Patents by Inventor Takumi Yamaga

Takumi Yamaga 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: 7768001
    Abstract: An off-current is reduced in an organic transistor, with which an organic transistor array is formed. A display apparatus is constructed using the organic transistor array. The organic transistor includes a substrate, a gate electrode, a separating electrode, a gate insulating film, a source electrode, a drain electrode, and an organic semiconductor layer. The organic transistor has a region in which the separating electrode and the organic semiconductor layer are laminated. A power supply is connected to the separating electrode.
    Type: Grant
    Filed: June 9, 2008
    Date of Patent: August 3, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Takumi Yamaga, Ikue Kawashima, Yoshinobu Nakayama
  • Publication number: 20090321727
    Abstract: An organic transistor array includes gate electrodes provided on a substrate, source and drain electrodes provided above or below the gate electrodes via a gate insulator layer, and an organic semiconductor layer opposing the gate electrodes via the gate insulator layer, and forming a channel region between mutually adjacent source and drain electrodes. The organic transistor array in a plan view is sectioned into sections each forming a single pixel, and each section has a closest packed structure.
    Type: Application
    Filed: June 24, 2009
    Publication date: December 31, 2009
    Applicant: RICOH COMPANY, LTD.
    Inventors: Keiichiro YUTANI, Takumi YAMAGA, Atsushi ONODERA
  • Publication number: 20090272966
    Abstract: An organic transistor is disclosed that has an organic semiconductor layer patterned with high resolution. The organic transistor includes a gate electrode, a gate insulting film, a source electrode, a drain electrode, and an organic semiconductor layer formed of an organic semiconductor material. The gate electrode, the gate insulting film, the source electrode, the drain electrode, and the organic semiconductor layer are formed on a substrate. At least one of the source electrode and the drain electrode has an opening.
    Type: Application
    Filed: July 19, 2007
    Publication date: November 5, 2009
    Inventors: Takumi Yamaga, Ikue Kawashima, Yoshikazu Akiyama
  • Publication number: 20090206329
    Abstract: To provide an organic thin film transistor including a pair of electrodes for allowing a current to flow through an organic semiconductor layer made of an organic semiconductor material, and a third electrode, wherein the organic semiconductor material is composed mainly of an arylamine polymer having a weight-average molecular weight (Mw) of 20,000 or more.
    Type: Application
    Filed: February 15, 2006
    Publication date: August 20, 2009
    Inventors: Takumi Yamaga, Toshiya Sagisaka
  • Publication number: 20090189148
    Abstract: A transistor element that a transistor using an organic semiconductor layer on a substrate, an insulating film between layers contacting the organic semiconductor layer and an upper electrode electrically contacting the transistor via a through hole provided in the insulating film between layers are layered, wherein the insulating film between layers comprises a mixture of organic materials and particles.
    Type: Application
    Filed: September 28, 2006
    Publication date: July 30, 2009
    Inventors: Mayuka Araumi, Ikue Kawashima, Akishige Murakami, Takumi Yamaga
  • Patent number: 7550554
    Abstract: An aryl amine polymer is provided which contains a specific repeat unit, its use in preparing an organic semiconductor material which contains the aryl amine polymer and an additional specific compound and in the preparation of organic light emitting devices (OLED), organic thin film transistors (TFT) and so on, along with an organic TFT including a substrate, an organic semiconductor layer which contains the organic semiconductor material and is located overlying the substrate, an electrode pair of a source electrode and a drain electrode; and a third electrode.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: June 23, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiya Sagisaka, Masaomi Sasaki, Masafumi Torii, Shinichi Kawamura, Takashi Okada, Yoshinobu Nakayama, Yoshikazu Akiyama, Hitoshi Kondoh, Hidenori Tomono, Takumi Yamaga
  • Publication number: 20090095958
    Abstract: A thin film transistor array is disclosed. The thin film transistor array includes plural gate electrodes formed on an insulation substrate, plural source electrodes formed above or under the gate electrodes via a gate insulation film so that the source electrodes cross the gate electrodes in a planar view, plural drain electrodes formed at corresponding positions surrounded by the gate electrodes and the source electrodes in a planar view in the same layer as that of the source electrodes, semiconductor layers formed via the gate insulation film to face the gate electrodes for forming corresponding channel regions between the source electrodes and the drain electrodes. The plural gate electrodes are linearly formed, and the channel regions are disposed to face the gate electrodes.
    Type: Application
    Filed: October 6, 2008
    Publication date: April 16, 2009
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takao INOUE, Takumi YAMAGA, Atsushi ONODERA
  • Publication number: 20090050879
    Abstract: An organic thin film transistor is disclosed. The organic thin film transistor includes a substrate, a gate electrode , a gate insulating film , a source electrode on the gate insulating film, a drain electrode on the gate insulating film at an interval with the source electrode, and an organic semiconductor layer. The gate insulating film includes an electrode formation region having surface energy modified by energy deposition, one or more corners of the electrode formation region has an obtuse-angled shape, and the source electrode and/or the drain electrode is formed in the electrode formation region so as to have substantially the same corner shape as the electrode formation region having the obtuse-angled shaped corners.
    Type: Application
    Filed: May 9, 2006
    Publication date: February 26, 2009
    Inventors: Takumi Yamaga, Hidenori Tomono, Ikue Kawashima
  • Publication number: 20090014715
    Abstract: An off-current is reduced in an organic transistor, with which an organic transistor array is formed. A display apparatus is constructed using the organic transistor array. The organic transistor includes a substrate, a gate electrode, a separating electrode, a gate insulating film, a source electrode, a drain electrode, and an organic semiconductor layer. The organic transistor has a region in which the separating electrode and the organic semiconductor layer are laminated. A power supply is connected to the separating electrode.
    Type: Application
    Filed: June 9, 2008
    Publication date: January 15, 2009
    Inventors: Takumi YAMAGA, Ikue Kawashima, Yoshinobu Nakayama
  • Publication number: 20090014716
    Abstract: A disclosed organic thin-film transistor includes a gate electrode formed on a substrate, a gate insulation film formed on the gate electrode, a source electrode and a drain electrode formed, with a gap inbetween, at least over the gate electrode on which the gate insulation film is formed, an organic semiconductor layer formed in a region including the gap, an interlayer insulation film formed to cover the organic semiconductor layer, and a conductive layer formed on the interlayer insulation film and connected to the drain electrode. A part of the organic semiconductor layer is formed on the interlayer insulation film.
    Type: Application
    Filed: June 23, 2008
    Publication date: January 15, 2009
    Inventors: Takumi YAMAGA, Mayuka Araumi
  • Publication number: 20080029766
    Abstract: A disclosed laminated structure includes a wettability-variable layer containing a wettability-variable material whose surface energy changes when energy is applied thereto and including at least a high-surface-energy area having high surface energy and a low-surface-energy area having low surface energy; and a conductive layer formed on the high-surface-energy area. The high-surface-energy area includes a first area and a second area extending from the first area and having a width smaller than that of the first area.
    Type: Application
    Filed: August 1, 2007
    Publication date: February 7, 2008
    Inventors: Atsushi Onodera, Hidenori Tomono, Koei Suzuki, Takanori Tano, Takumi Yamaga
  • Publication number: 20070092760
    Abstract: An aryl amine polymer is provided which contains a specific repeat unit, its use in preparing an organic semiconductor material which contains the aryl amine polymer and an additional specific compound and in the preparation of organic light emitting devices (OLED), organic thin film transistors (TFT) and so on, along with an organic TFT including a substrate, an organic semiconductor layer which contains the organic semiconductor material and is located overlying the substrate, an electrode pair of a source electrode and a drain electrode; and a third electrode.
    Type: Application
    Filed: December 5, 2006
    Publication date: April 26, 2007
    Inventors: Toshiya Sagisaka, Masaomi Sasaki, Masafumi Torii, Shinichi Kawamura, Takashi Okada, Yoshinobu Nakayama, Yoshikazu Akiyama, Hitoshi Kondoh, Hidenori Tomono, Takumi Yamaga
  • Publication number: 20070054212
    Abstract: A method of manufacturing an organic transistor active substrate is disclosed. The organic transistor active substrate includes an organic transistor in which a first electrode is formed on a substrate, a first insulating film is formed on the first electrode, a pair of second electrodes is formed on the first insulating film, and an active layer made of an organic semiconductor material is formed on the pair of second electrodes. The organic transistor is laminated with a second insulating film, and the second insulating film is laminated with a third electrode which is electrically coupled to one of the second electrodes via a through-hole provided through the second insulating film. The first electrode is formed by inkjet ejection; the first insulating film is formed by coating; the pair of second electrodes is formed by inkjet ejection; the active layer is formed by inkjet ejection; the second insulating film is formed by screen printing; and the third electrode is formed by screen printing.
    Type: Application
    Filed: September 7, 2006
    Publication date: March 8, 2007
    Inventors: Yoshikazu Akiyama, Takumi Yamaga, Takanori Tano, Hidenori Tomono, Akishige Murakami, Hitoshi Arita, Mayuka Araumi
  • Publication number: 20070048637
    Abstract: An arylamine polymer containing a repeating unit represented by the following chemical structure (I): In the chemical structure, Ar1, Ar3, and Ar4 independently represent a substituted or non-substituted divalent aromatic hydrocarbon group, Ar2 represents a substituted or non-substituted univalent aromatic hydrocarbon group, R1 and R2 independently represent a hydrogen atom, a substituted or non-substituted alkyl group, a substituted or non-substituted alkoxy group or a substituted or non-substituted alkylthio group, x and y independently represent an integer of from 0 to 2, and n represents 0 or 1.
    Type: Application
    Filed: August 30, 2006
    Publication date: March 1, 2007
    Inventors: Takashi Okada, Masaomi Sasaki, Masafumi Torii, Shinichi Kawamura, Toshiya Sagisaka, Yoshikazu Akiyama, Takumi Yamaga
  • Patent number: 7166689
    Abstract: An aryl amine polymer is provided which contains a specific repeat unit, its use in preparing an organic semiconductor material which contains the aryl amine polymer and an additional specific compound and in the preparation of organic light emitting devices (OLED), organic thin film transistors (TFT) and so on, along with an organic TFT including a substrate, an organic semiconductor layer which contains the organic semiconductor material and is located overlying the substrate, an electrode pair of a source electrode and a drain electrode; and a third electrode.
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: January 23, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiya Sagisaka, Masaomi Sasaki, Masafumi Torii, Shinichi Kawamura, Takashi Okada, Yoshinobu Nakayama, Yoshikazu Akiyama, Hitoshi Kondoh, Hidenori Tomono, Takumi Yamaga
  • Publication number: 20040212042
    Abstract: An aryl amine polymer is provided which contains a specific repeat unit, its use in preparing an organic semiconductor material which contains the aryl amine polymer and an additional specific compound and in the preparation of organic light emitting devices (OLED), organic thin film transistors (TFT) and so on, along with an organic TFT including a substrate, an organic semiconductor layer which contains the organic semiconductor material and is located overlying the substrate, an electrode pair of a source electrode and a drain electrode; and a third electrode.
    Type: Application
    Filed: February 13, 2004
    Publication date: October 28, 2004
    Inventors: Toshiya Sagisaka, Masaomi Sasaki, Masafumi Torii, Shinichi Kawamura, Takashi Okada, Yoshinobu Nakayama, Yoshikazu Akiyama, Hitoshi Kondoh, Hidenori Tomono, Takumi Yamaga