EP0461938B1 - Méthode d'enregistrement à jet d'encre et appareil d'enregistrement à jet d'encre l'utilisant - Google Patents

Méthode d'enregistrement à jet d'encre et appareil d'enregistrement à jet d'encre l'utilisant Download PDF

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Publication number
EP0461938B1
EP0461938B1 EP91305468A EP91305468A EP0461938B1 EP 0461938 B1 EP0461938 B1 EP 0461938B1 EP 91305468 A EP91305468 A EP 91305468A EP 91305468 A EP91305468 A EP 91305468A EP 0461938 B1 EP0461938 B1 EP 0461938B1
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EP
European Patent Office
Prior art keywords
transducer elements
group
ink jet
jet recording
electrothermal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91305468A
Other languages
German (de)
English (en)
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EP0461938A3 (en
EP0461938A2 (fr
Inventor
Junji c/o CANON KABUSHIKI KAISHA Shimoda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0461938A2 publication Critical patent/EP0461938A2/fr
Publication of EP0461938A3 publication Critical patent/EP0461938A3/en
Application granted granted Critical
Publication of EP0461938B1 publication Critical patent/EP0461938B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04543—Block driving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04573—Timing; Delays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/0458—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on heating elements forming bubbles

Definitions

  • the present invention relates to an ink jet recording apparatus usable with an information processing apparatus as an output terminal or an ink jet recording apparatus functioning as a printer unified with an information processing apparatus, more particularly to an ink jet recording apparatus usable with personal computer, wordprocessor, copying machine, facsimile machine or the like. Further particularly, the present invention relates to an ink jet recording apparatus using an electrothermal transducer to produce thermal energy contributable to ejection of the ink in accordance with image information.
  • U.S. Patent No. 4,723,129 An ink jet recording apparatus wherein a liquid droplet is ejected by creation of a bubble corresponding to instantaneous state of change of the liquid by the thermal energy produced by an electrothermal transducer is disclosed in U.S. Patent No. 4,723,129.
  • the U.S. Patent discloses a simultaneous drive system wherein plural electrothermal transducers are simultaneously driven and a non-simultaneous driving system wherein the plural electrothermal transducers are sequentially driven with phase difference to effect recording in an inclined fashion.
  • the similar disclosure is made in Japanese Laid-Open Patent Application No. 109672/1980.
  • the U.S. Patent also discloses what is called a time sharing driving system for a great number of electrothermal transducers.
  • Japanese Laid-Open Patent Application No. 109672/1980 discloses a liquid jet recording method wherein a phase difference is provided between ejections from adjacent orifices.
  • This structure includes an advantage that the driving current is lowered, and therefore, the voltage drop due to the wiring resistance is decreased.
  • this method involves a problem that although the meniscus restoring after ink ejection is quick when a small number of orifices are driven, the restoring is significantly delayed when a great number of orifices are driven. For example, the meniscus restoring frequency of 9 kHz during small number driving is reduced to 5 kHz when a great number of orifices are driven. Therefore, the lower frequency is set as the driving frequency of the apparatus.
  • a concern of the present invention is to provide an ink jet recording method and apparatus wherein the liquid droplet formation frequency is increased compared with the known art.
  • Another concern of the present invention is to provide an ink jet recording method and apparatus wherein in addition to the increase in the frequency the accuracy of the ejected positions of the recording liquid droplets is improved.
  • an ink jet recording method for an ink jet recording apparatus comprising a plurality of electrothermal transducer elements for producing thermal energy for ejecting ink and driving means for supplying electric energy to the electrothermal transducer elements in accordance with data to be recorded and a control signal, wherein the electrothermal transducers are grouped into a plurality of groups, and the elements of each group are simultaneously driven by the driving means, characterised by supplying electric power to said electrothermal transducer elements in a group during the interval between maximum expansion of a bubble in a previously driven group and the expiration thereof.
  • an ink jet recording apparatus for an ink jet recording apparatus comprising a plurality of electrothermal transducer elements for producing thermal energy for ejecting recording liquid; and driving means for supplying electric energy to the electrothermal transducer elements in accordance with data to be recorded and a control signal, wherein the electrothermal transducers are grouped into a plurality of groups, and the elements of each group are simultaneously driven by the driving means, characterised in that said driving means are so adapted that the electrothermal transducer elements in a group are supplied with electric power in a period between maximum expansion of a bubble in a previously driven group and the expiration thereof.
  • the print frequency is increased, and the deviation of the ink shot positions are improved, and therefore, the print quality is improved.
  • FIG 8 is a perspective view of an ink jet recording head to which the present invention is applicable.
  • Designated by a reference numeral 11 is a heat generating portion (heat generating element) of an electrothermal transducer producing thermal energy contributable to ejection of the recording liquid (ink) by creating a bubble, when the electrothermal transducer is supplied with electric energy.
  • the heater 11 is formed on a substrate 11 through the process similar to the semiconductor manufacturing process.
  • the recording head further comprises ejection outlets (orifices) 13 through which the recording liquid is ejected, ink passages (nozzles) 14 communicating with the respective ejection outlets 13, and ink passage constituting member 15 for constituting the ejection outlets and the ink passages 14.
  • the recording head further comprises a top plate 16, a common liquid chamber 17 commonly communicating with the ink passages 14, and is effective to accommodate the ink supplied from an unshown ink supply source.
  • FIG 3 is a block diagram of an example of a drive control system for the ink jet recording head having a structure shown in Figure 8.
  • the control system comprises a head driving circuit 21, a head driving source 22, a timing generating circuit 23, a recording data dividing circuit 24, a recording data drive timing generating circuit 25.
  • the timing generating circuit 23 is responsive to the data to be recorded and control signals C1 and C2 from the drive timing generating circuit 25 to generate a pulse width setting signal ENB and selection signals SEL1, SEL2, SEL3 and SEL4 for selecting the latching positions of the input record data to select the electrothermal transducer elements to be driven and to produce a latching signal LAT2.
  • the record data dividing circuit 24 extracts and reforms the record data for one line to supply it to the recording head driver IC26.
  • Figure 4 shows the drive timing in this embodiment.
  • the record data SI1 for one line constituted by the same bit number as the number of electrothermal transducer elements are reintroduced into record data SI2 corresponding to the electrothermal transducer elements which are simultaneously driven by the record data dividing circuit, and are transferred to the recording head. Thereafter, the data are read in the latching circuit in the driver IC selected by the selection signals SEL1 - SEL4 in accordance with the input of the latching signal LAT2. Then, the electrothermal transducers selected by the input of the ENB signal are supplied with the electric energy.
  • the data transfer, selection signal application and the pulse width setting signal application are repeated for a predetermined number of times to effect the printing for one line.
  • FIG. 2 illustrates the order of nozzle drives in this embodiment.
  • the ink jet recording head 41 ejects the recording droplet 42.
  • the nozzles of the ink jet recording head are grouped into four groups. As shown in the Figure, the electrothermal transducers therefor in each of the groups are driven in the order of No. 1, No. 2, No. 3 and No. 4 with a time difference T ⁇ .
  • Figure 1 shows the relation between the drive pulse time difference T ⁇ of the electrothermal transducers in a group and an average response frequencies of the nozzles (measured on the basis of all ejections).
  • the response frequency is substantially maximum within a range between a maximum bubble expansion and collapse and expiration thereof. Therefore, at the time of maximum size of the bubble, the next electrothermal transducer is preferably supplied with the electric energy, by which the response frequency of the nozzles is improved.
  • the points of time for the maximum expansion of the bubble and the points of the time for the collapse of the bubble are different if the driving pulse width is different (3 micro-sec and 7 micro-sec). Therefore, noting the formation of the bubble, the meniscus vibrates reciprocally in the liquid passage after the expiration of the bubble in the sequential drive. The reciprocation is influential to adjacent nozzle or nozzles. Therefore, if the next drive is started during the period in which the ink flow in the previously driven passage is in one direction, the response frequency is increased, and the ejection is stabilized, because the instability factor is significantly reduced.
  • the further preferable condition will be considered. Even in the above preferable range, the response frequency decreases if the time difference T ⁇ is further longer. In addition, the positions of the shots of the recording liquid droplets are slightly deviated, and therefore, the printing quality is slightly deteriorated.
  • the further preferable condition is that the time difference is not more than 20 micro-sec.
  • the upper limit is the maximum bubble expansion point in the previous drive.
  • the energization starts in a period from the maximum expansion and the collapse or expiration of the bubble provided by the previous energization. Further preferably, the energization is started after 4 micro-sec elapses from the maximum expansion, or further preferably after 10 micro-sec elapses thereafter.
  • the electrothermal transducers are supplied with driving pulses in the order of 1, 3, 2 and 4, or as shown in Figure 7, they may be driven in the order of 1, 2, 4 and 3.
  • the response frequency can be improved by starting application of energization pulse in the period between the maximum bubble expansion to the collapse of the bubble.
  • the plural electrothermal transducer elements are grouped into n groups in each of which the electrothermal transducers are simultaneously driven, and the groups are sequentially driven with a time difference.
  • the electrothermal transducers in a given group are simultaneously driven in a period from the maximum expansion of the bubbles in the previously energized group to the collapse or expiration of the bubbles thereof.
  • the ink jet recording head 41 ejects the ink droplet along a path 42.
  • the nozzles of the ink jet recording head is grouped into four groups.
  • the electrothermal transducers for the passages are sequentially driven with the time differences T ⁇ in the order of No. 1, No. 3, No. 2 and No. 4.
  • the numerals in the parentheses in Figure 7 designate the order of drive in each of the groups of electrothermal transducer element.
  • the first electrothermal transducer is driven; and then the second electrothermal transducer is driven (time difference T ⁇ between adjacent pulses).
  • the fourth electrothermal transducer is driven, and the third electrothermal transducer is driven. Therefore, adjacent electrothermal transducers are not simultaneously driven within each of the groups and between adjacent groups.
  • Figure 6B is a sectional view of an ink passage of an ink jet recording head, showing a planar heat generating element 11, wherein the ejection outlet is smaller than the liquid passage in the cross-sectional area.
  • the area of the heat generating element is 3790.5 micron2 (133x28.5), for example.
  • a distance La from a downstream end of the heat generating element to the orifice with respect to the direction of ejecting flow of the ink, is 120 microns.
  • the recording head is of a type wherein the direction of the ejection of the ink is substantially parallel with the heat generating surface. However, when they are not parallel, the present invention applies by defining the distance La as the minimum distance between the ejection outlet 13 and the heat generating element 11.
  • a distance form an upstream end of the heat generating element to an upstream end of the ink passage (supply port 13A) Lb with respect to the direction of the flow of the ejecting ink has been found to be significantly influential to the frequency of the recording droplet formations, and therefore, the printing speed.
  • the distance Lb is the minimum distance between the supply port 13A and the heat generating element 11.
  • Figure 5 is a graph showing a relation between a meniscus restoring frequency f r (refilling frequency) and the distance Lb when all of the nozzle are simultaneously actuated or driven.
  • the solid line in this graph represents the frequency f r when the heat generating elements of Figure 6 are sequentially driven in the order of the arrangement thereof with the rest period T ⁇ 13 micro-sec in the time sharing drive.
  • the broken line in the graph represents the frequency f r when the time difference T ⁇ is 0, that is, the heat generating elements are driven in a non-time-sharing fashion.
  • a plot A1 indicates 6.3 kHz at 70 microns; A2, 5 kHz at 90 microns; A3, 4.35 kHz at 110 microns. The tendency is similar in the case of the driving order shown in Figures 7A and 2.
  • the frequency f r is increased, and that the frequency is a significantly increased by satisfying Lb ⁇ 110 microns, so that the recording speed is remarkably improved.
  • the distance Lb is not more than 70 microns, since then the frequency is larger than the frequency in the case of the simultaneous driving.
  • the distance La is preferably 120 microns in this case.
  • the distance La is preferably not less than 110 microns.
  • the distance La is preferably not more than 130 microns.
  • the distance La is preferably larger than the distance Lb, since then, the quantities of the ejected liquid is uniform.
  • the advantageous effects of the present invention are provided even if the sequentially driven electrothermal transducers are not adjacent, but if they are closely arranged (nozzles 1 and 3, 2 and 4 in Figures 7A and 7C; nozzles 2 and 4 in Figures 8A and 8C).
  • the advantageous effects are remarkable particularly when the distance between centers of the heat generating portions of the electrothermal transducers simultaneously driven is not more than 100 microns, further particularly when it is not more than 80 microns.
  • the advantage of the present invention increases with increase of the number of groups of liquid passages and therefore electrothermal transducers. Particularly when the number of groups is not less than 48, the difference between the simultaneous drive and the drive in accordance with the present invention is remarkable. Also, the present invention is particularly advantageous when the ejection outlets are arranged at high density. From the standpoint of the stabilization of the ejecting performance, the heat generating surface area of the heat generating element is preferably not more than 4190 micron2 and not less than 3390 micron2.
  • the printing quality is guaranteed over a range having a smaller distance Lb, as compared with the nozzle shown in Figure 1B, by the increase of the impedance by the flow resistance element. More particularly, if Lb ⁇ 30 microns, the good printing is assured for a long period of time at a high printing speed.
  • the driving pulse of the driving signal in this embodiment preferably has the major disclosed in U.S. Patents Nos. 4,463,359 and 4,345,262. Further preferably, the conditions disclosed in U.S. Patent No. 4,313,124 relating to the temperature increase of the heat generating surface are used.
  • the advantageous effects of the present invention are significant when the present invention is used in a full-line type recording head.
  • the full-line recording head may be of a type of plural recording heads covering as a whole the entire length of the maximum recording line, and a type wherein one recording head covers the entire line.
  • the present invention is applicable to the recording head of a exchangeable chip type wherein when the chip is mounted, it is electrically connected with the apparatus and it is capable of being supplied with the recording liquid from the main apparatus, or a cartridge type recording head having an ink supply source.
  • the present invention is particularly advantageously usable with an ink jet recording apparatus or head wherein the print data to the plural electrothermal transducer elements are divided and transferred for each plurality of bits, and the adjacent electrothermal transducers are driven with time difference sequentially.
  • the actuatable recording frequency can be increased, and therefore, the recording speed can be increased.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Ink Jet (AREA)

Claims (11)

  1. Procédé d'enregistrement par jets d'encre pour un appareil d'enregistrement à jets d'encre comportant plusieurs éléments transducteurs électrothermiques destinés à produire de l'énergie thermique pour éjecter de l'encre et des moyens d'attaque destinés à fournir de l'énergie électrique aux éléments transducteurs électrothermiques en fonction de données devant être enregistrées et d'un signal de commande, dans lequel les transducteurs électrothermiques sont groupés en plusieurs groupes, et les éléments de chaque groupe sont attaqués simultanément par les moyens d'attaque,
       caractérisé par l'application d'énergie électrique auxdits éléments transducteurs électrothermiques d'un groupe pendant l'intervalle entre une expansion maximale d'une bulle (42) dans un groupe précédemment attaqué, et son expiration.
  2. Procédé selon la revendication 1, caractérisé en ce que l'excitation d'un élément excité plus tard a lieu avant la fin de l'affaissement de la bulle formée par un élément excité plus tôt.
  3. Appareil d'enregistrement à jets d'encre pour un appareil d'enregistrement à jets d'encre, comportant :
       plusieurs éléments transducteurs électrothermiques (7) destinés à produire de l'énergie thermique pour éjecter un liquide d'enregistrement ; et
       des moyens d'attaque (4, 5, 22, 23, 24, 25) destinés à fournir de l'énergie électrique aux éléments transducteurs électrothermiques (7, 11) en fonction de données devant être enregistrées et d'un signal de commande, dans lequel les transducteurs électrothermiques sont groupés en plusieurs groupes, et les éléments de chaque groupe sont attaqués simultanément par les moyens d'attaque, caractérisé en ce que
       lesdits moyens d'attaque sont conçus de manière que les éléments transducteurs électrothermiques (7, 11) d'un groupe soient alimentés en énergie électrique pendant une période comprise entre une expansion maximale d'une bulle d'un groupe précédemment attaqué et son expiration.
  4. Appareil selon la revendication 3, caractérisé en ce que lesdits moyens d'attaque sont conçus de manière que l'excitation d'un élément postérieur ait lieu avant l'affaissement de la bulle formée par un élément antérieur.
  5. Appareil selon la revendication 3 ou 4, caractérisé en ce qu'une différence de temps entre l'alimentation en énergie électrique d'un groupe et celle d'un groupe suivant est inférieure à 25 microsecondes.
  6. Appareil selon la revendication 3 ou 4, caractérisé en ce qu'une différence de temps entre l'alimentation en énergie électrique d'un groupe et celle d'un groupe suivant est de 20 microsecondes ou moins.
  7. Appareil selon la revendication 3, caractérisé en ce que ladite énergie électrique est appliquée à environ 4 microsecondes après ladite expansion maximale.
  8. Appareil selon la revendication 3, caractérisé en ce que ladite énergie électrique est appliquée à environ 10 microsecondes après ladite expansion maximale.
  9. Appareil selon l'une quelconque des revendications 3-8, caractérisé en ce que lesdits transducteurs électrothermiques (11) sont logés dans des buses (13), respectivement.
  10. Procédé selon la revendication 1 ou 2, dans lequel lesdits éléments transducteurs sont groupés de manière que deux éléments transducteurs adjacents quelconques ne soient pas attaqués simultanément.
  11. Appareil selon l'une quelconque des revendications 3-9, dans lequel lesdits éléments transducteurs sont groupés de manière que deux éléments transducteurs adjacents quelconques ne soient pas attaqués simultanément.
EP91305468A 1990-06-15 1991-06-17 Méthode d'enregistrement à jet d'encre et appareil d'enregistrement à jet d'encre l'utilisant Expired - Lifetime EP0461938B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15700190 1990-06-15
JP157001/90 1990-06-15

Publications (3)

Publication Number Publication Date
EP0461938A2 EP0461938A2 (fr) 1991-12-18
EP0461938A3 EP0461938A3 (en) 1992-04-08
EP0461938B1 true EP0461938B1 (fr) 1996-03-13

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EP91305468A Expired - Lifetime EP0461938B1 (fr) 1990-06-15 1991-06-17 Méthode d'enregistrement à jet d'encre et appareil d'enregistrement à jet d'encre l'utilisant

Country Status (4)

Country Link
EP (1) EP0461938B1 (fr)
AT (1) ATE135300T1 (fr)
DE (1) DE69117810T2 (fr)
ES (1) ES2084108T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3262363B2 (ja) * 1991-04-26 2002-03-04 キヤノン株式会社 インクジェット記録装置
EP0592221B1 (fr) * 1992-10-08 2005-02-16 Hewlett-Packard Company, A Delaware Corporation Tête d'impression avec des connexions réduites vers une imprimante
JP3323597B2 (ja) * 1993-09-03 2002-09-09 キヤノン株式会社 インクジェットヘッド用基体、該基体を用いたインクジェットヘッドおよびインクジェットプリント装置
US6243111B1 (en) 1993-09-02 2001-06-05 Canon Kabushiki Kaisha Print head substrate, print head using the same, and printing apparatus
JP2967052B2 (ja) * 1995-09-08 1999-10-25 キヤノン株式会社 カラーフィルタの製造方法及び製造装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55109672A (en) * 1979-02-15 1980-08-23 Canon Inc Ink jet recording method
EP0103943A3 (fr) * 1982-09-20 1985-09-18 Hewlett-Packard Company Procédé et dispositif d'élimination des effets de diaphonie acoustique dans une imprimante à jet d'encre thermique
EP0318328B1 (fr) * 1987-11-27 1993-10-27 Canon Kabushiki Kaisha Dispositif d'enregistrement par jet d'encre

Also Published As

Publication number Publication date
EP0461938A3 (en) 1992-04-08
EP0461938A2 (fr) 1991-12-18
DE69117810T2 (de) 1996-08-08
ATE135300T1 (de) 1996-03-15
ES2084108T3 (es) 1996-05-01
DE69117810D1 (de) 1996-04-18

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