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CN102574395A - Multi-channel print or metering head - Google Patents

Multi-channel print or metering head Download PDF

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Publication number
CN102574395A
CN102574395A CN2010800364224A CN201080036422A CN102574395A CN 102574395 A CN102574395 A CN 102574395A CN 2010800364224 A CN2010800364224 A CN 2010800364224A CN 201080036422 A CN201080036422 A CN 201080036422A CN 102574395 A CN102574395 A CN 102574395A
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China
Prior art keywords
fluid
pneumatic
valve
printhead
barrier film
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Granted
Application number
CN2010800364224A
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Chinese (zh)
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CN102574395B (en
Inventor
贝克哈德·巴斯特金斯
苏荷·乔戈斯
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Exel Industries Inc
Homer Machinery Manufacturing Co ltd
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Individual
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14483—Separated pressure chamber
    • 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
    • B41J2202/05—Heads having a valve

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  • Micromachines (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Coating Apparatus (AREA)

Abstract

A printhead, particularly suitable for viscous or particulate-filled fluids, has multiple channels. One path of the printhead is characterized by comprising: a micro-electro-pneumatic circuit (2) comprising a series circuit of a micro-valve (18) and a pneumatic throttle (23) between a first and a second pressure level for generating a control pressure p at a common pneumatic node (5) of the micro-valve (18) and the pneumatic throttle (23)cFurther comprising a drop-on-demand fluid ejector (4) having a pressure controlled by said control pressure pcA driven diaphragm (8), the flowThe body injector (4) controls the discharge of fluid through the fluid outlet (6).

Description

Multi-path printhead or metering head
Technical field
According to the preamble of claim 1, the present invention relates to print or printhead, be used for printing, dispense liquid on surface or three-dimensional structure, be called for short hereinafter and print.Particularly, the present invention relates to use the printing of printhead, distributor or other similar device, these devices are called printhead hereinafter, and it has a plurality of fluid issuings 6, and these fluid issuings 6 are how much pattern arrangements of going up rule, preferably by rows.The invention still further relates to the printing or the distribution of fluid; Wherein the volume range of fluid is that per injection (per shot) is received and upgraded to milliliter level; Fluid has medium-viscosity (up to 1Pas); Said fluid also can comprise concentration, and (grain size: 0.3mm), speed is up to kHz, and pitch is low to moderate millimeter up to 90% particle.The present invention is specifically related to use mobile device to print, and said mobile device should be low weight, under the acceleration situation, with trouble free service, and does not reveal.
Background technology
Current ink jet-print head is suitable for the discharging frequency, and it is mainly worked according to displacement of fluid principle (fluid displacement principle).Its use is limited to the fluid that viscosity is lower than 25mPas.Also can realize according to displacement of fluid principle work, the printhead that is used for the fluid of viscosity higher through using powerful piezoelectric pile formula driver (piezo stack actuators).Yet, can not realize pitch less than 4mm, lightweight, be suitable for handling the multi-path printhead that drop speed is the moderately viscous fluid of kHz scope.
Like US5, the printhead on the valve technology basis in 119,110 and US5,356,034 also is suitable for operating frequency.With compare according to the printhead of displacement of fluid principle work, they have the advantage that is provided for the required higher-energy of the discharging of viscous fluid through pressure source.Yet; Because higher fluid viscosity; Also need higher switching energy to be used to change said fluid stream, like electromagnetism (US5,356 of known valve technology type; 034) or piezoelectricity (US2009/0115816) printhead provided, thereby satisfy the requirement of the present invention about fluid property, pitch, drop frequency and drop weight.
The present invention utilizes the printhead of claim 1 to solve the foregoing invention problem.
In addition; The invention discloses and use that the printhead 1 with a plurality of electrically addressable paths prints, the method for metering or distributing fluids, each path uses little electro-pneumatic loop (micro-electro-pneumatic-circuit) that electric control signal is converted into to have the more pneumatic control pressure p of macro-energy c, the barrier film of this controlled pressure drive fluid injector, thus the fluid of realizing final displacement of fluid or valve opening part discharges.
The invention discloses the apparatus and method that print, distribute or measure a phase or heterogeneous fluid, emulsion or dispersion through printhead 1; Said fluid, emulsion or dispersion have or do not have solids content; The range of viscosities height is to 1Pas, and said printhead 1 has small size and low weight, and the fluid tip spacing is about 1/10th millimeters levels to millimeter level; Drop speed is up to the kHz scope, and variable drop size upgrades to micro updating from skin.
The invention discloses the apparatus and method that print, distribute or measure through the multi-path printhead, said printhead comprises little electro-pneumatic loop, is used to control one or more pneumatic fluid injectors.
The invention discloses the apparatus and method of printing, distributing or measure through the printhead 1 with a plurality of paths, it comprises little electro-pneumatic loop, contains the device that low-energy electric control signal is converted into the pneumatic control signal of higher-energy.
The invention also discloses the apparatus and method that electric control signal converted into pneumatic control signal; These apparatus and method make electricity consumption/gas transducer; Preferred magnetic or the piezoelectricity pneumatic operated valve of using, further preferred use miniature valve 18, and use other pneumatic element that fluid restricted is provided.
The invention also discloses and use printhead 1 printing with a plurality of paths, the apparatus and method of distributing or measuring, said apparatus and method comprise fluid ejector 4, and this injector 4 is according to displacement principle or valve principle (valve principle) operation.
The invention also discloses and use printhead 1 to print, distribute or the apparatus and method of metering, said apparatus and method comprise the structure that contains with the characteristic of multi-path injector same type.
The invention also discloses the apparatus and method of using printhead 1 to print, distribute or measure, said apparatus and method comprise the structure of the characteristic that contains the multi-path electric loop.
The invention also discloses and use printhead 1 printing with barrier film 8, the apparatus and method of distributing or measuring, said barrier film extends to one or more paths, and said pneumatic energy is passed to corresponding injector; Fill up or compress opening, thereby anti-fluid is perhaps discharged fluid through said opening; Thereby spray fluid through one or more corresponding fluid issuings, perhaps exhaust fluid is sprayed fluid through fluid issuing; Until said barrier film 8 and relevant fluid issuing contact; Close this outlet, thereby interrupt flowing of fluid suddenly, separate fluid discharged.
The invention also discloses and rely on new or different configurations, change the apparatus and method of fluid conveying part rapidly.
The invention also discloses the apparatus and method that are used for integrated said control electronic device, said control electronic device is used in particular for pneumatic electricity/gas transducer, with the said control electronic device of air purge, thereby from said control electronic device, gets rid of heat.
Industrial applicibility
But use printhead dosage of the present invention or print the multiple fluid in the multiple application.Within the scope of the invention, fluid is called liquid, and this liquid can flow freely or in the pressure current downflow, contain a phase or heterogeneous, and have viscosity profile, and part comprises the value that is lower than 1Pas at least in its viscosity-shear stress indicatrix.Concrete, can handle fluid with thixotropy or the thinning performance of shear force.Heterogeneous fluid can be the fluid that has soluble particle, fluid drop or embed the bubble in the fluid.Enumerate the example and the purposes of only having specified accessible fluid below: the liquid polymers of the aqueous solution, prepared Chinese ink, pigment (printing of wall finiss, emulsion paint, coloring earth, artistic pigment), varnish, mortar (printing of mortar, plaster), liquid polymers, ultraviolet-curing (for example: rapid prototyping), printing wax, adhesive and resin, filling or unfilled, grease, oil; The printing of various fluids all can be used for the printing technique field in principle, for example the reagent or the component of fluid, medical science or the biomedicine of prepared Chinese ink, pigment, partial cross-linked liquid, high-viscosity material or body fluid (blood, saliva), making food or biological field, be included in use before, use in or use the printing that the back produces the liquid of foam.Also can fluid be interpreted as gas, can under high power capacity and high-frequency, measure through device of the present invention or method.
Preferable use according to the printhead of the present invention of claim 1 is as the printhead of printing particulate load liquid, the scope of the particle diameter that said particle has up to 1/10th millimeters.Preferably, printhead of the present invention can particularly preferably, use the hand held printer of light-duty, powerful printhead through printing wall finiss or emulsion paint painting on the metope or on metope, drawing.Perhaps with printing slurry (for example conductibility, insulating properties or resistive slurry) or slurry (glass paste or other) or food on the thick membrane technology.
Another preferable use of printhead of the present invention for example is used for speed forming method or is used to print Braille for making three-dimensional structure.
Description of drawings
With reference to accompanying drawing, hereinafter will describe the different typical embodiment of apparatus and method of the present invention in detail.
Fig. 1 has showed the apparatus and method that the present invention uses printhead 1 to print, distribute or measure.
Fig. 2 has showed the apparatus and method that the present invention uses printhead 1 to print, distribute or measure in more detail.
Fig. 3 has showed the embodiment of little pneumatic circuit of the present invention.
Fig. 4 has showed the embodiment according to the injector of the present invention of valve principle operation.
Fig. 5 has showed the embodiment according to the injector of the present invention of displacement of fluid operation.
Fig. 6 has showed the embodiment according to the injector of the present invention of valve principle operation.
Fig. 7 has showed the preferred embodiment of printhead 1 of the present invention.
Fig. 8 has showed the preferred embodiment of the printhead of being made up of checker plate, and each checker plate comprises the structure of similar printhead path.
Fig. 9 has showed that the present invention is used to prevent the preferred embodiment of the device that fluid issuing is dry.
Figure 10 has showed the preferred embodiment of the printhead that the present invention is made up of checker plate.
The specific embodiment
Fig. 1 has showed the block diagram of the apparatus and method of the present invention of a path that is used for printhead.Term print head should be represented printhead, and printhead does not have clear and definite to be limited to these.Printhead is construed as a kind of device usually, is used for through path non-contiguously on the surface of any kind of continuously or coating fluid off and on, and said path is spaced apart regularly and be that electronics is independently controlled.According to terminology used here, path is the addressable unit of the minimum of electronic printable head 1.Path also can have a plurality of fluid issuings.Printhead also can comprise contactless fluid application, for example uses with irrelevant common metering and the fluid control of direct release of fluid.
Apparatus and method of the present invention change the low-energy electric control signal of each path into through little electro-pneumatic loop the pneumatic control signal (like Fig. 1) of higher-energy.Extra energy source is in one or more pressure source p 1, p 2, be called stress level hereinafter.Little electro-pneumatic loop 2 is interpreted as the network of little electrical pneumatic element.These can be, for example electricity/gas transducer, gas/mechanical transducer, pneumatic throttle, dead volume, pipe and chamber.
The said pneumatic control signal p of each path cBe used to drive at least one pneumatic fluid injector.Pneumatic fluid injector 4 is interpreted as a kind of device, and the pneumatic control pressure that is applied on the barrier film is made response, sprays fluid from one or more fluid issuings.Barrier film also can be represented other suitable air impeller, and is (rectangle, oval-shaped such as the fluid line of flexible board, the film that has suspension or plate, moveable piston, corrugated tube or inflatable part, flexible pipe or other shape of cross section ...).
Fig. 2 has at length showed said little electro-pneumatic loop of apparatus and method of the present invention and the pneumatic fluid injector of electronics addressable path n.
Little electro-pneumatic loop 2 comprises by being in the first stress level p 1With the second stress level p 2Between the series loop formed of first pneumatic element and second pneumatic element, said first pneumatic element is that miniature valve 18, the second pneumatic elements are choke valve 23, produces angry dynamic control signal or simple controlled pressure p at common pneumatic node 5 whereby c, the pneumatic barrier film that is connected at least one fluid ejector of this controlled pressure.
Should be noted that about the use of word " pneumatic " and can use any gas, or even hydraulic fluid replaces air as pressure reagent.Title among the present invention " little pneumatic " should not be regarded as using the restriction of air as pressure reagent.
Fluid ejector of the present invention is the part of printhead 1, and this fluid ejector is discharged fluid based on the drop-on-demand principle.This fluid ejector comprises at least one fluid intake and at least one fluid issuing.The pneumatic fluid injector is in pneumatic energy, is at controlled pressure p here cHelp to pass through down the fluid ejector of barrier film operation.
Printhead of the present invention can be according to the displacement of fluid principle work, and for example said injector 4 is by controlled pressure p cThe fluid displacement apparatus that drives.According to displacement principle, through reducing the volume in the chamber that fluid fills, the fluid the chamber in is transferred in the mechanically deform of barrier film or motion, thereby makes fluid pass through said fluid issuing 6 discharges.Printhead of the present invention also can be according to the valve principle work, and for example said injector is according to the valve principle work, and barrier film 8 serves as valve diaphragm.
The embodiment in the little electro-pneumatic loop that is used for single path has been described among Fig. 3.Each little electro-pneumatic loop comprises the pneumatic control pressure port that is positioned at the bottom, is provided for driving the controlled pressure p of said fluid ejector c
Said little electro-pneumatic loop comprises and is positioned at two stress level p 1And p 2Between pneumatic element Z 1With pneumatic element Z 2Series loop, in the chamber, pneumatic node 5 places that it is common produce the interim controlled pressure p comprise two states at least cThereby, operate said fluid ejector.In fact pressure source can be designed to pump, compressor or vavuum pump (Pabs < 1 bar).In literary composition of the present invention, the opening that leads to environment is interpreted as the pressure source (p=p with environmental pressure u).
According to the present invention, two pneumatic element Z 1Or Z 2In at least one comprise electricity/gas transducer, the for example pneumatic operated valve of electric control.This pneumatic operated valve can be according to the operation of any transducer principle, for example piezoelectric principle, electromagnetic principle, electropneumatic formula principle, electrostatic principle or electrostriction principle, and have short response time T 1 ms and little dead volume.Preferably according to the acting valve of piezoelectric principle, because the electric amplification in little electro-pneumatic loop, the size of this valve can be especially little." miniature valve " 18 so use a technical term usually hereinafter.
According to the present invention, said pneumatic element Z 1Or Z 2In at least one comprise miniature valve V 1, another is minitype pneumatic valve V 2Or pneumatic throttle 23.At latter event, said miniature valve V1 is a valve unique in each path.Pneumatic throttle is characterised in that their loss effect and linearity or non-linear flow dynamic resistance, and pressure is reduced.The example of pneumatic throttle is that capillary 23, hole, fluid change that direction changes or the change of cross section.It shall yet further be noted that pneumatic element Z 1Or Z 2Can be not only single pneumatic throttle or miniature valve 18, also can comprise these combination, even comprise pneumatic circuit.
According to the present invention, said injector 4 pneumatically is connected to Z 1And Z 2Between node 5, at these node 5 places,, set controlled pressure p on demand according to the valve position of said miniature valve 18 cTo control said fluid ejector.Pneumatic node 5 comprises pipeline and chamber, and said pipeline and chamber extend to said pneumatic element Z 1And Z 2Effective coverage and the pneumatic end of said fluid ejector, thereby have volume V kSwept volume-the volume V of injector EAlso add in the above-mentioned volume.Since the compressibility of air, said volume V K+ V EHas pneumatic adaptability.The speed that this state that has limited said controlled pressure changes.Learn volume V K+ V ESize, can calculate the time constant of conversion operations, the structurally associated (as follows) of itself and said little electro-pneumatic loop and said fluid ejector:
Figure 2010800364224100002DEST_PATH_IMAGE001
Wherein R depends on the conversion operations of being considered, equals at Z 1Or Z 2In the miniature valve 18 opened fluid resistance or equal the flow resistance of said pneumatic throttle 23.In order to realize that on injector 4 fluid breaks away from (clean fluid tear-off) completely, it be highly dynamic that the pressure of said controlled pressure changes.According to the present invention, the said loop element in little electro-pneumatic loop limits size in some way, thus said pneumatic control signal p cThe time constant that changes of state preferably in the scope of 1 microsecond to 1 millisecond, especially preferred in the scope of 1 microsecond to 100 microsecond.High operating frequency, low weight and undersized requirement need be used miniature valve 18, and on the other hand, miniature valve 18 only comprises the valve journey of about 0.05mm.As a result, the flow resistance of the said miniature valve of opening 18 has relevant progression, therefore according to formula (1), only works as volume V KAnd V EWhen microminiaturized, just can obtain enough little time constant.
In order to drive the pneumatic fluid injector effectively, a purpose is the height difference that makes the final pressure level of controlled pressure.Another purpose is to keep little with said pneumatic throttle specific air consumption through the said minitype pneumatic valve of opening 18.Two purposes all show the flow resistance R that will select pneumatic throttle 23 DApparently higher than the flow resistance Rv of the said miniature valve of opening, for example 10 times.Yet limiting, this size has shortcoming; Promptly after closing said miniature valve 18; Because the decline of the controlled pressure through said pneumatic throttle 23; It is big that time constant in the formula (1) becomes, and this (depends on the structure of said injector, be unfavorable for that as follows) fluid discharges completely or fluid breaks away from again.According to formula (1), remain and only work as volume V KAnd V EWhen reducing, realize the short response time.According to the present invention, the element in said minitype pneumatic loop is microminiaturized element and/or structure, especially when said volume V KAnd V EWhen microminiaturized.But microminiaturization is limited by the following fact, and promptly the flow resistance of Pneumatic pipe is compared in size with the flow resistance of for example pneumatic throttle and gone up mutually and can not ignore again.At this moment, should change discontinuous path, to help continuous mode, in discontinuous path, for example pneumatic throttle is used as discontinuous pneumatic element Z 2Therefore, according to the present invention, pneumatic element Z 1And Z 2Be not limited to discontinuous pneumatic element, and should regard the part of the device with pneumatic function as, for example pneumatic throttle works between geometric first and second, if pneumatic element Z 2, then be positioned at the point and the p that exerts pressure that set controlled pressure 2Point between work.
Embodiment as shown in Figure 3, said electrically driven (operated) miniature valve 18 is preferably the piezo electric valve with piezoelectric bending transducer.Each of these embodiment all comprises the piezoelectric bending transducer of single configuration, for example, is d 31The lamination PZT (piezoelectric transducer) of operator scheme; Its substrate is processed by the material of non-piezoelectricity, elongate shape; When to use voltage be said piezoelectric element charging, the end deflection that can move freely was perpendicular to the direction of said substrate side, and said piezoelectric element is positioned on the said substrate.Suitable monotype transducer has, and for example gross thickness is less than 0.5mm, and drift is 5-10mm, far below the width of 1mm.The free end of said piezoelectric actuator covers valve opening 9, is provided with sealing surface around this valve opening, is called valve seat here.Fig. 3, A and Fig. 3, the structure among the B comprises the first pneumatic impedance Z of described monotype piezoelectric micro valve 18 forms 1Second impedance Z with the capillary form 2
Below detailed consideration hypothesis is said has a p 1>p 2Two pressure sources supply said little electro-pneumatic loop.Therefore, said controlled pressure p cOnly can be at p 1And p 2Between value.Said piezoelectric micro valve 18 is positioned at the chamber, and this chamber depends on by pressure p 1Or p 2The operator scheme in said little electro-pneumatic loop of supply.Said capillary 23 links to each other with said miniature valve 18 and said controlled pressure port in a side, opposite side and remaining pressure source p 2Or p 1Link to each other.
Fig. 3, A have showed two kinds of operator schemes of little electro-pneumatic driver of the present invention, and wherein piezo electric valve is configured to normally closedly, and for example under non-Piezoelectric Driving condition, said valve is closed.At Fig. 3, in the operator scheme 1 of A, higher pressure p 1Be applied on the miniature valve 18.These miniature valve 18 closures, and produce the p of pressure decline completely 1-p 2So control output equals p c=p 2Open and produce when passing pressure said capillary 23, above-mentioned and descending, p when electricity drives said valve c=A * (p 1-p 2).So said miniature electric loop does not turn to behavior, promptly electric control voltage produces the increase of said controlled pressure.Fig. 3, the operator scheme 1 among the A is preferably used with the fluid ejector 4 according to the displacement of fluid principle work.
At Fig. 3, in the operator scheme 2 of A, said pressure source is put upside down, and further with the said piezo electric valve of certain mode prestrain, promptly firmly F is pressed in its free end on the valve seat, thereby only works as greater than the pressure p that defines thus gThe time, said valve just can be opened.When electricity drives said valve, miniature valve 18 and said pressure p gThe power F of acting in conjunction opposing prestrain is to open said valve.So under non-driven state, controlled pressure equals p c=p g, reduce near p in the driving condition downforce 2Therefore, said little electro-pneumatic loop shows the behavior that turns to.Fig. 3, the operator scheme 2 among the A is preferably used with the fluid ejector 4 according to the valve principle work, because under the non-driven state of electricity, for example the valve diaphragm 8 of said fluid valve is by pressure p g-p F1Press to said fluid bore.
Fig. 3, B have showed two kinds of operator schemes of little electro-pneumatic driver of the present invention, and wherein piezo electric valve is configured to normally open.Through Fig. 3, similar consideration among the A, we obtain following results:
Fig. 3, in the operator scheme 1 of B, said little electro-pneumatic loop has the behavior of turning to, and at Fig. 3, in the B operator scheme 2, little electro-pneumatic loop does not turn to behavior.Therefore, several kinds of possibilities with different injector combinations also are similar.
Fig. 3, the little electric loop shown in A and the B is characterised in that, in the open mode position of miniature valve 18, produces fixing specific air consumption, it is mainly confirmed by the flow resistance of said capillary 23.When limiting through size suitably, the microminiaturization through said capillary 23 especially, the low specific air consumption of scalable (throttling).Yet this means the pressure p on the said capillary 23 cThe corresponding time constant of the foundation of (depending on structure) or decline will become greatly, and the requirement of the sealing of said miniature valve 18 improves.The further common ground in said little electro-pneumatic loop does, common said miniature valve 18 contains a side of valve opening, and a side that promptly has less dead volume is connected to node 5, and (it connects Z 1And Z 2, and at this setting controlled pressure p c) connect.
Fig. 3, C have showed little electro-pneumatic loop 2, and it does not show fixing specific air consumption, comprise replacing said pneumatic throttle as Z 2Second miniature valve 18.If two miniature valve 18 configurations similar (opening normally or normal closure, not shown here), operate with two reciprocal modes of miniature valve in so said little electro-pneumatic loop.In operator scheme, use two miniature valves 18 to replace a miniature valve that following advantage is arranged: at first, said controlled pressure level directly equals stress level p 1And p 2, very little deviation is only arranged.The second, be minimum the pneumatic conversion time that is used for two transfer processes.Shortcoming is higher manufacturing cost and space requirement.At Fig. 3, among the C, the valve that valve is configured to normally open, another is configured to normally closed valve.Can avoid a piezo electric valve must forever keep driving condition, for example compressive state like this.
Fig. 4 has showed the fluid ejector 4 according to the valve principle work.It should be noted; The invention is not restricted to illustrated embodiment; These embodiment only constitute the example of possible embodiment, because the type of the executive component of said injector 4, especially injector is inessential in the present invention; As long as its total design expression goes out required pneumatic control valve effect, has the enough little response time and sufficiently high throughput of fluid amount is just passable.
The said valve principle continuous operation principle of fundamentally saying so, it can be used for producing fixing fluid and sprays.Can carry out the printing of need based jet through using very short valve to open the time (about microsecond is to millisecond), simultaneously through using the variable valve time of opening to obtain variable distribution volume.
Fig. 4, A have showed the embodiment of diaphragm valve as fluid ejector 4.The driving element of barrier film 8 forms, controlled pressure p cPressurization and one of which side make it contact with sealing surface 10, as controlled pressure p cSurpass fluid pressure p F1The time, valve opening 9 closures, this opening is connected to said fluid issuing 6 (Fig. 4, A, the left side).On the contrary, if controlled pressure p cLess than fluid pressure, fluid pressure will lift said barrier film 8 from said sealing surface 10, and fluid flows into through said valve opening 9, and discharges from injector 4.Diaphragm valve provides high sealing (because elasticity of said barrier film), high-speed operation (because the very little piece of said barrier film) and the advantage that is easy to make.In the present invention, the use of term " barrier film " will be not limited to be used for the chivalrous definition that science of strength for materials uses, and barrier film only can transmit pulling force.On the contrary, in this article, this term also may extend to the situation of " plate ", and it can transmit bending moment, and promptly barrier film can be processed or had thickness by harder material, and this meets the definition of " plate " usually.Material also not restriction in the present invention about said barrier film; Suitable material for example; Metal, thin glass, silicon, SiN, thermoplastic (for example PTFE, E/TFE, PFA, PVC, ABS, SAN, PP, PA, POM, PPO, PSU, PEBA, PEEK, PEI; Title according to ISO 1043.1), thermoplastic elastomer (TPE) (TPE), elastomer (for example NBR, HNBR, CR, XNBR, ACM, AEM, MQ, VMQ, PVMQ, PMQ, FVMQ, FKM, FFKM, AU, EU, ECO, CSM, NR, IR, BR, SBR, EPDM, EPM, IIR, CIIR, BIIR, TPE; Description according to ISO 1629), polyimides, rubber and vulcanized rubber, natural/synthetic rubber, thermosets (for example UP, PF, UF, UP-GF, according to the description of ISO 1043.1), all polymer, comprise and filling or fibre-reinforced polymer.
A change example of printhead of the present invention is that said injector 4 is two diaphragm valves, by controlled pressure p cDrive.Fig. 4, B have showed two diaphragm valves, as another embodiment of fluid ejector 4.Replace and use like Fig. 4, the single barrier film 8 shown in the A, the function that it combines valve to drive and seal realizes these functions here respectively.First barrier film 8 with area A 1 receives the effect of static pressure, and this static pressure is passed to the potted component of the said valve of sealing through coupling element 12.Fluid contacts with second barrier film 8, and said second barrier film 8 has area A 2, and is connected to coupling element and potted component 11.Said coupling element can be thought insert, and the ball or the cylinder that for example insert perhaps can be thought and said first barrier film 8 and/or second barrier film 8 compound together.First barrier film, coupling element, second barrier film 8 and potted component can be single coherent structures, are for example processed by elastomeric material.A2<a1 is through controlled pressure p C1<p FICan obtain enough axial forces and surface pressing, be used to seal said valve opening.Like what describe among the embodiment, said pair of diaphragm valve has two ports that are used for controlled pressure, to keep two controlled pressure p C1And p C2In one constant, and through said little electro-pneumatic drive circuit another, these two ports can be by the different combinations supply, thus two diaphragm valve has meaning.
For example by static pressure p St=p F1Supply p C1, and the controlled pressure in said little electro-pneumatic loop is connected to p C2Work as p C2During increase, because effective fluid pressure p FIIn pressure p C2Arrive the stress level p of fluid before FI, said fluid valve is opened.On the contrary, also can supply p by the controlled pressure that said little electro-pneumatic loop provides C1, for example work as p C2When under atmospheric pressure, remaining unchanged.
Fig. 4, C have showed single diaphragm valve, and it comprises mechanical couplings and sealing device, another embodiment of the fluid ejector 4 that drives as barrier film.Bar 12 through radial seal sealing is passed to valve seal 11 with the motion of said barrier film.Through applying the suitable combination of static pressure and controlled pressure, utilize port p C1And p C2Accomplish and drive.
Other embodiment of the pneumatic fluid valve that does not show herein; Mechanical drive element, potted component or the transformational structure that can comprise all types and form; For example inclination-lever element (tipping-and leveraging elements), pneumatic deformable corrugated tube, flexible pipe or balloon or air rammer are with closed or open valve opening 9.
In order to explain apparatus and method of the present invention, showed the different exemplary embodiments of pneumatic fluid injector among Fig. 5, these injectors are according to the displacement of fluid principle work.These embodiment are preferred in the free spray distribution application.Among these embodiment each showed suction and spray regime, and these states are significant conditions of displacement of fluid principle.
Fig. 5, A have showed the basic functional principle that is used to produce the pneumatic fluid displacer that fluid sprays.At pressure is p F1Said fluid intake 7 can obtain fluid, this pressure is environmental pressure p uRank.At sucting stage, controlled pressure p cPressure p fl less than fluid.Under the situation of desirable elastic diaphragm 8, controlled pressure is passed to the fluid that is arranged in injector chambers 17 losslessly, thereby for example ball valve 13 is opened, and makes fluid get into said injector chambers, and the ball of ball valve 13 is kept in position by valve spring 14.Through controlled pressure is converted to p c>p FI, said inlet valve 15 changes closure state into, and said fluid issuing valve is opened, and discharges fluid.In order to obtain fluid output completely and fluid disengaging completely, the quick swing of the controlled pressure between two states is necessary, and this is in the present invention through using little electro-pneumatic loop to realize.
Pass through controlled pressure p according to the present invention cThe discharging of highly of short duration pressure pulse realization fluid (Fig. 5, B).This pressure transmits through said barrier film 8, so that the fluid in said injector chambers 17 is exerted pressure.Then through fluid through the injection of said fluid issuing 6 and get into said fluid and supply with 7 fluid and reflux releasing fluid pressure.After the pressure pulse of controlled pressure, controlled pressure is dropped rapidly to its lower stress level, and best situation is that this lower pressure levels is lower than fluid pressure p FI(Fig. 5, the embodiment among the B).Along with the pressure in the injector chambers is brought down below pFI, fluid gets into injector chambers 17 through said inlet opening.Low pressure in the injector chambers 17 acts on said fluid issuing simultaneously.The capillary force that fluid meniscus in the hole of said fluid issuing produces makes in the said injector chambers sets up vacuum, and prevents to suck air in this stage through said fluid issuing.The more little capillary force of capillary diameter is big more in flexible pipe.They are quadratic power and reduce with the increase of diameter, so the ink jet principle only is used for high-resolution digital printing, at the alcove of the printing that is used for low viscosity fluid, use minimum fluid issuing 6 (nozzle).
Fig. 4, C have showed an embodiment, have used harder barrier film 8, and this barrier film is than Fig. 5, and used barrier film has higher restoring force among the B.In this case, the restoring force of said barrier film 8 is mainly used at sucting stage, is absorbed in the fluid in the said injector chambers 17.Therefore lower controlled pressure level needs not be Fig. 5, the low pressure in the B among the embodiment.
Injector of the present invention can be by Fig. 3 according to the displacement of fluid principle work, and the operator scheme 1 of the little electro-pneumatic loop structure among the A advantageously drives.Use this structure, because opening fast of normally closed piezo electric valve as the result of electric control signal, can be implemented in the quick change of microsecond scope controlled pressure, this helps the fluid discharging.At sucting stage; Hope that the pressure in the said injector chambers 17 slowly reduces; Thereby the capillary pressure that guarantees the ratio fluid issuing that pressure can not descend is low, the result, and air is inhaled into said injector chambers through said fluid issuing 6 and has replaced fluid to supply with 7 suction injector chambers through said fluid.Greater than the time constant that is used to improve controlled pressure, can realize the slow reduction of said injector chambers internal pressure through time constant that said little electro-pneumatic loop is designed for reducing controlled pressure.This can be through selecting R K>R vThereby realize in little electro-pneumatic loop of designing in said capillary 23 design drawings 3 patterns 1.
Fig. 5, D has summarized Fig. 5, and two further favourable improvement of B can realize respectively.At first, said barrier film 8 has two and is just cooperating retainer (positive-fitting stops), thereby limits from the volume of the fluid of said injector chambers discharge through geometry is accurate.The second, when said barrier film 8 begins to contact with the lower surface of approaching said fluid issuing 6, can force fluid to break away from suddenly at said fluid issuing.
As shown in Figure 6, more than one injector 4 can be mainly by the controlled pressure p with single path cDrive, therefore, each path can comprise more than one injector (Fig. 6, A).If comprise two injectors, then these two injectors can all be handled identical fluid or different fluids or fluid and gas, discharging or internal mix or external mix respectively.
And, but injector of each Self Control of path of the independent control of several electricity, the output of these injectors can be combined as a whole, and is used for producing mixing.
Printhead of the present invention for example can comprise first injector of controlling fluid; Second injector of control atomizing air; Said injector is by the controlled pressure driven in common of single path; Perhaps the controlled pressure through two paths drives respectively, and the fluid issuing of said first and second injectors is combined as a whole, thereby passes through air with said fluid atomizing.Said fluid issuing can be integrated in printhead (not shown) internal junction, perhaps carries out the atomizing of said fluid in the outside of printhead, like Fig. 6, and the embodiment shown in the B.The controlled pressure of single path infeeds in the chamber on said membrane layer top, like Fig. 6, and the example shown in the left side of B.At electric driving condition (low p c), said fluid valve and atomization air valve are opened, thus atomizing air and fluid are discharged through its corresponding fluid issuing.The said fluid issuing 6 that is used for atomizing air can be installed as the nozzle ring 6 that for example centers on said fluid issuing 6 with one heart, thereby at the outside generation fluid atomizing of said printhead.Under the simplest situation, also can be through realizing atomizing at the fluid of said printhead outside and the crosswise jet of air.In principle, fluid atomizing need be used for the pipeline of atomizing air, with these pipe design for to make the inside of fluid or exterior atomization become possibility through atomizing air.In simple change example, control atomizing air continuously or off and on from the outside.
When only using single path, through the said controlled pressure p of concrete selection cInlet point, and effectively make good use of time delay, can the conversion of acquisition time, particularly control overlapping time, like Fig. 6, B is described.When using Fig. 3, B, during little electro-pneumatic loop shown in the operator scheme 1, this structure makes atomizing air simple flow always before the fluid discharging or after the discharging, thereby has avoided not have the fluid injection that atomizes.
Fluid ejector also can comprise more than one fluid issuing (Fig. 6, C and D).This means that more than one nozzle (fluid issuing 6) is used for each digital address path, can obtain the layer thickness on fluid distribution more uniformly or surface like this, perhaps accomplished further task.For example, several fluid issuings 6 can adjacent or mutual each other front and back, being arranged in the staggered rows of diagonal angle or any regular.The staggered rows of at least two fluid issuings 6 is favourable arrangements.Like Fig. 6, D is described, and number is i, i>1 fluid issuing 6 distributes to an addressable path n of numeral.
Fig. 7, A have showed the preferred embodiment of printhead, and wherein said miniature valve 18 is configured to normally open, and are connected to two stress level p 1And p 2In higher that, wherein said fluid ejector is a pneumatic diaphragm valve.This embodiment is Fig. 3, B, little electro-pneumatic loop 2 and the Fig. 4 shown in the operator scheme 1, the combination of the fluid ejector 4 shown in the A.When favourable size, stress level p 1, for example be set at 2-5bar, the stress level p of second port of pneumatic throttle 23 2Be set at environmental pressure, the stress level of fluid remains on 0.80x p 1Said structure and pressure are set and are guaranteed that said fluid pressure always is lower than p 1Even barrier film is revealed like this, does not also have fluid permeability and goes into the electrical sensing zone to said pneumatic valve chamber.
In this embodiment; Little electro-pneumatic loop 2 of said apparatus and method the application of the invention of the present invention make valve stroke be the piezo electric valve of about 0.05mm to be extended to the stroke that is positioned at fluid ejector 4 be the diaphragm valve of 0.2mm to 0.5mm, if for example used thickness is the elastomeric septum valve 8 of 0.05mm.Through using elastomeric septum, also can handle high particulate load fluid, particle size range is 1/10th millimeters.On the one hand, the deflection of said elastomeric septum a few tenths of a mm allows passing through of under open mode particle, and on the other hand, at the closure state of said valve, the elasticity of the height of said barrier film also produces effective seal, because particle has been bottled up by said elastic diaphragm.Because the elasticity of the height of said elastomeric septum, said barrier film only produces low internal stress with contacting of abrasive grain, and it can not damage said barrier film.Said barrier film " surrender ", thus elastomeric septum is preferred in other barrier film, particularly when having abrasive grain.
Use said structure, the time of opening said valve is 0.05ms to 0.2ms, the time of closed said fluid valve < 0. 05ms.Have only the microminiaturized pattern through said little electro-pneumatic loop could obtain these short conversion time, and guarantee that the discharging frequency is the injection of fluid completely of kHz scope, said fluid is to have high viscosity and/>or particles filled fluid.
Fig. 7, B have showed the embodiment of printhead, and it is specially adapted to the free jet printing of fluid.Said printhead comprises miniature valve 18, is configured to normally closed miniature valve, and this miniature valve is connected to two stress level p 1And p 2In higher.Said fluid ejector 4 is barrier film displacement of fluid types.Said embodiment has combined Fig. 3, little electro-pneumatic loop 2 and Fig. 5 of A operator scheme 1, and the fluid ejector shown in the C, said fluid ejector disposes harder barrier film 8, and the thickness that for example uses PEEK to process is 0.1mm.Can use with like Fig. 7, the said printhead of element operation of the same size in little electro-pneumatic loop of A.Because the aerodynamic drag of said pneumatic throttle 23 is bigger than the aerodynamic drag of the miniature valve of opening 18, so after fluid sprayed, the time constant that the pressure of said controlled pressure discharges was big equally, that is, controlled pressure usually slowly reduces.Hope to take place this behavior at the fluid sucting stage.On the other hand, the flow resistance of the miniature valve of opening 18 and the volume of said pneumatic node 5 are very little, after the electricity of miniature valve 18 drives, because pressure pulse can produce effective fluid injection fast.
As the shortcoming of this structure, because the increase of said fluid issuing diameter and the reducing of capillary force of said fluid issuing thereupon, need consider that long filling time and lower operating frequency are to prevent that air is sucked said injector chambers.
Fig. 8 has showed that the embodiment of the printhead of being processed by several checker plates passes the cutaway view of metering path.It is based on Fig. 3, B and Fig. 4, the structure shown in the A.Tens of or hundreds of similar paths are arranged in a row perpendicular to the sketch plane.
According to the present invention, said checker plate can be processed by metal, organic material or inorganic material respectively.Therefore be that to make intimate element of several or whole paths be that the part of common structure is favourable with said Design of Mechanical Structure.Thereby; The valve seat of the pneumatic micro valve 18 of the some or all of paths of for example said printhead 1 and valve opening are contained in the checker plate PP2; See Fig. 8; And/or the capillary in little electro-pneumatic loop of several or whole paths of said printhead 1 and/or pneumatic throttle 2 are contained in the checker plate PP3; And/or the parts of the monotype piezoelectric actuator 21 of the miniature valve 18 in several or whole paths of said printhead 1 are contained in the checker plate; And/or the like that the fluid of several or whole paths of valve seat and/or said printhead is supplied with is contained in the common checker plate PF1, and/or the fluid issuing of several or whole paths of said fluid issuing and/or said printhead is contained in the checker plate PF2.Barrier films several or whole paths also can be the parts of complete diaphragm element.
Because the high request of the size of component precision in said little electro-pneumatic loop; The valve opening of capillary or said miniature valve for example; And the high request of said fluid ejector size of component precision; For example said fluid issuing, valve seat and valve opening, the present invention advises using micro mechanical technology to make at least one in the said checker plate.Learn that from microsystems technology (MEMS) and micro-structural engineering micro mechanical technology comprises whole manufacturing technologies and technology.Photoetching technique for example capable of using and etching technique (subtractive process), or also be that the layer (additional process) of photoetching reticulate pattern is realized pneumatic capillary, fluid passage, fluid issuing and valve seat on the piconet card of single or double through increasing.In addition, micro mechanical technology comprises micro injection molding or other clone method.
According to the present invention, these checker plates or piconet card combine through bonding, welding, melting welding or laminating.
As the manufacturing technology of cheapness, suggestion uses multilayer technique to make said printhead or its parts.Multilayer technique is the technology that is used to produce multilayer board (PCB) at first.Plurality of layers is used for electronic device, bondplys for example, and etched metallic plate (0.05mm-0.5mm is thick) replaces, and it is equivalent to for example above-mentioned checker plate or piconet card.Therefore, use laminating that these are hardened and close, just as the adhesive sheet (plate is bonding, pre-preg) that in circuit board making, uses pre-cut pre-preg, for example based on the adhesive sheet of epoxy resin or acrylic acid ester.
In order to operate, to clean and keep in repair, being bonded into attaching parts through the checker plate with some group, to make its combination be favourable.According to the present invention, for example, said checker plate is combined into a unit, and said checker plate comprises the element in little electro-pneumatic loop of several or whole paths.This can be called Pneumatic component 24.In embodiment as shown in Figure 8, said Pneumatic component comprises plate PP1 and PP2, PP3 and PP4.Said Pneumatic component 24 advantageously comprises and only bears very little wearing and tearing or do not wear and tear, and/or it makes expensive element and structure.
According to the present invention, it is favourable that the fluid conveying part of said printhead is combined into fluidic component 25, and said fluidic component 25 is made up of checker plate (in Fig. 8, being plate PF1 and PF2) and selectable barrier film 8.The plate of said fluidic component, element and structure receive the wearing and tearing and the pollution of fluid.Therefore, make said fluidic component and to make it replaceable be significant cheaply.According to the present invention, it is further favourable that the fluid conveying part of said printhead is combined into fluidic component 25, replaceable through dismountable connection fluidic component.Because the material that uses and the structural design of said fluidic component can be fit to the fluid of wide region or the requirement of print out task or allocating task.In order to print high viscosity, chemical corrosivity fluid, for example can use fluorinated polymer material.The diameter of said fluid issuing can be used for obtaining required drop size.When if the printing abrasive for example has the coating of pigment powder and filler; The present invention's suggestion is designed to disposable unit with said fluidic component 25; Make its element through injection-moulding plastic; And said combination of elements is got up through laminating, bonding or thermally coupled technology, particularly ultrasonic bond, Laser Welding, melting welding or impulse welding.
The most preferred embodiment of embodiment of the present invention
At Fig. 8, showed Pneumatic component 24 among the A, its lid PP1 comprises electronic circuit board, this electronic circuit board has control electronic device 26, is used to drive the piezoelectric actuator of the miniature valve of several or whole paths.Spring through contacting with said circuit board directly contacts with said little electric device 19, and realization contacts with said piezoelectric element.The contact of said spring also provides power F, so that said valve actuator is depressed on the said valve seat, thereby makes miniature valve 8 remain on normally closed position.
Fig. 8, B1 have showed the embodiment of fluidic component 25, and said fluidic component 25 comprises plate PF1 and PF2, and each path has a fluid ejector 4, and said fluid ejector 4 utilizes the valve principle, and each fluid ejector 4 has a plurality of fluid issuings 6.Said first fluid plate comprises the parts of fluid supply structure 7 and the valve opening 9 of circular port parts, valve seat 10 and corresponding fluid valve.Said second fluid plate comprises the part complementary with each path of said fluid supply structure 7, and at the fluid issuing of bottom.If hope to obtain thicker distribution at each addressable pixel place, each injector 4 shown in the use has the structure of more than one fluid issuing 6, bigger path spacing, thus lower print resolution is favourable.Fig. 8, the said fluidic component 25 of B1 is fit to combine through the alignment pin (not shown) with membrane layer 8 independent, that cross over all paths and said Pneumatic component 24, is pressed into together between the clamp of clamping device then.
Fig. 8, B2 have showed the fluidic component 25 of side injection structure.Said membrane layer is through being welded and fixed to said fluidic component 25, thereby the fluid when having avoided changing said parts is revealed and polluted.Perhaps, barrier film 8, or other barrier film 8 can be fixed to said Pneumatic component, infiltrates through said Pneumatic component 24 to avoid dust or liquid.
The present invention suggestion is pressed in said fluidic component 25 on the checker plate of the said Pneumatic component 24 that comprises n said controlled pressure port through hold down gag, thus 8 pneumatic connections of driver diaphragm of the n of said Pneumatic component controlled pressure opening and said each respective injectors.Pneumatic component 24, parts 25 and fluid diaphragm 8 can pass through the hold down gag of screw accessory, Press fitting form, and fastener or clamp are pressed together.Barrier film 8 commonly used because the advantage of its elastic performance also can be further used for the sealing between fluid and Pneumatic component 24, the parts 25, is used in particular for face seal.
According to the present invention, membrane layer can be connected to said fluidic component, for example said barrier film 8 is soldered to said fluidic component 25, like Fig. 8, (example that side sprays) shown in the C, said fluidic component 25 comprises the barrier film of several paths.Therefore, said printhead only comprises two modular constructions, compares with three modular constructions, and two modular constructions have the replacing of handling said fluidic component faster and the advantage of the inner sealing property between fluidic component 25 and the barrier film 8.Yet same, the said membrane layer 8 or second membrane layer can be connected with said Pneumatic component securely.
According to the present invention, for example said Pneumatic component 24 can be fixed to through the screw accessory and print or metering device.Said printing or metering device can comprise clamp or the quick locking fitting that can insert barrier film 8 and fluidic component 25, work as complete matching, and it is pressed to the bottom of said Pneumatic component 24.
When changing different fluids, when changing the barrier film of different configuration, defectiveness or wearing and tearing, when changing other configuration, fluidic component 25 dirty or that pollute, such modular design provides maximum flexibility.
About multi-color printing (for example; 4 looks, 5 looks, 6 looks), the present invention has advised a kind of device, wherein printhead comprises the flat sheet mould 34 of a plurality of arrayed; Each flat sheet mould is processed thin, the reticulate pattern formula, parallel-plate; Each flat board comprises the characteristic in fluid ejector and little electro-pneumatic loop, sees Fig. 9, and said piconet card is preferably the metallic plate that uses etching technique to process.For said metallic plate is combined, the present invention advises using checker plate adhesive and laminating technology.Module 34 comprises said little electro-pneumatic loop of lateral arrangement and is configured to the for example said fluid ejector of side injection, and one or more pigment.According to the present invention, supply with perpendicular to the said plate of the whole width that runs through said printhead and to be used for color dye supply line and pneumatic supply line.For the independent module of replacing that can be easy, module stack (module-stack) preferably is pressed between two said margin plates 35 removably.Like what Fig. 9 advised, each module can comprise independent Electronic Control, and under the situation of 4 look printheads, 4 path microchips are very suitable.The fluid issuing of every kind of color path can be arranged in parallel, the each interval certain distance, and they also can guide to common fluid issuing in inside jointly, thereby realize internal mix.Finally, like Fig. 6, shown in the B, in addition also can be with the pigment atomizing of discharging.Can realize atomizing through the air of atomizing continuously, or also can realize atomizing discontinuously through the extra path of controlling said atomizing air.

Claims (16)

1. printhead is specially adapted to viscosity or particles filled fluid, and this printhead has multi-path, and a path is characterised in that and comprises:
Little electro-pneumatic loop (2); Comprise the series loop of being made up of the miniature valve (18) and the pneumatic throttle (23) that are between first stress level and second stress level, said little electro-pneumatic loop is used for locating to produce controlled pressure p at the common pneumatic node (5) of miniature valve (18) and pneumatic throttle (23) c,
The fluid ejector of drop-on-demand (4), it has by said controlled pressure p cThe barrier film (8) that drives, said fluid ejector (4) control is through the fluid discharging of fluid issuing (6).
2. printhead according to claim 1 is characterized in that, is used for said controlled pressure p cThe time constant that state changes is more preferably less than 100 microseconds preferably less than 1 millisecond.
3. printhead according to claim 1 is characterized in that, the fluid ejector of said drop-on-demand (4) through utilize barrier film (8), according to the valve principle work, first of said barrier film (8) by controlled pressure p cDrive, and its second with valve seat (10) and valve opening (9) jointly as fluid valve, this fluid valve control is exported through the fluid of fluid issuing (6).
4. printhead according to claim 1 is characterized in that, the fluid ejector of said drop-on-demand (4) is according to displacement principle work, as controlled pressure p cWhen making barrier film (8) deflection, barrier film (8) is discharged the fluid in the injector chambers (17), thereby sprays fluid through fluid issuing (6).
5. printhead according to claim 1 is characterized in that, barrier film (8) comprises elastomer.
6. printhead according to claim 1 is characterized in that, miniature valve (18) is a piezo electric valve, preferably has piezoelectric bending transducer.
7. printhead according to claim 1 is characterized in that, comprises Pneumatic component (24), and this Pneumatic component comprises little electro-pneumatic loop (2) of a plurality of paths.
8. printhead according to claim 1 is characterized in that, comprises fluidic component (25), and this fluidic component comprises the fluid control component of a plurality of paths.
9. according to claim 7 or 8 said printheads, it is characterized in that, is dismountable connection between said Pneumatic component (24) and the said fluidic component (25).
10. according to claim 1 or 3 described printheads; It is characterized in that; Said miniature valve (18) is configured to normally closed, and is connected to lower that in said two stress levels, and said pneumatic throttle (23) is connected to higher that in said two stress levels.
11. according to claim 1 or 3 described printheads; It is characterized in that; Said miniature valve (18) is configured to normally open, and is connected to higher that in said two stress levels, and said pneumatic throttle (23) is connected to lower that in said two stress levels.
12. according to claim 1 or 4 described printheads; It is characterized in that; Said miniature valve is configured to normally closed, and is connected to higher that in said two stress levels, and said pneumatic throttle (23) is connected to lower that in said two stress levels.
13. printhead according to claim 1; It is characterized in that; Comprise first injector (4) and second injector (4); The said first injector discharge liquid, the atomizing air of said second injector control pressurization, the fluid issuing 6 of said first and second injectors is set to make said liquid by said air atomizing.
14. with the method for printhead prints fluid, wherein in a path with multi-path:
Electric control signal is changed into the pneumatic control pressure p on the common pneumatic node (5) of miniature valve (18) and pneumatic throttle (23) through little electro-pneumatic loop (2) c, said little electro-pneumatic loop comprises the series loop of being made up of miniature valve between first and second stress levels (18) and pneumatic throttle (23),
Said control voltage p cBe used to drive the barrier film (8) of the fluid ejector (4) of drop-on-demand, said barrier film (8) control is through the fluid discharging of fluid issuing (6).
15. the described manufacturing approach with printhead of multi-path of claim 1 is characterized in that, makes the valve seat (20) and the valve opening of the miniature valve (18) of multi-path through the manufacturing approach in microsystems technology field, with common plate.
16. the described manufacturing approach with printhead of multi-path of claim 1 is characterized in that, makes the pneumatic throttle (23) of multi-path through the manufacturing approach in microsystems technology field, with common plate.
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EP2442983A1 (en) 2012-04-25
DE102009029946A1 (en) 2010-12-30

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