Patents by Inventor Shoichi Minagawa

Shoichi Minagawa 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).

  • Surface acoustic wave convolver with depletion layer control
    Patent number: 4473767
    Abstract: A surface acoustic wave convolver comprises a piezoelectric substrate on which a plurality of conductive strip electrodes, an input signal transducer and a reference signal transducer are formed, and a semiconductive substrate on which depletion layer control electrodes and capacitance read-out electrodes are formed. The conductive strip electrodes are connected to the depletion layer control electrodes so that an output signal is taken up from the capacitance read-out electrodes.
    Type: Grant
    Filed: November 2, 1982
    Date of Patent: September 25, 1984
    Assignee: Clarion Co., Ltd.
    Inventors: Shoichi Minagawa, Takamasa Sakai, Takeshi Okamoto
  • Surface acoustic wave parametric device
    Patent number: 4471255
    Abstract: An surface acoustic wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which comprises a laminate in combination with a semiconductor, and an electrode provided in a surface signal wave propagation path between said input and output means for supplying pumping power.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: September 11, 1984
    Assignee: Clarion Co., Ltd.
    Inventors: Nobuo Mikoshiba, Shoichi Minagawa
  • Surface acoustic wave device
    Patent number: 4456847
    Abstract: A surface acoustic wave device comprises a lower electrode provided on an elastic substrate, a piezoelectric film covering the lower electrode and an upper electrode provided on the piezoelectric film. The device is characterized in that the upper electrode comprises first and second double electrodes both opposed to the lower electrode.
    Type: Grant
    Filed: June 1, 1983
    Date of Patent: June 26, 1984
    Assignee: Clarion Company, Ltd.
    Inventors: Shoichi Minagawa, Takeshi Okamoto, Teruo Niitsuma
  • Surface elastic wave element
    Patent number: 4449107
    Abstract: A surface elastic wave element comprising a (110)-oriented silicon substrate, a zinc oxide layer formed on the silicon substrate and electrodes formed on the zinc oxide layer so as to propagate surface elastic wave to the [001]-axis direction of the zinc oxide layer.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: May 15, 1984
    Assignee: Clarion Co., Ltd.
    Inventors: Ryuichi Asai, Takeshi Okamoto, Shoichi Minagawa
  • Sputtering apparatus
    Patent number: 4412906
    Abstract: A sputtering apparatus includes a target and a substrate holder respectively supported in a lower portion and an upper portion of a vacuum chamber, a gas jet opening located near the upper surface of the target, and gas withdrawal conduits located near the substrate holder, so that by supplying a gas to the vacuum chamber through the gas jet opening, the gas pressure in the chamber gradually decreases from the region near the target to the region near the substrate holder.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: November 1, 1983
    Assignee: Clarion Co., Ltd.
    Inventors: Yasuhiko Sato, Takamasa Sakai, Shoichi Minagawa
  • Surface acoustic wave device and method for producing the same
    Patent number: 4403202
    Abstract: A surface acoustic wave device wherein a laminated structure comprised of a piezoelectric member and a metal electrode or electrodes is provided on a surface acoustic wave surface of an elastic body and an acoustic impedance discontinuous face is formed on the elastic body, so that a longitudinal wave generated by the laminated structure is reflected by the acoustic impedance discontinuous face to provide a transverse wave.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: September 6, 1983
    Assignee: Clarion Co., Ltd.
    Inventor: Shoichi Minagawa
  • Surface-acoustic-wave parametric device
    Patent number: 4398114
    Abstract: A surface-acoustic-wave parametric device includes in that a plurality of pumping electrodes arranged along a propagation path of surface acoustic wave. Values of DC bias voltages to be applied to the respective pumping electrodes for forming parametric interaction regions, or values of pumping voltages to be applied to the pumping electrodes, are differentiated so as to correspond to a desired frequency characteristic.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: August 9, 1983
    Assignee: Clarion Co., Ltd.
    Inventors: Shoichi Minagawa, Takeshi Okamoto
  • Surface-acoustic-wave device
    Patent number: 4365216
    Abstract: A surface-acoustic-wave device wherein a plurality of metal strips (S) are provided on a propagation path of surface acoustic wave which is formed in a laminate comprised of a piezoelectric layer (23) and a semiconductor (1), the metal strips are extended onto the semiconductor outside the propagation path of surface acoustic wave, and depletion layer capacitance non-linearity created on the semiconductor surface at a region where the metal strips are extended is used as a main factor of a parametric interaction.
    Type: Grant
    Filed: January 7, 1981
    Date of Patent: December 21, 1982
    Assignee: Clarion Co., Ltd.
    Inventors: Shoichi Minagawa, Takeshi Okamoto, Takamasa Sakai
  • Surface-acoustic-wave device
    Patent number: 4357553
    Abstract: A surface-acoustic-wave device has a laminate formed of a semiconductor and a piezoelectric layer and a depletion layer control means locally provided at an interface portion of the semiconductor and said piezoelectric layer, wherein a parametric interaction is caused at a region other than an area where the depletion layer control means is provided and a depletion layer capacitance is controlled by applying a DC bias voltage and a pumping voltage to the depletion layer control means.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: November 2, 1982
    Assignee: Clarion Co., Ltd.
    Inventors: Shoichi Minagawa, Takamasa Sakai, Takeshi Okamoto, Morihiro Niimi
  • Surface-acoustic-wave parametric device
    Patent number: 4348650
    Abstract: A surface-acoustic-wave parametric device characterized in that a width of a parametric interaction region in a direction perpendicular to the propagation direction of surface acoustic wave is varied so as to correspond to a desired frequency characteristic.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: September 7, 1982
    Assignee: Clarion Co., Ltd.
    Inventors: Shoichi Minagawa, Takeshi Okamoto
  • Elastic surface wave device
    Patent number: 4334167
    Abstract: An elastic surface wave device having an input electrode, a pump electrode and an output electrode provided on a body of the device. The output electrode is juxtaposed with the input electrode on the body of the device on the same side with reference to the pump electrode and a multistrip coupler is provided between the pump electrode and the input and output electrodes so as to output, through the output electrode, a backward wave signal from the pump electrode.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: June 8, 1982
    Assignee: Clarion Co., Ltd.
    Inventors: Shoichi Minagawa, Takeshi Okamoto
  • Frequency selector apparatus
    Patent number: 4288765
    Abstract: A frequency selector apparatus which effects a frequency selection by providing at least one reflecting electrode at a position adjacent elastic surface wave transducer or transducers provided in an acoustic wave propagation track in a piezoelectric medium so as to reflect a frequency component selected by a parametric interaction with an a.c. electrical signal applied to said reflecting electrode.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: September 8, 1981
    Assignee: Clarion Co., Ltd.
    Inventors: Nobuo Mikoshiba, Shoichi Minagawa
  • Frequency selector apparatus
    Patent number: 4254388
    Abstract: A frequency selector apparatus wherein unidirectional input and output surface-acoustic-wave transducers are provided in an acoustic wave propagation path formed on a piezoelectric device and reflecting electrodes, to which a.c. signals are applied respectively, are disposed in the acoustic wave propagation path on opposite sides of the transducers and adjacent thereto.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: March 3, 1981
    Assignee: Clarion Co., Ltd.
    Inventors: Nobuo Mikoshiba, Shoichi Minagawa, Takeshi Okamoto
  • Elastic surface wave device
    Patent number: 4233530
    Abstract: An elastic surface wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which composes a laminate in combination with a semiconductor, and an electrode provided in a surface signal wave propagation path between said input and output means for application of a d.c. bias voltage and supply of a pumping power.
    Type: Grant
    Filed: October 5, 1978
    Date of Patent: November 11, 1980
    Assignee: Clarion Co., Ltd.
    Inventors: Nobuo Mikoshiba, Shoichi Minagawa