CN103182842A - Droplet injection apparatus and method for driving droplet injection apparatus - Google Patents
Droplet injection apparatus and method for driving droplet injection apparatus Download PDFInfo
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- CN103182842A CN103182842A CN2012105992860A CN201210599286A CN103182842A CN 103182842 A CN103182842 A CN 103182842A CN 2012105992860 A CN2012105992860 A CN 2012105992860A CN 201210599286 A CN201210599286 A CN 201210599286A CN 103182842 A CN103182842 A CN 103182842A
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- 239000007924 injection Substances 0.000 title claims abstract description 45
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- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
-
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/10—Finger type piezoelectric elements
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
A problem to be solved by the present invention is to provide a droplet injection apparatus controlling the driving in such a way that an ink injection operation is sequentially performed by time division by dividing all the channels into two or more groups, each being formed of the channels away from one another with one or more channels placed therebetween, and applying a drive signal to each group, the ink has a viscosity of less than 5.0*10 -3 Pasec, the drive signal contains a first pulse formed as a rectangular wave and increasing the volume of the channel and restoring the volume to the original volume after a lapse of a given period of time and a second pulse formed as a rectangular wave and reducing the volume of the channel and restoring the volume to the original volume after a lapse of a given period of time, and the ratio of a voltage Von of the first pulse to a voltage Voff of the second pulse is 0.5<=|Von/Voff|<=0.8.
Description
Technical field
The present invention relates to the driving method of a kind of liquid droplet ejection apparatus and liquid droplet ejection apparatus, in more detail, relate to and a kind ofly can stably spray low viscous ink and be not subjected to liquid droplet ejection apparatus that the injection of adjacent nozzles influences and the driving method of liquid droplet ejection apparatus.
Background technology
Liquid droplet ejection apparatus with record head is widely used as by making ink droplet be attached to the ink-jet recording apparatus that records and form desirable ink jet image on the recording mediums such as record-paper, and this record head will spray in small ink droplet mode as the ink in the passage of pressure generating chamber from nozzle.In the field of this ink-jet recording apparatus, the demand height of the ink-jet ink of industrial use wishes to spray the ink of various rerum naturas.Particularly, in recent years, consider the influence to environment, to being that the concern of the water-base ink of primary solvent becomes very high with water.Ink viscosity is lower mostly owing to the rerum natura of water for water-base ink.
Viscosity less than 5.0 * 10
-3The low viscosity inks of Pasec (pascal second) is owing to diminish in the viscous drag of the channel interior of record head, so the vibration of the meniscus (メ two ス カ ス) in the nozzle is bigger.Therefore, when record head drive actuator during with the ink in the nozzle ejection passage, in course of injection, produce the problem that air is involved in nozzle interior.
Particularly, be under the situation of shear mode-type record head at employed record head, this problem produces more significantly, in the shear mode-type record head, the next door that adjacency channel is common is as actuator, drive the next door corresponding with the passage that is set up in parallel by timesharing respectively, successively the ink in each passage of nozzle ejection.
Namely, because the record head of shear mode-type can not spray ink droplet simultaneously at adjacency channel, so the ink in a passage is during from nozzle ejection, the passage that is adjacent does not spray ink simultaneously, but in fact, the next door of passage is subjected to making the ink in the adjacency channel also produce pressure, thereby having the problem that the meniscus in the adjacent nozzle of injection channel is extruded because spraying the influence that distortion that ink droplet produces drives.When the meniscus extrusion capacity is big, when meniscus is drawn in the nozzle again, can be involved in air, thereby can not stably sprays ink afterwards.
And then also spraying under the situation of ink droplet from the passage adjacent with the passage that sprays ink droplet, because extruding by the injection action of ink droplet of this meniscus offset, so not extruding of this meniscus can become problem, but, be not spray under the situation of non-injection channel of ink droplet to become significant problem at the passage adjacent with the passage that sprays ink droplet.Particularly,, because non-injection channel is subjected to the influence of the driving pressure of the adjacent injection channel in both sides, spray so the most difficult realization is stable for passage drive pattern arranged side by side for injection channel and non-injection channel.
Fig. 9 is illustrated in and uses viscosity 3.8 * 10
-3Pasec (=3.8cp) and viscosity 5.7 * 10
-3Pasec (=5.7cp) this two kinds of inks and when utilizing the shear mode-type record head to carry out three circulations respectively to drive (driving every a passage one), the time of the meniscus extrusion capacity in the nozzle of non-injection channel changes.
As shown in Figure 5, to drive be to organize three groups and timesharing drive the shear mode-type record head of passage 31 by group one of driving method with as one group all passages 31 being divided into A group, B group, C every the passage 31 of two passes in three circulations.In Fig. 9, being conceived to the even-numbered channels in each passage 31 is to carry out injection channel that ink sprays and according to the specific non-injection channel (odd chanel) that the A of order (A circulation → B circulation → C circulation) when driving of A group → B group → C group organizes, represent the time variation of its meniscus extrusion capacity.With the even-numbered channels be injection channel here.Therefore, the odd chanel in the A group passage this as non-injection channel, yet since the adjacent B group in its both sides, the passage of C group all be even-numbered channels and be injection channel, so be subjected to the influence of this injection channel easily.
From this figure as can be known, the more low meniscus extrusion capacity of ink viscosity is more big.If the meniscus extrusion capacity increases, the risk that is involved in air when then meniscus returns in the nozzle increases.Because in reality is printed, always do not drive all passages, even if when three circulations drive, also may produce the non-injection channel that is clipped between the injection channel as described above according to printed data, therefore can not ignore because the meniscus extrusion capacity increase in the nozzle of this non-injection channel causes producing the problem that air is involved in.
, in patent documentation 1, disclosed in order to reduce the influence to the passage adjacent with ink ejection channels in the past, the passage that sprays and the dummy channels of not spraying alternately be set.Yet this method is difficult to improve the density (spray nozzle density) of passage, thereby is difficult to realize printing raising and the high image qualityization of productivity ratio.
In addition, in patent documentation 2, disclose the stable of when realizing high-speed driving meniscus, and the voltage ratio of first pulse and second pulse has been set at more than 1.2, below 5.0.Yet this technology is conceived to suppress the meniscus oscillations of this nozzle behind the nozzle ejection ink, considers to use viscosity less than 5.0 * 10 not especially
-3When the low viscosity inks of Pasec drives to the influence of the meniscus of adjacency channel.In this technology, as mentioned above, carry out under the situation that timesharing drives using the shear mode-type record head and utilize three circulations to drive, at all can not solve since the meniscus of the nozzle of the non-injection channel adjacent with injection channel extrude the problem that is involved in air that causes.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2000-15802 communique
Patent documentation 2: TOHKEMY 2001-310461 communique
Summary of the invention
The present invention In view of the foregoing makes, problem to be solved is, the driving method of a kind of liquid droplet ejection apparatus and liquid droplet ejection apparatus is provided, its adopting low viscosity inks to utilize timesharing to drive from the next door that adjacency channel is common as actuator and the shear mode-type record head of detrusion carries out ink droplet when spraying, the vibration of the meniscus by making the adjacent non-injection nozzle of the nozzle that sprays is stable, can carry out stable ink droplet from record head and spray.
The problem that other will solve of the present invention from following record as can be known.
The technological means that is used for the technical solution problem
Above-mentioned problem utilizes following each invention to solve.
1. a liquid droplet ejection apparatus is characterized in that, comprising:
Record head, it has a plurality of nozzles that spray ink droplet, many passages that are set up in parallel that are communicated with described nozzle respectively, is made of and thereby detrusion makes the volume-variation of described passage make ink in this passage from the actuator of described nozzle ejection owing to drive applying of signal the next door, and described next door is had by adjacent described passage and is made of piezoelectric;
Drive signal generating apparatus, it generates described driving signal, and described driving signal comprises for a plurality of driving pulses that drive described actuator,
Will across one or more described passage and the described passage that is separated from each other is classified as one group, whole described passages are divided into plural group, applying described driving signal by each group, and the mode that the ink injection action is carried out in timesharing successively drives the described record head of control
The viscosity less than 5.0 * 10 of described ink
-3SPasec,
Described driving signal comprises first pulse and second pulse, described first pulse is made of the cubical expansion that makes described passage and the square wave that reverts to former volume behind certain hour, described second pulse is shunk by the volume that makes described passage and the square wave that reverts to former volume behind certain hour constitutes
The ratio of the voltage Von of described first pulse and the voltage Voff of described second pulse is 0.5≤| Von/Voff|≤0.8.
2. according to described 1 described liquid droplet ejection apparatus, it is characterized in that, the pulse width of described first pulse be 0.7AL above, below the 1.3AL, the ratio of the pulse width PWon of described first pulse and the pulse width PWoff of described second pulse is 0.45≤| PWon/PWoff|≤0.55.
3. the driving method of a liquid droplet ejection apparatus is characterized in that, described liquid droplet ejection apparatus comprises:
Record head, it has a plurality of nozzles that spray ink droplet, many passages that are set up in parallel that are communicated with described nozzle respectively, is made of and thereby detrusion makes the volume-variation of described passage make ink in this passage from the actuator of described nozzle ejection owing to drive applying of signal the next door, and described next door is had by adjacent described passage and is made of piezoelectric;
Drive signal generating apparatus, it generates described driving signal, and described driving signal comprises for a plurality of driving pulses that drive described actuator,
Will across one or more described passage and the described passage that is separated from each other is classified as one group, whole described passages are divided into plural group, applying described driving signal by each group, and the mode that the ink injection action is carried out in timesharing successively drives the described record head of control
The viscosity less than 5.0 * 10 of described ink
-3Pasec,
Described driving signal comprises first pulse and second pulse, described first pulse is made of the cubical expansion that makes described passage and the square wave that reverts to former volume behind certain hour, described second pulse is shunk by the volume that makes described passage and the square wave that reverts to former volume behind certain hour constitutes
The ratio of the voltage Von of first pulse and the voltage Voff of second pulse is 0.5≤| Von/Voff|≤0.8.
4. according to the driving method of described 3 described liquid droplet ejection apparatus, it is characterized in that, the pulse width of described first pulse be 0.7AL above, below the 1.3AL, the ratio of the pulse width PWon of described first pulse and the pulse width PWoff of described second pulse is 0.45≤| PWon/PWoff|≤0.55.
The effect of invention
According to the present invention, the driving method of a kind of liquid droplet ejection apparatus and liquid droplet ejection apparatus can be provided, its adopting low viscosity inks to utilize timesharing to drive from the next door that adjacency channel is common as actuator and the shear mode-type record head of detrusion carries out ink droplet when spraying, the vibration of the meniscus by making the adjacent non-injection nozzle of the nozzle that sprays is stable, can carry out stable ink droplet from record head and spray.
Description of drawings
Fig. 1 is that expression is as the figure of the brief configuration of the ink-jet recording apparatus of the application examples of liquid droplet ejection apparatus of the present invention.
Fig. 2 is the figure of an example of the expression record head that constitutes liquid droplet ejection apparatus of the present invention, and Fig. 2 (a) is the stereogram of representing outward appearance with the cross section, and Fig. 2 (b) is the cutaway view that arrives from the side.
Fig. 3 is the figure of an example of expression driving signal of the present invention.
Fig. 4 (a) and (b), (c) are the figure of the action of declare record head when ink sprays.
Fig. 5 (a) and (b), (c) are the figure that explanation three circulations drive.
The sequential chart of the driving signal when Fig. 6 is three circulation drivings.
The sequential chart of the driving signal when Fig. 7 is three circulation drivings.
Fig. 8 is illustrated in to make | the chart of the meniscus extrusion capacity when three circulations drive (every a channels drive) under the different situation of Von/Voff|.
Fig. 9 is illustrated in the chart that makes the meniscus extrusion capacity when three circulations drive (every a channels drive) under the different situation of ink viscosity.
Description of reference numerals
1: ink-jet recording apparatus
2: conveying mechanism
21: conveying roller
22: conveying roller is right
23: carry motor
3: record head
30: channel substrate
31,31A, 31B, 31C: passage
32,32A, 32B, 32C, 32D: next door
32a: upper wall portions
32b: lower wall portion
33: the lid substrate
33a: common stream
34: nozzle plate
34a: nozzle
35: plate
35a: ink supply port
35b: ink supply conduit
36A, 36B, 36C: drive electrode
4: guide rail
5: balladeur train
6: flexible cable
10: recording medium
10a: recording surface
100: drive the signal generating unit
Pa: first pulse
Pb: second pulse
Specific embodiment
Below, utilize the description of drawings embodiments of the invention.
Fig. 1 is that expression is as the figure of the brief configuration of the ink-jet recording apparatus of the application examples of liquid droplet ejection apparatus of the present invention.
In ink-jet recording apparatus 1, recording medium 10 is transferred the conveying roller of mechanism 2 to 22 clampings, and utilizes the conveying roller 21 that is driven by 23 rotations of conveying motor to be transferred towards diagram Y-direction (sub scanning direction).
Be accompanied by balladeur train 5 along the movement of main scanning direction, towards the recording surface 10a of diagram X-X ' direction movable recording media 10, record head 3 is by recording desirable ink jet image from the nozzle ejection ink droplet in this moving process.
Fig. 2 is the figure of an example of the expression record head 3 that constitutes liquid droplet ejection apparatus of the present invention, and Fig. 2 (a) is the stereogram of representing outward appearance with the cross section, and Fig. 2 (b) is the cutaway view that arrives from the side.
In record head 3, Reference numeral 30 is channel substrates.Many passages 31 and the next door 32 of narrow groove shape are set up in parallel in an alternating manner in channel substrate 30.The lid substrate 33 with the mode of blocking all passage 31 tops be located at channel substrate 30 above.Nozzle plate 34 and the end joined of channel substrate 30 with lid substrate 33, and utilize the surface of this nozzle plate 34 to form nozzle face.One end of each passage 31 is via the nozzle 34a and the external communications that are formed on this nozzle plate 34.
The other end of each passage 31 becomes shallow slot gradually with respect to channel substrate 30, and is formed on opening and covers on the substrate 33 and be communicated with the common common stream 33a of each passage 31.Common stream 33a is also blocked by plate 35, and ink is fed in common stream 33a and each passage 31 from ink supply conduit 35b via the ink supply port 35a that is formed on this plate 35.
Each next door 32 is made of the PZT piezoelectrics such as (piezoelectric ceramics) as the electricapparatus conversion equipment, and works as actuator of the present invention.Here, upper wall portions 32a and lower wall portion 32b are formed by the piezoelectric of handling through polarization, and example the rightabout towards each other example of polarised direction (utilizing the arrow among Fig. 2 (b) to represent) of this upper wall portions 32a and lower wall portion 32b.Yet the part that is formed by the piezoelectric of handling through polarization can only be the part of symbol 32a for example, so long as at least a portion in next door 32 gets final product.Next door 32 alternately is set up in parallel with passage 31.Therefore, a next door 32 is shared by the adjacent passage 31 in its both sides, 31.
Be formed with respectively in each passage 31 from the wall in two next doors 32 drive electrode (not shown Fig. 2) across passage 31 bottom surfaces.If the driving signal of assigned voltage is applied to two drive electrodes that clip next door 32 from the driving signal generating unit 100 that is located at the aftermentioned drive circuit respectively, next door 32 is border detrusion with the composition surface between upper wall portions 32a and the lower wall portion 32b just.Utilize the detrusion in this next door 32 to make volume-variation in the passage 31, thereby produce pressure wave, and the inks in this passage 31 apply the pressure that sprays for from nozzle 34a.Therefore, this record head 3 is that a kind of inside of the passage 31 that is surrounded by channel substrate 30, lid substrate 33, nozzle plate 34 constitutes pressure generating chamber, the shear mode-type record head of the ink of the detrusion that utilizes next door 32 in the nozzle 34a injection channel 31.
In the present invention, the ink in the passage 31 of record head 3 is viscosity less than 5.0 * 10
-3The low viscosity inks of pasec.The viscosity of ink is often referred to the viscosity under the normal temperature (25 ° of C), yet there is temperature dependency in the viscosity of known ink, also exists according to circumstances at ink-feeding device or record head 3 not shown heating apparatus to be set and to reduce the situation that viscosity is used with the temperature of rising ink.In this case, the viscosity of ink refers to, to the viscosity of heating and measuring under its design temperature for the ink that sprays.
Be located to generate via flexible cable 6 and driving signal generating unit 100 on the drive circuit that record head 3 is electrically connected and drive signals, this drivings signal comprises a plurality of driving pulses for the injection ink droplet.
An example representing the driving signal that the present invention adopts at Fig. 3.
Driving signal shown in this figure comprises in drive cycle T: by positive voltage (the first pulse Pa that+Von) square wave constitutes, it makes the cubical expansion of passage and revert to former volume behind certain hour; (Voff) the second pulse Pb of square wave formation, it shrinks the volume of passage and revert to former volume behind certain hour by negative voltage.
In addition, utilize the certain hour of AL (Acoustic Length: sound is long) expression as the duration of the cubical expansion that makes passage or contraction.AL refers to, 1/2 of the sound resonance cycle of the pressure wave of passage.In the speed of measuring the ink droplet that sprays when driving pulse with square wave is applied to drive electrode, and the magnitude of voltage that makes square wave is certain and when making the pulse width variation of square wave, the speed of circling in the air with ink droplet becomes maximum pulse width as AL, thereby tries to achieve AL.
In addition, pulse refers to, the square wave of certain voltage wave height value is being 0% with 0V and is being that pulse width is defined as under 100% the situation with wave height value voltage, voltage from 0V rise 10% with from the time between the wave height value voltage decline 10%.
And square wave refers to, voltage 10% and 90% between rise time, fall time all AL 1/2 with interior, preferred 1/4 with interior waveform.
Particularly, in the record head 3 of shear mode-type, owing to utilize the resonance of the pressure wave that produces in the passage 31 to spray ink droplet from nozzle 34a, so can utilize square wave more effectively to spray ink droplet.
In addition, because meniscus is rapid to the driving signal response that is made of square wave that applies, the record head 3 of shear mode-type can suppress driving voltage lower.In general, no matter spray still and do not spray, record head 3 is applied in voltage all the time, so low driving voltage is for the heating that suppresses record head and that ink droplet is stably sprayed is very important.
And, because square wave can utilize simple digital circuit easily to generate, so compare with the situation that employing has a trapezoidal wave of inclination ripple, have the advantage that the circuit structure also can be oversimplified.
Then, utilize Fig. 4 that ink-jet action under the situation that adopts drive record head 3 shown in Figure 3 is described.Fig. 4 represent along and the direction of the length direction quadrature of passage 31 cut off the part in the cross section of record head 3.
Fig. 4 represents adjacent three passages (31A, 31B, 31C) as the part of many passages 31.One end of passage 31 is communicated with nozzle 34a on being formed on nozzle plate shown in Figure 2 34, and the other end is via ink supply port 35a, jar is communicated with by ink barrel 35b and not shown China ink.Drive electrode 36A, 36B, the 36C that connects across the bottom surfaces in the passage 31 is close on the surface that is formed on the next door 32 in each passage 31.Each drive electrode 36A, 36B, 36C are electrically connected with driving signal generating unit 100.
Being close to the lip- deep drive electrode 36A, 36B, the 36C that are formed on each next door 32A, 32B, 32C, 32D by 100 pairs of driving signal generating units controls, when applying driving signal shown in Figure 3, utilize following illustrative action, spray ink droplet from nozzle 34a.
At first, any one in drive electrode 36A, 36B, 36C is not applied in when driving signal, and next door 32A, 32B, 32C, 32D are indeformable.Under the state shown in Fig. 4 (a), when drive electrode 36A and 36C ground connection and driving signal shown in Figure 3 are applied on the drive electrode 36B, utilize the first pulse Pa to produce electric field with the polarised direction vertical direction of the piezoelectric that constitutes next door 32B, 32C.Thus, with each next door 32B, 32C, produce detrusion on the composition surface of each upper wall portions 32a and lower wall portion 32b, shown in Fig. 4 (b), next door 32B, the 32C outside towards each other are out of shape, and make the cubical expansion of passage 31B.Thus, in passage 31B, produce negative pressure, thereby make ink flow into (being inhaled into).
Because the every 1AL of pressure in the passage 31B just reverses once, so when this state kept 1AL, the pressure in the passage 31B was reversed to malleation.At this moment, when drive electrode 36B was grounded, next door 32B, 32C turned back to the neutral position shown in Fig. 4 (a) from the expanding position shown in Fig. 4 (b), and high pressure acts on the ink (discharge) in the passage 31B.
Then, if apply the second pulse Pb to drive electrode 36B in the compartment of terrain continuously and not from this first pulse Pa decline, then shown in Fig. 4 (c), the direction that next door 32B, 32C are opposite towards each other is out of shape, thereby the volume of passage 32B is shunk.Because this second pulse Pb is after the applying of the first pulse Pa, pressure in passage 31B is applied in when being reversed to malleation, so become the form superimposed with shunk the positive pressure wave that produces by the volume of passage 32B, the expulsion pressure of ink droplet (jet velocity) improves, and obtains the most effective jet power.Thus, driving voltage can be reduced, thereby consumption electric power can be reduced.
In the above description, the pulse width PWon of the first pulse Pa is 1AL.Yet the pulse width PWon of the first pulse Pa of the present invention is as long as be in the scope more than the 0.7AL, below the 1.3AL near 1AL.In addition, the ratio (PWon/PWoff) of PWon and PWoff 0.45≤| under the situation of PWon/PWoff|≤0.55, can stablize the meniscus after spraying effectively.
For the record head 3 that has many passages of next door 32 that at least a portion utilized is made of piezoelectric separating 31 like this, owing to share next door 32 at adjacent passage 31, so when carrying out injection action in the next door 32 of a passage 31, the passage 31 that is adjacent can be influenced by it.Therefore, usually with in many passages 31, be one group with the passage 31 that is separated from each other across one or more passage 31, all passages 31 are divided into group more than two, drive control by applying the driving signal from driving signal generating unit 100 by group, thereby ink ejection action is carried out in timesharing successively.Particularly, all be actuated to export under the situation of solid-state image at all passages 31, carry out every two passes selector channel 31 and the what is called three circulation driving methods of dividing three-phase to spray.
Utilize Fig. 5 to further specify this three circulation and drive the injection action of carrying out.In example shown in Figure 5, constituted to describe by passage A1, B1, C1, A2, B2, C2, A3, B3, nine passages 31 of C3 with record head.Here, diagram is omitted nozzle.In addition, the sequential chart of the driving signal that expression applies for driving A, B, C respectively organize passage 31 at this moment in Fig. 6.
At first, when the drive electrode ground connection of the drive electrode of each passage that driving signal shown in Figure 3 is applied to A group (A1, A2, A3) and passage that its both sides are adjacent, only should spray the two next doors detrusion as shown in Figure 4 of the A group passage of ink droplet, ink droplet sprays (A circulation) from A organizes the nozzle of each passage 31.
Then, when the drive electrode ground connection of the drive electrode that driving signal shown in Figure 3 is applied to B group (B1, B2, B3) each passage and passage that its both sides are adjacent, only should spray the two next doors detrusion as shown in Figure 4 of the B group passage of ink droplet, ink droplet sprays (B circulation) from B organizes the nozzle of each passage.
And, when the drive electrode ground connection of the drive electrode that driving signal shown in Figure 3 is applied to C group (C1, C2, C3) each passage and passage that its both sides are adjacent, only should spray the two next doors detrusion as shown in Figure 4 of the C group passage of ink droplet, ink droplet sprays (C circulation) from C organizes the nozzle of each passage.
More than explanation is under the situation of for example printed solid image, and ink droplet is from the example of all passages 31 injections of each group.Yet, according to printed data, when A group drives, also exist A2 passage among Fig. 5 (a) for example to become the situation of non-injection channel, when each passage 31 of the adjacent C1 in its both sides, B2 was injection channel, the increase of the meniscus extrusion capacity in the nozzle of this A2 passage 31 became problem.
The distortion in the next door 32 of this shear mode-type record head 3 is owing to be applied to and clip these 32 ground, next door to be located at the voltage difference of drive electrode of these 32 both sides, next door caused.Therefore, under the situation of using driving signal shown in Figure 3, replacement will become negative voltage, and (second pulse Pb Voff) is applied to the drive electrode in the passage 31 that carries out the ink droplet injection, but as shown in Figure 7, make the drive electrode ground connection in the passage 31 that carries out the ink droplet injection, (+Voff) pulse is applied to the drive electrode in the adjacent passage 31 in the both sides of carrying out the ink droplet injection channel, thereby the next door is similarly moved as positive voltage with the second pulse Pb.
For example, A is being organized passage 31 under the situation of injection channel, with the first pulse Pa (+Von) be applied to A and organize drive electrode in each passage 31 after, the time that this first pulse Pa descends can be right after, A is organized drive electrode ground connection in the passage 31, simultaneously with the second pulse Pb (+Voff) be applied to respectively with A group passage 31 and share the adjacent B group in the both sides in next doors, the drive electrode in the C group passage 31.According to this method, owing to can utilize positive voltage to drive, so be optimal way.
In the present invention, importantly the ratio (Von/Voff) of the voltage Von of the first pulse Pa and the voltage Voff of the second pulse Pb to satisfy 0.5≤| the relation of Von/Voff|≤0.8.
By making like this | Von/Voff| is below 0.8, and meniscus reduces with respect to the extrusion capacity of nozzle, can reduce the risk that is involved in air.Its reason is considered to, and reduces because spray the drawing in relatively of driving passage of ink droplet, so owing to draw in the meniscus extrusion capacity minimizing of the adjacency channel that causes.
Fig. 8 is to be 3.8 * 10 using viscosity
-3When the ink of pasec carried out three circulation drivings (every a channels drive), the specific non-driving passage that is conceived in the A group represented that the time of its meniscus extrusion capacity changes.Here also the situation with Fig. 9 is the same, and being conceived to the even-numbered channels in each passage is to carry out the injection channel of ink injection and order (A circulation → B circulation → C circulation) the specific non-driving passage of organizing according to A group → B group → C (odd chanel) that A organizes when driving.Consequently, when even-numbered channels (even number ch) jet drive of adjacent B group, with | the situation of Von/Voff|=2 is compared, | the meniscus extrusion capacity under the situation of Von/Voff|=0.67 reduces.
In addition, by making | Von/Voff| is more than 0.5, can reduce owing to drive efficient and reduce heating or the IC load that causes.
Embodiment
Below, utilize embodiment to prove effect of the present invention.
In shear mode-type record head shown in Figure 2, to using following two kinds of inks, and change driving signal shown in Figure 3 first pulse voltage Von and the voltage Voff of second pulse ratio (| the stabilized speed upper limit and satellite ink droplet (サ テ ラ イ ト) the generating capacity evaluation of splashing when Von/Voff|) carrying out three circulations and drive.
In addition, record head has 256 nozzles, and nozzle diameter is 30 μ m, AL=5.6 μ s, drive the pulse width PWon=5.6 μ s (1AL) of first pulse of signal, the pulse width PWoff=11.2 μ s (2AL) of second pulse, drive cycle T are 28 μ s (5AL).
The stabilized speed upper limit refers to, | in each voltage ratio of Von/Voff|, do not change | Von/Voff| and voltage is risen and the speed of circling in the air is increased, the speed (m/s) of circling in the air of the maximum that can spray being involved in air from nozzle before can not spraying ink droplet.This stabilized speed upper limit is to measure the speed of circling in the air by drive pattern (switch and drive), and adopt in both sides estimate than the speed of hanging down a side, this drive pattern (switch and drive) refers to, press certain hour (1 second) and switch except common full tunnel drives, only even-numbered passage (2 (B circulation canals), 4 (A circulation canals), 6 (C circulation canals), 8 (B circulation canals) ...) driving and odd-numbered passage (1 (A circulation canal), 3 (C circulation canals), 5 (B circulation canals), 7 (A circulation canals) only ...) the drive pattern of driving.
In addition, the value of the stabilized speed upper limit is more big, and the velocity interval of circling in the air of ink droplet is more wide, so the value of the preferred stabilized speed upper limit is big.Can cause tangible image quality deterioration because spray disappearance, so preferably have the difference about 1.5m/s at least between the actual speed of utilizing and the stabilized speed upper limit.Here, represented to suppose that spraying ink droplet with the speed of circling in the air of 6m/s records and form image, be then can not use (the present invention) more than the 7.5m/s as long as stabilized speed is reached the standard grade with having problems.
The evaluation of satellite ink droplet generating capacity is carried out as followsly, and, with the ink droplet speed of circling in the air of 6m/s ink droplet is ejected on the record-paper, and asks 10 people's Visual Confirmations to describe to comprise evaluation that above-mentioned switching drives with the image quality of image.
Below represent its metewand.
Few: 10 philtrums, 0～1 people judges that the satellite drop flight is remarkable
In: 10 philtrums, 2～4 people judge that the satellite drop flight is remarkable
Many: 10 philtrums, 5 people are above to judge that the satellite drop flight is remarkable
＜ink kind＞
Ink 1: viscosity 3.8 * 10
-3Pasec
Surface tension: 38 * 10
-3Nm
-1
Ink 2: viscosity 4.3 * 10
-3Pasec
Surface tension: 56 * 10
-3Nm
-1
The measurement result under the situation of ink 1 is used in expression in table 1, and the measurement result under the situation of ink 2 has been used in expression in table 2.
[table 1]
Ink 1
| ? | Von/Voff | The stabilized speed upper limit (m/s) | Satellite ink droplet generating capacity |
| Comparative example 1 | 0.4 | 7.3 | In |
| Embodiment 1 | 0.5 | 8.2 | |
| Embodiment | |||
| 2 | 0.67 | 7.7 | |
| Embodiment | |||
| 3 | 0.8 | 7.6 | Few |
| Comparative example 2 | 1.4 | 6.4 | Few |
| Comparative example 3 | 2 | 6.2 | Few |
[table 2] ink 2
| ? | Von/Voff | The stabilized speed upper limit (m/s) | Satellite ink droplet generating capacity |
| Comparative example 4 | 0.4 | 8 | |
| Embodiment | |||
| 4 | 0.5 | 9.4 | In |
| |
0.67 | 9.7 | |
| Embodiment | |||
| 6 | 0.8 | 8.8 | Few |
| Comparative example 5 | 1.4 | 7.3 | Few |
| Comparative example 6 | 2 | 7.3 | Few |
From table 1,2 as can be known, any one in the ink 1,2 0.5≤| can both obtain more than the stabilized speed upper limit 7.5m/s and the few preferred result of satellite ink droplet generating capacity in the scope of Von/Voff|≤0.8 (embodiment 1～6).
| the value of Von/Voff| greater than 0.8 comparative example 2,3,5,6 in, the stabilized speed upper limit is lower.This is because meniscus oscillations is bigger, so if increase liquid drop speed when switching driving, disappearance takes place then to spray.
On the other hand, shown in comparative example 1,4, | the value less than 0.5 of Von/Voff|, the stabilized speed upper limit also reduces.This be because | Von/Voff| is more low, suck as the ink of first pulse of expansion pulse just more little, so drive decrease in efficiency.That is to say that reduce if drive efficient, then high velocity jet needs more voltage, but the stabilized speed upper limit is because the problem of the rated value of drive IC and heating and restricted.This problem exists | takes place significantly during the value less than 0.5 of Von/Voff|.
In addition, if | the value less than 0.5 of Von/Voff|, then satellite ink droplet generating capacity ink 1,2 any one in all increase.If reduce | the value of Von/Voff|, then pulse voltage Voff increases relatively.The counteracting that this means pressure wave increases.Therefore, the compression shock when ink droplet separates increases, and satellite ink droplet generating capacity increases.
By above result as can be known, 0.5≤| in the scope of Von/Voff|≤0.8, can obtain the preferred inks characteristic of circling in the air.| during Von/Voff|=0.67, obtain the particularly preferred ink droplet characteristic of circling in the air.
(reference example)
As a reference, adopt record head and the driving method identical with above record head, use following ink 3,4, with above-mentioned mensuration of similarly carrying out the stabilized speed upper limit.Its measurement result is illustrated in the table 3.
Ink 3: viscosity 5.7 * 10
-3Pasec, surface tension: 41 * 10
-3Nm
-1
Ink 4: viscosity 7.2 * 10
-3Pasec, surface tension: 39 * 10
-3Nm
-1
[table 3]
In ink 3,4, because the viscosity height, so the remarkable instability that can not switch and drive.Therefore, regardless of | the value of Von/Voff|, the stabilized speed upper limit is all almost identical
Injection instabilityization when thus, switching driving is in ink viscosity less than 5.0 * 10
-3Remarkable during pasec, for head it off, effectively way be ratio with the voltage Von of first pulse and the voltage Voff of second pulse be set at 0.5≤| Von/Voff|≤0.8.
Claims (4)
1. a liquid droplet ejection apparatus is characterized in that, comprising:
Record head, it has a plurality of nozzles that spray ink droplet, many passages that are set up in parallel that are communicated with described nozzle respectively, is made of and thereby detrusion makes the volume-variation of described passage make ink in this passage from the actuator of described nozzle ejection owing to drive applying of signal the next door, and described next door is had by adjacent described passage and is made of piezoelectric;
Drive signal generating apparatus, it generates described driving signal, and described driving signal comprises for a plurality of driving pulses that drive described actuator,
Will across one or more described passage and the described passage that is separated from each other is classified as one group, whole described passages are divided into plural group, applying described driving signal by each group, and the mode that the ink injection action is carried out in timesharing successively drives the described record head of control
The viscosity less than 5.0 * 10 of described ink
-3Pasec,
Described driving signal comprises first pulse and second pulse, described first pulse is made of the cubical expansion that makes described passage and the square wave that reverts to former volume behind certain hour, described second pulse is shunk by the volume that makes described passage and the square wave that reverts to former volume behind certain hour constitutes
The ratio of the voltage Von of described first pulse and the voltage Voff of described second pulse is 0.5≤| Von/Voff|≤0.8.
2. liquid droplet ejection apparatus according to claim 1, it is characterized in that, the pulse width of described first pulse be 0.7AL above, below the 1.3AL, the ratio of the pulse width PWon of described first pulse and the pulse width PWoff of described second pulse is 0.45≤| PWon/PWoff|≤0.55.
3. the driving method of a liquid droplet ejection apparatus is characterized in that, described liquid droplet ejection apparatus comprises:
Record head, it has a plurality of nozzles that spray ink droplet, many passages that are set up in parallel that are communicated with described nozzle respectively, is made of and thereby detrusion makes the volume-variation of described passage make ink in this passage from the actuator of described nozzle ejection owing to drive applying of signal the next door, and described next door is had by adjacent described passage and is made of piezoelectric;
Drive signal generating apparatus, it generates described driving signal, and described driving signal comprises for a plurality of driving pulses that drive described actuator,
Will across one or more described passage and the described passage that is separated from each other is classified as one group, whole described passages are divided into plural group, applying described driving signal by each group, and the mode that the ink injection action is carried out in timesharing successively drives the described record head of control
The viscosity less than 5.0 * 10 of described ink
-3Pasec,
Described driving signal comprises first pulse and second pulse, described first pulse is made of the cubical expansion that makes described passage and the square wave that reverts to former volume behind certain hour, described second pulse is shunk by the volume that makes described passage and the square wave that reverts to former volume behind certain hour constitutes
The ratio of the voltage Von of first pulse and the voltage Voff of second pulse is 0.5≤| Von/Voff|≤0.8.
4. the driving method of liquid droplet ejection apparatus according to claim 3, it is characterized in that, the pulse width of described first pulse be 0.7AL above, below the 1.3AL, the ratio of the pulse width PWon of described first pulse and the pulse width PWoff of described second pulse is 0.45≤| PWon/PWoff|≤0.55.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP2011286948A JP5867072B2 (en) | 2011-12-27 | 2011-12-27 | Droplet ejection device and method for driving droplet ejection device |
| JP2011-286948 | 2011-12-27 |
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| CN103182842A true CN103182842A (en) | 2013-07-03 |
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| EP (1) | EP2610060B1 (en) |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106240159A (en) * | 2016-08-05 | 2016-12-21 | 武汉理工大学 | A kind of predrive method accurately processing the first drop in ink-jet printing technology |
| CN106457823A (en) * | 2014-03-31 | 2017-02-22 | 柯尼卡美能达株式会社 | Inkjet head driving method and inkjet printing apparatus |
| CN106457824A (en) * | 2014-03-31 | 2017-02-22 | 柯尼卡美能达株式会社 | Inkjet head driving method and inkjet printing apparatus |
| CN107107614A (en) * | 2014-12-26 | 2017-08-29 | 柯尼卡美能达株式会社 | The driving method and droplet discharge apparatus of drop discharge head |
| CN107215098A (en) * | 2016-03-22 | 2017-09-29 | 精工电子打印科技有限公司 | Jet head liquid |
| CN107443904A (en) * | 2016-05-31 | 2017-12-08 | 东芝泰格有限公司 | Ink gun and ink-jet printer |
| CN107835748A (en) * | 2015-07-13 | 2018-03-23 | 扬·弗兰克 | Method for controlling an inkjet printhead |
| CN108528049A (en) * | 2017-03-06 | 2018-09-14 | 精工爱普生株式会社 | The control method and liquid injection apparatus of liquid injection apparatus |
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| US6412927B1 (en) * | 1997-04-30 | 2002-07-02 | Brother Kogyo Kabushiki Kaisha | Ink ejection device for forming high density dot image by successively ejecting two or more ink droplets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106457823A (en) * | 2014-03-31 | 2017-02-22 | 柯尼卡美能达株式会社 | Inkjet head driving method and inkjet printing apparatus |
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| CN107107614A (en) * | 2014-12-26 | 2017-08-29 | 柯尼卡美能达株式会社 | The driving method and droplet discharge apparatus of drop discharge head |
| CN107107614B (en) * | 2014-12-26 | 2020-01-21 | 柯尼卡美能达株式会社 | Method of driving droplet discharge head and droplet discharge apparatus |
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| CN107215098A (en) * | 2016-03-22 | 2017-09-29 | 精工电子打印科技有限公司 | Jet head liquid |
| CN107443904A (en) * | 2016-05-31 | 2017-12-08 | 东芝泰格有限公司 | Ink gun and ink-jet printer |
| CN106240159A (en) * | 2016-08-05 | 2016-12-21 | 武汉理工大学 | A kind of predrive method accurately processing the first drop in ink-jet printing technology |
| CN108528049A (en) * | 2017-03-06 | 2018-09-14 | 精工爱普生株式会社 | The control method and liquid injection apparatus of liquid injection apparatus |
| CN108528049B (en) * | 2017-03-06 | 2019-11-22 | 精工爱普生株式会社 | Control method of liquid ejecting device and liquid ejecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5867072B2 (en) | 2016-02-24 |
| EP2610060A1 (en) | 2013-07-03 |
| JP2013132900A (en) | 2013-07-08 |
| CN103182842B (en) | 2015-11-25 |
| EP2610060B1 (en) | 2015-03-25 |
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