US3852768A - Charge detection for ink jet printers - Google Patents

Charge detection for ink jet printers Download PDF

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Publication number
US3852768A
US3852768A US00389291A US38929173A US3852768A US 3852768 A US3852768 A US 3852768A US 00389291 A US00389291 A US 00389291A US 38929173 A US38929173 A US 38929173A US 3852768 A US3852768 A US 3852768A
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US
United States
Prior art keywords
sensor
drops
charges
sensor means
ink
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
US00389291A
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English (en)
Inventor
R Williams
J Carmichael
D West
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IBM Information Products Corp
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International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00389291A priority Critical patent/US3852768A/en
Priority to IT23411/74A priority patent/IT1012999B/it
Priority to FR7424580*A priority patent/FR2240822B1/fr
Priority to DE2434759A priority patent/DE2434759C2/de
Priority to JP49087572A priority patent/JPS5247285B2/ja
Priority to CA206,390A priority patent/CA1010491A/en
Priority to GB3447574A priority patent/GB1434522A/en
Application granted granted Critical
Publication of US3852768A publication Critical patent/US3852768A/en
Assigned to MORGAN BANK reassignment MORGAN BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IBM INFORMATION PRODUCTS CORPORATION
Assigned to IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD AVENUE, GREENWICH, CT 06830 A CORP OF DE reassignment IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD AVENUE, GREENWICH, CT 06830 A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL BUSINESS MACHINES CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/24—Arrangements for measuring quantities of charge
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R5/00—Instruments for converting a single current or a single voltage into a mechanical displacement
    • G01R5/28—Electrostatic instruments

Definitions

  • SUMMARY sensor is also coupled to a detection circuit for developing signals from drops passing through the sensor.
  • a prime object of the present'invention is to provide improved sensor arrangements for ink jet printers, the
  • FIG. 1 illustrates a detection circuit incorporating a sensor. the sensor being shown in greater detail in FIGS. 2 and 3.
  • FIG. 4 illustrates a variation further comprising a probe sensor having an external shield that is grounded.
  • FIG. Si is another variation using a planar sensor.
  • DESCRIPTION Non-contact sensing of the charge on an ink'stream provides for fast charge synchronization in an ink jet printer when sensitive sensors and detection circuits are provided as shown in FIGS. 1 and 4.
  • the circuit shown in FIG. 1 permits the use of a noncontact sensor shown in more detail in FIGS. 2 and 3 to sense the charge on afew drops or a single drop of ink.
  • An ink stream [comprising a plurality of drops proceeds from left to right originating from a nozzle. such as that shown in the Woods, et al applicationf'The stream passes througha charge electrode 2 that places a variable charge on each drop of ink in accordance with' data signals, and the like.
  • sensor 3 comprising a center conductor and an inner-shield 3b, togetherwith an outer shield 3;-
  • A'Field Effect Transistor (FET) operational amplifier 10 connected as shown in FIGS. 1 and 4 to the center conductor 32 and the inner shield 31; of
  • a large value resistor.l6 is connected as shown in FIGS. 1 and 4 to supply bias current to the FEToperational amplifier. This results in the ability to senseone drop of charged ink with a charge per drop less than 3 lO-l4 coulombs and with a frequency of less than 2500 samples/second.
  • the output of amplifier 10 is AC coupled to another amplifier circuit l1 and thereafter to'a threshold circuit 12 with a signal ultimately provided on line 13. Such signal may be incorporated in various circuits to control synchronization in the system as discussed in the Woods, et al application.
  • the center conductor 3a and the inner shield 3b are protected by an outer (guard) shield 3c connected to ground to reduce the noise pickup of the sensor.
  • the threshold circuit is time strobed on line 15 to reduce the effects of any noise pickup. This strobing time isolates the main noise source which is the charge electrode, and the charge-sensor sense time, during which the charged drops are passing the sensor.
  • FIG. 3 More details of the laminated sensor are shown in FIG. 3 wherein the layers of the sensor comprise alternate sheets of copper and Mylar* *Registered Trademark of Dupont).
  • the configuration in FIG. 4 comprises a cylindrical member 3 with cylindrical elements 3a, 3b, and 3c serving functions similar to those previously described.
  • This configuration is characterized as a probe-type sensor, rather than a laminar sensor.
  • the circuit in FIG. 1 and sensor configurations of FIGS. 2 and 3 or FIG. 4 can be used to detect the charge placed upon a drop of ink, thereby indicating when the charging time of the charge electrode is synchronized with the ink drop formation.
  • FIGS. 50 and 5b represents a probe-type sensor 3 constructed on one plane, rather than as a cylinder like the sensor in FIG. 4. However, similar elements are similarly referenced. Additional applications: i
  • Velocity By placing two sensors along the stream of ink some distance apart,,then measuring-the time it takes a drop of charged ink to move the known distance, a velocity can be observed (v distance/time). A package or a single drop of charged drops can also be used'but with somewhat less resolution;
  • a sensor system for ink jet printers particularly providing reduced noise and'improved signal to noise ratio, comprising:
  • nozzle means for forming and propelling a stream of ink jet drops, charging means for charging said ink drops, deflecting means for deflecting said ink drops in accordance with the charge on said drops in a predetermined path toward a document to be printed, or the like; sensor means positioned downstream from said nozzle means in the path of travel of said ink drops,
  • said sensor means comprising an assembly of laminar elements including a sensor element, an inner shield, and an outer shield, and said sensor means having an aperture through which said ink drops pass, the arrangement being such that drops passing through said aperture are capacitively coupled to said sensor means for generating charges thereon in timed relation to passage of drops through the aperture of said sensor means; means interconnected with said outer shield for electrically grounding said outer shield to thereby reduce noise pickup by said sensor means; anda circuit interconnected with said sensor element and said inner shield for developing signals representative of detected charges.
  • said sensor means comprises:
  • said sensor means comprises:
  • a cylindrical structure composed of concentrically mounted elements comprising a central concentric metallic sensor element, an inner shield surrounding said sensor element, an outer shield surrounding said inner shield, insulation interposed between said shields, and an aperture formed through the center of said sensor element in said cylindrical structure.
  • strobe means incorporated in said circuit means for time strobing charges induced in said sensor means in order to further minimize effects of noise induced in said sensor means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Fax Reproducing Arrangements (AREA)
US00389291A 1973-08-17 1973-08-17 Charge detection for ink jet printers Expired - Lifetime US3852768A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00389291A US3852768A (en) 1973-08-17 1973-08-17 Charge detection for ink jet printers
IT23411/74A IT1012999B (it) 1973-08-17 1974-05-31 Circuito per rivelare la carica portata da goccioline in stampa trici a getto di inchiostro
FR7424580*A FR2240822B1 (ja) 1973-08-17 1974-06-28
DE2434759A DE2434759C2 (de) 1973-08-17 1974-07-19 Einrichtung zum Abfühlen der Aufladung von Tintentropfen
JP49087572A JPS5247285B2 (ja) 1973-08-17 1974-08-01
CA206,390A CA1010491A (en) 1973-08-17 1974-08-06 Charge detection for ink jet printers
GB3447574A GB1434522A (en) 1973-08-17 1974-08-06 Ink jet printers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00389291A US3852768A (en) 1973-08-17 1973-08-17 Charge detection for ink jet printers

Publications (1)

Publication Number Publication Date
US3852768A true US3852768A (en) 1974-12-03

Family

ID=23537651

Family Applications (1)

Application Number Title Priority Date Filing Date
US00389291A Expired - Lifetime US3852768A (en) 1973-08-17 1973-08-17 Charge detection for ink jet printers

Country Status (7)

Country Link
US (1) US3852768A (ja)
JP (1) JPS5247285B2 (ja)
CA (1) CA1010491A (ja)
DE (1) DE2434759C2 (ja)
FR (1) FR2240822B1 (ja)
GB (1) GB1434522A (ja)
IT (1) IT1012999B (ja)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907429A (en) * 1974-08-08 1975-09-23 Ibm Method and device for detecting the velocity of droplets formed from a liquid stream
US3911445A (en) * 1974-09-25 1975-10-07 Dick Co Ab Ink drop stream integrity checker in an ink jet printer
US3977010A (en) * 1975-12-22 1976-08-24 International Business Machines Corporation Dual sensor for multi-nozzle ink jet
US3992713A (en) * 1975-06-20 1976-11-16 International Business Machines Corporation Ink jet printing system with pedestal synchronization
US4032924A (en) * 1974-10-31 1977-06-28 Nippon Telegraph And Telephone Public Corporation Distortion reduction in ink jet system printer
US4067019A (en) * 1976-06-14 1978-01-03 International Business Machines Corporation Impact position transducer for ink jet
US4121223A (en) * 1975-09-19 1978-10-17 Hitachi, Ltd. Ink jet recording apparatus with an improved ink sensor
US4150384A (en) * 1977-10-17 1979-04-17 International Business Machines Corporation Method and apparatus for synchronizing charging of droplets of a pressurized conductive liquid stream
FR2413980A1 (fr) * 1978-01-09 1979-08-03 Ibm Dispositif de mise hors service d'elements defectueux dans une imprimante a jet d'encre
DE2905062A1 (de) 1979-02-10 1980-08-14 Olympia Werke Ag Verfahren, einrichtung und detektoren zum ueberwachen der geschwindigkeit von tintentropfen
US4323908A (en) * 1980-08-01 1982-04-06 International Business Machines Corp. Resonant purging of drop-on-demand ink jet print heads
US4333083A (en) * 1980-12-23 1982-06-01 International Business Machines Corporation Electrostatic drop sensor with sensor diagnostics for ink jet printers
EP0070054A1 (en) * 1981-07-10 1983-01-19 Agfa-Gevaert N.V. Method and apparatus of assessing the dynamic surface potential of a solution
US4417256A (en) * 1980-05-09 1983-11-22 International Business Machines Corporation Break-off uniformity maintenance
FR2545041A1 (fr) * 1983-04-29 1984-11-02 Imaje Sa Dispositif de controle de charge des gouttes et tete d'imprimante a projection d'encre qui en est equipee
EP0124465A1 (fr) * 1983-04-29 1984-11-07 Imaje S.A. Dispositif de contrÔle de charge, et son application au contrÔle de la vitesse des gouttes d'encre d'une imprimante à jet d'encre.
EP0149739A2 (de) * 1984-01-20 1985-07-31 Codi-Jet Markierungs Systeme GmbH Verfahren und Anordnung für das Tintenzuführsystem eines Tintenstrahldruckers
US4688047A (en) * 1986-08-21 1987-08-18 Eastman Kodak Company Method and apparatus for sensing satellite ink drop charge and adjusting ink pressure
US4760342A (en) * 1985-02-19 1988-07-26 U.S. Philips Corp. Electrostatic induction probe arrangement using several probes
US5160939A (en) * 1988-09-29 1992-11-03 Imaje S.A. Device for controlling and regulating an ink and processing thereof in a continuous ink jet printer
US6626513B2 (en) 2001-07-18 2003-09-30 Lexmark International, Inc. Ink detection circuit and sensor for an ink jet printer
US6631971B2 (en) 2001-07-18 2003-10-14 Lexmark International, Inc. Inkjet printer and method for use thereof
WO2003099568A1 (fr) * 2002-05-27 2003-12-04 Viktor Ivanovich Bezrukov Systeme hydraulique d'une imprimante a jet d'encre electrique et elements dudit systeme
US6764168B1 (en) * 2002-03-01 2004-07-20 Novellus Systems, Inc. Sensor for detecting droplet characteristics
GB2400347A (en) * 2003-04-09 2004-10-13 Hewlett Packard Development Co Print head charge shield
US20060164094A1 (en) * 2003-09-05 2006-07-27 Golder Roger F Particle detection
US7091134B1 (en) 2003-06-17 2006-08-15 Novellus Systems, Inc. Deposition of integrated circuit fabrication materials using a print head
US10207505B1 (en) 2018-01-08 2019-02-19 Eastman Kodak Company Method for fabricating a charging device
CN110220421A (zh) * 2019-07-22 2019-09-10 太原引卓科技有限责任公司 一种同时测量破片速度、位置和数量的方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2744785B2 (de) * 1977-10-05 1981-05-21 Robert 7995 Neukirch Buck Elektronischer Annäherungsschalter
JPS55126915A (en) * 1979-03-22 1980-10-01 Kitani Denki Kk Device for cutting and charging electrec wire
JPS5648966U (ja) * 1979-09-21 1981-04-30
JPS58175669A (ja) * 1982-04-08 1983-10-14 Konishiroku Photo Ind Co Ltd インクジエツト記録装置における噴射ミス検知装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769632A (en) * 1972-12-11 1973-10-30 Ibm Digital phase control for an ink jet recording system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769632A (en) * 1972-12-11 1973-10-30 Ibm Digital phase control for an ink jet recording system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Naylor et al.; Differential Synchronization Sensor; IBM Tec. Disc. Bulletin, Vol. 16, No. 3, August 1973, pp. 776 777. *
Ruddy, G. A.; Position And Synchronization Sensor For An INR Jet Printer; IBM Tec. Disc. Bulletin, Vol. 15, No. 9, February 1973, pp. 2785 2786. *

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907429A (en) * 1974-08-08 1975-09-23 Ibm Method and device for detecting the velocity of droplets formed from a liquid stream
US3911445A (en) * 1974-09-25 1975-10-07 Dick Co Ab Ink drop stream integrity checker in an ink jet printer
US4032924A (en) * 1974-10-31 1977-06-28 Nippon Telegraph And Telephone Public Corporation Distortion reduction in ink jet system printer
US3992713A (en) * 1975-06-20 1976-11-16 International Business Machines Corporation Ink jet printing system with pedestal synchronization
US4121223A (en) * 1975-09-19 1978-10-17 Hitachi, Ltd. Ink jet recording apparatus with an improved ink sensor
US3977010A (en) * 1975-12-22 1976-08-24 International Business Machines Corporation Dual sensor for multi-nozzle ink jet
US4067019A (en) * 1976-06-14 1978-01-03 International Business Machines Corporation Impact position transducer for ink jet
US4150384A (en) * 1977-10-17 1979-04-17 International Business Machines Corporation Method and apparatus for synchronizing charging of droplets of a pressurized conductive liquid stream
FR2413980A1 (fr) * 1978-01-09 1979-08-03 Ibm Dispositif de mise hors service d'elements defectueux dans une imprimante a jet d'encre
US4171527A (en) * 1978-01-09 1979-10-16 International Business Machines Corporation Ink jet contamination detecting system
DE2905062A1 (de) 1979-02-10 1980-08-14 Olympia Werke Ag Verfahren, einrichtung und detektoren zum ueberwachen der geschwindigkeit von tintentropfen
US4417256A (en) * 1980-05-09 1983-11-22 International Business Machines Corporation Break-off uniformity maintenance
US4323908A (en) * 1980-08-01 1982-04-06 International Business Machines Corp. Resonant purging of drop-on-demand ink jet print heads
US4333083A (en) * 1980-12-23 1982-06-01 International Business Machines Corporation Electrostatic drop sensor with sensor diagnostics for ink jet printers
EP0070054A1 (en) * 1981-07-10 1983-01-19 Agfa-Gevaert N.V. Method and apparatus of assessing the dynamic surface potential of a solution
FR2545041A1 (fr) * 1983-04-29 1984-11-02 Imaje Sa Dispositif de controle de charge des gouttes et tete d'imprimante a projection d'encre qui en est equipee
EP0124465A1 (fr) * 1983-04-29 1984-11-07 Imaje S.A. Dispositif de contrÔle de charge, et son application au contrÔle de la vitesse des gouttes d'encre d'une imprimante à jet d'encre.
US4590483A (en) * 1983-04-29 1986-05-20 Imaje S.A. Ink jet printer with charging control of ink-drop flow velocity
EP0149739A3 (en) * 1984-01-20 1985-08-21 Contraves Gmbh Method and apparatus for the ink supply in an ink jet printer
EP0149739A2 (de) * 1984-01-20 1985-07-31 Codi-Jet Markierungs Systeme GmbH Verfahren und Anordnung für das Tintenzuführsystem eines Tintenstrahldruckers
US4612553A (en) * 1984-01-20 1986-09-16 Contraves Gmbh Method for operational status checks of an ink jet printer
US4760342A (en) * 1985-02-19 1988-07-26 U.S. Philips Corp. Electrostatic induction probe arrangement using several probes
US4688047A (en) * 1986-08-21 1987-08-18 Eastman Kodak Company Method and apparatus for sensing satellite ink drop charge and adjusting ink pressure
US5160939A (en) * 1988-09-29 1992-11-03 Imaje S.A. Device for controlling and regulating an ink and processing thereof in a continuous ink jet printer
US6626513B2 (en) 2001-07-18 2003-09-30 Lexmark International, Inc. Ink detection circuit and sensor for an ink jet printer
US6631971B2 (en) 2001-07-18 2003-10-14 Lexmark International, Inc. Inkjet printer and method for use thereof
US6764168B1 (en) * 2002-03-01 2004-07-20 Novellus Systems, Inc. Sensor for detecting droplet characteristics
WO2003099568A1 (fr) * 2002-05-27 2003-12-04 Viktor Ivanovich Bezrukov Systeme hydraulique d'une imprimante a jet d'encre electrique et elements dudit systeme
US20040201640A1 (en) * 2003-04-09 2004-10-14 Sam Sarmast Print head charge shield
GB2400347A (en) * 2003-04-09 2004-10-13 Hewlett Packard Development Co Print head charge shield
US6951379B2 (en) 2003-04-09 2005-10-04 Hewlett-Packard Development Company, L.P. Print head charge shield
GB2400347B (en) * 2003-04-09 2006-02-08 Hewlett Packard Development Co Print head charge shield
US7091134B1 (en) 2003-06-17 2006-08-15 Novellus Systems, Inc. Deposition of integrated circuit fabrication materials using a print head
US20060164094A1 (en) * 2003-09-05 2006-07-27 Golder Roger F Particle detection
US7298127B2 (en) * 2003-09-05 2007-11-20 Smiths Detection - Waterford Limited Particle detection
US20100283450A1 (en) * 2003-09-05 2010-11-11 Smiths Detection - Watford Limited Particle detection
US10207505B1 (en) 2018-01-08 2019-02-19 Eastman Kodak Company Method for fabricating a charging device
CN110220421A (zh) * 2019-07-22 2019-09-10 太原引卓科技有限责任公司 一种同时测量破片速度、位置和数量的方法
CN110220421B (zh) * 2019-07-22 2021-07-02 太原引卓科技有限责任公司 一种同时测量破片速度、位置和数量的方法

Also Published As

Publication number Publication date
FR2240822A1 (ja) 1975-03-14
DE2434759C2 (de) 1983-12-29
CA1010491A (en) 1977-05-17
JPS5247285B2 (ja) 1977-12-01
FR2240822B1 (ja) 1976-10-22
DE2434759A1 (de) 1975-02-27
JPS5051227A (ja) 1975-05-08
IT1012999B (it) 1977-03-10
GB1434522A (en) 1976-05-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MORGAN BANK

Free format text: SECURITY INTEREST;ASSIGNOR:IBM INFORMATION PRODUCTS CORPORATION;REEL/FRAME:005678/0062

Effective date: 19910327

Owner name: IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL BUSINESS MACHINES CORPORATION;REEL/FRAME:005678/0098

Effective date: 19910326