CN101219600B - Liquid-jet head and liquid-jet apparatus having same - Google Patents
Liquid-jet head and liquid-jet apparatus having same Download PDFInfo
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- CN101219600B CN101219600B CN2008100026542A CN200810002654A CN101219600B CN 101219600 B CN101219600 B CN 101219600B CN 2008100026542 A CN2008100026542 A CN 2008100026542A CN 200810002654 A CN200810002654 A CN 200810002654A CN 101219600 B CN101219600 B CN 101219600B
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Abstract
The invention provides a liquid injection head, capable of making sure an sufficient ejecting quantity even in the condition for using a liquid with a high viscosity, and the liquid injection head with a good meniscus after injecting is in favor of the speed-up for printing. The liquid injection head comprises a pressure chamber which supplies liquid through a liquid supplying pass and forms a nozzle for injecting the liquid; a piezoelectric element which produces a pressure change in the pressure chamber, wherein, when the inertia and the flow path impedance of the liquid supplying pass is supposed to be M1 and R1 respectively, and the inertia and the flow path impedance of the nozzle is supposed to be M2 and R2 respectively, the relationships come into existence, that is M2<M1, R2>2R1.
Description
Technical field
The present invention relates to jet head liquid and have its liquid injection apparatus, especially be applicable under the situation of using full-bodied liquid useful.
Background technology
As liquid injection apparatus, the inkjet recording device that possesses ink jet recording head is arranged, this ink jet recording head possesses: for example utilize the pressure generating mechanism that is made of piezoelectric element to produce a plurality of pressure generating chamber of the pressure that makes the liquid ejection; Supply with the road from common storeroom to the China ink that each pressure generating chamber supplies with China ink separately; Be formed on each pressure generating chamber, the nozzle opening of ejection ink droplet.In described inkjet recording device, to the pressure generating chamber that is communicated with corresponding to lettering signal nozzle in China ink give energy, thereby make ink droplet ejection from nozzle opening.
Be not only in the past paper recently with the printing object of the literal of this kind inkjet recording device printing regulation, figure etc., it is multiple to spread all over plastics, glass etc.Yet, be that the China ink in the past of object is very unsuitable for the low printing object of absorbencys such as plastics with paper etc.Promptly, using with the China ink of paper as object, for example under the situation of printing on the plastics, with paper be object China ink viscosity (for example, under the normal temperature about 3.5 (mPas)) exist viscosity low excessively as the China ink that on plastics, prints, ink droplet is attached to the problem that flows takes place after the printing object.
Therefore, under the situation of printing on the little printing object of absorbabilities such as plastics, use the China ink of high viscosity (for example, under the normal temperature about 10.0 (mPas)).Only used full-bodied China ink, the structure of ink jet recording head self does not carry out any change in the past.That is, form the structure that in China ink supply road and nozzle opening, has the value of roughly the same degree respectively as the China ink supply road of the physical quantity of the ejection characteristic to China ink in this kind ink jet recording head being brought influence and the inertia (inertance) and the stream impedance of nozzle opening.
And, as investigating the above-mentioned inertia and even the conventional art of stream impedance, can enumerate patent documentation 1.
Patent documentation 1: the Japan Patent spy opens 2006-290000 communique (Fig. 1, [0022] to [2227] section)
But, use under the situation that full-bodied China ink prints with the ink jet recording head of prior art, few from the quantitative change of the ink droplet of nozzle opening ejection, not only press quality is caused harmful effect, meniscus after the ejection (meniscus) movement is also returned slowly, so produce the elongated problem of ejection cycle of China ink, thereby become the essential factor that hinders high speed printing.
Figure 24 is to use the ink jet recording head of conventional art, makes the China ink ejection of regulation, and the performance plot of the situation of simulation meniscus movement at this moment, and (a) viscosity of expression China ink is the situation of 5.0 (mPas), and (b) viscosity of expression China ink is the situation of 10.0 (mPas).In figure, transverse axis is time (μ s), and the longitudinal axis is the ejection weight (ng) of China ink.And, the viscosity the when viscosity of the China ink of this situation is ejection under the China ink temperature.
In addition, the set of data of other of this ink jet recording head is as follows.
The footpath of nozzle opening=24 μ m, China ink is supplied with the inertia M on road
1=1.5 * 10
8(kg/m
4), the inertia M of nozzle opening
2=1.4 * 10
8(kg/m
4), China ink is supplied with the stream impedance R on road
1=2.0 * 10
13(Pas/m
3), the stream impedance R of nozzle opening
2=2.1 * 10
13(Pas/m
3).
And, inertia M
1, M
2And stream impedance R
1, R
2All be the situation of the viscosity of China ink at 5.0 (mPas).
With reference to Figure 24 as can be known; viscosity at the China ink shown in figure (a) is under the situation of 5.0 (mPas); the ink droplet of ejection 12 (ng); and returning after the ejection is enough quick; but the viscosity at the China ink shown in figure (b) is under the situation of 10.0 (mPas); only can spray the ink droplet of 10 (ng), returning after the ejection is also very slow.
And this kind problem not only sprays the ink jet recording head of China ink, exists too in the jet head liquid of the liquid beyond spraying China ink.Be especially in use in the liquid head of printing industrial use in addition, the chance of spraying high viscosity liquid is many, thereby the problems referred to above are significantly changed.
Summary of the invention
The present invention is in view of above-mentioned prior art, even it is a kind of under the situation of using full-bodied liquid that purpose is to provide, can guarantee enough spray volumes, and the meniscus movement after the ejection is also good, the jet head liquid of the high speed that can help printing and have its liquid injection apparatus.
For achieving the above object, the jet head liquid of mode of the present invention is characterised in that, constitutes to possess: pressure generating chamber, and it supplies with the road feed fluid via liquid, and is formed with the nozzle opening that sprays described liquid; Pressure generating mechanism, it makes and produces the pressure variation in the described pressure generating chamber, and the inertia and the stream impedance of working as described liquid supply road are made as M respectively
1, R
1, the inertia and the stream impedance of described nozzle opening is made as M respectively
2, R
2The time, M
2＜M
1, and R
2＞2 * R
1Relation set up.
According to the manner, the ejection characteristic of liquid changes this known knowledge except that the ratio of the inertia of the inertia of supplying with the road based on liquid and nozzle opening, and then both stream impedance formed suitable relation, thereby determine the structure of liquid supply road and nozzle opening, even so under the situation of using full-bodied liquid, still can form the spray volume that can guarantee liquid, and the meniscus after the ejection return also better fluid injector head.Its result can keep using the press quality of the printing under the situation of high viscosity liquid well, and the high speed that helps printing.
Herein, aforesaid liquid sprays and is applicable to that the viscosity of using liquid is the above situations of 8.0 (mPas) first watch.In the case, can and there be the good printing that enterprising departure date of absorbefacient plastics hopes at surface smoothing.The viscosity of expecting described liquid especially is more than 8.0 (mPas) and below 20.0 (mPas).Because in the case, can form and can guarantee enough liquid spray volumes, and the meniscus after the ejection return also better fluid injector head.In addition, described stream impedance R
1, R
2Relation expectation be 3 * R
1≤ R
2≤ 20 * R
1Similarly, can form and can guarantee enough liquid spray volumes, and the meniscus after the ejection return also better fluid injector head.
And then the sectional area that the aforesaid liquid injector head is supplied with the road with described liquid is made as S
1, the sectional area of the liquid spraying outlet of described nozzle opening is made as S
2The time, preferably constitute S
2＜S
1Relation set up.In the case, can be with described inertia M
1, M
2And stream impedance R
1, R
2Easily form relation as above-mentioned regulation.
Other mode of the present invention is the liquid injection apparatus that possesses as each above-mentioned jet head liquid.
According to the manner, be particularly useful in as at surface smoothing and there is not a printing equipment of the printing that the enterprising departure date such as absorbefacient plastics hopes.
Description of drawings
Fig. 1 is the profile of the described record head of embodiment.
Fig. 2 is the key diagram of size of the each several part of expression record head shown in Figure 1.
Fig. 3 is the key diagram of the method for trying to achieve of expression inertia and stream impedance.
Fig. 4 is the stereogram of the piezoelectric element unit of Fig. 1.
Fig. 5 is the vertical view and the profile of the piezoelectric element unit of Fig. 1.
Fig. 6 is the chart of the China ink ejection characteristic of the described record head of the above-mentioned embodiment of expression.
Fig. 7 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Fig. 8 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Fig. 9 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 10 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 11 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 12 is the oscillogram of an example of expression drive waveforms.
Figure 13 is other the oscillogram of example of expression drive waveforms.
Figure 14 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 15 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 16 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 17 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 18 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 19 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 20 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 21 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 22 represents that the China ink of other the described record head of embodiment sprays the chart of characteristic.
Figure 23 is the schematic diagram that the tape deck of record head shown in Figure 1 is carried in expression.
Figure 24 is the chart of the China ink ejection characteristic of the described record head of expression conventional art.
Among the figure, 10-piezoelectric element unit; The 11-piezoelectric element; The 13-piezoelectric element forms parts; The 14-fixing base; The 15-piezoelectric material layer; The independent internal electrode of 16-; The common internal electrode of 17-; The non-formation of 21-electrode portion; The independent outer electrode of 22-; The common outer electrode of 23-; The 30-wiring substrate; The 31-drive IC; 33-connects distribution; The 50-stream forms substrate; 52-pressure generating chamber; The 53-storeroom; The 54-China ink is supplied with the road; The 55-oscillating plate; The 56-nozzle opening.
The specific embodiment
Below, explain embodiments of the present invention based on accompanying drawing.
＜the first embodiment 〉
Fig. 1 (a) is the profile as the short side direction of the pressure generating chamber of the ink jet recording head of an example of the described jet head liquid of embodiments of the present invention, and Fig. 1 (b) is the long side direction profile as the pressure generating chamber of the ink jet recording head of an example of jet head liquid.Shown in two figure, stream forms substrate 50 and is made of the silicon single crystal substrate, in the top layer of one side side part, is set up in parallel the pressure generating chamber 52 that is formed by a plurality of spaced walls 51 along its width (short side direction).In addition, long side direction one end side in each pressure generating chamber 52 is supplied with road 54 via supply with a kind of China ink in road as liquid, is communicated with to be used for to the storeroom 53 of each pressure generating chamber 52 supplies as a kind of China ink of liquid.In addition, the opening surface side that stream forms the pressure generating chamber 52 of substrate 50 is sealed by oscillating plate 55, and the another side side is applied the film connection via bonding agent or hot melt and penetrated the nozzle plate 57 that is provided with nozzle opening.
On oscillating plate 55, be fixed with a case 58, and in this case 58, piezoelectric element unit 10 quilts are positioning and fixing accurately with the China ink supply road that is connected with not shown a plurality of print cartridges.Promptly, case 58 is provided with the resettlement section 58a of perforation, on the inner face of the side of this resettlement section 58a, be fixed with piezoelectric element unit 10, and the front end of each piezoelectric element 11 is connected to each the island portion 59 that is arranged on corresponding on the zone of each pressure generating chamber 52 on the oscillating plate 55.
In described ink jet recording head, the displacement of the piezoelectric element 11 by following the supply that drives signal via oscillating plate 55, produces pressure oscillation in pressure generating chamber, and utilize this pressure oscillation, make the China ink that is filled in the pressure generating chamber 52 from nozzle opening 56 ejections.Herein, China ink is supplied with road 54 to each pressure generating chamber's 52 supply from storeroom 53 via each China ink.And the ejection characteristic of the China ink of this moment is supplied with the inertia and the stream impedance regulation of road 54 and nozzle opening 56 by China ink.
In the manner, the inertia of China ink being supplied with road 54 and nozzle opening 56 is made as M respectively
1, M
2, and the stream impedance that China ink is supplied with road 54 and nozzle opening 56 is made as R respectively
1, R
2The time, constitute and make M
2＜M
1, and R
2＞2R
1Relation set up.In addition, the viscosity of the China ink during use is used 8.0 (mPas), more preferably the above full-bodied China ink of 10.0 (mPas).China ink supply road 54 and nozzle opening 56 equidimensions are as shown in Figure 2 in addition.Herein, Fig. 2 (a) extracts the schematic diagram that the expression China ink is supplied with road 54, pressure generating chamber 52 and nozzle opening 56 parts, and Fig. 2 (b) is the profile that amplifies expression nozzle opening 56 parts.Shown in Fig. 2 (a), China ink is supplied with the length 600 μ m on road 54, width 55 μ m, height 80 μ m.In addition, the length 1000 μ m of pressure generating chamber 52.Nozzle has the tapering of the 80 μ m that diameter diminishes gradually towards front end shown in Fig. 2 (b), and forms the nozzle opening 56 of drum with the front end in this tapering with being connected.The footpath of this nozzle opening is 25 μ m.In addition, the height of described nozzle opening 56 parts is 20 μ m, and described drum part is 80 μ m with the thickness of the spray nozzle part that the tapering amounts to.
The method of trying to achieve of representational inertia and stream impedance is described herein.Shown in Fig. 3 (a), be under the situation of hollow cuboid at stream, its inertia M
Long=(ρ 1/wh), stream impedance R
Long=(12 μ l/wh
3).In addition, shown in Fig. 3 (b), be under the situation of cylinder at stream, its inertia M
Circle=(ρ 1/ π r
2), stream impedance R
Circle=(8 μ l/ π r
4).And in the following formula, μ is the viscosity of China ink, and ρ is the density of China ink.
Thereby China ink is supplied with the shape on road 54 and can be utilized and ask described inertia M with under the approximate situation of hollow cuboid
LongAnd stream impedance R
LongFormula, ask its inertia M
1And stream impedance R
1, in addition, the shape of nozzle opening 56 can be utilized and ask described inertia M with under the cylindric approximate situation
CircleAnd stream impedance R
CircleFormula, ask its inertia M
2And stream impedance R
2And, even can not carry out under the approximate situation of this kind, also can utilize integration to ask the inertia M of expectation with same computing
1, M
2And stream impedance R
1, R
2
And, as the relation of above-mentioned regulation, be made as S at the stream sectional area of China ink being supplied with road 54
1, the stream sectional area of the black ejiction opening of nozzle opening 56 is made as S
2The time, can be by constituting S
2＜S
1Relation set up and easily realize.
Fig. 4 is the stereogram that extracts expression piezoelectric element unit, and Fig. 5 is vertical view and the A-A line profile thereof of Fig. 4.For piezoelectric element unit 10, further append Fig. 4 and Fig. 5 explains herein.
As Fig. 4 and shown in Figure 5, this piezoelectric element unit 10 has: piezoelectric element forms parts 13, and it has the row 12 that a plurality of piezoelectric elements 11 are set up in parallel on its width; Fixing base 14, it is free-ended mode with leading section (end) side that piezoelectric element forms parts 13, engages its base end part (the other end).Herein, piezoelectric element form parts 13 by with piezoelectric material layer 15, constitute the internal electrode of two utmost points of piezoelectric element 11, promptly constitute and piezoelectric element 11 electricity of the adjacency common internal electrode 17 double team lamination and forming alternatively of the electric common common electrode of the piezoelectric element 11 of the independent internal electrode 16 of single electrode and formation and adjacency independently.
In addition, on piezoelectric element forms parts 13, for example waited by fret saw (wire saw) and form a plurality of slits 18, its leading section side is the broach shape by cutting, thus the row 12 of formation piezoelectric element 11.And, in two outsides of the row 12 of piezoelectric element 11, be provided with the location division 19 of the width wideer than each piezoelectric element 11.When this location division 19 embeds ink jet recording head with piezoelectric element unit 10, be used for positioning and voltage cell 10 accurately.
Herein, the independent internal electrode 16 that constitutes the single electrode of each piezoelectric element 11 spreads all over roughly whole the ground that piezoelectric element forms parts 13 basically and is provided with, but with the end face of fixing base 14 near relative location be separated into leading section side and base end part side.On the other hand, the common internal electrode 17 that constitutes common electrode also spreads all over roughly whole the ground setting that piezoelectric element forms parts 13 basically, but similarly separates near the leading section of piezoelectric element 11 with independent internal electrode 16.Promptly, the zone that piezoelectric element 11 engages with fixing base becomes the non-active region that does not participate in vibrating, but when the independent internal electrode 16 that constitutes piezoelectric element 11 and 17 of common internal electrodes are applied voltage, the domain oscillation of the leading section side that does not engage only with fixing base 14.
In addition, the outer surface at piezoelectric element formation parts 13 forms the outer electrode 20 that is connected with independent internal electrode 16 and common internal electrode 17.In addition, form the base end part side in corresponding with the row 12 of the piezoelectric element 11 at least zone of parts 13, have the non-formation of the electrode portion 21 of outer electrode 20 at piezoelectric element.
And, a plurality of slits 18 form the length that arrives the zone relative with the non-formation of this electrode portion 21, and outer electrode 20 is separated by this slit 18 and the non-formation of electrode portion 21, constitute and independently independent outer electrode 22 of piezoelectric element 11 electricity of adjacency and the common outer electrode 23 electric common with the piezoelectric element of adjacency.
Particularly, outer electrode 20 is separated into part relative with each piezoelectric element 11 and the part relative with location division 19, and the leading section that the outer electrode 20 in the zone relative with each piezoelectric element 11 forms parts 13 at piezoelectric element constitutes the independent outer electrode 22 that is electrically connected with the independent internal electrode 16 of the single electrode of formation piezoelectric element 11.On the other hand, be arranged at outer electrode 20 on the location division 19 of both sides of row 12 of piezoelectric element 11 forms the base end part side of parts 13 at piezoelectric element end and constitute the common outer electrode 23 that is connected with the common internal electrode 17 of the common electrode of each piezoelectric element 11 of formation.
Promptly, in piezoelectric element unit 10, form at piezoelectric element on the face of parts 13 and the opposition side of fixing base 14 engaging portion, be set up in parallel independent outer electrode 22, and independent outer electrode 22 be set up in parallel the direction both sides, there is common outer electrode 23 in the zone relative with location division 19.Thus, piezoelectric element unit 10 and wiring substrate described later can be connected with comparalive ease, and the miniaturization of piezoelectric element unit 10 can be realized.
This kind piezoelectric element unit 10 as shown in Figure 1, the face that forms the face opposition side of parts 13 with fixing piezoelectric element of fixing base 14 is fixed in the resettlement section 58a of a case 58.And, on piezoelectric element unit 10, connect to supply with the wiring substrate 30 of the film shape of the signal that is used to drive each piezoelectric element 11.
Described wiring substrate 30 disposes as follows, that is: drive IC 31 is the face side relative with fixing base 14, and drive IC 31 is at the middle section of the width of wiring substrate 30.And, an end that connects distribution 33 is electrically connected via metal level 35 with the independent outer electrode 22 and the common outer electrode 23 of the end side that is fixed in fixing base 14 of piezoelectric element 11, this metal level 35 for example after the surface of the surface that connects distribution 33 and independent outer electrode 22 and common outer electrode 23 forms tin (Sn)-metals such as bismuth (Bi) alloy, heating under the state that makes both butts and forming.
In addition, the other end of an end opposition side that is connected with piezoelectric element 11 of the connection distribution 33 of wiring substrate 30 is connected in the portion of terminal 61a of the input distribution 61 of the input wiring substrate 60 on the face that is arranged on oscillating plate 55 opposition sides of a case 58 with being bent.
Herein, the input wiring substrate 60 that is arranged at a case 58 is to be used for supplying with driving voltages and printing signal etc. from the outside to drive IC 31 and piezoelectric element 11.And, on the face of this kind input wiring substrate 60 because of the opposition side of the oscillating plate 55 that is arranged on a case 58, so the part that is connected with the portion of terminal 61a of the input distribution 61 of importing wiring substrate 60 is bent to about 90 degree, the end that connects distribution 33 is connected in portion of terminal 61a.And, connecting distribution 33 and portion of terminal 61a and be electrically connected via metal level 36, this metal level is for example by after forming metal such as tin-phosphor copper on the surface of the portion of terminal 61a of input distribution 61, heating under the state that makes both butts and forming.In addition, wiring substrate 30 is bonded on the fixing base 14 via UV cured type bonding agent (UV bonding agent) 40,41,42.
In described ink jet recording head, supply with road direction storeroom 53 via the China ink that is communicated with print cartridge and supply with China ink, and be assigned to each pressure generating chamber 52 via China ink supply road 54.At this moment, if by apply voltage to piezoelectric element 11 piezoelectric element 11 is shunk, then oscillating plate 55 is mentioned simultaneously with piezoelectric element 11, and the volume of pressure generating chamber 52 enlarges, thereby China ink is introduced in the pressure generating chamber 52.And, be full of inside with China ink till the nozzle opening 56 after, when according to the tracer signal from drive IC 31, when removing the voltage that is applied on the piezoelectric element 11, piezoelectric element 11 is upheld, and turns back to original state.Thus, oscillating plate 55 also displacement turns back to original state, so pressure generating chamber's 52 contractions, and internal pressure raises, from nozzle opening 56 ejection ink droplets.
In the manner, the China ink of the ejection characteristic of domination China ink is at this moment supplied with the inertia M of road 54, nozzle opening 56
1, M
2And stream impedance R
1, R
2Constitute as above-mentioned relation, so under the situation of using full-bodied China ink, can access good ejection characteristic.
Fig. 6 is to use the China ink of the described ink jet recording head of the manner ejection high viscosity (viscosity 10.0 (mPas)), under the situation of the meniscus movement of simulation this moment with Figure 24 (b) corresponding characteristics figure.In figure, transverse axis is time (μ s), and the longitudinal axis is the ejection weight (ng) of China ink.
In addition, other set of datas of this ink jet recording head are as follows.
The footpath of nozzle opening 56=24 μ m, China ink is supplied with the inertia M on road 54
1=1.9 * 10
8(kg/m
4), the inertia M of nozzle opening 56
2=1.4 * 10
8(kg/m
4), China ink is supplied with the stream impedance R on road 54
1=0.69 * 10
13(Pas/m
3), the stream impedance R of nozzle opening 56
2=4.3 * 10
13(Pas/m
3).
And, M
2(=1.4 * 10
8(kg/m
4))＜M
1(=1.9 * 10
8(kg/m
4)) and R
2(=4.3 * 10
13(Pas/m
3))＞2 * R
1(=2 * 0.69 * 10
13(Pas/m
3)) relation set up.Simultaneously, 3 * R
1≤ R
2≤ 20 * R
1Relation also set up
With reference to Fig. 6 as can be known, though viscosity under the situation of 10.0 (mPas), the ejection 12 (ng) ink droplet, and the ejection after return also very quick.
＜about other embodiment of jet head liquid 〉
The described jet head liquid of the manner is the ink jet recording head identical with above-mentioned embodiment shown in Figure 1, but each set of data difference.That is, the footpath of the nozzle opening 56 of the described ink jet recording head of present embodiment=25 μ m, China ink is supplied with the inertia M on road 54
1=2.0 * 10
8(kg/m
4), the inertia M of nozzle opening 56
2=1.5 * 10
8(kg/m
4), China ink is supplied with the stream impedance R on road 54
1=1.5 * 10
13(Pas/m
3), the stream impedance R of nozzle opening 56
2=6.8 * 10
13(Pas/m
3).And, M
2(=1.5 * 10
8(kg/m
4))＜M
1(=2.0 * 10
8(kg/m
4)) and R
2(=6.8 * 10
13(Pas/m
3))＞2 R
1(=2 * 1.5 * 10
13(Pas/m
3)) relation set up.Simultaneously, 3 * R
1＜R
2＜20 * R
1Relation also set up.And, in the described ink jet recording head of the manner, (R
2/ R
1)
5.
Fig. 7～Figure 11 is the performance plot identical with Fig. 6 that changes the ejection characteristic of the China ink under the situation of the viscosity of China ink and drive waveforms in the ink jet recording head of the manner respectively.Herein, drive waveforms is used two kinds of drive waveforms shown in Figure 12 and drive waveforms shown in Figure 13.Drive waveforms I shown in Figure 12 is the piezoelectric element 11 (with reference to Fig. 1) that 30% voltage with maximum voltage is applied as initial value, and (being followed successively by 2.0 μ s, 2.5 μ s, 2.5 μ s, 3.0 μ s, 3.0 μ s) applies the voltage of regulation during each of regulation.The piezoelectric element 11 (with reference to Fig. 1) that drive waveforms II shown in Figure 13 applies as initial value 10% voltage with maximum voltage, (being followed successively by 2.0 μ s, 2.0 μ s, 2.0 μ s, 3.0 μ s, 3.0 μ s) applies the voltage of regulation during each of regulation.Herein, the difference of drive waveforms II from initial value to maximum voltage so can piezoelectric element 11 distortion be increased with this amount, expands pressure generating chamber 52 (with reference to Fig. 1) greater than driving voltage I.Its result, the situation that applies drive waveforms II is carried out the supply of China ink more smoothly.
Herein, Fig. 7～Fig. 9 is for applying drive waveforms I, and uses the performance plot of situation of the China ink of viscosity 8.0 (mPas), 10.0 (mPas), 15.0 (mPas) respectively.The characteristic of Fig. 7 has been represented, the situation of the China ink of viscosity 8.0 (mPas), the ink droplet of ejection 13 (ng), ejection back produces some protuberances, but in practicality the no problem characteristic of returning.The characteristic of Fig. 8 has been represented, the situation of the China ink of viscosity 10.0 (mPas), and the ink droplet of ejection 12 (ng) returns very quick after the ejection.That is spray volume in the case and to return characteristic very good.The characteristic of Fig. 9 has been represented the situation of viscosity 15.0 (mPas), the ink droplet of ejection 11 (ng), and returning after the ejection is slow a little.
Figure 10 is that the viscosity of China ink is 15.0 (mPas), but applies the performance plot of the situation of drive waveforms II.In the case, the ink droplet of ejection 12 (ng) is compared with the situation of Fig. 9, and returning after the ejection also can be enough fast.
And Figure 11 is that to use viscosity in the present embodiment be the China ink of 5.0 (mPas), the performance plot of situation about driving with drive waveforms I.Represented that in the case the protuberance after the ejection becomes excessive (that is, meniscus swells in nozzle face), the result is that ejection is unstable.
Figure 14 establishes (the stream impedance R of nozzle opening 56 in the manner
2)/(China ink is supplied with the stream impedance R on road 54
1)=3, and use the China ink of viscosity 8.0 (mPas), the performance plot of situation about driving with drive waveforms I.This has represented satisfying R
2＞2R
1The basis of important document on, by selected R aptly
2/ R
1Ratio, compare with the situation of the China ink of use viscosity identical (8.0 (mPas)) shown in Figure 7, can suppress the protuberance after the China ink ejection.
Figure 15 and Figure 16 establish (the stream impedance R of nozzle opening 56 in the manner
2)/(China ink is supplied with the stream impedance R on road 54
1)=20, and use viscosity 15.0 (mPas) (Figure 15), 20.0 (mPas) China ink (Figure 16), the performance plot of situation about driving with drive waveforms I.This also satisfies R
2＞2R
1And 3 * R
1≤ R
2≤ 20 * R
1Important document.With reference to Figure 15 as can be known, with R
2/ R
1The characteristic shown in Figure 9 that condition in addition is identical is compared, and the delay of returning characteristic is improved significantly.That is, the China ink high viscosity that becomes more, expectation increases R more
2/ R
1
In addition, Figure 17 establishes R
2/ R
1=20, and use the China ink of viscosity 20.0 (mPas), the performance plot of situation about driving with drive waveforms II.As shown in the figure as can be known, by driving, compare with the situation of Figure 16 that only drive waveforms I is different with the low drive waveforms II of the initial value of driving voltage, the characteristic of returning after the ejection is significantly improved.That is, the China ink high viscosity that becomes more, expectation drives with drive waveforms II more.
Figure 18～Figure 21 be used for the ejection characteristic comparison of the described ink jet recording head of the manner, expression establishes R
2/ R
1=1 the figure of ejection characteristic of the ink jet recording head of structure in the past, and apply drive waveforms I, using viscosity respectively is the performance plot of situation of the China ink of 8.0 (mPas), 10.0 (mPas), 15.0 (mPas), 20.0 (mPas).Demonstrate with reference to these figure, removing viscosity is the situation of 8.0 (mPas), and during full-bodied China ink more than using it, returning after the ejection is slow, and this tendency becomes more remarkable when becoming high viscosity.Even but with R
2/ R
1=1 ink jet recording head under the situation of the China ink of use viscosity 10.0 (mPas), if use drive waveforms II, as shown in figure 22, returns characteristic and is improved to the practical no problem degree that.But, if viscosity more than 15 (mPas), then can't obtain the practical no problem characteristic of returning that.
From above analog result as can be known, according to the manner, even full-bodied China ink still can easily be adjusted positively to obtain the good characteristic of returning.Thereby the outside air temperature owing to use the time causes still accessing stable ejection characteristic under the situation of viscosity increase and decrease.In contrast, though in the past the structure (R
2/ R
1=1) situation, viscosity are about 8.0, utilize other condition that enough situations of returning characteristic that obtains are also arranged, if but the temperature etc. of taking all factors into consideration environment for use makes the key element of viscosity change, the amplitude of the variations in temperature that can follow narrows down, and therefore sprays characteristic and becomes unstable.As a result, using under the situation of full-bodied China ink, compared with the past, the ink jet recording head of the manner can access more stable ejection characteristic, and can positively help the high speed that prints.
＜about other embodiment of jet head liquid 〉
More than, embodiments of the present invention have been described, but the present invention is not limited thereto certainly.For example, the described ink jet recording head of above-mentioned embodiment is for having alternatively lamination of the piezoelectric of making and electrode material, thereby make its head at the longitudinal vibration ejector half actuator of axial stretching, but as make pressure generating chamber produce pressure generating mechanism that pressure changes be applicable to too the actuator with film-type piezoelectric element head and have the crown etc. of piezoelectric element of the actuator of the thick-film type that forms by applying raw cook methods such as (green sheet).In addition, as pressure generating mechanism, also can be applicable to, in pressure generating chamber, dispose heater element, thereby the bubble that the heating that utilizes heater element produces makes the so-called bubble type actuator of drop ejection from nozzle opening, or makes between oscillating plate and the electrode and produce static, utilize electrostatic force to make oscillating plate distortion, thereby from the so-called electrostatic actuator of nozzle opening ejection drop etc.Mainly be as long as supply with road direction pressure generating chamber feed fluid from liquid, and utilize the pressure that produces in pressure generating chamber, the device that sprays drop via nozzle opening gets final product.In the case, no matter which kind of form all obtains liquid ejection characteristic same as shown in Figure 1.
In addition, the present invention is an object with the jet head liquid integral body of broad sense, also can be applicable to the jet head liquid that sprays China ink liquid in addition certainly.As other jet head liquid, for example as, be used for image recording structure such as printer various record heads, be used for colour filter such as LCD look material injector head, be used for electrode material injector head that OLED display, FED (electric field transmitted display) electrode of etc.ing form, to be used for the living body organic matter injection that biochip (chip) makes first-class.
＜have a liquid jet recording device of the jet head liquid of above-mentioned embodiment 〉
The described ink jet recording head of above-mentioned embodiment constitutes the part of the head unit that possesses the black stream that is communicated with print cartridge etc., and lift-launch is on inkjet recording device.Figure 23 is the schematic diagram of an example of its inkjet recording device of expression.Shown in figure, head unit 1A and 1B with the described ink jet recording head of above-mentioned embodiment releasably are arranged at print cartridge 2A and the 2B that constitutes black feed mechanism, and carry the mobile vertically balladeur train axle 5 that is installed on the apparatus main body 4 that is arranged on freely of balladeur train 3 of this head unit 1A and 1B.This head unit 1A and 1B for example are respectively ejection tusche constituent and color ink constituent.
And the driving force of drive motor 6 is via not shown a plurality of gears and be with 7 to pass to balladeur train 3 synchronously, and the balladeur train 3 that carries head unit 1A and 1B thus moves along balladeur train axle 5.On the other hand, be provided with pressing plate 8, hang on the pressing plate 8 as the recording sheet S volume of the recording mediums such as paper by not shown paper feedings such as feed roll and carry at apparatus main body 4 upper edge balladeur train axles 5.
Claims (4)
1. a jet head liquid is characterized in that, constitutes to possess:
Pressure generating chamber, it supplies with the road feed fluid via liquid, and is formed with the nozzle opening that sprays described liquid;
Pressure generating mechanism, it makes and produces the pressure variation in the described pressure generating chamber, and
When inertia and the stream impedance of described liquid being supplied with the road are made as M respectively
1, R
1, the inertia and the stream impedance of described nozzle opening is made as M respectively
2, R
2The time, M
2＜M
1, and R
2＞2R
1Relation set up,
The viscosity of described liquid is more than the 8.0mPas and below 20.0mPas.
2. jet head liquid according to claim 1 is characterized in that,
Described stream impedance R
1, R
2The pass be 3R
1≤ R
2≤ 20R
1
3. jet head liquid according to claim 1 is characterized in that,
When the sectional area of described liquid being supplied with the road is made as S
1, the sectional area of the liquid spraying outlet of described nozzle opening is made as S
2The time,
Constitute S
2＜S
1Relation set up.
4. a liquid injection apparatus is characterized in that,
Possesses the described jet head liquid of claim 1.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007005030 | 2007-01-12 | ||
| JP2007005030 | 2007-01-12 | ||
| JP2007-005030 | 2007-01-12 | ||
| JP2007325193 | 2007-12-17 | ||
| JP2007325193 | 2007-12-17 | ||
| JP2007-325193 | 2007-12-17 | ||
| JP2008-001268 | 2008-01-08 | ||
| JP2008001268 | 2008-01-08 | ||
| JP2008001268A JP2009166242A (en) | 2007-01-12 | 2008-01-08 | Liquid-jet head and liquid-jet apparatus having the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101219600A CN101219600A (en) | 2008-07-16 |
| CN101219600B true CN101219600B (en) | 2011-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100026542A Active CN101219600B (en) | 2007-01-12 | 2008-01-14 | Liquid-jet head and liquid-jet apparatus having same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2009166242A (en) |
| CN (1) | CN101219600B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011067999A (en) * | 2009-09-25 | 2011-04-07 | Seiko Epson Corp | Method of ejecting liquid and liquid ejection device |
| JP2011073245A (en) * | 2009-09-30 | 2011-04-14 | Seiko Epson Corp | Liquid ejecting head and liquid ejecting apparatus |
| EP2623322A4 (en) * | 2010-09-29 | 2017-10-18 | Kyocera Corporation | Liquid ejection head, and liquid ejection head device, liquid ejection device and printing method using the liquid ejection head |
| JP2012136010A (en) | 2010-12-06 | 2012-07-19 | Seiko Epson Corp | Liquid spraying head and liquid spraying apparatus |
| JP5854193B2 (en) * | 2011-08-24 | 2016-02-09 | セイコーエプソン株式会社 | Liquid ejecting head and liquid ejecting apparatus having the same |
| JP5975202B2 (en) * | 2012-01-24 | 2016-08-23 | セイコーエプソン株式会社 | Liquid ejecting head and liquid ejecting apparatus |
| US9352564B2 (en) | 2012-04-19 | 2016-05-31 | Hewlett-Packard Development Company, L.P. | Determining an issue in an inkjet nozzle with impedance measurements |
| JP6760049B2 (en) * | 2016-12-26 | 2020-09-23 | セイコーエプソン株式会社 | Liquid injection head, liquid injection device, liquid circulation method and liquid discharge method |
| WO2019230805A1 (en) * | 2018-06-01 | 2019-12-05 | 日本電産株式会社 | Liquid agent coating device |
| JP2021084283A (en) * | 2019-11-27 | 2021-06-03 | ブラザー工業株式会社 | Liquid discharge head |
| WO2023157127A1 (en) * | 2022-02-16 | 2023-08-24 | コニカミノルタ株式会社 | Inkjet head and inkjet recording device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0873871A3 (en) * | 1997-03-27 | 1999-08-18 | Xerox Corporation | Thermal ink jet printhead suitable for viscous inks |
| JP2005297557A (en) * | 2004-03-18 | 2005-10-27 | Brother Ind Ltd | Inkjet head |
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2008
- 2008-01-08 JP JP2008001268A patent/JP2009166242A/en active Pending
- 2008-01-14 CN CN2008100026542A patent/CN101219600B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| JP特开平10-315462A 1998.12.02 |
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|---|---|
| JP2009166242A (en) | 2009-07-30 |
| CN101219600A (en) | 2008-07-16 |
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