EP0376922A1 - Tintenstrahldrucker - Google Patents

Tintenstrahldrucker Download PDF

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Publication number
EP0376922A1
EP0376922A1 EP90100880A EP90100880A EP0376922A1 EP 0376922 A1 EP0376922 A1 EP 0376922A1 EP 90100880 A EP90100880 A EP 90100880A EP 90100880 A EP90100880 A EP 90100880A EP 0376922 A1 EP0376922 A1 EP 0376922A1
Authority
EP
European Patent Office
Prior art keywords
ink
air
discharge ports
jet recording
nozzle plate
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
Application number
EP90100880A
Other languages
English (en)
French (fr)
Other versions
EP0376922B1 (de
Inventor
Gen Oda
Masayoshi Miura
Kenji Akami
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 JP17790785A external-priority patent/JPS6239249A/ja
Priority claimed from JP17790885A external-priority patent/JPS6239250A/ja
Priority claimed from JP60195126A external-priority patent/JPH064321B2/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to EP19900100880 priority Critical patent/EP0376922B1/de
Publication of EP0376922A1 publication Critical patent/EP0376922A1/de
Application granted granted Critical
Publication of EP0376922B1 publication Critical patent/EP0376922B1/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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
    • B41J2002/061—Ejection by electric field of ink or of toner particles contained in 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
    • B41J2002/14387—Front 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
    • B41J2202/02—Air-assisted ejection

Definitions

  • the present invention relates to an ink jet recording apparatus for utilizing air streams to eject ink to record characters, images, or the like on a recording medium.
  • the ink jet recording head designated by the reference numeral 112 includes a body 101, an air nozzle plate 102 of an insulating material attached to the outer end of an outer wall 101a of the body 101, and an ink nozzle plate 103 of an insulating material attached to the outer end of an inner wall 101b of the body 101.
  • the outer and inner walls 101a, 101b of the body 101 define therebetween an air chamber 104 communicating with an air passage 105 defined between the air nozzle plate 102 and the ink nozzle plate 103.
  • the body 101 has an ink chamber 106 defined inwardly of and by the ink nozzle plate 103 and the inner wall 101b.
  • the ink nozzle plate 103 has a plurality of ink discharge ports 107, and the air nozzle plate 101 has a pluraltiy of air discharge ports 108 in alignment with the ink discharge ports 107, respectively.
  • a common electrode 109 of flat configuration is mounted on the outer surface of the air nozzle plate 102 around the air discharge ports 108.
  • Separate control electrodes 110 are mounted on the inner surface of the ink nozzle plate 103 around the ink discharge ports 107.
  • the electrodes 101 110 are connnected to signal sources 111.
  • An air supply passage 113 has an end connected to the air chamber 104, and an ink supply passage 114 has an end connected to the ink chamber 106.
  • FIG. 3 shows an overall arrangement of an ink jet recording apparatus incorporating the ink jet recording head 112.
  • the other end of the air supply passage 113 is coupled to an air source 115, and the other end of the ink supply passage 114 is coupled to an ink tank 116.
  • An air supply passage 117 branched from the air supply passage 113 is connected to an upper end of the ink tank 116.
  • This type of apparatus is known from JP-A-58/220758. It operates as follows. Air is supplied from the air source 115 via the air supply passage 113 into the air chamber 104, from which it flows through a sharp as an air layer into the air passage 105 at a constant speed. The air flow is sharply bent in the vicinity of the air discharge ports 108 and the ink discharge ports 107 and goes into the air discharge ports 108.
  • the ink chamber 106 is always filled with ink fed from the ink tank 116 through the ink supply passage 114. The ink in the ink tank 116 and the ink chamber 106 is subjected to a constant pressure by the pressure of air supplied from the air source 115 via the air supply passage 117 into the ink tank 116.
  • the pressure of the ink in the ink discharge ports 107 is substantially equalized under the constant pressure to the pressure of air flowing near the ink discharge ports 107 while the ink jet recording head is not in operation, so that the meniscus of the ink in the ink discharge ports 107 is held at rest.
  • the meniscus of the ink in the ink discharge ports 107 is stretched toward the air discharge ports 108 by an electrostatic force produced by the potential difference.
  • FIG. 4 schematically shows the arrangement of FIG. 2 as a simplified system. Conditions for stably holding the ink in the ink discharge ports 107 will be described with reference to FIG. 4.
  • the pressure Pa of air delivered into the air chamber 104 is substantially equal to the air pressure in the air source 115 if the air supply passage 113 from the air source 115 to the head 112 has no pressure loss or only a negligible pressure loss.
  • the pressure Pi of ink in the ink chamber 106 is substantially equal to the ink pressure in the ink tank 116 and also the air pressure in the air source 115. Therefore, assuming that the air supply passages 113, 117 have no pressure loss or only a negligible pressure loss, the air pressure Pa is approximately equal to Pi.
  • the ink pressure Pi in the ink discharge port 117 is required to be substantially equal to the air pressure Pn in the vicinity of the ink discharge port 107. Therefore, the conventional ink jet recording head has been dimensionally and structurally designed to reduce the pressure loss of the air in the air passage 105 between the air and ink nozzle plates 102, 103 so that the air pressure Pa is approximately equal to the air pressure Pn to make the air and ink pressures Pa, Pi approximately equal to each other, thus stably keeping the meniscus 118 at the ink discharge port 107.
  • the air passage 105 has a small thickness of about 100 micrometers, and a slight variation in the thickness of the air passage 105 would result in a change in the air pressure Pn near the ink discharge port 107. It has been highly difficult to manufacture the ink jet recording head while controlling the thickness of the air passage 105 to be uniform at all of the ink discharge ports 107.
  • the thickness of the adhesive layers used tends to differ from place to place, and the air passage 105 is often apt to have varying thicknesses.
  • the air pressure Pn near the ink discharge ports 107 varies due to thickness irregularities of the air passage 105.
  • the ink meniscuses are therefore not stabilized uniformly, and the responses, the amounts of discharged ink, and the threshold voltages (minimum recording voltage) are varied from discharge port to discharge port, resulting in different recording characteristics exhibited by the ink jet recording head.
  • an ink jet recording apparatus comprising: an ink tank; an ink chamber communicating with said ink tank; means defining ink discharge ports adjacent to and communicating with said ink chamber; means defining air discharge ports confronting said ink discharge ports, respectively, for discharging an air flow; means for applying an air pressure to said ink tank to form convex ink menicuses respectively at said ink discharge ports; and means responsive to an electric signal for enabling ink discharged from said ink discharge ports to be expelled with said air flow from said air discharge ports, characterised in that said ink tank has an ink level lying below said ink discharge ports.
  • FIGS. 5 and 6 illustrate an ink jet recording head which can be used in apparatus of the present invention.
  • the ink jet recording head generally designated by the reference numeral 12, includes a body 1, an air nozzle plate 2 of an insulating material attached to the outer end of an outer wall 1a of the body 1, and an ink nozzle plate 3 of an insulating material attached to the outer end of an inner wall 1b of the body 1.
  • the outer and inner walls 1a, 16 of the body 1 define therebetween an air chamber 4 communicating with an air passage 5 defined as a gap between the air nozzle plate 2 and the ink nozzle plate 3.
  • the body 1 has an ink chamber 6 defined inwardly of and by the ink nozzle plate 3 and the inner wall 16.
  • the ink nozzle plate 3 has an array of ink discharge ports 7, and the air nozzle plate 1 has an array of air discharge ports 8 in alignment with the ink discharge ports 7, respec­tively.
  • a common electrode 9 of flat configuration is mounted on the outer surface of the air nozzle plate 2 around the air discharge ports 8.
  • Separate control electrodes 10 are mounted on the inner surface of the ink nozzle plate 3 around the ink discharge ports 7.
  • the electrodes 9, 10 are connnected to signal sources 11.
  • An air supply passage 13 has an end connected to the air chamber 4, and an ink supply passage 14 has an end connected to the ink chamber 6.
  • the other end of the air supply passage 13 is coupled to an air source 22, and the other end of the ink supply passage 14 is coupled to an ink tank 21.
  • An air supply passage 18 branched from the air supply passage 13 is connected to an upper end of the ink tank 16.
  • an array of projections 15 structurally integral with the ink nozzle plate 3 is disposed in the air passage 5 between the ink discharge ports 7 and extends in a direction normal to the direction in which the ink discharge ports 7 are arrayed.
  • the projections 15 terminate short of the air nozzle plate 2 with a small clearance left between the projections 15 and the air nozzle plate 2.
  • Each of the projections 15 has an length L1 smaller than the width L2 of the air passage 5, i.e., the ink nozzle plate 3, so that the projections 15 do not completely block the air passage 5, but leave gaps alongside of the array of projections 15, i.e., between the ends of the projections 15 and the inner side surfaces of the air passage 5, for allowing air to flow through the gaps in the air passage 5.
  • the ends of the projections 15 are beveled not to disturb such an air flow through the clearances.
  • the beveled ends of the projections 15 are of an arcuate cross-­sectional shape.
  • the ends of the projections 15 terminate short of sthe inner side surfaces of the air passage 5 for the reason of minimizing the effect of any resistance-dependent pressure loss to increase the stability of ink meniscuses at the ink discharge ports 7.
  • the length L1 of each of the projections 15 has an optimum value which is smaller than the width L2 of the air passage 5 for stabilizing the ink meniscuses.
  • the length L1 and the width L2 vary with the thickness of the air passage 5, and are in the following relationship: (1/3)L2 ⁇ L1 ⁇ L2
  • the principles of operation of the ink jet recording head 12 for ejecting the ink are the same as those described with reference to FIGS. 1 through 4. Since the air passage 5 is roughly divided by the projections 15 into different sections associated with the respective ink discharge ports 7, ink flows from the ink discharge ports 7 and air flows in such air passage sections are prevented from interfering with each other, and the air pressure near the ink discharge ports 7 and the air discharge ports 8 are uniformized even if the thickness of the air passage 5 is varied. Therefore, the ink meniscuses are rendered substantially uniformly. Even when ink from any of the ink discharge ports 7 is trapped in the air passage 5, air is forced to flow independently through the air passage section communicating with that ink discharge port 7 thereby to expel the trapped ink out of the air discharge port 8. The responses, the amounts of expelled ink, and the threshold voltages for the respective ink nozzles are uniformized to provide uniform recording characteristics.
  • the height of the projections 15 are slightly smaller than the thickness of the air passage 5, providing a thin continuous gap above the array of projections 15 to allow a continuous upper air layer to flow through such a gap. While the projections 15 may be joined to the air nozzle plate 2, such a continuous gap over the array of projections 15 for a continuous air layer to flow over the array of projections 15 is more advantageous.
  • FIG. 7 shows another ink jet recording head in which ink can be used in this invention.
  • the gap defined between each projection 15 and the air nozzle plate 2 is selected to be about 1/3 through 2/3 of the distance between the air nozzle plate 2 and the ink nozzle plate 3.
  • Each projection 15 has a length (corresponding to L1 in FIG. 5) which is the same as or smaller than the width (corresponding to L2 in FIG. 5) of the ink nozzle plate 3. Therefore, the air passage 5 is substantially completely divided in the direction of the projection array into different sections communicating respectively with the air discharge ports 8 and the ink discharge ports 7.
  • the outlet end of each of the ink discharge ports 7 is surrounded by a tapered projecting mouth 17 for causing the air flow in the air passage 5 to be sharply directed into the air discharge port 8, from which the air flow is discharged.
  • the air passage 5 is substantially completely divided by the projections 15 into different sections communicating respectively with the air discharge ports 8 and the ink discharge ports 7, the speeds of air flowing from the air chamber into the air discharge ports 8 and then out of the discharge ports 8 are uniformized.
  • the projections 15 may be formed by partly etching a panel of photosensitive synthetic resin or glass when forming the ink discharge ports 7 in the ink nozzle plate 3. More specifically, the structure of FIG. 7 can be made by forming the ink nozzle plate 3 of photosensitive glass, for example, then forming the tapered projecting mouths 17 and the projections 15 in a first etching process, and finally forming the ink discharge ports 7 in a second etching process.
  • projections 15′ may be formed on the air nozzle plate 2 as shown in FIG. 8.
  • FIGS. 9 and 10 are illustrative of another recording head which can be used in this invention.
  • the ink jet recording head includes an ink nozzle plate 3 having an array of ink discharge ports 7-n spaced at a constant pitch D in the longitudinal direction of the ink nozzle plate 3, and an air nozzle plate 2 having an array of air discharge ports 8-n defined in alignment respectively with the ink discharge ports 7-n.
  • the ink nozzle plate 3 and the air nozzle plate 2 are spaced from each other to allow an air layer 19 to flow therebetween.
  • a common electrode 9 shared by the air discharge ports 8-n is mounted on the outer surface of the air nozzle plate 2 around the air discharge ports 8-n.
  • Separate electrodes 10 are mounted on the inner surface of the ink nozzle plate 3 respectively around the ink discharge ports 7-n, the electrodes 10 being disposed in an ink chamber 6 defined inwardly of the ink nozzle plate 3.
  • the pressure Pn of air in the vicinity of each of the ink discharge prots 7-n is primarily determined by:
  • the air pressure Pa is normally in the range of from 0.1 to 0.15 kg/cm2.
  • the air pressure of about 0.1 kg/cm2 or higher is required to accelerate ink drawn out of the ink discharge ports 7-n.
  • the air pressure Pa is related to the rate of flow of air in the air layer 19. The lower the air pressure Pa, the smaller the value (Pa - Pn).
  • the air pressure Pa should be set to a value required to accelerate ink, but not be varied to reduce the value (Pa - Pn).
  • the pitch D is selected to meet the way in which the multinozzle ink jet recording head is used or the purpose for which it is used.
  • the distance T affects the characteristics of the discharging of ink from the ink discharge ports 7-n. If the distance T exceeds a certain value (about 100 micrometers), then the response is sharply lowered. Therefore, it would not be a good approach to reduce the value (Pa - Pn) by increasing the distance T as it would affect the ink discharging characteristics.
  • the diameter DA and length LA of the air discharge ports are also related to the air flow rate, and subjected to limitations in order to achieve stable discharging of ink from the ink discharge ports. Specifically, the diameter DA should be about twice the diameter of the ink discharge ports or more, and the length LA should be about three times the diameter DA or less.
  • the ink tank is lowered so that the ink levels in the ink discharge port 7 and the ink tank are 19 cm apart from each other, for thereby keeping the ink pressure pi in the ink discharge port 7 and the air pressure Pn outside of the ink discharge port 7 in equilibrium.
  • Multinozzle ink jet recording heads that were made on a trial basis had 16 ink discharge ports 7-n.
  • a pulse voltage having a pulse duration of 100 microseconds each of the ink discharge ports 7-n was measured for a minimum voltage (hereinafter referred to as a threshold voltage Vth) required to discharge ink to determine ink discharging characteristics of each ink discharge port.
  • the air pressure Pn in FIG. 11 was the pressure applied to the ink chamber 6 when no air pressure was applied to the ink tank and air flows only into the ink jet recording head, and corresponds to the average of the air pressures Pn acting on the 16 ink discharge ports 7-n.
  • the value (Pa - Pn) was compensated for by the height of the ink tank.
  • the above table shows that for the head No. 1 with the width L of the ink nozzle plate being 1 mm, the threshold voltage Vth ranged from 350 to 370 V and hence was subjected to substantially no variations among the 16 ink discharge ports, whereas for the head No. 4 with the width L being 4 mm, the threshold voltage Vth ranged from 350 to 550 V and hence was subjected to a maximum variation of 200 V among the ink discharge ports.
  • the experimental result for the head No. 4 is caused from the fact that since the air layer 19 underwent an increased degree of viscous resistance, the value (Pa - Pn) increased and the air pressure Pn varied for the respective ink discharge ports 7-n, changing the ink meniscuses at the ink discharge ports 7-n.
  • FIGS. 12 and 13 illustrate an ink and air supply system of the ink jet recording apparatus according to the present invention.
  • the prior ink and air supply system shown in FIGS. 3 and 4 is disadvantageous in that when the ink meniscuses are eliminated for some reason, they often cannot be restored.
  • the ink and air supply system of FIGS. 12 and 13 is designed to solve such a problem.
  • the ink pressure Pi in the ink chamber 6 must be higher than the air pressure Pn in the vicinity of the ink discharge port 7. To this end, the air pressure Pn should be lowered.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP19900100880 1985-08-13 1986-08-13 Tintenstrahldrucker Expired - Lifetime EP0376922B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19900100880 EP0376922B1 (de) 1985-08-13 1986-08-13 Tintenstrahldrucker

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP17790785A JPS6239249A (ja) 1985-08-13 1985-08-13 インクジエツト記録ヘツド
JP177907/85 1985-08-13
JP177908/85 1985-08-13
JP17790885A JPS6239250A (ja) 1985-08-13 1985-08-13 インクジエツト記録装置
JP195126/85 1985-09-04
JP60195126A JPH064321B2 (ja) 1985-09-04 1985-09-04 インクジエツト記録装置
EP19900100880 EP0376922B1 (de) 1985-08-13 1986-08-13 Tintenstrahldrucker

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP86306259.2 Division 1986-08-13

Publications (2)

Publication Number Publication Date
EP0376922A1 true EP0376922A1 (de) 1990-07-04
EP0376922B1 EP0376922B1 (de) 1993-07-28

Family

ID=27441909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900100880 Expired - Lifetime EP0376922B1 (de) 1985-08-13 1986-08-13 Tintenstrahldrucker

Country Status (1)

Country Link
EP (1) EP0376922B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594110A2 (de) * 1992-10-20 1994-04-27 Canon Kabushiki Kaisha Farbstrahldruckkopf, dessen Herstellungsverfahren und zugehöriges Farbstrahlgerät
EP0701900A1 (de) * 1994-04-04 1996-03-20 Rohm Co., Ltd. Vorrichtung zur erkennung einer erschöpfung des tintenvorrates und tintenstrahldrucker
EP1355787A1 (de) * 2000-12-21 2003-10-29 Silverbrook Research Pty. Limited Düsenflutungsisolierung für tintenstrahldruckkopf

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1483571A (en) * 1974-09-26 1977-08-24 Matsushita Electric Ind Co Ltd Apparatus for applying liquid droplets to a surface by using a high speed laminar air flow to accelerate the same
DE3001773A1 (de) * 1979-01-19 1980-08-07 Matsushita Electric Ind Co Ltd Fluessigkeitsstrahlschreiber
DE3203014A1 (de) * 1981-02-04 1982-08-12 Sanyo Denki K.K., Moriguchi, Osaka Tintenstrahldrucker und tintentropfenausstossvorrichtung sowie verfahren zur verhinderung ihres verstopfens durch tinte
EP0061327A2 (de) * 1981-03-19 1982-09-29 Matsushita Electric Industrial Co., Ltd. Farbstrahlschreibkopf mit mehreren Düsen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1483571A (en) * 1974-09-26 1977-08-24 Matsushita Electric Ind Co Ltd Apparatus for applying liquid droplets to a surface by using a high speed laminar air flow to accelerate the same
DE3001773A1 (de) * 1979-01-19 1980-08-07 Matsushita Electric Ind Co Ltd Fluessigkeitsstrahlschreiber
DE3203014A1 (de) * 1981-02-04 1982-08-12 Sanyo Denki K.K., Moriguchi, Osaka Tintenstrahldrucker und tintentropfenausstossvorrichtung sowie verfahren zur verhinderung ihres verstopfens durch tinte
EP0061327A2 (de) * 1981-03-19 1982-09-29 Matsushita Electric Industrial Co., Ltd. Farbstrahlschreibkopf mit mehreren Düsen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594110A2 (de) * 1992-10-20 1994-04-27 Canon Kabushiki Kaisha Farbstrahldruckkopf, dessen Herstellungsverfahren und zugehöriges Farbstrahlgerät
EP0594110A3 (en) * 1992-10-20 1995-10-25 Canon Kk Ink jet head, method of producing the ink jet head and ink jet apparatus operable using the ink jet head
US5682190A (en) * 1992-10-20 1997-10-28 Canon Kabushiki Kaisha Ink jet head and apparatus having an air chamber for improving performance
EP0701900A1 (de) * 1994-04-04 1996-03-20 Rohm Co., Ltd. Vorrichtung zur erkennung einer erschöpfung des tintenvorrates und tintenstrahldrucker
EP0701900A4 (de) * 1994-04-04 1996-08-14 Rohm Co Ltd Vorrichtung zur erkennung einer erschöpfung des tintenvorrates und tintenstrahldrucker
US5724076A (en) * 1994-04-04 1998-03-03 Rohm Co., Ltd. Out-of-ink detector and ink jet printer
EP1355787A1 (de) * 2000-12-21 2003-10-29 Silverbrook Research Pty. Limited Düsenflutungsisolierung für tintenstrahldruckkopf
EP1355787A4 (de) * 2000-12-21 2005-04-06 Silverbrook Res Pty Ltd Düsenflutungsisolierung für tintenstrahldruckkopf

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