Abstract: An exposure device for establishing the phosphor dots of a shadow mask color television tube. The apertures in the shadow mask are optically projected from a light source onto a photosensitive layer on the window of the tube. Arranged between the light source and the shadow mask is a cylinder lens with its axis in the direction of one of the main directions of the deflection coil system.

Abstract: The method of manufacturing a striped screen for a colored cathode-ray tube having a shadow mask with rows of elongate apertures. Adjacent apertures in each row are separated by a solid bridge. The photosensitized screen is exposed to light from a elongate light source parallel to the longitudinal directions of the apertures. By moving the light source uniformly during the exposure over a distance substantially equal to an integral number of times the length of the light source and the direction of the longitudinal axis, a line structure is exposed on the photosensitized screen, and the width of the lines is very constant.

Abstract: A liquid-cooled high-pressure metal vapor discharge lamp, to be used in particular in a method of manufacturing a color television display tube in which a cooling jacket is secured around the discharge tube and on which a thin metal mirror is provided on the inside. The mirror comprises apertures through which light rays of a given intensity as a function of the location emanate without disturbing reflections.