Daisuke Okumura
Daisuke Okumura, Kyoto-Shi JP
Patent application number | Description | Published |
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20100012835 | MS/MS MASS SPECTROMETER - The inside of the collision cell | 01-21-2010 |
20100012836 | QUADRUPOLE MASS SPECTROMETER - The direct current bias voltage to be applied to the pre-filter | 01-21-2010 |
20100096541 | MASS SPECTROMETER - An electrode member ( | 04-22-2010 |
20100102217 | MS/MS MASS SPECTROMETER - The length of the collision cell ( | 04-29-2010 |
20100116979 | MASS SPECTROMETER - One virtual rod electrode is composed by a plurality of electrode plain plates arranged in the ion optical axis direction, and four virtual rod electrodes are arranged around the ion optical axis to form a virtual quadrupole rod type ion transport optical system ( | 05-13-2010 |
20100171035 | MASS SPECTROMETER - A radio-frequency ion guide ( | 07-08-2010 |
20110006203 | MS/MS MASS SPECTROMETER - During a halt period of time when the introduction of ions is temporarily discontinued to change an objective ion to be selected by a first mass separator in the previous stage, a pulsed voltage having a polarity opposite to that of the ions remaining in a collision cell ( | 01-13-2011 |
20110240851 | MASS SPECTROMETER - A radio-frequency ion guide ( | 10-06-2011 |
Daisuke Okumura, Nagaokakyo-Shi, Kyoto JP
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20100288922 | MS/MS MASS SPECTROMETER - The gas conductance on the ion injection side of a collision cell is made larger than the gas conductance on the ion exit side by providing two ion injection apertures | 11-18-2010 |
Daisuke Okumura, Nagaokakyo-Shi JP
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20110284740 | MS/MS Mass Spectrometer - A mass analysis of a standard sample having a known mass-to-charge ratio is carried out by performing a mass scan at a first-stage quadrupole ( | 11-24-2011 |
20120205536 | MS/MS MASS SPECTROMETER - The gas conductance on the ion injection side of a collision cell is made larger than the gas conductance on the ion exit side by providing two ion injection apertures | 08-16-2012 |
20130214146 | MS/MS Mass Spectrometer - A mass analysis of a sample having a known mass-to-charge ratio is carried out by performing a scan at a first-stage quadrupole over a predetermined mass range, under the condition that a collision induced dissociation gas is introduced into a collision cell and a voltage applied to a third-stage quadrupole is set so that no substantial mass separation occurs in this quadrupole. Various product ions originating from a precursor ion selected by the first-stage quadrupole arrive at and are detected by a detector without being mass separated. Accordingly, based on the detection data, a data processor can obtain a relationship between the voltage applied to the first-stage quadrupole and the mass-to-charge ratio of the selected ions, with a time delay in the collision cell reflected in that relationship. This relationship is stored in a calibration data memory, to be utilized in a neutral loss scan measurement or the like. | 08-22-2013 |
Daisuke Okumura, Kyoto JP
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20130334415 | TRIPLE QUADRUPOLE MASS SPECTROMETER - A high-quality mass spectrum is provided with alleviated mass/charge axis deviation in a triple quadrupole mass spectrometer even when executing a high-speed mass scan with MS/MS analysis. Mass calibration tables which denote relations between m/z and a mass deviation value which scan speed is a parameter are prepared separately for use in MS analyses without involving dissociation operations and MS/MS analyses with involving dissociation operations. According to a measuring mode, such as a product ion scan measurement or a neutral loss scan measurement, when performing MS/MS analysis, a mass deviation value for the minimum scan speed in a table is used for a quadrupole where the selected m/z is fixed, and a mass deviation value for a designated scan speed in a table is used for a quadrupole where the mass scan is performed, thus controlling the operations of each of a pre-stage and a post-stage quadrupoles. | 12-19-2013 |
20140103206 | ATMOSPHERIC PRESSURE IONIZATION MASS SPECTROMETER - In a first-stage intermediate vacuum chamber, cluster ions causing a background noise are dominantly formed in area (A), while fragment ions are dominantly generated in area (B). Taking this fact into account, when no in-source CID analysis is performed, voltages applied to the first-stage plate electrode of an ion guide and the exit end of a desolvation tube are adjusted to create an accelerating electric field only in area (A) without creating such a field in area (B). Meanwhile, voltages applied to the electrodes of the ion guide are adjusted to create an electric field for separating ions according to their mobility and selecting a specific ion. Such an operation suppresses the cluster-ion formation, removes ions which originate from impurities and have mass-to-charge ratios close to or equal to those of the ions originating from a target substance, and suppresses the fragment-ion generation. As a result, the target ions are detected with high S/N. | 04-17-2014 |
20140361163 | MASS SPECTROMETER AND METHOD OF DRIVING ION GUIDE - A method of operating an electrode changeover switch which switches the connection state of electrodes, the electrode changeover switch is provided in the wiring path between eight electrodes through, arranged rotation-symmetrically about ion optical axis, and voltage generation switch which generates square wave high voltage ±V. When switch is switched as shown in the drawing, two circumferentially adjacent rod electrodes are connected to form one set, a square wave voltage of opposite phase is applied to circumferentially adjacent sets, and an effectively quadrupole electric field is formed. When switch is switched, a square wave voltage of opposite phase is applied to circumferentially adjacent rod electrodes and an octupole electric field is formed. In this way, by switching the switch according to the mass range, etc., it becomes possible to rapidly switch the number of poles of a multipole electric field and to suitably transport ions. | 12-11-2014 |
Daisuke Okumura, Shimamotocyo-Mishimagun JP
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20130284918 | ION GUIDE AND MASS SPECTROMETER - A curved ion guide ( | 10-31-2013 |
Daisuke Okumura, Nagaoka-Shi JP
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20130255775 | WIDE BAND GAP PHOTOVOLTAIC DEVICE AND PROCESS OF MANUFACTURE - A wide band gap, heterojunction photovoltaic material comprises a bulk layer, a high-resistivity layer and a microcrystalline silicon carbide layer. The heterojunction semiconductor material is formed by heating a single-piece semiconductor material to form a high-resistivity layer over a bulk layer, the high-resistivity layer having SiC seed crystals at the top surface. A layer of SiC is sputtered over the high-resistivity layer, and the structure is annealed. The annealing and the SiC seed crystals causes the sputtered SiC layer to convert into a microcrystalline β-SiC layer. When the layer of SiC is sputtered using a p-type SiC target, a p-type SiC layer is formed over the high-resistivity layer. The heterojunction material may exhibit photovoltaic properties. Applications include forming a photovoltaic device with the heterojunction material. | 10-03-2013 |
Daisuke Okumura, Mishima-Gun JP
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20140239170 | TANDEM MASS SPECTROMETER AND MASS SPECTROMETRIC METHOD - An ion trap is provided between a collision cell and a time-of-flight mass separator. During a time period in which precursor ions derived from the same compound are selected with a quadrupole mass filter, a collision energy is changed from one to another. Various product ions that are produced by dissociation respectively under collision energies of the plurality of stages and precursor ions that are not dissociated are temporarily trapped in the ion trap, and are ejected in a packet form in the state where these ions are mixed, and are introduced into the time-of-flight mass separator 6 to be subjected to a mass spectrometry. Thereby, in a data processing unit, one MS/MS spectrum in which product ions produced in various dissociation modes under various CID conditions appear is created. | 08-28-2014 |
20150041642 | MASS SPECTROGRAPH APPARATUS AND METHOD OF DRIVING ION GUIDE - In eight electrodes arranged at an interval of a rotational angle of 45° around an ion optical axis, two neighboring electrodes are electrically connected together as one group, and electrodes in alternate groups are also electrically connected together. A voltage V | 02-12-2015 |
Daisuke Okumura, Shimamoto-Cho JP
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20140252217 | MASS SPECTROMETER - A mass spectrometer having a multi-stage differential pumping system with an ion lens provided in a partition wall separating a second intermediate vacuum chamber and a third intermediate vacuum chamber, the incircle radii of ion guides and the size of the opening of the ion lens are determined so that the circumferential edge of the opening is located outside the circumferential surface of a virtual tubular body straightly connecting the incircle at the rear edge of the second ion guide in the front stage and the incircle at the front edge of the third ion guide in the rear stage. Although the ion lens is located in between, the radio-frequency electric field created by the second ion guide can be effectively connected to the radio-frequency electric field created by the third ion guide through the opening of the ion lens. | 09-11-2014 |
Daisuke Okumura, Mishimagun JP
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20140284473 | ATMOSPHERIC PRESSURE IONIZATION MASS SPECTROMETER - In an atmospheric pressure ionization source using an ESI or the like having a desolvation pipe with one end opening serving as an ion-drawing port, a drying-gas supplying port for supplying a drying gas against the ion-drawing direction is provided below the ion-drawing port, i.e. at a position opposite to the side where a nozzle for spraying a liquid sample into an atmospheric pressure atmosphere is located, as viewed from the ion-drawing port. When the drying gas is supplied from the drying-gas supplying port, the gas pressure becomes higher in a region above the ion-drawing port becomes higher than in a region below the same port and produces a downward air stream. This stream helps ions in the spray flow from the nozzle to easily come close to the ion-drawing port and be efficiently drawn into the desolvation pipe. | 09-25-2014 |