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EP0737585B1 - Druckvorrichtung - Google Patents

Druckvorrichtung Download PDF

Info

Publication number
EP0737585B1
EP0737585B1 EP96105732A EP96105732A EP0737585B1 EP 0737585 B1 EP0737585 B1 EP 0737585B1 EP 96105732 A EP96105732 A EP 96105732A EP 96105732 A EP96105732 A EP 96105732A EP 0737585 B1 EP0737585 B1 EP 0737585B1
Authority
EP
European Patent Office
Prior art keywords
printing device
metering
nozzle
ink
discharge opening
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
EP96105732A
Other languages
English (en)
French (fr)
Other versions
EP0737585A1 (de
Inventor
Makoto Ando
Toshiki Kagami
Koichiro Kishima
Tetsuo Nakayama
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of EP0737585A1 publication Critical patent/EP0737585A1/de
Application granted granted Critical
Publication of EP0737585B1 publication Critical patent/EP0737585B1/de
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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/1433—Structure of nozzle plates
    • 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
    • B41J2/14032—Structure of the pressure chamber
    • B41J2/1404—Geometrical characteristics
    • 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
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/211—Mixing of inks, solvent or air prior to paper contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14379—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
    • B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber

Definitions

  • This invention relates to a printing device capable of ejecting a liquid mixture composed, for example, of ink and a diluent toward a recording medium, and more particularly to an improvement in arrangement of nozzles.
  • So-called on-demand-type ink jet printer is adapted to form print images on a recording medium such as paper or film by ejecting ink droplets through nozzles in response to recording signals supplied to the printer.
  • a recording medium such as paper or film
  • the ink jet printer of such a on-demand type has been rapidly prevailed due to its compactness or low manufacturing cost.
  • USP 5,371,529 previously filed by the present applicant, discloses the printer of such a on-demand type in which a gradation of recorded images is achieved by mixing ink and a transparent solvent as diluent at adequate proportions with each other immediately before ejection thereof.
  • a concentration of the print images can be varied every recording dot, so that the printer is advantageous for obtaining a high quality duplicate of natural images such as particularly those from photographs.
  • the printer is of a so-called intermixing type in which ink and diluent are mixed together in an interior of the ejection nozzle.
  • the one-way valve has another problem that its manufacturing cost is high.
  • the present invention has been accomplished in view of the afore-mentioned problems.
  • a printing device including an ejecting nozzle with a first discharge opening and a metering nozzle with a second discharge opening, which are provided separately from each other to feed two kinds of fluids through the first and second discharge openings, respectively, the two kinds of fluids being mixed together to form a fluid mixture to be ejected toward a recording medium, wherein a distance d between the first and second discharge openings of the metering and ejecting nozzles is in the range of 0 ⁇ d ⁇ 5 ⁇ (S1) where S1 stands for an opening area of the first discharge opening of the ejecting nozzle.
  • a printing device including an ejecting nozzle having a first discharge opening and a plurality of metering nozzles each having a second discharge opening, which are provided separately from each other to feed fluids through the first and second discharge openings, the fluids being mixed together to form a fluid mixture to be ejected toward a recording medium, wherein a distance d between the first discharge opening of the ejecting nozzle and the second discharge opening of each of metering nozzles is in the range of 0 ⁇ d ⁇ 5 ⁇ (S1) where S1 stands for an opening area of the first discharge opening of the ejecting nozzle.
  • non-premixing-type printing device Preferred embodiments of a printing device according to the present invention are described in detail below by referring to the accompanying drawings.
  • the printing device described in the respective embodiments is provided with an ejecting nozzle and a metering nozzle separately.
  • ink and diluent are mixed together at an exterior of the ejecting nozzle.
  • non-premixing-type printing device Such a printing device is hereinafter referred to as "non-premixing-type printing device.”
  • such a printing device has an orifice plate in which the ejecting nozzle 1 and the metering nozzle 2 are separately provided.
  • the orifice plate 3 may be a plate-like or film-like member made of metal such as nickel or stainless steel, a ceramic material such as glass or silicon, or a plastic material such as polyimide or polyethylene terephthalete.
  • the ejecting nozzle 1 provided in the orifice plate 3 is in the form of a straight through hole extending in the direction of a thickness of the orifice plate 3.
  • the ejecting nozzle 1 is provided, at one end thereof, with a discharge opening 1a and, at the other end, with a supply opening 1b.
  • a transparent solvent 4 for example, a diluent is supplied through a diluent feed passage 5.
  • the metering nozzle 2 is also in the form of a through hole and defines a flow path inclined relative to the diluent feed passage 5 which communicates with the ejecting nozzle 1. That is, the metering nozzle 2 is provided at one end thereof with a discharge opening 2a serving as an ink orifice.
  • the inclination of the metering nozzle 2 relative to the ejecting nozzle 1 is such that the former gradually approaches the latter from a back side of the orifice plate 3 toward a front side thereof at which the discharge opening 2a is located.
  • the inclined flow path of the metering nozzle 2 is formed, for example, by a laser-machining process.
  • the orifice plate 3 which is made of a polyimide film having a thickness of 50 ⁇ m, is radiated with a excimer-laser beam at an angle of 43 degrees relative to a normal line of the orifice plate 3, though the inclination angle of the metering nozzle is not particularly limited.
  • the metering nozzle 2 is provided at the opposite end with a supply opening 2b to which a fluid, for example, ink 6, is supplied through an ink-feeding passage 7.
  • a fluid for example, ink 6
  • the discharge opening 1a of the ejecting nozzle 1 is of a point-symmetrical shape in section from a standpoint of achieving the function to eject fluid droplets.
  • the discharge opening 1a is preferably of a circular or square shape in section. In this embodiment, the discharge opening of a circular shape is adopted.
  • the metering nozzle 2 has a large degree of freedom with respect to the shape of the discharge opening 2a.
  • the shape of the discharge opening 2a is not limited to a circular shape but any shape such as, for example, an ellipsoidal shape, a triangular shape or a crescent shape as shown in Figs. 3A to 3C is applicable.
  • the discharge opening 2a having any of these shapes can be easily formed by varying the shape of a mask used in a laser-machining process. For example, if an intended shape of the discharge opening 2a is a circle, it can be formed by using a mask having an ellipsoidal shape.
  • the metering nozzle 2 and the ejecting nozzle 1 are separately disposed and a distance d between the discharge opening 1a of the ejecting nozzle 1 and the discharge opening 2a of the metering nozzle 2 is limited to the range of 0 ⁇ d ⁇ 5 ⁇ (S1), preferably 0 ⁇ d ⁇ 5( ⁇ m), where S1 stands for an opening area of the discharge opening 1a of the ejecting nozzle 1. If the distance d exceeds 5 ⁇ (S1), there is possibility that a responsibility for accurately determining an amount of ink is deteriorated.
  • the opening area S1 of the discharge opening 1a of the ejecting nozzle 1 is preferably in the range of 50 ⁇ S1 ⁇ 40,000 ⁇ m 2 , more preferably 100 ⁇ S1 ⁇ 10,000 ⁇ m 2 .
  • the upper limit of the opening area S1 is determined so as to obtain print images having a minimum resolution required.
  • the minimum resolution required is 75 dpi at 40,000 ⁇ m 2 and 200 dpi at about 10,000 ⁇ m 2 . Accordingly, when the opening area S1 exceeds 40,000 ⁇ m 2 , print images having the minimum resolution cannot be obtained.
  • the lower limit of the opening area S1 is determined so as to assure the discharge of fluid mixture through the ejecting nozzle. When the opening area S1 is less than 50 ⁇ m 2 , the fluid mixture cannot be ejected through the ejecting nozzle.
  • the opening area S2 of the discharge opening 2a of the metering nozzle 2 is preferably in the range satisfying the condition of 5/10,000 ⁇ S2/S1 ⁇ 10.
  • the ratio S2/S1 of the opening area S2 to the opening area S1 exceeds 10
  • the ratio S2/S1 is less than 5/10,000, the amount of ink to be metered at one metering cycle becomes too small.
  • the afore-mentioned opening area S2 is in the range satisfying the condition of 5/10,000 ⁇ S2/S1 ⁇ 5.
  • the ratio S2/S1 is preferably in the range of 1/100 ⁇ S2/S1 ⁇ 5.
  • the ratio S2/S1 is preferably in the range of 1/100 ⁇ S2/S1 ⁇ 1/2.
  • the transparent solvent 4 and ink 6 form a meniscus 8 at the discharge opening 1a of the ejecting nozzle 1 and a meniscus 9 at the discharge opening 2a of the metering nozzle 2, respectively, due to a surface tension thereof, as shown in Fig. 4A.
  • the metering nozzle 2 and the ejecting side nozzle 1 are independently provided and the distance d therebetween is limited to the afore-mentioned range, natural mixing of the transparent solvent 4 and the ink 6 in the stand-by condition can be surely prevented without provision of complicated mechanisms such as one-way valve.
  • An inner pressure of the metering nozzle 2 is raised by operating a pressure-applying means (not shown) such as a piezo-electric element or a heating element, so that the ink 6 is metered as shown in Fig. 4B.
  • the amount of the ink 6 to be mixed with the transparent solvent 4 is varied by controlling a voltage value of voltage pulse or a pulse width impressed on the pressure-applying means.
  • the application of voltage to the pressure-applying means provided on the metering side is interrupted, and a driving pulse is applied to another pressure-applying means provided on the ejecting side, so that the inner pressure in the metering nozzle 2 is lowered to a negative pressure while the inner pressure in the ejecting nozzle is raised.
  • the ink 6 is separated from the fluid mixture 10 composed of the ink 6 and the transparent solvent 4 and returned into the metering nozzle 2 so that the meniscus of the ink 6 is retracted to a position inside the metering nozzle 2, as shown in Fig. 4C.
  • the fluid mixture separated from the ink 6 projects outwardly from the discharge opening 1a of the ejecting nozzle 1, as shown in Fig. 4C.
  • the inner pressure in the ejecting nozzle 1 is reduced to a negative pressure.
  • the transparent solvent 4 is retracted into an interior of the ejecting nozzle 1 so that the fluid mixture 10 having a given ink concentration is ejected in the form of droplets.
  • the metering nozzle 2 After completion of the ink ejection, as shown in Fig. 4E, the metering nozzle 2 is charged with a fresh amount of ink 6 whereby the printer is returned to the initial stand-by condition.
  • This embodiment shows a printing device which is of the same non-premixing type as that of the Embodiment 1 but in which discharge openings of ejecting and metering nozzles are not located on the same plane.
  • such a printing device also includes an orifice plate 13 in which an ejecting nozzle 11 and a metering nozzle 12 are provided separately from each other.
  • the ejecting nozzle 11 is in the form of a straight through-hole and penetrates the orifice plate 13 in the thickness direction in the same manner as the afore-mentioned Embodiment 1.
  • the ejecting nozzle 11 has, at one end thereof, a discharge opening 11a serving as a diluent orifice and, at the other end thereof, a supply opening 11b into which the transparent solvent 4 as a diluent is introduced through the diluent feed passage 5.
  • the metering nozzle 12 is provided within a protrusion 14 projectingly formed on the orifice plate 13.
  • the protrusion 14 has a rectangular shape in front elevation and projects outwardly from a plane where the discharge opening 11a of the ejecting nozzle 11 is located.
  • the metering nozzle 12 has such a configuration that a discharge opening 12a thereof is opened at a plane perpendicular to the plane where the discharge opening 11a of the ejecting nozzle 11 is located. This configuration makes it easier to mix the ink 6 with the transparent solvent 4.
  • the metering nozzle 12 further has, at the other open end, a supply opening 12b which communicates with a ink feed passage 7 for supplying the ink 6 to the metering nozzle 12.
  • the orifice plate 13 may be provided thereon with multiple plated layers each made of nickel, copper or the like.
  • a distance d between the discharge opening 11a of the ejecting nozzle 11 and the discharge opening 12a of the metering nozzle 12 is so determined as to fall within the same range as described in the afore-mentioned Embodiment 1.
  • an opening area S1 of the discharge opening 11a of the ejecting nozzle 11 and an opening area S2 of the discharge opening 12a of the metering nozzle 12 are so determined as to satisfy the same conditions as described in the afore-mentioned Embodiment 1.
  • the discharge openings 11a and 12a of the ejecting and metering nozzles 11 and 12 can have various shapes as mentioned in Embodiment 1.
  • the printing device of this embodiment can be operated in the same manner as described in Embodiment 1.
  • This embodiment illustrates a printing device which is of the same non-premixing type as that of the Embodiment 1 but in which discharge openings of ejecting and metering nozzles are not located on the same plane.
  • the metering nozzle is also arranged in an inclined relation to the ejecting nozzle.
  • such a printing device also includes an orifice plate 17 in which an ejecting nozzle 15 and a metering nozzle 16 are provided separately from each other.
  • the ejecting nozzle 15 is in the form of a straight through-hole and extends through the orifice plate 17 in the direction of a thickness thereof in the same manner as the afore-mentioned Embodiment 1.
  • the ejecting nozzle 15 has, at one end thereof, a discharge opening 15a serving as a diluent orifice and, at the other end thereof, a supply opening 15b into which the transparent solvent 4 as a diluent is introduced through the diluent feed passage 5 in the same manner as described in the afore-mentioned Embodiment 1.
  • the metering nozzle 16 is provided in an enlarged portion of the orifice plate 17 which has a larger thickness than that of a portion where the ejecting nozzle 15 is located.
  • the metering nozzle 16 is also inclined toward the ejecting nozzle 15 to make it easier to mix the ink 6 with the transparent solvent 4.
  • a discharge opening 16a of the metering nozzle 16 is opened at a slant surface 18 provided on the enlarged portion of the orifice plate 17.
  • the metering nozzle 16 is provided, at the other end, a supply opening 16b which communicates with the ink feed passage 7 to introduce the ink 6 into the metering nozzle 16.
  • the orifice plate 17 can be produced by subjecting a plastic sheet to a hole-forming process in which an excimer-laser is employed.
  • a distance d between the discharge opening 15a of the ejecting nozzle 15 and the discharge opening 16a of the metering nozzle 16 is so determined as to fall within the same range as described in the afore-mentioned Embodiment 1.
  • an opening area S1 of the discharge opening 15a of the ejecting nozzle 15 and an opening area S2 of the discharge opening 16a of the metering nozzle 16 are so determined as to satisfy the same conditions as described in the afore-mentioned Embodiment 1.
  • the discharge openings 15a and 16a of the ejecting and metering nozzles 15 and 16 can have various shapes as mentioned in Embodiment 1.
  • the printing device of this embodiment can be also operated in the same manner as described in Embodiment 1.
  • Embodiment 4 shows a so-called end-face type printing device having no orifice plate.
  • a primary surface of a base 19 made of stainless steel or the like is grooved by using etching or the like methods to form two channels thereon.
  • the thus-formed two channels serving respectively as a metering nozzle 20 and an ejecting nozzle 21 is covered with a cover plate 22 adhered onto the primary surface of the base 19.
  • a distance between discharge openings of the metering nozzle 20 and the ejecting nozzle 21 is so determined as to satisfy the same conditions as described in Embodiment 1.
  • an opening area S1 of the discharge opening of the ejecting nozzle 21 and an opening area S2 of the discharge opening of the metering nozzle 20 are so determined as to satisfy the same conditions as described in the afore-mentioned Embodiment 1.
  • the discharge openings of the ejecting and metering nozzles 21 and 20 can have various shapes as mentioned in Embodiment 1.
  • the printing device of this embodiment can be also operated in the same manner as described in Embodiment 1.
  • This embodiment shows a printing device which is a combination of the end-face type having no orifice plate, and the non-premixing type having a plurality of metering nozzles.
  • Such a printing device has substantially the same configuration as that of the printing device described in Embodiment 4.
  • a primary surface 31a of a base plate 31 is grooved to form a first channel 34 which defines a diluent feed passage 32 for the transparent solvent as a diluent and an ejecting nozzle 33 communicated with the diluent feed passage 32, a second channel 37 which defines a first ink feed passage 35 for the ink and a first metering nozzle 36 communicated with the first ink feed passage 35, and a third channel 40 which defines a second ink feed passage 38 and a second metering nozzle 39 communicated with the second ink feed passage 38.
  • the first channel 34 is so arranged as to be interposed between the second and third channels 37 and 40.
  • the first to third channels are covered by a diaphragm 41 adhered onto the primary surface 31a of the base plate 31 to finally define the respective nozzles and passages.
  • the transparent solvent as a diluent is supplied through the diluent feed passage 32 to the ejecting nozzle 33.
  • the ink is supplied through the first and second ink feed passages 35 and 38 to the first and second metering nozzles 36 and 39, respectively.
  • the afore-mentioned channel 34 is in the form of a droplet when viewed in top plan and has a relatively wide portion serving as the diluent feed passage 32 and a relatively narrow portion serving as the ejecting nozzle 33 and gradually tapered in width toward an open end thereof.
  • the second and third channels 37 and 40 are also of a droplet shape in top plan and further inclined relative to the ejecting nozzle 33 in order to facilitate metering and emerging of the ink and mixing of the ink with the transparent solvent.
  • the second and third channels 37 and 40 each have a relatively wide portion serving as the first or second ink feed passage 35 or 38 and a relatively narrow portion serving as the first or second metering nozzle 36 or 39 and gradually tapered in width toward an open end thereof.
  • the ejecting nozzle 33 is interposed between the first and second metering nozzles 36 and 39 such that the discharge openings of these nozzles are arranged adjacent to each other at one end face of the base plate 31.
  • the base plate 31 and the diaphragm 41 may be made of metal such as nickel and stainless steel, a ceramic material such as glass and silicon, or a plastic material such as polyimide and polyethylene terephthalate.
  • the formation of the channels on the primary surface 31a of the base plate 31 can be performed by etching, injecting-molding or other adequate methods depending upon the kind of material used therefor.
  • the first and second metering nozzle 36 and 39 and the ejecting nozzle 33 are separately disposed and a distance d between the discharge opening of the ejecting nozzle 33 and the discharge opening of the first or second metering nozzle 36 or 39 is limited to the same range as described in the afore-mentioned Embodiment 1.
  • an opening area S1 of the discharge opening of the ejecting nozzle 33 and an opening area S2 of the discharge opening of the first or second metering nozzle 36 and 39 are so determined as to satisfy the same conditions as described in the afore-mentioned Embodiment 1.
  • the discharge openings of the ejecting nozzle 33 and the first and second metering nozzles 36 and 39 may be of various shapes as mentioned in Embodiment 1.
  • the diaphragm 41 is provided, at respective positions opposed to the diluent feed passage 32 and the first and second ink feed passages 35 and 38, with laminate-type piezo-electric elements 42, 43 and 44 as pressure-applying means.
  • the printing device can be operated in substantially the same manner as described in Embodiment 1. That is, one medium supplied from the ejecting nozzle 33 is mixed with the other medium supplied from the first metering nozzle 36 and/or the second metering nozzle 39 and the resultant fluid mixture is ejected toward a recording medium such as paper.
  • the printing device of this embodiment when the first and second ink feed passages 35 and 38 are charged with ink having the same color tone and the same concentration, it is possible to supply a given amount of ink metered through either or both of the first and second metering nozzles.
  • the fluid mixture having a high ink concentration can be ejected by supplying the metered ink through both the first and second metering nozzles.
  • a pressure-applying means such as a piezoelectric element is employed under a high-power condition, there is a tendency that its responsibility to a pulse width of a supply voltage and the voltage level is deteriorated.
  • a given amount of ink metered is supplied from both the first and second metering nozzles 36 and 39 so that the deterioration of the mixing accuracy does not occur but it is rather improved, whereby print images with a high accuracy can be obtained.
  • metering of ink in the fluid mixture to be ejected can be performed by selecting either one of the first and second metering nozzles 36 and 39 depending upon intended concentration of the fluid mixture. This permits a wider dynamic range of the concentration of the fluid mixture and a higher resolution of the print images recorded than those obtained in the conventional printing devices.
  • the printing device when the first and second ink feed passages 35 and 38 are charged with ink compositions having different color tones, two kinds of fluid mixtures each composed of diluent and either one of ink compositions having different color tones can be selectively ejected from the single nozzle unit. This enables reduction in total number of nozzles and size of the printing device. In this case, when the different ink compositions are supplied from the metering nozzles at the same time, it is possible to eject the fluid mixture having a mixed color tone.
  • This embodiment shows a printing device which is also a combination of the end-face type having no orifice plate, and the non-premixing type having a plurality of metering nozzles.
  • Such a printing device has substantially the same configuration as that of the printing device described in Embodiment 5.
  • a primary surface 51a of a base plate 51 is grooved to form a first channel 54 which defines a diluent feed passage 52 for the transparent solvent as a diluent and an ejecting nozzle 53 communicated with the diluent feed passage 52, a second channel 57 which defines a first ink feed passage 55 and a first metering nozzle 56 communicated with the first ink feed passage 55, and a third channel 60 which defines a second ink feed passage 58 and a second metering nozzle 59 communicated with the second ink passage 58.
  • the first channel 54 is so arranged as to be interposed between the second and third channels 57 and 60.
  • the first to third channels are covered with an oscillation plate 41 adhered onto the primary surface 51a of the base plate 51 to finally define the respective ink feed and diluent feed passages and the ejecting and metering nozzles.
  • the base plate 51 is further provided, on a back surface 51b thereof opposite to the primary surface 51a, with a fourth channel 64 which defines a third ink feed passage 62 and a third metering nozzle 63 communicated with the third ink feed passage 62.
  • the fourth channel 64 on the back surface 51b is disposed in an opposed relation to the first channel 54 on the primary surface 51a.
  • the fourth channel 64 is covered with an oscillation plate 65 to finally define the third ink feed passage 62 and the third metering nozzle 63.
  • the transparent solvent as a diluent is supplied through the diluent feed passage 52 to the ejecting nozzle 53 and the ink is supplied through the first, second and third ink feed passages 55, 58, and 62 to discharge opening of the first, second and third metering nozzles 56, 59 and 63, respectively.
  • the first, second and third channels 54, 57 and 60 may each have a similar shape to those of the first, second and third channels 34, 37 and 40 of the afore-mentioned Embodiment 4, respectively.
  • the fourth channel may be of an approximately droplet shape in top plan and has a relatively wide portion which defines the third ink feed passage 62 and a relatively narrow portion which defines the third metering nozzle 63.
  • the ejecting nozzle 53 is so arranged as to be interposed between the first and second metering nozzles 56 and 59 and opposed to the third metering nozzle 63 in the direction of a thickness of the base plate 51.
  • the base plate 51 and the diaphragms 61 and 65 may be made of the same materials as those described in the preceding Embodiment 5.
  • the formation of the channels on the primary and back surfaces of the base plate 51 can be also performed in the same manner as described in Embodiment 5.
  • the first, second and third metering nozzles 56, 59 and 63 and the ejecting nozzle 53 are separately disposed and a distance d between the discharge opening of the ejecting nozzle 53 and the discharge opening of each of the first, second and third metering nozzles 56, 59 and 63 is limited to the same range as described in the afore-mentioned Embodiment 1.
  • an opening area S1 of the discharge opening of the ejecting nozzle 53 and an opening area S2 of the discharge opening of each of the first, second and third metering nozzles 56, 59 and 63 are so determined as to satisfy the same conditions as described in the afore-mentioned Embodiment 1.
  • the discharge openings of the ejecting nozzle 53 and the first, second and third metering nozzles 56, 59 and 63 may be of various shapes as described above, though there is some limitation.
  • the diaphragm 61 is provided, at respective positions opposed to the diluent feed passage 52 and the first and second ink feed passages 55 and 58, with laminate-type piezo-electric elements 66, 67 and 68 as pressure-applying means and the oscillation plate 65 is provided, on an outside surface thereof opposed to the third ink feed passages 62, with laminate-type piezo-electric elements 69 as a pressure-applying means
  • the printing device can be operated in substantially the same manner as described in Embodiment 1. That is, one medium supplied from the ejecting nozzle 53 is mixed with the other medium supplied from at least one of the first, second and third metering nozzles 56, 59 and 63 and the resultant fluid mixture is ejected toward a recording medium such as paper.
  • the first, second and third ink feed passages 55, 58, and 62 are charged with ink having the same color tone and the same concentration, it is possible to supply a given amount of ink metered through either or both of the first, second and third metering nozzles.
  • the first, second and third ink feed passages 55, 57, and 62 can be charged with ink compositions which are the same in color tone thereof but different in concentration from each other. This permits attainment of the same effects as described in Embodiment 5.
  • the first, second and third metering nozzles are respectively supplied with ink compositions having different color tones, e.g., yellow, magenta and cyan, fluid mixtures each composed of diluent and either one of ink compositions having different color tones can be selectively ejected from the single nozzle unit.
  • ink compositions having different color tones e.g., yellow, magenta and cyan
  • fluid mixtures each composed of diluent and either one of ink compositions having different color tones can be selectively ejected from the single nozzle unit.
  • This enables reduction in total number of nozzles and size of the printing device.
  • the different ink compositions are supplied from the metering nozzles at the same time, it is possible to eject the fluid mixture having various mixed color tones whereby a full-colored print images can be obtained.
  • This embodiment shows a printing device which is also a combination of the end-face type having no orifice plate, and the non-premixing type having a plurality of metering nozzles.
  • Such a printing device has substantially the same configuration as that of the printing device described in Embodiment 5.
  • a primary surface 71a of a base plate 71 is grooved to form a first channel 74 which defines a diluent feed passage 72 for the transparent solvent as a diluent and an ejecting nozzle 73 communicated with the diluent feed passage 72, a second channel 77 which defines a first ink feed passage 75 and a first metering nozzle 76 communicated with the first ink feed passage 75, and a third channel 80 which defines a second ink feed passage 78 and a second metering nozzle 79 communicated with the second ink passage 78.
  • the first channel 74 is so arranged as to be interposed between the second and third channels 77 and 80.
  • the first to third channels are covered with an oscillation plate 81 adhered onto the primary surface 71a of the base plate 71 to finally define the respective ink feed and diluent feed passages and the ejecting and metering nozzles.
  • the base plate 71 is further provided, on a back surface 71b thereof opposite to the primary surface 71a, with a fourth channel 84 which defines a third ink feed passage 82 and a third metering nozzle 83 communicated with the third ink feed passage 82, and a fifth channel which defines a fourth ink feed passage 85 and a fourth metering nozzle 86 communicated with the fourth ink feed passage 85.
  • the fourth and fifth channels 84 and 87 on the back surface 71b are disposed in an opposed relation to the second and third channel 77 and 80 on the primary surface 71a, respectively.
  • the fourth and fifth channels 84 and 87 are covered with an oscillation plate 88 adhered to the back surface 71b of the base plate 71 to finally define the third and fourth ink feed passage 82 and 85 and the third and fourth metering nozzle 83 and 86.
  • the transparent solvent as a diluent is supplied through the diluent feed passage 72 to the ejecting nozzle 73 and the ink is supplied through the first, second, third and fourth ink feed passages 75, 78, 82 and 85 to discharge openings of the first, second, third and fourth metering nozzles 76, 79, 83 and 86, respectively.
  • the first, second and third channels 74, 77 and 80 may have similar shapes to those of the first, second and third channels 34, 37 and 40 of the afore-mentioned Embodiment 5, respectively.
  • the fourth and fifth channels 84 and 87 may have approximately droplet shapes in top plan which correspond respectively to the shapes of the second and third channels 77 and 80 and are each formed with a relatively wide portion which defines the third or fourth ink feed passage 82 or 85 and a relatively narrow portion which defines the third or fourth metering nozzle 83 or 86.
  • the ejecting nozzle 73 is so arranged as to be interposed between the first and second metering nozzles 76 and 79.
  • the first and second metering nozzles 76 and 79 are so arranged as to be opposed to and aligned with the third and fourth metering nozzles 83 and 86 in the direction of a thickness of the base plate 71.
  • the base plate 71 and the diaphragms 81 and 88 may be made of the same materials as those used in the preceding Embodiment 5.
  • the formation of the channels on the primary and back surfaces 71a and 71 b of the base plate 71 can be performed in the same manner as described in Embodiment 5.
  • the first, second, third and fourth metering nozzles 76, 79, 83 and 86 and the ejecting nozzle 73 are independently disposed and a distance d between the discharge opening of the ejecting nozzle 73 and the discharge opening of each of the first, second, third and fourth metering nozzles 76, 79, 83 and 86 is limited to the same range as described in the afore-mentioned Embodiment 1.
  • an opening area S1 of the discharge opening of the ejecting nozzle 73 and an opening area S2 of the discharge opening of each of the first, second, third and fourth metering nozzles 76, 79, 83 and 86 are so determined as to satisfy the same conditions as described in the afore-mentioned Embodiment 1.
  • the discharge openings of the ejecting nozzle 73 and the first, second, third and fourth metering nozzles 76, 79, 83 and 86 may have various shapes as described in the preceding embodiments, though there is some limitation due to the fact that they must be defined by the respective channels and the diaphragms 81 and 88.
  • laminate-type piezo-electric elements 89, 90 and 91 as pressure-applying means are provided on the oscillation plate 81 at the respective positions corresponding to the diluent feed passage 72 and the first and second ink feed passages 75 and 78.
  • laminate-type piezoelectric elements 92 and 93 also serving as pressure-applying means are provided on the oscillation plate 88 at the respective positions corresponding to the third and fourth ink feed passages 82 and 85.
  • the printing device can be operated in substantially the same manner as described in Embodiment 1. That is, one medium supplied from the ejecting nozzle 73 is mixed with the other medium supplied from at least one of the first, second, third and fourth metering nozzles 76, 79, 83 and 86 and the resultant fluid mixture is ejected toward a recording medium such as paper.
  • the first, second, third and fourth ink feed passages 75, 78, 82 and 85 are charged with ink compositions having the same color tone and the same concentration.
  • the first, second, third and fourth ink feed passages 75, 78, 82 and 85 can be charged with ink compositions having the same color tone but different concentrations. This permits attainment of the same effects as described in Embodiment 5.
  • the first, second, third and fourth metering nozzles are respectively supplied with ink compositions having different color tones, e.g., yellow, magenta, cyan and black
  • various fluid mixtures which are each composed of the diluent and either one of ink compositions having different color tones, can be selectively ejected from the single nozzle unit. This enables reduction in total number of nozzles and size of the printing device.
  • the different ink compositions are supplied from the metering nozzles at the same time at proper proportions, it is possible to eject the fluid mixture having various mixed color tone whereby a full-colored print images can be obtained.
  • the ejecting nozzle and the metering nozzles are so arranged that center lines of the latter intersects that of the former.
  • the present invention is not restricted to such a particular arrangement.
  • the center lines of the ejecting and metering nozzles can be disposed in skewed relation or parallel to each other.
  • a printing device since metering and ejecting nozzles are provided separately from each other, there is no likelihood that ink and a diluent therefor are mixed together in a stand-by condition of the printing device whereby it is surely prevented to cause natural mixing of the ink and the diluent upon ejection of the fluid mixture.
  • This enables simplified construction of the printing device and permits stable mixing and ejecting operations of the fluid mixture composed of the ink and the diluent without complicated mechanisms such as valves, which leads to simplification of manufacturing processes and reduction in its manufacturing cost.
  • a distance d between discharge openings of the metering and ejecting nozzles is limited to a particular range, a good metering responsibility to fluid to be metered can be obtained and improved mixing and ejecting operations for the fluid mixture composed of the ink and the diluent can be surely performed.

Landscapes

  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (10)

  1. Druckvorrichtung mit einer Ausstoßdüse mit einer ersten Auslassöffnung sowie einer Dosierdüse mit einer zweiten Auslassöffnung, die getrennt voneinander vorhanden sind, um zwei Arten von Flüssigkeiten durch die erste bzw. zweite Auslassöffnung zuzuführen, wobei diese zwei Arten von Flüssigkeiten miteinander gemischt werden, um ein zu einem Aufzeichnungsträger auszustoßendes Flüssigkeitsgemisch zu bilden,
    wobei der Abstand d zwischen der ersten und zweiten Auslassöffnung der Ausstoß- und der Dosierdüse im Bereich 0 ≤ d ≤ 5√(S1) liegt, wobei S1 für die Öffnungsfläche der ersten Auslassöffnung der Ausstoßdüse steht.
  2. Druckvorrichtung nach Anspruch 1, bei der die Öffnungsfläche S1 der ersten Auslassöffnung der Ausstoßdüse im Bereich 50 ≤ S1 ≤ 40000 µm2 liegt.
  3. Druckvorrichtung nach Anspruch 1, bei der die zweite Auslassöffnung eine Öffnungsfläche S2 aufweist und das Verhältnis aus der Öffnungsfläche S2 zur Öffnungsfläche S1 im Bereich 5/10000 ≤ S2/S1 ≤ 10 liegt.
  4. Druckvorrichtung nach Anspruch 1, bei der die zwei Arten von Flüssigkeiten Tinte und ein Verdünnungsmittel sind.
  5. Druckvorrichtung mit einer Ausstoßdüse mit einer ersten Auslassöffnung sowie mehreren Dosierdüsen mit jeweils einer zweiten Auslassöffnung, die getrennt voneinander vorhanden sind, um durch die ersten und zweiten Auslassöffnungen Flüssigkeiten zuzuführen, die miteinander gemischt werden, um ein zu einem Aufzeichnungsträger auszustoßendes Flüssigkeitsgemisch zu bilden,
    wobei der Abstand d zwischen der ersten Auslassöffnung der Ausstoßdüse und der zweiten Auslassöffnung jeder der mehreren Dosierdüsen im Bereich 0 ≤ d ≤ 5√(S1) liegt, wobei S1 für die Öffnungsfläche der ersten Auslassöffnung der Ausstoßdüse steht.
  6. Druckvorrichtung nach Anspruch 5, bei der die Öffnungsfläche S1 der ersten Auslassöffnung der Ausstoßdüse im Bereich 50 ≤ S1 ≤ 40000 µm2 liegt.
  7. Druckvorrichtung nach Anspruch 5, bei der die zweite Auslassöffnung eine Öffnungsfläche S2 aufweist und das Verhältnis aus der Öffnungsfläche S2 zur Öffnungsfläche S1 im Bereich 5/10000 ≤ S2/S1 ≤ 10 liegt.
  8. Druckvorrichtung nach Anspruch 5, bei der die Ausstoßdüse so ausgebildet ist, dass sie ein Verdünnungsmittel liefert, und die mehreren Dosierdüsen so ausgebildet sind, dass sie verschiedene Tintenzusammensetzungen liefern, die denselben Farbton aber von voneinander verschiedene Konzentrationen aufweisen.
  9. Druckvorrichtung nach Anspruch 5, bei der die Ausstoßdüse so ausgebildet ist, dass sie ein Verdünnungsmittel liefert, und die mehreren Dosierdüsen so ausgebildet sind, dass sie verschiedene Tintenzusammensetzungen liefern, die voneinander verschiedene Farbtöne aufweisen.
  10. Druckvorrichtung nach Anspruch 5, bei der die Ausstoßdüse so ausgebildet ist, dass sie ein Verdünnungsmittel liefert und die mehreren Dosierdüsen so ausgebildet sind, dass sie Tintenzusammensetzungen liefern, die sowohl denselben Farbton als auch dieselbe Konzentration aufweisen.
EP96105732A 1995-04-14 1996-04-11 Druckvorrichtung Expired - Lifetime EP0737585B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP88999/95 1995-04-14
JP8899995 1995-04-14

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EP0737585A1 EP0737585A1 (de) 1996-10-16
EP0737585B1 true EP0737585B1 (de) 1999-01-13

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KR (1) KR960037289A (de)
CN (1) CN1142855C (de)
DE (1) DE69601318T2 (de)

Cited By (2)

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US8883392B2 (en) 2000-03-13 2014-11-11 Stratasys Ltd. Compositions and methods for use in three dimensional model printing
US8932511B2 (en) 2000-03-13 2015-01-13 Stratasys Ltd. Method of making a composite material by three-dimensional ink-jet printing

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US6139134A (en) * 1996-10-14 2000-10-31 Sony Corporation Printer
JPH1199651A (ja) * 1997-07-31 1999-04-13 Canon Inc 液体吐出方法及び液体吐出装置
EP1078761B1 (de) * 1999-08-27 2008-10-29 Océ-Technologies B.V. Tintenstrahldruckkopfkanalstruktur
DE60040637D1 (de) 1999-08-27 2008-12-11 Oce Tech Bv Tintenstrahldruckkopfkanalstruktur
US20030207959A1 (en) 2000-03-13 2003-11-06 Eduardo Napadensky Compositions and methods for use in three dimensional model printing
US6569373B2 (en) * 2000-03-13 2003-05-27 Object Geometries Ltd. Compositions and methods for use in three dimensional model printing
DE10224128A1 (de) * 2002-05-29 2003-12-18 Schmid Rhyner Ag Adliswil Verfahren zum Auftrag von Beschichtungen auf Oberflächen
US7077334B2 (en) * 2003-04-10 2006-07-18 Massachusetts Institute Of Technology Positive pressure drop-on-demand printing
JP4298697B2 (ja) * 2005-11-25 2009-07-22 キヤノン株式会社 インクジェット記録ヘッド、インクジェット記録ヘッドを備えるインクジェットカートリッジ、及びインクジェット記録装置
GB2438180A (en) * 2006-05-16 2007-11-21 Cametrics Ltd Ink jet printing methods
EP1935659B1 (de) * 2006-12-21 2009-11-11 Agfa Graphics N.V. Tintenstrahldruckverfahren und -tintensätze
CA2690388A1 (en) * 2007-06-14 2008-12-24 Massachusetts Institute Of Technology Method and apparatus for depositing films
US20190118534A1 (en) * 2017-10-24 2019-04-25 Toshiba Tec Kabushiki Kaisha Fluid ejection head and fluid ejection apparatus
US11033924B2 (en) * 2018-01-31 2021-06-15 Universal Display Corporation Organic vapor jet print head with orthogonal delivery and exhaust channels

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DE3501905A1 (de) * 1983-08-01 1985-12-12 Veb Kombinat Robotron, Ddr 8012 Dresden Verfahren zum farbigen aufzeichnen von informationen mittels tintenstrahl
US4614953A (en) * 1984-04-12 1986-09-30 The Laitram Corporation Solvent and multiple color ink mixing system in an ink jet
JP3161635B2 (ja) * 1991-10-17 2001-04-25 ソニー株式会社 インクジェットプリントヘッド及びインクジェットプリンタ

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8883392B2 (en) 2000-03-13 2014-11-11 Stratasys Ltd. Compositions and methods for use in three dimensional model printing
US8932511B2 (en) 2000-03-13 2015-01-13 Stratasys Ltd. Method of making a composite material by three-dimensional ink-jet printing
US9334402B2 (en) 2000-03-13 2016-05-10 Stratasys Ltd. Compositions and methods for use in three dimensional model printing
US10335994B2 (en) 2000-03-13 2019-07-02 Stratasys Ltd Methods for three-dimensional model printing

Also Published As

Publication number Publication date
DE69601318T2 (de) 1999-08-26
KR960037289A (ko) 1996-11-19
CN1140660A (zh) 1997-01-22
EP0737585A1 (de) 1996-10-16
CN1142855C (zh) 2004-03-24
DE69601318D1 (de) 1999-02-25

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