Cathode ray tubes.

摘要

@ A cathode ray tube includes a fluorescent screen (11) formed on an inner surface of a face plate (2) thereof and a metal backing layer (5) formed on the fluorescent screen. The fluorescent screen (11) comprises a fluorescent material which includes fluorescent particles and has a composition such that an amount of not less than 0.6 parts by weight of Si02 per 100 parts by weight of fluorescent particles is present in a portion (11A) of the material that contacts the face plate (2), the amount of SiO2 being insufficient to cause the brightness of the fluorescent particles to deteriorate, and not more than 0.3 parts by weight of SiO2 per 100 parts by weight of fluorescent particles is present in a portion (11B) of the fluorescent material that faces the metal backing layer (5).