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US 5,170,093 AGranted
Method for manufacturing color cathode ray tube
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMorio Yamamoto, Tetsuya Watanabe, Tohru Hanada, Kozoo Nukui, Katsuhiro Ono
Life of this patent
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Abstract
A method for manufacturing a color CRT includes the step of coating a shadow mask of the color CRT in black. It further includes the step of forming an electron beam reflecting film by depositing tungsten oxide with a large electron beam reflection coefficient on the side of an electron beam irradiated surface of the shadow mask coated in black.
Claims4
A method for manufacturing a color cathode ray tube having a shadow mask, comprising the steps of:
- (a) coating the shadow mask with a black layer;
- and
- (b) depositing by evaporation caused by sublimation tungsten oxide, having a large electron beam reflection coefficient, on a side of the shadow mask coated in black to be irradiated by electron beams, to form an electron beam reflecting film to reduce doming of the shadow mask.
A color cathode ray tube comprising:
- an electron beam reflecting film formed by depositing by evaporation caused by sublimation tungsten oxide with a large electron beam reflection coefficient on the side of an electron beam irradiated surface of the shadow mask which is coated in black.
Dependencies are inferred from the claim text.