| 摘要 |
A photomultiplier that prevents rattling between the dynodes and the base plates, the parts being fixed securely to achieve excellent vibration resistance. The dynode of the second stage (Dy 2 ) includes a curved surface (Dy 2 A) having an arcuate cross-section and a flat surface (Dy 2 B) formed continuously and flush with the curved surface. The curved surface (Dy 2 A) and flat surface (Dy 2 B) make up the secondary electron emitting surface. Side walls (Dy 2 C) erected from the curved surface (Dy 2 A) are formed through a pressing process on either lengthwise end of the curved surface (Dy 2 A). First ear portions (Dy 2 D) extend outward from both side walls (Dy 2 C). Second ear portions (Dy 2 E) extend outward from both lengthwise ends of the flat surface (Dy 2 B). The first and second ear portions (Dy 2 D and Dy 2 E) are not parallel to each other but form a fixed angle.
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