Cathode ray tube and an electron multiplying structure therefor

Details Cathode ray tube and an electron multiplying structure therefor Cathode ray tube and an electron multiplying structure therefor

1985-01-29

1986-12-02

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Secondary emissive electrode

313105CM, H01J 3148

Patent

active

046267360

ABSTRACT:
A cathode ray tube comprising a channel plate electron multiplier structure disposed between a source of electrons and an output device such as a cathodeoluminescent screen. The electron multiplier comprises a stack of n apertured dynodes which are separated from each other and are arranged in cascade with the apertures in adjacent dynodes aligned to form channels. In order to improve the resolution of the electron multiplier while enabling the dynodes to be aceptably rigid the axial profile of the apertures in at least the second to the (n-1)th dynodes is such that it comprises a re-entrant portion within the thickness of the dynode with the axially spaced ends of the re-entrant portion being spaced from the respective opposite surfaces of the dynode by a convergent or cylindrical input portion and a divergent or cylindrical output portion. The axial length of the re-entrant portion corresponds substantially to the cross-section of the input (or output) portion at a point where it communicates with the re-entrant portion.

REFERENCES:
patent: 4023063 (1977-05-01), King et al.
patent: 4041343 (1977-08-01), Orthuber
patent: 4329617 (1982-05-01), Littwin
patent: 4482836 (1984-11-01), Washington et al.

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