The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 2002
Filed:
Aug. 23, 1999
Yuichiro Hashimoto, Kokubunji, JP;
Takayuki Nabeshima, Kokubunji, JP;
Yasuaki Takada, Kodaira, JP;
Minoru Sakairi, Tokorozawa, JP;
Masamichi Tsukada, Higashiibaraki-gun, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Plasma ion source mass spectrometers or liquid chromatograph/mass spectrometers are provided: wherein photon noises and matrix molecule ions produced by the ion source are decreased, the decrease of the quantity of signal is suppressed, and the apparatus maintenance is improved. The photon noises are decreased with a shielding plate and a 90 degrees deflector. The maintainability in cleaning is improved by a combination of a leading electrode, the shielding plate having a small hole, and a gate valve. The decrease in the quantity of signal is suppressed with the leading electrode, and a double cylindrical type static lens. Position adjustment of the leading electrode is performed with a flat plate having plural holes. Using an ion trap mass analyzer, matrix molecule ions are eliminated by applying a resonance voltage between its end cap electrodes. Decrease in the quantity of signals, which has been a problem, can be prevented, and a high transmission can be realized with a preferable reproducibility against disturbance of an electric field caused by ion lens and the like. A detectable limit of atomic ions of the sample can be improved by eliminating the matrix molecule ions.