US3828354A - Ink drop charge compensation method and apparatus for ink drop printer - Google Patents

Ink drop charge compensation method and apparatus for ink drop printer Download PDF

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Publication number
US3828354A
US3828354A US00401330A US40133073A US3828354A US 3828354 A US3828354 A US 3828354A US 00401330 A US00401330 A US 00401330A US 40133073 A US40133073 A US 40133073A US 3828354 A US3828354 A US 3828354A
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United States
Prior art keywords
correction
drop
signals
drops
scanning order
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Expired - Lifetime
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US00401330A
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English (en)
Inventor
H Hilton
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International Business Machines Corp
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International Business Machines Corp
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Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00401330A priority Critical patent/US3828354A/en
Priority to DE19742402541 priority patent/DE2402541C3/de
Priority to IT25099/74A priority patent/IT1017112B/it
Application granted granted Critical
Publication of US3828354A publication Critical patent/US3828354A/en
Priority to FR7428146A priority patent/FR2245490B1/fr
Priority to CA207,956A priority patent/CA1001216A/en
Priority to JP49103972A priority patent/JPS5247286B2/ja
Priority to GB4034674A priority patent/GB1435856A/en
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
    • B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection

Definitions

  • ABSTRACT An ink drop printer for correcting drop-to-drop interactions by controlling the charge applied to a drop being formed based on the position to which the drop is to be deflected on the print medium, the charge placed on a selected number of previously formed drops and the charge to be placed on a selected number of drops to be formed.
  • FIG 4 SECOND LEAD(Le2Ei) POSITION PATENIEDAUB 61w 3.828.354
  • This invention relates to an ink drop printing apparatus and more particularly to improved apparatus for producing'more accurate drop deflection and placement on a print medium.
  • an ink drop printer in which ink drops are charged according to an information signal and deflected for proper placement on'the print medium to produce the designated character.
  • the appropriate charge voltage for each drop is generated by algebraically combining a positional signal defining a particular drop placement position, a signal generated in response to the charge placed on a predetermined number of previously formed drops and a signal derived from the charge to be placed on a selected number of drops to be formed.
  • FIG. 1 is a diagrammatic schematic" view of the ink jet printing apparatus embodying the invention
  • FIG. 2 is a schematic block diagram of the charge voltage generator with correction according to the invention.
  • FIG. 3 is a diagram showing possible ink drop placement according to one matrix scanning order
  • FIG. 4 shows a series of graphs of matrix position vs. error voltage for induction error correction
  • FIG. 5 shows a series of graphs of matrix positions vs. error voltage for correction of flight errors
  • FIG. 6 is a schematic block diagram of a specific em bodiment of the control means utilizing digital techmques
  • FIG. 7 is a schematic block diagram of an alternate embodiment of the control means using analog techniques
  • FIG. 8 is a schematic block diagram of a third embodiment'of the control means utilizing analog techmques.
  • FIG. 1 there is shown an ink drop print? ing apparatus in accordance with the invention.
  • This apparatus has an ink pressure system 10 suitably connected so that ink is driven through a plurality of nozzles 11 at high pressure to form a plurality of jets 12 each of which is controllable to print character's intwo adjacent print positions in the print line.
  • An' electromechanical transducer 14 is provided and signal source 15 is utilized to energize transducer 14 to vibrate the jet systems so that the jets break up in synchronism with the impressed vibration to form a series of uniform spaced ink drops 16.
  • a charge electrode 18 in the vicinity of the jet stream can be used to induce a charge on that drop.
  • the charge is trapped so that the drop is subject to the action of a subsequent electrostatic field.
  • Charging of each drop is accomplished by the instantaneous value of the voltage produced at the instant of drop breakoff by control means 20.
  • the drop is deflected by a fixed electrostatic field produced by deflection means 22 when energized by a suitable high voltage source 24.
  • the amount of deflection produced by the electrostatic field is proportional to the amount of charge that has been induced by the charging electrode on the drop so that a control exists as to where a droplet may be placed on print medium 26.
  • the electrostatic field is operable to produce a one-dimensional line scan to form line sections of a character and the transverse motion of the print medium 26 produces another dimension so that repeated line scans can generate a total character.
  • many areas do not receive ink drops and unwanted drops are deflected by a suitable charge so that they enter into sump means 28 for recirculation within the ink system.
  • the voltage V applied to the charge electrode is determined by the position to which the drop is to be deflected.
  • the voltage V is calculated as before, but before being applied to the charge electrode is modified based on whether or not the surrounding drops have been charged.
  • V Nominal voltage to deflect to position X with no other drops deflected
  • C 0, l, to represent the logical condition of surrounding drop deflections
  • B ,,,,,, the Mth correction term for drop N.
  • This equation would be used directly if one was implementing a read only memory (ROM) correction scheme.
  • the first requirement for developing a specific correction is that a sequential matrix scanning order be defined whichidentifies for each clock period the position to which a drop will go if deflected. Table 1 gives this sequence both in position number (ascending. order from the sump) and the nominal charge electrode voltage for a particular matrix scanning order chosen for purposes of example.
  • FIG. 3 shows the drop location on the paper of sequential drops according to the matrix scanning order of Table l.
  • the matrix scanning order given for purposes of example is described in greater detail and claimed in the above-identified application Ser. No. 325,494.
  • this matrix scanning order the drops issuing sequentially from nozzle 11 are never printed adjacent to one another. This placement maximizes the inflight distance between successive ink drops thereby reducing drop interaction.
  • the total print coverage of the head shown in the specific embodiment is two character positions of 30 matrix position numbers as shown in FIG. 1.
  • the slight misalignment in the'printing which results from the non-sequential printing can be. corrected by displacing the deflection plates 22 a sufficient angle ()5 with respect to the print line.
  • Table l defines the charge electrode voltage for each period for the case when an isolated drop is deflected.
  • the charge electrode voltage is zero volts.
  • the charge electrode voltage assumes the voltage in the table (204 volts for period 19, for example). Without correction, the data stream and the matrix scanning order is. all that is needed to define the charge electrode voltage.
  • FIG. 4 represents the magnitude for the matrix scanning order shown in FIG. 3.
  • the number of drops considered for the correction is determined by the print pa rameters and the residual allowable error. Plotted in FIG. 4 is the required correction voltage to achieve the corrected charge on the drop versus the matrix position number for the drop for a'number of drops chosen to meet assumed error specifications.
  • correction voltages can be determined experimentally or by calculations from theoretical models of drop charging and flight interaction. These corrections are needed whether or not the drop is deflected and are linear with the affecting drops charge.
  • the correction for the first lead (previously formed) drop and second lead drop are shown.
  • the third lead drop was considered to be below the error threshold so no correction is included for this drop.
  • the ertors are designated as Lel El and Le2 E1.
  • the E1 identifies the error source as charge induction and Lel and Le2 refer to the first lead drop and second lead drop respectively.
  • the second error source is flight interaction.
  • flight two charged drops interact through their charges (electrostatic repulsion) and through the lead drop wake (aerodynamic drag reduction). Both of these effects cause errors in the landing position of a drop.
  • these errors can also .be corrected by charge electrode voltage modification.
  • the correction values for these interactions are shown in FIG. 5 for the chosen matrix scanning order. These errors are designated Le4 E2, Le2 E2, Lel E2, Lal E2 and U12 E2.
  • the E2 designates flight errors and the prefix refers to the relative drop sequence number as Le for lead drop (previously formed) and La for lag (to be formed) drop.
  • the flight corrections are needed only when the subject drop is deflected.
  • FIG. 2 A general block diagram of control means according to the invention is shown in FIG. 2.
  • a control means 32 is provided to supply signals to coordinate the transfer of data in the charge signal generating means with other circuits and components of the printing system such as head phasing, control of paper, ink pressure etc.
  • the data to be printed is supplied by data source means 34 and the data is supplied on a serial basis to data stream means 36.
  • Clock 'pulse generating means 38 provides a series of pulses in synchronism with ink drop formation.
  • Clock pulse generating means 38, data stream means 36 and control circuits 32 may be provided as hard wired circuits, as a special purpose com- Puter, or by rz lx wsra l sisev a .M2229 stored in a Read Only Storage device 62.
  • the correction provided by Read OnlyStorage device 62 corresponds to the error voltage shown in FIG. 4 for induction errors and in FIG. 5 for flight errors for thespecitied matrix position.
  • a partial Read Only Store map is.
  • the primary deflection signal and the combined correction signals are combined in adder 64 to produce a digital signal indicative of the charge to be placed on the charge electrode 18 for the drop being formed.
  • This signal is converted to an equivalent analog signal in digital-to-analog converter 66 and this signal at terminal 68 is coupled to charge electrode 18 to produce the proper charge on the drop being formed to produce the drop deflection for the characterspecified by'the input data.
  • a primary deflection signal generating means 40 is provided to generate the primary deflection signal substantially as shown in Table I for the selected matrix scanning order.
  • a first correction signal generating means 44 is provided to generate an induction correction signal on line 46 and a second correction signal generating means 42 is provided to generate flight correction signals online 48.
  • Adder means 50 is provided to produce an algebraic sum of the primary deflection signal on line 52, the flight correction signal on line 48 and the induction correction signal on line 46.
  • the output of adder means at terminal 54 is coupled to the charge electrode 18 to produce the proper charge on the drop being formed so that the drop is de-' flected for accurate placement on print medium 26 to produce the character specified by the input data.
  • the clock signal generating means comprises a five-bit clock counter 56.
  • the data stream means comprises a seven-bit register 58.
  • register 58 is a serial-in, parallel-out shiftregister which has data at all times for the last four drops formed (1 to 4), the drop being formed (0) and the next two drops to be formed (+1, +2).
  • the primary deflection signal generator 60 produces a digital output corresponding to the deflection signal specified in Table I for the 30 counts provided by the clock counter 56 to represent the matrix positions.
  • the primary deflection signal generator comprises logic circuits which transform the clock count to a binary weighted code which corresponds to the voltage values required for the primary deflection voltage. All the correction is generated by accessing the correction ROS 62.
  • the memory address register 66 for ROS 62 utilizes address data from two sources, six bits from the data stream and the five bits from clock counter 56. At each address in ROS 62 is the correction demanded by the bit pattern from the data stream and the clock count.
  • Table 2 shows the partial contents of ROS 62.
  • the left hand column shows the data stream values and the second column indicates the correction segments (from FIGS. 4 and 5) that each pattern invokes.
  • Representative matrix position values are shown which designate the correction value stored at the address designated by the clock count and the data stream.
  • the output of ROS 62 assumes a primary weighted code equal to the contents of that address.
  • the primary deflection voltage in binary code and the correction voltage from ROS 62 are algebraically added in adder 64 to produce a binary code corresponding to the corrected voltage for charge electrode 18. These signals are applied to DAC 66 to produce an analog signal which is proportional to the required charge voltage, and this signal is applied directly to the charge electrode amplifier.
  • The'capacity of ROS 62 for the embodiment described above is 2,048 six-bit words.
  • One simple variation in this control circuit is to extend the capacity of ROS 62 to 8 bits which permits the storage of both the primary deflection code and the correction code thereby eliminating the deflection code generator 60 and adder 64.
  • a second variation of this control embodiment is to break up the correction into independent parts (segments which can be linearly summed) by adding a register to the adder and multiple access to the ROS.
  • the corrected voltage code could be generated by summing the component corrections. In this case, the number of addressbits for the ROS would be reduced from II to 8 bits clock count, 3 pattern), but
  • FIG. 6 is attractive since the correction hardware can be multiplexed between many heads with an all-digital interface. On' the input side the data stream for each head is multiplexed to the data stream input and in this case the data would be entered into register 58 in parallel instead of serially. This arrangement would also require a register assigned to each head to latch up the output of the adder by latch 65 (FIG. 6) and supply the input to its DAC 67'.
  • the embodiment of the charge signal generating means shown in FIG. 7 hasthe same inputs to shift register 58 and the primary'deflection code generator 60 is identical. The addressing is also accomplished by clock counter 56.
  • the primary deflection code is generated by generator 60 and coupled directly to DAC 70 to produce the primary deflection signal on line 7 1.
  • the primary deflection signal is also coupled to the inputof lead I register 72.
  • the lead I register 72 and lead 2 register 74 are parallel-in and parallel-out registers and these registers are clocked synchronously with the data stream and clock counter 56.
  • the output of lead I register 72 is coupled to a second DAC 76 and to the inputs of the lead 2 register 74.
  • the lead 2 register outputs are coupled to a third DAC 78.
  • the contents of the lead I register and the lead 2 register are the deflection code for drops n-1 and n-2 respectively, With the appropriate gain settings on DACs 76 and 78, the DAC outputs generate the LelEl term on line79 and the Le2El term on line 80.
  • the E2 terms are generated by logically decoding each segment in FIG. 5 and gating an analog signal which approximates that segment.
  • a segment refers to a correction which can be implemented by a term AV which is approximately equal to A+BV,,, or in other words, the correction voltage equals a constant and a term proportional to the nominal voltage.
  • the logical AND circuits 80 combine the present bit DS(O) and the interferring conditions DS(fl) to identify the data de- 5 pendent correction terms needed.
  • the clock is de-' coded into groups of matrix positions which correspond to the correction segments. These two sets of inputs are combined in AND circuits 82 to produce the correction logic gates.
  • Each AND gate corresponds to one of the correction segments and is the gating signal to one of the analog gates 84.
  • the analog gates have as their input the primary deflection term on line 71 and a DC level with the appropriate impedances toproduce the required A+l?tV, term when the gate is open.
  • the primary deflection term, the two E1 terms and the 8 E2 terms are summed by summing amplifier 86 to produce the proper charge voltage at terminal 88.
  • the embodiment shown in FIG. 8 is similar to the previous embodiments in the generation of the primary deflection signal.
  • the primary deflection signal is coupled to DAC 90 and this signal is gated by analog gate 92 to produce the primary deflection voltage.
  • the nominal deflection voltage is available for use in generating the E1 correction terms- Five more. terms are required for the E1 terms and the AND gates 94 are not conditioned by DS(O).
  • Generation of all the correction terms is now the same as the generation of the E2 terms in the previous embodiment.
  • the primary deflection voltage and the 13 correction terms are summed in summing amplifier 96 to produce the corrected charge electrode voltage.
  • the first correction signal and the second correction signal to apply to a charging electrode so that said drop being formed can be deflected in a constant electrostatic field to the place on the record member to produce characters designated by said character information signals.
  • control means for producing signals to coordinate the generation of said deflection signal and the other com ponents of said printer.
  • control means comprises:
  • the apparatus according to claim 4 comprising means for generating a plurality of induction error correction signals and a plurality of flight error correction signals, and

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US00401330A 1973-01-22 1973-09-27 Ink drop charge compensation method and apparatus for ink drop printer Expired - Lifetime US3828354A (en)

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Application Number Priority Date Filing Date Title
US00401330A US3828354A (en) 1973-09-27 1973-09-27 Ink drop charge compensation method and apparatus for ink drop printer
DE19742402541 DE2402541C3 (de) 1973-01-22 1974-01-19 Steuersystem für einen Tintenstrahldrucker
IT25099/74A IT1017112B (it) 1973-09-27 1974-07-12 Ta da gioccioline di inchiostro in una stampatrice a gettoapparecchiatura e sistema per compensare la carica portata di inchiostro
FR7428146A FR2245490B1 (it) 1973-09-27 1974-08-08
CA207,956A CA1001216A (en) 1973-09-27 1974-08-27 Ink drop charge compensation method and apparatus for ink drop printer
JP49103972A JPS5247286B2 (it) 1973-09-27 1974-09-11
GB4034674A GB1435856A (en) 1973-09-27 1974-09-17 Ink drop printer

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US00401330A US3828354A (en) 1973-09-27 1973-09-27 Ink drop charge compensation method and apparatus for ink drop printer

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JP (1) JPS5247286B2 (it)
CA (1) CA1001216A (it)
FR (1) FR2245490B1 (it)
GB (1) GB1435856A (it)
IT (1) IT1017112B (it)

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946399A (en) * 1974-11-15 1976-03-23 A. B. Dick Company Charge compensation network for ink jet printer
JPS5152238A (it) * 1974-10-31 1976-05-08 Nippon Telegraph & Telephone
JPS5152240A (it) * 1974-10-31 1976-05-08 Nippon Telegraph & Telephone
US3971039A (en) * 1973-11-24 1976-07-20 Nippon Telegraph And Telephone Public Corporation Ink jet system printer with temperature compensation
US3992712A (en) * 1974-07-03 1976-11-16 Ibm Corporation Method and apparatus for recording information on a recording surface
US4074278A (en) * 1976-12-22 1978-02-14 The Mead Corporation Compensation circuit for channel to channel crosstalk
US4080606A (en) * 1975-05-09 1978-03-21 Hitachi, Ltd. Ink jet printer
US4086601A (en) * 1976-03-30 1978-04-25 International Business Machines Corporation Sequential ink jet printing system with variable number of guard drops
US4086602A (en) * 1975-02-26 1978-04-25 Hitachi, Ltd. Printing video signal information using ink drops
FR2375989A1 (fr) * 1976-12-30 1978-07-28 Ibm Systeme d'impression par projection d'encre pourvu d'un dispositif de compensation des erreurs dues aux variations de vitesse des gouttelettes et de leur temps de vol
US4107698A (en) * 1977-02-10 1978-08-15 International Business Machines Corporation Ink jet printer apparatus and method of operation
EP0016360A1 (en) * 1979-03-26 1980-10-01 International Business Machines Corporation Ink drop compensation in ink jet printers
US4229749A (en) * 1979-03-26 1980-10-21 International Business Machines Corporation Ink drop compensation based on print-data blocks
EP0020997A1 (fr) * 1979-06-27 1981-01-07 International Business Machines Corporation Imprimante à projection d'encre comportant un dispositif pour commander la position des gouttelettes d'encre sur un support d'impression
EP0020984A1 (en) * 1979-06-29 1981-01-07 International Business Machines Corporation Ink jet printing system and method of generating liquid droplets
US4281333A (en) * 1979-02-14 1981-07-28 Nippon Electric Co., Ltd. Ink-on-demand type ink-jet printer with coordinated variable size drops with variable charges
JPS56110945U (it) * 1980-12-10 1981-08-27
US4310845A (en) * 1979-03-26 1982-01-12 International Business Machines Corporation Ink drop compensation based on dynamic, print-data blocks
US4321607A (en) * 1980-06-17 1982-03-23 International Business Machines Corporation Scaling aerodynamic compensation in an ink jet printer
US4370664A (en) * 1980-04-14 1983-01-25 Ricoh Company, Ltd. Ink jet printing apparatus
EP0073672A2 (en) * 1981-08-27 1983-03-09 Xerox Corporation Ink jet marking array and method
US4384295A (en) * 1980-03-26 1983-05-17 Cambridge Consultants Ltd. Liquid jet printing apparatus using a raster of drops to effect printing
US4426652A (en) 1980-10-16 1984-01-17 Ricoh Company, Ltd. Ink jet printing apparatus
EP0118285A2 (en) * 1983-03-02 1984-09-12 Xerox Corporation Ink jet interlace strategy
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
US4491852A (en) * 1982-07-02 1985-01-01 Ricoh Company, Ltd. Ink jet printing apparatus using guard drops
US4520368A (en) * 1983-08-10 1985-05-28 Xerox Corporation Ink jet printing method and apparatus
US4555710A (en) * 1981-12-20 1985-11-26 Ricoh Company, Ltd. Charge-controlled ink-jet printing method and apparatus
US4577197A (en) * 1985-01-17 1986-03-18 Xerox Corporation Ink jet printer droplet height sensing control
US4596990A (en) * 1982-01-27 1986-06-24 Tmc Company Multi-jet single head ink jet printer
US6257690B1 (en) * 1998-10-31 2001-07-10 Hewlett-Packard Company Ink ejection element firing order to minimize horizontal banding and the jaggedness of vertical lines
US6511163B1 (en) 1998-03-12 2003-01-28 Iris Graphics, Inc. Printing system
WO2003035399A1 (en) * 2001-10-22 2003-05-01 Videojet Technologies Inc. Printing method for continuous ink jet printer
EP1314766A1 (en) 2001-11-23 2003-05-28 Sicpa Holding S.A. Pigmented ink composition
US6626527B1 (en) 1998-03-12 2003-09-30 Creo Americas, Inc. Interleaved printing
US20060197803A1 (en) * 2005-03-07 2006-09-07 Steiner Thomas W Apparatus and method for electrostatically charging fluid drops

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Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971039A (en) * 1973-11-24 1976-07-20 Nippon Telegraph And Telephone Public Corporation Ink jet system printer with temperature compensation
US3992712A (en) * 1974-07-03 1976-11-16 Ibm Corporation Method and apparatus for recording information on a recording surface
JPS5152238A (it) * 1974-10-31 1976-05-08 Nippon Telegraph & Telephone
JPS5152240A (it) * 1974-10-31 1976-05-08 Nippon Telegraph & Telephone
JPS5415380B2 (it) * 1974-10-31 1979-06-14
JPS54142B2 (it) * 1974-10-31 1979-01-06
US3946399A (en) * 1974-11-15 1976-03-23 A. B. Dick Company Charge compensation network for ink jet printer
US4086602A (en) * 1975-02-26 1978-04-25 Hitachi, Ltd. Printing video signal information using ink drops
US4080606A (en) * 1975-05-09 1978-03-21 Hitachi, Ltd. Ink jet printer
US4086601A (en) * 1976-03-30 1978-04-25 International Business Machines Corporation Sequential ink jet printing system with variable number of guard drops
FR2375048A1 (fr) * 1976-12-22 1978-07-21 Mead Corp Circuit d'application d'un potentiel compense pour imprimante a jets d'encre
US4074278A (en) * 1976-12-22 1978-02-14 The Mead Corporation Compensation circuit for channel to channel crosstalk
FR2375989A1 (fr) * 1976-12-30 1978-07-28 Ibm Systeme d'impression par projection d'encre pourvu d'un dispositif de compensation des erreurs dues aux variations de vitesse des gouttelettes et de leur temps de vol
US4107698A (en) * 1977-02-10 1978-08-15 International Business Machines Corporation Ink jet printer apparatus and method of operation
US4281333A (en) * 1979-02-14 1981-07-28 Nippon Electric Co., Ltd. Ink-on-demand type ink-jet printer with coordinated variable size drops with variable charges
US4229749A (en) * 1979-03-26 1980-10-21 International Business Machines Corporation Ink drop compensation based on print-data blocks
EP0020851A1 (en) * 1979-03-26 1981-01-07 International Business Machines Corporation Ink jet printers with ink drop compensation and method of ink drop compensation
EP0016360A1 (en) * 1979-03-26 1980-10-01 International Business Machines Corporation Ink drop compensation in ink jet printers
US4310845A (en) * 1979-03-26 1982-01-12 International Business Machines Corporation Ink drop compensation based on dynamic, print-data blocks
EP0020997A1 (fr) * 1979-06-27 1981-01-07 International Business Machines Corporation Imprimante à projection d'encre comportant un dispositif pour commander la position des gouttelettes d'encre sur un support d'impression
US4303925A (en) * 1979-06-27 1981-12-01 International Business Machines Corporation Method and apparatus for controlling the position of printed ink droplets
EP0020984A1 (en) * 1979-06-29 1981-01-07 International Business Machines Corporation Ink jet printing system and method of generating liquid droplets
US4384295A (en) * 1980-03-26 1983-05-17 Cambridge Consultants Ltd. Liquid jet printing apparatus using a raster of drops to effect printing
US4370664A (en) * 1980-04-14 1983-01-25 Ricoh Company, Ltd. Ink jet printing apparatus
US4321607A (en) * 1980-06-17 1982-03-23 International Business Machines Corporation Scaling aerodynamic compensation in an ink jet printer
US4426652A (en) 1980-10-16 1984-01-17 Ricoh Company, Ltd. Ink jet printing apparatus
JPS56110945U (it) * 1980-12-10 1981-08-27
JPS5832931Y2 (ja) * 1980-12-10 1983-07-22 日本電信電話株式会社 インクジエツトプリンタ−
US4395716A (en) * 1981-08-27 1983-07-26 Xerox Corporation Bipolar ink jet method and apparatus
EP0073672A3 (en) * 1981-08-27 1984-05-02 Xerox Corporation Ink jet marking array and method
EP0073672A2 (en) * 1981-08-27 1983-03-09 Xerox Corporation Ink jet marking array and method
US4555710A (en) * 1981-12-20 1985-11-26 Ricoh Company, Ltd. Charge-controlled ink-jet printing method and apparatus
US4596990A (en) * 1982-01-27 1986-06-24 Tmc Company Multi-jet single head ink jet printer
US4491852A (en) * 1982-07-02 1985-01-01 Ricoh Company, Ltd. Ink jet printing apparatus using guard drops
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
EP0118285A2 (en) * 1983-03-02 1984-09-12 Xerox Corporation Ink jet interlace strategy
EP0118285A3 (en) * 1983-03-02 1985-08-28 Xerox Corporation Ink jet interlace strategy
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Also Published As

Publication number Publication date
CA1001216A (en) 1976-12-07
FR2245490A1 (it) 1975-04-25
FR2245490B1 (it) 1976-10-22
IT1017112B (it) 1977-07-20
JPS5061944A (it) 1975-05-27
GB1435856A (en) 1976-05-19
JPS5247286B2 (it) 1977-12-01

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