Patent ID: 8294089
Filing Date: 2012-10-23
Classification: H01J

Abstract:
1. A charged particle detecting apparatus arranged in a cabinet of a time-of-flight mass spectrometry system including an ion flying region and detecting ions that have flied through the ion flying region used therefore, the charged particle detecting apparatus including: a microchannel plate, a first electrode arranged on a charged particle incident surface of the microchannel plate, and having an opening to expose the charged particle incident surface of the microchannel plate, a second electrode arranged on an electron exit surface of the microchannel plate with the microchannel plate sandwiched therebetween, and having an opening to expose the electron exit surface of the microchannel plate, a third electrode arranged opposing the exit surface of the microchannel plate with the second electrode sandwiched therebetween, and a rear cover arranged on a surface of the third electrode opposite to a surface opposing the microchannel plate, wherein the first electrode comprises a flange portion to be fitted to the cabinet, and the flange portion is provided in a manner projecting further outside than the components arranged between the rear cover and the first electrode including the rear cover when viewed from the charged particle exit surface side of the microchannel plate, wherein the first electrode is an IN electrode of the microchannel plate, the second electrode is an OUT electrode of the microchannel plate, the third electrode is an anode electrode of the microchannel plate, and wherein the flange portion and the first electrode are an integral one piece structure.