Patents by Inventor Naoto Horiguchi

Naoto Horiguchi 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).

  • Publication number: 20050087819
    Abstract: A semiconductor device is provided, which aims to reduce the standby power thereof by reducing the leak between a body and a drain with restraining the effect on a threshold voltage, in order to actualize the highly reliable semiconductor device. When extension regions are formed, an n-type impurity less diffusive than phosphorus (P+), for example, arsenic (As+) is used as an impurity. In addition to ordinary ion implantation with high dose (high concentration) and low acceleration energy, As+ ions are implanted with low dose and high acceleration energy.
    Type: Application
    Filed: March 23, 2004
    Publication date: April 28, 2005
    Applicant: FUJITSU LIMITED
    Inventor: Naoto Horiguchi
  • Patent number: 6828629
    Abstract: A P-type pocket layer is formed in the surficial portion of a semiconductor substrate, a sidewall insulating film having a thickness of as thin as 10 nm or around is formed, and P is implanted therethrough to thereby form an N-type extension layer in the surficial portion of the p-type pocket layer. Then, a sidewall insulating film is formed, and P is implanted to thereby form an N-type source and a drain diffusion layer. P, having a larger coefficient of diffusion than that of conventionally-used As, used in the formation of the pocket layer can successfully moderate a strong electric field in the vicinity of the channel, and can consequently reduce leakage current between the drain and the semiconductor substrate and thereby reduce the off-leakage current, even if the gate length is reduced to 100 nm or shorter.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: December 7, 2004
    Assignee: Fujitsu Limited
    Inventor: Naoto Horiguchi
  • Patent number: 6815759
    Abstract: A tunneling insulating film is formed on the partial surface area of a semiconductor substrate. A floating gate electrode is formed on the tunneling insulating film. A gate insulating film covers the side wall of the floating gate electrode and a partial surface area of the semiconductor substrate on both sides of the floating gate electrode. A first control gate electrode is disposed on the gate insulating film over the side wall of the floating gate electrode and over a partial surface area of the semiconductor substrate on both sides of the floating gate electrode. A pair of impurity doped regions is formed in a surface layer of the semiconductor substrate on both sides of a gate structure including the floating gate structure and first control gate structure.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: November 9, 2004
    Assignee: Fujitsu Limited
    Inventors: Naoto Horiguchi, Tatsuya Usuki, Kenichi Goto
  • Publication number: 20040169222
    Abstract: A P-type pocket layer is formed in the surficial portion of a semiconductor substrate, a sidewall insulating film having a thickness of as thin as 10 nm or around is formed, and P is implanted therethrough to thereby form an N-type extension layer in the surficial portion of the p-type pocket layer. Then, a sidewall insulating film is formed, and P is implanted to thereby form an N-type source and a drain diffusion layer. P, having a larger coefficient of diffusion than that of conventionally-used As, used in the formation of the pocket layer can successfully moderate a strong electric field in the vicinity of the channel, and can consequently reduce leakage current between the drain and the semiconductor substrate and thereby reduce the off-leakage current, even if the gate length is reduced to 100 nm or shorter.
    Type: Application
    Filed: February 2, 2004
    Publication date: September 2, 2004
    Applicant: FUJITSU LIMITED
    Inventor: Naoto Horiguchi
  • Patent number: 6774430
    Abstract: A non-volatile semiconductor memory comprising a semiconductor substrate, a gate insulating film formed on the substrate, and having a thin central section and thick end sections, a floating gate formed on the rate insulating film, an inter-electrode insulating film formed on the floating gate, a control gate formed on the inter-electrode insulating film, and source/drain regions formed in the substrate on both sides of the floating sate and having extensions extending under the thick end sections of the floating gate, and separated from the thin central section of the gate insulating film, wherein the thin central section enables tunneling of carriers at a low applied voltage, and thick end sections prevent tunneling of stored charges to the extensions and enhance retention of the stored charges.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: August 10, 2004
    Assignee: Fujitsu Limited
    Inventors: Naoto Horiguchi, Toshiro Futatsugi
  • Patent number: 6541788
    Abstract: A method and device for converting light from a first wavelength to a second wavelength. The method comprises the steps of exciting an electron in a quantum dot with an incident infrared photon having the first wavelength, the excited electron having a first energy, tunneling the excited electron through a barrier into a stress induced quantum dot, and recombining the excited electron with a hole in the stress induced quantum dot, therein producing a photon having the second wavelength, typically in the visible range.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: April 1, 2003
    Assignee: The Regents of the University of California
    Inventors: Pierre M. Petroff, Naoto Horiguchi
  • Patent number: 6479112
    Abstract: A glass panel, its manufacturing method and a spacer for use in the glass panel. In the glass panel, a plurality of spacers (3) are formed between and along a first opposing face (2A) of a first glass sheet (1A) and a second opposing face (2B) of a second glass sheet (1B) so as to form a space (C) therebetween, and a sealing material (6) is provided at peripheral edge (1a) of the first glass sheet (1A) and the second glass sheet (1B) for maintaining the space (C) gas-tight. The plurality of such spacers (3) having, at one side thereof, contact portions (5) capable of coming into contact with the first opposing face (2A) are provided on the second opposing face (2B). The contact portions (5) and the first opposing face (2A) are movable relative to each other.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: November 12, 2002
    Assignee: Nippon Sheet Glass Co., Ltd.
    Inventors: Kyoichi Shukuri, Hideo Yoshizawa, Naoto Horiguchi, Osamu Asano, Keiichiro Okajima, Tomonori Miura
  • Patent number: 6462374
    Abstract: To provide a semiconductor device which can retain information for a long period of time even in a case that the tunnel insulation film is thin. A semiconductor device comprises a first insulation film 14 formed on a semiconductor substrate 10, a floating gate electrode 22 formed on the first insulation film, a second insulation 24 film formed on the floating gate electrode, and a control gate electrode 26 formed on the second insulation film. A depletion layer is formed in the floating gate electrode near the first insulation film in a state that no voltage is applied between the floating gate electrode and the semiconductor substrate.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: October 8, 2002
    Assignee: Fujitsu Limited
    Inventors: Tatsuya Usuki, Naoto Horiguchi
  • Publication number: 20020110653
    Abstract: A glass panel including a pair of first and second glass sheets (1A, 1B) disposed with sheet faces thereof opposed to each other, a plurality of spacers (5) being interposed between the pair of glass sheets (1A, 1B) for forming a space (4) therebetween; and a sealing material (S) for bonding peripheral edges (3) of the glass sheets (1A, 1B) together for sealing the space (4), the sealing material having a lower fusing temperature than the softening point of the glass sheets (1A, 1B). Each spacer (5) is formed by disposing spacer-forming paste (11) in a predetermined shape on the sheet face of the glass sheet (1A, 1B). Or, the spacer (5) comprises a plurality of spacer bodies (51) two-dimensionally interconnected to each other via a connecting member (52).
    Type: Application
    Filed: February 11, 2002
    Publication date: August 15, 2002
    Inventors: Kyoichi Shukuri, Hideo Yoshizawa, Naoto Horiguchi, Osamu Asano, Keiichiro Okajima, Tomonori Miura, Masao Misonou, Seiichiro Honjo
  • Publication number: 20020079533
    Abstract: A semiconductor memory device manufacturing method includes the steps of (a) forming a stack of a first gate insulating layer, a floating gate electrode layer, an inter-electrode insulating layer, and a control electrode layer on a semiconductor substrate; (b) patterning the stack using a mask and thereby creating a gate electrode pattern; (c) causing a chemical reaction for the gate electrode pattern from both sides thereof and increasing thereby the thickness of the gate insulating layer at the end sections; and (d) implanting ions of impurity in the active regions on both sides of the gate electrode pattern and forming thereby first source/drain regions respectively extending into regions respectively below the end sections of the gate insulating layer. In the semiconductor memory device, a tunnel oxide film can be thinned and reduction in retention time of memory information can be prevented.
    Type: Application
    Filed: October 29, 2001
    Publication date: June 27, 2002
    Applicant: Fujitsu Limited
    Inventors: Naoto Horiguchi, Toshiro Futatsugi
  • Patent number: 6387460
    Abstract: A glass panel including a pair of first and second glass sheets (1A, 1B) disposed with sheet faces thereof opposed to each other, a plurality of spacers (5) being interposed between the pair of glass sheets (1A, 1B) for forming a space (4) therebetween; and a sealing material (S) for bonding peripheral edges (3) of the glass sheets (1A, 1B) together for sealing the space (4), the sealing material having a lower fusing temperature than the softening point of the glass sheets (1A, 1B). Each spacer (5) is formed by disposing spacer-forming paste (11) in a predetermined shape on the sheet face of the glass sheet (1A, 1B). Or, the spacer (5) comprises a plurality of spacer bodies (51) two-dimensionally interconnected to each other via a connecting member (52).
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: May 14, 2002
    Assignee: Nippon Sheet Glass Co., Ltd.
    Inventors: Kyoichi Shukuri, Hideo Yoshizawa, Naoto Horiguchi, Osamu Asano, Keiichiro Okajima, Tomonori Miura, Masao Misonou, Seiichiro Honjo
  • Patent number: 6351410
    Abstract: A ferromagnetic tunnel junction random access memory includes a ferromagnetic tunnel junction structure including a first ferromagnetic layer, a second ferromagnetic layer disposed adjacent to the first ferromagnetic layer and having a fixed magnetization, and a tunnel insulator layer interposed between the first and second ferromagnetic layers; a conductor plug penetrating the first ferromagnetic layer, the tunnel insulator layer and the second ferromagnetic layer along a center axis; a first selection line coupled to a first end of the conductor plug; and a second selection line coupled to a second end of the conductor plug opposite to the first end. The first ferromagnetic layer has a generally ring shape surrounding the conductor plug and is insulated from the conductor plug. One of the first and second ferromagnetic layers has an antiferromagnetic layer pattern on a portion thereof.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: February 26, 2002
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Nakao, Yoshimi Yamashita, Naoto Horiguchi
  • Publication number: 20020003255
    Abstract: To provide a semiconductor device which can retain information for a long period of time even in a case that the tunnel insulation film is thin. A semiconductor device comprises a first insulation film 14 formed on a semiconductor substrate 10, a floating gate electrode 22 formed on the first insulation film, a second insulation 24 film formed on the floating gate electrode, and a control gate electrode 26 formed on the second insulation film. A depletion layer is formed in the floating gate electrode near the first insulation film in a state that no voltage is applied between the floating gate electrode and the semiconductor substrate.
    Type: Application
    Filed: March 22, 2001
    Publication date: January 10, 2002
    Applicant: Fujitsu Limited
    Inventors: Tatsuya Usuki, Naoto Horiguchi
  • Publication number: 20010002712
    Abstract: A tunneling insulating film is formed on the partial surface area of a semiconductor substrate. A floating gate electrode is formed on the tunneling insulating film. A gate insulating film covers the side wall of the floating gate electrode and a partial surface area of the semiconductor substrate on both sides of the floating gate electrode. A first control gate electrode is disposed on the gate insulating film over the side wall of the floating gate electrode and over a partial surface area of the semiconductor substrate on both sides of the floating gate electrode. A pair of impurity doped regions is formed in a surface layer of the semiconductor substrate on both sides of a gate structure including the floating gate structure and first control gate structure.
    Type: Application
    Filed: December 1, 2000
    Publication date: June 7, 2001
    Inventors: Naoto Horiguchi, Tatsuya Usuki, Kenichi Goto
  • Patent number: 6210763
    Abstract: In a double glazing including a pair of glass sheets 1, a plurality of spacers 2 disposed between opposed sheet faces of the glass sheets 1 by a predetermined pitch, and a sealing member 4 interposed between the glass sheets 1 along the entire peripheries thereof, with a space V between the glass sheets being sealed in a vacuum condition, each spacer 2 is formed so as to maintain a predetermined distance between the glass sheets when subjected to a static normal external pressure normally applied thereto in the direction of sheet thickness and also to relieve stress through plastic deformation when subjected to an impact dynamically applied in the sheet thickness direction.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: April 3, 2001
    Assignee: Nippon Sheet Glass Co., LTD
    Inventors: Hidemi Katoh, Naoto Horiguchi, Masao Misonou
  • Patent number: 6054349
    Abstract: A single-electron device includes a substrate, an insulating film provided on the substrate, a plurality of nanometer-size conductive particles formed in the insulating film along an interface between the substrate and the insulating film, and an electrode provided on the insulating film, wherein the conductive particles have a generally identical size and arranged substantially in a plane at a depth closer to the substrate.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: April 25, 2000
    Assignee: Fujitsu Limited
    Inventors: Anri Nakajima, Naoto Horiguchi, Hiroshi Nakao
  • Patent number: 5936258
    Abstract: A wavelength-domain-multiplication memory comprises a first semiconductor layer including a first conductivity type impurity, a carrier barrier semiconductor layer formed on the first semiconductor layer, and quantum dots formed in the carrier barrier semiconductor layer.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: August 10, 1999
    Assignee: Fujitsu Limited
    Inventors: Kenichi Imamura, Shun-ichi Muto, Naoto Horiguchi, Yoshihiro Sugiyama, Yoshiaki Nakata
  • Patent number: 5734174
    Abstract: A photo hole burning memory device includes a quantum dot and a quantum well layer cooperating with the quantum dot for storing information and a periodic structure that creates a photonic bandgap, wherein the periodic structure includes a local irregularity that forms a level in the photonic bandgap.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: March 31, 1998
    Assignee: Fujitsu Limited
    Inventor: Naoto Horiguchi
  • Patent number: 5203051
    Abstract: A grommet for automatic insertion into a mounting hole in a panel by a robot including a head portion 1 having a longitudinal bore for receiving a screw through its center, a bottom portion 3 including a stepped portion 7 elastically engaging the robot arm located within the longitudinal bore; and locking claws 4 attached to the grommet which reflect during insertion of the grommet into the mounting hole and then spring snap into engagement when the locking claws 4 clear the mounting hole, such that the force required to disengage the robot arm 5 from the stepped portion 7 is less than the force required to extract the grommet from the panel, which enables the robot to easily determine whether or not the grommet is accurately inserted into the mounting hole.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: April 20, 1993
    Assignee: K.K. Aoyama Seisakusho
    Inventors: Sunao Tonami, Naoto Horiguchi, Sotoaki Yamamoto, Hiroshi Kazino, Masaaki Ide, Hideki Kakamu, Tomiyasu Kakeno