Beam mislanding correcting system for color cathode ray tube

Details Beam mislanding correcting system for color cathode ray tube Beam mislanding correcting system for color cathode ray tube

1974-03-14

1976-04-13

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 315401, H01J 2970, H01J 2976

Patent

active

039506711

ABSTRACT:
A system for compensating for mislanding of electron beams on the screen of a color cathode ray tube as a result of thermal expansion of a beam selecting structure in the tube 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 electromagnetic devices a current varying in response to a difference between the temperature of the beam selecting structure and the ambient temperature about the tube. The circuit for supplying a current to the electromagnetic devices may desirably include two temperature responsive elements, such as, variable resistors, respectively responding to variations in the temperature of the beam selecting structure and to variations in the ambient temperature about the tube, and preferably being connected in series across a voltage source with a connection point between the variable resistors being connected to the base electrode for controlling the current flowing through the collector-emitter path of the transistor to the electromagnetic devices.

REFERENCES:
patent: 3398319 (1968-08-01), Lemke et al.
patent: 3398320 (1968-08-01), Hursh
patent: 3402319 (1968-09-01), McDonald et al.
patent: 3424942 (1969-01-01), Barbin
patent: 3668464 (1972-06-01), Tokita et al.

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