CRT panel glass and production method thereof and CRT
AssigneeAsahi Glass Company, Limited
InventorsNoritoshi Horie, Tsunehiko Sugawara, Takuji Oyama
Life of this patent
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Abstract
A panel glass wherein a surface treating film is formed on a substrate glass so that overall transmittance distribution within an effective picture plane satisfies a specific mathematical expression, whereby, even with a flattened panel glass, a uniform-brightness image can be observed with a good contrast, and occurrence of a double image is suppressed; and a CRT.
Claims14
A CRT panel glass having a surface treating film formed on an outer surface of a substrate glass, characterized in that the surface treating film is formed on the outer surface so that the value A defined by the following mathematical expression (1) is less than 1 within an effective picture plane:
- 2 Value A = [LeftBracketingBar] 1 - Tgf ( min ) Tgf ( max ) 1 - Tg ( min ) Tg ( max ) [RightBracketingBar] Mathematical expression (1)
- In the mathematical expression (1):
- Tg(min) and Tg(max) represent the minimum transmittance (%) and the maximum transmittance (%) of the substrate glass itself, respectively;
- and
- Tgf(max) and Tgf(min) represent the maximum transmittance (%) and the minimum transmittance (%) of an integral body comprising the substrate glass and the surface treating film.
A method for producing a CRT panel glass characterized in that a surface treating film is formed on an outer surface of a substrate glass, characterized in that the surface treating film is formed on the outer surface so that the value A defined by the mathematical expression (1) is less than 1 within an effective picture plane.
Dependencies are inferred from the claim text.