EP0775580A2 - Druckkopf für eine mit Bläschen angetriebene Tintenstrahldruckvorrichtung - Google Patents

Druckkopf für eine mit Bläschen angetriebene Tintenstrahldruckvorrichtung Download PDF

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Publication number
EP0775580A2
EP0775580A2 EP96308587A EP96308587A EP0775580A2 EP 0775580 A2 EP0775580 A2 EP 0775580A2 EP 96308587 A EP96308587 A EP 96308587A EP 96308587 A EP96308587 A EP 96308587A EP 0775580 A2 EP0775580 A2 EP 0775580A2
Authority
EP
European Patent Office
Prior art keywords
heat generating
print head
jet printer
bubble jet
electrodes
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.)
Withdrawn
Application number
EP96308587A
Other languages
English (en)
French (fr)
Other versions
EP0775580A3 (de
Inventor
Seung-Jin Kim
Kyoung-Won Na
Woo-Yong Lee
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
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
Priority claimed from KR1019950043906A external-priority patent/KR970025962A/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0775580A2 publication Critical patent/EP0775580A2/de
Publication of EP0775580A3 publication Critical patent/EP0775580A3/de
Withdrawn legal-status Critical Current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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14072—Electrical connections, e.g. details on electrodes, connecting the chip to the outside...
    • 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
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14088—Structure of heating means
    • B41J2/14112—Resistive element
    • B41J2/1412—Shape

Definitions

  • the present invention relates to a print head for a bubble jet printer, and more particularly, to a print head for a bubble jet printer which enables gray scale printing.
  • a printing apparatus in which ink is discharged by heat-generated bubbles is called a bubble jet printer. That is, in the bubble jet printer, the ink is discharged via a nozzle formed in the print head by bubbles created by heating the ink by a heat generating unit installed in the print head. Accordingly, text and/or graphics can be printed on a paper. In the general print head of a bubble jet printer, ink is discharged in constant amounts.
  • a print head for a bubble jet printer for improving print quality is disclosed in U.S. Patent No. 4,339,762 by Yoshiaki et al.
  • the print head proposed by yoshiaki et al. has a structure in which a grooved member 10 and a substrate 20 are connected to each other and ink is discharged from spaces formed therebetween.
  • the grooved member 10 has a plurality of grooves 11a, 11b, 11c, 11d, 11e and 11f which are arranged longitudinally at predetermined intervals placed between a plurality of contact surfaces 12a, 12b, 12c, 12d, 12e, 12f and 12g.
  • the substrate 20 has a plurality of contact layers 24 arranged opposite the contact surfaces 12a to 12g, a plurality of electrodes 23a, 23b, 23c, 23d, 23e and 23f to which current is applied and a heat generating member 22, wherein the electrodes and the heat generating member 22 are placed between the contact layers 24. Also, there is a common electrode 21 on the substrate 20 for applying current to the heat generating member 22.
  • the above print head has a complicated structure in which the volume of ink is controlled by changes of applied pulses, so that the manufacturing process therefor is difficult.
  • each area of electrodes corresponding to a plurality of heat generating units is different, so that the heat generating units are of different sizes. Accordingly, the size of the discharged ink bubble is controlled, thereby providing an effect to improve the print quality.
  • this technology requires a nozzle for each heat generating unit, So that integration of the print head is difficult and the manufacturing process of the head is complicated.
  • a print head for a bubble jet printer comprising : a substrate having a predetermined ink chamber into which ink is supplied, a nozzle plate having a plurality of nozzles disposed above the substrate; a plurality or electrodes attached to the substrate; and a heat generating unit having a plurality of heat generating subunits each connected to the plurality of electrodes.
  • each nozzle corresponds to the plurality of heat generating subunits.
  • the surface areas of the heat generating subunits are different.
  • the electrodes comprise: a common electrode connected to one end of at least one of the heat generating subunits; a coupling electrode for coupling the other end of the heat generating subunit connected to the common electrode to ends of the heat generating subunits which are not connected to the common electrode; and a connection electrode connected to the other ends of the heat generating subunits which are not connected to the common electrode.
  • the heat generating area may be changed by selecting the electrodes connected to the heat generating units, thereby varying the size of bubbles.
  • the print head for the bubble jet printer according to the present invention can control the size of bubbles to control the amount of discharged ink, so that gray scale printing can be attained.
  • FIG. 3 one cell of a print head for a bubble jet printer according to the present invention is shown.
  • the print head has a nozzle plate having a plurality of nozzles, a substrate, a plurality of ink chambers formed on the substrate, a plurality of electrodes attached to the substrate, and a plurality of heat generating units connected to said plurality of electrodes.
  • FIGS. 3 and 4 show one cell of the print head for the bubble jet printer according to the present invention, a nozzle 31 formed on a nozzle plate 30 and a substrate 40 for forming a predetermined chamber 50 into which ink 111 is supplied. Opposite the nozzle 31 and on the substrate 40, there are a plurality of electrodes 70 to which a predetermined current is applied. Between the electrodes and the substrate 40, there is an insulation layer 80. Also, there is a heat generating unit 60 appropriately connected to the electrodes 70 on the insulation layer 80.
  • the set of electrodes includes one common electrode and several coupling electrodes.
  • the electrodes 70 include a common electrode 71, first, second and third coupling electrodes 72, 73 and 74, and first, second and third connection electrodes 75, 76 and 77.
  • the heat generating unit 60 includes first through sixth heat generating subunits 61 through 66.
  • the common electrode 71 is connected to one end of the fourth, fifth and sixth heat generating subunits 64, 65 and 66, and the first, second and third connection electrodes 75, 76 and 77 are connected to an end of each of the first, second and third heat generating subunits 61, 62 and 63, respectively.
  • the first coupling electrode 72 couples the first and sixth heat generating subunits 61 and 66
  • the second coupling electrode 73 couples the second and fifth heat generating subunits 62 and 65
  • the third coupling electrode 74 couples the third and fourth heat generating subunits 63 and 64.
  • the heat generating area of the heat generating unit 60 changes when the heat generating subunits have different areas one another. That is, the first and sixth heat generating subunits 61 and 66 are simultaneously heated when power is applied to the first connection electrode 75, the second and fifth heat generating subunits 62 and 65 are simultaneously heated when power is applied to the second connection electrode 76, and the third and fourth heat generating subunits 63 and 64 are simultaneously heated when power is applied to the third connection electrode 77.
  • the first and sixth heat generating subunits 61, 66 or the first, second, fifth and sixth heat generating subunits 61, 62, 65, 66 or the first, second, third, fourth, fifth, and sixth heat generating subunits 61, 62, 63, 64, 65, 66 are heated respectively.
  • selecting the number of connection electrodes from the heat generating unit can change the number of the heat generating subunits resulting in the modulation of the heat generating area.
  • the electrodes 70 connected to the heat generating unit 60, the first through sixth heat generating subunits 61 to 66, can be arranged in the same plane without being overlapped. If the heat generating unit 60 is manufactured by overlapping the heat generating subunits 61 to 66, the manufacturing cost is increased and the manufacturing process is complicated.
  • the nozzle 31 and the heat generating unit 60 are positioned opposite each other such that the ink discharge direction through the nozzle 31 is perpendicular to the surface of heat generating unit 60.
  • a nozzle 53 may be formed at one end of the ink chamber 50 such that the surface of heat generating unit 60 is co-linear to the ink discharge direction through the nozzle 53. In this case, the direction of the nozzle 53 is perpendicular to the plane of the heat generating unit 60.
  • a protection layer 55 (see FIG. 3) for protecting the heat generating unit 60 from the ink 111, made of a compound including Ta, Si 3 N 4 and SiC, is formed on the heat generating unit 60.
  • the heat generating subunits 61-66 of the heat generating unit 60 may be made of Ta-Al alloy or HfB 2
  • the electrodes 70 may be made of Al-Cu alloy.
  • ink bubbles of varying sizes may be obtained by varying the sizes of heat generating subunits 61', 62' and 63' as shown in FIG. 5.
  • a pixel formed of four dots having a matrix structure can be printed in eleven scales of gray as shown in FIG. 7. That is, when a pixel is printed while the dots form a matrix structure, for example, when a pixel comprised of a 2x2 matrix and having two dot sizes whose diameter ratio is 1:3, is used, printing in eleven gray scales can be attained.
  • the heating area of the heat generating unit is controlled, so that the size of the ink bubbles discharged via a nozzle can be controlled. As a result, the printing can be attained in various gray scales.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP96308587A 1995-11-27 1996-11-27 Druckkopf für eine mit Bläschen angetriebene Tintenstrahldruckvorrichtung Withdrawn EP0775580A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1019950043906A KR970025962A (ko) 1995-11-27 1995-11-27 잉크제트 프린팅장치
KR4390695 1995-11-27
KR4511896 1996-10-10
KR1019960045118A KR100450779B1 (ko) 1995-11-27 1996-10-10 버블제트프린터

Publications (2)

Publication Number Publication Date
EP0775580A2 true EP0775580A2 (de) 1997-05-28
EP0775580A3 EP0775580A3 (de) 1997-10-22

Family

ID=26631426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96308587A Withdrawn EP0775580A3 (de) 1995-11-27 1996-11-27 Druckkopf für eine mit Bläschen angetriebene Tintenstrahldruckvorrichtung

Country Status (2)

Country Link
EP (1) EP0775580A3 (de)
JP (1) JPH09164683A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1356937A3 (de) * 2002-04-23 2004-01-14 Canon Kabushiki Kaisha Tintenstrahlkopf
US6749290B2 (en) 2001-09-04 2004-06-15 Canon Kabushiki Kaisha Recording unit, image recording apparatus and image recording method
WO2019044631A1 (en) * 2017-08-31 2019-03-07 Canon Kabushiki Kaisha APPARATUS FOR MANUFACTURING LIQUID CONTAINING EXTRAFINE BUBBLES AND METHOD OF MANUFACTURING

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970025962A (ko) * 1995-11-27 1997-06-24 김광호 잉크제트 프린팅장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339762A (en) 1979-04-02 1982-07-13 Canon Kabushiki Kaisha Liquid jet recording method
US4503444A (en) 1983-04-29 1985-03-05 Hewlett-Packard Company Method and apparatus for generating a gray scale with a high speed thermal ink jet printer
US5121143A (en) 1988-09-14 1992-06-09 Graphtec Corp. Ink printing head with variable-size heat elements

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945658A1 (de) * 1978-11-14 1980-05-29 Canon Kk Fluessigkeitsstrahl-aufzeichnungsverfahren
EP0124312A3 (de) * 1983-04-29 1985-08-28 Hewlett-Packard Company Widerstandsanordnungen für thermische Tintenstrahldrucker
US4965594A (en) * 1986-02-28 1990-10-23 Canon Kabushiki Kaisha Liquid jet recording head with laminated heat resistive layers on a support member
JPS62261452A (ja) * 1986-05-09 1987-11-13 Canon Inc 多値化記録方式
JP2836749B2 (ja) * 1989-05-09 1998-12-14 株式会社リコー 液体噴射記録ヘッド
JPH03239563A (ja) * 1990-02-17 1991-10-25 Mitsubishi Electric Corp サーマルヘツド

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339762A (en) 1979-04-02 1982-07-13 Canon Kabushiki Kaisha Liquid jet recording method
US4503444A (en) 1983-04-29 1985-03-05 Hewlett-Packard Company Method and apparatus for generating a gray scale with a high speed thermal ink jet printer
US5121143A (en) 1988-09-14 1992-06-09 Graphtec Corp. Ink printing head with variable-size heat elements

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"SPSE Third International Congress on Advances in Non-Impact Printing Technologies, San Francisco, Aug. 24-28, 1986", 1986, article SUZUKI ET AL.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6749290B2 (en) 2001-09-04 2004-06-15 Canon Kabushiki Kaisha Recording unit, image recording apparatus and image recording method
EP1356937A3 (de) * 2002-04-23 2004-01-14 Canon Kabushiki Kaisha Tintenstrahlkopf
US6984025B2 (en) 2002-04-23 2006-01-10 Canon Kabushiki Kaisha Ink jet head
WO2019044631A1 (en) * 2017-08-31 2019-03-07 Canon Kabushiki Kaisha APPARATUS FOR MANUFACTURING LIQUID CONTAINING EXTRAFINE BUBBLES AND METHOD OF MANUFACTURING
US11938503B2 (en) 2017-08-31 2024-03-26 Canon Kabushiki Kaisha Ultrafine bubble-containing liquid manufacturing apparatus and manufacturing method

Also Published As

Publication number Publication date
EP0775580A3 (de) 1997-10-22
JPH09164683A (ja) 1997-06-24

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