Abstract:
Cathode for television tube and method of making wherein a generally circular ceramic body is employed to support a cathode disc in predetermined relation to the G-1 control grid.
Abstract:
The glass envelope for a kinescope for color television includes a faceplate panel with a peripheral flange for sealing with a funnel which defines a constricted neck portion. A shadow mask mounted within the peripheral flange of the faceplate panel is coated with a thin layer of bismuth. The constricted neck of the tube is encompassed with paper pulp impregnated with bismuth trioxide; and the external surface of the funnel from the paper pulp to the flange of the faceplate panel is coated with a nonconducting mixture of bismuth trioxide and sodium silicate thereby providing a kinescope with greatly improved X-ray protection.
Abstract:
A shadow mask is mounted within the faceplate panel of a cathode ray tube for color television at the top and at each side. One of the side mountings is a direct, connection which is nonresilient in a horizontal direction and formed by a bracket fixed to the shadow mask frame and defining a socket for interlocking with the side mounting stud. In one embodiment, this direct connection prevents a lateral motion of the shadow mask frame relative to the faceplate panel while permitting removal of the shadow mask by movement axially of the frame. The top and other side connections are resilient connections, and they are designed to permit a predetermined hinging motion of the shadow mask as it heats up for rotating the mask about the direct connection toward the viewing area thereby correcting for misregistration of the shadow mask apertures with their associated phosphor dot pattern as the shadow mask expands. In one embodiment, the mounting system both rotates and translates the mask toward the screen for correcting for misregistration.