Color television tube structure and method of manufacture

摘要

A rimless faceplate is mounted on a shadow mask color selection device for a color television tube construction by indexing means establishing a unique positional relationship between the faceplate and the mask. An array of cavities on the inner surface of the plate interfit with the studs on mask mounting brackets to provide transverse positioning while the bracket surfaces extending outward from the studs provide abutting surfaces to the inner face of the faceplate adjacent its stud receiving cavities to establish faceplate-mask spacing. A glass funnel receives the mask in its divergent end with precise spacing of the mask from its seal edge. Portions of the mask mounting brackets are fitted into seats in the funnel which may be cavities or depressions in the seal edge to establish the spacing, particularly the depth of entry of the mask in the funnel. When the seated bracket portions also support the faceplate indexing studs and are seated in the seal edge of the funnel, a precisely related rugged construction results by sealing those bracket portions in the faceplate-funnel seal. Transverse and circumferential indexing of the mask in the funnel is enhanced by providing integral indexing or reference surfaces on the inner walls of the funnel. Radially outward biasing means on a rigid mask frame are abutted against the internal reference surfaces for transverse orientation of the mask and thus the faceplate. Interfitting protuberances and cavities for the biasing means and reference surfaces, as slots in bosses on the funnel inner surface engaged by studs on the biasing means, provide circumferential orientation of the mask and thus the faceplate on the funnel.