Means for securing planar member to cathode ray tube faceplate

Claim 2

A cathode ray tube comprising an evacuated envelope, means in said envelope for producing an electron beam, a faceplate forming part of said envelope, a planar member disposed adjacent the inner surface of said faceplate, a plurality of nonconductive posts having a first end affixed to the inner surface of said faceplate and a second end remote from said first end, each of said posts having a slot in a side thereof into which a peripheral portion of said member is disposed, at least one conductive spring clamp affixed to at least one of said posts, said clamp applying a retaining force to said member and making electrical contact therewith, and means for applying an electrical potential to said clamp.

Claim 3

A cathode ray tube in accordance with claim 1 wherein a conductive coating is disposed on a portion of the inner surface of said evacuated envelope, and said means for applying an electrical potential to said clamp comprises a conductive pad affixed to said at least one post, said clamp being electrically connected to said pad, and conductive spring contact means connected to said pad and contacting said conductive coating.

Claim 4

A cathode ray tube in accordance with claim 2 wherein a hole extends through the central portion of said pad and said pad is affixed to said at least one post by solder glass which is disposed between said pad and said at least one post and extends into said hole.

Claim 5

A cathode ray tube in accordance with claim 3 wherein said posts consist of glass having a thermal coefficient of expansion which is compatible with that of said faceplate.

Claim 6

A cathode ray tube in accordance with claim 4 wherein said posts are in direct contact with said faceplate and are secured thereto by solder glass which surrounds said first ends of said posts.

Claim 7

A cathode ray tube in accordance with claim 5 wherein said faceplate is lens-shaped.

Claim 8

A cathode ray tube in accordance with claim 6 wherein said planar member is a fiber optic plate having a layer of phosphor disposed on that surface thereof which is remote from said faceplate.

Claim 9

A cathode ray tube in accordance with claim 7 wherein said fiber optic plate comprises a plurality of fibers in side-by-side relation with each other, the ends of said fibers forming two planar surfaces, each fiber consisting of a core of photochromic glass having a given indEx of refraction surrounded by a cladding of glass having an index of refraction lower than that of said core.

Claim 10

In a cathode ray tube of the type including an envelope having a longitudinal axis, means at one end thereof for generating at least one electron beam, a faceplate in said envelope remote from said one end, a coating of conductive material disposed on a portion of the inner surface of said envelope, a planar member disposed adjacent to said faceplate and extending across said axis in a position to be scanned by said electron beam, and means for supporting said member in accurately spaced relationship with respect to said faceplate, said supporting means comprising in combination: a plurality of nonconductive posts having a first end affixed to the inner surface of said faceplate and a second end remote from said first end, a slot in each of said posts into which a peripheral portion of said member is disposed, at least one conductive pad having a coefficient of expansion compatible with that of said posts affixed to the second end of at least one of said posts, a first conductive spring clamp affixed to said pad and extending to a peripheral portion of said member, thereby applying a holding force thereto and making electrical contact therewith, and a second conductive spring clamp affixed to said pad and contacting said conductive coating.

Claim 11

In a cathode ray tube of the type including an envelope having a longitudinal axis, means at one end thereof for generating at least one electron beam, a faceplate in said envelope remote from said one end, a coating of conductive material disposed on a portion of the inner surface of said envelope, a planar member disposed adjacent to said faceplate and extending across said axis in a position to be scanned by said electron beam, and means for supporting said member in accurately spaced relationship with respect to said faceplate, said supporting means comprising in combination: a plurality of nonconductive posts having a first end affixed to the inner surface of said faceplate and a second end remote from said first end, a slot in each of said posts into which a peripheral portion of said member is disposed, at least one conductive pad having a coefficient of expansion compatible with that of said posts affixed to the second end of at least one of said posts, a first conductive spring clamp affixed to said pad and extending to a peripheral portion of said member, thereby applying a holding force thereto and making electrical contact therewith, and a second conductive spring clamp affixed to said pad and contacting said conductive coating.

Claim 12

A cathode ray tube in accordance with claim 9 wherein said posts consist of glass having a coefficient of expansion which is compatible with that of said faceplate, the first ends of said posts being in direct contact with said faceplate and being secured thereto by solder glass which surrounds said first end, a hole in the central portion of said pad, a layer of solder glass disposed between said pad and the second end of said post and extending into said hole.