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. 13, 2012
Filed:
Jan. 17, 2008
Masaru Nishiguchi, Kyoto, JP;
Yoshihiro Ueno, Uji, JP;
Daisuke Okumura, Kyoto, JP;
Hiroto Itoi, Kyoto, JP;
Masaru Nishiguchi, Kyoto, JP;
Yoshihiro Ueno, Uji, JP;
Daisuke Okumura, Kyoto, JP;
Hiroto Itoi, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
One virtual rod electrode is composed by a plurality of electrode plane plates arranged in the ion optical axis direction, and four virtual rod electrodes are arranged around the ion optical axis to form a virtual quadrupole rod type ion transport optical system (). In one virtual rod electrode, the interval between the adjacent electrode plane plates is set to be large in the anterior area (A) and small in the posterior area (B). As the interval between electrodes becomes larger, high-order multipole field components increase and therefore the ion acceptance is increased, which enables an efficient acceptance of ions coming from the previous stage. On the other hand, if the interval between electrodes is small, the quadrupole field components relatively increase and the ion beam's convergence is improved. Therefore, ions can be effectively introduced into a quadrupole mass filter for example in the subsequent stage, which contributes to the enhancement of the mass analysis' sensitivity and accuracy.