Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1990-07-23
1991-08-20
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313402, 445 30, H01J 2907
Patent
active
050417568
ABSTRACT:
The present invention provides an improvement in a color picture tube having a tensioned shadow mask and support frame assembly. The mask is rectangular, having two long sides paralleling a central major axis thereof and two short sides paralleling a central minor axis thereof. The mask has a cylindrical contour, with the mask being curved along the major axis and straight along the minor axis. The improvement comprises the frame including two curved members paralleling the major axis and each other and two straight members paralleling the minor axis and each other. The curvature of the curved members matches the curvature of the cylindrical contour of the mask. The two long sides of the mask are welded between the two curved members. Each of the straight members includes two overlapped parts that are welded together where overlapped. Each of the parts is attached to the end of one of the curved members.
REFERENCES:
patent: 4333034 (1982-06-01), Ohgoshi et al.
patent: 4495437 (1985-01-01), Kume et al.
patent: 4766342 (1988-08-01), Fendley et al.
Irlbeck Dennis H.
O'Shea Sandra L.
RCA Licensing Corporation
Tripoli Joseph S.
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