Cathode ray tube with dynode having restricted entry angle

Details Cathode ray tube with dynode having restricted entry angle Cathode ray tube with dynode having restricted entry angle

H - Electricity

01

J

313/35

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

Patent

CA 1221132

16 ABSTRACT: In order to reduce contrast degradation in an electrostatically scanned flat cathode ray tube (10) having a channel plate electron multiplier (44), due to back- scattered electrons (45) entering channels remote from their origin, steps are taken to restrict the acceptance angle of the channel plate electron multiplier. In one arrangement means are provided on the input surface to restrict the angle of entry to a range normally associated with the addressing electron beam (arrow A). In another arrangement (Figures 9A and 9B or Figure 10) the ready emission of secondary electrons is restricted to a pre- determined arcuate portion of the input of each channel of the electron multiplier. In either arrangement stray electrons (arrows B and C) are unable to impinge upon the secondary emitting material (48) or surface in the channels and in consequence produce many fewer back-scattered elec- trons. Optionally a material (50) having a low back- scatter coefficient and a microscopically rough surface texture may be applied to the exposed surfaces, apart from the apertures, of the input side of the electron multi- plier (44).

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