Patent ID: 8207491
Filing Date: 2012-06-26
Classification: H01J

Abstract:
1. A mass spectrometer having a virtual multipole rod type ion transport optical system in which 2n (where n is an integer equal to or more than two) virtual rod electrodes composed of m (where m is an integer equal to or more than two) electrode plain plate portions which are mutually separated in an ion optical axis direction are provided in such a manner as to surround the ion optical axis, wherein n electrode plain plate portions belonging to every other virtual rod electrode around the ion optical axis and being provided in a plane orthogonal to the ion optical axis, and a connector portion for electrically connecting these n electrode plain plate portions are integrated into an electrode member made from a single conducting plate, and 2m electrode members are arranged in such a manner as to be mutually separated in the ion optical axis direction to form the virtual multipole rod type ion transport system.