EP0030382A1 - Tête d'écriture pour dispositif d'écriture à mosaique d'encre - Google Patents

Tête d'écriture pour dispositif d'écriture à mosaique d'encre Download PDF

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Publication number
EP0030382A1
EP0030382A1 EP80107675A EP80107675A EP0030382A1 EP 0030382 A1 EP0030382 A1 EP 0030382A1 EP 80107675 A EP80107675 A EP 80107675A EP 80107675 A EP80107675 A EP 80107675A EP 0030382 A1 EP0030382 A1 EP 0030382A1
Authority
EP
European Patent Office
Prior art keywords
writing
nozzle openings
channel
nozzle
ink
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Withdrawn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
EP80107675A
Other languages
German (de)
English (en)
Inventor
Günter Dipl.-Ing. Rosenstock
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0030382A1 publication Critical patent/EP0030382A1/fr
Withdrawn legal-status Critical Current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
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • 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
    • B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber

Definitions

  • the invention relates to an arrangement for a writing head in ink mosaic writing devices with channels running in the writing head and containing the writing liquid, through the ends of which facing the writing point, liquid droplets are expelled under the action of an electromechanical transducer.
  • writing heads are known in which a number of writing channels run between an ink supply area and a writing point. With a corresponding excitation, ink is pressed through the writing channel and is thus ejected in the form of individual ink droplets.
  • Piezoelectric transducer elements are known as drive elements which, for example, partially enclose the channels in a cylindrical manner and, when actuated by means of suitable electrical impulses by contraction and expansion, bring about a change in pressure in the relevant channel.
  • Such a write head is described in DE-OS 25 45 451.
  • the print head specified there contains, for example, twelve channels, the twelve openings of which form two parallel rows, each with six nozzles. With such a writing head, it is possible to record any characters, for example within a 12x9 grid, on a recording medium.
  • ink and paper with poor flow properties can be used, but it is shown that the spread of the ink droplets sprayed onto the paper is then reduced. The result is that the punctiform grid of the individual characters is visible and that the typeface appears uneasy overall, since the overlapping of the individual droplets that form a character is no longer guaranteed.
  • An increase in output that counteracts these effects Ink droplets or a narrower division of the writing nozzles is associated with considerable effort. For example, increasing the size of the ink droplets leads to higher ink consumption, longer drying times, higher shock sensitivity of the nozzles and poorer droplet formation due to the formation of satellite droplets. Reducing the pitch of the writing nozzles requires a higher number of channels inside the writing head and thus leads to an increase in the manufacturing costs.
  • the invention is based on the object of specifying an arrangement for a write head for ink mosaic writing devices which, without increasing the number of write channels running in the write head, permits the use of writing fluid with reduced flow properties, the use of which does not depend on the quality of the paper used, and with which the font quality is significantly improved.
  • the solution according to the invention is characterized in that at least two nozzle openings are provided for each channel.
  • the solution according to the invention there is advantageously the possibility, at least in the vertical writing direction, of generating very fine lines which can be widened if necessary. This gives you the option of displaying characters in the so-called shadow font. Due to the almost exact, circular shape of the individual droplets, it is possible to create characters with high edge sharpness and with a high degree of blackening.
  • the solution according to the invention Achievable reduction of the individual droplet diameters reduces the ink consumption, shortens the drying time and prevents the writing from bleeding through. Since the font quality is no longer dependent on the flow properties of the ink and the writing paper to the usual extent, the solution according to the invention enables the use of paper of any quality.
  • the exemplary embodiment according to FIG. 1 shows a write head 1 produced, for example, by injection molding.
  • a nozzle plate 3 is provided here at the end of the write head 1 facing the writing point.
  • the write channels 2 are arranged, which are aligned away from the nozzle plate 3 without kinks. Ink is pressed in the direction of the nozzle plate 3 via these channels by drive elements, which may be piezoelectric transducers, for example, and droplet-shaped and in pa via the nozzle openings in the nozzle plate 3 parallel flight direction sprayed onto a recording medium, also not shown here.
  • the nozzle plate 3 has two nozzle openings 4 and 5 for each channel 2.
  • the two nozzle openings 4 and 5 are arranged vertically one above the other in the region of each channel 2.
  • each of the nozzle openings 4 and 5 has only about half the diameter.
  • the nozzle plate 3 thus contains an evenly divided row of nozzles with a halved spacing.
  • the ink droplets ejected through these nozzle openings 4, 5 have a smaller diameter than those in known ink writing heads.
  • This arrangement of the nozzle openings 4, 5 in the nozzle plate 3 leads to the fact that when the characters are formed, a halftone dot consists of two ink droplets lying one above the other.
  • the nozzle openings can form two parallel rows, the nozzle openings arranged in the second row being offset by half a pitch from those in the first row.
  • the exemplary embodiment shown in FIG. 2 is based on a write head in which no nozzle plate is used.
  • the ends of the channels 2 running in the write head 1 facing the writing point directly represent the nozzle openings.
  • 2 channels 4 and 5 are assigned to each channel. This can be achieved, for example, by branching each channel into two subchannels in the area of its outlet opening.
  • the number of channels ni increases inside the print head and no additional links are required.
  • the nozzle openings require additional paint.
  • the nozzle openings can, as explained with reference to FIG. 1, either all be arranged in a vertical row, or they can form two parallel rows as shown in FIG. 2.
  • the line width can be increased in a simple manner by suitable control of the drive elements. If each of the drive elements involved in the recording of a character is activated twice, each raster point of the character is composed of four separate droplets, which are represented as a square on the recording medium. The individual ink droplets then overlap in this square and form a sharply outlined and strongly contoured raster element. As an example of this, reference is made to FIG. 3. This example shows a written sample of the letter N, whereby the left vertical line and the diagonal line were formed by a single excitation, the right vertical line by a double excitation of the drive elements. This method is very well suited for representation in the so-called shadow font.
  • FIG. 4 An example of this is shown in FIG. 4, where four channel-shaped nozzle openings are assigned to each channel. This results in a diamond-shaped pattern for each raster point of a character. It is advantageous to arrange the diamond-shaped nozzle openings in two parallel rows and to arrange the bottom nozzle opening of a diamond in the first row and the top nozzle opening of the diamond following in the second row at the same height. In this way, the constrictions that can arise with this arrangement for the vertical lines are increased Lich improved, since then two ink droplets lie on top of each other in the problematic areas of the character and thus an increased ink spread occurs in this area.
  • the arrangement of the nozzle openings given on the basis of FIG. 4 offers advantages especially for the diagonal lines of the characters.
EP80107675A 1979-12-10 1980-12-05 Tête d'écriture pour dispositif d'écriture à mosaique d'encre Withdrawn EP0030382A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2949616 1979-12-10
DE2949616A DE2949616C2 (de) 1979-12-10 1979-12-10 Schreibkopf für Tintenmosaikschreibeeinrichtungen

Publications (1)

Publication Number Publication Date
EP0030382A1 true EP0030382A1 (fr) 1981-06-17

Family

ID=6088042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107675A Withdrawn EP0030382A1 (fr) 1979-12-10 1980-12-05 Tête d'écriture pour dispositif d'écriture à mosaique d'encre

Country Status (7)

Country Link
US (1) US4396924A (fr)
EP (1) EP0030382A1 (fr)
JP (1) JPS5693567A (fr)
CA (1) CA1140390A (fr)
CS (1) CS217985B2 (fr)
DE (1) DE2949616C2 (fr)
ZA (1) ZA807694B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627314A2 (fr) * 1993-05-31 1994-12-07 OLIVETTI-CANON INDUSTRIALE S.p.A. Tête d'impression à jet d'encre améliorée pour imprimante matricielle à points

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57107849A (en) * 1980-12-25 1982-07-05 Nec Corp Ink jet recording device
JPS58116165A (ja) * 1981-12-29 1983-07-11 Canon Inc インク噴射ヘツド
US4528576A (en) * 1982-04-15 1985-07-09 Canon Kabushiki Kaisha Recording apparatus
US4621273A (en) * 1982-12-16 1986-11-04 Hewlett-Packard Company Print head for printing or vector plotting with a multiplicity of line widths
US4714934A (en) * 1985-11-26 1987-12-22 Exxon Research & Engineering Company Apparatus for printing with ink jet chambers utilizing a plurality of orifices
SE8804081D0 (sv) * 1988-11-11 1988-11-11 Scandot System Ab Anordning vid vaetskestraalskrivare
JPH10506068A (ja) 1994-09-23 1998-06-16 データプロダクツ コーポレイション 複数のオリフィスを用いるインクジェットチャンバ付き印刷装置
US5801732A (en) * 1994-09-23 1998-09-01 Dataproducts Corporation Piezo impulse ink jet pulse delay to reduce mechanical and fluidic cross-talk
US5731827A (en) * 1995-10-06 1998-03-24 Xerox Corporation Liquid ink printer having apparent 1XN addressability
US6310639B1 (en) 1996-02-07 2001-10-30 Hewlett-Packard Co. Printer printhead
US6155670A (en) * 1997-03-05 2000-12-05 Hewlett-Packard Company Method and apparatus for improved ink-drop distribution in inkjet printing
US6099108A (en) 1997-03-05 2000-08-08 Hewlett-Packard Company Method and apparatus for improved ink-drop distribution in ink-jet printing
NL1011130C2 (nl) * 1999-01-26 2000-07-27 Oce Tech Bv Inrichting voor het afgeven van inkt.
JP2002331658A (ja) 2001-05-08 2002-11-19 Fuji Xerox Co Ltd インクジェット記録ヘッドおよびインクジェット記録装置
GB0220227D0 (en) * 2002-08-30 2002-10-09 Xaar Technology Ltd Droplet deposition apparatus
US6779861B2 (en) 2002-12-16 2004-08-24 Xerox Corporation Enhanced dot resolution for inkjet printing
US7874654B2 (en) * 2007-06-14 2011-01-25 Hewlett-Packard Development Company, L.P. Fluid manifold for fluid ejection device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2313335A1 (de) * 1973-03-17 1974-09-26 Olympia Werke Ag Vorrichtung zum aufbringen von fluessigkeitstropfen auf eine oberflaeche
GB1412125A (en) * 1972-03-10 1975-10-29 Plessey Co Ltd Display apparatus
DE2429232A1 (de) * 1974-06-18 1976-01-08 Olympia Werke Ag Schreibwerk mit einem mosaikdruckkopf
FR2278496A1 (fr) * 1970-06-29 1976-02-13 Silonics Imprimante a jet d'encre
DE2543451A1 (de) * 1975-09-29 1977-03-31 Siemens Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714928A (en) * 1970-11-17 1973-02-06 Mead Corp Multiple jet channel
CA1012198A (en) * 1974-07-19 1977-06-14 Stephan B. Sears Method and apparatus for recording with writing fluids and drop projection means therefor
US4158847A (en) * 1975-09-09 1979-06-19 Siemens Aktiengesellschaft Piezoelectric operated printer head for ink-operated mosaic printer units
US4131899A (en) * 1977-02-22 1978-12-26 Burroughs Corporation Droplet generator for an ink jet printer
US4216483A (en) * 1977-11-16 1980-08-05 Silonics, Inc. Linear array ink jet assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2278496A1 (fr) * 1970-06-29 1976-02-13 Silonics Imprimante a jet d'encre
GB1412125A (en) * 1972-03-10 1975-10-29 Plessey Co Ltd Display apparatus
DE2313335A1 (de) * 1973-03-17 1974-09-26 Olympia Werke Ag Vorrichtung zum aufbringen von fluessigkeitstropfen auf eine oberflaeche
DE2429232A1 (de) * 1974-06-18 1976-01-08 Olympia Werke Ag Schreibwerk mit einem mosaikdruckkopf
DE2543451A1 (de) * 1975-09-29 1977-03-31 Siemens Ag Piezoelektrisch betriebener schreibkopf fuer tintenmosaikschreibeinrichtungen
FR2325509A1 (fr) * 1975-09-29 1977-04-22 Siemens Ag Tete d'ecriture piezoelectrique pour dispositif d'ecriture a mosaique a encre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627314A2 (fr) * 1993-05-31 1994-12-07 OLIVETTI-CANON INDUSTRIALE S.p.A. Tête d'impression à jet d'encre améliorée pour imprimante matricielle à points
EP0627314A3 (fr) * 1993-05-31 1995-12-06 Olivetti Canon Ind Spa Tête d'impression à jet d'encre améliorée pour imprimante matricielle à points.
US6084609A (en) * 1993-05-31 2000-07-04 Olivetti-Lexikon S.P.A. Ink-jet print head with multiple nozzles per expulsion chamber

Also Published As

Publication number Publication date
US4396924A (en) 1983-08-02
CA1140390A (fr) 1983-02-01
JPS5693567A (en) 1981-07-29
ZA807694B (en) 1981-12-30
DE2949616C2 (de) 1982-12-16
CS217985B2 (en) 1983-02-25
DE2949616A1 (de) 1981-06-11

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Inventor name: ROSENSTOCK, GUENTER, DIPL.-ING.