EP4126551A1 - Tintenstrahldruckkopf - Google Patents
TintenstrahldruckkopfInfo
- Publication number
- EP4126551A1 EP4126551A1 EP21712780.2A EP21712780A EP4126551A1 EP 4126551 A1 EP4126551 A1 EP 4126551A1 EP 21712780 A EP21712780 A EP 21712780A EP 4126551 A1 EP4126551 A1 EP 4126551A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrically conductive
- electrical conductor
- outlet channel
- print head
- conductive liquid
- 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.)
- Granted
Links
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
- B41J2/015—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
-
- 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
- B41J2002/041—Electromagnetic transducer
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/04—Heads using conductive ink
Definitions
- the invention relates to an ink jet print head for printing on a substrate.
- the invention also relates to a printing device and a method for printing on a substrate.
- digital printing For printing sheets of paper with ink, digital printing using ink jet print heads is widespread.
- the inkjet printhead has also established itself in the printing of other media, such as, for example, the printing of housing parts made of plastic.
- digital printing is usually understood to mean printing processes in which the print image is transferred directly from a file or a data stream from a computer to a printing machine without using a static printing form. With its dynamic print image generation, digital printing opens up the possibility of inexpensive individual printing of substrates.
- liquid droplets In digital printing with an inkjet printhead, small drops of liquid, such as drops of ink, are ejected from the inkjet printhead. After leaving the inkjet printhead, the liquid droplets typically cover a distance of a few millimeters and then hit the substrate to be printed. As soon as an uneven surface, for example the uneven surface of a plastic housing, is to be printed, the inkjet printhead cannot be brought as close as desired to the surface of the substrate to be printed due to the geometry of the substrate to be printed. When printing over a larger distance that is necessary as a result, the quality of the print image is reduced, for example due to the resulting blurring. This is due, among other things, to the movement of the liquid droplets through the air, since the liquid droplets are slowed down and deflected when they collide with air molecules.
- the kinetic energy of the dispensed liquid drop can be increased, for example. Since the mass of the liquid drop cannot be increased at will without impairing the quality, an increase in the speed of the drop is advisable. On the other hand, the exit speed of the liquid droplets cannot be increased as desired, for example by means of a piezomechanical actuator. It is therefore advisable to further accelerate the liquid drop after it has been ejected from the ink jet nozzle.
- EP 3 069 884 A1 describes a print head with comb electrodes which are connected to a voltage source and generate an electrical field via which a drop of liquid can be accelerated.
- an inkjet printhead for printing on a substrate comprising: at least one nozzle adapted to dispense at least one electrically conductive liquid drop; and an outlet channel, arranged on the nozzle, wherein the electrically conductive liquid drop can be dispensed through the outlet channel in the direction of the substrate to be printed; wherein an acceleration means is provided on the outlet channel which is adapted to generate a current flow through the electrically conductive liquid drop and a magnetic field in order to accelerate the electrically conductive liquid drop by means of a force in the outlet channel in the direction of the substrate to be printed.
- the nozzle can be connected to a fluid reservoir and drops of the electrically conductive fluid can be released in a targeted manner by pressure surges from a piezomechanical actuator. In a rest position, the nozzle can be sealed off by a negative pressure applied above the nozzle, so that the electrically conductive liquid is prevented from flowing out.
- the electrically conductive liquid drop can be a drop of a printable medium, for example an ink drop of an electrically conductive ink.
- the outlet channel can be designed as a hollow cylinder or tubular and arranged between the nozzle and the substrate to be printed, so that the electrically conductive liquid drop passes through the outlet channel before it is released onto the substrate to be printed.
- a central axis of the outlet channel can also be a central axis of the nozzle. The central axis can extend, for example, at right angles to the substrate to be printed.
- the outlet channel comprises an acceleration means which is adapted to generate a current flow through the electrically conductive liquid droplet. Furthermore, the acceleration means is adapted to generate a magnetic field in order to accelerate the electrically conductive liquid drop by means of a force in the outlet channel in the direction of the substrate to be printed.
- the term “to accelerate in the outlet channel” can be used to describe an acceleration of the electrically conductive liquid drop along the outlet channel.
- the accelerating means can comprise two electrodes which can be arranged in the outlet channel or can be designed as parts of the outlet channel.
- the electrodes can be designed as electrical conductors, for example.
- the electrically conductive liquid drop runs through the outlet channel, a circuit between the electrodes can be closed by the electrically conductive liquid drop.
- the distance between the two electrodes can be adapted to a size of the electrically conductive liquid drop so that the electrically conductive liquid drop can touch both electrodes in order to close the circuit.
- the electrically conductive liquid drop can then be accelerated by the resulting Lorentz force which the electrically conductive liquid drop experiences as a result of the magnetic field acting on it.
- the Lorentz force acts in the direction of movement of the electrically conductive liquid drop and perpendicular to a current flow direction and to the direction of the magnetic field lines.
- the electrically conductive liquid drop can have a very low resistance in order to prevent increased heat development with the risk of the electrically conductive liquid evaporating.
- a low resistance of the electrically conductive liquid drop is also advantageous in order to achieve correspondingly high currents at low voltages so that a current flashover or short circuit between the electrodes can be avoided.
- the electrically conductive liquid drop can have an electrical conductivity of more than 0.1 S / m (Siemens per meter), in particular of more than 1 S / m or more than 10 S / m.
- the current flow through the electrically conductive liquid droplet advantageously causes the electrically conductive liquid droplet to move along the outlet channel due to the resulting Lorentz force always accelerated.
- the electrically conductive liquid drop reaches a higher speed at the end of the acceleration path, a higher kinetic energy and thus a more stable trajectory with which larger distances between the print head and the substrate to be printed can be bridged without the quality of the print image being negatively affected.
- the accelerating means comprises at least a first electrical conductor and a second electrical conductor, wherein the first electrical conductor and the second electrical conductor are arranged to be electrically insulating from one another, and wherein the first electrical conductor and the second electrical conductor are matched to the electrically conductive one To be in contact with drops of liquid in the outlet channel.
- the first electrical conductor and the second electrical conductor are adapted to be in contact with the electrically conductive liquid drop in the outlet channel in order to generate the magnetic field. In this case, the magnetic field can be generated by the current flow through the electrically conductive liquid drop.
- the term “being in contact” can be understood to mean that the electrically conductive liquid drop touches the first and the second electrical conductor at the same time in order to be able to close an electrical circuit.
- the first and the second electrical conductor can be formed from an electrically conductive material, such as, for example, from a copper material, and can be arranged in the form of a strip along an inner side of the outlet channel.
- the first electrical conductor and the second electrical conductor can be arranged essentially opposite one another on the inside of the outlet channel over the entire course direction or only in a partial area of the course direction.
- a long acceleration distance can advantageously be achieved by arranging the first and the second electrical conductor over the entire course direction.
- the first electrical conductor and the second electrical conductor run along a longitudinal extension of the outlet channel.
- the magnetic component and thus also the acceleration are advantageous when the direction of movement of the electrically conductive liquid drop runs perpendicular to the magnetic field lines.
- the electrical conductors can also be arranged in a spiral or in some other way in the outlet channel.
- the inkjet print head comprises at least two electrical insulating means, the first electrical conductor and the second electrical conductor being arranged essentially opposite one another and being separated from one another on both sides by means of one of the electrical insulating means for electrically insulating the electrical conductors from one another.
- the first electrical conductor and the second electrical conductor can advantageously each be designed as one half of an outlet channel separated along the longitudinal direction.
- the two halves can each be isolated from one another by means of an electrical insulating means, which can be designed, for example, as a plastic strip or also as an electrically insulating adhesive.
- the outlet channel can then run on an inside of such an arrangement.
- a connection of a power supply in particular a direct current supply, can be connected to a respective connection on each of the two halves configured as electrical conductors.
- a very compact structure is also advantageously achieved by the design described above.
- the inkjet printhead comprises an electrical insulating means, wherein the electrical insulating means is designed as a tubular element, and wherein the outlet channel is formed on an inside of the tubular element.
- the electrical insulating means can be designed as a plastic tube and the outlet channel can run on the inside of the outlet channel.
- the outlet channel can also be designed differently.
- the outlet channel can also be configured to be elliptical or rectangular, depending on the configuration of the electrical insulating means.
- first electrical conductor and the second electrical conductor are arranged as current-conducting paths essentially opposite one another on the inside of the tubular element.
- the first electrical conductor and the second electrical conductor can be glued, vapor-deposited or otherwise arranged as conductor tracks on the inside of the tubular element.
- connection contacts can be arranged on the conductor tracks for connecting the power supply.
- the outlet channel runs in a funnel shape between the nozzle and the substrate to be printed.
- a diameter of the outlet channel can taper in the direction of the substrate to be printed.
- the electrical conductors can be arranged at least in some areas on the tapered diameter.
- the nozzle comprises a piezomechanical actuator, in particular a piezomechanical drop-on-demand actuator.
- a piezo element can be deformed by applying an electrical voltage in such a way that the deformation generates a pressure wave in the liquid reservoir, which causes a liquid drop to be ejected through the nozzle.
- the inkjet printhead can be used for a printing technique known as drop-on-demand.
- a printing technique known as drop-on-demand.
- drops of liquid are ejected when they are actually needed.
- the electrically conductive liquid drop comprises an electrically conductive ink, an electrically conductive adhesive, an electrically conductive lubricant, or an electrically conductive coating agent.
- adhesive, lubricant or coating agent can also advantageously be printed onto the substrate.
- the acceleration means has a means for generating the magnetic field, in particular a permanent magnet or an electric magnet.
- the means for generating the magnetic field can, for example, at least regionally be arranged on the outlet channel in order to generate a magnetic field perpendicular to the direction of flow.
- the means for generating the magnetic field can be used in addition to the first electrical conductor and the second electrical conductor.
- the invention also relates to a printing device for printing on a substrate, comprising an ink jet printhead as described herein.
- the printing device has a power source, in particular a direct current source, for generating a current flow through the electrically conductive liquid drop.
- the printing device can have a control means which, for example, can be comprised by the power source and, in addition to the power source, can be further adapted to control the nozzle and / or the means for generating the magnetic field.
- a control means which, for example, can be comprised by the power source and, in addition to the power source, can be further adapted to control the nozzle and / or the means for generating the magnetic field.
- the invention further relates to a method for printing a substrate, comprising:
- Dispensing at least one electrically conductive liquid droplet through a nozzle of an inkjet printhead Dispensing at least one electrically conductive liquid droplet through a nozzle of an inkjet printhead
- Fig. 1 is a view of an ink jet print head according to a first
- FIG. 2A, 2B show sectional views of two possible configurations of the outlet channel along the section line AA shown in FIG. 1; and Fig. 3 is a view of an ink jet print head according to a second
- FIG. 1 shows a view of an ink jet print head 1 according to a first embodiment.
- the illustrated ink jet print head 1 has a nozzle 3 which is adapted to dispense an electrically conductive liquid drop 7.
- the nozzle 3 shown is connected to a liquid reservoir and has a piezomechanical actuator which can be deformed by applying an electrical voltage in such a way that the deformation generates a pressure wave in the liquid reservoir that causes the electrically conductive liquid drop 7 to be ejected through the Nozzle 3 causes.
- the illustrated inkjet print head 1 can be used for a printing technique known as drop-on-demand.
- the electrically conductive liquid drop 7 shown by way of example in FIG. 1 can, as an alternative to an electrically conductive ink, also comprise an adhesive, a lubricant, a coating agent, or another electrically conductive liquid that is to be applied to a substrate 17.
- the substrate 17 is shown in Figure 1 as a substrate 17 having a planar surface, such as a sheet of paper. In embodiments that are not shown, the substrate can also comprise a surface with a three-dimensional surface.
- FIG. 1 shows an outlet channel 5 which is arranged on the nozzle 3. As shown, the electrically conductive liquid drop 7 is discharged through the outlet channel 5 in the direction of the substrate 17 to be printed.
- the central axis of the outlet channel 5 is also a central axis of the nozzle 3.
- the central axis extends at right angles to the substrate 17 to be printed.
- the acceleration means 9 has a first electrical conductor 11a and a second electrical conductor 11b, which are arranged as electrodes in or on the outlet channel 5.
- FIG. 1 also shows that the first electrical conductor 11a and the second electrical conductor 11b each have a connection contact for connecting a current source 19.
- an electrical conductor with a positive pole is the Power source 19 is connected and the other electrical conductor is connected to a negative pole of the power source 19.
- the first electrical conductor 11a and the second electrical conductor 11b extend in the embodiment shown in Figure 1 over the entire length of the outlet channel 5.
- the electrical conductors can also be designed so that they only extend over a portion of the length of the outlet channel extend.
- FIG. 1 shows that the electrically conductive liquid drop 7 runs through the outlet channel 5 and thereby closes a circuit between the first electrical conductor 11a and the second electrical conductor 11b.
- the distance between the first electrical conductor 11a and the second electrical conductor 11b is selected such that the electrically conductive liquid drop 7 can touch both electrical conductors 11a, 11b in order to complete the circuit.
- the magnetic field B can be generated by the current flow through the electrically conductive liquid drop.
- the electrically conductive liquid drop 7 is accelerated by the resulting Lorentz force FL, which the electrically conductive liquid drop 7 experiences through a magnetic field B.
- the Lorentz force FL acts in the direction of movement of the electrically conductive liquid drop 7.
- a means 13 for generating a magnetic field B is also arranged on or around the outlet channel 5 in FIG. 1 in order to generate the magnetic field B perpendicular to the direction of the current.
- the means 13 for generating the magnetic field B can have a height which corresponds to the height of the electrical conductors 11a, 11b.
- FIGS. 2A and 2B show sectional views of two possible configurations of the outlet channel 5 along the section line A-A shown in FIG.
- FIG. 2A shows a possible structure of the outlet channel 5 and the accelerating means 9, the first electrical conductor 11a and the second electrical conductor 11b being arranged essentially opposite one another and being separated from one another by means of an electrical insulating means 15a, 15b, for electrically isolating the electrical conductors 11a, 11b from one another.
- the first electrical conductor 11a and the second electrical conductor 11b can thereby form part of the outlet channel 5.
- the means 13 for generating a magnetic field B is arranged around the outlet channel 5 in order to generate the magnetic field B perpendicular to the direction of flow, as shown.
- the means 13 for generating a magnetic field B can also not be arranged exactly perpendicular, but at a certain angle to the electrical conductors 11a, 11b.
- FIG. 2B shows an alternative structure of the outlet channel 5 and the acceleration means 9, the electrical insulating means 15 being designed as a tubular element, and the outlet channel 5 running on an inside of the tubular element.
- the first electrical conductor 9a and the second electrical conductor 9b are arranged as current-conducting paths essentially opposite one another on the inside of the electrical insulating means 15 shown as a tubular element.
- the first electrical conductor 11a and the second electrical conductor 11b can be glued, vapor-deposited or otherwise arranged on the inside of the outlet channel 5.
- FIG. 3 shows a view of an ink jet print head T according to a second embodiment.
- the inkjet print head T shown differs from the inkjet print head previously shown in FIG. 1 in that the outlet channel 5 'runs in a funnel shape between the nozzle 3' and the substrate 17 'to be printed.
- a diameter of the outlet channel 5 'tapers in the direction of the substrate 17' to be printed As shown in FIG. 3, a diameter of the outlet channel 5 'tapers in the direction of the substrate 17' to be printed.
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020108317.3A DE102020108317A1 (de) | 2020-03-26 | 2020-03-26 | Tintenstrahldruckkopf |
| PCT/EP2021/056548 WO2021190978A1 (de) | 2020-03-26 | 2021-03-15 | Tintenstrahldruckkopf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4126551A1 true EP4126551A1 (de) | 2023-02-08 |
| EP4126551B1 EP4126551B1 (de) | 2023-08-23 |
Family
ID=74947397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21712780.2A Active EP4126551B1 (de) | 2020-03-26 | 2021-03-15 | Tintenstrahldruckkopf |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4126551B1 (de) |
| JP (1) | JP7389271B2 (de) |
| DE (1) | DE102020108317A1 (de) |
| WO (1) | WO2021190978A1 (de) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4023180A (en) | 1976-01-12 | 1977-05-10 | Zenner Walter J | Dot printer with electrically propelled ink |
| JPH01130952A (ja) * | 1987-11-18 | 1989-05-23 | Matsushita Electric Ind Co Ltd | インク噴射装置 |
| KR930012307A (ko) | 1991-12-23 | 1993-07-20 | 정용문 | 전자펌핑 드롭-온-디멘드 잉크제트 프린트 헤드 |
| JPH05212868A (ja) * | 1992-02-06 | 1993-08-24 | Seiko Instr Inc | 記録装置 |
| JPH05309837A (ja) * | 1992-05-07 | 1993-11-22 | Murata Mach Ltd | インクジェット記録装置 |
| US5560543A (en) * | 1994-09-19 | 1996-10-01 | Board Of Regents, The University Of Texas System | Heat-resistant broad-bandwidth liquid droplet generators |
| KR0147902B1 (ko) * | 1995-04-24 | 1998-08-17 | 김광호 | 액체금속을 이용한 잉크분사식 프린터 헤드의 제어장치 및 방법 |
| JPH1034934A (ja) * | 1996-07-25 | 1998-02-10 | Fuji Xerox Co Ltd | インクジェット記録装置 |
| JPH1134336A (ja) * | 1997-07-18 | 1999-02-09 | Mitsubishi Heavy Ind Ltd | インク送出方法およびインクジェットプリンタ |
| JPH11227219A (ja) * | 1998-02-19 | 1999-08-24 | Casio Comput Co Ltd | インクジェットプリンタ |
| KR100762036B1 (ko) * | 2006-02-24 | 2007-09-28 | 비오이 하이디스 테크놀로지 주식회사 | 잉크젯 프린터 |
| JP2009000897A (ja) | 2007-06-21 | 2009-01-08 | Rohm Co Ltd | 印字方法 |
| WO2013050250A1 (en) | 2011-10-06 | 2013-04-11 | Oce-Technologies B.V. | Method and system for maintaining jetting stability in a jetting device |
| PL226753B1 (pl) | 2015-03-17 | 2017-09-29 | Piotr Jeuté | Głowica drukujaca |
| EP3124249A1 (de) | 2015-07-28 | 2017-02-01 | OCE-Technologies B.V. | Strahlvorrichtung |
-
2020
- 2020-03-26 DE DE102020108317.3A patent/DE102020108317A1/de not_active Ceased
-
2021
- 2021-03-15 JP JP2022557944A patent/JP7389271B2/ja active Active
- 2021-03-15 WO PCT/EP2021/056548 patent/WO2021190978A1/de not_active Ceased
- 2021-03-15 EP EP21712780.2A patent/EP4126551B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020108317A1 (de) | 2021-09-30 |
| JP7389271B2 (ja) | 2023-11-29 |
| WO2021190978A1 (de) | 2021-09-30 |
| JP2023518587A (ja) | 2023-05-02 |
| EP4126551B1 (de) | 2023-08-23 |
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