Color picture tube of in-line gun type operable at high horizontal scanning frequency
AssigneesHitachi, Ltd., Hitachi Device Engineering Co., Ltd.
InventorsTakateru Kakesu, Hideo Oomori
Life of this patent
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Abstract
A color picture tube having an in-line electron gun and using a high frequency magnetic field for the horizontal deflection of three electron beams is disclosed in which a conductive skirt member is bonded to a portion of the side wall of a shielding electrode to reduce the resistance of the portion so that three electron beams are equally affected by a magnetic field induced by an eddy current in the side wall of the shielding electrode, and further a leg portion is extended from the skirt member to keep the tip of the leg portion in electrical contact with the inner surface of an electron tube and to support the electron gun by the leg portion.
Claims4
A color picture tube operable at a high horizontal scanning frequency, comprising:
- an electron gun of the in-line type disposed in an electron tube for emitting three electron beams;
- a shielding electrode disposed at the top of the electron gun and having the form of a cup for shielding the electron beams electrostatically from the outside, apertures for transmitting the electron beams being formed in the bottom of the cup so as to be in alignment;
- and
- supporting means made of a conductive material and kept in contact with the cup, the supporting means having a leg portion and a skirt portion, the leg portion and the skirt portion being united in one body, the tip of the leg portion being kept in contact with the inner surface of the electron tube, a portion of the side wall of the cup being covered by the skirt portion so that the central and outer ones of the electron beams are equally affected by a magnetic field induced by an eddy current in the shielding electrode.
Dependencies are inferred from the claim text.