Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1998-06-10
2000-05-30
Day, Michael H.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313431, 335210, 335211, G04L 342
Patent
active
060694386
ABSTRACT:
A color CRT including an envelope having a tube axis (Z) and including panel (21) having an inner surface on which a phosphor screen (23) is formed, a funnel (22) connected to the panel (21) and neck (25) connected to the funnel (22), an electron gun assembly (40) arranged in the neck (25) for emitting three in-line electron beams toward the phosphor screen (23), convergence magnetic structure (32) arranged outside of the neck (25) for generating a hexapole magnetic field in the neck (25), a first pair of magnetic members (33A, 33B) arranged outside of the neck on a horizontal axis faced to each other with the electron gun interposed therebetween and extending along the axis of the tube; and a second pair of magnetic members (60A, 60B) so arranged in the X-Y plane as to face each other on a Y-axis and elongated along the magnetic structure (32), respectively, the X-axis corresponding to the horizontal axis, the Y-axis corresponding to the vertical axis normal to the tube axis (Z). The first pair of magnetic members (33A, 33B) extending along the axis of the tube to shield the in-line electron beams from external magnetic fields. The second pair of magnetic members (60A, 60B) are arranged on an inner surface of a ring shaped hexapole magnetic plate 30 symmetrically near the Y-axis. The above arrangement reduces the effect of the magnetic force on the center beam without reducing the effect of the magnetic force on the two side beams in order to minimize the undesired displacement of the center beam.
REFERENCES:
patent: 5557164 (1996-09-01), Chen et al.
patent: 5708323 (1998-01-01), Okamoto
Day Michael H.
Kabushiki Kaisha Toshiba
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