Abstract: According to the present invention, there is provided a color cathode ray tube of multi-purpose use in which as a red phosphor of a color phosphor screen, (ZnCd)S : Ag or (ZnCd)S : Cu phosphor of short decay time is added to rare earth phosphor to have an adding amount of 5 to 30 weight % relative to the total amount of red phosphor so that with respect to the red light emission, the high visibility brightness similar to that of the ordinary color television picture tube can be obtained. Also, since the brightness is lowered rapidly in the early stage of the light emission, the address detection can be carried out positively by, for example, a light pen pick-up.

Abstract: A cathode ray tube having, a panel portion provided with a phosphor screen on its inner surface, a neck portion provided with an electron gun in its inner space, and a funnel portion combined with the panel portion and the neck portion to provide an envelope, in which the electron beam emitted from the electron gun scans the phosphor screen and produces images, and the images are observed from the beam scanning side of the phosphor screen. In the cathode ray tube a thin metal oxide layer is formed on the beam scanning side of the phosphor screen.

Abstract: Method and apparatus for applying a continuous layer of glass frit to a connection or sealing edge surface of the funnel portion of a picture tube. The glass frit flows onto such surface from a nozzle of a glass frit containing pot while the funnel portion is carried by a turntable. Means are provided for rotating the turntable at such a speed that the relative speed, between the nozzle and the connection surface positioned therebelow, is substantially inversely proportional to the width of the connection surface.