Color cathode ray tube of shadow mask type

Details Color cathode ray tube of shadow mask type Color cathode ray tube of shadow mask type

1994-10-25

1997-02-25

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313402, H01J 3100

Patent

active

056062176

ABSTRACT:
Curve surface shapes Z.sub.X, Z.sub.Y on the long axis and short axis of at least the outer surface of a face plate are approximated by Z.sub.X =A.sub.1 X.sup.2 +A.sub.2 X.sup.4 +A.sub.3 X.sup.6 and Z.sub.Y =A.sub.4 Y.sup.2 +A.sub.5 Y.sup.4 +A.sub.6 Y.sup.6, and the curved surface shapes P.sub.X, P.sub.Y of at least the outer surface of the face plate panel at points (X=X.sub.1, Y=Y.sub.1) of effective screen boundary portions are given by P.sub.X =A.sub.1 X.sub.1.sup.2 /(A.sub.1 X.sub.1.sup.2 +A.sub.2 X.sub.1.sup.4 +A.sub.3 X.sub.1.sup.6) and P.sub.Y =A.sub.4 Y.sub.1.sup.2 /(A.sub.4 Y.sub.1.sup.2 +A.sub.5 Y.sub.1.sup.4 +A.sub.6 Y.sub.1.sup.6), wherein 0.6<P.sub.X .ltoreq.0.9 and 0.6.ltoreq.P.sub.Y .ltoreq.1.0 are satisfied. The curvature radii R (mm) of the effective screen boundary portion of the short side and long side satisfy the relationship: 2.0 (42.5 V+45.0)<R.ltoreq.4.0 (42.5 V+45.0), where the effective diagonal diameter of the face plate panel is V (inches). This enables a flatter periphery, less distorted panel surface and less doming effect.

REFERENCES:
patent: 4537321 (1985-08-01), Tokita
patent: 4924140 (1990-05-01), Hirai et al.
patent: 5155410 (1992-10-01), Wakasono et al.

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