公开(公告)号：US20180071750A1

公开(公告)日：2018-03-15

申请号：US15698000

申请日：2017-09-07

Applicant: SHIMADZU CORPORATION

Inventor： Hiroshi SEKI ,  Yoshihiro UENO ,  Hiroshi OKUDA ,  Hiromu SAKURAI

IPC: B03C3/47 ,  B03C3/41 ,  B03C3/017 ,  G01N1/22 ,  G01N15/02

CPC classification number: B03C3/47 ,  B01D53/32 ,  B03C3/0175 ,  B03C3/41 ,  G01N1/2205 ,  G01N1/40 ,  G01N15/0266 ,  G01N2001/4038 ,  G01N2015/0038

Abstract: A gas stream containing charged particles is introduced through a first gas inlet port into a first space, while another gas stream containing charged particles is introduced through a second gas inlet port into a second space located below and separated from the first space by a mesh-like filter. Voltages are respectively applied to an upper plate electrode, lower plate electrode 16 and filter to create a DC electric field within a housing. Due to this electric field, the charged particles contained in the gas stream flowing in the first space move toward the second space. The charged particles which have entered the second space through the openings of the filter are extracted through a gas outlet port along with the charged particles originally contained in the gas stream flowing in the second space.

公开(公告)号：US20170229275A1

公开(公告)日：2017-08-10

申请号：US15501935

申请日：2014-08-08

Applicant: SHIMADZU CORPORATION

Inventor： Yoshihiro UENO ,  Hiroshi SEKI ,  Hiroshi OKUDA

IPC: H01J27/02 ,  G01N27/62 ,  H01J49/12

CPC classification number: H01J27/024 ,  B03C7/02 ,  G01N15/0266 ,  G01N27/62 ,  G01N27/622 ,  G01N2015/0038 ,  H01J37/32009 ,  H01J37/32082 ,  H01J37/321 ,  H01J37/32357 ,  H01J37/3244 ,  H01J37/32532 ,  H01J49/10 ,  H01J49/12

Abstract: A particle charger is provided with: a filter (28) partitioning the inside of a housing (20) into a first space (29) and second space (30); a particle introducer (22) for introducing a particle into the first space; a gas ion supplier (10) for supplying the first space with a gas ion; a potential gradient creator (26, 27, 31) for creating a potential difference within the housing so as to make the gas ion and a charged particle resulting from a contact of the aforementioned particle with the gas ion move toward the second space; an AC voltage supplier (32, 33) for applying AC voltages having a phase difference to the neighboring electrodes (28a, b) included in the filter; a controller (35) for performing a control for applying, to the plurality of electrodes, predetermined voltages so as to allow the charged particle to pass through a gap between the electrodes while trapping the gas ion by the electrodes; and a charged particle extractor (23, 25, 34) for extracting the charged particle admitted to the second space to the outside of the housing. By this configuration, the occurrence frequency of the multi-charging is suppressed.

公开(公告)号：US20170138831A1

公开(公告)日：2017-05-18

申请号：US15323579

申请日：2015-06-26

Applicant: SHIMADZU CORPORATION ,  NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY

Inventor： Hiroshi OKUDA ,  Yoshihiro UENO ,  Hiroshi SEKI ,  Hiromu SAKURAI

IPC: G01N15/02 ,  B03C3/38 ,  B03C3/68 ,  B03C7/02

CPC classification number: G01N15/0266 ,  B03C3/017 ,  B03C3/361 ,  B03C3/38 ,  B03C3/41 ,  B03C3/47 ,  B03C3/68 ,  B03C7/02 ,  B03C2201/06 ,  G01N2015/0038 ,  G01N2015/0288 ,  H01T19/04 ,  H01T23/00

Abstract: In unipolar charging, a discharge current value at which charging efficiency is best and a discharge current dependency of multivalent charging differ depending on the particle size of the particles that are the object of charging. Therefore, for each particle size, a discharge voltage at which univalent charging efficiency is best and a discharge voltage at which the signal-to-noise ratio of a signal when particles of a different size are regarded as noise is best are obtained through experiment and stored in a storage unit (21). When scanning a classification voltage that is applied to a classification unit (32) of a DMA (3) to measure particle size distribution, a system controlling unit (2) acquires an optimal voltage corresponding to a particle size from the storage unit (21), and in conjunction with scanning of the classification voltage, controls a discharge power source (11) via a discharge voltage controlling unit (10) so that the discharge voltage is scanned in accordance with changes in particle size. It is thereby possible, for example, to reduce the amount of multivalent charged particles of different particle sizes that are mixed in with particles with a predetermined particle size that are extracted by classification, and to accurately determine the particle size distribution.