Photomultiplier tube having a high resistance dynode support spa

Details Photomultiplier tube having a high resistance dynode support spa Photomultiplier tube having a high resistance dynode support spa

1980-07-28

1986-08-05

Moore, David K.

Electric lamp and discharge devices

Photosensitive

Plural secondary emissive electrodes

313103CM, H01J 4300

Patent

active

046045457

ABSTRACT:
The photomultiplier tube comprises an evacuated envelope having therein a photocathode, an anode, a plurality of spaced apart dynodes for propagating and concatenating electron emission from the photocathode to the anode and a pair of substantially parallel support spacers of insulating material to support the dynodes and the anode. A chrome oxide layer is disposed on the support spacers adjacent to the dynodes and the anode. The chrome oxide layer has a resistance of at least about 10.sup.12 ohms per square to about 10.sup.15 ohms per square. A Nichrome coating overlies an inter-electrode region extending along the concatenating path of the electron emission from the dynodes to the anode. The Nichrome coating has a resistance of greater than 10.sup.6 ohms per square but less than the resistance of the chrome oxide layer.

REFERENCES:
patent: 3114044 (1963-12-01), Sternglass
patent: 3235765 (1966-02-01), Goodrich et al.
patent: 3239709 (1966-03-01), Ramberg
patent: 3243628 (1966-03-01), Matheson
patent: 3321660 (1967-05-01), Ramberg
patent: 3873867 (1975-03-01), Girvin
patent: 3899706 (1975-08-01), Ball
patent: 4010312 (1977-03-01), Pinch et al.

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