Tri-color cathode ray tube employing a shadow mask having elongated apertures

Claim 2

An apertured shadow mask for use in a color cathode ray tube utilizing a defined number of scan lines per raster frame employing a plurality of three related in-line electron beams wherein said mask having vertical and horizontal axes is utilized in the formation and subsequent operation of a discretely patterned cathodoluminescent screen having a plurally repetitive array of dot-like elongated phosphor areas disposed in substantially horizontal rows therein, saiD mask comprising: a metallic foraminous member having a multitude of elongated apertures having substantially rounded ends defined by the interstitial webbing of said mask member to facilitate contiguity of the elongated phosphor dots comprising said screen pattern; each of said elongated apertures having longitudinal and transverse axes therethrough intersecting at the center thereof; said elongated apertures being arrayed in a substantially uniform pattern with the longitudinal axes of said apertures oriented relative to the vertical axis of said mask and the transverse axes of said apertures oriented relative to the horizontal axis of said mask; the aperture pattern array of said mask being defined by the orientation of said apertures to form a plurality of inter-related horizontal rows and vertical columns whereof the apertures in alternate horizontal rows are vertically aligned; the spacings between the apertures in the horizontal and vertical relationship of the pattern array additionally effecting linear diagonal pitch associations between adjacent apertures in adjacent horizontal rows to also form an array of intersecting diagonal rows; said rows in a given directional orientation being substantially parallel; the dimensional aspects relating to said elongated apertures being referenced in terms of an equilateral parallelogram having definitive acute and obtuse angular vertices formed at the centers of four mutually adjacent apertures located in three sequential horizontal rows, said parallelogram having the obtuse vertices joined by a first diagonal thereacross horizontally oriented to define the center-to-center spacing between horizontally adjacent apertures, said horizontally related apertures having an unbroken area of interstitial webbing therebetween of a height at least equalling the lengths of said apertures, said parallelogram having the acute vertices joined by a second diagonal thereacross vertically oriented to define the centerto-center spacing between vertically adjacent apertures that is greater than the center-to-center spacing between horizontally adjacent apertures, and wherein the vertical center-to-center spacing between adjacent horizontal rows of apertures is of a value substantially other than that resultant from dividing the vertical dimension of the usable mask area by the number of scan lines utilized in scanning said usable area to minimize subsequent moire pattern effect.

Claim 3

An apertured shadow mask according to claim 1 wherein said elongated apertures have a longitudinal to transverse aspect ratio ranging substantially from 2:1 to 20:1.

Claim 4

An apertured shadow mask according to claim 1 wherein said elongated apertures have a longitudinal to transverse aspect ratio ranging substantially from 3:1 to 10:1.

Claim 5

An apertured shadow mask according to claim 1 wherein the elongated apertures provide a center transmission factor exceeding substantially 18 percent per unit of mask area.

Claim 6

An apertured shadow mask according to claim 1 wherein the relationship of the vertical center-to-center spacing between adjacent horizontal rows of apertures and the horizontal center-to-center spacing between adjacent apertures is expressed by a ratio exceeding 0.5 to 1.

Claim 7

An apertured shadow mask according to claim 1 wherein said elongated apertures have length and width dimensions wherein the aperture length is a value smaller than the vertical center-to-center spacing between adjacent horizontal rows of apertures, and wherein the aperture width is a value smaller than one-third of the horizontal center-to-center spacing between adjacent apertures.

Claim 8

An improved shadow mask according to claim 1 wherein the vertical spacing between adjacent horizontal rows of apertures is of a value other than that substantially resultant from dividing the vertical dimension of the usable mask area by the number of visible electron beam scan lines utilized in scanning the display area of the mask to minimize subsequent moire pattern effect.

Claim 9

A color cathode ray tube utilizing a defined number of scan lines per raster frame comprising: an envelope formed as an integral enclosure medium having a face panel with adjoined funnel and neck portions; an integrated electron gun structure positioned within said envelope neck portion in a manner to beam a plurality of three ultimately converging in-line electron beams toward said panel; a shadow mask member having a multitude of elongated apertures formed therein and vertical and horizontal axes thereacross; said mask being oriented forward of said electron gun structure in spaced adjacency to the interior surface of said face panel at the convergence position of said plural in-line electron beams, each of said elongated apertures having substantially rounded ends defined by the interstitial webbing of said mask has longitudinal and transverse axes therethrough intersecting at the center thereof; said elongated apertures being arrayed in a substantially uniform pattern with the longitudinal axes of said apertures oriented relative to the vertical axis of said mask and the transverse axes of said apertures oriented relative to the horizontal axis of said mask; the aperture pattern array of said mask being defined by the orientation of said apertures to form a plurality of inter-related horizontal rows and vertical columns whereof the apertures in alternate horizontal rows are vertically aligned; the spacings between the apertures in the horizontal and vertical relationships of the pattern array additionally effecting linear diagonal pitch associations between adjacent apertures in adjacent horizontal rows to also form an array of intersecting diagonal rows; said rows in a given directional orientation being substantially parallel; the dimensional aspects relating to said elongated apertures being referenced in terms of an equilateral parallelogram having definitive acute and obtuse angular vertices formed at the centers of four mutually adjacent apertures located in three sequential horizontal rows, said parallelogram having the obtuse vertices joined by a first diagonal thereacross horizontally oriented to define the center-to-center spacing between horizontally adjacent apertures, said horizontally related apertures having an unbroken area of interstitial webbing therebetween of a height at least equalling the lengths of said apertures, said parallelogram having the acute vertices joined by a second diagonal thereacross vertically oriented to define the center-to-center spacing between vertically adjacent apertures that is greater than the center-to-center spacing between horizontally adjacent apertures the vertical center-to-center spacing between adjacent horizontal rows of apertures being of a value substantially other than that resultant from dividing the vertical dimension of the usable mask area by the number of scan lines utilized in scanning said usable area to minimize subsequent moire pattern effect, and a cathodoluminescent screen having a repetitive patterned array of substantially contiguous nesting phosphor areas formed in substantially horizontal rows on the interior surface of said face panel adjacent to said mask, said phosphor areas being of round-ended elongated shapes similar to the elongated apertures in said mask having been formed by the utilization of said apertures.

Claim 10

A color cathode ray tube utilizing a defined number of scan lines per raster frame comprising: an envelope formed as an integral enclosure medium having a face panel with adjoined funnel and neck portions; an integrated electron gun structure positioned within said envelope neck portion in a manner to beam a plurality of three ultimately converging in-line electron beams toward said panel; a shadow mask member having a multitude of elongated apertures formed therein and vertical and horizontal axes thereacross; said mask being oriented forward of said electron gun structure in spaced adjacency to the interior surface of said face panel at the convergence position of said plural in-line electron beams, each of said elongated apertures having substantially rounded ends defined by the interstitial webbing of said mask has longitudinal and transverse axes therethrough intersecting at the center thereof; said elongated apertures being arrayed in a substantially uniform pattern with the longitudinal axes of said apertures oriented relative to the vertical axis of said mask and the transverse axes of said apertures oriented relative to the horizontal axis of said mask; the aperture pattern array of said mask being defined by the orientation of said apertures to form a plurality of inter-related horizontal rows and vertical columns whereof the apertures in alternate horizontal rows are vertically aligned; the spacings between the apertures in the horizontal and vertical relationships of the pattern array additionally effecting linear diagonal pitch associations between adjacent apertures in adjacent horizontal rows to also form an array of intersecting diagonal rows; said rows in a given directional orientation being substantially parallel; the dimensional aspects relating to said elongated apertures being referenced in terms of an equilateral parallelogram having definitive acute and obtuse angular vertices formed at the centers of four mutually adjacent apertures located in three sequential horizontal rows, said parallelogram having the obtuse vertices joined by a first diagonal thereacross horizontally oriented to define the center-to-center spacing between horizontally adjacent apertures, said horizontally related apertures having an unbroken area of interstitial webbing therebetween of a height at least equalling the lengths of said apertures, said parallelogram having the acute vertices joined by a second diagonal thereacross vertically oriented to define the center-to-center spacing between vertically adjacent apertures that is greater than the center-to-center spacing between horizontally adjacent apertures the vertical center-to-center spacing between adjacent horizontal rows of apertures being of a value substantially other than that resultant from dividing the vertical dimension of the usable mask area by the number of scan lines utilized in scanning said usable area to minimize subsequent moire pattern effect, and a cathodoluminescent screen having a repetitive patterned array of substantially contiguous nesting phosphor areas formed in substantially horizontal rows on the interior surface of said face panel adjacent to said mask, said phosphor areas being of round-ended elongated shapes similar to the elongated apertures in said mask having been formed by the utilization of said apertures.

Claim 11

A color cathode ray tube according to claim 8 wherein said plurality of electron beams emanate as three beams in a horizontal in-line arrangement whereof the in-line plane substantially corresponds with the horizontal axis of said mask.

Claim 12

A color cathode ray tube according to claim 8 wherein the elongated apertures in said shadow mask member having a longitudinal to transverse aspect ratio ranging substantially from 2:1 to 20:1.

Claim 13

A color cathode ray tube according to claim 8 wherein the elongated apertures in the shadow mask evidence a spacing relationship whereof the vertical spacing between adjacent hoRizontal rows of apertures and the horizontal spacing between adjacent apertures is expressed by a ratio exceeding 0.5 to 1.

Claim 14

A color cathode ray tube according to claim 8 wherein the elongated apertures of the shadow mask have length and width dimensions wherein the aperture length is of a value smaller than the vertical center-to-center spacing between adjacent horizontal rows of apertures, and wherein the aperture width is of a value smaller than one-third of the horizontal center-to-center spacing between adjacent apertures.

Claim 15

A color cathode ray tube according to claim 8 wherein the elongated apertures of said shadow mask provide a center transmission factor exceeding substantially 18 percent per unit of mask area.