Color cathode ray tube having a shadow mask formed of a plate element made of an iron material having an alloy element
AssigneeHitachi, Ltd.
InventorNoriharu Matsudate
Life of this patent
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Abstract
To realize a press mask having a large radius of curvature by making the press mask correct a doming by itself, as material which constitutes a shadow mask, a single plate body which is formed of a composite gradient alloy plate having a concentration gradient of an alloy element which is continuously and gradually decreased from a phosphor-screen-side surface to an electron-gun-side surface is used.
Claims18
A color cathode ray tube having an evacuated envelope which includes a panel which coats phosphor of a plurality of colors on an inner surface thereof, a neck which houses an electron gun and a funnel which connects the panel and the neck and a shadow mask which is installed between the electron gun and the phosphor and has an apertured region formed of plural color selection apertures, wherein
- material which constitutes the shadow mask is formed of a plate body made of an iron material containing an alloy element and the plate body is a composite gradient alloy plate having a concentration gradient of the alloy element which is continuously decreased from a phosphor-side surface to an electron-gun-side surface of the plate body.
A color cathode ray tube having an evacuated envelope which includes a panel which coats phosphor of a plurality of colors on an inner surface thereof, a neck which houses an electron gun and a funnel which connects the panel and the neck and a shadow mask which is installed between the electron gun and the phosphor and has an apertured region formed of plural color selection apertures, wherein
- material which constitutes the shadow mask is formed of a single plate body made of an iron material containing an alloy element and a content of the alloy element at an electron-gun-side surface of the single plate body is set smaller than a content of the alloy element at a phosphor-side surface of the single plate body.
A color cathode ray having an evacuated envelope which includes a panel which coats phosphor of a plurality of colors on an inner surface thereof, a neck which houses an electron gun and a funnel which connects the panel and the neck and a shadow mask which is installed between the electron gun and the phosphor and has plural color selection apertures, wherein
- material which constitutes the shadow mask is formed of a single plate body made of an iron material containing an alloy element and the alloy element contained in the single plate body is different between one surface and the other surface of the single plate body.
Dependencies are inferred from the claim text.