Patent ID: 8115386

Claim:
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 on the opposing surface of the first substrate so as to be spaced away sequentially from a first end side to a second end side and each of which has a secondary electron surface formed on a column-like electrode part which is erected 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 part, thereby converting incident light from outside to photoelectrons to emit the photoelectrons; and an anode part which is installed on the second end side so as to be spaced away from the electron multiplying part to take out electrons multiplied by the electron multiplying part as a signal; the photomultiplier tube, wherein the opposing surface of the second substrate is formed so as to cover the plurality of electron multiplying parts, and a plurality of conductive members which are electrically independent from each other and set equal in potential to the individually opposing electron multiplying parts are installed at sites opposing individually the plurality of electron multiplying parts on the opposing surface along the opposing surface of the second substrate, and wherein all of the stages of electron multiplying parts are fixed on the opposing surface of the first substrate at one end side, wherein all of the conductive members are formed on the opposing surface of the second substrate, wherein the height of the electron multiplying parts are larger than thickness of the conductive members, and wherein each another end side of the electron multiplying parts is positioned close to the opposing conductive member, and each of the electron multiplying parts is electrically-connected to the opposing conductive member.