EP0378387B1 - Méthode d'enregistrement par jet d'encre - Google Patents

Méthode d'enregistrement par jet d'encre Download PDF

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Publication number
EP0378387B1
EP0378387B1 EP19900300277 EP90300277A EP0378387B1 EP 0378387 B1 EP0378387 B1 EP 0378387B1 EP 19900300277 EP19900300277 EP 19900300277 EP 90300277 A EP90300277 A EP 90300277A EP 0378387 B1 EP0378387 B1 EP 0378387B1
Authority
EP
European Patent Office
Prior art keywords
recording
ink
ink jet
jet recording
recording unit
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
EP19900300277
Other languages
German (de)
English (en)
Other versions
EP0378387A3 (fr
EP0378387A2 (fr
Inventor
Shinichi Hirasawa
Hiroyuki Tsunashima Higashi Manshion 202 Maeda
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.)
Canon Inc
Original Assignee
Canon Inc
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 JP1002942A external-priority patent/JP2795661B2/ja
Priority claimed from JP1002941A external-priority patent/JP2735852B2/ja
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0378387A2 publication Critical patent/EP0378387A2/fr
Publication of EP0378387A3 publication Critical patent/EP0378387A3/fr
Application granted granted Critical
Publication of EP0378387B1 publication Critical patent/EP0378387B1/fr
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
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2125—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of nozzle diameter selection

Definitions

  • the present invention relates to an ink jet recording method, in particular, but not exclusively, to an on-demand type ink jet recording method, and also apparatus therefor.
  • the recording unit of almost of the ink jet recording methods which have conventionally been used is a dot.
  • One dot denotes an image obtained as a result of that one liquid droplet was deposited on a recording medium such as a recording paper or the like. That is, a discharging density of liquid droplet determines the resolution after recording, namely, the recording unit.
  • a dither method as one of the image expressing methods.
  • a concept of a pixel is used.
  • One pixel comprises a plurality of dots and the gradation is expressed by changing the number of dots. That is, the dots decides the resolution of a recording object, i.e., the recording unit. Therefore, the recording unit in the dither method is determined by the dot density.
  • a coated paper has generally been used as an ink jet recording paper.
  • an ordinary paper there is a large demand to use an ordinary paper in consideration of the running costs, using efficiency, and the like.
  • the paper which is used will certainly be changed from the coated paper to the ordinary paper.
  • Figs. 1A and 1B are diagrams for explaining the fixing time.
  • Fig. 1A shows the case where a liquid droplet having a diameter of d was deposited onto a surface X-X′ of a coated paper and became a dot of a diameter of ⁇ a d.
  • Fig. 1B shows the case where a liquid droplet of the diameter of d was deposited onto the surface X-X′ of the ordinary paper and became a dot of a diameter of ⁇ b d.
  • ⁇ a and ⁇ b denote ratios (hereinafter, referred to as bleeding ratios) of the dot diameter to the liquid droplet diameter.
  • the bleeding ratio of the coated paper is larger than that of the ordinary paper and there is a relation of ⁇ a > ⁇ b .
  • an amount of ink which should be received per unit area of the ordinary paper is larger than that of the coated paper.
  • Figs. 1A and 1B consideration has been made with respect to a model such that the liquid droplets having the same diameter d are transformed to the circular cylinders each having the same bottom area as that of the dot and are fixed onto the papers.
  • heights H a and H b of the circular cylinders are proportional to the inks to be received per unit area of the papers.
  • H a ⁇ H b between the heights H a and H b of the circular cylinders on the coated paper and the ordinary paper as will be understood from Figs. 1A and 1B. Since the fixing time increases as the circular cylinder is high, it takes a longer time to fix the ink onto the ordinary paper and such a long time causes a serious obstacle to realize the high printing speed.
  • the ordinary paper does not have a special ink absorbing layer. Therefore, since the ink must be fixed into the space in which fibers and a sizing material such as a resin or the like are complicatedly mixed, the bleeding of the ink is anisotropic and the dot shape becomes complicated. Further, the ink runs along the fibers as in a capillarity and results in a dot with a mustache-like protrusion. In many cases, a serious adverse influence is exerted on the printing quality. Such a problem will now be considered with respect to a cylindrical model. Since an amount of ink to be received per unit area of the paper increases as the height of the circular cylinder is high, the dot shape also deteriorates. That is, for the ordinary paper, there is a tendency to deteriorate the dot shape from not only the quality of the paper but also the cylindrical model.
  • the ink can be preferably fixed and printed onto an acid paper using the resin or the like as a sizing material, for neutral papers in which a production amount has been increasing more and more in recent years, there is a tendency such that the fixing performance remarkably deteriorates and the printing quality also slightly deteriorates.
  • the ink of the strong base also has a drawback such that since the permeable force of the ink of the strong base into the paper is large, the ink easily reaches the back side and it is extremely difficult to record both sides of the paper.
  • the present invention is intended as an improvement.
  • a method of ink jet recording in which method ink is discharged from an ink jet recording head as droplets to define a single recording unit, the droplets of the recording unit being discharged at an interval which is 1/N of a pitch (P), which pitch (P) is a distance between respective centres of adjacent recording units and N is a natural number of 2 or more, which method is characterised in that: adjacent droplets of at least two recording units which are adjacent are discharged at an interval which is 1/N of said pitch; and said droplets, defining a single recording unit, are each of sufficient volume so that together they completely cover the area of said recording unit.
  • a head which can discharge the liquid droplets at the interval of 1/N of the recording unit for example, a head with a plurality of orifices of small area provided at high density is used, the amount of ink received per unit area of a recording paper can be reduced, thereby improving the fixing performance and the printing quality. Further, if each recording unit is divisionally recorded a number of times, i.e. a plurality of recording operations are performed, the fixing performance and the printing quality of a recording can be further improved.
  • an apparatus for ink jet recording comprising: an ink jet recording head assembly including at least one ink jet recording head for discharging ink droplets for forming a multiplicity of ink dots on a recording medium; and control means co-operable with said assembly for determining ink dot location on said recording medium; in which said at least one ink jet recording head and said control means, are adapted to compose an image in which each recording unit thereof shall comprise a plurality of merged ink dots, the ink dots of each recording unit being recorded on the medium at an interval which is 1/N of a pitch (P), which pitch is a distance between respective centres of adjacent recording units and N is a natural number of 2 or more; which apparatus is characterised in that: adjacent dots of at least two recording units which are adjacent are recorded at an interval which is 1/N of said pitch; and said control means is co-operable with said at least one ink jet recording head so that the volume of each droplet discharged from the or each ink emitting or
  • United States Patent 4617580 concerns an ink jet recording apparatus which is adapted to record at an optimal density on different types of recording medium, e.g. paper and overhead projector (OHP) film.
  • the apparatus described therein has a first mode for printing on e.g. paper, in which one droplet of ink is discharged per recording unit.
  • OHP film In the second mode for printing e.g. on OHP film, a plurality of droplets of ink are discharged per recording unit.
  • the aforesaid ink droplets are all discharged from the same single nozzle. Complete coverage of each recording unit, however, is not disclosed.
  • Patent Abstracts of Japan, Vol.6, No.181 (M-156)[1059], September 17, 1982 and Japanese Kokai JP-A-5789973 have addressed the problem of improving printing quality.
  • Using two ink jet nozzles, one per head, and one droplet per recording unit droplets of diameter less than 1 ⁇ 2 the scan line interval are recorded. This is to ensure that there is a clearly defined boundary between black and white parts of the recording.
  • Fig. 2A shows a printing model of a recording unit which was recorded by a recording method of the invention.
  • Fig. 2B shows a printing model according to a conventional method. The printing was executed by using a multi-orifice type ink jet head.
  • a plan view of one recording unit when the bleeding ratio is set to 1.8 and a cylindrical model of the ink shown in Figs. 1A and 1B are shown.
  • a dot size is set into the minimum size so as to completely paint out the whole region without a gap in what is called a paint-out printing mode.
  • a circle written by a broken line denotes an adjacent recording unit.
  • a head which can discharge liquid droplets at a density which is twice as large as the conventional recording unit with respect to one direction for example, a head with plurality of orifices of small areas provided at high density, and one recording unit comprises four dots.
  • four liquid droplets are certainly discharged in response to one recording signal and such a method fundamentally differs from the gradation expression to control the number of liquid droplets or the like.
  • one recording unit is divisionally printed by a plurality of (two) printing operations.
  • Figs. 3A to 3D show a printing method in the embodiment.
  • dots which are recorded by the first printing operation are shown by solid lines.
  • Fig. 3D shows a state after completion of the second recording operation, that is, a state after the recording unit was completed.
  • the first printing operation is executed as shown in Figs. 3A, 3B, or 3C and the second printing operation is then performed, thereby completing the printing of one recording unit.
  • the present invention is used in a serial type ink jet recording apparatus conducting reciprocal printing as shown in Fig. 5 described in the following description, the first printing operation is executed during forward printing operation while the second printing operation is executed during reverse printing operation.
  • a method of dividing the component dots and printing is not limited to the method in the embodiment.
  • D1 and H1 denote a dot diameter and a height of a cylindrical model according to the conventional printing method.
  • D2 and H2 denote a dot diameter and a height of a cylindrical model in the present invention.
  • each dot is constructed by a circle and the result which is obtained by dividing a volume of liquid droplets by the area which is occupied by a set of the dots is set to a height of a cylindrical model.
  • H2 is set to the value which is obtained by dividing the volume of four liquid droplets by the area of the recording unit in Fig. 2A.
  • the invention intends to improve the fixing performance and the printing quality by setting the value of H1 to be smaller than that of H2.
  • one recording unit is constructed by a plurality of, particularly, two printing operations. Therefore, a height H21 of cylinder per recording operation is further reduced.
  • the height of cylindrical model further decreases, the fixing time is reduced, and the dot shape is also further improved.
  • FIGS. 4A and 4B schematically show optical microscopic photographs of a printed example (a) according to the conventional example and a printed example (b) according to the embodiment. It will be understood from the diagrams that the bleeding of the printed example in the invention is smaller and the printed image is clearer than those in the conventional method.
  • the ink height of the cylindrical model is reduced and the fixing time can be reduced. Therefore, for instance, the high speed printing by the multi-orifice head with orifices arranged corresponding to the A4 width can be also realized.
  • the dot shape is improved but also a printed image is constructed by dots smaller than those in the conventional method, so that there are also advantages such that the printed image is finely expressed and the printing quality is further improved.
  • 14 denotes an ink jet recording head cartridge of disposable type with plurality orifices of small areas provided at high density.
  • the cartridge 14 is fixed on a carriage 15 by a holding member 41. They are movable reciprocally along a shaft 21 in the longitudinal direction. While, a positioning with respect to the carriage 15 is defined, for example, by a hole at a support 300 and a dowel or the like at the side of the carriage 15. Further, the electrical connection may be formed by coupling a connector on the carriage 15 with a connection pad at a wiring plate 200.
  • An ink discharged from the orifice (not shown in Fig. 5) of the recording head 14 reaches a recording medium 18 of which recording surface is defined by a platen 19 slightly distant from the recording head, so that an image is formed on the recording medium 18.
  • the recording head is provided with a discharge signal according to an image data from suitable data source through a cable 16 and connection terminal coupled thereto.
  • a discharge signal according to an image data from suitable data source through a cable 16 and connection terminal coupled thereto.
  • the cartridge 14 one or plural ones (two in the drawing) may be used according ink colors used therein.
  • 17 denotes a carriage motor for scanning the carriage 15 along the shaft 21.
  • 22 denotes wire for transmitting a driving power of the motor 17 to the carriage 15.
  • 20 denotes a feed motor coupled with a platen roller 19 for conveying the recording medium 18.
  • two ink jet recording heads 14 are provided.
  • the head (b) is used.
  • the printing is executed according to the present invention.
  • high quality is not necessary while high speed printing is necessary, the head (a) is used.
  • normal printing is executed. That is, plural modes including mode for discharging ink droplets at the interval of 1/N of pitch of recording unit (N is a natural number of 2 or more), and mode for discharging the droplets at the interval of recording unit pitch are executed according to the recording method.
  • the present invention brings about excellent effects particularly in a recording head, recording device of the bubble jet system among the ink jet recording system.
  • the above system is applicable to either of the so called on-demand type and the continuous type.
  • the case of the on-demand type is effective because, by applying at least one driving signal which gives rapid temperature elevation exceeding nucleus boiling corresponding to the recording information on an electricity-heat converters arranged corresponding to the sheets or liquid channels holding liquid (ink), heat energy is generated at the electricity-heat converters to effect film boiling at the heat acting surface of the recording head, and consequently the bubbles within the liquid (ink) can be formed corresponding one by one to the driving signals.
  • the construction of the recording head in addition to the combination constructions of discharging orifice, liquid channel, electricity-heat converter (linear liquid channel or right angle liquid channel) as disclosed in the above-mentioned respective specifications, the construction by use of U.S.P. Nos. 4,558,333 and 4,459,600 disclosing the construction having the heat acting portion arranged in the flexed region is also included in the present invention.
  • the present invention can be also effectively made the construction as disclosed in Japanese Patent Laid-Open Application No. 59-123670 which discloses the construction using a slit common to a plurality of electricity-heat converters as the discharging portion of the electricity-heat converter or Japanese Patent Laid-Open Application No. 59-138461 which discloses the construction having the opening for absorbing pressure wave of heat energy correspondent to the discharging portion.
  • the recording head of the full line type having a length corresponding to the maximum width of recording medium which can be recorded by the recording device
  • either the construction which satisfies its length by combination of a plurality of recording heads as disclosed in the above-mentioned specifications or the construction as one recording head integrally formed may be used, and the present invention can exhibit the effects as described above further effectively.
  • the present invention is effective for a recording head of the freely exchangeable chip type which enables electrical connection to the main device or supply of ink from the main device by being mounted on the main device, or for the case by use of a recording head of the cartridge type provided integrally on the recording head itself.
  • a restoration means for the recording head, a preliminary auxiliary means, etc. provided as the construction of the recording device of the present invention is preferable, because the effect of the present invention can be further stabilized.
  • Specific examples of them may include, for the recording head, capping means, cleaning means, pressurization or aspiration means, electricity-heat converters or another heating element or preliminary heating means according to a combination of them, and it is also effective for performing stable recording to perform preliminary mode which performs discharging separate from recording.
  • the present invention is extremely effective for not only the recording mode only of a primary stream color such as black etc., but also a device equipped with at least one of plural different colors or full color by color mixing, whether the recording head may be either integrally constructed or combined in plural number.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)

Claims (12)

  1. Procédé d'enregistrement par jet d'encre, procédé dans lequel de l'encre est déchargée d'une tête (14) d'enregistrement par jet d'encre sous forme de gouttelettes pour définir une unité d'enregistrement simple, les gouttelettes de l'unité d'enregistrement étant déchargées à un intervalle qui est de 1/N d'un pas (P), lequel pas (P) est une distance entre des centres respectifs d'unités d'enregistrement adjacentes et N est un nombre naturel de 2 ou plus,
       lequel procédé est caractérisé en ce que :
       des gouttelettes adjacentes d'au moins deux unités d'enregistrement, qui sont adjacentes, sont déchargées à un intervalle qui est de 1/N dudit pas ; et
       lesdites gouttelettes, définissant une unité d'enregistrement simple, sont chacune d'un volume suffisant pour qu'elles recouvrent complètement, ensemble, l'étendue de ladite unité d'enregistrement.
  2. Procédé selon la revendication 1, dans lequel une unité d'enregistrement est définie par N² gouttelettes d'encre.
  3. Procédé selon la revendication 1, dans lequel ladite tête d'enregistrement par jet d'encre est d'un type série, et plusieurs opérations d'enregistrement sont effectuées pour définir chaque unité d'enregistrement.
  4. Procédé selon la revendication 3, dans lequel le nombre desdites opérations d'enregistrement est de deux.
  5. Procédé selon l'une quelconque des revendications précédentes :
       ayant non seulement un mode de décharge de gouttelettes d'encre audit intervalle qui est égal à 1/Nième pas, mais aussi
       un mode de décharge des gouttelettes à un intervalle d'un pas.
  6. Procédé selon l'une quelconque des revendications précédentes, lorsqu'il est mis en oeuvre en utilisant une tête d'enregistrement par jet d'encre qui est d'un type fonctionnant à la demande.
  7. Procédé selon la revendication 3 ou 4, dans lequel plusieurs points d'encre, ne constituant qu'une partie de ladite unité d'enregistrement, formés lors de chaque opération d'enregistrement respective, sont formés de manière à ne pas se recouvrir mutuellement.
  8. Procédé selon l'une quelconque des revendications précédentes, appliqué à un support d'enregistrement non couché.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel ladite tête (14) d'enregistrement à jet d'encre présente plusieurs orifices d'émission d'encre.
  10. Appareil pour un enregistrement par jet d'encre par le procédé selon la revendication 1, ledit appareil comportant :
       un ensemble à tête d'enregistrement par jet d'encre comprenant au moins une tête (14) d'enregistrement par jet d'encre destinée à décharger des gouttelettes d'encre pour former une multiplicité de points d'encre sur un support d'enregistrement ; et
       des moyens de commande pouvant coopérer avec ledit ensemble pour déterminer un emplacement d'un point d'encre sur ledit support d'enregistrement ; dans lequel
       ladite ou lesdites têtes d'enregistrement par jet d'encre et lesdits moyens de commande sont conçus pour composer une image dont chaque unité d'enregistrement comprend plusieurs points d'encre fusionnés, les points d'encre de chaque unité d'enregistrement étant enregistrés sur le support à un intervalle qui est de 1/N d'un pas (P), lequel pas est une distance entre les centres respectifs d'unités d'enregistrement adjacentes et N est un nombre naturel de 2 ou plus ;
       lequel appareil est caractérisé en ce que :
       des points adjacents d'au moins deux unités d'enregistrement, qui sont adjacentes, sont enregistrés à un intervalle qui est de 1/N dudit pas ; et
       lesdits moyens de commande peuvent coopérer avec ladite ou lesdites têtes (14) d'enregistrement par jet d'encre de manière que le volume de chaque gouttelette déchargée par la ou chaque orifice d'émission d'encre soit tel que les points d'encre fusionnés, correspondant chacun à une gouttelette respective et définissant ensemble chaque unité d'enregistrement simple, recouvrent complètement l'étendue de celle-ci.
  11. Appareil selon la revendication 10, dans lequel lesdits moyens de commande peuvent coopérer avec ladite ou lesdites têtes d'enregistrement par jet d'encre afin que lesdits points d'encre formant chaque unité d'enregistrement simple soient formés en plusieurs opérations d'enregistrement.
  12. Appareil selon la revendication 10 ou 11, dans lequel ladite tête (14) d'enregistrement par jet d'encre présente plusieurs orifices d'émission d'encre.
EP19900300277 1989-01-11 1990-01-10 Méthode d'enregistrement par jet d'encre Expired - Lifetime EP0378387B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP1002942A JP2795661B2 (ja) 1989-01-11 1989-01-11 インクジェット記録方法
JP1002941A JP2735852B2 (ja) 1989-01-11 1989-01-11 インクジェット記録方法
JP2942/89 1989-01-11
JP2941/89 1989-01-11

Publications (3)

Publication Number Publication Date
EP0378387A2 EP0378387A2 (fr) 1990-07-18
EP0378387A3 EP0378387A3 (fr) 1991-01-30
EP0378387B1 true EP0378387B1 (fr) 1995-05-17

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Application Number Title Priority Date Filing Date
EP19900300277 Expired - Lifetime EP0378387B1 (fr) 1989-01-11 1990-01-10 Méthode d'enregistrement par jet d'encre

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EP (1) EP0378387B1 (fr)
DE (1) DE69019380T2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0628415A3 (fr) * 1993-03-29 1995-03-29 Hewlett Packard Co Modes d'enregistrement haute fidélité.
US5975679A (en) * 1993-10-29 1999-11-02 Hewlett-Packard Company Dot alignment in mixed resolution printer
US5844583A (en) * 1994-07-14 1998-12-01 Seiko Epson Corporation Ink jet recording method and apparatus providing a plurality of image resolutions with the same amount of ink per dot
DE69535997D1 (de) 1994-12-29 2009-10-08 Canon Kk Tintenstrahlkopf mit verschiedenen Heizelementen pro Düse und Tintenstrahldrucker unter Verwendung desselben
US5984450A (en) * 1995-03-06 1999-11-16 Hewlett-Packard Company Inkjet printer having multiple printheads and multiple independent printhead service stations for performing different wiping procedures
DE69509627T2 (de) * 1995-03-06 1999-09-02 Hewlett Packard Co Punktausrichtung für Drucker mit gemischter Auflösung
JPH1058714A (ja) * 1996-07-01 1998-03-03 Xerox Corp 記録媒体の上に画像を印刷する方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050077A (en) * 1973-05-30 1977-09-20 Hitachi, Ltd. Liquid droplet supplying system
JPS5789973A (en) * 1980-11-27 1982-06-04 Nec Corp Ink jet printer
JPS5839468A (ja) * 1981-09-04 1983-03-08 Nippon Telegr & Teleph Corp <Ntt> インクジエツト記録の階調画像記録方式
US4617580A (en) * 1983-08-26 1986-10-14 Canon Kabushiki Kaisha Apparatus for recording on different types of mediums
US4758103A (en) * 1986-04-15 1988-07-19 International Business Machines Corporation Method and apparatus for quieting the operation of a dot matrix printer
US4748453A (en) * 1987-07-21 1988-05-31 Xerox Corporation Spot deposition for liquid ink printing

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Publication number Publication date
EP0378387A3 (fr) 1991-01-30
DE69019380D1 (de) 1995-06-22
EP0378387A2 (fr) 1990-07-18
DE69019380T2 (de) 1995-10-26

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