Kabushiki Kaisha Toshiba

Sachiko Muramatsu

Yasuhisa Ohtake

Seiji Sago

Mitsuaki Yamazaki

A color cathode ray tube is disclosed in which a coating containing an aluminum-phosphorus compound and fine particles of at least one of tungsten oxide and bismuth oxide is formed on the surface of a shadow mask on the side of an electron gun.

Color cathode ray tube and method of manufacturing the same

A color cathode ray tube is disclosed in which a coating containing an aluminum phosphorus compound and fine particles of at least one of tungsten oxide and bismuth oxide and is formed on the surface of a shadow mask on the side of an electron gun.

A color cathode ray tube has a face panel, a phosphor screen formed on an inner surface of the face panel, an electron gun for emitting electron beams toward the phosphor screen, and a shadow mask arranged between the electron gun and the face panel to oppose the phosphor screen. The shadow mask has a large number of electron beam apertures through which the electron beams pass. Each of the electron beam apertures has a small opening open to a first surface of the shadow mask and a large opening open to a second surface of the shadow mask and communicating with the small opening. The large opening has a center axis and a diameter larger than that of the small opening. A wall surface of the shadow mask which defines the large opening of each of the electron beam apertures located at a peripheral portion of the shadow mask includes a bulged portion. The bulged portion is located on the opposite side of a mask center with respect to the center axis of the large opening, and is bulged outward in the radial direction.

Growing community of inventors

Tatebayashi, Japan

Sachiko Muramatsu