Patent ID: 7906754
Filing Date: 2011-03-15
Classification: H01J

Abstract:
1. A photomultiplier tube comprising: a vacuum vessel having a faceplate constituting one end and a stem constituting another end, the faceplate having an outer surface, the stem being provided with a support member made of an electrically conductive material; a photocathode that converts incident light incident through the faceplate to electrons; an electron multiplying section that multiplies the electrons emitted from the photocathode, the electron multiplying section including a plurality of dynodes stacked in a plurality of stages including a first dynode at a final stage and a second dynode at a penultimate stage; an electron detecting section that detects the electrons multiplied by the electron multiplying section and outputs an electrical signal indicative of the detected electrons, the electron detecting section including an anode that is arranged between the first dynode and the second dynode and placed on the support member spaced apart from the first dynode; and an inter-layer member that is made of an electrically insulating material and interposed between the anode and the second dynode, wherein the photocathode, the electron multiplying section, and the inter-layer member are provided within the vacuum vessel.