US3836912A - Drop charge sensing apparatus for an ink jet printing system - Google Patents

Drop charge sensing apparatus for an ink jet printing system Download PDF

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Publication number
US3836912A
US3836912A US00313913A US31391372A US3836912A US 3836912 A US3836912 A US 3836912A US 00313913 A US00313913 A US 00313913A US 31391372 A US31391372 A US 31391372A US 3836912 A US3836912 A US 3836912A
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United States
Prior art keywords
droplets
ink
charge
stream
nozzle
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Expired - Lifetime
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US00313913A
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English (en)
Inventor
J Ghougasian
J Hart
H Juliusburger
P Lowy
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.)
International Business Machines Corp
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International Business Machines Corp
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Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00313913A priority Critical patent/US3836912A/en
Priority to DE2348724A priority patent/DE2348724C3/de
Priority to AR250453A priority patent/AR203730A1/es
Priority to FR7338181A priority patent/FR2210143A5/fr
Priority to IT30502/73A priority patent/IT998915B/it
Priority to GB4951273A priority patent/GB1417919A/en
Priority to BE137263A priority patent/BE806746A/xx
Priority to AU62057/73A priority patent/AU473694B2/en
Priority to JP48126855A priority patent/JPS5834301B2/ja
Priority to SE7315534A priority patent/SE392650B/xx
Priority to CA185,962A priority patent/CA1007282A/en
Priority to NO4576/73A priority patent/NO140692C/no
Priority to FI3706/73A priority patent/FI59885C/fi
Priority to NL7316833A priority patent/NL7316833A/xx
Priority to BR9674/73A priority patent/BR7309674D0/pt
Priority to DK668673A priority patent/DK143670C/da
Priority to MX000993U priority patent/MX3023E/es
Application granted granted Critical
Publication of US3836912A publication Critical patent/US3836912A/en
Priority to JP54119443A priority patent/JPS6039553B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B41J2/115—Ink jet characterised by jet control synchronising the droplet separation and charging time

Definitions

  • An inductive charge sensing device is disclosed in accordance with the teachings of the present invention for use with an ink jet printing system wherein ink under pressure is applied to a nozzle and ink emitted by the nozzle thereafter breaks up into a series of drops which are electrostatically charged and subsequently deflected in order to achieve controlled printing upon a recording surface moved in front of said apparatus.
  • the charging and deflection of individual droplets is effected under control of an applied video signal. In order for the proper information to be recorded, the charging and deflection operation must be performed in precise synchronization with the ink droplet formation.
  • the charge sensor detects charges impressed on said droplets passing adjacent to but in nonimpinging relationship with said sensor and a signal is developed which may be used to control an electrical or electromechanical drop forming means associated with said nozzle and ink supply.
  • VIDEO SIGNAL SOURCE I HIAZ AMP VIDEO SIGNAL SOURCE I HIAZ AMP.
  • FIG. 6B SEPARATION TIMEH CHARGING SIGNAL 1 (OUT OF PHASE WITH l SEPARATIONTTIME)
  • FIG. 6B SEPARATION TIMEH CHARGING SIGNAL 1 (OUT OF PHASE WITH l SEPARATIONTTIME)
  • the present application is related to U.S. Patent application Ser. No. 3l3,9l'4 filed concurrently with the present application of H. Juliusburger et al. entitled Digital Ink Jet Pulse Edge Phase Control System (now U.S. Patent No. 3,769,632).
  • This referenced patent discloses a particular phase control system which utilizes the inductive proximity drop charge sensor of the present invention in a specific synchronization control system. As such it represents a preferred utilization of the device of the present
  • the ink is caused to break up into individual droplets.
  • the droplet formation is controlled by a number of different methods available in the art including physical vibration of the nozzle, pressureperturbations introduced into the ink supply feed to the nozzle, etc.
  • the result of applying such external perturbations to the inkjet apparatus is to cause the jet stream emerging from the nozzle to break up into uniform drops at a predetermined frequency and at a somewhat variable distancefrom the tip of the nozzle. It is necessary, however, that this droplet formation and the application of video charging signals to the ink dropletstream be synchronized.
  • the rate of drop formation in such systems is determined by a signal applied to the physical perturbation means. e.g., vibrating the nozzle.
  • a means for applying an electrostatic charge to each drop produced by the nozzle is provided in such systems adjacent to the location where the ink stream begins to form such droplets.
  • this means is a hollow tube. channel, plates, etc. surrounding the emerging stream and connected to a suitable charging source.
  • Video signals are applied between the nozzle and the charging electrode in response to which a drop will assume a charge determined by the amplitude ofthe particular video signal onthe charging electrode at the time that the drop breaks away from the jet stream.
  • the drop thereafter passes through a fixed electric field and the amount of deflection is determined by the amplitude of the charge on the drop at the time it passes through said deflecting field.
  • a suitable recording surface is positioned downstream from the deflecting means with the result that the droplet strikes such recording surface and forms a small spot.
  • the position of the drop on the writing surface is determined by the deflection the drop experiences which in turn is determined by the charge on the droplet.
  • the location at which the droplet strikes the recording surface may be controlled with the result that by applying suitable video signals to such a system, a visible human readable printed record may be formed upon the recording surface.
  • U.S. Pat. No. 3,596,275 of Richard G. Sweet entitled Fluid Droplet Recorder discloses-such a recording or printing system.
  • the time that the drop separates from the fluid stream emerging from the nozzle is .quite critical since the charge carried by the droplet is normally produced by electrostatic induction.
  • the field established by the video signal is maintained while the drop separates.
  • the drop will carry a charge determined by'this video signal and proportional to the magnitude thereof.
  • lt is accordingly a primary object of the present invention to provide an improved element for detecting ink drop separation times for use in an ink jet recording system.
  • lt is a further object to provide such an element utilizing a charge carried by individual droplets to detect such separation times.
  • FIG. 1 comprises a combination functional block diagram and a simplified perspective organizational view illustrating the principle mechanical and electrical components of an ink jetrecording system utilizing the inductive drop charge sensing element of the present invention.
  • FlG. 1B comprises a series of curves illustrating certain of the critical time relationships in the system of FIG. 1A.
  • FIG. 2 comprises a set of curves illustrating a preferred method of charging ink drops during a test phase portion of the system operation cycle.
  • FIG. 3 comprises a set of curves illustrating a different embodiment for applying a test signal to various ink droplets during the test phase portion of an operating cycle.
  • FlGS. 4A and 4B illustrate the location ofa given ink droplet with respect to the sensing element tip at times f and [2.
  • FIG. 5 is a graphical illustration of the charge produced in the sensing element as a result of a charged drop passing said element.
  • FIGS. 6A-6D are curves representing the series of individual induced charges in the sensing element and the cumulative charge effect induced in said element.
  • FIG. 7 is a graph illustrating the currents which would be induced in the sensing circuitry as a result of the induced charge illustrated in FIG. 6D.
  • HO. 8 is a perspective view of a preferred embodiment of the present invention comprising a matrix of sensing elements and illustrating the application of the invention to monitor the synchronizing ofa plurality of individual ink jet streams.
  • FIG. 9 comprises a fragmentary cross-sectional view of FIG. 8 illustrating a single detecting element of the type shown and also the nozzle, charging apparatus, and deflection means as they would be located in such a system.
  • the objects of the present invention are accomplished in general by a sensing element for use in an ink jet printing system wherein individual ink droplets are electrostatically charged and subsequently deflected electrostatically.
  • the element comprises a conductive member placed downstream from the charging station proximate to, but in non-impinging relationship with the droplet stream.
  • a pair of shielding plates are located on each side of said sensing element substantially perpendicular to said ink stream and each plate has a small hole therein adapted to allow the ink droplet stream to pass therethrough.
  • the sensor is connected to a suitable current amplifier which develops a pulse output in accordance with the inductive charges detected by the element.
  • a test cycle is utilized wherein a special test charge is placed on the ink droplets and a plurality of successive droplets are utilized to cumulatively build-up a charge in the sensing element which greatly improves the signal-tonoise ratio and thus the accuracy of the element.
  • FIG. [A a more or less typical ink jet recording system utilizing electrostatic deflection of the ink droplets is shown with the inductive sensing element of the present invention in place between the charging station and the deflecting station.
  • the mechanical portion of the system comprises a reservoir 10 in which the ink is stored under pressure from whence it flows through the conduit 12 to a nozzle 14.
  • the ink jet stream 16 emanates under pressure from the nozzle 14 and subsequently forms droplets 18.
  • the details of the formation of the droplets from the stream are shown more clearly in FIG. 9, it being noted that the droplet formation is not immediate but occurs at some point downstream from the nozzle and within the charging station 20.
  • the droplet passes through shielding plates 24 having appropriate holes therein and pass in close proximity to the drop charge sensor 22 which in the disclosed embodiment comprises an elongated metal rod.
  • the details of the placing ofthe rod with respect to the droplet stream are shown more clearly in figures which will be described subsequently.
  • the droplets then reach the deflection plates 24 wherein the deflection of individual droplets is a result of the charge on each droplet together with the magnitude of the charge on the deflection plates.
  • the deflecting field is maintained constant and the charge upon individual droplets is varied.
  • the present sensor would work equally well with a system wherein the charge was fixed and a variable field was placed on the plates.
  • the ink droplets impinge upon the recording surface 28 subsequent to passing through the deflecting field, their particular location being determined by the video signal applied to the charging element 20.
  • a drop producing transducer is shown attached to the nozzle 14.
  • this transducer is apiezoelectric crystal which mechanically vibrates the nozzle to form the subsequent droplets 18.
  • the frequency of the vibration of the crystal determines the rate of the droplet formation.
  • the phase of. the vibration of the crystal will determine the exact time, especially with respect to the video signal source, at which droplets are produced.
  • the time of droplet formation is not in correct synchronization with the applied signals from the video signal source 32 given droplets will either not be charged at all or have an incorrect charge thereon which will result in very poor print quality.
  • a source of synch signals at 34 is utilized to drive both the transducer 30 and act as the basic timing source for the video signal source 32.
  • This source would normally be a conventional high stability oscillator producing the desired frequency for drop formation.
  • the synch signals going to the video signal source 32 pass through a phase changing network 36 wherein a phase change may beintroduced in accordance with the signal received from the amplifier 38 connected to the detecting element 22.
  • a phase change may be introduced into the network 36 to correct this situation as will be understood.
  • curve A represents the-signal applied to the drop producing transducer 30.
  • Curve B illustrates the charging signal placed on the charging element 20 by the video signal source 32 substantially in phase with the drop separation
  • curve C illustrates the charging signal source being applied completely subsequent to drop separation.
  • FIGS. 2 and 3 represent two possible ways of applying test signals to the droplets.
  • curves A represent the transducer signal with the arrow indicating the moment of drop separation and curves B indicate the signal applied to the charging plates.
  • the test signal comprises a series of short duration pulses successively displaced across the transducer signal period.
  • the FIG. 2 cycle requires a series of test pulses applied to a predetermined number of ink droplets with each series being slightly displaced.
  • the phase changing network 36 may be controlled to, in effect, center the charging video signal appropriately around the detected separation point.
  • the gutter 27 a way is provided to intercept the charged, or partially charged test drops, so they do not interfere withthe recording operation. If requried, the test drops would be charged opposite to those used for normal recording.
  • FIG. 3 an analog system is disclosed wherein a ramp signal is applied to a successive series of droplets during the test phase and depending upon the magnitude of the charge detected, the timing of the ink droplet separation is readily resolvable with respect to the phase of the transducer signal.
  • the drop separation occurs fairly low down on the ramp; however, if the drop were found to be separating later in phase a larger ramp or charging signal would be placed on the droplets with an attendant larger charge detected by the sensor. A corrective signal would then be fed into the phase changing network as described with respect to .the embodiment of FIG. 2.
  • FIGS. 4A and 4B merely indicate the location of an individual ink droplet with respect to time at the time periods I, and t
  • FIGS. 4A and 48 merely indicate the location of an individual ink droplet with respect to time at the time periods I, and t
  • time 1 the maximum induced charge developed when the ink droplet reached the leading edge of the sensor so that its full charging effect is felt therein.
  • time I which is the beginning of the plateau region.
  • This maximum charge effect is felt until time after which time the charge starts to fall off as the drop leaves the area of the sensor.
  • a charge slowly builds up as the droplet approaches the sensor element.
  • FIGS. 6A-6D illustrate the manner in which a series of droplets utilized during a test phase can be utilized to maximize the total induced charge (1,, shown in FIG. 6D. to increase the sensitivity or signal-to-noise ratio of the system.
  • the successive curves 6A, 6B and 6C merely duplicate curve and are shown to illustrate the charging effect of a successive series of drops passing the sensing element.
  • FIG. 6B shows the total charge built-up in the sensing element during a sequence of detected charged droplets.
  • the signal or charge built-up in the sensing element and thus in the sensing element detection circuit which would preferably be an amplifier having a very high input impedance is essentially the wave form shown in FIG. 6D.
  • this charging signal wave form will produce a signal current in the input circuit of the amplifier as exemplified by the curve of FIG. 7.
  • the signal appearing at times I; or t may be utilized for controlling the phase changing network.
  • FIGS. 4A and 4B is a single elongated rodlike element constructed of a highly conductive material such as copper or possibly aluminum.
  • the inductive charge sensor could have other shapes such as a plate, ring-shaped member, or U-channel surrounding the path of the ink jet and suitably connected to the detection circuitry.
  • the shielding plates could be any thin metal such as aluminum, brass, copper, etc.
  • the opening should be large enough so that there is no possibility of interfering with the passage of the ink droplets therethrough.
  • the thickness and spacing of the plates is not overly critical.
  • the plates may be spaced [/16 of an inch on either side of the sensing element.
  • FIGS. 8 and 9 there is shown an embodiment of the present invention particularly adapted for use with an array ofindividual ink jet printing nozzles as would be used in a matrix type printing operation as is well known in the art.
  • a separate sensing element is provided for each ink jet stream making up the matrix.
  • FIG. 8 only the sensing element is shown as the overall configuration would be similar to that of FIG. IA; however, obviously there would be a multiplicity of nozzles, electronics, etc.
  • each ink stream subsequently passes to its own set of deflection plates which for the case of most matrix type printing systems will either cause the individual ink droplets to strike a gutter or some other shield or allow them to pass through and form a dot at a predetermined location on the recording surface.
  • an amplifier 48 is connected to each of the sensing elements 22 through an appropriate impedance element such as the resistance 50.
  • the sensing element may be connected to the input of a current to voltage amplifier such as described in the book Operational Amplifiers, Design and Application, Toby, Graemp, and Huelsman, McGraw Hill, New York, 1971.
  • the output of each amplifier, as described previously, is fed to an associated phase shifting or control network for controlling the phase of the charging signal for the associated nozzle and charging electrode.
  • FIG. 9 illustrates the nozzle, the ink stream breaking up into droplets, the charging plate, the sensing station including the sensing element and finally the deflection plates.
  • FIG. 9 clearly shows the droplets forming within the area of the charging electrode 20.
  • the charging electrode is fairly standard and the point of droplet fomation is relatively constant since the primary system physical variables are in viscosity, temperature, and the like.
  • variable which causes the problem which is solved by the present invention is synchronizing the precise drop break-off time with the application of the charging signal to the charging electrode.
  • the droplet will either receive no charge or a very slight charge due to the effects of the preceding charging signal.
  • the shape and location of the sensing element 22 together with the shielding plates 42 having apertures 44 therein, is clearly shown in FIG. 9.
  • the element must be placed sufficiently close to the stream of ink droplets to be able to sensitively detect charges thereon and yet be spaced far enough away that there is no reasonable likelihood of the ink droplet impinging upon the sensing element.
  • the magnitude of the signal is not materially affected by the width of the sensor, since only approaching and departing charged drops contribute to the sensor output.
  • sensors between about 5 and 20 times the ink drop diameter have been used for ease of alignment.
  • the spacing of a droplet from the stream should be between about 5 and 10 times the diameter of a droplet.
  • Typical values of voltage developed across the 10 megohms resistor 50 are 50-l50 mV for 16 drops at I00 KHz and for dimensions as shown above.
  • test signal of increased magnitude with respect to the print signal may also be utilized with a single or a plural test drop sequence to provide a layer detected signal.
  • the essential elements are a conductive charge sensing member and a set of shield plates.
  • the conductive element is located in an inductive charging relationship with the ink stream but is sufficiently spaced therefrom to insure that the ink stream cannot impinge upon said element.
  • the element senses the occurrence ofa charge on the droplet inductively and further senses the amount of charge on the droplet which can be utilized to give a positive indication of the effectiveness of the charging signal.
  • the amplitude may be utilized to time synchronization of the charging signal with the precise break-off time of the ink droplet from the stream.
  • the element can be utilized in such systems to in effect, monitor other parameters than the specific charge synchronization; such, for example, as velocity measurements by utilizing a plurality of such elements spaced at precisely known distance apart along the ink stream.
  • an inkjet recording system including an ink supply, a nozzle, means for projecting a high pressure ink stream from said nozzle which breaks up into droplets downstream therefrom, means for applying an electrical charge to individual droplets as they break off from said stream, means for deflecting said droplets and a recording medium on which said droplets impinge to produce a visible record, the improvement which comprises an inductive charge sensing means for detecting a charge on said droplets,
  • said means comprising an elongated rod shaped conductive member mounted downstream from said charging means, having a substantially flat end in close proximity to, but in non-impinging relation to said droplet stream to receive, by induction, a charge on said member corresponding to a charge on said droplets, whereby the magnitude of said charge may be determined, and wherein the spacing of the end of said rod shaped member from said stream is between 5-l0 drop diameters and wherein the width of said rod shaped member is between 5-20 drop diameters, and
  • An inductive charge sensing element as set forth in claim 1 including a pair of shield plates disposed on either side of said element and substantially perpendicular to the path of said ink droplet stream, each of said shield plates containing a hole therein through which said ink droplet stream can freely pass and circuit means connected to said shield plates whereby the charge sensing element is protected from stray fields.
  • an ink jet printing system including a linear array of closely spaced nozzles, each producing a high pressure ink jet which breaks up into a series of droplets shortly after leaving said nozzle, individual charging means located adjacent each nozzle for placing appropriate charges on said droplets, separate deflection means for each said droplet stream and a recording medium upon which said droplets impinge, the improvement which comprises an array of inductive charge sensing elements for individually detecting charges placed upon the droplets of each individual stream by their respective charging elements, said inductive charge sensing array comprising:

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US00313913A 1972-12-11 1972-12-11 Drop charge sensing apparatus for an ink jet printing system Expired - Lifetime US3836912A (en)

Priority Applications (18)

Application Number Priority Date Filing Date Title
US00313913A US3836912A (en) 1972-12-11 1972-12-11 Drop charge sensing apparatus for an ink jet printing system
DE2348724A DE2348724C3 (de) 1972-12-11 1973-09-28 Vorrichtung zum Synchronisieren der Tröpfchenbildung mit der Tröpfchenaufladung in einem Tintenstrahldrucker
AR250453A AR203730A1 (es) 1972-12-11 1973-10-09 Aparato de impresion por chorro de tinta
FR7338181A FR2210143A5 (ja) 1972-12-11 1973-10-15
IT30502/73A IT998915B (it) 1972-12-11 1973-10-24 Dispositivo per pivelare la carica induttiva portata da goccioline di inchiostro in un sistema di stampa a getto di inchiostro
GB4951273A GB1417919A (en) 1972-12-11 1973-10-24 Ink jet printer
BE137263A BE806746A (fr) 1972-12-11 1973-10-30 Dispositif de detection de charges pour imprimante a jet d'encre
AU62057/73A AU473694B2 (en) 1972-12-11 1973-10-31 Ink jet printer
JP48126855A JPS5834301B2 (ja) 1972-12-11 1973-11-13 インクフクシヤシキソウチ
SE7315534A SE392650B (sv) 1972-12-11 1973-11-16 Anordning for avkenning av droppladdningen vid en fergstraletryckanordning
CA185,962A CA1007282A (en) 1972-12-11 1973-11-16 Drop charge sensing apparatus for an ink jet printing system
NO4576/73A NO140692C (no) 1972-12-11 1973-11-30 Anordning for aa avfoele ladningen av draaper i en blekkstraaletrykkeanordning
FI3706/73A FI59885C (fi) 1972-12-11 1973-12-03 Anordning foer avkaenning av droppladdningen vid en faergstraoletryckanordning
NL7316833A NL7316833A (ja) 1972-12-11 1973-12-07
BR9674/73A BR7309674D0 (pt) 1972-12-11 1973-12-10 Aperfeicoamento em sistema de gravacao e impressao de jato de tinta
DK668673A DK143670C (da) 1972-12-11 1973-12-10 Apparat til affoeling af opladningen af draaber i en straaleskriver
MX000993U MX3023E (es) 1972-12-11 1973-12-11 Mejoras en un detector de carga inductiva para un sistema impresor con chorro de tinta
JP54119443A JPS6039553B2 (ja) 1972-12-11 1979-09-19 インク噴射式記録装置

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Application Number Priority Date Filing Date Title
US00313913A US3836912A (en) 1972-12-11 1972-12-11 Drop charge sensing apparatus for an ink jet printing system

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US3836912A true US3836912A (en) 1974-09-17

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US00313913A Expired - Lifetime US3836912A (en) 1972-12-11 1972-12-11 Drop charge sensing apparatus for an ink jet printing system

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US (1) US3836912A (ja)
JP (2) JPS5834301B2 (ja)
AR (1) AR203730A1 (ja)
AU (1) AU473694B2 (ja)
BE (1) BE806746A (ja)
BR (1) BR7309674D0 (ja)
CA (1) CA1007282A (ja)
DE (1) DE2348724C3 (ja)
DK (1) DK143670C (ja)
FI (1) FI59885C (ja)
FR (1) FR2210143A5 (ja)
GB (1) GB1417919A (ja)
IT (1) IT998915B (ja)
MX (1) MX3023E (ja)
NL (1) NL7316833A (ja)
NO (1) NO140692C (ja)
SE (1) SE392650B (ja)

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US4347935A (en) * 1979-05-16 1982-09-07 The United States Of America As Represented By The United States Department Of Energy Method and apparatus for electrostatically sorting biological cells
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US4651163A (en) * 1985-05-20 1987-03-17 Burlington Industries, Inc. Woven-fabric electrode for ink jet printer
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US6003678A (en) * 1997-08-21 1999-12-21 University Of Washington Particle separating apparatus and method
US6079836A (en) * 1998-07-20 2000-06-27 Coulter International Corp. Flow cytometer droplet break-off location adjustment mechanism
US6447108B1 (en) * 1996-12-23 2002-09-10 Domino Printing Sciences, Plc Continuous inkjet printhead control
US6450608B2 (en) * 1999-12-22 2002-09-17 Hewlett-Packard Company Method and apparatus for ink-jet drop trajectory and alignment error detection and correction
USRE37862E1 (en) * 1985-01-31 2002-10-01 Thomas G. Hertz Method and apparatus for high resolution ink jet printing
US20060180517A1 (en) * 2005-01-12 2006-08-17 Beckman Coulter, Inc. Methods and apparatus for sorting particles hydraulically
US20070064066A1 (en) * 2005-09-16 2007-03-22 Eastman Kodak Company Continuous ink jet apparatus and method using a plurality of break-off times
US20110197664A1 (en) * 2008-03-25 2011-08-18 Rhodia Operations Method and apparatus for determining the interfacial tension between two liquids
US10308013B1 (en) 2017-12-05 2019-06-04 Eastman Kodak Company Controlling waveforms to reduce cross-talk between inkjet nozzles

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US3977010A (en) * 1975-12-22 1976-08-24 International Business Machines Corporation Dual sensor for multi-nozzle ink jet
JPS5282337A (en) * 1975-12-29 1977-07-09 Hitachi Ltd Ink jet recorder
JPS5822354B2 (ja) * 1977-06-18 1983-05-09 株式会社日立製作所 インクジェット記録装置
JPS57191541U (ja) * 1981-06-01 1982-12-04
JPS57191542U (ja) * 1981-06-01 1982-12-04
CH650590A5 (fr) * 1982-04-16 1985-07-31 Gerard Andre Lavanchy Procede et dispositif de mesure du debit ou de la qualite granulometrique d'un materiau pulverulent.
US4590483A (en) * 1983-04-29 1986-05-20 Imaje S.A. Ink jet printer with charging control of ink-drop flow velocity
FR2545041B1 (fr) * 1983-04-29 1985-08-02 Imaje Sa Dispositif de controle de charge des gouttes et tete d'imprimante a projection d'encre qui en est equipee
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US3953860A (en) * 1973-03-12 1976-04-27 Nippon Telegraph And Telephone Public Corporation Charge amplitude detection for ink jet system printer
US3886564A (en) * 1973-08-17 1975-05-27 Ibm Deflection sensors for ink jet printers
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US4032924A (en) * 1974-10-31 1977-06-28 Nippon Telegraph And Telephone Public Corporation Distortion reduction in ink jet system printer
US3969733A (en) * 1974-12-16 1976-07-13 International Business Machines Corporation Sub-harmonic phase control for an ink jet recording system
JPS5237431A (en) * 1975-09-19 1977-03-23 Hitachi Ltd Ink sensor for ink jet recording device
US4121223A (en) * 1975-09-19 1978-10-17 Hitachi, Ltd. Ink jet recording apparatus with an improved ink sensor
EP0016628A3 (en) * 1979-03-19 1980-10-15 Xerox Corporation Fiber optic sensing apparatus for sensing the relative position of ink droplets or other objects of similar size in flight
EP0016628A2 (en) * 1979-03-19 1980-10-01 Xerox Corporation Fiber optic sensing apparatus for sensing the relative position of ink droplets or other objects of similar size in flight
US4347935A (en) * 1979-05-16 1982-09-07 The United States Of America As Represented By The United States Department Of Energy Method and apparatus for electrostatically sorting biological cells
US4317520A (en) * 1979-08-20 1982-03-02 Ortho Diagnostics, Inc. Servo system to control the spatial position of droplet formation of a fluid jet in a cell sorting apparatus
US4318483A (en) * 1979-08-20 1982-03-09 Ortho Diagnostics, Inc. Automatic relative droplet charging time delay system for an electrostatic particle sorting system using a relatively moveable stream surface sensing system
US4318480A (en) * 1979-08-20 1982-03-09 Ortho Diagnostics, Inc. Method and apparatus for positioning the point of droplet formation in the jetting fluid of an electrostatic sorting device
US4318481A (en) * 1979-08-20 1982-03-09 Ortho Diagnostics, Inc. Method for automatically setting the correct phase of the charge pulses in an electrostatic flow sorter
US4318482A (en) * 1979-08-20 1982-03-09 Ortho Diagnostics, Inc. Method for measuring the velocity of a perturbed jetting fluid in an electrostatic particle sorting system
US4325483A (en) * 1979-08-20 1982-04-20 Ortho Diagnostics, Inc. Method for detecting and controlling flow rates of the droplet forming stream of an electrostatic particle sorting apparatus
US4417256A (en) * 1980-05-09 1983-11-22 International Business Machines Corporation Break-off uniformity maintenance
EP0039772A1 (en) * 1980-05-09 1981-11-18 International Business Machines Corporation Multinozzle ink jet printer and method of operating such a printer
US4333083A (en) * 1980-12-23 1982-06-01 International Business Machines Corporation Electrostatic drop sensor with sensor diagnostics for ink jet printers
EP0054711A3 (en) * 1980-12-23 1983-08-24 International Business Machines Corporation Ink jet printers and methods of testing the operation of ink jet printers
EP0054711A2 (en) * 1980-12-23 1982-06-30 International Business Machines Corporation Ink jet printers and methods of testing the operation of ink jet printers
US4612553A (en) * 1984-01-20 1986-09-16 Contraves Gmbh Method for operational status checks of 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
EP0149739A3 (en) * 1984-01-20 1985-08-21 Contraves Gmbh Method and apparatus for the ink supply in an ink jet printer
US4569226A (en) * 1984-05-02 1986-02-11 Georgia Tech. Research Institute Automated interfacial tensiometer
US4697451A (en) * 1984-05-02 1987-10-06 Georgia Tech Research Corporation Automated interfacial tensiometer
USRE37862E1 (en) * 1985-01-31 2002-10-01 Thomas G. Hertz Method and apparatus for high resolution ink jet printing
US4651163A (en) * 1985-05-20 1987-03-17 Burlington Industries, Inc. Woven-fabric electrode for ink jet printer
US6447108B1 (en) * 1996-12-23 2002-09-10 Domino Printing Sciences, Plc Continuous inkjet printhead control
US5819948A (en) * 1997-08-21 1998-10-13 Van Den Engh; Gerrit J. Particle separating apparatus and method
US6003678A (en) * 1997-08-21 1999-12-21 University Of Washington Particle separating apparatus and method
US6079836A (en) * 1998-07-20 2000-06-27 Coulter International Corp. Flow cytometer droplet break-off location adjustment mechanism
US6450608B2 (en) * 1999-12-22 2002-09-17 Hewlett-Packard Company Method and apparatus for ink-jet drop trajectory and alignment error detection and correction
US6568786B2 (en) * 1999-12-22 2003-05-27 Hewlett-Packard Development Company, L.P. Method and apparatus for ink-jet drop trajectory and alignment error detection and correction
US20060180517A1 (en) * 2005-01-12 2006-08-17 Beckman Coulter, Inc. Methods and apparatus for sorting particles hydraulically
US7392908B2 (en) 2005-01-12 2008-07-01 Beckman Coulter, Inc. Methods and apparatus for sorting particles hydraulically
US20070064066A1 (en) * 2005-09-16 2007-03-22 Eastman Kodak Company Continuous ink jet apparatus and method using a plurality of break-off times
US7673976B2 (en) * 2005-09-16 2010-03-09 Eastman Kodak Company Continuous ink jet apparatus and method using a plurality of break-off times
US8087740B2 (en) * 2005-09-16 2012-01-03 Eastman Kodak Company Continuous ink jet apparatus and method using a plurality of break-off times
US20110197664A1 (en) * 2008-03-25 2011-08-18 Rhodia Operations Method and apparatus for determining the interfacial tension between two liquids
US8613217B2 (en) * 2008-03-25 2013-12-24 Rhodia Operations Method and apparatus for determining the interfacial tension between two liquids
US10308013B1 (en) 2017-12-05 2019-06-04 Eastman Kodak Company Controlling waveforms to reduce cross-talk between inkjet nozzles
WO2019112803A1 (en) 2017-12-05 2019-06-13 Eastman Kodak Company Controlling waveforms to reduce nozzle cross-talk

Also Published As

Publication number Publication date
FI59885C (fi) 1981-10-12
AU6205773A (en) 1975-05-01
IT998915B (it) 1976-02-20
BE806746A (fr) 1974-02-15
DK143670C (da) 1982-03-01
AU473694B2 (en) 1976-07-01
JPS55113583A (en) 1980-09-02
JPS4990019A (ja) 1974-08-28
FR2210143A5 (ja) 1974-07-05
DE2348724B2 (de) 1977-11-03
CA1007282A (en) 1977-03-22
SE392650B (sv) 1977-04-04
FI59885B (fi) 1981-06-30
NO140692B (no) 1979-07-09
JPS6039553B2 (ja) 1985-09-06
GB1417919A (en) 1975-12-17
MX3023E (es) 1980-02-15
DK143670B (da) 1981-09-21
NL7316833A (ja) 1974-06-13
BR7309674D0 (pt) 1974-09-05
JPS5834301B2 (ja) 1983-07-26
DE2348724A1 (de) 1974-06-27
DE2348724C3 (de) 1978-07-06
NO140692C (no) 1979-10-17
AR203730A1 (es) 1975-10-15

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