Patents Examined by Alrick Bobb
  • Patent number: 5909229
    Abstract: There is provided an ink jet recording apparatus such as a bubble jet recording apparatus, comprising: an ink jet recording head in which a plurality of groups each consisting of a plurality of emission ports which are simultaneously driven are continuously arranged; a detector to detect an edge of an input image; and a second driver for sequentially changing the driving order of the groups or sequentially driving the groups which are not neighboring in accordance with the result of the edge detection by the detector. The recording head causes a volume change by an action of a heat energy which is generated from a recording element such as an electrothermal converting element or a thermal resistor element by supplying a pulse-shaped current thereto, thereby emitting an ink droplet from each opening. The recording apparatus uses a plurality of recording elements which are divided into a plurality of blocks and are driven at different timings for every block.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: June 1, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruhiko Moriguchi, Nobuyuki Watanabe, Hisashi Fukushima
  • Patent number: 5751313
    Abstract: The present invention relates to an ink passage having surface which has a film comprising a fine particle of an inorganic oxide having a hydrophilic group. The surface of the ink passage according to the present invention has a high hydrophilicity and can rapidly remove bubbles formed within the ink passage. The recording head according to the present invention need not conduct filling of a liquid in the course of transportation and can be transported in an empty state.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: May 12, 1998
    Assignee: Seiko Epson Corporation
    Inventors: Satoru Miyashita, Kiyohiko Takemoto
  • Patent number: 5652609
    Abstract: A recording device is disclosed which in a preferred embodiment comprises a recording head comprising at least one chamber having an orifice therein, at least a portion of the chamber comprising an electret transducer; a recording medium for supplying recording medium from a reservoir to the chamber, and for a voltage pulse source and electrode applying a voltage pulse to the electret to deform the electret to change the volume of the chamber and eject a quantity of recording medium from the chamber through the orifice. The invention and device is further useful in manufacturing high density printheads, operable with multiple recording mediums to print recording medium on a recording surface.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: July 29, 1997
    Assignee: J. David Scholler
    Inventors: J. David Scholler, Ayekavadi Gururaj
  • Patent number: 5650812
    Abstract: A recording head for an ink-jet printer has a plurality of holes disposed in a base portion of each of a plurality of ink-jet nozzles and has an ink discharging orifice disposed at an end tip of each of the ink-jet nozzles. Each of the holes has a diameter smaller than that of the ink discharging orifice. In this recording head for an ink-jet printer, when the supply of ink to a common ink chamber is interrupted, it is possible to stop the air flowed into the recording head in an intermediate portion of an intake path of the air so that the cost of running the recording head can be reduced.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: July 22, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Norihiro Ochi, Hisashi Yoshimura, Yoshio Kanayama
  • Patent number: 5646659
    Abstract: An ink jet recording apparatus of the present invention has an ink jet recording head having an orifice from which an ink drop is ejected and an energy generation means for ejecting an ink fluid in the orifice. A first electrode is formed in the orifice and is connected electrically to the ink fluid. A second electrode is formed in an opposite position to the orifice with a designated distance from the orifice. A voltage controller applies a first voltage during a time period from a time when an ink fluid is ejected from the orifice to a time when the ink fluid is separated in 2 or more ink drops during traveling, and immediately after applying the first voltage, applies a second voltage which has an identical polarity to a polarity of the first voltage and has an absolute value less than an absolute value of the first voltage.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: July 8, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Moriyama, Yutaka Koizumi, Hisashi Fukushima, Toshiaki Hirosawa, Torachika Osada, Haruhiko Moriguchi, Hidemi Kubota, Masami Izumizaki
  • Patent number: 5640186
    Abstract: A thermal ink-jet pen cartridge having a rigid external frame member fabricated of a rigid engineering plastic, and an interior frame structure attached thereto, formed of a sorer, more ductile plastic material than the rigid engineering plastic. An ink reservoir is defined by the interior structure and a pair of flexible bag membranes formed of a plastic material impervious to the ink and compatible with the interior member material, allowing the membranes to be joined to the interior member to form a leak-proof joint. The interior frame structure is fabricated from a polymer blend composition comprising (A) at least one polymer selected from the group consisting of a polyethylene and a copolymer of ethylene and an alpha-olefin and (B) at least one polymer selected from the group consisting of a polypropylene and a copolymer of propylene and ethylene, wherein (A) is different from (B).
    Type: Grant
    Filed: November 7, 1995
    Date of Patent: June 17, 1997
    Assignee: Hewlett-Packard Company
    Inventors: David W. Swanson, Mindy A. Hamlin, James G. Salter, Deenadayalu Chundury
  • Patent number: 5627575
    Abstract: In order to provide an ink jet print head effectively ensuring a stable print quality or capable of reducing the voltage applied to piezoelectric: elements while maintaining the volume displacement of the pressure chambers, and to provide an ink jet printer using the same, the ink jet print head of the present invention comprises a plurality of pressure chambers circularly arranged in a hounds tooth manner for allowing the passage of ink, and a plurality of ink flow paths acting as flow paths for ink flowing from the pressure chambers. It further comprises a diaphragm defining one surface of the pressure chambers, and a plurality of piezoelectric elements which apply a pressure to the pressure chambers to discharge the ink within the pressure chambers from the nozzle through the ink flow paths for printing.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: May 6, 1997
    Assignee: Rohm Co., Ltd.
    Inventors: Hisayoshi Fujimoto, Nobuhisa Ishida
  • Patent number: 5621442
    Abstract: The operation of UU type drop-on-demand ink jet printheads are enhanced by selectively incorporating therein volume modifying tapers in the ink carrying channels, means for electrically isolating portions of the actuators thereof, and/or forming a variable layer of conductive material between the upper and lower sidewall portions therefore.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: April 15, 1997
    Assignee: Compaq Computer Corporation
    Inventors: Donald J. Hayes, John R. Pies, David B. Wallace
  • Patent number: 5610644
    Abstract: A thermal ink-jet (TIJ) pen including a plastic frame structure and side covers. To attach the covers to the plastic frame without the use of adhesives, screws, thermal or ultrasonic processes, protruding metal tabs from the cover are press fit into corresponding recess features of the plastic frame. The tabs are designed to displace plastic surrounding the frame recesses to lock the cover to the frame. The resulting frame/cover seam resists shear, axial and transverse forces that occur as a result of externally applied loads to the pen.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: March 11, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Dale D. Timm, Jr., David W. Swanson, James E. Clark
  • Patent number: 5598195
    Abstract: The present invention provides an electrostatic attracting-type ink jet recording method by which an ink dot which has adhered to the recording medium or intermediate recording material can be prevented from affecting the drawing direction of the subsequently jetting ink, whereby an ink can be invariably allowed to jet onto a proper position to form an image with a high quality.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: January 28, 1997
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Toru Okamoto, Susumu Hirakata
  • Patent number: 5596351
    Abstract: An apparatus for sensing whether a liquid with a turbulent surface and contained within a vessel has fallen to a level where the liquid is substantially expended. The apparatus includes a light source for emitting light, a light sensor which is sensitive to the light emitted by the light source and which outputs a signal proportionate to the amount of light sensed, and logic for determining from fluctuations in the signal output by the light sensor when the liquid has fallen to the level in the vessel where the liquid is substantially expended. The fluctuations in the signal are caused by randomness in reflections of the emitted light due to the turbulence of the surface of the liquid. Where the vessel has a closed top and the liquid initially fills the vessel, the logic additionally uses the magnitude of the signal from the light sensor to determine when the liquid has fallen to the level where it is substantially expended.
    Type: Grant
    Filed: December 8, 1993
    Date of Patent: January 21, 1997
    Assignee: Calcomp Inc.
    Inventor: Jeffrey Stapleton
  • Patent number: 5594482
    Abstract: An ink jet printer head has a piezoelectric ceramic element with a plurality of ink reservoirs wherein at least one side wall of each reservoir is made of a piezoelectric ceramic material and has an electrode for driving the piezoelectric ceramic element formed on the wall. The electrode is covered with an inorganic passive state protective film, and the protective film has a thickness of from 0.1 .mu.m to a value smaller than 1/8 of a thickness of the wall in maximum or a density of not smaller than 1.8 g/cm.sup.3. The protective film may be formed to cover all inner surfaces of each reservoir.
    Type: Grant
    Filed: November 17, 1993
    Date of Patent: January 14, 1997
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Yumiko Ohashi
  • Patent number: 5594483
    Abstract: A thermal ink-jet pen cartridge including an ink reservoir for maintaining ink under negative pressure. The ink reservoir is coupled to the printhead via a discharge port. To prevent air bubbles from entering the reservoir via the discharge port and printhead after ink is expelled via the thermal process, a check valve is placed in the fluid path between the ink reservoir and the printhead at the discharge port. The check valve is a mesh having a very small mesh opening sufficient to prevent air bubbles from passing through under normal pressures. The check valve also serves the function of a particulate filter to prevent contamination of the printhead by particles from the ink reservoir.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: January 14, 1997
    Assignee: Hewlett-Packard Company
    Inventors: George T. Kaplinsky, David W. Swanson
  • Patent number: 5592203
    Abstract: An edge-shooter type ink jet print head and a method of its manufacture are disclosed. The print head includes members into which chambers are formed which, in turn, are equipped with devices for ejecting ink from each chamber to respectively assigned ink nozzles. A group of chambers is formed in each chamber-carrying member, on a side facing a center member. A single row of ink nozzles includes k nozzle groups which are respectively assigned to k ink chamber groups and which are formed along an edge face of a first chamber-carrying member. The first nozzle group of the k nozzle groups communicates with the chamber group formed in the first chamber-carrying member. The other k-1 nozzle groups are assigned to respective ones of the other (k-1) chamber groups. The chamber groups are supplied with ink from suction chambers and lie in further chamber-carrying members which are vertically offset relative to one another.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: January 7, 1997
    Assignee: Francotyp-Postalia GmbH
    Inventors: Wolfgang Thiel, Stephan Gunther
  • Patent number: 5583546
    Abstract: Disclosed is a combined "streak-detector" and "ink-level flow detector" on opposite sides of a single printed circuit board; each detector comprising a pair of parallel printed circuit segments adapted to be "shorted" by interposition of conductive ink and coupled to register this event in an associated detect-logic stage.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: December 10, 1996
    Assignee: Unisys Corporation
    Inventor: Andrew J. Balousek
  • Patent number: 5581288
    Abstract: Ink is reserved in a cartridge case. On this cartridge case, there are fixed an ink jet head and an electric connecting member in a stacked state. The ink jet head is constructed to include: ink supply holes adapted to be supplied with the ink from the cartridge case; ink passages communicating with the ink supply holes; nozzles formed in the leading ends of the ink passages; and ink ejecting device such as piezoelectric elements disposed to correspond to the ink passages for ejecting the ink from the nozzles. These nozzles and the ink passages are substantially perpendicular. Moreover, the stacking direction, the ink supply direction from the cartridge case to the ink supply holes, and the ink ejecting direction from the nozzles are made substantially identical. The electric connecting member is made of a flexible frame or a metal lead frame. Thus, the ink jet head is assembled merely by stacking those individual components in the common direction.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: December 3, 1996
    Assignee: Seiko Precision Inc.
    Inventors: Yukiharu Shimizu, Tsuyoshi Hayakawa, Hiroyuki Kojima, Shoichi Sato, Toshiya Tamura, Takashi Kogo, Hajime Oda
  • Patent number: 5579039
    Abstract: An ink jet recording apparatus wherein recording is effected by ejecting ink to a recording material from a recording head cartridge detachably mountable to a main assembly of the apparatus includes a carriage, movable in a main scan direction, for mounting thereon the recording head cartridge; mounting and demounting mechanism for controlling mounting and demounting of the recording head cartridge on the carriage; a controlling member for controlling operation of the mounting and demounting mechanism to permit mounting or demounting of the recording head cartridge only when the carriage is disposed outside a position where it is faced to the recording material.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: November 26, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Kurata, Yasuo Miyauchi, Takayuki Matsuo
  • Patent number: 5576743
    Abstract: An ink jet recording apparatus comprising: an ink jet recording head for sucking an ink into a pressure chamber and jetting an ink droplet from a nozzle opening by expanding and contracting the pressure chamber by a piezoelectric vibration element; the pressure chamber being formed of a nozzle plate and a vibration plate; and a signal generating device for generating signals. The signals includes a first signal for contracting the piezoelectric vibration element at a predetermined speed to suck the ink into the pressure chamber, a second signal for starting an extension process of the piezoelectric vibration element to splash the ink droplet from the nozzle opening by contracting the pressure chamber, a third signal for interrupting the extension process of the piezoelectric vibration element at least once while the extension process is still being performed and a fourth signal for resuming the extension process of the piezoelectric vibration element again after a predetermined period has elapsed.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: November 19, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Kaoru Momose, Munehide Kanaya, Masahiko Yoshida, Hikonosuke Uwai
  • Patent number: 5574490
    Abstract: A collapsible ink reservoir structure to facilitate assembly of a replaceable or refillable printer ink cartridge is comprised of a relatively rigid inner frame and flexible membranes forming an ink reservoir having side walls which collapse to a substantially flat shape to minimize the amount of ink remaining in the reservoir structure after computer generated printing has depleted the ink from the cartridge. The reservoir structure is a separate unit from the ink discharge aperture device which is assembled and mounted in an outer housing and includes the inner frame and ink bags formed of films to form the cartridge assembly. Multiple reservoirs can be formed within the structure to permit the use of different colorants in each reservoir. The structure preferably contains an ink pressure regulator within each reservoir to maintain a negative pressure therein.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: November 12, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Brian D. Gragg, James E. Clark, David W. Swanson, George T. Kaplinsky, Tofigh Khodapanah
  • Patent number: 5563643
    Abstract: In a printhead assembly, an ink jet printhead is fixed to the wall of an ink supply manifold. The printhead has an ink inlet in communication with a plurality of nozzles, and the manifold contains liquid ink which flows to the printhead inlet through an outlet in the manifold wall. A preformed hot melt adhesive member with a slot therein is positioned between the manifold wall and the printhead with the slot of the adhesive member surrounding the manifold outlet and printhead inlet, so that when the adhesive member is heated and cooled a hermetic seal is formed.
    Type: Grant
    Filed: January 3, 1994
    Date of Patent: October 8, 1996
    Assignee: Xerox Corporation
    Inventors: Michael Carlotta, Vladimir M. Kupchik