EP0468068B1 - Apparatus for feeding ink in an ink writing head - Google Patents

Apparatus for feeding ink in an ink writing head Download PDF

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Publication number
EP0468068B1
EP0468068B1 EP19900114171 EP90114171A EP0468068B1 EP 0468068 B1 EP0468068 B1 EP 0468068B1 EP 19900114171 EP19900114171 EP 19900114171 EP 90114171 A EP90114171 A EP 90114171A EP 0468068 B1 EP0468068 B1 EP 0468068B1
Authority
EP
European Patent Office
Prior art keywords
ink
channels
individual channels
compartment
channel structure
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
EP19900114171
Other languages
German (de)
French (fr)
Other versions
EP0468068A1 (en
Inventor
Manfred Lehmann
Karl Bühler
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to EP19900114171 priority Critical patent/EP0468068B1/en
Priority to DE59009749T priority patent/DE59009749D1/en
Publication of EP0468068A1 publication Critical patent/EP0468068A1/en
Application granted granted Critical
Publication of EP0468068B1 publication Critical patent/EP0468068B1/en
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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17563—Ink filters
    • 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
    • B41J2/16—Production of nozzles
    • 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
    • B41J2/16—Production of nozzles
    • B41J2/1621—Manufacturing processes
    • B41J2/1626—Manufacturing processes etching
    • 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
    • B41J2/16—Production of nozzles
    • B41J2/1621—Manufacturing processes
    • B41J2/164—Manufacturing processes thin film formation
    • B41J2/1643—Manufacturing processes thin film formation thin film formation by plating
    • 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
    • B41J2002/14379—Edge shooter
    • 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
    • B41J2002/14403—Structure thereof only for on-demand ink jet heads including a filter

Definitions

  • the invention relates to an arrangement for supplying ink to an ink writing head according to the preamble of patent claim 1.
  • Print heads in ink writing devices essentially have a multiplicity of ink channels which end on the side of the write head facing a recording medium in outlet nozzles and which end at the other end in a common ink chamber. This is connected to an ink reservoir via a supply system.
  • a drive element is assigned to each ink channel, and when actuated individually, a single droplet of ink is ejected.
  • Thermal transducers or piezoceramic transducers are used as drive elements.
  • the supply of ink into the ink chamber and into the individual ink channels is usually carried out capillary or using a slight negative pressure inside the head.
  • the so-called anisotropic etching process is a suitable method for producing such write heads (EP 0 359 417 A2).
  • the individual crystal directions of a substrate body e.g. Silicon, depending on different etching speeds used to form particularly precise contours of different depths.
  • the invention has for its object to ensure filtering of the ink without a separate, i.e. independent filter element must be provided and installed.
  • the ink supply area designed as a channel structure also forms the filter for the ink, that is to say it is an integral part of the writing head, and that the production takes place simultaneously with the formation of the ink channels and the ink chamber of the writing head in one Operation can take place.
  • FIG. 1 shows the sectional view of an ink writing head with an ink supply area according to the invention
  • FIG. 2, FIG. 3 and FIG. 4 each show details of the channel structure according to FIG. 1.
  • the Ink channels 2 and the ink chamber 3 formed, wherein, as described in the introduction, the anisotropic etching process is used.
  • the ink supply area has the channel structure according to the invention, which consists of the individual channels 4 and 5 running in two planes 6 and 7.
  • An ink supply line, not shown here, is connected to the individual channels 4 running in the upper level 6, via which ink is supplied from an ink reservoir, also not shown.
  • This ink reservoir can form a compact unit with the head, so it can be integrated into it; however, it can also be designed as an individual part, for example as an exchangeable ink container which is moved with the head.
  • the individual channels 5 running in the lower level 7 open into the ink chamber 3. This is achieved in that the direction of the individual channels 4 and 5 running in the two levels 6 and 7 is rotated by an angle. In the example, this angle is 90 °.
  • the liquid transport between the individual channels 4 and 5 is ensured by the fact that breakthroughs occur in the areas in which the individual channels of the lower and upper levels intersect. In the usual way, the entire arrangement is closed in a liquid-tight manner by a cover 8, for example made of glass.
  • FIG. 2 shows the course of the individual channels 4 in the upper level 6
  • FIG. 3 shows the course of the individual channels 5 in the lower level 7
  • FIG Individual channels 4 and 5 are carried out with the aid of a line pattern or line grid applied to the substrate body 1 on both sides, which corresponds to the line pattern shown in FIGS. 2 and 3.
  • the grating on one side of the substrate body 1 is rotated by an angle, in the example by an angle of 90 °, with respect to the grating applied on the other side thereof.
  • the channel structure then results in a double-sided etching process.
  • the channel structure according to the invention not only ensures a secure ink connection; Rather, an effective ink filter is also available which, in addition to improved mechanical stability, also has good flow behavior for the ink and which can be produced in a single operation together with the ink channels and the ink chamber.
  • the arrangement according to the invention offers advantages, above all for so-called interchangeable writing heads, since the filter integrated in the head no longer requires special measures when connected to the ink supply system of a writing device.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Description

Die Erfindung betrifft eine Anordnung für die Tintenzuführung in einen Tintenschreibkopf gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to an arrangement for supplying ink to an ink writing head according to the preamble of patent claim 1.

Schreibköpfe in Tintenschreibeinrichtungen weisen im wesentlichen eine vielzahl von Tintenkanälen auf, die an der einem Aufzeichnungsträger zugewandten Seite des Schreibkopfes in Austrittsdüsen enden und die mit ihrem anderen Ende in eine gemeinsame Tintenkammer münden. Diese steht über ein Versorgungssystem mit einem Tintenreservoir in Verbindung. Jedem Tintenkanal ist ein Antriebselement zugeordnet, bei dessen individueller Ansteuerung ein einzelnes Tintentröpfchen ausgestoßen wird. Als Antriebselemente finden Thermowandler oder piezokeramische Wandler Anwendung. Die Zufuhr von Tinte in die Tintenkammer und in die einzelnen Tintenkanäle erfolgt in der Regel kapillarisch oder unter Ausnützung eines geringen Unterdrucks im Inneren des Kopfes.Print heads in ink writing devices essentially have a multiplicity of ink channels which end on the side of the write head facing a recording medium in outlet nozzles and which end at the other end in a common ink chamber. This is connected to an ink reservoir via a supply system. A drive element is assigned to each ink channel, and when actuated individually, a single droplet of ink is ejected. Thermal transducers or piezoceramic transducers are used as drive elements. The supply of ink into the ink chamber and into the individual ink channels is usually carried out capillary or using a slight negative pressure inside the head.

Ein geeignetes Verfahren zur Herstellung derartiger Schreibköpfe stellt das sog. anisotropische Ätzverfahren dar (EP 0 359 417 A2). Dabei werden die von einzelnen Kristallrichtungen eines Substratkörpers, z.B. Silizium, abhängigen unterschiedlichen Ätzgeschwindigkeiten ausgenützt, um besonders exakte Konturen verschiedener Tiefe auszubilden.The so-called anisotropic etching process is a suitable method for producing such write heads (EP 0 359 417 A2). The individual crystal directions of a substrate body, e.g. Silicon, depending on different etching speeds used to form particularly precise contours of different depths.

Mit zunehmender Miniaturisierung der tintenführenden Teile eines Schreibkopfes und mit zunehmender Reduzierung der Durchmesser der Austrittsöffnungen wächst die Gefahr, daß bereits kleinste Verunreinigungen der Tinte zu störenden Verstopfungen führen. Es ist deshalb unumgänglich, im Tintenversorgungssystem ein Tintenfilter vorzusehen. Es ist üblich, ein derartiges Filter z.B. in Form eines feinmaschigen Siebes zwischen dem Tintenreservoir und der Tintenkammer anzubringen (Siehe z.B. US-A-4 864 329). Das Anbringen eines solchen Filters, z.B. durch Aufkleben oder andere Befestigungen, wie Andrücken, ist äußerst aufwendig und erfordert zusätzliche Fertigungsschritte.With increasing miniaturization of the ink-carrying parts of a print head and with increasing reduction in the diameter of the outlet openings, the risk increases that even the smallest contamination of the ink leads to disturbing blockages. It is therefore essential to provide an ink filter in the ink supply system. It is common to use a filter of this type, for example in the form of a fine-mesh screen between the ink reservoir and the ink chamber (see, for example, US-A-4 864 329). Attaching such a filter, for example by gluing or other fastenings, such as pressing, is extremely complex and requires additional manufacturing steps.

Der Erfindung liegt die Aufgabe zugrunde, eine Filterung der Tinte zu gewährleisten, ohne daß ein eigenes, d.h. selbständiges Filterelement vorgesehen und eingebaut werden muß.The invention has for its object to ensure filtering of the ink without a separate, i.e. independent filter element must be provided and installed.

Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst.This object is achieved according to the characterizing features of claim 1.

Ausgestaltungen und weitere Verbesserungen sind in den Unteransprüchen gekennzeichnet.Refinements and further improvements are characterized in the subclaims.

Die Vorteile der erfindungsgemäßen Anordnung bestehen im wesentlichen darin, daß der als Kanalstruktur ausgebildete Tintenzufuhrbereich zugleich auch das Filter für die Tinte bildet, also ein integrierter Bestandteil des Schreibkopfes ist und daß die Herstellung zugleich mit der Ausbildung der Tintenkanäle und der Tintenkammer des Schreibkopfes in einem einzigen Arbeitsgang erfolgen kann.The advantages of the arrangement according to the invention consist essentially in the fact that the ink supply area designed as a channel structure also forms the filter for the ink, that is to say it is an integral part of the writing head, and that the production takes place simultaneously with the formation of the ink channels and the ink chamber of the writing head in one Operation can take place.

Die Erfindung wird im folgenden anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles erläutert. Dort zeigenThe invention is explained below with reference to an embodiment shown in the drawings. Show there

Figur 1 die Schnittdarstellung eines Tintenschreibkopfes mit einem Tintenzufuhrbereich gemäß der Erfindung, Figur 2, Figur 3 und Figur 4 jeweils Details der Kanalstruktur nach Figur 1.1 shows the sectional view of an ink writing head with an ink supply area according to the invention, FIG. 2, FIG. 3 and FIG. 4 each show details of the channel structure according to FIG. 1.

Im Ausführungsbeispiel nach Figur 1 sind in einem Substratkörper 1, der beispielsweise aus Silizium besteht, die Tintenkanäle 2 und die Tintenkammer 3 ausgebildet, wobei, wie eingangs beschrieben, das anisotrope Ätzverfahren Anwendung findet. Der Tintenzufuhrbereich weist die erfindungsgemäße Kanalstruktur auf, die aus den in zwei Ebenen 6 und 7 verlaufenden Einzelkanälen 4 und 5 besteht. An die in der oberen Ebene 6 verlaufenden Einzelkanäle 4 ist eine hier nicht dargestellte Tintenversorgungsleitung angeschlossen, über die Tinte von einem ebenfalls nicht dargestellten Tintenreservoir zugeführt wird. Dieses Tintenreservoir kann mit dem Kopf eine kompakte Einheit bilden, in diesen also integriert sein; es kann aber auch als ein Einzelteil, z.B. als ein mit dem Kopf bewegter, austauschbarer Tintenbehälter ausgebildet sein. Die in der unteren Ebene 7 verlaufenden Einzelkanäle 5 münden in die Tintenkammer 3. Das wird dadurch erreicht, daß die Richtung der in den beiden Ebenen 6 und7 verlaufenden Einzelkanälen 4 und 5 um einen Winkel verdreht ist. Im Beispiel beträgt dieser Winkel 90°. Der Flüssigkeitstransport zwischen den Einzelkanälen 4 und 5 ist dadurch sichergestellt, daß jeweils in den Bereichen, in denen sich die Einzelkanäle der unteren und der oberen Ebene kreuzen, Durchbrüche entstehen. In üblicher Weise wird die gesamte Anordnung von einer, z.B. aus Glas bestehenden Abdeckung 8 flüssigkeitsdicht verschlossen.In the exemplary embodiment according to FIG. 1, in a substrate body 1, which consists for example of silicon, the Ink channels 2 and the ink chamber 3 formed, wherein, as described in the introduction, the anisotropic etching process is used. The ink supply area has the channel structure according to the invention, which consists of the individual channels 4 and 5 running in two planes 6 and 7. An ink supply line, not shown here, is connected to the individual channels 4 running in the upper level 6, via which ink is supplied from an ink reservoir, also not shown. This ink reservoir can form a compact unit with the head, so it can be integrated into it; however, it can also be designed as an individual part, for example as an exchangeable ink container which is moved with the head. The individual channels 5 running in the lower level 7 open into the ink chamber 3. This is achieved in that the direction of the individual channels 4 and 5 running in the two levels 6 and 7 is rotated by an angle. In the example, this angle is 90 °. The liquid transport between the individual channels 4 and 5 is ensured by the fact that breakthroughs occur in the areas in which the individual channels of the lower and upper levels intersect. In the usual way, the entire arrangement is closed in a liquid-tight manner by a cover 8, for example made of glass.

Zur näheren Erläuterung der Kanalstruktur wird auf die Figuren 2, 3 und 4 verwiesen. Figur 2 zeigt den Verlauf der Einzelkanäle 4 in der oberen Ebene 6, Figur 3 zeigt den Verlauf der Einzelkanäle 5 in der unteren Ebene 7 und Figur 4 zeigt die Kanalstruktur mit den in den Schnittbereichen der Einzelkanäle 4 und 5 entstehenden Durchbrüchen 9. Die Ausbildung der Einzelkanäle 4 und 5 erfolgt mit Hilfe eines beidseitig auf den Substratkörper 1 aufgebrachten Strichmusters oder Strichgitters, das dem in den Figuren 2 und 3 gezeigten Strichmuster entspricht. Es ist in vorteilhafter Weise möglich, die Masken für den anisotropen Ätzvorgang, mit dem die Tintenkanäle und die Tintenkammer ausgebildet werden, mit einem solchen Strichgitter zu versehen. Dabei ist das Strichgitter auf der einen Seite des Substratkörpers 1 gegenüber dem auf dessen anderer Seite aufgebrachten Strichgitters um einen Winkel, im Beispiel um den Winkel 90° verdreht. Die Kanalstruktur ergibt sich dann in einem beidseitigen Ätzvorgang.For a more detailed explanation of the channel structure, reference is made to FIGS. 2, 3 and 4. FIG. 2 shows the course of the individual channels 4 in the upper level 6, FIG. 3 shows the course of the individual channels 5 in the lower level 7 and FIG Individual channels 4 and 5 are carried out with the aid of a line pattern or line grid applied to the substrate body 1 on both sides, which corresponds to the line pattern shown in FIGS. 2 and 3. It is advantageously possible to use the masks for the anisotropic To provide the etching process with which the ink channels and the ink chamber are formed with such a grating. The grating on one side of the substrate body 1 is rotated by an angle, in the example by an angle of 90 °, with respect to the grating applied on the other side thereof. The channel structure then results in a double-sided etching process.

Die erfindungsgemäße Kanalstruktur gewährleistet nicht nur eine sichere Tintenverbindung; vielmehr steht damit auch ein wirksames Tintenfilter zur Verfügung, das neben einer verbesserten mechanischen Stabilität auch ein gutes Strömungsverhalten für die Tinte aufweist und das in einem einzigen Arbeitsgang zusammen mit den Tintenkanälen und der Tintenkammer herstellbar ist. Vor allem für sog. austauschbare Schreibköpfe bietet die erfindungsgemäße Anordnung Vorteile, da das in den Kopf integrierte Filter besondere Maßnahmen bei Anschluß an das Tintenversorgungssystem einer Schreibeinrichtung nicht mehr erforderlich macht.The channel structure according to the invention not only ensures a secure ink connection; Rather, an effective ink filter is also available which, in addition to improved mechanical stability, also has good flow behavior for the ink and which can be produced in a single operation together with the ink channels and the ink chamber. The arrangement according to the invention offers advantages, above all for so-called interchangeable writing heads, since the filter integrated in the head no longer requires special measures when connected to the ink supply system of a writing device.

Claims (2)

  1. Arrangement for ink supply in a writing head comprising a plurality of ink channels (2) terminating in exit ports, an ink compartment (3) common to the ink channels (2) and an ink supply area via which the ink is fed from an ink reservoir to the ink compartment (3), the ink channels (2) and ink compartment (3) being formed on a substrate (1) by anisotropic etching, characterized in that the ink supply area is formed in the substrate (1) by a channel structure (4, 5) arranged in two planes (6, 7), in that each channel structure (4, 5) comprises a plurality of individual channels and said individual channels (e.g. 4) of a plane (e.g. 6) are offset by an angle relative to the individual channels (e.g. 5) of the other plane (e.g. 7), and in that at the points of intersection of the individual channels (4, 5) openings (9) are provided forming an ink filter and via which ink is supplied to the ink compartment (3), too.
  2. Arrangement according to claim 1, characterized in that the individual channels (4, 5) of the channel structure are formed on the substrate (1) by bilateral anisotropic etching simultaneously with the formation of the ink channels (2) and the ink compartment (3).
EP19900114171 1990-07-24 1990-07-24 Apparatus for feeding ink in an ink writing head Expired - Lifetime EP0468068B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19900114171 EP0468068B1 (en) 1990-07-24 1990-07-24 Apparatus for feeding ink in an ink writing head
DE59009749T DE59009749D1 (en) 1990-07-24 1990-07-24 Arrangement for the ink supply in an ink writing head.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19900114171 EP0468068B1 (en) 1990-07-24 1990-07-24 Apparatus for feeding ink in an ink writing head

Publications (2)

Publication Number Publication Date
EP0468068A1 EP0468068A1 (en) 1992-01-29
EP0468068B1 true EP0468068B1 (en) 1995-10-04

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EP19900114171 Expired - Lifetime EP0468068B1 (en) 1990-07-24 1990-07-24 Apparatus for feeding ink in an ink writing head

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05177831A (en) * 1991-12-27 1993-07-20 Rohm Co Ltd Ink jet printing head and electronic device equipped therewith
US6039437A (en) * 1995-01-31 2000-03-21 Canon Kabushiki Kaisha Ink-jet head and ink-jet printing apparatus incorporating the same
NL1008754C2 (en) * 1998-03-30 1999-10-01 Stork Digital Imaging Bv Ink metering device, as well as ink jet printhead provided with such an ink metering device.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639748A (en) * 1985-09-30 1987-01-27 Xerox Corporation Ink jet printhead with integral ink filter
US4863560A (en) * 1988-08-22 1989-09-05 Xerox Corp Fabrication of silicon structures by single side, multiple step etching process
US4864329A (en) * 1988-09-22 1989-09-05 Xerox Corporation Fluid handling device with filter and fabrication process therefor

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Publication number Publication date
EP0468068A1 (en) 1992-01-29
DE59009749D1 (en) 1995-11-09

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