Method for manufacturing projection cathode ray tube
OwnerTetsuo Asano, Takashi Hoshimure +1inventors
InventorsTetsuo Asano, Takashi Hoshimure, Sakae Watanabe
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Abstract
A vicinity part of a high-voltage feeding anode terminal, embedded in a funnel part and having a part thereof exposed on an outer wall surface of the funnel part, is washed with a hydrofluoric acid solution to remove a moisture-absorptive deposited substance adhering to the outer wall surface. According to a manufacturing method of this invention, anode leak failure due to unwanted discharge of the vicinity part of the high-voltage feeding anode can be restrained, and a projection cathode ray tube having an excellent display characteristic can be provided.
Claims2
A method of manufacturing a projection cathode ray tube comprising a evacuated envelope that includes a panel, a neck, and a funnel connecting the panel with the neck,
- the method including the step of washing a vicinity part of an anode terminal on an outer wall surface of the funnel with a hydrofluoric acid solution, the anode terminal being embedded in the funnel.
Dependencies are inferred from the claim text.