Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Reexamination Certificate
2002-05-09
2004-11-02
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
C313S402000, C313S407000
Reexamination Certificate
active
06812628
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to cathode ray tubes (CRTs) of the type having a shadow mask attached to a frame mounted within the tube and, more particularly, to a bracket for suspending a mask-frame assembly at the corners of a faceplate panel in such a CRT.
BACKGROUND OF THE INVENTION
A color cathode ray tube (CRT), has an electron gun for forming and directing three electron beams to a luminescent screen located on a glass faceplate panel. A shadow mask, which may be either a formed mask or a tension mask having strands, is located between the electron gun and the screen. The electron beams emitted from the electron gun pass through apertures in the shadow mask and strike the screen causing the phosphor elements to emit light so that an image is displayed on the viewing surface of the faceplate panel.
CRTs typically have mask frame assemblies comprising a steel frame to support the shadow mask within the faceplate panel of the tube. This frame provides a surface for attachment of a clip that is welded to the exterior surface of the frame typically near the corners. A spring extends from the clip, making a spring-clip assembly, having mounting features for mounting the frame to studs extending inward from the faceplate panel. The surface for the attachment of the spring-clip assembly is usually integrally formed into the frame. Because some tension mask frames are not stamped and formed, however, conventional methods of providing a surface for spring clip attachment are not readily applicable. As a result, a corner bracket is made separately and is later welded to the frame to create the spring-clip mounting surface.
Maintaining the dimensional control of the frame during frame fabrication has been problematic. Further, maintaining the dimensional integrity of the frame during the attachment of the bracket has likewise have been difficult. The dimensional inaccuracies of the frame effect the ability to properly position the spring-clip assembly for attachment. It is therefore desirable to develop a bracket for mounting a spring-clip assembly that can be secured to the side of the frame to ensure proper spring-to-stud spacing and spring fit. Further, it is desirable to develop a versatile bracket design that would simplify the welding and decrease material usage and that can be adapted to accommodate variations in frame width anticipated by manufacturing processes of the mask-frame assembly.
SUMMARY OF THE INVENTION
This invention relates to a cathode ray tube including an evacuated envelope having a substantially rectangular faceplate panel having two diagonal axes that extend between the opposing corners of the panel. The panel includes a shadow mask-frame assembly having a frame with two opposing long sides and two opposing short sides forming a continuous mask support frame and is mounted within the tube by brackets located near the corners of the frame. Each bracket is adjustably secured along the short sides of the frame and includes a flat surface section extending normal to the diagonal axis of the panel. A spring-clip assembly is secured to the flat surface of the bracket for engaging a stud affixed to the panel.
REFERENCES:
patent: 3935496 (1976-01-01), Gijrath
patent: 3943399 (1976-03-01), Sedivy
patent: 3962598 (1976-06-01), Schneider, Jr.
patent: 4994712 (1991-02-01), Strauss
patent: 5023507 (1991-06-01), Dougherty et al.
patent: 5557162 (1996-09-01), Han
patent: 5644192 (1997-07-01), Ragland, Jr.
patent: 0488527 (1991-10-01), None
patent: 1069592 (2001-01-01), None
patent: 1271601 (2003-01-01), None
patent: WO 02/058098 (2002-07-01), None
Herrera Carlos M.
Laks Joseph J.
Patel Vip
Thomson Licensing S.A.
Tripoli Joseph S.
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