Color picture tube apparatus

Details Color picture tube apparatus Color picture tube apparatus

1996-12-23

1998-11-03

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313414, G09G 104, H01J 2950

Patent

active

058313990

ABSTRACT:
A color picture tube apparatus comprises cathodes, a control electrode, an accelerating electrode, a first focusing electrode, a second focusing electrode and a final accelerating electrode, a voltage applying means which applies a dynamic voltage which increases with increasing deflection angle to the second focusing electrode, a resistor which is connected between the first and second focusing electrodes. Electron beam through holes that are vertically oblong are provided at the facing sides of the second focusing electrode and the final accelerating electrode. A quadrupole electric field lens is formed wherein a focusing effect is obtained in the horizontal direction and a diverging effect is obtained in the vertical direction when the potential level of the second focusing electrode is higher than that of the first focusing electrode. A compensating means generates a combined focusing effect of the electric field lenses formed between the cathodes and the final accelerating electrode stronger in the horizontal direction than in the vertical direction when the potential levels of the first and second focusing electrodes are the same.

REFERENCES:
patent: 4814670 (1989-03-01), Suzuki et al.
patent: 4886999 (1989-12-01), Yamane et al.
patent: 4945284 (1990-07-01), Shimoma et al.
patent: 5519290 (1996-05-01), Sugawara et al.

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