| 摘要 |
A photomultiplier tube in which a photoelectron beam (42) is divided in N independent paths by means of an electron-optical device. The optical device includes a first cup-shaped focusing electrode (25) having a flat bottom portion of polygonal or circular shape, in which N apertures (30a), (30b) are formed, and having raised side faces (28a), (28b) which extend towards the photocathode (12), viewed in the radial directions corresponding to the elementary photomultipliers, and side faces having V-shaped recesses between these directions. The optical device is completed by a deflection electrode (35) which is brought to approximately the same potential as the photocathode and which is centrally arranged close to the bottom portion of the focusing electrode (25). The assembly is followed by a multiplier (16) of the perforated sheet-type whose focusing electrode (161) has projecting portions (41a), (41b), the multiplier being followed by N anode plates (20a), (20b).
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