Cathode ray tube and method of manufacturing a cathode ray tube
AssigneeU.S. Philips Corporation
InventorLeonardus Th. M. Van Hout
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Abstract
A cathode ray tube in which a glass-enamel layer having particles with a secondary electron emission coefficient smaller than 1, for example Cr.sub.2 O.sub.3 particles, is provided in the neck. The percentage of particles exceeds approximately 30% and the surface resistance ranges between 10.sup.10 and 10.sup.14 .OMEGA./.quadrature.. The high-voltage behaviour of such a layer is satisfactory. The convergence drift is relatively small. In addition, a description is given of a method of providing such a glass-enamel layer.
Claims1
A method of manufacturing a cathode ray tube comprising a glass neck portion and a cone portion, said method comprising providing a suspension of glass-enamel particles and particles of a material having a secondary emission coefficient smaller than 1 on the inside of the neck portion and then melting the glass-enamel particles to form a glass-enamel layer, the weight percentage of said particles of a material having a secondary emission coefficient smaller than 1 in said suspension being such that the weight percentage of said particles in said glass-enamel layer is higher than about 30% and the surface resistance of said glass-enamel layer ranges between about 10.sup.10 and 10.sup.14 .OMEGA./.quadrature..
Dependencies are inferred from the claim text.