Patent ID: 7495223
Filing Date: 2009-02-24
Classification: H01J

Abstract:
1. A photomultiplier tube comprising: a faceplate made from glass for receiving light incident thereon; a photocathode for emitting electrons in response to the light incident on the faceplate; an electron multiplier for multiplying electrons emitted from the photocathode; an anode for generating an output signal based on electrons multiplied by the electron multiplier; a stem plate having a main surface having stem pins for fixing the electron multiplier and the anode thereon; and a metal side tube having an outer side wall extending along a tube axis, an inner side wall opposing the outer side wall, and two open ends for enclosing the electron multiplier and the anode, a first open end of the metal side tube being sealed to the stem plate, wherein the faceplate has two main surfaces and a side face between the two main surfaces, a first main surface of the faceplate receiving the light incident thereon, a second main surface of the faceplate being sealed with a second open end of the metal side tube, the side face including a curved convex portion near the second main surface of the faceplate, the curved convex portion being positioned on the outside of the metal side tube in a direction perpendicular to the tube axis, and the metal side tube has an edge portion on a peripheral portion of the second open end of the metal side tube, the peripheral portion penetrating the second main surface of the faceplate to be embedded therein with the edge portion being directly intimate with the faceplate.