Convergence device for color-producing cathode ray tube

Details Convergence device for color-producing cathode ray tube Convergence device for color-producing cathode ray tube

1982-06-10

1985-01-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

335212, H01J 2970, H01J 2976

Patent

active

044940475

ABSTRACT:
An electron beam convergence device is provided for a cathode ray tube of the type including an electron beam gun for developing three electron beams disposed on the screen in linear array. First and second rods formed of magnetic material and each including a plurality of pole pairs disposed along the rod are tangentially positioned on opposite sides of the neck of the cathode ray tube, with both axial (i.e., linear) and rotatable motion of the first and second rods being permitted with respect to the cathode ray tube. Axial and rotatable motion of the first rod are operable to adjust the left beam without substantial movement of the center and right beams. Axial and rotatable motion of the second rod are operable to adjust the right beam without substantial movement of the left and center beams.
A purity adjustment device may be provided which includes a manually adjustable rod formed of magnetic material and a pair of pole pieces extending from the rod and curving around a portion of the neck of the cathode ray tube to provide magnetic lines of force which are substantially straight with respect to the cathode ray tube.

REFERENCES:
patent: 3409791 (1968-11-01), Ashizaki et al.
patent: 3512035 (1970-05-01), Egawa et al.
patent: 3852693 (1974-12-01), Schwalm
patent: 3858134 (1974-12-01), Budd
patent: 3942146 (1976-03-01), La Belle

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