Electric lamp and discharge devices – Cathode ray tube – Screen
Patent
1998-10-16
2000-12-05
Patel, Vip
Electric lamp and discharge devices
Cathode ray tube
Screen
H01J 2910
Patent
active
061571245
ABSTRACT:
An effective picture area A, displaying an image on the inside of a face panel, is curved and has no inflection points. An origin O marks the center of the effective picture area A on the inside of the face panel. The x-axis passes the origin O and is parallel to the long sides X.sub.a of the effective picture area. The y-axis passes the origin O and is parallel to the short sides Y.sub.a of the effective picture area. The z-axis passes the origin O and is parallel to the tube axis. Using a Cartesian coordinate system of the axes x, y, and z, the saggital height Z of any point (x, y, z) on the inner surface of the face panel 4 from the origin O in the direction of the tube is given by Z=a.sub.1 x.sup.2 +a.sub.2 x.sup.4 +a.sub.3 y.sup.2 +a.sub.4 x.sup.2 y.sup.2 +a.sub.5 x.sup.4 y.sup.2 +a.sub.6 y.sup.4 +a.sub.7 x.sup.2 y.sup.4, which describes a curved surface without inflection points. Thus, a cathode ray tube device can be provided, wherein the distortion amount of an inner pincushion distortion in the effective picture area can be decreased without an increase of the deflection power and device costs.
REFERENCES:
Patent Abstracts of Japan, Publication No. 05083585A, published Apr. 4, 1993.
Matsushita Electronics Corporation
Patel Vip
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