DK146198B - Apparatus for generating parallel streams of small liquid droplets, specifically for use in inkjet printers - Google Patents
Apparatus for generating parallel streams of small liquid droplets, specifically for use in inkjet printers Download PDFInfo
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- DK146198B DK146198B DK004175AA DK4175A DK146198B DK 146198 B DK146198 B DK 146198B DK 004175A A DK004175A A DK 004175AA DK 4175 A DK4175 A DK 4175A DK 146198 B DK146198 B DK 146198B
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- Denmark
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- row
- cavity
- chamber
- liquid
- nozzles
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Links
- 239000007788 liquid Substances 0.000 title claims description 20
- 239000012530 fluid Substances 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims 2
- 238000005452 bending Methods 0.000 description 23
- 239000000463 material Substances 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000004936 stimulating effect Effects 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/025—Ink jet characterised by the jet generation process generating a continuous ink jet by vibration
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Facsimile Heads (AREA)
Description
146198 i o146198 in o
Opfindelsen angår et apparat til frembringelse af parallelle strømme af små væskedråber, således som nærmere angivet i krav l's indledning. I sådanne apparater omdannes væskestrømme fra væskestrenge til små 5 dråber i en vis afstand fra udstrømningsåbningerne.The invention relates to an apparatus for generating parallel streams of small liquid droplets, as further specified in the preamble of claim 1. In such apparatus, liquid streams from liquid streams are converted into small droplets at a certain distance from the outflow openings.
Ved udformningen af blækstråleskrivere med et antal parallelle skrivestråler med ensartede hastigheder, som skal passere en opladningselektrode med henblik på at blive opladet af denne, opstår der vanskeligheder 10 med at bibeholde hver enkelt væskestrøm som en uafbrudt væskestreng i den samme afstand fra udstrømningsåbningerne, så at strengene omdannes til små dråber på det samme sted og tidspunkt. Ved det sted, hvor de små dråber løsrives fra væskestrengen, oplades de selektivt og 15 afbøjes derefter til at følge en bestemt nedstrøms bevægelsesbane ved hjælp af elektrostatiske afbøjningsplader.In the design of ink jet printers having a plurality of parallel writing beams at uniform speeds to pass a charging electrode in order to be charged by it, difficulties arise in maintaining each liquid stream as an uninterrupted fluid stream at the same distance from the discharge openings, so that the strings are transformed into small droplets at the same place and time. At the point where the droplets are detached from the liquid strand, they are selectively charged and then deflected to follow a particular downstream path of movement by means of electrostatic deflection plates.
De afbøjede små dråber kan enten ramme skrivefladen eller blive kasseret, alt efter den anvendte skrivemodus. Dersom det sted, hvor væskestrengen omdannes til små dråber, 20 flyttes, kommer dråberne ikke til at modtage den rigtige ladning, hvorfor de ikke kommer til at afbøjes til det ønskede anslagspunkt. Usikkerheden med hensyn til, hvor dråberne dannes er navnlig til besvær i blækstråleskrivehoveder med flere stråler, da det med disse er meget øn-25 skeligt, at alle de i én række anbragte stråler skriver - eller ikke skriver - i takt med hinanden.The deflected droplets can either hit the writing surface or be discarded, depending on the writing mode used. If the location where the liquid strand is converted into small droplets is moved, the droplets will not receive the correct charge and therefore they will not deflect to the desired impact point. The uncertainty as to where the droplets are formed is particularly troublesome in multi-jet inkjet printheads, since with these it is highly desirable that all the rays arranged in one row write - or do not write - in tandem.
Sædvanligvis anvendes en enkelt ultralyd-omsætter til at frembringe trykvariationer inden i blæktilførselskammeret eller blækfordelingskammeret, så at der ikke 30 opstår problemer med synkronisering af to eller flere omsættere. Imidlertid vil der ved anvendelse af en enkelt vibrerende omsætter til at stimulere dråbedannelsen fremkomme akustiske bølger med varierende intensitet ved udstrømningsåbningerne. Således varierer længden af de en-35 kelte væskestrenge direkte i afhængighed af intensiteten af de stimulerende trykbølger.Generally, a single ultrasonic converter is used to produce pressure variations within the ink supply chamber or ink distribution chamber so that no problems are encountered with synchronizing two or more converters. However, using a single vibrating converter to stimulate the droplet formation will produce acoustic waves of varying intensity at the outflow openings. Thus, the length of the individual fluid strands varies directly depending on the intensity of the stimulating pressure waves.
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Der er tidligere blevet gjort forsøg på at opretholde ensartede stimulerende trykbølger langs med den fulde længde af en række dyseåbninger ved at anbringe omsætteren ved den ene ende af rækken af dyseåbninger, så 5 at den af den vibrerende omsætter frembragte udbøjnings-bølge forplanter sig langs med pladen- Pladens ender er dæmpet for at hæmme reflektion af vibrationerne og for at opretholde en forholdsvis ren stimulationsvariation.Attempts have been made in the past to maintain uniform stimulating pressure waves along the full length of a series of nozzle openings by placing the transducer at one end of the row of nozzle openings so that the deflection wave produced by the vibrating transducer propagates along with plate- The ends of the plate are muted to inhibit reflection of the vibrations and to maintain a relatively pure stimulation variation.
Med denne teknik bliver væskestrengenes længder mere 10 ensartede, men der er vedblivende en forskel mellem længden på væskestrengene nærmest omsætteren og dem der ligger længst væk. De sidstnævnte væskestrenge er tilbøjelige til at blive længere, hvad der medfører forsinket dråbedannelse og uregelmæssig opladning.With this technique, the lengths of the liquid strands become more uniform, but there remains a difference between the length of the liquid strands closest to the transducer and those which are furthest away. The latter fluid strands tend to stay longer, causing delayed drip formation and irregular charging.
15 Det er derfor opfindelsens formål at tilvejebringe et apparat af den indledningsvis nævnte art, hvori længderne af de fra stråledyseåbningerne udstrømmende parallelle væskestrenge er mere ensartede, så at hver væskestreng omdannes til små dråber på omtrent det samme sted 20 og det samme tidspunkt.It is therefore an object of the invention to provide an apparatus of the kind mentioned above, in which the lengths of the parallel liquid strands flowing from the jet nozzle openings are more uniform so that each fluid strand is converted into small droplets at approximately the same location 20 and at the same time.
Det angivne formål opnås ifølge opfindelsens principper ved, at apparatet er udformet som angivet i krav l's kendetegnende del.The stated object is achieved according to the principles of the invention in that the apparatus is designed as specified in the characterizing part of claim 1.
Ved denne udformning opnås, at der frembringes en 25 udbøjningsbølge af ensartet intensitet langs med det vi-brerbare organs længde og langs med rækker eller rækkerne af dyser. På denne måde kan den fra dyseåbningerne udstrømmende væske udsættes for en række trykbølger af ensartet amplitude, så at der samtidigt i alle strømmene frembrin-30 ges identisk formede tykkelsesvariationer. Af denne grund er det lettere at opretholde faseforholdet mellem de forskellige strømmes opladningsspændinger og dråbedannelsen.In this embodiment, a deflection wave of uniform intensity is obtained along the length of the movable member and along the rows or rows of nozzles. In this way, the liquid flowing from the nozzle openings can be subjected to a series of pressure waves of uniform amplitude so that identical shaped variations in thickness are produced simultaneously in all the currents. For this reason, it is easier to maintain the phase relationship between the charging voltages of the different currents and the droplet formation.
Dette medfører en forbedret skriftkvalitet, da dråbernes anslag kan styres mere præcist.This results in improved font quality as the droplet's impact can be controlled more precisely.
35 Opfindelsen skal i det følgende forklares nærmere under henvisning til de på tegningen viste udførelseseksempler på et apparat ifølge opfindelsen, idet 3The invention will be explained in more detail below with reference to the exemplary embodiments of an apparatus according to the invention, in which:
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146198 fig. 1 i perspektiv viser et blækstrålehoved, hvis enkelte dele for overskuelighedens skyld er vist rykket bort fra hinanden, fig. 2 i perspektiv viser det i fig. 1 viste 5 blækstrålehoved i samlet tilstand.146198 fig. Figure 1 is a perspective view of an ink jet head whose individual parts are shown distorted from one another for the sake of clarity; 2 is a perspective view of that of FIG. 1 shows 5 ink jet heads in overall condition.
fig. 3 er et stående snit gennem blækstrålehovedet efter linien 3-3 i fig. 2, fig. 4 viser det i fig. 1 og 3 viste vibrationsbøjningsorgan, set bagfra, 10 fig. 5a og 5b skematisk sammenligner strømme fra et sædvanligt blækstrålehoved og fra et ifølge opfindelsen udformet hoved, og fig. 6 set forfra viser en alternativ udformning af det i fig. 4 viste bøjningsorgan.FIG. 3 is a standing section through the ink jet head along line 3-3 of FIG. 2, FIG. 4 shows that in FIG. 1 and 3, rear view of vibration bending means; 5a and 5b schematically compare flows from a conventional inkjet head and from a head formed in accordance with the invention; and FIGS. 6 is a front elevational view showing an alternative embodiment of FIG. 4.
15 Fig. 1, 2 og 3 viser hvorledes et ifølge opfin delsen udformet blækstrålehoved i hovedsagen består af en bageste kammerblok 10, et vibrationsbøjningsorgan 11, en forreste kammerblok 12, en dyseplade 13, en isolationsplade 14, og en opladningsplade 35. I den bageste kammer-20 blok 10 er der udformet et bagud afsmalnende bageste delkammer 15, mens der i den forreste kammerblok 12 er udformet et fremad afsmalnende forreste delkammer 16. Når de to kammerblokke 10 og 12 fastgøres til hinanden på hver side af vibrationsbøjningsorganet 11, dannes der et kam-25 mer med i hovedsagen rhombeformet tværsnit, hvilket kammer tjener som fordelingskammer for et antal blækdyse-åbninger. Det forreste delkammer 16 strækker sig gennem den forreste kammerblok 12, og danner en spalte 17 i blokkens forflade 18. Mellem kammerblokkene 10 og 12 er der 30 anbragt et vibrationsbøjningsorgan 11, der består af et tyndt og elastisk bøjeligt materiale, såsom f.eks. rustfrit stål med en tykkelse på ca. 0,13 mm. De enkelte delkamre 15 og 16's dybde er fortrinsvis lig med en fjerdedel af den bølgelængde, der svarer til vibrationsbøjnings-FIG. 1, 2 and 3 show how an ink jet head according to the invention consists essentially of a rear chamber block 10, a vibration bending member 11, a front chamber block 12, a nozzle plate 13, an insulation plate 14, and a charging plate 35. In the rear chamber-20 in block 10, a rear tapered rear sub-chamber 15 is formed, while in the forward chamber block 12 a forward tapered front sub-chamber 16. When the two chamber blocks 10 and 12 are secured to each other on each side of the vibration bending member 11, a cam is formed. 25 is generally of rhombic cross-section, which chamber serves as a distribution chamber for a plurality of ink nozzle openings. The front sub-chamber 16 extends through the front chamber block 12 and forms a slot 17 in the front face of the block 18. Between the chamber blocks 10 and 12 is arranged a vibration bending member 11 consisting of a thin and elastically flexible material, such as e.g. stainless steel with a thickness of approx. 0.13 mm. The depth of the individual sub-chambers 15 and 16 is preferably equal to one quarter of the wavelength corresponding to the vibrational bending
OCOC
organet 11's driftsfrekvens. Med en sådan dybde frembringes der en stående bølge ved hvert yderparti i kammeret.the operating frequency of the member 11. With such depth, a standing wave is produced at each outer portion of the chamber.
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Vibrationsbøjningsorganet 11 er vist mere detaljeret i fig. 4. Det er stort set af rektangulær form, og er tilstrækkeligt stort til at kunne fastgøres mellem kammerblokkene 10 og 12 og opdele fordelingskammeret i 5 de nævnte forreste og bageste delkamre 16 henholdsvis 15.The vibration bending member 11 is shown in more detail in FIG. 4. It is substantially rectangular in shape and is sufficiently large to be able to be fastened between the chamber blocks 10 and 12 and divide the distribution chamber into the said front and rear sub-chambers 16 and 15 respectively.
Organet 11 omfatter stort set en kantdel 20 (vist med skyggelægningsprikker i fig. 4a og 6), som fastholdes mellem kammerblokkene, og en på lignende måde fastgjort fligdel 21, som er lang nok til at rage ud fra kammer-10 blokkene 10 og 12's ydersider, når disse er samlet. En vibrerende midterdel 22 i vibrationsbøjningsorganet 11 er skåret fri af selve organet ved hjælp af to ende-slidser 23, som strækker sig gennem organets fulde tykkelse. På denne måde er den vibrerende midterdel 22 fri-15 gjort ved enderne.The member 11 comprises substantially an edge portion 20 (shown with shading dots in Figures 4a and 6) which is held between the chamber blocks and a similarly secured tab portion 21 long enough to protrude from the chamber 10 blocks 10 and 12 outer surfaces when these are assembled. A vibrating center portion 22 of the vibration bending member 11 is cut free of the member itself by two end slots 23 extending through the full thickness of the member. In this way, the vibrating center portion 22 is released at the ends.
På den ene side af vibrationsbøjningsorganet 11 er der mellem endeslidserne 23 anbragt et antal omsætterstrimler 24, fortrinsvis piezoelektriske strimler af et materiale som f.eks. bariumtitanat. Disse strimler er til-20 skåret med et forhold mellem længde og bredde på mellem ca. 4:1 og 6:1, og har en tykkelse på ca. 0,25 mm. Omsætterstrimlerne 24's længde er fortrinsvis omtrent den samme som længden af endeslidserne 23, hvis længde i sin tur kan variere i afhængighed af hvor meget udbøjning der 25 ønskes inden i delkamrene 15 og 16. Det piezoelektriske materiale er fortrinsvis valgt med henblik på størst mulig udbøjning. Som vist i fig. 3 strækker omsætterstrim-lerne 24 sig ud forbi delkamrene 15 og 16's øvre og nedre grænser, men de kan gøres kortere, så at de ikke når ud 30 til de kanter i selve fordelingskammeret, som ligger nærmest vibrationsbøjningsorganet 11. Formålet med det forholdsvis store forhold mellem de piezoelektriske omsætterstrimlers længde og bredde er at opnå den størst mulige udbøjning af midterdelen 22 omkring dennes længdeakse. Det 35 piezoelektriske materiale er monteret alene med henblik på ekspansion i sin tykkelse-modus, og når det aktiveres vil 5On one side of the vibration bending means 11, a plurality of transducer strips 24, preferably piezoelectric strips of a material such as e.g. barium titanate. These strips are cut to a length-to-width ratio of between approx. 4: 1 and 6: 1, and has a thickness of approx. 0.25 mm. The length of the transducer strips 24 is preferably about the same as the length of the end slots 23, the length of which in turn may vary depending on how much deflection 25 is desired within the sub-chambers 15 and 16. The piezoelectric material is preferably selected for maximum deflection. As shown in FIG. 3, the transducer strips 24 extend beyond the upper and lower limits of the sub-chambers 15 and 16, but they can be made shorter so that they do not reach 30 to the edges of the distribution chamber which is closest to the vibration bending member 11. The purpose of the relatively large ratio between the length and the width of the piezoelectric converter strips is to achieve the greatest possible deflection of the center portion 22 about its longitudinal axis. The piezoelectric material is mounted alone for expansion in its thickness mode and when activated,
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146198 det være tilbøjeligt til at bøje sig i skålform. De enkelte omsætterstrimlers ringe breddeudstrækning er tilbøjelig til at formindske denne bøjning i skålform, så at der frembringes en udbøjning om en enkelt akse.146198 it tends to bend in bowl shape. The small width of the individual transducer strips tends to reduce this bend in bowl form so that a bend about a single axis is produced.
5 Omsætterstrimlerne 24 er fastgjort til vibra tionsbøjningsorganet 11's midterdel 22 ved hjælp af et klæbemiddel, f.eks. en epoxy-lim. Antallet af og mellemrummene mellem omsætterstrimlerne 24 vil - som nævnt ovenfor - være bestemt af den udbøjning af midterdelen 10 22, som kræves til frembringelse af de nødvendige tryk bølger i den udstrømmende væske. Omsætterstrimlerne 24 er selvsagt monteret i den samme orientering, så at samtlige omsætterstrimler, når de tilføres energi, vil samvirke til udøvelse af en bøjningskraft på midterdelen 22.The transducer strips 24 are attached to the central portion 22 of the vibration bending member 11 by means of an adhesive, e.g. an epoxy adhesive. The number and spacing between the transducer strips 24 will - as mentioned above - be determined by the deflection of the center portion 10 22 required to produce the required pressure waves in the outflowing liquid. The transducer strips 24 are of course mounted in the same orientation so that all transducer strips, when supplied with energy, will cooperate to exert a bending force on the center portion 22.
15 Omsætterne bør være anbragt med ens mellemrum og parallelt med frigørings-slidserne 23. Efter at omsætterstrimlerne er blevet anbragt på vibrationsbøjningsorganet 11, fyldes mellemrummene mellem strimlerne med et passende bindemiddel, som f.eks. epoxy-lim. Derpå forbindes hver 20 omsætterstrimmel elektrisk ved hjælp af en ledningstråd 25, som fastloddes til de enkelte strimlers fritliggende overflade og til et afslutningsstykke 26, som ved hjælp af et passende klæbemiddel er fastgjort til vibrationsbøjningsorganet 11. Ved afslutningsstykket 26 forbindes 25 ledningstråden 25 med en isoleret ledning 27, som fastgøres langs med fligdelen 21 ved hjælp af klæbemiddel.The transducers should be spaced at equal intervals and parallel to the release slots 23. After the transducer strips have been placed on the vibration bending member 11, the spaces between the strips are filled with a suitable binder such as e.g. epoxy glue. Thereafter, each 20 converter strip is electrically connected by means of a conductor wire 25 which is soldered to the exposed surface of the individual strips and to a termination piece 26 which is secured to the vibration bending member 11. By means of a suitable adhesive, the conductor wire 25 is connected to an insulated conduit 27 which is attached along the tab portion 21 by adhesive.
Derefter dækkes omsætterne 24 og ledningstråden 25 med et isolerende beskyttelsesmateriale, der tjener som fug-tighedsforsegling. Der kan anvendes en polyurethan eller 30 et andet egnet materiale.Thereafter, the transducers 24 and the wire 25 are covered with an insulating protective material which serves as a moisture seal. A polyurethane or other suitable material may be used.
Vibrationsbøjningsorganet 11 med de herpå anbragte omsætterstrimler 24 anbringes mellem kammerblokkene 10 og 12 under anvendelse af et par pakninger 30 som vist i fig. 1 og 3. I den ene af blokkene, f.eks. blokken 35 10, er der udformet en udsparing 31 for at gøre det mu ligt for fligdelen 21 med ledningen 27 at strække sig ned 146198The vibration bending member 11 with the transducer strips 24 disposed thereon is placed between the chamber blocks 10 and 12 using a pair of gaskets 30 as shown in FIG. 1 and 3. In one of the blocks, e.g. block 35 10, a recess 31 is provided to make it possible for the tab portion 21 with the cord 27 to extend down 146198
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6 under blokkens underside med henblik på at kunne forbindes med en passende elektrisk signalgenerator 28, som f.eks. en sinusbølge-generator. Ved at anvende et elektrisk ledende vibrationsbøjningsorgan 11 og et elektrisk 5 ledende klæbemiddel til fastgørelse af omsætterstrimlerne 24 forenkles energitilførselskredsen. Kammerblokkene 10 og 12 fastgøres fortrinsvis til hinanden ved hjælp af skruer, som er således anbragt, at de forhindrer lækage af væske under tryk fra kammeret. Dysepladen 13 fastgø-10 res til isolationspladen 14's bagside ved hjælp af et klæbemiddel, hvorefter begge fastgøres til kammerblokken 121 s forflade 18 ved hjælp af passende organer, som f.eks.6 below the bottom of the block in order to be connected to a suitable electrical signal generator 28, e.g. a sine wave generator. By using an electrically conductive vibration bending member 11 and an electrically conductive adhesive for attaching transducer strips 24, the energy supply circuit is simplified. The chamber blocks 10 and 12 are preferably secured to each other by means of screws which are arranged to prevent leakage of liquid under pressure from the chamber. The die plate 13 is secured to the back of the insulating plate 14 by means of an adhesive, after which both are attached to the front surface 18 of the chamber block 121 by suitable means, such as e.g.
(ikke viste) skruer. En pakning 31 anvendes til at tilvejebringe tætning. Derefter fastgøres isolationspladen 15 14 til dysepladen 13 med åbningerne 34 flugtende med dyse åbningerne 33. Isolationspladen 14 anvendes for at muliggøre en efterfølgende fastgørelse af en opladningsplade 35, som indeholder opladningsringe 36, ved hvis hjælp der kan foretages en selektiv opladning af væskedråber, når 20 disse løsrives fra de væskestrenge, som strømmer ud gennem dyseåbningerne 33. Dyseåbningerne 33 kan variere i størrelse fra 0,013 til 0,038 mm i diameter, mens hullerne 34 er større, f.eks. 0,15-0,20 mm.(not shown) screws. A seal 31 is used to provide sealing. Thereafter, the insulating plate 15 14 is attached to the nozzle plate 13 with the openings 34 flush with the nozzle openings 33. The insulating plate 14 is used to enable a subsequent attachment of a charging plate 35 containing charging rings 36, by means of which a selective charging of liquid droplets can be made when 20 these are detached from the liquid strands flowing out through the nozzle openings 33. The nozzle openings 33 can range in size from 0.013 to 0.038 mm in diameter, while the holes 34 are larger, e.g. 0.15-0.20 mm.
Efter at blækstrålehovedet er blevet samlet, for-25 bindes det med passende tilførselsorganer for blæk under tryk, som antydet ved en pumpe 37 og et rør 38, som står i forbindelse med en indløbskanal 39, som langs med en not eller rende står i forbindelse med delkamrene 15 og 16 som vist i fig. 3. Afluftningskanaler 43 med propper 3° 44 gør det muligt at lade luften undvige under indfyld- ningen. Da de to delkamre er forbundet med hinanden gen-. nem slidser i vibrationsbøjningsorganet 11, hersker der det samme tryk i begge delkamre, så at der tilvejebringes en statisk trykudligning. Vibrationsbøjningsorganet 11's 35 fligdel 21 og ledningen 27, som strækker sig nedad under blækstrålehovedets underside, forbindes til udgangen 7After the ink jet head has been assembled, it is connected to suitable ink supply means, as indicated by a pump 37 and a tube 38 which communicates with an inlet channel 39 which communicates along a groove or gutter. with the sub-chambers 15 and 16 as shown in FIG. 3. Bleeding ducts 43 with plugs 3 ° 44 allow the air to evade during filling. Since the two sub-chambers are connected to each other. easy slots in the vibration bending member 11, the same pressure prevails in both sub-chambers to provide a static pressure equalization. The flap portion 21 of the vibration bending member 11 and the conduit 27 extending downwardly below the underside of the ink jet head is connected to the output 7
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146198 i sinusbølge-signalgeneratoren 28, som kan afgive et aktiveringssignal i f.eks. området 60-120 kHz til de piezoelektriske omsætterstrimler 24.146198 in the sine wave signal generator 28 which can output an activation signal in e.g. the range 60-120 kHz to the piezoelectric converter strips 24.
Mens blæk under tryk presses ud gennem de på en 5 retliniet række anbragte dyseåbninger 33, bringer de på de piezoelektriske omsætterstrimler 24 påtrykte impulser vibrationsbøjningsorganet 11's midterdel 22 til at udbøjes til en stilling, som er vist med en punkteret streg 40 i fig. 3. Signalgeneratoren kan have den ene side af 10 udgangen forbundet med jord, eller udgangen kan være symmetrisk om jordpotentialet. I sidstnævnte tilfælde vil vibrationsbøjningsorganet 11 selvsagt udbøjes mellem de to punkterede streger 40 og 41. Ved aktiveringen af omsætterne 24 ved at bringe midterdelen 22 til at bøje sig 15 frem og tilbage gentagne gange, vil der frembringes trykbølger inden i de afsmalnende delkamre 15 og 16, hvad der medfører en samtidig trykændring i samtlige dyseåbninger 33 i rækken. Dette bevirker at der fremkommer tykkelsesændringer i de fra de enkelte dyseåbninger udstrømmende 20 væskestrenge, hvorved der i hver streng dannes små dråber i den samme afstand fra dysepladen 13.While ink is pressed out through the nozzle openings 33 arranged on a rectilinear row of nozzles 33, the impulses applied to the piezoelectric converter strips 24 cause the central portion 22 of the vibration bending member 11 to bend to a position shown by a dashed line 40 in FIG. 3. The signal generator may have one side of the 10 output connected to ground or the output may be symmetrical about the ground potential. In the latter case, the vibration bending member 11 will, of course, be deflected between the two dotted lines 40 and 41. By activating the transducers 24 by causing the middle portion 22 to bend 15 back and forth repeatedly, pressure waves will be generated within the tapered sub-chambers 15 and 16. , which results in a simultaneous pressure change in all nozzle openings 33 in the series. This causes thickness changes to occur in the 20 fluid strands flowing from the individual nozzle openings, whereby in each strand small droplets are formed at the same distance from the nozzle plate 13.
Der henvises nu til fig. 5a og 5b, som med henblik på sammenligning skematisk viser, hvorledes små dråber dannes med vibrationsindretninger ifølge den tidli- pc gere teknik henholdsvis ifølge en svarende til nærværende opfindelse udformet indretning. Det vil bemærkes, at de væskestrenge 50, som afgives fra den til den tidligere teknik svarende dyseplade i fig. 5a, er tilbøjelige til at omdannes til dråber i forskellige afstande fra dyse- 30 pladen inden i opladningspladen. Omdannelsen af væskestrengene til dråber sker sædvanligvis i et mønster, som er et udtryk for variationerne i bølgeintensitet ved dysepladen og i retning langs med rækken af dyseåbninger. Når der inden i blækfordelingskammeret anvendes et vibrations-35 bøjningsorgan 11 som omtalt ovenfor, vil der i hver væskestreng 51 samtidigt og med den samme intensitet frembrin- 146198Referring now to FIG. 5a and 5b, which, for comparison purposes, show schematically how small droplets are formed with vibration devices according to the prior art or according to a device designed according to the present invention. It will be noted that the liquid strings 50 which are dispensed from the nozzle plate corresponding to the prior art in FIG. 5a, tend to be converted into droplets at different distances from the nozzle plate within the charge plate. The transformation of the liquid strands into droplets usually occurs in a pattern which reflects the variations in wave intensity at the nozzle plate and in the direction along the row of nozzle openings. When within the ink distribution chamber, a vibration bending member 11 is used as mentioned above, in each fluid string 51 simultaneously and with the same intensity,
OISLAND
8 ges en trykvariation, som bevirker dannelsen af ensartede tykkelsesændringer langs med de enkelte væskestrenge, når de strømmer ud af dyseåbningen. Dette medfører den fordel, at dråberne løsrives på det samme sted og på det 5 samme tidspunkt inden i opladningspladen. Ved anvendelse af den sidstnævnte indretning undgås mange af vanskelighederne med at opretholde det rigtige indbyrdes faseforhold i tid og rum mellem til hinanden svarende væskedråber fra rækken af væskestrenge, og som følge heraf vil 10 dråberne ramme en skriveoverflade i en mere præcis indbyrdes flugtning.8, there is a pressure variation which causes the formation of uniform thickness changes along the individual fluid strands as they flow out of the nozzle opening. This has the advantage of dropping the droplets in the same place and at the same time within the charge plate. By using the latter device, many of the difficulties in maintaining the proper inter-phase relationship in time and space between corresponding fluid drops are avoided from the series of fluid strings, and as a result, the 10 drops will hit a writing surface in a more precise mutual flow.
Fig. 6 viser en ændret udformning af vibrationsbøjningsorganet 11, hvor der i omsætterstrimlerne 24's tværretning og på den bort fra dem vendende side af midter-15 delen 22 er anbragt afstivningsribber 45. Disse afstivningsribber 45 anvendes kun efter behov, dersom midterdelen 22 viser en tilbøjelighed til at udbøjes på tværs af den ønskede bøjningsretning. Ribberne 45 kan fastklæbes til bøjningsorganet 11. I stedet for ribber kan der også 20 anvendes et stykke korrugeret mellemlægsmateriale. I begge tilfælde foretrækkes rustfrit stål som materiale for at forhindre tæring. Imidlertid kan der også anvendes andre metaller, dersom dette ønskes.FIG. 6 shows a modified design of the vibration bending member 11, in which, in the transverse direction of the transverse strips 24 and on the side facing away from the middle part 22, stiffening ribs 45 are placed. These stiffening ribs 45 are used only as needed if the middle part 22 shows a tendency to deflected across the desired bending direction. The ribs 45 may be adhered to the bending member 11. Instead of ribs, a piece of corrugated interlayer material may also be used. In both cases, stainless steel is preferred as a material to prevent corrosion. However, other metals may also be used if desired.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43226074 | 1974-01-10 | ||
| US432260A US3900162A (en) | 1974-01-10 | 1974-01-10 | Method and apparatus for generation of multiple uniform fluid filaments |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK4175A DK4175A (en) | 1975-08-25 |
| DK146198B true DK146198B (en) | 1983-07-25 |
| DK146198C DK146198C (en) | 1984-01-16 |
Family
ID=23715405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK4175A DK146198C (en) | 1974-01-10 | 1975-01-09 | Apparatus for generating parallel streams of small liquid droplets, specifically for use in inkjet printers |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US3900162A (en) |
| JP (1) | JPS5517708B2 (en) |
| AR (1) | AR206417A1 (en) |
| BE (1) | BE823707A (en) |
| BR (1) | BR7500155A (en) |
| CA (1) | CA1015022A (en) |
| CH (1) | CH575835A5 (en) |
| DK (1) | DK146198C (en) |
| ES (1) | ES437355A1 (en) |
| FR (1) | FR2257356B1 (en) |
| GB (1) | GB1433861A (en) |
| IT (1) | IT1027647B (en) |
| NL (1) | NL7416761A (en) |
| SE (1) | SE402551B (en) |
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| JPS5121439A (en) * | 1974-08-14 | 1976-02-20 | Matsushita Electric Ind Co Ltd | Inkujetsutohetsudo |
| US4005435A (en) * | 1975-05-15 | 1977-01-25 | Burroughs Corporation | Liquid jet droplet generator |
| US4065774A (en) * | 1975-05-30 | 1977-12-27 | International Business Machines Corporation | Hybrid fluid jet drop generation |
| US4007465A (en) * | 1975-11-17 | 1977-02-08 | International Business Machines Corporation | System for self-cleaning ink jet head |
| DE2700010A1 (en) * | 1976-01-15 | 1977-07-21 | Xerox Corp | DEVICE FOR GENERATING DETACHABLE LIQUID DROPS AND DRIVE ELEMENTS FOR IT |
| US4032928A (en) * | 1976-08-12 | 1977-06-28 | Recognition Equipment Incorporated | Wideband ink jet modulator |
| US4303927A (en) * | 1977-03-23 | 1981-12-01 | International Business Machines Corporation | Apparatus for exciting an array of ink jet nozzles and method of forming |
| US4138687A (en) * | 1977-07-18 | 1979-02-06 | The Mead Corporation | Apparatus for producing multiple uniform fluid filaments and drops |
| US4095232A (en) * | 1977-07-18 | 1978-06-13 | The Mead Corporation | Apparatus for producing multiple uniform fluid filaments and drops |
| US4107699A (en) * | 1977-08-15 | 1978-08-15 | The Mead Corporation | Trenched stimulating plate |
| IL54957A (en) * | 1977-08-29 | 1981-03-31 | Mead Corp | Ink jet printer having liquid communicated traveling wave stimulation |
| US4188635A (en) * | 1977-10-03 | 1980-02-12 | International Business Machines Corporation | Ink jet printing head |
| FR2409654B1 (en) * | 1977-11-17 | 1985-10-04 | Thomson Csf | PIEZOELECTRIC TRANSDUCER DEVICE AND MANUFACTURING METHOD THEREOF |
| JPS54104345A (en) * | 1978-02-03 | 1979-08-16 | Oki Electric Ind Co Ltd | Impulse system ink jet head |
| JPS54130026A (en) * | 1978-02-24 | 1979-10-09 | Oki Electric Ind Co Ltd | Impulse system ink jet head |
| JPS5840508B2 (en) * | 1978-03-15 | 1983-09-06 | 沖電気工業株式会社 | Impulse type multi-nozzle inkjet head |
| US4245225A (en) * | 1978-11-08 | 1981-01-13 | International Business Machines Corporation | Ink jet head |
| JPS5571570A (en) * | 1978-11-22 | 1980-05-29 | Fuji Xerox Co Ltd | Multinozzle ink jet head |
| FR2445229A1 (en) * | 1978-12-29 | 1980-07-25 | Cii Honeywell Bull | INK DROPLET GENERATOR FOR INK JET PRINTER |
| US4282532A (en) * | 1979-06-04 | 1981-08-04 | Xerox Corporation | Ink jet method and apparatus using a thin film piezoelectric excitor for drop generation |
| EP0020182A1 (en) * | 1979-06-04 | 1980-12-10 | Xerox Corporation | Liquid drop generation apparatus and method |
| US4296417A (en) * | 1979-06-04 | 1981-10-20 | Xerox Corporation | Ink jet method and apparatus using a thin film piezoelectric excitor for drop generation with spherical and cylindrical fluid chambers |
| JPS5621863A (en) * | 1979-07-31 | 1981-02-28 | Ricoh Co Ltd | Multinozzle head for ink jet |
| JPS576551U (en) * | 1980-06-12 | 1982-01-13 | ||
| FR2484288A1 (en) * | 1980-06-13 | 1981-12-18 | Hotchkiss Brandt Sogeme | DEVICE FOR GENERATING DROPLETS APPLICABLE IN PARTICULAR IN AN INKJET PRINTER |
| US4383264A (en) * | 1980-06-18 | 1983-05-10 | Exxon Research And Engineering Co. | Demand drop forming device with interacting transducer and orifice combination |
| US4326553A (en) * | 1980-08-28 | 1982-04-27 | Rca Corporation | Megasonic jet cleaner apparatus |
| CA1178191A (en) * | 1980-10-06 | 1984-11-20 | Naoyoshi Maehara | Electric liquid atomizing apparatus |
| US4370662A (en) * | 1980-12-02 | 1983-01-25 | Ricoh Company, Ltd. | Ink jet array ultrasonic simulation |
| IT1144625B (en) * | 1981-08-04 | 1986-10-29 | Olivetti & Co Spa | INK JET POINTER PRINTER |
| US4646106A (en) * | 1982-01-04 | 1987-02-24 | Exxon Printing Systems, Inc. | Method of operating an ink jet |
| US4596990A (en) * | 1982-01-27 | 1986-06-24 | Tmc Company | Multi-jet single head ink jet printer |
| JPS5912775A (en) * | 1982-07-14 | 1984-01-23 | Matsushita Electric Ind Co Ltd | Atomizing pump unit |
| JPS61159679U (en) * | 1985-03-25 | 1986-10-03 | ||
| US4667877A (en) * | 1985-08-15 | 1987-05-26 | Carnegie-Mellon University | Multi-orifice impulsed spray generator |
| US4702418A (en) * | 1985-09-09 | 1987-10-27 | Piezo Electric Products, Inc. | Aerosol dispenser |
| US4746929A (en) * | 1987-01-16 | 1988-05-24 | Xerox Corporation | Traveling wave droplet generator for an ink jet printer |
| DE69115665T2 (en) * | 1990-07-10 | 1996-06-13 | Fujitsu Ltd | PRINT HEAD |
| EP0550030B1 (en) * | 1991-12-26 | 1998-04-01 | Seiko Epson Corporation | Ink jet recording head and process for forming same |
| US5764257A (en) * | 1991-12-26 | 1998-06-09 | Seiko Epson Corporation | Ink jet recording head |
| US6050679A (en) * | 1992-08-27 | 2000-04-18 | Hitachi Koki Imaging Solutions, Inc. | Ink jet printer transducer array with stacked or single flat plate element |
| DE19626428A1 (en) * | 1996-07-01 | 1998-01-15 | Heinzl Joachim | Droplet cloud generator |
| US6039059A (en) * | 1996-09-30 | 2000-03-21 | Verteq, Inc. | Wafer cleaning system |
| US6135357A (en) * | 1998-11-23 | 2000-10-24 | General Electric Company | Apparatus for atomizing high-viscosity fluids |
| GB0000368D0 (en) * | 2000-01-07 | 2000-03-01 | Xaar Technology Ltd | Droplet deposition apparatus |
| US6675914B2 (en) * | 2002-02-19 | 2004-01-13 | Halliburton Energy Services, Inc. | Pressure reading tool |
| US7514048B2 (en) * | 2002-08-22 | 2009-04-07 | Industrial Technology Research Institute | Controlled odor generator |
| JP2004337734A (en) * | 2003-05-15 | 2004-12-02 | Seiko Epson Corp | Liquid discharging head and its manufacturing method |
| EP1792662A1 (en) * | 2005-11-30 | 2007-06-06 | Microflow Engineering SA | Volatile liquid droplet dispenser device |
| EP1952896B1 (en) * | 2007-02-01 | 2012-11-07 | EP Systems SA | Droplet dispenser |
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| US3211088A (en) * | 1962-05-04 | 1965-10-12 | Sperry Rand Corp | Exponential horn printer |
| US3373437A (en) * | 1964-03-25 | 1968-03-12 | Richard G. Sweet | Fluid droplet recorder with a plurality of jets |
| US3679132A (en) * | 1970-01-21 | 1972-07-25 | Cotton Inc | Jet stream vibratory atomizing device |
| US3700169A (en) * | 1970-10-20 | 1972-10-24 | Environment One Corp | Process and appratus for the production of hydroelectric pulsed liquids jets |
| SE349676B (en) * | 1971-01-11 | 1972-10-02 | N Stemme |
-
1974
- 1974-01-10 US US432260A patent/US3900162A/en not_active Expired - Lifetime
- 1974-11-06 GB GB416674A patent/GB1433861A/en not_active Expired
- 1974-11-19 CH CH1536474A patent/CH575835A5/xx not_active IP Right Cessation
- 1974-11-20 CA CA214,237A patent/CA1015022A/en not_active Expired
- 1974-12-05 FR FR7441664A patent/FR2257356B1/fr not_active Expired
- 1974-12-13 IT IT30505/74A patent/IT1027647B/en active
- 1974-12-20 BE BE151811A patent/BE823707A/en not_active IP Right Cessation
- 1974-12-23 NL NL7416761A patent/NL7416761A/en not_active Application Discontinuation
- 1974-12-24 JP JP14771474A patent/JPS5517708B2/ja not_active Expired
-
1975
- 1975-01-01 AR AR257259A patent/AR206417A1/en active
- 1975-01-07 SE SE7500103A patent/SE402551B/en unknown
- 1975-01-09 DK DK4175A patent/DK146198C/en not_active IP Right Cessation
- 1975-01-09 BR BR155/75A patent/BR7500155A/en unknown
- 1975-04-30 ES ES437355A patent/ES437355A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE402551B (en) | 1978-07-10 |
| DK4175A (en) | 1975-08-25 |
| FR2257356A1 (en) | 1975-08-08 |
| GB1433861A (en) | 1976-04-28 |
| IT1027647B (en) | 1978-12-20 |
| CH575835A5 (en) | 1976-05-31 |
| SE7500103L (en) | 1975-07-11 |
| US3900162A (en) | 1975-08-19 |
| ES437355A1 (en) | 1976-12-16 |
| JPS50103936A (en) | 1975-08-16 |
| CA1015022A (en) | 1977-08-02 |
| JPS5517708B2 (en) | 1980-05-13 |
| AU7530974A (en) | 1976-05-13 |
| DE2455854B2 (en) | 1976-07-22 |
| FR2257356B1 (en) | 1976-12-31 |
| DK146198C (en) | 1984-01-16 |
| AR206417A1 (en) | 1976-07-23 |
| NL7416761A (en) | 1975-07-14 |
| DE2455854A1 (en) | 1975-07-17 |
| BR7500155A (en) | 1975-11-04 |
| BE823707A (en) | 1975-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |