Patents by Inventor Daisuke Okumura

Daisuke Okumura 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: 20100102217
    Abstract: The length of the collision cell (20) in the direction along the ion optical axis (C) is set to be within the range between 40 and 80 mm, and typically 51 mm, which is remarkably shorter than before. The CID gas is supplied so that it flows in the direction opposite to the ion's traveling direction. Since the energy that an ion receives in colliding with a CID gas increases, it is possible to practically and sufficiently ensure the CID efficiency even though the collision cell (20) is short. In addition, since the passage distance for an ion is short, the passage time is shortened. Accordingly, it is possible to avoid the degradation in the detection sensitivity and the generation of a ghost peak due to the delay of the ion.
    Type: Application
    Filed: August 24, 2007
    Publication date: April 29, 2010
    Inventors: Daisuke Okumura, Hiroto Itoi, Kazuo Mukaibatake
  • Publication number: 20100096541
    Abstract: An electrode member (11, 12) having two electrode plain plate portions (21) and one circular portion (20) is created from a single metal plate, where the two electrode plain plate portions (21) belong to every other virtual rod electrode around the ion optical axis and face across the ion optical axis, and the circular portion (20) electrically connects these two electrode plain plate portions (21). A predetermined number of resin electric holders (13) each holding the electrode member (11, 12) are stacked in the ion optical axis direction, with every other electric member rotated by 90° around the ion optical axis, to form a virtual quadrupole rod type ion guide. Since this configuration reduces the number of components more than ever before and saves a cable for connecting electrode plain plate portions (21, 25) to which the same voltage should be applied, it is possible to reduce the cost and facilitate assembly and regulation in manufacturing and use.
    Type: Application
    Filed: March 23, 2007
    Publication date: April 22, 2010
    Applicant: SHIMADZU CORPORATION
    Inventors: Daisuke Okumura, Hiroto Itoi
  • Publication number: 20100012836
    Abstract: The direct current bias voltage to be applied to the pre-filter 13 provided in the previous stage of the quadrupole mass filter 14 for selecting an ion according to the mass-to-charge ratio is changed in accordance with the mass-to-charge ratio of the target ion to be allowed to pass through, in order that the time period required for an ion to pass through the pre-filter 13 is uniformed regardless of the mass-to-charge ratio, and simultaneously the phase of the oscillation of ions at the entrance of the quadrupole mass filter 14 is also uniformed. In the range where the mass-to-charge ratio is larger than some degree, the ion's oscillation itself is small, and in addition, the ion's passage efficiency deteriorates rather than enhances, due to the potential barrier created by the voltage difference from the direct current bias voltage applied to the quadrupole mass filter 14.
    Type: Application
    Filed: October 11, 2006
    Publication date: January 21, 2010
    Applicant: Shimadzu Corporation
    Inventors: Kazuo Mukaibatake, Daisuke Okumura
  • Publication number: 20100012835
    Abstract: The inside of the collision cell 20 placed in the analysis chamber 10 which is vacuum-evacuated is partitioned into an anterior chamber 23 and a posterior chamber 24 by the partition wall 21 with a communicating aperture 22. The former is used as a dissociation area A1 and the latter as a convergence area A2. Electrodes 27 and 28 for forming a radio-frequency electric field are placed in the chambers 23 and 24, respectively. When a CID gas is supplied into the anterior chamber 23, the CID gas is dispersed inside the anterior chamber 23 and flows into the analysis chamber 10 via the posterior chamber 24. Consequently, the gas pressure in the posterior chamber becomes higher than the gas pressure in the analysis chamber 10, and the gas pressure in the anterior chamber 23 becomes higher than the gas pressure in the posterior chamber 24.
    Type: Application
    Filed: October 11, 2006
    Publication date: January 21, 2010
    Applicant: Shimadzu Corporation
    Inventors: Daisuke Okumura, Hiroto Itoi, Kazuo Mukaibatake, Kazuo Miyoshi
  • Patent number: 7227131
    Abstract: A time of flight type mass spectrometer (TOF-MS) of the present invention includes: a flight space containing a loop orbit on which ions fly once or more than once; a flight controller for making ions of a same mass to charge ratio fly the loop orbit at several values of number of turns; a flight time measurer for measuring a length of flight time of the ions; and a processor for determining the mass to charge ratio of the ions based on a relationship between the value of number of turns and the length of flight time of the ions. The speed of ions flying a loop orbit depends on their mass to charge ratios. For ions of the same mass to charge ratio, the difference between the lengths of flight time of the ions flying the loop orbit N turns and of the ions flying the loop orbit N+1 turns depends on the speed of the ions, so that the difference depends on the mass to charge ratio of the ions.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: June 5, 2007
    Assignees: Shimadzu Corporation, Osaka University
    Inventors: Shinichi Yamaguchi, Morio Ishihara, Michisato Toyoda, Daisuke Okumura
  • Patent number: 7211792
    Abstract: In the mass spectrometer of the present invention, a flight space is provided before the mass analyzer, and the flight space includes a loop orbit on which ions fly repeatedly. While ions fly on the loop orbit repeatedly, ion selecting electrodes placed on the loop orbit selects object ions having a specific mass to charge ratio in such a manner that, for a limited time period when the object ions are flying through the ion selecting electrodes, an appropriate voltage is applied to the ion selecting electrodes to make them continue to fly on the loop orbit, but otherwise to make or let other ions deflect from the loop orbit. If ions having various mass to charge ratios are introduced in the loop orbit almost at the same time, the object ions having the same mass to charge ratio continue to fly on the loop orbit in a band, but ions having mass to charge ratios different from that are separated from the object ions while flying on the loop orbit repeatedly.
    Type: Grant
    Filed: January 11, 2005
    Date of Patent: May 1, 2007
    Assignee: Shimadzu Corporation
    Inventors: Shinichi Yamaguchi, Morio Ishihara, Michisato Toyoda, Daisuke Okumura
  • Patent number: 7148473
    Abstract: In a time of flight mass spectrometer (TOF-MS) of the present invention, a flight controller makes ions fly a loop orbit a predetermined number of turns, and an ion detector detects the ions at each turn of the flight. A flight time measurer measures the length of flight time of ions of a same mass to charge ratio at every turn, and a data processor constructs a spectrum of flight time. The data processor further computes the Fourier transformation of the spectrum, and determines the mass to charge ratio of the ions based on a frequency peak appearing in the Fourier transformation.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: December 12, 2006
    Assignees: Shimadzu Corporation, Osaka University
    Inventors: Shinichi Yamaguchi, Morio Ishihara, Michisato Toyoda, Daisuke Okumura
  • Publication number: 20050194528
    Abstract: A time of flight type mass spectrometer (TOF-MS) of the present invention includes: a flight space containing a loop orbit on which ions fly once or more than once; a flight controller for making ions of a same mass to charge ratio fly the loop orbit at several values of number of turns; a flight time measurer for measuring a length of flight time of the ions; and a processor for determining the mass to charge ratio of the ions based on a relationship between the value of number of turns and the length of flight time of the ions. The speed of ions flying a loop orbit depends on their mass to charge ratios. For ions of the same mass to charge ratio, the difference between the lengths of flight time of the ions flying the loop orbit N turns and of the ions flying the loop orbit N+1 turns depends on the speed of the ions, so that the difference depends on the mass to charge ratio of the ions.
    Type: Application
    Filed: August 31, 2004
    Publication date: September 8, 2005
    Inventors: Shinichi Yamaguchi, Morio Ishihara, Michisato Toyoda, Daisuke Okumura
  • Publication number: 20050151076
    Abstract: In the mass spectrometer of the present invention, a flight space is provided before the mass analyzer, and the flight space includes a loop orbit on which ions fly repeatedly. While ions fly on the loop orbit repeatedly, ion selecting electrodes placed on the loop orbit selects object ions having a specific mass to charge ratio in such a manner that, for a limited time period when the object ions are flying through the ion selecting electrodes, an appropriate voltage is applied to the ion selecting electrodes to make them continue to fly on the loop orbit, but otherwise to make or let other ions deflect from the loop orbit. If ions having various mass to charge ratios are introduced in the loop orbit almost at the same time, the object ions having the same mass to charge ratio continue to fly on the loop orbit in a band, but ions having mass to charge ratios different from that are separated from the object ions while flying on the loop orbit repeatedly.
    Type: Application
    Filed: January 11, 2005
    Publication date: July 14, 2005
    Applicant: Shimadzu Corporation
    Inventors: Shinichi Yamaguchi, Morio Ishihara, Michisato Toyoda, Daisuke Okumura
  • Publication number: 20050045817
    Abstract: In a time of flight mass spectrometer (TOF-MS) of the present invention, a flight controller makes ions fly a loop orbit a predetermined number of turns, and an ion detector detects the ions at each turn of the flight. A flight time measurer measures the length of flight time of ions of a same mass to charge ratio at every turn, and a data processor constructs a spectrum of flight time. The data processor further computes the Fourier transformation of the spectrum, and determines the mass to charge ratio of the ions based on a frequency peak appearing in the Fourier transformation.
    Type: Application
    Filed: August 31, 2004
    Publication date: March 3, 2005
    Inventors: Shinichi Yamaguchi, Morio Ishihara, Michisato Toyoda, Daisuke Okumura
  • Patent number: 6040521
    Abstract: Transparent conductive ZnO films are formed at a high rate, are equal in performance to those formed by MOCVD and have a large area, while the influence of sputtering bombardment is reduced. A method for producing transparent conductive ZnO films is used to produce the window layer of a CIGS thin-film solar cell. A first conductive film functioning as an interface-protective film is formed on a high-resistance-buffer (interfacial) layer by low-output (100 W or lower) RF sputtering using a ZnO target while reducing sputtering bombardment. Second and third conductive films for the window layer are then formed by DC magnetron sputtering in steps using a ZnO--Al target in each step.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: March 21, 2000
    Assignee: Showa Shell Sekiyu K.K.
    Inventors: Katsumi Kushiya, Daisuke Okumura, Ichiro Sugiyama