US 6,614,157 B2Granted

Cathode-ray tube

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsKeiji Matsuo, Hiroji Morimoto, Akira Hayashi

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Abstract

A cathode-ray tube comprising an electron gun (4) disposed in the neck portion (3) of a funnel (2), a deflection yoke (5) having a horizontal deflection coil (51) and a vertical deflection coil (52) mounted on the outer surface of the funnel (2) in a position closer to the front panel than the electron gun (4), and a speed modulation coil (6) mounted on the outer surface of the neck portion (3). The speed modulation coil (6) is so disposed that the end part thereof on the front panel side is closer to the electron gun (4) than the end part of the horizontal deflection coil (51) facing the electron gun (4) and closer to the front panel side the end part of the electron gun (4) facing the front panel. A desired speed modulation effect can be attained because the speed modulation magnetic field (28) of the speed modulation coil (6) does not interfere with the deflection magnetic field and can be prevented from disappearing by causing by causing an eddy current in a top unit (27).

Claims5

Dependent claims

A cathode ray tube device comprising:

a cathode ray tube comprising a front panel, a funnel and an electron gun that is provided inside a neck portion of the funnel;
a deflection yoke comprising a horizontal deflection coil and a vertical deflection coil that are mounted on an outer surface of the funnel and positioned on a side of the front panel with respect to the electron gun;
and
a velocity modulation coil that is mounted on an outer surface of the neck portion;
wherein the electron gun comprises a G4 electrode and a G3 electrode sequentially from the side of the front panel, and a main lens is formed between the G4 electrode and the G3 electrode,
an end of the velocity modulation coil on the side of the front panel is positioned on a side of the electron gun with respect to an end of the horizontal deflection coil on the side of the electron gun and is positioned on the side of the front panel with respect to an end of the electron gun on the side of the front panel, and
in a direction perpendicular to a tube axis of the cathode ray tube, the velocity modulation coil and the G4 electrode are opposed to each other.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/088,006Filed 12 Mar 2002
Priority: JP 2000-22230024 Jul 2000
Published: US 2002/0153825 A124 Oct 2002
Granted: 2 Sep 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01J 29/707
Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least: arrangements intimately associated…
H01J 29/628
Producing fields exhibiting periodic axial symmetry, e.g. multipolar fields: co-operating with or closely associated to an electron gun
H01J 29/705
Convergence correction arrangements therefor: dynamic convergence systems
H01J 2229/4806
Electrodes: shield centering cups