Cathode ray tube gun having nested electrode assembly

Claim 2

In a unitary plural gun assembly, each gun comprising a plurality of axially-aligned electrodes mounted in spaced relation along elongated insulating support means for projecting an electron beam along a beam path in a forward direction, and a pair of magnetic pole pieces disposed primarily in a region beyond the forward end of the forwardmost electrode and on opposite sides of the beam path through said gun; the improvement wherein said pole pieces of each gun are disposed entirely outside of the last electrode, the major portions of said pole pieces extend along the beam path in the region located beyond said forwardmost electrode, and each gun includes a combination magnetic shield and electrode support member comprising a single piece of magnetic metal mounted on at least one of said support means and having a first portion attached to said last electrode, and a second portion spaced axially from said first portion, disposed in said region and extending between said pole pieces of that gun and the pole pieces of the other gun or guns for partially shielding the pole pieces of adjacent guns from each other.

Claim 3

In an assembly of three electron guns disposed side-by-side in delta array, each gun comprising a plurality of axially-aligned electrodes including a final tubular focus electrode mounted in spaced relation along insulating support means for projecting an electron beam along a beam path in a forward direction, and a pair of substantially radial magnetic pole pieces disposed on opposite sides of the beam path therethrough; the improvement wherein said pole pieces of each gun are disposed entirely outside of said tubular electrode, the major portions of said pole pieces extend along the beam path in a region located beyond the forward end of said tubular electrode, and each gun includes a combiNation magnetic shield and electrode support member comprising a single piece of magnetic metal mounted on at least one of said support means and including a first portion attached to said tubular electrode, and a second portion spaced axially from said first portion, disposed in said region and extending between said pole pieces of that gun and the pole pieces of the other two guns for partially shielding the pairs of pole pieces of the three guns from each other.

Claim 4

In an assembly of three electron guns disposed side-by-side in delta array, each gun comprising a plurality of axially-aligned electrodes including a final tubular focus electrode mounted in spaced relation along insulating support means for projecting an electron beam along a beam path in a forward direction, and a pair of substantially radial magnetic pole pieces disposed on opposite sides of the beam path therethrough; the improvement wherein said pole pieces of each gun are disposed entirely outside of said tubular electrode, the major portions of said pole pieces extend along the beam path in a region located beyond the forward end of said tubular electrode, and each gun includes a combiNation magnetic shield and electrode support member comprising a single piece of magnetic metal mounted on at least one of said support means and including a first portion attached to said tubular electrode, and a second portion spaced axially from said first portion, disposed in said region and extending between said pole pieces of that gun and the pole pieces of the other two guns for partially shielding the pairs of pole pieces of the three guns from each other.

Claim 5

The improvement of claim 2, wherein the axial width of said second portion of each of said members is less than half the corresponding width of said pole pieces, whereby the shunting effect of said second portion of the magnetic field between the associated pole pieces is minimized.

Claim 6

The improvement of claim 2, wherein each of said members is generally rectangular with the central portion cut out to form an open frame having four integrally connected sides comprising one side constituting said first portion having its ends attached to said support means and an intermediate portion extending across and attached to said tubular electrode on the side thereof toward the other guns, a side opposite said one side constituting said second portion of said member, and two connecting sides.

Claim 7

The improvement of claim 2, wherein the pole pieces of each gun are attached at one end directly to and supported solely by opposite sides of the exterior of said forward end of said tubular electrode.

Claim 8

A unitary plural gun assembly for use in projecting electron beams toward a screen of a cathode-ray tube comprising, each gun having a plurality of axially-aligned electrodes mounted in spaced relation along elongated insulator support means, a pair of radial convergence magnetic pole pieces attached to the outer sides of and supported by the electrode of each gun nearest said screen, said pole pieces being entirely outside of and extending beyond said electrode nearest said screen toward said screen, a combination magnetic shield and electrode support for each gun comprising a single piece of magnetic metal mounted on at least one of said support means and having a first portion attached to the electrode nearest said screen and interconnecting this electrode with said elongated insulator support means, and a second portion extending toward said screen between pole pieces of at least two adjacent guns.

Claim 9

A unitary plural gun assembly for use in projecting electron beams toward a screen of a cathode-ray tube comprising, each gun having a plurality of axially-aligned electrodes mounted in spaced relation along elongated insulator support means, a pair of radial convergence magnetic pole pieces attached to the outer sides of and supported by the electrode of each gun nearest said screen, said pole pieces being entirely outside of and extending beyond said electrode nearest said screen toward said screen, a combination magnetic shield and electrode support for each gun comprising a single piece of magnetic metal mounted on at least one of said support means and having a first portion attached to the electrode nearest said screen and interconnecting this electrode with said elongated insulator support means, and a second portion extending toward said screen between pole pieces of at least two adjacent guns.

Claim 10

The unitary plural gun assembly as defined in claim 6, wherein each gun in axially-aligned order comprises, a cathode assembly, a control grid, a screen grid, a first focus electrode, a second focus electrode and a third focus electrode, said third focus electrode being nearest said screen, said pair of magnetic pole pieces being attached to approximately opposite sides of an external portion of said third focus electrode.

Claim 11

The unitary plural gun assembly as defined in claim 6, wherein the axial width of the second portion of said combination is less than half the axial width of said pole pieces, wherreby the shunting effect of said second portion on a magnetic field between each pair of pole pieces is minimized.

Claim 12

The unitary plural gun assembly as defined in claim 6, including a plurality of metal leaf springs attached to said second portion and extending therefrom toward said screen.

Claim 13

The unitary plural gun assembly as defined in claim 6, wherein each combination is generally rectangular having an open central portion and four integrally connected sides, one of said sides constituting said first portion and being attached to said support means, a second side opposite said first portion constituting said second portion, and two other sides connecting said first and second portions.