Beam mislanding correcting system

Details Beam mislanding correcting system Beam mislanding correcting system

1975-06-09

1976-09-14

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315380, 315401, H01J 2976

Patent

active

039809250

ABSTRACT:
A system for compensating for mislanding of electron beams on the screen of a color cathode ray tube resulting from thermal expansion of a beam selecting structure in the tube which comprises electromagnetic devices provided on the tube for producing respective magnetic fields by means of a current supplied thereto so as to change the paths of the electron beams passing through the beam selecting structure, and a circuit for supplying to the electro-magnetic devices a first correcting current varying substantially in response to changes in the temperature of the beam selecting structure and a second correcting current varying in accordance with a predetermined change in value during the initial period of the operating condition of the tube.

REFERENCES:
patent: 2900564 (1959-08-01), Barkow
patent: 3562578 (1971-02-01), Takahashi
patent: 3668464 (1972-06-01), Tokita et al.

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