CN101066639A - Liquid droplet spraying apparatus - Google Patents
Liquid droplet spraying apparatus Download PDFInfo
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- CN101066639A CN101066639A CNA200710079731XA CN200710079731A CN101066639A CN 101066639 A CN101066639 A CN 101066639A CN A200710079731X A CNA200710079731X A CN A200710079731XA CN 200710079731 A CN200710079731 A CN 200710079731A CN 101066639 A CN101066639 A CN 101066639A
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- Prior art keywords
- balancing gate
- narrowed portion
- liquid
- plate
- gate pit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
- B41J2002/14225—Finger type piezoelectric element on only one side of the chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2002/14306—Flow passage between manifold and chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14419—Manifold
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
A liquid droplet spraying apparatus includes: a plurality of nozzles, a plurality of pressure chambers respectively connected to the nozzles, the pressure chambers each configured to store liquid to which spraying pressure is selectively applied, a common ink chamber that stores the liquid supplied to the pressure chambers; and narrowing portions coupled between the common liquid chamber and the plurality of pressure chambers to supply the liquid therethrough. The narrowing portions are larger in a pressure loss than the common liquid chamber and the plurality of pressure chambers. A ratio of a length of each of the narrowing portions in a liquid flowing direction with respect to a length of corresponding one of the pressure chambers in the liquid flowing direction is 0.34 or more, wherein the liquid flowing direction corresponds to a direction in which the liquid flows through the narrowing portions.
Description
The cross reference of related application
Japanese patent application 2006-059804 number and 2006-059805 number whole disclosure submitting on March 6th, 2006 comprise that specification, claim, accompanying drawing and summary all are hereby expressly incorporated by reference.
Technical field
One embodiment of the present of invention relate to liquid droplet spraying apparatus, and it is used for by utilizing actuator that the balancing gate pit of storaging liquid is optionally applied expulsion pressure, from being connected in the nozzle ejection liquid particle of this balancing gate pit.
Background technology
Routinely, at atomizing of liquids droplet on the recording medium of printhead unit, utilizing ink by the scanning and printing head unit is known at the ink jet recording device of the enterprising line item of recording medium.This printhead unit has a plurality of balancing gate pits, the public ink chamber that is used to each balancing gate pit's supply ink that is used to store ink, the piezo-activator of being arranged to contiguous each balancing gate pit, and the drive circuit that is used to drive this piezo-activator; The piezo-activator that utilizes this drive circuit to drive is optionally exerted pressure to the balancing gate pit, so as ink droplet from the nozzle ejection that is connected in this balancing gate pit to recording medium.
When utilizing piezo-activator that the ink in the balancing gate pit is applied expulsion pressure, ink moves towards nozzle, and has simultaneously from this balancing gate pit to the providing ink side, just the trend of lateral movement upstream.Because ink moves the reduction ejection efficiency along the direction opposite with injection direction, should limit this motion as far as possible.After the atomizing of liquids droplet, the pressure in this balancing gate pit should descend, so that do not spray too much ink.
Therefore, conventionally, the pressure that the balancing gate pit in the ink flow path that forms in printhead unit or the pressure of nozzle reduce greater than other parts reduces, and the pressure of this inside, balancing gate pit reduces after the feasible injection ink, so that export the stable ink droplet.
But, in the conventional method of Miao Shuing, reduce in the above in order to obtain enough pressure in the balancing gate pit, needing increases the length of balancing gate pit or very little balancing gate pit's sectional area, thereby produces following problem.
At first, when the length of balancing gate pit increased, it is big that the whole dimension of printhead unit becomes, and the cycle of pressure oscillation is elongated.Cause writing down the restriction of number speed like this.Secondly, make when very little, in order to obtain to have the ink droplet of predetermined, must apply bigger pressure, and in the balancing gate pit, produce very big negative pressure the balancing gate pit when the sectional area of balancing gate pit.This will weaken jetting stability.And when large percentage that the pressure on nozzle side reduces, for the pressure that produces, the ratio of the volume of the liquid droplet of injection becomes less; As a result, jet velocity raises significantly, and the meniscus (meniscus) of nozzle the inside is easy to disappear.
Owing to these reasons, conventionally design a kind of structure, wherein public ink chamber utilizes the part that narrows down to be connected to the balancing gate pit as ink channel.Because the pressure that the pressure of this part that narrows down falls greater than public liquid chamber and balancing gate pit falls, thereby compare with the structure of routine and to obtain enough pressure and fall, and do not need unnecessarily to increase the length of balancing gate pit, also do not need to make the sectional area of balancing gate pit very little.As a result, when utilizing piezo-activator that the ink of the inside, balancing gate pit is exerted pressure, can produce ink stream effectively towards nozzle.And after spraying ink, the pressure in the balancing gate pit reduces, and therefore prevents to spray too much ink, thereby can enough high speeds carry out record with fabulous efficient.
Summary of the invention
But, in recent years, require ink jet recording device to have higher expressive ability.More specifically say, require them in gray scale (gradation) scope of broad, to carry out record with higher recording frequency.
Therefore, one embodiment of the present of invention provide a kind of can carry out record in the tonal range wideer than normal ranges, and can be with the liquid droplet spraying apparatus of the driving frequency atomizing of liquids droplet higher than conventional frequency.
According to an aspect of the present invention, liquid droplet spraying apparatus comprises: a plurality of nozzles of atomizing of liquids droplet; Be connected to a plurality of balancing gate pits of these a plurality of nozzles, each is configured to store the liquid that is optionally applied expulsion pressure this balancing gate pit; Storage is used to supply with the public balancing gate pit of the liquid of these a plurality of balancing gate pits; And be connected narrowed portion between this public liquid chamber and the individual a plurality of balancing gate pit, with from this public liquid chamber to this a plurality of balancing gate pits feed fluid, the pressure that the pressure of this narrowed portion falls greater than this public liquid chamber and these a plurality of balancing gate pits falls.Each narrowed portion along the length of liquid flow direction with respect to a balancing gate pit of correspondence along the ratio of the length of this liquid flow direction be 0.34 or more than, wherein this liquid flow direction is corresponding to the direction of this narrowed portion liquid flow.
According on the other hand, the width of this narrowed portion to the ratio of the degree of depth be 2.9 or more than.
According to a further aspect in the invention, this liquid droplet spraying apparatus also comprises: the cavity plate that limits these a plurality of balancing gate pits; Limit the manifold plate of this public liquid chamber; And being layered in supply plate between this cavity plate and the manifold plate, this supply plate limits this narrowed portion; Wherein this supply plate has the flat surfaces that forms narrowed portion along it, and each narrowed portion has an end to be connected in public liquid chamber, and the other end is connected in a corresponding balancing gate pit.
According on the other hand, this liquid droplet spraying apparatus also comprises: limit the nozzle plate of a plurality of nozzles, this nozzle plate is arranged on the opposite side of this supply plate with respect to this manifold plate.
According on the other hand, this liquid droplet spraying apparatus also comprises: the substrate that stacks with this supply flaggy; Wherein this narrowed portion forms flute profile respectively and is covered by this substrate on this supply plate, makes this substrate limit this narrowed portion with this supply plate; And should supply with the plate limited hole, an end of this through hole is connected in public liquid chamber with one of them narrowed portion, perhaps is connected to a corresponding balancing gate pit at its other end.
According on the other hand, this liquid droplet spraying apparatus comprises: a plurality of nozzles of atomizing of liquids droplet; Be connected to a plurality of balancing gate pits of these a plurality of nozzles, each is configured to store the liquid that is optionally applied expulsion pressure this balancing gate pit; Storage is used to supply with the public liquid chamber of the liquid of these a plurality of balancing gate pits; And be connected between this public liquid chamber and the individual a plurality of balancing gate pit, with from the narrowed portion of this public liquid chamber to this a plurality of balancing gate pits feed fluid, the pressure that the pressure of this narrowed portion falls greater than this public liquid chamber and these a plurality of balancing gate pits falls; Wherein each narrowed portion along liquid flow direction be shorter in length than the length of this balancing gate pit along flow direction, this liquid flow direction flows through the direction of this narrowed portion corresponding to this liquid, the width of this narrowed portion to the ratio of the degree of depth be 2.9 or more than.
Description of drawings
Describe embodiment in detail below with reference to accompanying drawing, wherein:
Fig. 1 illustrates the plane of ink jet recording device primary structure according to an embodiment of the invention;
Fig. 2 is the plane that illustrates from the printhead retainer of nozzle surface unilateral observation;
Fig. 3 A-3C is the partial view that remains on the printhead unit on this printhead retainer that illustrates along the 3-3 line intercepting of Fig. 2, wherein Fig. 3 A is local specification's diagrammatic sketch, Fig. 3 B is the explanation diagrammatic sketch that balancing gate pit and narrowed portion are shown, and Fig. 3 C is the explanation diagrammatic sketch that narrowed portion is shown;
Fig. 4 is the tabulation of summing up the data that obtain by first experiment;
Fig. 5 is the tabulation of summing up the data that obtain by second experiment;
Fig. 6 is the curve map that experimental data shown in Figure 4 is drawn and obtained on coordinate;
Fig. 7 A is the tabulation of summing up by the 3rd data that experiment obtains;
Fig. 7 B is the drive waveforms that is used for this experiment;
Fig. 7 C is the tabulation of summing up this experimental result, and expression is jetting stability when pulse width and pulse spacing variation; And
Fig. 8 is the curve map that the data shown in Fig. 7 A-7B are drawn and obtained on coordinate.
The specific embodiment
Describe according to embodiments of the invention below with reference to the accompanying drawings.
[primary structure]
The primary structure of ink jet recording device is at first described with reference to Fig. 1.Fig. 1 is the plane that this ink jet recording device primary structure is shown.
In the inside of this ink jet recording device 1, be provided with two axis of guides 6 and 7, also the printhead retainer 9 as carriage is installed on this axis of guide 6 and 7.On printhead retainer 9, be used for that ink is injected in recording paper P and upward remain on this printhead retainer 9 with the printhead unit 30 that writes down.This printhead retainer 9 is installed on the continuous belt 11 in two ends, utilizes carriage motor 10 these belts 11 rotations, and owing to the driving of this carriage motor 10 is moved along this axis of guide 6 and 7.
In addition, this ink jet recording device 1 has the ink tank 5a that is used to store yellow ink, is used to store the ink tank 5b of magenta ink, is used to store the ink tank 5c of blue-green ink, and the ink tank 5d that is used to store black ink.This ink tank 5a to 5d is connected to flexible ink supply conduit 14a, 14b, and 14c and 14d, and be transported to this printhead unit 30 via the pipe joint 20 that extends forward from this printhead retainer 9 from each ink barrel ink supplied.Paint ink or dye ink can be as the inks of every kind of color.
[structure of printhead unit]
The structure of printhead unit 30 is described below with reference to Fig. 2 and Fig. 3 A-3C.
Fig. 2 is the plane that illustrates from the printhead retainer 9 of nozzle surface unilateral observation; Fig. 3 A-3C is the partial sectional view that remains on this printhead unit on this printhead retainer 9 that illustrates along the arrow 3-3 intercepting of Fig. 2, wherein Fig. 3 A is local specification's view, Fig. 3 B is the explanation view that balancing gate pit and narrowed portion are shown, and Fig. 3 C is the explanation view that narrowed portion is shown.In the following description, the ink injection direction is downward.
As shown in Figure 2, on the nozzle surface 39e on the lower surface that is formed at this printhead unit 30, be used to spray the nozzle 39a of black ink, be used to spray the nozzle 39b of yellow ink, be used to spray the nozzle 39c of blue-green ink, and the nozzle 39d that is used to spray magenta ink is arranged to two rows respectively, so that extend along the moving direction (main scanning direction) perpendicular to this printhead retainer 9.Each nozzle is opened downwards, so that face toward the upper surface (Fig. 1) as the recording paper P of recording medium.
As shown in Figure 3A, this printhead unit 30 is constructed by the upper surface that piezo-activator 40 is adhered to cavity unit 50.This cavity unit 50 has such structure, wherein eight thin plates altogether: nozzle plate 39, and space bar 38, vibration damper plate 37, manifold plate 36 and 35 is supplied with plate 34, substrate 32, and cavity plate 31 is with the sequential cascade that begins from the bottom and bond together.Can be applicable to bonding between bonding and this cavity unit 50 and the piezo-activator 40 between this each plate such as the adhering device of bonding agent.
This piezo-activator 40 comprises active (active) parts 41 and 41 that are used to produce the energy that is used for spraying black ink, and the active parts 42 that is used to produce the energy that is used for spraying yellow ink.In fact, on the right side of active parts 42, though not shown in Fig. 3 A, also be provided with another active parts 42; On the right side of these parts, be provided with two active parts that are used to produce the energy that is used for spraying the blue-green ink, and more be provided with two active parts that are used to produce the energy that is used for spraying magenta ink in the right side at it.This active parts here is the parts that comprise piezo-activator, and is used for the ink of the inside, this balancing gate pit is exerted pressure and sprayed ink.
This piezo-activator 40 comprises piezoelectric patches and the alternately stacked membrane electrode made from piezoelectric.This active parts 41 is made of the piezoelectric patches part 41a that remains on along vertical direction between electrode 41b and the 41c, and another active parts constitutes similarly.
Be used for below each active parts, being formed between this manifold plate 36 and 35 to the public ink chamber of each balancing gate pit's supply ink.Below active parts 41, be formed with public 36a of ink chamber and the 35a that is used to store black ink with manifold plate 36 and 35 the insides.Below active parts 42, be formed with public 36b of ink chamber and the 35b that is used to store yellow ink with manifold plate 36 and 35 the insides.Though do not illustrate,, inside the manifold plate below being arranged at another active parts, be formed with the public ink chamber of the ink that is used for the injection of memory by using active parts.
Narrowed portion 34b is formed on giving in the plate 34 of the confession that is arranged at each public ink chamber top.Each narrowed portion 34b forms flute profile along the flat upper surfaces of this supply plate 34.The end of each narrowed portion 34b is connected in each public ink chamber via the through hole 34a that forms on the ink inflow side, so that pass through along vertical direction.
In addition, at the upper layers laminated substrate 32 of supplying with plate 34, so that cover the longitudinal opening surface of each narrowed portion 34b.The 31a of balancing gate pit is formed in the cavity plate 31 that is laminated on this substrate 32 in the position of the lower surface that faces toward each active parts.Each 31a of balancing gate pit is connected in the end of this narrowed portion 34b via the through hole 32a that forms in the ink outflow side, so as along vertical direction by being arranged on this cavity plate 31 and supplying with substrate 32 between the plate 34.
Store above the public 35a of ink chamber of black ink being used to, be formed with narrowed portion 34b, and this narrowed portion 34b is connected in this public 35a of ink chamber via through hole 34a, and be connected in the 31a of balancing gate pit via through hole 32a.
The vertical section area of this narrowed portion 34b is made the vertical section area less than connected balancing gate pit, thereby reduces so that its pressure reduces the pressure of being arranged to greater than this public ink chamber and balancing gate pit.In other words, this narrowed portion 34b plays a part such, makes the pressure oscillation component that is included in the pressure oscillation that produces and be applied to this public ink chamber in connected balancing gate pit alleviate.
On the lower surface that is arranged at the vibration damper plate 37 below each public ink chamber, be formed with damping chamber 37a.Each damping chamber 37a forms at the lower surface of this vibration damper plate 37 and opens downwards, and the shape of the cross section of this damping chamber 37a is identical with shape adjacent to the cross section of the public ink chamber lower surface of this vibration damper plate 37.
These vibration damper plate 37 usefulness such as metal material manufacturing that can strain, and can freely shake to public ink chamber side and this vibration damper plate side at the laminal bottom parts on this 37a top, damping chamber.Even if the pressure oscillation that produces in the balancing gate pit when spraying ink droplet propagates into public ink chamber, this bottom parts strain and vibrations, thereby has a damper effect that absorbs and reduce above-mentioned pressure oscillation, and produce the effect that prevents cross action, that is to say, prevent that pressure oscillation from propagating into other balancing gate pit.
Though be used for the through hole 30b that the ink in the balancing gate pit is guided nozzle into is vertically formed so that mutually by being arranged on each plate 32 to 38 between cavity plate 31 and the nozzle plate 39.Shown in the drive waveforms of Fig. 7 B, preferably, voltage (22V) is not applied on the electrode 41b and 41c of above-mentioned piezo-activator 40 when having injection, with the elongation active parts and reduce the volume of balancing gate pit, voltage application optionally stops the volume with the increase balancing gate pit when spraying, and applies voltage again so that the ink in this balancing gate pit is applied expulsion pressure after the preset time section.Raise and reduce the width P1 of the pulse (injection pulse) that constitutes and P2 and pulse spacing S1 and from the value that obtains as experimental result, select by voltage, wherein, the very little step-length of half skew in the intrinsic vibrations cycle of the ink of this cycle in this balancing gate pit.Voltage is undesired, and to apply and apply voltage also be possible to increase this active parts and ink is applied expulsion pressure.
[first experiment]
First experiment that the present inventor carries out will be described below.
The present inventor has analyzed can be in the relation between needed narrowed portion 34b of the tonal range of reappearing on the recording paper and the 31a of balancing gate pit in order to widen.
Shown in Fig. 3 B, represent with L2 corresponding to the length (hereinafter referred to as " length that narrows down ") of the narrowed portion 34b of ink flow direction, represent with L1 corresponding to the length (hereinafter referred to as " balancing gate pit's length ") of the 31a of balancing gate pit of ink flow direction.And, as the method that is used to obtain tonal range, utilization can (V2/V1), be provided with different drive waveforms simultaneously from the ratio of the volume V1 of the maximum liquid droplet volume V2 of the ink droplet of nozzle ejection and minimum liquid droplet (hereinafter referred to as " special body size droplet volume than ").When (L2/L1) changing, obtain this liquid droplet volume ratio (V2/V1) when this ratio between length L 2 and the balancing gate pit's length L 1 of narrowing down (hereinafter referred to as " length than ") then.This result of experiment is shown in Fig. 4 and Fig. 6.
In this experiment, the width of the 31a of balancing gate pit (width of the direction of the length L 1 in vertical and this plane) is fixed as 0.27mm, its degree of depth (thickness of cavity plate 31) is fixed as 0.05mm, the width of narrowed portion 34b is fixed as 0.085mm, its degree of depth is fixed as 0.03mm, and the fixed diameter of nozzle 39a is 0.02 to 0.03mm.In addition, room temperature is 25 ℃, and ink viscosity is set to 2 to 5cps.(diameter of nozzle 39a is identical in the viscosity experiment below of room temperature and ink.)
As shown in the figure, when the length L that narrows down 2 is 0.55mm, balancing gate pit's length L 1 is 2.96mm, and when length is 0.19 than (L2/L1), minimum liquid droplet volume V1 is 3pl (picoliter), and maximum liquid droplet volume V2 is 24pl, so liquid volume is 8 than (V2/V1).And be 0.70mm when the length L that narrow down 2, and when balancing gate pit's length is 1.42mm, and length is 0.49 o'clock than (L2/L1), and minimum liquid volume V1 is 2pl (picoliter), and maximum liquid droplet volume V2 is 24pl, so liquid volume is 12 than (V2/V1).
The experimental data that is shown in Fig. 4 is mapped on coordinate, and wherein the liquid droplet volume ratio is by vertical pivot (Y-axis) expression, and length is than by trunnion axis (X-axis) expression, and the curve map that is shown in Fig. 6 obtains by connecting each point.It is y=12.541x+5.7893 that the coordinate of this curve map closes.
Suppose that in the liquid droplet volume ratio be 10 or during the wide tonal range that obtains when above to obtain, be found to be obtain the liquid droplet volume ratio be 10 or more than, the length ratio should be 0.34 or more than.For example, in current experiment, when as shown in Figure 4, when the length L 2 that narrows down is set to 0.7mm, and balancing gate pit's length L 1 is when being set to 1.42mm, and can obtain the length ratio is 0.49, greater than 0.34, and the liquid droplet volume ratio becomes 12, thereby, can obtain the wide tonal range that should obtain.In addition, driving frequency can be set to the value of higher 26KHz.
[second experiment]
And the present inventor has carried out the influence of experiment with analysis length comparison recording quality.
Fig. 5 is the chart that this experimental result is shown.When length than changing and printing the not quality of observed and recorded simultaneously of load (Duty).Here print load and represent, the counting and the ratio that is used to form the driving time cycle of counting of physical record (printing) according to print data; In other words, when carrying out forming in each driving time cycle (so-called smearing (daubing)), this load is 100%, and when carrying out formation every a driving time cycle, this load is 50%." combination " expression printing in the figure loads on continually varying and carries out record simultaneously.This experiment is carried out under the driving frequency of 26KHz.In the figure, X represents wherein not form normal droplet from the ink of a plurality of nozzle ejection, but along the state of injection direction sputter or skew; Triangle represents that above-mentioned phenomenon occurs in the state in the plurality of nozzles; The state that the stable injection of circle expression can be carried out in all nozzles.
The width of the width of the 31a of balancing gate pit and the degree of depth and narrowed portion 34b and the degree of depth and first experiment are same in second experiment.
Result of experiment finds, when the length ratio is 0.35 or when above, regardless of printing load, recording quality improves.In this experiment, in length than being not carry out recording quality under 0.34 the situation to test; But, since with 0.35 the differing of length ratio of carrying out quality test only be 0.01, therefore think can obtain with length than being set to 0.35 o'clock same effect.
In addition,, make several products of same-type, and they have change in size in reality processing, but their characteristic there is not difference according to the various experiments that this inventor carries out.Therefore, above-mentioned difference is small enough to ignore and in the error range of machining.
In other words, find by first and second experiments, by the length ratio be set to 0.34 or more than, can in wide tonal range, carry out high quality record.And, find also that simultaneously jet velocity can be set to 5 to 15m/s, the in fact value that can not have problems.
[the 3rd experiment]
Below the experiment that the present inventor carries out will be described, to analyze when writing down with high speed (26KHz, above-mentioned value) when carrying out, the aspect ratio of narrowed portion 34b is to the influence of the recording quality of acquisition.
In this experiment, the length L 1 stuck-at-.42mm of the 31a of balancing gate pit, its width is fixed on 0.27mm, and its degree of depth is fixed on 0.05mm, and the length L 2 of narrowed portion 34b is fixed on 0.7mm.
The aspect ratio of narrowed portion 34b is represented perpendicular to the ratio of the depth D 1 (D2/D1) of transverse width D2 and this narrowed portion 34b longitudinally by this narrowed portion 34b's, shown in Fig. 3 C.
Carry out this experiment to analyze, whether can stably spray, the amount that keeps the volume of injected ink droplet being scheduled to simultaneously when to write down at a high speed when changing aspect ratio simultaneously.
Carry out the variation of this experiment with the ink droplet volume of the variation of analyzing drawing (map) mark stable when this aspect ratio variation and injection.The stability that quantizes when here, stable drawing mark sprays simultaneously by pulse width in the drive waveforms shown in Fig. 7 B and pulse spacing continually varying to spray obtains.In other words, the pulse width P1 of first droplet ejection pulse fixes in the drive waveforms shown in Fig. 7 B, the pulse width P2 of second droplet ejection pulse changes into P2a, P2b, P2c ... shown in Fig. 7 C, and the interval S1 between two injection pulses changes into S1a, S1b, S1c ... at the corresponding jetting stability of checking under the load in the respective combination of printing, experiment situation as shown in Figure 5 is the same then.Simultaneously, provide two round dots, a triangle form point, zero X point, and these points are added up and are obtained the stable drawing mark shown in Fig. 7 A.In addition, the volume of liquid droplet is the volume that obtains when above-mentioned two droplets make up.Fig. 8 is the curve map of data shown in Fig. 7 A.
Find that according to experimental result when aspect ratio increased, stable drawing mark at first had the trend that reduces sharp, changes lentamente then after aspect ratio reaches 2.90.And, have found that when aspect ratio increased, the ink droplet volume increased at first sharp, after aspect ratio reaches 2.90, change lentamente then almost become invariable.
In other words, according to the 3rd experiment, aspect ratio by narrowed portion 34b be set to 2.90 or more than, can obtain almost invariable jet performance reliably, wherein can obtain the needed maximum volume of injected ink droplet reliably, and under the situation of drive waveforms, though seldom according to the stable drawing of this drive waveforms mark, but stable injection is possible, in this case, even if the width of this narrowed portion and the degree of depth change, the liquid droplet volume still becomes almost invariable as mentioned above; Therefore make and be easy to carry out.
And the ink droplet jet velocity can be set to 5 to 15m/s, and this value can not have problems in practice.
[effect of embodiment]
(1) as mentioned above owing to use ink jet recording device 1 according to the foregoing description, by with length than (L2/L1) be set to 0.34 or more than, the tonal range of posting field can enlarge.
(2) and, by the aspect ratio (D2/D1) with narrowed portion 34b be set to 2.90 or more than, record can stably carry out under high speed, obtains simultaneously the needed maximum volume of injected ink droplet reliably.
(3) in addition, by limiting narrowed portion 34b along the flat surfaces of supplying with plate 34, this length than (L2/L1) can be easy to be set to 0.34 or more than.
(4) also have, because printhead unit 30 has a kind of like this structure, wherein a plurality of plates are laminated in together, can be easy to make nozzle, public ink chamber, narrowed portion and balancing gate pit; Specifically, having this narrowed portion 34b that desirable pressure falls can form at an easy rate.
[other embodiment]
(1) though ink jet recording device is an example with droplet deposition apparatus of the present invention, the present invention naturally can be with the equipment that acts on injection other liquid in addition to the ink.
(2) in addition, the present invention can also be used to utilize a kind of ink jet recording device of particular ink of color.
(3) also have, because the logical bubble that providing ink heat energy is produced in ink, the present invention can also be used to utilize pressure to change the ink jet recording device that sprays ink droplet, perhaps because electrostatic interaction utilizes the displacement of jolting plate to spray the ink jet recording device of ink droplet.
(4) though have a kind of like this structure according to the ink jet recording device of the foregoing description, wherein narrowed portion 34b and through hole 34a both are formed on and supply with in the plate 34, but also can have such structure, wherein have only narrowed portion 34b to be formed on and supply with on the plate 34, and have only through hole 34a form thereon space bar be arranged on this supply plate 34 below, perhaps a kind of like this structure, wherein narrowed portion is formed on the lower surface of base plate 32.
Claims (9)
1. liquid droplet spraying apparatus comprises:
A plurality of nozzles of atomizing of liquids droplet;
Be connected to a plurality of balancing gate pits of these a plurality of nozzles, each is configured to store the liquid that is optionally applied expulsion pressure this balancing gate pit;
Storage is used to supply with the public liquid chamber of the liquid of these a plurality of balancing gate pits; And
Be connected the narrowed portion between this public liquid chamber and a plurality of balancing gate pit, with from this public liquid chamber to this a plurality of balancing gate pits feed fluid, the pressure that the pressure of this narrowed portion falls greater than this public liquid chamber and these a plurality of balancing gate pits falls;
Wherein, each narrowed portion along the length of liquid flow direction with respect to a corresponding balancing gate pit along the ratio of the length of flow direction be 0.34 or more than, this liquid flow direction flows through the direction of this narrowed portion corresponding to liquid.
2. liquid droplet spraying apparatus according to claim 1, wherein the width of this narrowed portion to the ratio of the degree of depth be 2.9 or more than.
3. liquid droplet spraying apparatus according to claim 1 also comprises:
Limit the cavity plate of these a plurality of balancing gate pits;
Limit the manifold plate of this public liquid chamber; And
Be layered in the supply plate between this cavity plate and the manifold plate, this supply plate limits this narrowed portion;
Wherein this supply plate has the flat surfaces that forms narrowed portion along it; And
One end of each narrowed portion is connected in this public liquid chamber, and the other end is connected in a corresponding balancing gate pit.
4. liquid droplet spraying apparatus according to claim 3 also comprises:
Limit the nozzle plate of a plurality of nozzles, this nozzle plate is arranged on the opposite side of this supply plate with respect to this manifold plate.
5. liquid droplet spraying apparatus according to claim 3 also comprises:
The substrate that stacks with this supply flaggy;
Wherein this narrowed portion forms flute profile respectively on this supply plate, and is covered by this substrate, makes this substrate limit this narrowed portion with this supply plate; And
This supplies with the plate limited hole, and this through hole is connected to this public liquid chamber at the one end with one of them narrowed portion, perhaps is connected to one of them corresponding balancing gate pit at its other end.
6. liquid droplet spraying apparatus comprises:
A plurality of nozzles of atomizing of liquids droplet;
Be connected to a plurality of balancing gate pits of these a plurality of nozzles, each is configured to store the liquid that is optionally applied expulsion pressure this balancing gate pit;
Storage is used to supply with the public liquid chamber of the liquid of these a plurality of balancing gate pits; And
Be connected between this public liquid chamber and the individual a plurality of balancing gate pit, with from the narrowed portion of this public liquid chamber to this a plurality of balancing gate pits feed fluid, the pressure that the pressure of this narrowed portion falls greater than this public liquid chamber and these a plurality of balancing gate pits falls;
Wherein along liquid flow direction, the length that is shorter in length than this balancing gate pit of each narrowed portion, this liquid flow direction flows through the direction of this narrowed portion corresponding to this liquid; And
The width of this narrowed portion to the ratio of the degree of depth be 2.9 or more than.
7. liquid droplet spraying apparatus according to claim 6 also comprises:
Limit the cavity plate of these a plurality of balancing gate pits;
Limit the manifold plate of this public liquid chamber; And
Be layered in the supply plate between this cavity plate and the manifold plate, this supply plate limits this narrowed portion;
Wherein this supply plate has the flat surfaces that forms narrowed portion along it; And
One end of each narrowed portion is connected in this public liquid chamber, and the other end is connected in a corresponding balancing gate pit.
8. liquid droplet spraying apparatus according to claim 7 also comprises:
Form the nozzle plate of a plurality of nozzles, this nozzle plate is arranged on the opposite side of this supply plate with respect to this manifold plate.
9. liquid droplet spraying apparatus according to claim 7 also comprises:
The substrate that stacks with this supply flaggy;
Wherein this narrowed portion forms flute profile respectively and is covered by this substrate on this supply plate, makes this substrate limit this narrowed portion with this supply plate; And
This supplies with the plate limited hole, and this through hole is connected to this public liquid chamber at the one end with narrowed portion, or is connected to a corresponding balancing gate pit at its other end.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-059805 | 2006-03-06 | ||
| JP2006-059804 | 2006-03-06 | ||
| JP2006059804A JP2007237464A (en) | 2006-03-06 | 2006-03-06 | Liquid droplet jetting apparatus |
| JP2006059805 | 2006-03-06 | ||
| JP2006059805A JP2007237465A (en) | 2006-03-06 | 2006-03-06 | Liquid droplet jetting apparatus |
| JP2006059804 | 2006-03-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101066639A true CN101066639A (en) | 2007-11-07 |
| CN101066639B CN101066639B (en) | 2011-09-21 |
Family
ID=38583471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710079731XA Active CN101066639B (en) | 2006-03-06 | 2007-03-06 | Liquid droplet spraying apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2007237464A (en) |
| CN (1) | CN101066639B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102448727A (en) * | 2009-05-27 | 2012-05-09 | 京瓷株式会社 | Liquid discharge head and recording device using same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6846069B2 (en) * | 2002-05-10 | 2005-01-25 | Brother Kogyo Kabushiki Kaisha | Ink-jet head |
| JP3951119B2 (en) * | 2002-06-26 | 2007-08-01 | ブラザー工業株式会社 | Inkjet printer head |
| JP2004351879A (en) * | 2003-05-30 | 2004-12-16 | Kyocera Corp | Piezoelectric inkjet head |
-
2006
- 2006-03-06 JP JP2006059804A patent/JP2007237464A/en active Pending
-
2007
- 2007-03-06 CN CN200710079731XA patent/CN101066639B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102448727A (en) * | 2009-05-27 | 2012-05-09 | 京瓷株式会社 | Liquid discharge head and recording device using same |
| CN102448727B (en) * | 2009-05-27 | 2014-09-17 | 京瓷株式会社 | Liquid discharge head and recording device using same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101066639B (en) | 2011-09-21 |
| JP2007237464A (en) | 2007-09-20 |
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