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. 26, 2011
Filed:
Dec. 20, 2007
Daisuke Okumura, Kyoto, JP;
Hiroto Itoi, Kyoto, JP;
Daisuke Okumura, Kyoto, JP;
Hiroto Itoi, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
A radio-frequency ion guide () for converging ions by a radio-frequency electric field and simultaneously transporting the ions into the subsequent stage is composed of eight rod electrodes (through) arranged in such a manner as to surround an ion optical axis (C). Each of the rod electrodes (through) is disposed at a tilt with respect to the ion optical axis (C) so that the radius rof the inscribed circle () at the end face of the ion exit side is larger than the radius rof the inscribed circle () at the end face of the ion injection side. Accordingly, the gradient of the magnitude or depth of the pseudopotential is formed in the ion's traveling direction in the space surrounded by the rod electrodes (through). Ions are accelerated in accordance with this gradient. Therefore, even in the case where the gas pressure is relatively high and ions have many chances to collide with gas, it is possible to moderate the ions' slowdown and prevent the ions' delay and stop.