Apparatus for displaying video images

A deflection yoke apparatus for use with a cathode ray tube, said deflection yoke being arranged such that an inner surface thereof is adjacent to an outer surface of said cathode ray tube, said deflection yoke apparatus comprising:

• a rear portion having means for producing a magnetic field having a plurality of barrel shaped field lines associated therewith;
• a front portion having means for producing a magnetic field having a plurality of pin-cushion shaped field lines associated therewith;
• and
• a middle portion located between said front and rear portions;
• said inner surface having a predetermined contour such that each respective end distance between the inner surface of said rear and front portions and respective adjacent parts of said outer surface of said cathode ray tube is relatively small and such that a middle distance between said inner surface of said middle portion and an adjacent part of said outer surface of said cathode ray tube is substantially larger than each of the end distances, said end and middle distances cause said magnetic fields to be enhanced and balanced so as to compensate for undesired pin-cushion distortion and misconvergence errors.

An apparatus for displaying video images with a minimum or relatively low amount of so-called east/west pin-cushion distortion, said apparatus comprising:

• cathode ray tube means including a screen for producing a plurality of electron beams and, in response to a magnetic field having field lines arranged in a predetermined manner, for converging said electron beams onto said screen so as to cause video images corresponding to the converged electron beams to be displayed thereon with a minimal or relatively low amount of said east/west pin-cushion distortion;
• and
• deflection yoke means arranged such that an inner surface thereof is adjacent to an outer surface of said cathode ray tube means for producing said magnetic field, said deflection yoke means having a middle portion and two end portions and being coupled to said cathode ray tube means such that each respective end distance between the inner surfaces of said two end portions and respective adjacent parts of the outer surface of said cathode ray tube means is relatively small and such that a middle distance between the inner surface of said middle portion and an adjacent part of the outer surface of said cathode ray tube means is substantially larger than each of the respective end distances, said end and middle distances cause said magnetic field to be enhanced and balanced so as to compensate for said east/west pin-cushion distortion.

An apparatus for displaying video images, said apparatus comprising:

• cathode ray tube means including a screen for producing a plurality of electron beams each corresponding to a respective color and, in response to a magnetic field having a plurality of field lines, for converging said electron beams onto said screen so as to cause video images corresponding to the converged electron beams to be displayed thereon;
• and
• deflection yoke means for producing said magnetic field, said deflection yoke means including only one deflecting portion having first shaping means arranged at a rear portion of said deflection yoke means for shaping said field lines of said magnetic field so as to have a barrel shape and second shaping means arranged at a front portion of said deflection yoke means for shaping said field lines of said magnetic field so as to have a pin-cushion shape, said deflection yoke means being arranged such that an inner surface thereof is adjacent to an outer surface of said cathode ray tube means, said inner surface and said outer surface having predetermined respective contours such that each respective end distance between the inner surface of said rear and front portions and respective adjacent parts of said outer surface of said cathode ray tube means is relatively small and such that a middle distance between said outer surface of said cathode ray tube means and the inner surface of a middle portion of said deflection yoke means is substantially larger than each of the end distances, said end and middle distances cause said magnetic field to be enhanced and balanced so as to correct for undesired pin-cushion distortion and misconvergence errors.