Astigmatic electron lens for a cathode-ray tube

Details Astigmatic electron lens for a cathode-ray tube Astigmatic electron lens for a cathode-ray tube

1980-10-14

1982-12-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313414, H01J 2958

Patent

active

043664199

ABSTRACT:
A focusing electron lens having a controllable astigmatism. An auxiliary electrode affects the non-rotationally symmetrical field defined by two tubular electrodes to vary the convergence in one main direction while maintaining it constant in the other main direction. In an in-line electron gun system in a color television display tube, such a lens corrects for the effect of parastigmatic, self-converging deflection coil systems on the focusing of the electron beams.

REFERENCES:
patent: 2332622 (1943-10-01), Calbick
patent: 3146373 (1964-08-01), Janssen
patent: 3176181 (1965-03-01), Blackler et al.
patent: 3504211 (1981-12-01), Takemoto et al.
patent: 3610992 (1971-10-01), Miyaoka
patent: 3722554 (1973-11-01), Hughes

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