Patents by Inventor Toru Yamada

Toru Yamada 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).

  • In-band-flat-group-delay type dielectric filter and linearized amplifier using the same
    Publication number: 20040145432
    Abstract: A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.
    Type: Application
    Filed: January 16, 2004
    Publication date: July 29, 2004
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura, Hiroyuki Nakamatsu
  • Laminated bandpass filter, high frequency radio device and laminated bandpass filter manufacturing method
    Patent number: 6768399
    Abstract: The present invention provides a small and low loss laminated bandpass filter by placing two strip lines 313 and 314 that form a resonator in a certain distance on the same layer and thereby electromagnetically coupling these strip lines.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: July 27, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuhide Uriu, Toru Yamada, Toshio Ishizaki, Tsutomu Matsumura
  • Dielectric laminated device including a buried electric conductive member to form a strip line and its method of manufacture
    Patent number: 6765460
    Abstract: By using a method for manufacturing a dielectric laminated device, an opening is formed on a first dielectric sheet, a strip line and an input and output line including an input and output electrode are formed by burying electrode materials in said opening, the first dielectric sheet is laminated with the second and third dielectric sheets disposed above and below respectively to form a laminate, a first and second shield electrodes and a ground electrode are formed, an end of the strip line is connected to the ground electrode, the first shield electrode and the second shield electrode are mutually connected through the ground electrode, and the input and output electrode is exposed along the line direction of the strip line. By this constitution of the above dielectric laminated device, the mounting reliability of the dielectric laminated device can be further increased.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: July 20, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideaki Nakakubo, Toshio Ishizaki, Toru Yamada, Hiroshi Kagata, Tatsuya Inoue, Shoichi Kitazawa
  • High-frequency filter device, filter device combined to a transmit-receive antenna, and wireless apparatus using the same
    Patent number: 6759916
    Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: July 6, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshio Ishizaki, Toru Yamada
  • High frequency switch and radio communication apparatus with layered body for saw filter mounting
    Patent number: 6750737
    Abstract: A layered body of a SAW filter includes a surface dielectric layer having a surface layer electrode pattern formed thereon, and a first dielectric layer having a pair of electrode patterns and a first ground electrode pattern formed thereon. A pair of balanced output terminals of SAW filters of unbalanced input-balanced output are connected respectively to the pair of electrode patterns via the surface layer electrode pattern, and a part of the first ground electrode pattern is disposed between the pair of the electrode patterns.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: June 15, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuhide Uriu, Keiji Onishi, Toru Yamada, Toshio Ishizaki
  • Surface acoustic wave filter
    Publication number: 20040108918
    Abstract: A longitudinally coupled surface acoustic wave filter includes a first, second and third IDT electrodes and a first and second reflector electrodes on a piezoelectric substrate. The IDT electrodes each include a primary excitation region having &lgr;/2 electrode finger pitches, where &lgr; is the wavelength of a surface acoustic wave. The primary excitation region is phase-shifted by a certain amount in accordance with a desired passband frequency response. The IDT electrodes further include a plurality of secondary excitation regions each having electrode finger pitches different from the &lgr;/2 pitches. All of the electrode finger pitches of the surface acoustic wave filter thus range from 0.8&lgr;/2 to 1.2&lgr;/2, so that a loss increase caused by discontinuity between the IDT electrodes is prevented.
    Type: Application
    Filed: August 11, 2003
    Publication date: June 10, 2004
    Inventors: Akio Tsunekawa, Shunichi Seki, Shinobu Nakaya, Hiroyuki Nakamura, Toru Yamada
  • Dielectric filter, antenna duplexer, and communications appliance
    Patent number: 6747528
    Abstract: A dielectric filter including a plurality of resonators, and at least one transmissions line provided among said plurality of resonators. A band rejection characteristic is formed around a resonance frequency of said resonator, and a line length of said transmission line is shorter than ¼ of a wavelength corresponding to the resonance frequency of said resonator.
    Type: Grant
    Filed: January 8, 2003
    Date of Patent: June 8, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomoya Maekawa, Hiroshi Kushitani, Hiroshi Shigemura, Toru Yamada, Toshio Ishizaki, Hideaki Nakakubo
  • Surface acoustic wave filter and communications apparatus using the same
    Patent number: 6710683
    Abstract: A surface acoustic wave filter has a piezoelectric substrate and at least two interdigital transducer electrodes on the piezoelectric substrate, wherein at least one of the interdigital transducer electrodes includes a unidirectional electrode and bidirectional electrode, and the length &lgr;d of a basic cell of the unidirectional electrode is longer than the length &lgr;s of a basic cell of the bidirectional electrode.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: March 23, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Nakamura, Toru Yamada, Kazunori Nishimura, Tsutomu Igaki, Shigeru Tsuzuki, Ken Matsunami, Toshio Ishizaki
  • Dielectric filter
    Patent number: 6707353
    Abstract: In order to prevent filter characteristics from being deteriorated due to generation of a spurious pulse is unnecessary resonance at a high level in a passing band at the frequency in a microwave region used in a portable telephone system or the like, at least two types of dielectric resonators having different frequency characteristics in unnecessary harmonic modes except for a main mode near the passing band of a filter are arranged in spaces partitioned by partition walls in a shielding unit constituted by a metal case and a lid, so that a dielectric filter which can obtain preferable spurious suppressing characteristics.
    Type: Grant
    Filed: September 14, 2001
    Date of Patent: March 16, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Akira Enokihara, Minoru Tachibana, Toshiaki Nakamura
  • Laminated dielectric filter, and antenna duplexer and communication equipment using the same
    Publication number: 20040041660
    Abstract: A laminated dielectric filter is formed by coupling a plurality of resonators to one another by electromagnetic-field coupling. In the laminated dielectric filter, a bypass circuit formed of a series circuit including bypass capacitors and transmission lines is provided in parallel to a magnetic-field bypass coupling between non-adjacent resonators. Thus, capacitance of the bypass capacitors can be regulated without being affected by the magnetic-field bypass coupling between the non-adjacent resonators. As a result, attenuation poles outside a passband can be controlled freely.
    Type: Application
    Filed: September 4, 2003
    Publication date: March 4, 2004
    Inventors: Emiko Kawahara, Toru Yamada, Hiroshi Kushitani, Hideaki Nakakubo
  • Dielectric filter
    Publication number: 20040036557
    Abstract: To provide a strong input/output coupling while preventing a Q-value from deteriorating.
    Type: Application
    Filed: August 21, 2003
    Publication date: February 26, 2004
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura
  • Laminated dielectric filter, and antenna duplexer and communication equipment using the same
    Patent number: 6696903
    Abstract: A laminated dielectric filter is formed by coupling a plurality of resonators to one another by electromagnetic-field coupling. In the laminated dielectric filter, a bypass circuit formed of a series circuit including bypass capacitors and transmission lines is provided in parallel to a magnetic-field bypass coupling between non-adjacent resonators. Thus, capacitance of the bypass capacitors can be regulated without being affected by the magnetic-field bypass coupling between the non-adjacent resonators. As a result, attenuation poles outside a passband can be controlled freely.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: February 24, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Emiko Kawahara, Toru Yamada, Hiroshi Kushitani, Hideaki Nakakubo
  • Method and apparatus of making optical fiber
    Publication number: 20040025541
    Abstract: In method of making an optical fiber and an apparatus, an optical fiber coated with UV curable resin is drawn at a drawing speed of 1000 m/min or more so that the optical fiber 5 has predetermined coating diameter from 235 &mgr;m to 265 &mgr;m. A transit time from an exit of a UV curing furnace to an entrance portion of a capstan for pulling the optical fiber downstream is set to be 0.5 seconds or more.
    Type: Application
    Filed: May 16, 2003
    Publication date: February 12, 2004
    Inventors: Toru Yamada, Masaharu Oe
  • Information receiver and information transmission and reception method providing information usage status
    Patent number: 6691310
    Abstract: An information receiver comprising a unit receiving information having a package number identifying the information, a first storage section where said package number is stored, a second storage section where reception information indicating whether or not said information associated with said package number was received, and a third storage section where display information indicating whether or not said information associated with said package number was displayed.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: February 10, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Shigeki Hirasawa, Yuichi Yagawa, Eiichi Yukino, Michio Morioka, Toru Yamada, Nobukage Takahashi
  • Surface-acoustic-wave filter providing outputs with different delay times and communications unit
    Patent number: 6683515
    Abstract: A surface-acoustic-wave filter has a piezoelectric substrate; and a plurality of transversal surface-acoustic-wave (SAW) filters set on the piezoelectric substrate and respectively having at least two inter-digital transducer (IDT) electrodes for transcieving surface acoustic waves, characterized in that periods for surface acoustic waves to propagate from inputs to outputs of the SAW filters differ in the SAW filters and thereby, timings of outputs from the SAW filters are different from each other.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: January 27, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Nakamura, Kenji Monma, Toru Yamada, Kazunori Nishimura
  • High-frequency switch, laminated high-frequency switch, high-frequency radio unit, and high-frequency switching method
    Publication number: 20030214367
    Abstract: A high-frequency switch has
    Type: Application
    Filed: June 17, 2003
    Publication date: November 20, 2003
    Inventors: Kazuhide Uriu, Toru Yamada, Tomoyuki Iwasaki
  • Surface acoustic wave filter and communication apparatus with the same
    Patent number: 6650206
    Abstract: A surface acoustic wave filter, has: a piezoelectric substrate; and a at least two filter tracks having at least an input interdigital transducer electrode and an output interdigital transducer electrode provided on said piezoelectric substrate, wherein the respective input interdigital transducer electrodes of said at least two filter tracks are brought into connection in parallel; the respective output interdigital transducer electrodes of said at least two filter tracks are brought into connection in parallel, and overlapping widths of electrode fingers of said input interdigital transducer electrode and output interdigital transducer electrode are different from each other for each of said at least two filter tracks.
    Type: Grant
    Filed: September 13, 2001
    Date of Patent: November 18, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Nakamura, Toru Yamada, Shigeru Tsuzuki, Kazunori Nishimura
  • 3-frequency branching circuit, branching circuit, and radio communication device
    Publication number: 20030189910
    Abstract: A 3-frequency branching circuit in the past could not be used for a system wherein a TDMA method such as GSM and DCS and a W-CDMA method such as UMTS are mixed. The 3-frequency branching circuit equipped with branching means having first and second internal terminals 21 and 22, an antenna terminal 20 of connecting to an antenna, a low-pass filter connected between the first internal terminal 21 and the antenna terminal 20, and a high-pass filter connected between the second internal terminal 22 and the antenna terminal 20, a switching circuit 1 of switching between GSMTX and GSMRX, a switching circuit 2 of switching between DCS TX, DCS RX and a third internal terminal 23, and a duplexer connected to the third internal terminal 23.
    Type: Application
    Filed: June 4, 2003
    Publication date: October 9, 2003
    Inventors: Toru Yamada, Tsutomu Matsumura, Toshio Ishizaki, Hiroyuki Nakamura, Kazuhide Uriu
  • High-frequency filter device, filter device combined to a transmit-receive antenna, and wireless apparatus using the same
    Publication number: 20030184402
    Abstract: A high-frequency filter device includes at least one filter to be connected to a high-frequency stage of a wireless apparatus. The filter includes a voltage-controlled variable frequency resonance element which is made of a resonance element and a voltage-controlled variable impedance element electrically connected to the resonance element. The high-frequency filter device includes a control section for controlling a voltage applied to the variable impedance element, and a signal monitoring section for outputting a control signal, with which the voltage is controlled, to the control section based on frequency data as to an oscillating frequency of a local oscillator of the wireless apparatus. The signal monitoring section controls a band frequency of the at least one filter based on the frequency data in such a manner that the band frequency is adaptively changed.
    Type: Application
    Filed: March 25, 2003
    Publication date: October 2, 2003
    Inventors: Toshio Ishizaki, Toru Yamada
  • Silver halide photographic lightsensitive material
    Patent number: 6610466
    Abstract: A silver halide photographic lightsensitive material comprising at least one silver halide photographic emulsion layer containing a silver halide photographic emulsion prepared by mixing a dispersion of silver halide grains, the silver halide grains exhibiting such spectral absorption maximum wavelength and light absorption intensity that, when the spectral absorption maximum wavelength is less than 500 nm, the light absorption intensity is 60 or more, while when the spectral absorption maximum wavelength is 500 nm or more, the light absorption intensity is 100 or more, with an emulsified dispersion, wherein the silver halide photographic emulsion, when agitated at 40° C. for 30 min, exhibits a variation of absorption spectrum integrated intensity ranging from 400 nm to 700 nm of 10% or less.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: August 26, 2003
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masami Sakurada, Kiyoshi Morimoto, Fumitaka Ueda, Toru Yamada