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. 22, 2011
Filed:
Mar. 10, 2006
Kazuo Mukaibatake, Kyoto, JP;
Shiro Mizutani, Kyoto, JP;
Kazuo Mukaibatake, Kyoto, JP;
Shiro Mizutani, Kyoto, JP;
Shimadzu Corporation, Kyoto-shi, Kyoto, JP;
Abstract
In conventional mass spectrometers, if ions are converged by a radio-frequency electric field under the condition of relatively high gas pressure, the ions are decelerated and are delayed, or stagnated in an extreme case, to cause a decrease in the detection sensitivity or an appearance of a ghost peak. By contrast, in the mass spectrometer according to the present invention, lens electrodescomprises four plate-shaped electrodesthrough, which are radially arranged around the ion optical axis C at intervals of 90 degrees from each other; the four electrodes placed in the plane being approximately perpendicular to the ion optical axis C form a group, and a plurality of the groups are arranged along the ion optical axis C direction at approximately even intervals. The radio-frequency voltages each applied to each of any pair of electrodes adjacent along the direction of the ion optical axis C have a given amount of phase shift. With this configuration, when ions enter the lens electrode, an ion acceleration effect is exerted in accordance with the amount of phase shift of the adjacent radio-frequency electric fields, and the ions are sequentially accelerated as they travel through the lens electrode. Consequently, a delay or stagnation of the ions can be avoided.