Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1994-11-16
1996-05-21
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Envelope
313402, 313481, 313553, H01J 2906, H01J 2994
Patent
active
055192831
ABSTRACT:
The present invention relates to a CRT 10 having an evacuated envelope comprising a funnel 11 sealed at one end to a faceplate panel 12 with a luminescent screen 14 on an interior surface thereof. A color selection electrode 16, mounted on a frame 19, is disposed within the envelope in proximity to the screen. An internal magnetic shield 22, is secured to the frame of the color selection electrode, and is spaced from and extends along at least a portion of the funnel. The magnetic shield has a plurality of openings 32 therethrough. An evaporable getter 28 is disposed within the envelope adjacent to the exterior surface 26 of the magnetic shield 22. The magnetic shield is improved by having tabs or louvers 36, 38, 136, 138, associated with the openings, for restricting the deposition of a film of getter material 30 to the exterior surface 26 of the shield 22. In a second embodiment, two magnetic shields 122, 222, with openings 132 and 232, respectively are attached to the frame 19 of the color selection electrode 16. The openings 132 and 232 are non-aligned, thereby restricting the getter film to the exterior surfaces to the two magnetic shields.
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LaPeruta, Jr. Richard
Opresko Stephen T.
Roland Richard E.
Coughlin Jr. Vincent J.
Irlbeck Dennis H.
O'Shea Sandra L.
Patel Ashok
Thomson Consumer Electronics Inc.
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