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:
Mar. 10, 2009
Filed:
Nov. 30, 2004
Eizo Kawato, Kyoto-fu, JP;
Eizo Kawato, Kyoto-fu, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
In the ion storage deviceaccording to the present invention, an LC resonant circuitfor generating an RF voltage for trapping ions is connected to at least one of the electrodesandsurrounding the ion storing space. The LC resonant circuitincludes switching devicesand resistancesfor stopping the RF voltage when the ions stored in the ion storing spaceare ejected. The inductance L, the capacitance C and the resistance R of the LC resonant circuit are set to substantially satisfy the critical damping condition, which means that R=X/2 where X=ωL=(ωC). According to this configuration, the RF voltage damps fast when the RF voltage is stopped by the switching devices, and the deterioration of the mass resolution of the mass analyzer or the peak shift in the mass spectrum is prevented.