Patent ID: 7928657

Claim:
A photomultiplier, comprising: a housing having a vacuum inner space maintained in a vacuum state, said housing having a device mount surface serving as one of inner walls defining said vacuum inner space; a photocathode, accommodated in said housing, emitting electrons to the inside of said housing in response to light taken in via said housing; an electron-multiplier section, disposed on said device mount surface of said housing, having dynode channels respectively defined by spaces each extending along an electron traveling direction, the electron-multiplier section having an electron emission terminal; an anode, disposed on said device mount surface of said housing, taking out, as signals, electrons having reached among electrons cascade-multiplied in said electron-multiplier section; a control electrode disposed on said device mount surface of said housing while being electrically separated from said anode, the control electrode provides a sufficient electric potential difference between the electron emission terminal of the electron-multiplier section and the anode, and a wiring part disposed on said device mount surface of said housing while being electrically separated from said anode, said wiring part having one end connected to said control electrode and the other end connected to said electron emission terminal of said electron-multiplier section, wherein said electron-multiplier section, said anode, said control electrode, and said wiring part are disposed in said vacuum inner space of said housing.