Patent ID: 8354791
Filing Date: 2013-01-15
Classification: H01J

Abstract:
1. A photomultiplier tube comprising: a first substrate and a second substrate which are arranged so as to oppose each other, with the respective opposing surfaces made with an insulating material; a side wall part which constitutes a casing together with the first and the second substrates; a plurality of stages of electron multiplying parts which are arrayed so as to be spaced away sequentially from a first end side to a second end side on the opposing surface of the first substrate; a photocathode which is installed on the first end side so as to be spaced away from the electron multiplying parts, converting incident light from outside to photoelectrons to emit the photoelectrons; an anode part which is installed on the second end side so as to be spaced away from the electron multiplying parts to take out electrons multiplied by the electron multiplying parts as a signal; and a wall-like electrode which is arranged so as to enclose the photocathode when viewed from a direction directly opposite to the opposing surface and having a notched part at a site opposing the electron multiplying parts on the second end side, the wall-like electrode electrically and structurally separated from the plurality of stages of the electron multiplying parts.