| US 7,489,077 B2 | ||
| Multi-anode type photomultiplier tube | ||
| Suenori Kimura, Hamamatsu (Japan); Takayuki Ohmura, Hamamatsu (Japan); Teruhiko Yamaguchi, Hamamatsu (Japan); and Masuo Ito, Hamamatsu (Japan) | ||
| Assigned to Hamamatsu Photonics K.K., Hamamatsu (Japan) | ||
| Filed on Mar. 24, 2004, as Appl. No. 10/807,292. | ||
| Prior Publication US 2007/0182325 A1, Aug. 09, 2007 | ||
| Int. Cl. H01J 31/50 (2006.01); H01J 43/04 (2006.01); G01T 1/20 (2006.01) | ||
| U.S. Cl. 313—540 [313/535; 313/533; 313/532; 250/214 VT; 250/367] | 11 Claims |
| 1. A multi-anode type photomultiplier tube comprising:
a faceplate made from glasses having an inner surface;
a side tube made from glass and having a hollow shape extending in a tube axial direction which is substantially perpendicular
to the faceplate, the side tube being joined to the faceplate;
a photo cathode formed on the inner surface of the faceplate in the side tube to emit a photoelectron in response to light
incident on the faceplate, the photocathode having a plurality of regions, each of the plurality of regions being defined
by a boundary therebetween;
a partitioning wall having a predetermined length extending from the boundary along the tube axial direction;
a plurality of electron multiplying portions provided in the side tube, the plurality of electron multiplying portions corresponding
to the plurality of regions on the faceplate for multiplying the photoelectron emitted from the photocathode; and
a plurality of anodes provided in the side tube, the plurality of anodes corresponding to the plurality of regions on the
photocathode for receiving an electron emitted from the plurality of electron multiplying portions, wherein
each of the plurality of electron multiplying portions includes:
a first dynode provided in the vicinity of the side tube for multiplying the photoelectron impinging thereon from the photocathode
to emit a secondary electron; and
a second dynode provided in the vicinity of the tube axis for multiplying the secondary electrons impinging thereon from the
first dynode to emit secondary electrons;
wherein the multi-anode photomultiplier tube further comprises:
a shield electrode provided between the second dynode and the photocathode for shielding the second dynode from the photocathode;
the photocathode, the partitioning wall, and the shield electrode are maintained at a same potential.
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