Main lens structure for a color cathode ray tube

A color cathode ray tube comprising an electron gun having electron beam emitting means for emitting three electron beams including one center electron beam and two side electron beams which are disposed generally in parallel in one direction toward a fluorescent face;

• and a main lens for focusing said three electron beams upon said fluorescent face,
• wherein the main lens of said electron gun includes two electrodes arranged to confront each other with flattened apertures such that a diameter H taken in said one direction is larger than a diameter V taken perpendicularly to said one direction,
• wherein the orbits of the two side ones of said three electron beams passing through said main lens are spaced by a constant gap S from the orbit of said center electron beam,
• wherein the relations of H=2(S+R) and R>S hold, in an aperture end portion of the two electrodes of the main lens arranged to confront each other, with the distance between the orbits of said two side electron beams and the inner circumference, as taken in said one direction, of said electrodes constituting said main lens being designated as R, and
• further comprising deflection means interposed between said main lens and said fluorescent face for converging said two side electron beams and said center electron beam upon said fluorescent face.

A color cathode ray tube comprising an electron gun having electron beam emitting means for emitting three electron beams including one center electron beam and two side electron beams generally disposed in parallel in one direction towards fluorescent face;

• and a main lens for focusing said three electron beams upon said fluorescent face,
• wherein the main lens of said electron gun includes two electrodes arranged to confront each other with flattened apertures such that a diameter H taken in said one direction is larger than a diameter V taken perpendicularly to said one direction,
• wherein the orbits of the two side ones of said three electron beams passing through said main lens are spaced by a constant gap S from the orbit of said center electron beam and extend in parallel or diverging directions toward said fluorescent face with respect to the said center electron beam orbit,
• wherein the relations of H=2(S+R) and R>S hold, in an aperture end portion of the two electrodes of the main lens arranged to confront each other, with the distance between the orbits of said two side electron beams and the inner circumference, as taken in said one direction, of said electrodes constituting said main lens being designated as R, and
• further comprising deflection means interposed between said main lens and said fluorescent face for converging said two side electron beams and said center electron beam upon said fluorescent face.