In-line electron gun and method for modifying the same

Claim 2

An in-line electron gun comprising: first electrode means for producing and directing a plurality of electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing said beams, a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with a plurality of co-planar apertures therethrough, and a first pair of magnetically permeable members attached to said back surface of said shield cup, said first pair of magnetic members being disposed adjacent to one of said shield cup aperture, the combination with said shield cup of; a nonmagnetic plate having a plurality of co-planar plate apertures therethrough, and a second pair of magnetically permeable members attached to one surface of said plate, said plate being attached to said back surface of said shield cup so that said second pair of members are disposed between said shield cup and said plate and whereby said plate apertures are substantially aligned with said shield cup apertures.

Claim 3

In an in-line electron gun comprising: first electrode means for producing and directing three electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing said beams, a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with three co-planar apertures therethrough, said shield cup apertures comprising a center aperture and two outer apertures, and a first pair of magnetically permeable members attached to said back surface of said shield cup, said first pair of magnetic members being disposed adjacent to said center shield cup aperture above and below said plane of said apertures, the combination with said shield cup of; a nonmagnetic plate having three co-planar plate apertures therethrough, said plate apertures including a center plate aperture and two outer plate apertures, and a second pair of magnetically permeable members attached to one surface of said plate, said magnetically permeable members being disposed substantially about said outer plate apertures, said plate being attached to said back surface of said shield cup so that said second pair of members are disposed between said shield cup and said plate and whereby said plate apertures are substantially aligned with said shield cup apertures.

Claim 4

In an in-line electron gun comprising: first electrode means for producing and directing three electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing said beams, a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with three co-planar apertures therethrough, said shield cup apertures comprising a center aperture and two outer apertures, and a first pair of magnetically permeable members attached to said back surface of said shield cup, said first pair of magnetic members being disposed adjacent to said center shield cup aperture above and below said plane of said apertures, the combination with said shield cup of; a nonmagnetic plate having three co-planar plate apertures therethrough, said plate apertures including a center plate aperture and two outer plate apertures, and a second pair of magnetically permeable members attached to one surface of said plate, said magnetically permeable members being disposed substantially about said outer plate apertures, said plate being attached to said back surface of said shield cup so that said second pair of members are disposed between said shield cup and said plate and whereby said plate apertures are substantially aligned with said shield cup apertures.

Claim 5

In a method for modifying an in-line electron gun comprising: first electrode means for producing said directing a plurality of electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing beams, and a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with a plurality of co-planar apertures therethrough, one of said aperture having a first pair of magnetically permeable members attached to said back surface adjacent to said aperture, a second pair of magnetically permeable members attached to said back surface, said second pair of members being disposed adjacent to said outer apertures, the improvement comprising the steps of: removing said second pair of members from said back surface of said shield cup, attaching a third pair of magnetically permeable members different from said second pair of members to one surface of a nonmagnetic plate, said plate having a plurality of co-planar plate apertures therethrough, inserting said plate into said shield cup so that said third pair of members are disposed between said back surface of said shield cup and said plate, said outer plate apertures being substantially aligned with said outer shield cup apertures, and fixedly attaching said plate to said shield cup.

Claim 6

In a method for modifying an in-line electron gun comprising: first electrode means for producing said directing a plurality of electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing beams, and a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with a plurality of co-planar apertures therethrough, one of said aperture having a first pair of magnetically permeable members attached to said back surface adjacent to said aperture, a second pair of magnetically permeable members attached to said back surface, said second pair of members being disposed adjacent to said outer apertures, the improvement comprising the steps of: removing said second pair of members from said back surface of said shield cup, attaching a third pair of magnetically permeable members different from said second pair of members to one surface of a nonmagnetic plate, said plate having a plurality of co-planar plate apertures therethrough, inserting said plate into said shield cup so that said third pair of members are disposed between said back surface of said shield cup and said plate, said outer plate apertures being substantially aligned with said outer shield cup apertures, and fixedly attaching said plate to said shield cup.

Claim 7

In a method for modifying an in-line electron gun comprising: first electrode means for producing and directing three electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing said beams, and a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with three co-planar apertures therethrough, said shield cup apertures comprising a center aperture and two outer apertures, said center aperture having a first pair of magnetically permeable members attached to said back surface adjacent to said center aperture, said first pair of members being disposed above and below said plane of said apertures, said outer apertures having a second pair of magnetically permeable members attached to said back surface, said second pair of members being disposed adjacent to said outer apertures, the improvement comprising the steps of: removing said second pair of members from said back surface of said shield cup, attaching a third pair of magnetically permeable members different from said second pair of members to one surface of a nonmagnetic plate, said plate having three co-planar plate apertures therethrough, said plate apertures including a center plate aperture and two outer plate apertures, inserting said plate into said shield cup so that said third pair of members are disposed between said back surface of said shield cup and said plate, said outer plate apertures being substantially aligned with said outer shield cup apertures, and fixedly attaching said plate to said shield cup.

Claim 8

In a method for modifying an in-line electron gun comprising: first electrode means for producing and directing three electron beams along spaced co-planar paths having a common general direction, second electrode means disposed along said beam paths and spaced from said first electrode means for focusing said beams, and a shield cup disposed adjacent to said second electrode means, said shield cup having a back surface with three co-planar apertures therethrough, said shield cup apertures comprising a center aperture and two outer apertures, said center aperture having a first pair of magnetically permeable members attached to said back surface adjacent to said center aperture, said first pair of members being disposed above and below said plane of said apertures, said outer apertures having a second pair of magnetically permeable members attached to said back surface, said second pair of members being disposed adjacent to said outer apertures, the improvement comprising the steps of: removing said second pair of members from said back surface of said shield cup, attaching a third pair of magnetically permeable members different from said second pair of members to one surface of a nonmagnetic plate, said plate having three co-planar plate apertures therethrough, said plate apertures including a center plate aperture and two outer plate apertures, inserting said plate into said shield cup so that said third pair of members are disposed between said back surface of said shield cup and said plate, said outer plate apertures being substantially aligned with said outer shield cup apertures, and fixedly attaching said plate to said shield cup.

Claim 9

The method as in claim 4 wherein said third pair of members are substantially concentrically disposed about said outer plate apertures.

Claim 10

The method as in claim 5 wherein said plate is fixedly attached to said shield cup by welding said plate to said first pair of members.