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

H - Electricity

01

J

313/70, 313/35.3

H01J 43/18 (2006.01) H01J 29/80 (2006.01) H01J 31/50 (2006.01) H01J 43/22 (2006.01) H01J 43/24 (2006.01)

Patent

CA 1232005

14 ABSTRACT: A cathode ray tube comprising a channel plate electron multiplier structure disposed between a source of electrons and a cathodoluminescent screen, the electron multiplier comprising a stack of n apertured dynodes. The dynodes are separated from each other and are arranged in cascade with the apertures in adjacent dynodes aligned to form channels. When designing dynodes an aspect ratio is generally adopted that the axial length of the aperture, which length corresponds to the thickness of the dynode, is the same as the input and output cross-sections of the apertures, which are of re-entrant form. If this aspect ratio is maintained for high resolution dynodes then the dynodes would be so thin as to make them difficult to handle. This problem is mitigated by changing the axial profile of the aperture in at least the second to the (n-1)th dynodes such that it comprises a re-entrant por- tion (24) within the thickness of the dynode (10) with the axially spaced ends (26,28) of the re-entrant portion (24) being spaced from the respective opposite surfaces of the dynode (10) by a convergent or cylindrical input portion (20) and a divergent or cylindrical output portion (22). The axial length of the re-entrant portion (24) corres- ponds substantially to the cross-section of the input (or output) portion at a point where it communicates with the re-entrant portion (24).

473771

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