US3805274A - Ink jet recording with character distortion compensation - Google Patents

Ink jet recording with character distortion compensation Download PDF

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Publication number
US3805274A
US3805274A US00338746A US33874673A US3805274A US 3805274 A US3805274 A US 3805274A US 00338746 A US00338746 A US 00338746A US 33874673 A US33874673 A US 33874673A US 3805274 A US3805274 A US 3805274A
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United States
Prior art keywords
vertical
deflection
horizontal
signal
counter
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Expired - Lifetime
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US00338746A
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English (en)
Inventor
T Kashio
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Casio Computer Co Ltd
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Casio Computer Co Ltd
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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
    • B41J2/13—Ink jet characterised by jet control for inclination of printed pattern

Definitions

  • An ink jet type recording apparatus has an ink jet recording head 11 as schematically illustrated in FIG. 1.
  • the recording head 11 is provided with a nozzle 12 for jetting an ink droplet and an acceleration electrode 13 for accelerating the jetted ink droplet.
  • Ink is supplied by means of an ink pump (not shown) to the nozzle 12 from the mouth of which ink droplet 14 is jetted in the particle form under an electrical field from the acceleration electrode 13.
  • the jetted ink droplet 14 is deflection-controlled by a vertical and horizontal system 15 so that a predetermined character, figure etc. are recorded on a recording paper.
  • FIGS. 2 and 3 In a case where characters are continuously recorded on a recording paper using the single ink jet recording head 11 the arrangement is as shown in FIGS. 2 and 3.
  • guide rails 17 are arranged opposite to and parallel to a recording paper 16.
  • the recording head 11 is moved in a direction as indicated by arrows.
  • deflection voltages corresponding to a character signal are fed to the deflection system 15 of the recording head 11 to the deflection system 15 of the recording head 11 to the deflection system 15 of the recording head 11 to the deflection system 15 of the recording head 11 to the deflection system 15 of the recording head 11 .
  • the object of the invention is to provide an ink jet type recording apparatus capable of recording undistorted characters on a recording paper even when a re cording head is continuously moved to effect a recording. According to this invention the above-mentioned drawbacks can be overcome.
  • FIG. 1 is a schematic diagram for explaining an ink jet type recording head
  • FIG. 2 is a view for showing the manner in which the recording head is located
  • FIG. 3 is a side view of FIG. 2;
  • FIGS. 4A to 4C are illustrative representations of characters recorded
  • FIG. 5 is a block diagram for explaining an ink jet type recording apparatus according to one embodiment of this invention.
  • FIG. 6 is a graphical representation of a character for explaining the above embodiment.
  • FIGS. 7A to 7D are signal waveforms for explaining the above embodiment.
  • reference numeral 21 shows a character selecting circuit.
  • a character signal obtained from the character selecting circuit 21 is fed to a memory circuit 22.
  • a count signal for example, from a scale-of-24 counter 24 which is counted by a signal from a clock pulse generating circuit 23.
  • a count signal supplied to the memory circuit 22 character signals are read out, and driven as coordinate signals in the vertical and horizontal directions, from the memory circuit 22.
  • a figure [2] is described by a plurality of dots d d for example, as shown in FIG.
  • X- and Y-axis positions of the dot d are firstly read out, as digital values, from the memory circuit 22 by a count signal, corresponding to a counting value (l), from the counter 24. That is, signals of Y 20, X 0 are derived by the counting value (1) of the counter 24. These signals are coupled to updown counters 25 and 26 corresponding to the Y- and X-directions, respectively, where a count setting is effected. Thereafter, an output deviation from a preceding dot is obtained from the memory circuit 22. When the counting value of the counter 24 is (2) signals Y +4, X +4 are obtained. When the counting value of the counter 24 is (3), then signals Y 0, X +4 are obtained.
  • the up-down counters 25 and 26 are countcontrolled by these signals. That is, the counting value of the up-down counters 25 and 26 are varied as shown in FIGS. 73 and 7C. Digital outputs from the up-down shown in FIGS. 78 and 7C, from the D-A converters 27 and 28. These analog signals are fed to differential amplifiers 29 and 30 from which Y- and X-direction differential deflection voltages 29 and 30 are supplied to paired Y deflection plates 31A, 31B and paired X deflection plates 32A, 328.
  • a clock pulse from the clock pulse generating circuit 23 is applied, for example, to a ternary or scale-of-three counter 33.
  • a carrier signal, as shown in FIG. 7A, from the ternary counter 33 is applied as a driving signal to a pulse motor 34.
  • the pulse motor 34 is so controlled in its rotation that it advances one step for each three clock pulses. By this pulse motor 34 an ink jet type recording head is driven in a direction horizontal to a recording paper. When the pulse motor 34 is advanced eight steps the recording head is driven an amount corresponding to one character including a space.
  • ink droplets from a nozzle of the recording head are deflected at the Y- and X-deflection plates 31A, 31B and 32A, 32B so that characters are recorded on a recording paper.
  • the recording head is continuously moved while character signals are successively read out. As a result, a distorted character as shown in FIG. 4B is obtained.
  • a counting signal is further fed to the up-down counter 26. That is, a stepwise varying digital signal as shown in FIG. 7D is derived from the counter 24 and the counting value of the up-down counter 26 is controlled. The counting value of the updown counter 26 is so subtracted for each clock pulse that the amount of movement of the recording head is cancelled, and deflection signals from the differential amplifiers 29 and 30 cause the character to be as shown in FIG. 4C. As a result, an undistorted character is recorded on a recording paper.
  • the clock pulse as a reference for reading out the character signal and as a reference for moving the recording head, and is also synchronously associated with the movement of the recording head with the result that an undistorted, accurate character can be recorded on a recording paper.
  • the readout of the character signal is synchronously associated with the movement of the recording head.
  • a character deformation caused by the movement of the recording head can be corrected easily and with accuracy. Since the correction of a character, per se, the oscillation of saw-tooth waves and so on are not involved in this case, a very simplified construction results. Furthermore, there is no influence from the ambient temperature etc. and a very stable operation characteristic is also obtained.
  • a signal, as shown in FIG. 7D, applied to the updown counter 26 is necessary to exist only during the time period in which a character signal is present, i.e., in a case where a character [2] is recorded, to exist until a counting value (4 is encountered. Therefore, said signal effectively works only over the range corresponding to that hatched area as shown in FIG. 7D.
  • unnecessary ink droplets may be effectively collected in an ink collector by cutting out a supply of a signal from the counter 24 to the up-down counter 26.
  • the movement of the recording head is explained as corrected by a subtractive method, it is needless to say that it may also be corrected by an additive method using a coordinate setting method.
  • An ink jet type recording apparatus comprising an ink jet type recording head having means for continuously jetting droplets of ink and vertical and horizontal deflecting means arranged opposite to a recording medium for deflecting the ink droplet in vertical and horizontal directions and adapted to be movable in the horizontal direction defined by the deflecting means; means for moving the recording head in the horizontal direction; means for generating clock pulses; means set in synchronism with the clock pulse and adapted to drive said head moving means in plural steps in recording one character on the recording medium; a deflection signal supplying means set in synchronism with the clock pulse and adapted to sequentially generate vertical and horizontal signals for determining vertical and horizontal deflection amounts respectively, in an attempt to define a character consisting of a plurality of jetted ink droplets, and supply to said vertical and horizontal deflection means a character signal set completely in synchronism with the horizontal movement of the recording head, said vertical and horizontal signals being corrected according to an amount of movement of the recording head.
  • said deflection signal supplying means has a counter connected to the clock pulse generating means for counting in accordance with the clock pulse and adapted to sequentially generate an output signal in synchronism with the clock pulse; a memory storage connected to said counter, having signals corresponding to desired characters stored therein, and adapted to generate in synchronism with the output signal of the counter vertical and horizontal deflection digital signals for respectively determining vertical and horizontal deflection amounts so as to define a desired character consisting of a plurality of jetted ink droplets; a first D-A converter connected to the memory storage for converting the vertical deflection digital signal to an analog signal for supply to the vertical deflection means; and a second D-A converter connected to the memory storage for converting the horizontal deflection digital signal into an analog signal and for supplying the analog signal to the horizontal deflection means.
  • An ink jet type recording apparatus as claimed in claim 1 in which said deflection signal supplying means has a counter connected to the clock pulse generating means for counting in accordance with the clock pulse and adapted to sequentially generate an output signal in synchronism with the clock pulse; a memory storage connected to the counter, having signals corresponding to desired characters stored therein, and adapted to generate in synchronism with the output signal of the counter vertical and horizontal signals for respectively determining vertical and horizontal deflection amounts so as to define a desired character consisting of jetted ink droplets; a first up-down counter connected to said memory storage and said counter for generating in synchronism with the output signal a vertical deflection digital signal for determining a vertical deflection UNITED sTATEs PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 805374 Dated April 16, 1974 Ifiventofls) Toshio KASHIO I It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
US00338746A 1972-03-09 1973-03-07 Ink jet recording with character distortion compensation Expired - Lifetime US3805274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47023606A JPS5212009B2 (enrdf_load_stackoverflow) 1972-03-09 1972-03-09

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US3805274A true US3805274A (en) 1974-04-16

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US00338746A Expired - Lifetime US3805274A (en) 1972-03-09 1973-03-07 Ink jet recording with character distortion compensation

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US (1) US3805274A (enrdf_load_stackoverflow)
JP (1) JPS5212009B2 (enrdf_load_stackoverflow)
CH (1) CH555744A (enrdf_load_stackoverflow)
DE (1) DE2311601C3 (enrdf_load_stackoverflow)
FR (1) FR2175509A5 (enrdf_load_stackoverflow)
GB (1) GB1407746A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938163A (en) * 1973-01-17 1976-02-10 Nippon Telegraph And Telephone Public Corporation Printed pattern inclination control in ink jet printer
US3971033A (en) * 1975-05-27 1976-07-20 Ibm Corporation Method and apparatus for applying magnetic liquid droplets to a recording surface
US4050564A (en) * 1973-11-23 1977-09-27 International Business Machines Corporation Electronic control for optimizing carrier turnaround in printing apparatus
US4149807A (en) * 1976-03-04 1979-04-17 Facit Aktiebolag Method of typewriting or printing
US4150902A (en) * 1976-07-19 1979-04-24 Ing. C. Olivetti & C. Electronic printer having a single tracing element for tracing out alphanumeric characters
EP0025490A1 (fr) * 1979-09-17 1981-03-25 International Business Machines Corporation Imprimante à projection d'encre comportant un dispositif à inertie pour incliner le champ électrique de déviation
EP0025492A1 (fr) * 1979-09-17 1981-03-25 International Business Machines Corporation Imprimante à projection d'encre comportant un dispositif de commande d'inclinaison d'image
US4364062A (en) * 1980-05-27 1982-12-14 Sharp Kabushiki Kaisha Paper edge detection in a printer
US4618869A (en) * 1978-04-17 1986-10-21 Sharp Kabushiki Kaisha Facsimile print out system employing an ink jet system printer
US5461407A (en) * 1992-09-02 1995-10-24 Telesis Marking Systems, Inc. Marking method and apparatus using gas entrained abrasive particles

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4167741A (en) * 1977-12-23 1979-09-11 International Business Machines Corporation Raster slant control in an ink jet printer
US4138688A (en) * 1977-12-23 1979-02-06 International Business Machines Corporation Method and apparatus for automatically controlling the inclination of patterns in ink jet printers
JPS5584671A (en) * 1978-12-22 1980-06-26 Seiko Epson Corp Ink jet recorder
JPS5640559A (en) * 1979-09-10 1981-04-16 Canon Inc Recording device
JPS5649117A (en) * 1979-09-29 1981-05-02 Reiichirou Kakehashi Bedding made from core cotton material without entangling property or property blown out from fabric pore

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688034A (en) * 1968-12-06 1972-08-29 Toshio Kashio Distortion compensation in ink jet recording
US3691551A (en) * 1969-05-02 1972-09-12 Casio Computer Co Ltd System for generating tracing signals for displaying or recording characters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688034A (en) * 1968-12-06 1972-08-29 Toshio Kashio Distortion compensation in ink jet recording
US3691551A (en) * 1969-05-02 1972-09-12 Casio Computer Co Ltd System for generating tracing signals for displaying or recording characters

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938163A (en) * 1973-01-17 1976-02-10 Nippon Telegraph And Telephone Public Corporation Printed pattern inclination control in ink jet printer
US4050564A (en) * 1973-11-23 1977-09-27 International Business Machines Corporation Electronic control for optimizing carrier turnaround in printing apparatus
US3971033A (en) * 1975-05-27 1976-07-20 Ibm Corporation Method and apparatus for applying magnetic liquid droplets to a recording surface
US4149807A (en) * 1976-03-04 1979-04-17 Facit Aktiebolag Method of typewriting or printing
US4150902A (en) * 1976-07-19 1979-04-24 Ing. C. Olivetti & C. Electronic printer having a single tracing element for tracing out alphanumeric characters
US4618869A (en) * 1978-04-17 1986-10-21 Sharp Kabushiki Kaisha Facsimile print out system employing an ink jet system printer
EP0025490A1 (fr) * 1979-09-17 1981-03-25 International Business Machines Corporation Imprimante à projection d'encre comportant un dispositif à inertie pour incliner le champ électrique de déviation
EP0025492A1 (fr) * 1979-09-17 1981-03-25 International Business Machines Corporation Imprimante à projection d'encre comportant un dispositif de commande d'inclinaison d'image
US4364062A (en) * 1980-05-27 1982-12-14 Sharp Kabushiki Kaisha Paper edge detection in a printer
US5461407A (en) * 1992-09-02 1995-10-24 Telesis Marking Systems, Inc. Marking method and apparatus using gas entrained abrasive particles

Also Published As

Publication number Publication date
GB1407746A (en) 1975-09-24
DE2311601C3 (de) 1975-11-27
JPS4893231A (enrdf_load_stackoverflow) 1973-12-03
DE2311601A1 (de) 1973-09-13
DE2311601B2 (de) 1975-04-10
JPS5212009B2 (enrdf_load_stackoverflow) 1977-04-04
FR2175509A5 (enrdf_load_stackoverflow) 1973-10-19
CH555744A (de) 1974-11-15

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