Patents by Inventor Nobuo Takahashi

Nobuo Takahashi 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: 6584112
    Abstract: An exchange connects terminal equipment each having terminal identifier information. A layer 3 control unit of the exchange generates a pseudo layer 3 global reception call; and a layer 2 control unit of the exchange terminates the global reception call at the terminal equipment, extracts before link establishment the terminal identifier information of the terminal equipment from a logical link establishment request frame sent from the terminal equipment in response to the termination, and notifies the terminal identifier information to the layer 3 control unit. The layer 3 layer control unit holds the terminal identifier information notified for subsequent termination of calls to the terminal equipment. By this means, matched terminal identifier information is maintained between the exchange and subscriber terminal equipment.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: June 24, 2003
    Assignee: Fujitsu Limited
    Inventor: Nobuo Takahashi
  • Publication number: 20030076008
    Abstract: A ceramic element including a main actuator element 26 having an anti-ferroelectric film 22 and a pair of electrodes 24a, 24b formed on a first principal surface (front surface) of the anti-ferroelectric film 22, a vibrating section 18 for supporting the main actuator element 26, and a fixed section 20 for supporting the vibrating section 18 in a vibrating manner. The anti-ferroelectric film 22 after polarization has a region Zt in which its average dielectric constant is increased in an analog manner in accordance with a voltage V applied to the pair of electrodes 24a, 24b. Specifically, an expression of p/t≦2.5 is satisfied provided that an average film thickness of the anti-ferroelectric film 22 is t, and a pitch between the pair of electrodes 24a, 24b is p.
    Type: Application
    Filed: October 7, 2002
    Publication date: April 24, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Toshikatsu Kashiwaya, Nobuo Takahashi
  • Patent number: 6533197
    Abstract: A device for discharging raw material-fuel includes a pressurizing means for discharging a liquid, a pressure application room (1) in fluid communication with a discharge nozzle, and a liquid discharge nozzle (2) positioned under the pressure application room to discharge the liquid. The nozzle portion has an aspect ratio (L/d) of 5 or more, with L being the length of the nozzle in the thickness direction of the nozzle portion and d being the diameter of the nozzle portion.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: March 18, 2003
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Nobuo Takahashi
  • Publication number: 20030041457
    Abstract: An optical switch disposed in intermediate positions of optical paths to define a channel of a light signal constitutes a cell member in whose interior cells are formed and a waveguide member having fine slits; and a gas is filled in cells of which side walls are formed by piezoelectric/electrostrictive elements or antiferroelectric elements, a liquid is filled in the fine slits, and the cells and the fine slits are communicated to each other via a communicating hole; optical waveguides intersect at the fine slits, and the cells are disposed at the crossing locations, and said side walls are expanded/constricted by applying an electric field to the piezoelectric/electrostrictive elements or antiferroelectric elements which form the side walls of the cells, and a part of the gas stored in each cell is ejected at a corresponding intersection area from said communicating hole into the corresponding fine slit.
    Type: Application
    Filed: October 4, 2002
    Publication date: March 6, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi
  • Publication number: 20030020370
    Abstract: A piezoelectric/electrostrictive actuator comprising a plurality of piezoelectric/electrostrictive elements arranged in alignment like teeth of a comb on a base plate and being driven by means of dislocation of piezoelectric/electrostrictive elements. The cell driving type actuator is characterized in that each of cells is formed independently from its adjacent cells by closing respective planes facing the base plate and being positioned between two adjacent piezoelectric/electrostrictive elements with respective cover plates. Thus, there is provided a piezoelectric/electrostrictive actuator; wherein a heating process at a high temperature can be applied, mass production at low cost is possible; the actuator includes cells with slit portions having a width of 60 &mgr;m or less and a high aspect ratio, the cells can be activated with high electric field strength, and great displacement can be obtained with small electric field strength.
    Type: Application
    Filed: April 5, 2002
    Publication date: January 30, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi
  • Publication number: 20030011284
    Abstract: A ceramic element including a main actuator element 26 having an anti-ferroelectric film 22 and a pair of electrodes 24a, 24b formed on a first principal surface (front surface) of the anti-ferroelectric film 22, a vibrating section 18 for supporting the main actuator element 26, and a fixed section 20 for supporting the vibrating section 18 in a vibrating manner. The anti-ferroelectric film 22 after polarization has a region Zt in which its average dielectric constant is increased in an analog manner in accordance with a voltage V applied to the pair of electrodes 24a, 24b. Specifically, an expression of p/t≦2.5 is satisfied provided that an average film thickness of the anti-ferroelectric film 22 is t, and a pitch between the pair of electrodes 24a, 24b is p.
    Type: Application
    Filed: August 22, 2002
    Publication date: January 16, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Toshikatsu Kashiwaya, Nobuo Takahashi
  • Patent number: 6507682
    Abstract: An optical switch disposed in intermediate positions of optical paths to define a channel of a light signal constitutes a cell member in whose interior cells are formed and a waveguide member having fine slits; and a gas is filled in cells of which side walls are formed by piezoelectric/electrostrictive elements or antiferroelectric elements, a liquid is filled in the fine slits, and the cells and the fine slits are communicated to each other via a communicating hole; optical waveguides intersect at the fine slits, and the cells are disposed at the crossing locations, and said side walls are expanded/constricted by applying an electric field to the piezoelectric/electrostrictive elements or antiferroelectric elements which form the side walls of the cells, and a part of the gas stored in each cell is ejected at a corresponding intersection area from said communicating hole into the corresponding fine slit.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: January 14, 2003
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi
  • Publication number: 20030001454
    Abstract: A piezoelectric/electrostrictive actuator in which a plurality of piezoelectric/electrostrictive elements each consisting of a piezoelectric/electrostrictive body and at least one pair of electrodes are formed on a thick ceramic substrate, said actuator being activated by the displacement of said piezoelectric/electrostrictive bodies, is provided. The piezoelectric/electrostrictive elements are joined to said ceramic substrate into respective unified bodies, and are two-dimensionally arranged independently of each other. The piezoelectric/electrostrictive actuator ensures providing a greater displacement with a lower voltage, a high responsive speed, and a greater generating force, as well as enhancing the mounting ability and the integration as well as a method for manufacturing such a actuator can be provided.
    Type: Application
    Filed: December 5, 2001
    Publication date: January 2, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi, Koji Kimura
  • Publication number: 20020195902
    Abstract: A piezoelectric/electrostrictive actuator wherein a plurality of piezoelectric/electrostrictive elements are arranged like teeth of a comb in alignment on a base plate, said actuator being driven by the displacement of said piezoelectric/electrostrictive elements. A cell formed by closed a plane facing said base plate and being positioned between two adjacent piezoelectric/electrostrictive elements with a cover plate is formed in such a manner that it is independent of its adjacent cells. Activation with a higher field strength is possible, and a greater displacement can be realized with a weaker field strength.
    Type: Application
    Filed: June 22, 2001
    Publication date: December 26, 2002
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Nobuo Takahashi
  • Patent number: 6495945
    Abstract: A ceramic substrate 1 comprises a thin diaphragm portion 3 and a thick portion 2. A lower electrode 4 is formed on the ceramic substrate and is spaced apart from an auxiliary electrode 8, also formed on the ceramic substrate. A bonding layer 7C comprises an insulator and is formed on the ceramic substrate between the lower and auxiliary electrodes. A piezoelectric/electrostrictive layer 5 is formed on at least a portion of each of the lower electrode, the auxiliary electrode and the bonding layer. An upper electrode 6 extends over the piezoelectric/electrostrictive layer and contacts the auxiliary electrode. A bonded portion exists wherein the bonding layer serves to completely bond together the substrate and the piezoelectric/electrostrictive film layer.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: December 17, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Hirofumi Yamaguchi, Nobuo Takahashi
  • Publication number: 20020186682
    Abstract: A method used for establishing an optimized path between two endpoints in a transmission network including subnetworks is provided. In the method, two endpoints and route selection elements are specified, a first route search is performed to search for route candidates each of which connects subnetworks by using data on network resources according to the route selection elements, and the route candidates is stored in a dynamic routing table. Then, at least a route candidate is selected as a selected route candidate according to the route selection elements, and a second route search is performed to search for a route connecting network elements in each subnetwork on the selected route candidate.
    Type: Application
    Filed: September 24, 2001
    Publication date: December 12, 2002
    Inventors: Satoshi Kawano, Hidekazu Nakajima, Yoichi Azuma, Mitsumaro Kimura, Nobuo Takahashi
  • Patent number: 6485275
    Abstract: A device for discharging a liquid raw material(fuel) is provided, including a structure for discharging liquid having at least a pressurizing means for discharging liquid, a pressure chamber, a flow path communicating with the pressure chamber, and an air bubble trap cell communicating with the pressure chamber via the flow path. According to this device, a trapped air bubble can be securely released.
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: November 26, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Nobuo Takahashi
  • Publication number: 20020168132
    Abstract: Directed to an optical switch being disposed in intermediate positions of optical paths to define a channel of a light signal: being constituted of a cell member in whose interior cells are formed and a waveguide member having fine slits; and a gas is filled in cells of which side walls are formed by piezoelectric/electrostrictive elements or antiferroelectric elements, a liquid is filled in the fine slits, and the cells and the fine slits are communicated to each other via a communicating hole; optical waveguides intersect at the fine slits, and the cells are disposed at the crossing locations, and said side walls are expanded/constricted by applying an electric field to the piezoelectric/electrostrictive elements or antiferroelectric elements which form the side walls of the cells, and a part of the gas stored in each cell is ejected at a corresponding intersection area from said communicating hole into the corresponding fine slit: the optical switch thus produced being able to suppresses an increase in the
    Type: Application
    Filed: July 25, 2001
    Publication date: November 14, 2002
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi
  • Patent number: 6476540
    Abstract: A ceramic element comprises a main actuator element 26 having an anti-ferroelectric film 22 and a pair of electrodes 24a, 24b formed on a first principal surface (front surface) of the anti-ferroelectric film 22, a vibrating section 18 for supporting the main actuator element 26, and a fixed section 20 for supporting the vibrating section 18 in a vibrating manner. The anti-ferroelectric film 22 after polarization has a region Zt in which its average dielectric constant is increased in an analog manner in accordance with a voltage V applied to the pair of electrodes 24a, 24b. Specifically, an expression of p/t≦2.5 is satisfied provided that an average film thickness of the anti-ferroelectric film 22 is t, and a pitch between the pair of electrodes 24a, 24b is p.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: November 5, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Toshikatsu Kashiwaya, Nobuo Takahashi
  • Patent number: 6465190
    Abstract: Disclosed is a method comprising a pretreatment step of forming a poly-L-lysine layer on a surface of a base plate, a sample preparation step of preparing a sample containing a DNA fragment, a dilution step of diluting the concentration of the obtained sample, and a supply step of supplying a diluted sample solution onto the base plate to produce a DNA chip. The sample preparation step includes an amplification step of PCR-amplifying the DNA fragment to prepare a PCR product, a powder formation step of drying the obtained PCR product to form DNA powder, and a mixing step of dissolving the obtained DNA powder in a buffer solution.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: October 15, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Toshikazu Hirota, Nobuo Takahashi, Yukihisa Takeuchi, Takao Ohnishi
  • Publication number: 20020146330
    Abstract: A micro pump having at least one pump member for conveying a fluid by action of pressure is provided; the pump member comprising a pump unit, and the pump unit being formed by at least one actuator member for generating a pressure fluctuation and a fluid channel member in which a fluid flows, and the actuator member provided with a cell formed by disposing two side walls made of piezoelectric/electrostrictive elements or antiferrodielectric elements on a connecting plate, and covering surface facing the connecting plate between said side walls with a cover plate; and the actuator member selectively forms a fluid channel and generates pressure fluctuation in the fluid channel member due to displacement of the cell caused by expansion/contraction of the side wall: present micro pump being small and thin in size, with attainment of increasing fluid ejection amount(move amount), and high speed in response.
    Type: Application
    Filed: August 22, 2001
    Publication date: October 10, 2002
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi
  • Publication number: 20020146329
    Abstract: A micro pump member, in which a plurality of cells formed in a base part is used as pressurizing chambers, and side walls forming said pressurizing chambers are constructed by piezoelectric/electrostrictive elements, and the volume of said pressurizing chambers is changed by the displacement of said piezoelectric/electrostrictive elements to produce a pressure in the pressurizing chambers. Said pressurizing chambers are formed to be independent of the adjacent pressurizing chambers. Activation can be carried out by applying a driving electric field having a high field strength to the pressuring chambers, so that a greater displacement and a higher response can be obtained with a smaller field strength.
    Type: Application
    Filed: July 6, 2001
    Publication date: October 10, 2002
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi
  • Publication number: 20020140318
    Abstract: A piezoelectric/electrostrictive actuator in which a plurality of piezoelectric/electrostrictive elements each consisting of a piezoelectric/electrostrictive body and at least one pair of electrodes are formed on a thick ceramic substrate, said actuator being activated by the displacement of said piezoelectric/electrostrictive bodies, is provided. The piezoelectric/electrostrictive elements are joined to said ceramic substrate into respective unified bodies, and are two-dimensionally arranged independently of each other. The piezoelectric/electrostrictive actuator ensures providing a greater displacement with a lower voltage, a high responsive speed, and a greater generating force, as well as enhancing the mounting ability and the integration as well as a method for manufacturing such a actuator can be provided.
    Type: Application
    Filed: September 12, 2001
    Publication date: October 3, 2002
    Applicant: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Hiroyuki Tsuji, Kazumasa Kitamura, Nobuo Takahashi, Koji Kimura
  • Patent number: 6448623
    Abstract: A lower electrode 4 of a substrate 1 is continuously formed from a thin diaphragm portion 3 to a thick region 2, and independently of the lower electrode 4, an auxiliary electrode 8 is formed on the thick region 2 of the substrate 1, whereby a piezoelectric/electrostrictive film 5 is formed across the lower electrode 4 and the auxiliary electrode 8. An incomplete bonding portion of the piezoelectric/electrostrictive film 5 to the substrate 1 is eliminated on the thin diaphragm portion 3, thereby making it possible to reduce significantly a variation in vibration form.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: September 10, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Nobuo Takahashi, Mutsumi Kitagawa, Hirofumi Yamaguchi
  • Patent number: 6440174
    Abstract: A piezo-electric/electrostrictive film type chip (50) includes: a ceramic substrate (70) having a spacer plate (74) having a windows-disposed pattern (100) having a plurality of window portions (75) and a thin closure plate (72) for closing the window portions (75) which is unitarily connected with the spacer plate; and a piezo-electric/electrostrictive working portion (71) having a lower electrode (81), a piezo-electric/electrostrictive layer (82), and an upper electrode (83), each being formed in the form of a layer and laminated in this order at a closure portion of the window (75) on the outer surface of the closure plate (72) by a film formation method. A pin hole (52) for positioning is formed in or near the center of gravity of the windows-disposed pattern (100).
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: August 27, 2002
    Assignees: Seiko Epson Corporation, NGK Insulators, Ltd.
    Inventors: Minoru Usui, Takahiro Katakura, Fujio Akahane, Kazumi Kamoi, Satoshi Shinada, Yukihisa Takeuchi, Nobuo Takahashi