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:
Dec. 20, 2005
Filed:
Dec. 20, 2004
Eizo Kawato, Kyoto-fu, JP;
Eizo Kawato, Kyoto-fu, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
An ion trap device, which is composed of a ring electrode and a pair of end cap electrodes, according to the present invention includes a capacitor for adjusting a capacitance between the ring electrode and one of the end cap electrodes so that a fluctuation in the voltage of the ring electrode is suppressed when an ion-ejecting voltage is applied to one or both of the pair of end cap electrodes and ions in the ion trap device are ejected. Instead of using a capacitor device, such an object can be realized by modifying a shape of one of the end cap electrodes. The fluctuation in the voltage of the ring electrode can be suppressed when high DC voltages are applied to the end cap electrodes to eject ions from the ion trap device. This enables endowing ejected ions having different mass to charge ratios with the same energy, which prevents the subsequent mass analyzer using the ejected ions from being influenced by the operation parameters, such as the ion-trapping RF voltage, of the ion trap device, and improves the performances, such as the mass resolution and the sensitivity, of the mass analyzer.