Method of manufacturing fluorescent screens of color picture tubes
Abstract
Abstract A FLUORESCENT SCREEN OF A COLOR PICTURE TUBE IS MANUFACTURED BY THE METHOD OF FORMING A PHOTOSENSITIVE COATING ON THE INNER SURFACE OF A FACE PLATE OF THE PICTURE TUBE; EXPOSING THE PHOTOSENSITIVE COATING TO LIGHT THROUGH PERFORATIONS OF A SHADOW MASK; REMOVING PORTIONS OF THE COATING THAT HAVE BEEN EXPOSED TO THE LIGHT, THUSLEAVING THE SPOTS OF THE COATING THAT HAVE BEEN EXPOSED TO THE LIGHT; SHRINKING THE SPOTS OF THE COATING; APPOLYING A COATING OF A NONLUMINOUS SUBSTANCE OVER THE ENTIRE AREA OF THE INNER SURFACE OF THE PLATE INCLUDING THE SHRUNK SPOTS; REMOVING THE SHRUNK SPOTS TOGETHER WITH PORTIONS OF THE COATING OF THE NONLUMINOUS SUBSTANCE APPLIED THEREON THUS EXPOSING PORTIONS OF THE INNER SURFACE OF THE FACE PLATE ON WHICH THE SHRUNK SPOTS HAVE BEEN APPLIED; APPLYING A COATING OF A PHOSPHOR ONTO THE ENTIRE SURFACE OF THE REMAINING NONLUMINOUS SUBSTANCE AS WELL AS THE EXPOSED PORTIONS OF THE INNER SURFACE OF THE FACE PLATE; APPLYING A COATING OF PHOTOSENSITIVE MATERIAL INTO THE PHOSPHOR COATING; EXPOSING THE COATING OF THE PHOTOSENSITIVE MATERIAL TO LIGHT BEAMS PASSED THROUGH THE PERFORATIONS OF THE SHADOW MASK THUS FORMING PHOSPHOR DOTS.
Inventors
- 👤 Takao Kawamura
Bibliographic Details
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