Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1996-08-13
1998-05-12
Chilcot, Richard
Electric lamp and discharge devices
Cathode ray tube
Envelope
220 21A, H01J 2952
Patent
active
057511039
ABSTRACT:
The present invention provides an improvement in a color picture tube 10 of a type that has a glass envelope 11 with a substantially rectangular faceplate panel 12, a funnel 16 and a neck 14. The glass envelope 11 has three orthogonal axes, a major axis, X--X, substantially parallel to a wider dimension of the faceplate panel 12, a minor axis, Y--Y, substantially parallel to a narrower dimension of the faceplate panel 12, and a longitudinal axis, Z--Z, extending through the center of the neck 14 and the center of the faceplate panel 12. The funnel 16 has a main body portion 30 and a yoke region 32 which is sealed to the neck 14. The weight of the funnel 16 is reduced by reducing the thickness of a sidewall 31 within the main body portion 30. An increase in tensile stress within the yoke region 32, that results from reducing the thickness of the sidewall 31 in the main body portion 30, is minimized by varying the thickness of a sidewall 33 in the yoke region 32, so that the greatest thickness in the sidewall 33 occurs in proximity to the major axis (X--X).
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patent: 3591035 (1971-07-01), Gossie
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patent: 5155411 (1992-10-01), Swank et al.
patent: 5258688 (1993-11-01), Fondrk
Hutzler Richard Wayne
Opresko Stephen Thomas
Chilcot Richard
Coughlin Jr. Vincent J.
Irlbeck Dennis H.
Patel Harshad
Thomson Consumer Electronics Inc.
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