Color cathode ray tube

Details Color cathode ray tube Color cathode ray tube

1994-12-05

1996-07-23

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

315 15, 3153821, 313414, H01J 2946, H01J 2956

Patent

active

055392784

ABSTRACT:
A color cathode ray tube includes three in-line cathodes, a control electrode, an accelerating electrode, a first focusing electrode member, a second focusing electrode member, an anode, and a phosphor surface disposed in the order listed after the three in-line cathodes along a tube axis, and a fixed resistor disposed inside the color cathode ray tube. The fixed resistor is coupled between the anode and ground, and has a focusing power supply terminal. The three in-line cathodes emit respective electron beams which pass through the control electrode, the accelerating electrode, the first focusing electrode member, the second focusing electrode member, and the anode and land on the phosphor surface. The first focusing electrode member receives a constant focusing voltage from the focusing power supply terminal of the fixed resistor, and the second focusing electrode member receives a dynamic focusing voltage which varies in accordance with a deflection angle of the electron beams. A quadrupole lens is formed between the first focusing electrode member and the second focusing electrode member by the constant focusing voltage received by the first focusing electrode member and the dynamic focusing voltage received by the second focusing electrode member. The quadrupole lens converges each of the electron beams in a first direction and diverges each of the electron beams in a second direction perpendicular to the first direction, and has an intensity which varies in accordance with the dynamic focusing voltage, thereby varying in accordance with the deflection angle of the electron beams.

REFERENCES:
patent: Re34339 (1993-08-01), Osakabe
patent: 4877998 (1989-10-01), Maninger et al.
patent: 4886999 (1989-12-01), Yamane et al.
patent: 5077497 (1991-12-01), Kamohara et al.
patent: 5212423 (1993-05-01), Noguchi et al.

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