Cathode ray tube with narrowed neck portion
AssigneeKoninklijke Philips Electronics N.V.
InventorsWillem M. Van Alphen, Daniël Den Engelsen, Mark N. Jonkhof, Michiel H. Wassink, Ronald Van Der Wilk, Antonius H. J. Willems
Life of this patent
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Abstract
A color cathode ray tube comprises an electron gun and a deflection unit, the electron gun being arranged in a neck portion of an envelope, and the deflection unit being arranged around the envelope. The neck portion of the envelope includes a first part in which the electron gun is arranged. Behind this first part, the neck portion narrows (the outside diameter decreases). The deflection unit is at least partly provided around this narrowed part.
Claims7
A cathode ray tube comprising an evacuated envelope having a neck portion in which there is situated an electron gun for generating three electron beams, and an electromagnetic deflection unit, outside the envelope, for deflecting the electron beams across a display screen, characterized in that the neck portion includes a first part in which the electron gun is situated and a narrower second part through which the electron beams generated by the electron gun pass, the largest distance between the centerlines of the electron beams, upon leaving the electron gun, ranging between 8 and 14 mm, and the deflection unit extending at least partly around the narrower second part of the neck.
Dependencies are inferred from the claim text.