Cathode ray tube

Details Cathode ray tube Cathode ray tube

H - Electricity

01

J

313/35

H01J 43/24 (2006.01) H01J 31/12 (2006.01) H01J 43/22 (2006.01)

Patent

CA 1221133

14 ABSTRACT: In order to reduce contrast degradation in an electrostatically scanned flat cathode ray tube (10) hav- ing a channel plate electron multiplier (44), due to back- scattered electrons (46) entering channels remote from their origin, a coating (50) of a material having a low back-scatter coefficient is applied over the input of the electron multiplier (44), between the apertures therein. The surface texture of the material should be microscopic- ally rough. The material can be applied to the first dynode (D1) or to an electrode electrically and physically connected to the first dynode. Optionally the acceptance angle of the channel plate electron multiplier may be restricted.

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