Patents by Inventor Hirofumi Koga

Hirofumi Koga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7727697
    Abstract: An electrophotographic toner is disclosed, meeting the requirement that a ratio of a storage modulus at 60° C. [G?(60)] to a storage modulus at 80° C. [G?(80)], G?(60)/G?(80) is from 1×102 to 1×104; a ratio of a storage modulus at 100° C. [G?(100)] to a storage modulus at 120° C. [G?(120)], G?(100)/G?(120) is from 1 to 10; and a storage modulus at a temperature of from 140 to 160° C., [G?(140-160)] is not less than 102 dyn/cm2.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: June 1, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shiro Hirano, Shingo Fujimoto, Takao Yamanouchi, Hirofumi Koga, Masaaki Kondo, Junya Onishi
  • Patent number: 7700253
    Abstract: An electrophotographic toner is disclosed, comprising a binding resin, a colorant and a releasing agent, wherein the releasing agent comprises a first releasing agent component of a monoester compound represented by formula (1) and a second releasing agent component composed of a hydrocarbon compound having a branched chain structure, and the first releasing agent component accounting for 40% to 98% by mass of the total amount of the first and second releasing agent components: R1—COO—R2??(1) wherein R1 and R2 are each independently a hydrocarbon group having 13 to 30 carbon atoms.
    Type: Grant
    Filed: January 22, 2007
    Date of Patent: April 20, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Takao Yamanouchi, Shingo Fujimoto, Makoto Kobayashi, Kazuya Isobe, Hirofumi Koga
  • Patent number: 7682766
    Abstract: In an image forming method in which a toner image, which is visualized via an electrostatic latent image formed on an electrophotographic photoreceptor, employing a developer incorporating toner, is transferred onto a recording material followed by fixing, and any residual toner remaining on the electrophotographic photoreceptor is removed, an image forming method in which an electrophotographic photoreceptor and a toner which satisfy specified requirements are employed and image formation is carried out while feeding a surface energy lowering agent from the developer onto the aforesaid electrophotographic photoreceptor, and an image forming apparatus employing the same.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: March 23, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shingo Fujimoto, Takao Yamanouchi, Hirofumi Koga, Masaaki Kondo, Shiro Hirano, Junya Onishi
  • Publication number: 20080020316
    Abstract: An electrophotographic toner is disclosed, meeting the requirement that a ratio of a storage modulus at 60° C. [G?(60)] to a storage modulus at 80° C. [G?(80)], G?(60)/G?(80) is from 1×102 to 1×104; a ratio of a storage modulus at 100° C. [G?(100)] to a storage modulus at 120° C. [G?(120)], G?(100)/G?(120) is from 1 to 10; and a storage modulus at a temperature of from 140 to 160° C., [G?(140-160)] is not less than 102 dyn/cm2.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 24, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Shiro HIRANO, Shingo FUJIMOTO, Takao YAMANOUCHI, Hirofumi KOGA, Masaaki KONDO, Junya ONISHI
  • Publication number: 20070254233
    Abstract: In an image forming method in which a toner image, which is visualized via an electrostatic latent image formed on an electrophotographic photoreceptor, employing a developer incorporating toner, is transferred onto a recording material followed by fixing, and any residual toner remaining on the electrophotographic photoreceptor is removed, an image forming method in which an electrophotographic photoreceptor and a toner which satisfy specified requirements are employed and image formation is carried out while feeding a surface energy lowering agent from the developer onto the aforesaid electrophotographic photoreceptor, and an image forming apparatus employing the same.
    Type: Application
    Filed: April 18, 2007
    Publication date: November 1, 2007
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Shingo FUJIMOTO, Takao YAMANOUCHI, Hirofumi KOGA, Masaaki KONDO, Shiro HIRANO, Junya ONISHI
  • Publication number: 20070178397
    Abstract: An electrophotographic toner is disclosed, comprising a binding resin, a colorant and a releasing agent, wherein the releasing agent comprises a first releasing agent component of a monoester compound represented by formula (1) and a second releasing agent component composed of a hydrocarbon compound having a branched chain structure, and the first releasing agent component accounting for 40% to 98% by mass of the total amount of the first and second releasing agent components: R1—COO—R2 ??(1) wherein R1 and R2 are each independently a hydrocarbon group having 13 to 30 carbon atoms.
    Type: Application
    Filed: January 22, 2007
    Publication date: August 2, 2007
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Takao YAMANOUCHI, Shingo FUJIMOTO, Makoto KOBAYASHI, Kazuya ISOBE, Hirofumi KOGA
  • Publication number: 20070178399
    Abstract: Disclosed is an electrophotographic image forming method which comprises steps of forming a toner image on an image support, fixing the toner image on the image support in a fixing nip section of a fixing device employing a contact heating system and the toner contains a first releasing agent, a dynamic viscosity of the first releasing agent is 4-20 mm2/sec; and a fixing temperature in the fixing nip section of the fixing device is 75-100° C. higher than a melting point of the first releasing agent.
    Type: Application
    Filed: November 21, 2006
    Publication date: August 2, 2007
    Inventors: Makoto Kobayashi, Shingo Fujimoto, Takao Yamanouchi, Kazuya Isobe, Hirofumi Koga
  • Patent number: 4855612
    Abstract: A switching circuit for supplying electric power to a load from a power source includes a first relay device having a first switch and a semiconductor switching element connected in series with the first switch, power source and load. A second relay device is provided which is defined by a second switch connected parallelly to the semiconductor switching element and an actuating switch for enabling and disabling the semiconductor switching element. The second relay device is so arranged as to effect the make of the actuating switch and second switch in said order and to effect the break of the same in the opposite order. A delay circuit is provided for controlling the first and second relay devices such that when supplying a current to the load, the first and second relay devices are turned on in said order so that the first switch, the actuating switch and the second switch are turned on in said order.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: August 8, 1989
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Hirofumi Koga, Katsumi Koyanagi
  • Patent number: 4831348
    Abstract: This low profile electromagnetic relay includes a base and a support post protruding at one end of the base. An electromagnet assembly is mounted in a generally central position on the base, and has a pair of magnetic pole surfaces on opposite sides of its one end. An armature assembly includes an insulating armature member, shaped generally as a hollow rectangular member with an open space being defined within it and formed with a hole by which it is rotatably fitted over the support post with the electromagnet assembly fitting inside the open space defined within it. A drive portion is connected to the insulating armature member. A pair of mutually opposed armature pieces are mounted on the insulating armature member, and, when the insulating armature member is rotatably fitted over the support post, lie on opposite sides of the one end of the electromagnet assembly and each oppose one of the magnetic pole surfaces of the electromagnet assembly.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: May 16, 1989
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Shunichi Agatahama, Hirofumi Koga, Ryuichi Sato, Hiroyuki Sagawa, Kazushige Matsuoka
  • Patent number: 4814944
    Abstract: In this mounting structure and method for a surface mounted type electronic component, the component has at least one terminal which protrudes from its bottom surface and which terminates in a foot portion for being soldered to a printed circuit board. Also, a projection extends from this bottom surface of the electronic component for a distance somewhat less than the amounty by which the terminal projects from it. This projection is provisionally secured by adhesive to the printed circuit board with the foot portion of the terminal overlaying that circuit portion to which it is to be soldered, and then subsequently this terminal foot portion is soldered to this circuit portion. Thereby, during the soldering process, there is no risk of the terminal foot portion becoming displaced from the circuit portion and thus badly soldered thereto, because of the locating action of the adhered projection.
    Type: Grant
    Filed: July 13, 1988
    Date of Patent: March 21, 1989
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Hiroyuki Sagawa, Hirofumi Koga, Shunichi Agatahama, Hideyuki Okumura, Kazushige Matsuoka, Ryuichi Sato
  • Patent number: 4772809
    Abstract: A switching circuit for supplying electric power to a load from a power source includes a first relay device having a first switch and a semiconductor switching element connected in series with the first switch, power source and load. A second relay device is provided which is defined by a second switch connected parallelly to the semiconductor switching element and an actuating switch for enabling and disabling the semiconductor switching element. The second relay device is so arranged as to effect the make of the actuating switch and second switch in said order and to effect the break of the same in the opposite order. A delay circuit is provided for controlling the first and second relay devices such that when supplying a current to the load, the first and second relay devices are turned on in said order so that the first switch, the actuating switch and the second switch are turned on in said order.
    Type: Grant
    Filed: November 27, 1984
    Date of Patent: September 20, 1988
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Hirofumi Koga, Katsumi Koyanagi
  • Patent number: 4727344
    Abstract: A polarized relay with an electromagnetic drive comprises an electromagnetic yoke composed of a core wound with a coil and a yoke body, and having one end portion of one magnetic polarity and a pair of bifurcated end portions of the other magnetic polarity opposite to the one magnetic polarity. The bifurcated end portions are separated in opposition from each other. The one end portion of the yoke is disposed between the bifurcated end portions so as to cooperate to form a pair of working gaps. A movable block of a substantially C-like configuration incorporating a permanent magnet has two magnetic pole pieces which are disposed within the working gaps, respectively. Guide is provided for guiding the movable block in response to energization and deenergization of the coil so that the pole pieces are movable within the respective working gaps. A contact mechanism including movable contacts is mechanically coupled to the movable block to make or break circuit.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: February 23, 1988
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Hirofumi Koga, Kozo Maenishi, Shuichi Kashimoto, Sueaki Honda, Kenichi Tsuruyoshi, Takezo Sano
  • Patent number: 4626813
    Abstract: A polarized electromagnetic relay apparatus for assembling a coil spool with a terminal carrying base plate is disclosed. The coil spool assembly has a front collar with a projecting piece. The projecting piece is adapted to engage with a latch hole in the terminal carrying base plate. The terminal carrying base plate has jaw-like, offset portions which engage with supporting offset portions formed in the rear collar of the coil spool assembly. The flexible projecting pieces may be of deformable material in order to easily engage with the latch hole of the base plate. The flexible projecting pieces can be tapered, also to facilitate engagement with the base plate latch hole. A terminal holder is formed on the rear collar of the coil spool assembly and is adapted to receive terminals from the coil. The terminal holder comprises the supporting offset portions which engage with the jaw-like offset portions of the base plate. The terminal holder is of a greater thickness than the base plate.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: December 2, 1986
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Hirofumi Koga, Kozo Maenishi, Shuichi Kashimoto, Sueaki Honda, Kenichi Tsuruyoshi, Takezo Sano
  • Patent number: 4272745
    Abstract: A flat pack type electromagnetic relay having a bracket-shaped stationary core and a bracket-shaped armature is disclosed. The core is provided with a spool for an energizing coil and the spool has engaging portions extending from its end flanges. The armature is pivotally supported by the engaging portions to close or open electrical contacts in response to a current applied to the coil.
    Type: Grant
    Filed: June 13, 1979
    Date of Patent: June 9, 1981
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Takashi Tanaka, Hirofumi Koga