and realize overstriking.
And, in above-mentioned print processing, controller 10 (be equivalent to n time mobile) in three times of the sub scanning direction of head unit 40 are moved, (subscan amount F) is made as identical size with each amount of movement.Therefore, can form point range periodically, the occurrence positions of density unevenness is also disperseed regularly, becomes significantly thereby inhibition concentration is uneven effectively.
==the second embodiment==
Figure 10 represents the head unit 40 that second embodiment relates to.In this head unit 40, different with the head unit 40 that first embodiment shown in Figure 3 relates to, there is not the overstriking nozzle.In addition, because other the formation and first embodiment are same, therefore omit explanation.
In second embodiment, controller 10 also can (1) total amount of movement of sub scanning direction of head unit 40 when printing, the mode less than effective nozzle width of the sub scanning direction of a stature 41 moves head unit 40 under the driving of driver element 30; (2) according in the scanline groups, only make the nozzle ejection ink of a stature 41 and the quantity of the scan line that forms, the mode below the quantity of the scan line that forms for the nozzle ejection ink that makes plural 41 forms scanline groups.
Figure 11 is the figure of the overstriking that is used to illustrate that second embodiment relates to.In Figure 11, same with Fig. 8, only represented nozzle rows C, and each nozzle quantity of 41 also is 14.And, the point that forms with the nozzle of white circle (zero) expression 41 (1), the point that forms with the nozzle of black circle (●) expression 41 (2), the point that forms with the nozzle of white triangle (△) expression 41 (3) is with the point of the nozzle formation of black triangle (▲) expression 41 (4).And effective nozzle of shown in Figure 11 each 41 is respectively 14 of nozzle #1~nozzle #14, and each effective nozzle width of 41 is 28/720dpi, equates.
As shown in figure 11, the subscan amount F once of head unit 40 and first embodiment same (Fig. 8) are 7/720dpi, and total subscan amount 3F is 21/720dpi.And this total subscan amount 3F (21/720dpi) is less than effective nozzle width (28/720dpi).Therefore, same with first embodiment, the width that can suppress the sub scanning direction of head unit 40 becomes big.
In addition, different with Fig. 8, in Figure 11, only make the nozzle ejection ink of a stature 41 and the quantity of the scan line that forms, the quantity of the scan line that forms with making plural 41 nozzle ejection ink equates.This is owing in second embodiment, do not have overlapping nozzles.
At first, pay close attention to 22 and walk to 49 28 point ranges of going.The 22nd walks to ten point ranges of 28 row, the 30th row, the 32nd row, the 34th row, is only formed by 41 (1) nozzle, and four point ranges of 43 row, 45 row, 47 row, 49 row are formed by 41 (2) nozzle.That is, the point range that is only formed by 41 nozzle is 14.On the other hand, the point range (14 point ranges) beyond above-mentioned in 28 point ranges, by 41 (1) and 41 (2) two side nozzle form.Equally, walk in 28 point ranges of 77 row 50, the quantity of the point range that is formed by the nozzle of a stature 41 also is 14, and the quantity of the point range that is formed by the nozzle of two statures 41 is 14.
Like this, quantity by the scan line that forms according to the nozzle ejection ink that only makes a stature 41, mode below the quantity of the scan line that forms for the nozzle ejection ink that makes plural 41, form scanline groups, can be same with first embodiment, only can reduce the ratio of scan line in scanline groups by the nozzle formation of a stature 41 (41 or the spray volume that spray volume is few many 41) as Fig. 5 explanation like that.Therefore, even only suppose the scan line that the nozzle by a stature 41 forms, also can reduce the quantity of the scan line that becomes density unevenness, the result can inhibition concentration is uneven becomes significantly.
==the three embodiment==
Then, the overstriking that relates to for the 3rd embodiment describes.Figure 12 is the figure of the overstriking that is used to illustrate that the 3rd embodiment relates to.
In the 3rd embodiment, as shown in figure 12, also finish a scan line (overstriking) by four strokes.That is, between four strokes,, finish a scan line from each ejection ink.Particularly, the point of the 1st row and the 5th row is formed by stroke 1, and the point of the 2nd row and the 6th row is formed by stroke 2, and the point of the 3rd row and the 7th row is formed by stroke 3, and the point of the 4th row and the 8th row is formed by stroke 4.In addition, in Figure 12, represented to form a little yet be actually by more row to the point of the 8th row.
In addition, the head unit 40 (Fig. 3) of the head unit 40 of present embodiment and first embodiment is same.That is, in two adjacent statures 41, there is overlapping nozzles.And the nozzle distance of each nozzle is 1/360dpi.
The scan line of first, second embodiment be 1/720dpi (referring to Fig. 8, Figure 11) at interval, relative therewith, scan line shown in Figure 12 be spaced apart 2/720dpi (=1/360dpi) (that is, with nozzle apart from identical size).Therefore, different with first, second embodiment in the 3rd embodiment, do not interlock (interlace) prints.At this, staggered printing is meant, as Fig. 8 and shown in Figure 11, clips the printing type of inchoate scan line between the scan line that is formed by once stroke.
In addition, same with Fig. 8 in Figure 12, only represented nozzle rows C, and each nozzle quantity of 41 also is 16.In addition, at this for convenience of explanation, head unit 40 is described as the situation with three statures 41 (1)~41 (3).And, the point that forms with the nozzle of white circle (zero) expression 41 (1), the point that forms with the nozzle of black circle (●) expression 41 (2) is with the point of the nozzle formation of white triangle (△) expression 41 (3).
And the effective nozzle and first embodiment of shown in Figure 12 each 41 are same, as described below.Effective nozzle of 41 (1) is 15 nozzles of nozzle #1~nozzle #15, and its effective nozzle width is 30/720dpi.Effective nozzle of 41 (2) is 14 nozzles of nozzle #2~nozzle #15, and its effective nozzle width is 28/720dpi.Effective nozzle of 41 (3) is 15 nozzles of nozzle #2~nozzle #16, and its effective nozzle width is 30/720dpi.
And in the 3rd embodiment, the subscan amount F once of head unit 40 is 8/720dpi, and the total subscan amount 3F in four times the stroke is 24/720dpi.And, also be that total subscan amount 3F (24/720dpi) is set to the width (28/720dpi) less than the little effective nozzle in the width of two effective nozzles in the 3rd embodiment.Therefore, same with first embodiment, the width that can suppress the sub scanning direction of head unit 40 becomes big.
At this, form by which nozzle of 41 for each scan line of print area and to investigate.At this, the scan line of print area in the present embodiment is meant that R1 walks to the capable scan line of R30 as shown in figure 12.
At first, R1 walks to the capable scan line of R3 and is only formed by 41 (1) nozzle.R4 walks to the capable scan line of R15 and is formed by 41 (1) and 41 (2) nozzle.The scan line that R16 is capable and R17 is capable is only formed by 41 (2) nozzle.R18 walks to the capable scan line of R29 and is formed by 41 (2) and 41 (3) nozzle.And the capable scan line of R30 is only formed by 41 (3) nozzle.
And, when in the scope of above-mentioned effective nozzle width (28/720dpi), observing (at this, walking to the capable scan line of R27 with R4 is that example describes), the quantity of the scan line that only makes the nozzle ejection ink of a stature 41 and form, for R4 walks to capable 12 of R15, the quantity of the scan line that makes the nozzle ejection ink of two statures 41 and form, for R16 capable and R17 is capable two.
Like this, only make the nozzle ejection ink of a stature 41 and the quantity of the scan line that forms, be less than the nozzle ejection ink that makes plural 41 and the quantity of the scan line that forms.Thus, same with first embodiment, even only suppose the scan line that the nozzle by a stature 41 forms, also can reduce the quantity of the scan line that becomes density unevenness, the result can inhibition concentration is uneven becomes significantly.
In addition, in the above description, the subscan amount F of each time when carrying out four strokes is the 8/720dpi of identical size, yet the subscan amount of each time also can be different.In addition, in above-mentioned, some the forming of the 1st row (the 5th row) by the 1st stroke, some the forming of the 2nd row (the 6th row) by the 2nd stroke, o'clock the forming of the 3rd row (the 7th row) by the 3rd stroke, the 4th is listed as o'clock being formed by the 4th stroke of (the 8th being listed as), yet is not limited thereto.As long as the point of adjacent at least row, form by different strokes and to get final product.
And, in above-mentioned, form a scan line by four strokes, yet be not limited thereto.As long as form a scan line by two strokes (stroke that the integer more than 2 is inferior) at least, for example can form a scan line (first embodiment and second embodiment are too) by three strokes.
==other embodiment==
More than, based on above-mentioned embodiment the liquid ejection apparatus that the present invention relates to etc. is illustrated, yet the embodiment of foregoing invention is for the present invention being understood easily, not limiting the present invention.The present invention can change, improve under the situation that does not break away from its aim, and self-evident its equivalent all is included in protection scope of the present invention.
And, in the above-described embodiment, liquid ejection apparatus is embodied as ink-jet printer, yet be not limited to this, also can be embodied as the liquid ejection apparatus of ejection (injection) ink other liquid (for example, being dispersed with the such stream shape body of aqueous body, gel of the particle of functional material) in addition.For example can be: ejection be to disperse or the mode of dissolving comprises the liquid jet device of the material of the electrode material that uses in the manufacturing etc. of LCD, colour filter, EL (electroluminescent) display and face active display and look material etc.; Ejection is used for the liquid ejection apparatus of the biologic artifact of biochip manufacturing; Use and spray the liquid ejection apparatus of the liquid that becomes test portion as accurate pipette.In addition, can also be the liquid ejection apparatus that on precision optical machineries such as clock and watch or camera, sprays lubricating oil with pin point; In order to form employed small packaged lens (optical lens) such as optical communication device etc., and on substrate the liquid ejection apparatus of transparent resin liquid such as ejection ultraviolet curable resin; For substrate etc. is carried out etching and spray the liquid ejection apparatus of etching solutions such as acid or alkali; The stream shape body blowoff of ejection gel.And, the present invention can be applied to any one blowoff in these devices.
And, in the above-described embodiment, on sub scanning direction, move 3 times moving four times on the main scanning direction by making head unit 40 under the state that is stopping at type belt T, and form scan line (Fig. 8 and Fig. 9), yet be not limited thereto.For example, 40 of head units are moved at main scanning direction, type belt T is moved on sub scanning direction, forming scan line, in addition, can also be that head unit 40 does not move, and move on main scanning direction and sub scanning direction by type belt T, form scan line.That is, can relatively move on main scanning direction and sub scanning direction with respect to type belt T, form scan line by head unit 40.
In addition, in the above-described embodiment, make adjacent 41 overlapping nozzles (for example, 41 (3) nozzle #15 and 41 (4) nozzle #1) alternately spray ink, form a scan line (promptly, two overlapping nozzle boths spray ink), however be not limited to this.
For example, can only make side ejection ink in adjacent 41 the overlapping nozzles.Particularly, for 41 (3), nozzle #1, the #2 ejection ink from overlapping nozzles (nozzle #1, #2, #15, #16), and from nozzle #15, #16 ejection ink.Equally, for 41 (4), the also ejection of nozzle #1, the #2 from overlapping nozzles (nozzle #1, #2, #15, #16) ink, and from nozzle #15, #16 ejection ink.In this case, each effective nozzle number of 41 (14) equates.
In addition, in these cases, because it is identical being positioned at the user mode of nozzle (mainly being overlapping nozzles) at adjacent 41 tie point place, therefore with 41 tie point part corresponding scanning line also uniformly-spaced to form (promptly, form regularly), therefore can also suppress the density unevenness that causes because of tie point.

Claims (4)

1. liquid ejection apparatus is characterized in that possessing:
(a) head unit, it has a plurality of heads that are arranged with a plurality of nozzles to medium ejection liquid on described first direction along first direction, and relatively moving with the relative described medium of second direction that described first direction intersects, and spraying described liquid,
The width of the described first direction of described head unit is greater than the width of the described first direction of described medium;
(b) travel mechanism, it makes described head unit with respect to described medium, alternately repeatedly relatively moves on described second direction and described first direction; With
(c) control part, it makes the described relatively medium of described head unit by utilizing described travel mechanism, on described second direction and described first direction, alternately repeatedly relatively move, and make described nozzles different more than two spray described liquid respectively and form each scan line, form scanline groups
Carry out total amount of movement of the described first direction of described described head unit when repeatedly relatively moving according to described head unit, the mode less than effective nozzle width of the described first direction of a described head relatively moves described head unit by described travel mechanism,
According in the described scanline groups, only make the described nozzle of a described head spray described liquid and the quantity of the described scan line that forms, spray the mode below the quantity of the described scan line that described liquid forms for the described nozzle that makes plural described head, form described scanline groups.
2. liquid ejection apparatus according to claim 1 is characterized in that,
When the mobile number of times of the described second direction of described head unit being carried out described described head unit when repeatedly relatively moving, when being made as m time,
In described m time move, all described heads all spray described liquid.
3. liquid ejection apparatus according to claim 1 and 2 is characterized in that,
When the mobile number of times of the described first direction that described head unit is carried out described described head unit when repeatedly relatively moving, when being made as n time,
Described n each mobile amount of movement is identical size.
4. one kind scans line forming method,
(a) by head unit is alternately repeatedly relatively moved on second direction and first direction with respect to medium, and make nozzles different more than two spray liquid respectively and form each scan line, form each scanline groups, wherein, described head unit has a plurality of a plurality of heads that spray the nozzle of liquid to medium that are arranged with along described first direction on described first direction, relatively moving with the relative described medium of second direction that described first direction intersects, and spray described liquid, the width of the described first direction of described head unit is greater than the width of the described first direction of described medium, it is characterized in that
(b) carry out total amount of movement of the described first direction of described described head unit when repeatedly relatively moving according to described head unit, the mode less than effective nozzle width of the described first direction of a described head relatively moves described head unit,
According in the described scanline groups, only make the described nozzle of a described head spray described liquid and the quantity of the described scan line that forms, spray the mode below the quantity of the described scan line that described liquid forms for the described nozzle that makes plural described head, form described scanline groups.
CNA2008101496719A 2007-09-18 2008-09-16 Liquid ejecting apparatus and raster line forming method Pending CN101391533A (en)

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CN112440570B (en) * 2019-08-29 2023-05-26 精工爱普生株式会社 Liquid ejecting apparatus

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