Patent ID: 11955327
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. An ion detector that detects positive ions and negative ions, the ion detector comprising:
a casing on which an ion entrance that allows the positive ions and the negative ions to enter is formed;
a positive ion conversion dynode that is disposed in the casing and configured to be applied with a negative potential;
a scintillator that is disposed in the casing and includes an electron entering surface which secondary electrons emitted from the positive ion conversion dynode enter;
a photodetector configured to detect light emitted from the scintillator corresponding to the entering of the secondary electrons;
a negative potential barrier generation electrode configured to generate a negative potential barrier between the scintillator and the ion entrance; and
a negative ion conversion dynode that is disposed in the casing and configured to be applied with a positive potential or a ground potential,
wherein the positive ion conversion dynode is provided at a distance closer to the scintillator than the negative ion conversion dynode, and
wherein the negative potential barrier generation electrode is a counter electrode that faces the positive ion conversion dynode and is configured to be applied with a negative potential equivalent to or different from the negative potential applied to the positive ion conversion dynode.