Photomultiplier including a photocathode and an accelerating...

Details Photomultiplier including a photocathode and an accelerating... Photomultiplier including a photocathode and an accelerating...

2011-04-12

2011-04-12

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

Photosensitive

Photomultiplier

C250S207000

Reexamination Certificate

active

07923929

ABSTRACT:
The present invention relates to a photomultiplier having a structure that enables to perform high gain and satisfy higher required characteristics. In the photomultiplier, an electron-multiplying unit accommodated in a sealed container comprises a focusing electrode, an accelerating electrode, a dynode unit, and an anode. Particularly, at least the accelerating electrode and dynode unit are held unitedly in a state that at least a first-stage dynode and a second-stage included in the dynode unit are opposite directly to the accelerating electrode not through a conductive material. A conventional metal disk for supporting directly dynodes which are set to the same potential as that of the first-stage dynode is not placed between the accelerating electrode and dynode unit; thus, variations of the transit time of electrons may be drastically reduced while the electrons reach from the cathode to the second-stage dynode via the first-stage dynode.

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patent: A-5-114384 (1993-05-01), None
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