EP0118603A1 - Tintenstrahlbildende Einheit - Google Patents
Tintenstrahlbildende Einheit Download PDFInfo
- Publication number
- EP0118603A1 EP0118603A1 EP83111510A EP83111510A EP0118603A1 EP 0118603 A1 EP0118603 A1 EP 0118603A1 EP 83111510 A EP83111510 A EP 83111510A EP 83111510 A EP83111510 A EP 83111510A EP 0118603 A1 EP0118603 A1 EP 0118603A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- ink jet
- forming unit
- jet forming
- 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.)
- Granted
Links
Images
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
- B41J2/14088—Structure of heating means
- B41J2/14096—Current flowing through the ink
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics
Definitions
- This invention relates to ink jet forming units in an ink jet printer.
- An ink jet printer is advantageous in that it can record data on ordinary sheets, it needs no developing nor fixing, and it generates little noise.
- Recording systems employed for the printer are roughly classified into (1) a first or continuous type in which ink drops are continuously jetted and are selectively applied to a recording sheet, and (2) a second or pulsed group in which an ink drop is jetted only when printing is effected.
- the recording systems in the pulsed group can be further classified according to principle of operation of forming the ink jet with an ink jet forming unit.
- an ink jet forming unit for a so-called -magneto-fluid-graphic n system a magnetic ink is allowed to rise on a controlling recording stylus'and it is then attracted by an electric field so that it is jetted. Therefore, in the case where data are recorded in color with the ink jet forming unit, the number of recording colors is limited because the magnetic material has its own color other than the color of the ink and the color of the ink may change as the magnetic material is oxidized.
- an .object of this invention is to provide an ink jet forming unit which can record data in desired colors and stably jets ink drops.
- an ink jet forming unit which, according to the invention, comprises: gas producing means for electrolyzing water of a water-based ink to produce a gas; and a nozzle in which an ink drop is formed by the gas and is jetted by the pressure which is provided as the gas expands.
- Fig. 1 is an external view showing a print head using ink jet forming units according to this invention
- Fig. 2 is a perspective view showing the essential components of the ink jet forming unit in one of the nozzles of Fig. 1;
- Fig. 3 is an explanatory diagram describing the principle of operation for forming an ink jet with the ink jet forming unit of Figs. 1 and 2;
- Fig. 4 is a perspective view showing the essential component of one modification of the ink jet forming unit of the invention.
- Fig. 5 is an explanatory diagram describing the principle of operation for forming an ink jet with the ink jet forming unit of Fig. 4.
- Fig. 1 shows the external appearance of a print head.
- the print head 10 has an apperture plate whose length is substantially equal to the width of a recording sheet (not shown).
- a number of ink jet forming units are arranged on the apperturs plate (the nozzle plate). More specifically, the ink jet forming units are arranged at ) equal intervals and in a line in the longitudinal direction of the ink jetting surface 1.
- a nozzle 12 is associated with each ink jet forming unit and has an opening, each side of which is about 60 ⁇ m. In this case, 1,728 nozzles 12 are arranged at equal intervals of 60 ⁇ m.
- Fig. 2 shows the essential parts of the ink jet forming unit.
- the nozzle 12 is an elongated, insulated and hollow part.
- the nozzle 12 has upper and lower electrodes 14 and 15 at positions on the inner walls which are slightly backward of the external opening and are positioned such that the electrodes 14 and 15 confront each other.
- a series circuit consisting of a switch 16 and a DC voltage source is connected between the upper and lower electrodes 14 and 15.
- the switch 16 is turned on, the water-based ink (not shown).in the nozzle 12 is subjected to electrolysis, so that the ink comes out -in a jet.
- the upper and lower electrodes 14 and 15 are of.a metal such as nickel, silver, nickel-plated iron, or gold-or .silver-plated iron.
- the electrodes are formed in the nozzle by vacuum deposition or other conventional methods.
- Fig. 3 shows the principle of forming an ink jet with the ink jet forming unit.
- Fig. 3(A) shows the standby state of the ink jet forming unit in which the nozzle 12 is filled with ink 18.
- the ink is supplied from an ink tank (not 'shown) by capillary action.
- the ink 18 is prepared by dissolving pigment and electrically conductive material in water.
- the conductivity of the ink is adjusted to be between 1 0 -1 and 10 -2 ⁇ -1 . cm -1 .
- Fig. 3(B) shows the initial state of the ink jet forming unit, in which a recording voltage is applied between the electrodes 14 and 15.
- a printing pulse of several volts to several tens of volts is applied between the electrodes 14 and 15
- hydrogen is produced from the upper electrodes 14 which is used as a cathode
- oxygen is produced from the lower electrode 15 which is used as an anode.
- These'gases form bubbles 21 and 22.
- the bubbles 21 and 22 grow abruptly into one bubble as shown in Fig. 3(C).
- the ink column is separated into two parts near the opening; that is, an ink part l8A is formed and separated from the remaining ink 18 by the bubbles 21, 22.
- the ink 18A is moved outwardly as bubbles 21 and 22 grow and coalesce, and is.finally jetted as an ink droplet 23 as shown in Fig. 3(D).
- the above-described operation is accomplished in one microsecond to several.hundreds of micro-seconds in which the printing pulse is applied.
- the ink droplet 23 strikes a recording sheet which is spaced slightly away from the ink jet forming unit, thus printing one dot.
- a number of ink jet forming units of the print head 10 are selectively driven according to a picture signal, to record data for one line in a single action.
- the recording sheet or the print head is moved a distance of one line in the secondary scanning direction, so that the next printing operation can be started.
- the ink 18 in the nozzle 12 is restored by capillary action as shown in Fig. 3(A).
- ink jet forming units printing can be achieved at a frequency of about 1 kHz if the printing pulse voltage and the size of the ink droplet are set to suitable values. This recording speed is sufficiently high for desired operation. It is unnecessary for the ink to contain magnetic material, and the ink can be used at room temperature. As a result, the ink can be used for a long period of time without any changes in the ink.
- Fig. 4 shows one modification of the nozzle of the ink jet forming unit according to the invention.
- the nozzle 25 is made up of the lower electrode 16 and insulated inner walls.
- a metal plate, or a metal bar, which is made of nickel or the like is arranged in the ink passageway which is linked to the ink tank.
- the metal plate in the passageway is the ether electrode.
- Fig. 5 arranged similarly to Fig. 3, shows the principle of operation for forming an ink jet with the ink jet forming unit in Fig. 4.
- those components which have been described with reference to Fig. 3 are therefore designated by the same reference numerals, and their detailed descriptions are omitted.
- the lower electrode 15 is remote from the other electrode, and only the bubble 22 produced from the lower electrode 15 is directly utilized for jetting an ink drop. Accordingly, in order to obtain the same recording speed as that of the above-described embodiment under the same conditions as those of that embodiment, it is necessary to slightly increase the printing pulse voltage.
- the modification is advantageous in that since only the lower electrode 15 is arranged on the inner wall of the nozzle, the ink jet forming unit can be readily manufactured and accordingly the manufacturing cost can be reduced.
- the ink jet forming units are arranged over the entire width of a recording sheet, so that one line of data is recorded in one action.
- a method may be employed in which one to several tens of ink jet forming units are arranged in a print head, and recording is carried out simultaneously with the parallel ink jet forming units while the print head is moving relative to the recording paper in the main scanning direction. It goes without saying that it is not always required that the nozzle is square or rectangular in section.
- the bubbles are formed by electrolysis. Therefore, it is unnecessary to preheat the ink jet forming units, and it is possible to quickly start the recording operation.
- the ink jet forming unit of the invention is simple in construction, low in manufacturing cost and high in reliability when compared with the conventional one in which an ink drop is jetted by a pressure wave which is provided by an electro-mechanical conversion element.
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3834983A JPS59165662A (ja) | 1983-03-10 | 1983-03-10 | インクジエツト噴射装置 |
JP38349/83 | 1983-03-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0118603A1 true EP0118603A1 (de) | 1984-09-19 |
EP0118603B1 EP0118603B1 (de) | 1988-01-20 |
Family
ID=12522800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83111510A Expired EP0118603B1 (de) | 1983-03-10 | 1983-11-17 | Tintenstrahlbildende Einheit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0118603B1 (de) |
JP (1) | JPS59165662A (de) |
DE (1) | DE3375378D1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0354816A2 (de) * | 1988-08-12 | 1990-02-14 | Esselte Meto International GmbH | Strichkodedruck |
EP0418659A2 (de) * | 1989-09-18 | 1991-03-27 | Matsushita Electric Industrial Co., Ltd. | Tintenstrahlaufzeichnungsgerät |
EP0450548A2 (de) * | 1990-03-31 | 1991-10-09 | Canon Kabushiki Kaisha | Aufzeichnungsvorrichtung durch Flüssigkeitsausstoss |
EP0718103A1 (de) * | 1994-12-20 | 1996-06-26 | Canon Kabushiki Kaisha | Tintenstrahlaufzeichnungsverfahren und -gerät |
EP0820868A2 (de) * | 1996-07-24 | 1998-01-28 | Samsung Electronics Co., Ltd. | Vorrichtung und Verfahren zum Tintenausstoss in einem Tintenstrahldrucker |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2943164A1 (de) * | 1978-10-26 | 1980-05-08 | Canon Kk | Tintenstrahl-aufzeichnungsvorrichtung |
EP0014918A1 (de) * | 1979-02-16 | 1980-09-03 | SMH-ALCATEL Société anonyme dite: | Vorrichtung zum Übertragen von Tintentröpfchen auf einen Aufzeichnungsträger |
DE3228887A1 (de) * | 1981-08-14 | 1983-02-24 | Hewlett-Packard Co., 94304 Palo Alto, Calif. | Verfahren zum austreiben eines fluessigkeitstroepfchens aus einer oeffnung eines kapillarkoerpers |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4275290A (en) * | 1978-05-08 | 1981-06-23 | Northern Telecom Limited | Thermally activated liquid ink printing |
-
1983
- 1983-03-10 JP JP3834983A patent/JPS59165662A/ja active Pending
- 1983-11-17 DE DE8383111510T patent/DE3375378D1/de not_active Expired
- 1983-11-17 EP EP83111510A patent/EP0118603B1/de not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2943164A1 (de) * | 1978-10-26 | 1980-05-08 | Canon Kk | Tintenstrahl-aufzeichnungsvorrichtung |
EP0014918A1 (de) * | 1979-02-16 | 1980-09-03 | SMH-ALCATEL Société anonyme dite: | Vorrichtung zum Übertragen von Tintentröpfchen auf einen Aufzeichnungsträger |
DE3228887A1 (de) * | 1981-08-14 | 1983-02-24 | Hewlett-Packard Co., 94304 Palo Alto, Calif. | Verfahren zum austreiben eines fluessigkeitstroepfchens aus einer oeffnung eines kapillarkoerpers |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0354816A2 (de) * | 1988-08-12 | 1990-02-14 | Esselte Meto International GmbH | Strichkodedruck |
EP0354816A3 (de) * | 1988-08-12 | 1991-11-27 | Esselte Meto International GmbH | Strichkodedruck |
EP0418659A2 (de) * | 1989-09-18 | 1991-03-27 | Matsushita Electric Industrial Co., Ltd. | Tintenstrahlaufzeichnungsgerät |
EP0418659B1 (de) * | 1989-09-18 | 1997-01-08 | Matsushita Electric Industrial Co., Ltd. | Tintenstrahlaufzeichnungsgerät |
EP0450548A2 (de) * | 1990-03-31 | 1991-10-09 | Canon Kabushiki Kaisha | Aufzeichnungsvorrichtung durch Flüssigkeitsausstoss |
EP0450548A3 (en) * | 1990-03-31 | 1992-01-22 | Canon Kabushiki Kaisha | Apparatus for recording by discharging a liquid |
EP0718103A1 (de) * | 1994-12-20 | 1996-06-26 | Canon Kabushiki Kaisha | Tintenstrahlaufzeichnungsverfahren und -gerät |
US6065827A (en) * | 1994-12-20 | 2000-05-23 | Canon Kabushiki Kaisha | Ink jet recording method and ink jet recording apparatus |
EP0820868A2 (de) * | 1996-07-24 | 1998-01-28 | Samsung Electronics Co., Ltd. | Vorrichtung und Verfahren zum Tintenausstoss in einem Tintenstrahldrucker |
EP0820868A3 (de) * | 1996-07-24 | 1998-10-28 | Samsung Electronics Co., Ltd. | Vorrichtung und Verfahren zum Tintenausstoss in einem Tintenstrahldrucker |
Also Published As
Publication number | Publication date |
---|---|
DE3375378D1 (en) | 1988-02-25 |
EP0118603B1 (de) | 1988-01-20 |
JPS59165662A (ja) | 1984-09-18 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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