US3739396A - Fluid injection recording system utilizing alternating bias field - Google Patents

Fluid injection recording system utilizing alternating bias field Download PDF

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Publication number
US3739396A
US3739396A US00198517A US3739396DA US3739396A US 3739396 A US3739396 A US 3739396A US 00198517 A US00198517 A US 00198517A US 3739396D A US3739396D A US 3739396DA US 3739396 A US3739396 A US 3739396A
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United States
Prior art keywords
nozzle
fluid
recording system
alternating bias
fluid injection
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
US00198517A
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English (en)
Inventor
K Harada
S Takeuchi
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.)
Mishima Kosan Co Ltd
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Mishima Kosan Co Ltd
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Filing date
Publication date
Application filed by Mishima Kosan Co Ltd filed Critical Mishima Kosan 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field

Definitions

  • ABSTRACT A fluid injection recording system to inject fluid such as magnetic ink from nozzlemeans o n a paper to re- [30] Foreign Application Priority Data 45/111459 cord a series of dots. Means such as alternating magm to fi MM mu fl e o.h.. 5 mt e C wk we un fl m E 2 mm .m mm w w m dw D 6 H 2 i w m Sm. m s C M l m. fi
  • the present invention relates to a fluid injection recording system by recording dots on a paper to describe letters or symbols.
  • the present invention provides a new nozzle system to the prevent sticking of the recording liquid to inner wall of the nozzle, by applying an oscillation to the liquid in the nozzle to make displacement in the nozzle and injection from the nozzle easier.
  • first and second coils are wound about a nozzle containing magnetic ink
  • a DC. current and an AC. high frequency current are applied to the first coil to magnetize the magnetic ink in one direction and further to apply oscillation to the magnetic ink to maintain the magnetic ink in an easily flowable state.
  • an input signal is applied to the second coil which is wound near the injection tip of the nozzle to magnetize the magv netic ink in the reverse direction to expel the magnetic ink which is adjacent the nozzle tip.
  • an alternating current is applied between a nozzle containing'recording fluid and an electrode opposing the nozzle.
  • the applied alternating charge is sufficiently high, the static electric field produced between the fluid in the tip of the nozzle and the opposing electrode oscillates the fluid to keep the fluid in an easily flowable state.
  • Input direct current voltage is applied between the nozzle and the electrode to charge the fluid in the nozzle to effect the injection of the fluid to the electrode.
  • FIG. 1 shows a basic diagram of the first embodiment of the fluid injection recording system utilizing alternating current bias according to the present invention
  • FIG. 2 shows a basic diagram of the second embodiment.
  • a coil 3 is wound about the main body portion of the nozzle 1 which may have a larger diameter than the tip portion of the nozzle. Across the terminals 4 and 5 of the coil 3 direct current and alternating bias current are applied to magnetize the magnetic ink 2 in one direction parallel to the longitudinal axis of the nozzle 1, and further to oscillate the magnetized magnetic ink in the nozzle. By properly selecting the direct current and alternating bias current in voltages and frequency, static and alternating magnetic fields are induced.
  • Static friction is caused between inner wall of the nozzle 1 and magnetic ink without the alternating bias current applied across the terminals 4 and 5, so that magnetic ink tends to stick to the inner wall of the nozzle.
  • magnetic ink 2 oscillates in the nozzle so that magnetic ink is maintained in an easily flowable state as dynamic friction which is far less than static friction is applied between the inner wall of the nozzle and the magnetic ink.
  • a second coil 6 is wound about near the tip end of the nozze l, and a second direct current is applied across terminals 7 and 8 to induce a magnetic field in the reverse direction induced by the first mentioned direct current applied across the terminals 4 and 5.
  • a second direct current applied across terminals 7 and 8 functions as an injection or recording signal.
  • the input signal can be a pulse or one phase of an alternating current which is synchronized to the paper feeding mechanism.
  • FIG. 2 shows diagramatically a second embodiment of the present invention.
  • a nozzle 11 which is made of an electric conductive material contains fluid 12 which may preferably be an electric conductive material.
  • An electrode 13 is disposed opposite to the tip end 14 of the nozzle 11.
  • An alternating current is applied across the terminals 15 and 16 to produce a static electric field across the nozzle 11 and the electrode 13 to cause oscillation of fluid 12 at tip end 14 of the nozzle to maintain the fluid in an easily flowable state.
  • the shape and material of the nozzles 1 and 11 can be selected as desired.
  • the nozzle can be made of nonconductive material when fluid 12 is conductive. In this case the other end of the terminal 15 is inserted in the fluid 12.
  • Means to oscillate the fluid alternating bias magnetic field, alternating bias electric field and mechanical oscillating device can be applied.
  • An alternating bias magnetic field can be effectively adopted when magnetic fluid is used or when a magnetostriction oscillating element is used.
  • An alternating bias electric field, a mechanical oscillating device and a magnetostriction oscillator can be utilized to oscillate fluid whatever the fluid is. When a mechanical oscillating device is used,
  • the primary object to oscillate the fluid is to maintain the fluid easily flowable state in the nozzle.
  • a polyphase alternating bias magnetic field' is preferably utilized to ensure an easy supply of fluid in the nozzle.
  • an input signal may be a pulse or one or more cycles of an alternating current according to the desired recording system.
  • a separating force as described in the first embodiment as well as an attracting force can be applied.
  • a magnetic field produced by an input signal can be reinforced by a static magnetic field to inject the magnetic ink.
  • the input signal also can be utilized to modulate alternating bias magnetic field, and the modulated signal can be reinforced by a static magnetic field to inject the magnetic fluid from the nozzle.
  • a static magnetic field may be modulated by an input signal, and a modulated magnetic field may be reinforced by an alternating magnetic field to inject fluid from the nozzle.
  • combinations of the above mentioned method may also be utilized.
  • the magnetic field may be replaced by an electric field to effect injection of fluid.
  • a pointed electrode or a magnetic pole piece may be disposed opposite to the nozzle, and the applied electric or magnetic field may be controlled corresponding to the input signal.
  • a plurality of nozzles may preferably be arranged transverse to the paper feed direction to limit the paper feeding to one direction, thus being easily adaptable to facsimile, teletype and other information devices.
  • a fluid injection recording system including at least one nozzle containing recording fluid which contains magnetizable material and which nozzle is adapted to inject the fluid to record on a relatively movable paper as a series of dots, the improvement comprising a first coil wound about the nozzle, a second coil wound about the nozzle, near the tip portion thereof, means to apply direct current to the first coil to magnetize the fluid in one direction, means to apply an alternating bias current to the first coil to oscillate the fluid and to maintain the fluid in an easily flowable I state, and means to apply direct current to the second coil asan input signal to magnetize the fluid in another direction and to repel the fluid in the tip portion of the nozzle to cause injection of the fluid from the nozzle.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Facsimile Heads (AREA)
US00198517A 1970-12-14 1971-11-15 Fluid injection recording system utilizing alternating bias field Expired - Lifetime US3739396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45111459A JPS5115419B1 (it) 1970-12-14 1970-12-14

Publications (1)

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US3739396A true US3739396A (en) 1973-06-12

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JP (1) JPS5115419B1 (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893131A (en) * 1973-09-04 1975-07-01 Xerox Corp Ink printer
US4315267A (en) * 1977-07-22 1982-02-09 Matsushita Electric Industrial Co., Ltd. Method of magnetofluidic recording
US4717926A (en) * 1985-11-09 1988-01-05 Minolta Camera Kabushiki Kaisha Electric field curtain force printer
US4928125A (en) * 1987-09-24 1990-05-22 Minolta Camera Kabushiki Kaisha Liquid drop ejection apparatus using a magnetic fluid
US6499839B1 (en) 1999-02-09 2002-12-31 Source Technologies, Inc. Acicular particle ink formulation for an inkjet printer system
US11334000B2 (en) 2018-06-21 2022-05-17 Hewlett-Packard Development Company, L.P. Electromagnets and print substance containers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925312A (en) * 1955-09-12 1960-02-16 Hans E Hollmann Magnetic and electric ink oscillograph
US3161882A (en) * 1960-08-05 1964-12-15 Minnesota Mining & Mfg Galvanometer using electrostatic orifice recording means
US3582954A (en) * 1969-02-24 1971-06-01 Stephen F Skala Printing by selective ink ejection from capillaries

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925312A (en) * 1955-09-12 1960-02-16 Hans E Hollmann Magnetic and electric ink oscillograph
US3161882A (en) * 1960-08-05 1964-12-15 Minnesota Mining & Mfg Galvanometer using electrostatic orifice recording means
US3582954A (en) * 1969-02-24 1971-06-01 Stephen F Skala Printing by selective ink ejection from capillaries

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893131A (en) * 1973-09-04 1975-07-01 Xerox Corp Ink printer
US4315267A (en) * 1977-07-22 1982-02-09 Matsushita Electric Industrial Co., Ltd. Method of magnetofluidic recording
US4717926A (en) * 1985-11-09 1988-01-05 Minolta Camera Kabushiki Kaisha Electric field curtain force printer
US4928125A (en) * 1987-09-24 1990-05-22 Minolta Camera Kabushiki Kaisha Liquid drop ejection apparatus using a magnetic fluid
US6499839B1 (en) 1999-02-09 2002-12-31 Source Technologies, Inc. Acicular particle ink formulation for an inkjet printer system
US11334000B2 (en) 2018-06-21 2022-05-17 Hewlett-Packard Development Company, L.P. Electromagnets and print substance containers

Also Published As

Publication number Publication date
JPS5115419B1 (it) 1976-05-17

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