Abstract

A cathode ray tube has an envelope including a panel and a neck connected by a funnel. The funnel includes a main body portion having first and second regions. The first and second regions have a higher tensile stress than other regions of the main body portion, and the second region has a higher tensile stress than the first region. An anode button is provided in the first region of the main body portion. An exterior surface of the main body portion has first and second protective coatings. The first protective coating covers at least a portion of the first and second regions and is of a composition and thickness such that the first protective coating substantially reduces the susceptibility of the at least one region from incurring mechanical damage. The second protective coating covers at least a portion of the first protective coating and is of a composition and thickness such that the second protective coating protects the funnel from moisture contact.

IPC Classes  ?

• H01J 29/86 - VesselsContainersVacuum locks
• H01J 29/88 - VesselsContainersVacuum locks provided with coatings on the walls thereofSelection of materials for the coatings