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:
Sep. 16, 2003
Filed:
Jun. 12, 2002
Applicant:
Inventors:
Junichi Taniguchi, Kyoto, JP;
Eizo Kawato, Kyoto-fu, JP;
Assignee:
Shimadzu Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 4/930 ;
U.S. Cl.
CPC ...
H01J 4/930 ;
Abstract
When ions are introduced from outside into the ion trap space, a static electric field having equi-voltage surfaces concave to the entrance hole is formed in the ion trap space. For ions obliquely entering the ion trap space, such a static electric field makes the ions cross the equi-voltage surfaces at almost perpendicular angles. Owing to such configuration, ions are effectively decelerated, and enough time can be secured until ions of larger mass-to-charge ratios assuredly enter the ion trap space.