Method of manufacturing electronic tube

A method of manufacturing an electronic tube in which among electron beams irradiated from an electron gun, only those passing through a plurality of apertures of a metal shadow mask are projected to a fluorescent screen to generate a visible light, characterized in that

• an electron reflection coat is formed on the electron gun side surface of said shadow mask to an amount of coating of less than 0.2 mg/cm2 by painting a paint mainly comprising a metal alkoxide of an element with an atomic number not lower than 40.

A method of manufacturing an electronic tube for manufacturing an electronic tube in which among electron beams irradiated from an electron gun, only those passing through a plurality of apertures of a metal shadow mask are projected to a fluorescent screen to generate a visible light, characterized in that

• an electron reflection coat mainly comprising an element with an atomic number not lower than 40 is formed on the electron gun side surface of said shadow mask to an amount of coating of less than 0.2 mg/cm2.

A method of manufacturing an electronic tube in which among electron beams irradiated from an electron gun, only those passing through a plurality of apertures of a metal shadow mask are projected to a fluorescent screen to generate a visible light, characterized in that

• an electron reflection coat is formed on the electron gun side surface of said shadow mask to an amount of coating of not less than 0.2 mg/cm2 and less than 2 mg/cm2 by painting a paint mainly comprising a solated metal oxide of an element with an atomic number from 40 to 69.

A method of manufacturing an electronic tube in which among electron beams irradiated from an electron gun, only those passing through a plurality of apertures of a metal shadow mask are projected to a fluorescent screen to generate a visible light, characterized in that

• an electron reflection coat is formed on the electron gun side surface of said shadow mask to an amount of coating of not less than 0.2 mg/cm2 and less than 2 mg/cm2 by painting a paint mainly comprising a metal alkoxide of an element with an atomic number from 40 to 69.