Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1988-05-27
1989-07-11
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313408, 445 30, H01J 2907, H01J 900
Patent
active
048475327
ABSTRACT:
A tensed shadow mask assembly is adapted for repeated precise registration relative to a display screen in order to facilitate processing of the phosphor deposits on the display screen, wherein the registration of the shadow mask relative to the display screen is unaffected by the subsequent permanent sealing of the CRT. A display panel (36) is associated with the CRT faceplate (26) and has an outer edge (38) and a surface that carries a pattern of cathodoluminescent phosphor deposits (44). A rigid band (48) is permanently fastened around the outer edge of the display panel (36). A shadow mask frame (56) having a tensed shadow mask (58) fastened thereto is removably mounted to the band (48). The shadow mask frame (56) and band (48) carry registration mechanisms (70, 72, 76, 78) for orienting the frame (56) at a predetermined position relative to the band (48) (hence, relative to the display panel (36)) whenever the frame (56) is mounted to the band (48). As one aspect of this invention, there is provided a fixture (80) that is attachable to the shadow mask frame (56) and is adapted for mounting and removing the shadow mask frame (56) to and from the band (48).
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DeMeo Palmer C.
Hughey Patrick W.
Tektronix Inc.
Winkelman John D.
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