Photomultiplier tube having reduced tube length

Details Photomultiplier tube having reduced tube length Photomultiplier tube having reduced tube length

1992-01-09

1993-02-23

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

313105R, H01J 3148

Patent

active

051893380

ABSTRACT:
A photomultiplier tube includes a tube, a focussing electrode unit formed with a photoelectron transmission hole whose center is positioned offset from a central axis of the tube and a dynode positioned in confrontation with the transmission hole. A center of the dynode is also offset from the central axis of the tube. A grid type electrodes array are positioned at the same axial position of the dynode and positioned beside the dynode in a radial direction of the tube. The focussing electrode provides desirable uniformity in distribution of photoelectronics over the dynode even by the deviating position of the photoelectron transmission hole and the dynode. By positioning the dynode away from the central axis in the radial direction of the tube, the grid type electrode array can be positioned beside the dynode. Thus, entire length of the tube can be reduced without any change in a diameter of the tube because of the fact that a length of the dynode in the axial direction of the tube only influences the axial length of the tube.

REFERENCES:
patent: 2433724 (1947-12-01), Wolfgang
patent: 2908840 (1959-10-01), Anderson
patent: 3875441 (1975-04-01), Faulkner
patent: 4415832 (1983-11-01), Faulkner et al.
patent: 5061875 (1991-10-01), Tomasetti et al.
Patent Abstract of JP-A-59-108-254.
IEEE Transaction on Nuclear Science, vol. 33, No. 1, Feb. 1986, New York, pp. 364-369, Kume, et al., "Photomultiplier Tubes for BAF2/BGO Crystal Scintillators".
Patent Abstract of JP-A-59-221-960.

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