Shadow mask and phosphor screen for color cathode ray tube having major axes of apertures and elements canted to beam scan direction

Claim 2

A shadow mask for use in a color cathode ray tube, comprising a sheet of electrically conductive material having formed therein a plurality of rows of elongated, equally spaced, electrontransmissive apertures which are arranged such that the major axes of the apertures in each row are parallel and canted relative to the direction of electron beam scan across the mask, the apertures in any given row having an angle of canting which is of opposite polarity to the angle of canting of the apertures in adjoining rows.

Claim 3

The mask defined by claim 1 wherein the apertures in any given row of apertures are staggered relative to the apertures in adjoining rows.

Claim 4

The mask defined by claim 2 wherein adjoining rows of apertures are staggered by approximately one-half of the aperture period in the scan direction.

Claim 5

The mask defined by claim 3 wherein the angle of canting of the apertures is equal in all rows but of alternately opposite polarity from one row to the next.

Claim 6

The mask defined by claim 4 wherein said apertures are substantially rectangular in shape.

Claim 7

The mask defined by claim 4 wherein said angle of canting of the apertures is substantially 45*.

Claim 8

The mask defined by claim 1 wherein the length to width ratio of each aperture is in the range of about 2:1 to 6:1.

Claim 9

The mask defined by claim 7 wherein said length to width ratio of each aperture is approximately 3:1.

Claim 10

The mask defined by claim 6 wherein the length to width ratio of each aperture is in the range of about 2:1 to 6:1.

Claim 11

The mask defined by claim 9 wherein said length to width ratio of each aperture is approximately 3:1.

Claim 12

A shadow mask for use in a shadow mask-type color cathode ray tube, comprising a sheet of electrically conductive material having formed therein a pattern of elongated electron-transmissive apertures arranged in first and second arrays of apertures angled with respect to each other and oriented at angles theta 1 and theta 2, respectively, with respect to the direction of electron beam scan across the mask, each array comprising lines of spaced, aligned apertures, the apertures in said lines being staggered from one line to the next, the two arrays being interleaved such that the apertures in one array reside transversely in the inter-aperture spaces in the other array.

Claim 13

A shadow mask for use in a shadow mask-type color cathode ray tube, comprising a sheet of electrically conductive material having formed therein a pattern of elongated electron-transmissive apertures arranged in first and second arrays of apertures angled with respect to each other and oriented at angles theta 1 and theta 2, respectively, with respect to the direction of electron beam scan across the mask, each array comprising lines of spaced, aligned apertures, the apertures in said lines being staggered from one line to the next, the two arrays being interleaved such that the apertures in one array reside transversely in the inter-aperture spaces in the other array.

Claim 14

The mask defined by claim 11 wherein said first and second arrays are substantially perpendicular and wherein theta 1 and theta 2 are each substantially 45*.

Claim 15

In a color cathode ray tube, the combination comprising: means for generating first, second and third substantially horizontally coplanar, mutually intersecting electron beams for carrying red, blue and green video information respectively; a shadow mask located at the locus of convergence of said beams, said mask comprising a sheet of electrically conductive material having formed therein a plurality of rows of elongated, equally spaced, electron-transmissive apertures which are arranged such that the major axes of the apertures in each row are parallel and canted relative to the direction of electron beam scan across the mask, the apertures in any given row having an angle of canting which is of opposite polarity to the angle of canting of the apparatus in adjoining rows; and a phosphoR screen spaced from said mask and including mutually interleaved patterns of red, blue and green phosphor elements, each pattern corresponding to said pattern of apertures in said mask and being displaced horizontally such that said patterns of red, blue and green phosphor elements are exposed through said mask only to said first, second and third electron beams, respectively.

Claim 16

In a color cathode ray tube, the combination comprising: means for generating first, second and third substantially horizontally coplanar, mutually intersecting electron beams for carrying red, blue and green video information respectively; a shadow mask located at the locus of convergence of said beams, said mask comprising a sheet of electrically conductive material having formed therein a plurality of rows of elongated, equally spaced, electron-transmissive apertures which are arranged such that the major axes of the apertures in each row are parallel and canted relative to the direction of electron beam scan across the mask, the apertures in any given row having an angle of canting which is of opposite polarity to the angle of canting of the apparatus in adjoining rows; and a phosphoR screen spaced from said mask and including mutually interleaved patterns of red, blue and green phosphor elements, each pattern corresponding to said pattern of apertures in said mask and being displaced horizontally such that said patterns of red, blue and green phosphor elements are exposed through said mask only to said first, second and third electron beams, respectively.

Claim 17

The combination defined by claim 13 wherein the length to width ratio of each aperture and associated phosphor elements is in the range of about 2:1 to 6:1.

Claim 18

The combination defined by claim 14 wherein said length to width ratio of each aperture is approximately 3:1.

Claim 19

The combination defined by claim 13 wherein adjoining rows of apertures in said mask and adjoining rows of phosphor elements on said screen are staggered.

Claim 20

The combination defined by claim 16 wherein the angle of canting of the apertures in said mask and the associated phosphor elements is equal in all rows but of alternately opposite polarity from one row to the next.

Claim 21

The combination defined by claim 17 wherein said angle of canting of the apertures in said mask and of the associated phosphor elements is substantially 45*.

Claim 22

The combination defined by claim 17 wherein said apertures and associated phosphor elements are substantially rectanglar in shape.

Claim 23

The combination defined by claim 13 wherein said phosphor elements in said pattern of elements are separated each from the others by guard bands of light-absorptive material.

Claim 24

The combination defined by claim 20 wherein adjoining rows of apertures in said mask and associated adjoining rows of phosphor elements are staggered by approximately one-half of the aperture period in the scan direction.

Claim 25

The combination defined by claim 13 wherein said mask apertures and associated phosphor elements in any given row of apertures and elements are staggered relative to the apertures and elements in adjoining rows.

Claim 26

The combination defined by claim 32 wherein said apertures and associated phosphor elements are substantially rectangular in shape.

Claim 27

The combination defined by claim 23 wherein said angle of canting of said apertures and phosphor elements is substantially 45*.

Claim 28

In a color cathode ray tube, the combination comprising: electron gun means for generating first, second and third substantially horizontally coplanar, mutually intersecting electron beams for carrying red, blue and green video information respectively; a shadow mask located at the locus of convergence of said beams, said mask comprising a sheet of electrically conductive material having formed therein a pattern of elongated electron-transmissive apertures arranged in first and second arrays of slots angled with respect to each other and oriented respectively at angles theta 1 and theta 2 with respect to the direction of electron beam scan across the mask, each array comprising lines of spaced slots having common alignment and being staggered from one line to the next, the two arrays being interleaved such that the apertures in one array are located in the inter-aperture spaces in the other array; and a phosphor screen spaced from said mask and including mutually interleaved patterns of red, blue and green phosphor elements, each pattern corresponding to said pattern of apertures in said mask and being displaced horizontally such that said patterns of red, blue and green phosphor elements are exposed through said mask only to said first, second and third electron beams respectively.

Claim 29

In a color cathode ray tube, the combination comprising: electron gun means for generating first, second and third substantially horizontally coplanar, mutually intersecting electron beams for carrying red, blue and green video information respectively; a shadow mask located at the locus of convergence of said beams, said mask comprising a sheet of electrically conductive material having formed therein a pattern of elongated electron-transmissive apertures arranged in first and second arrays of slots angled with respect to each other and oriented respectively at angles theta 1 and theta 2 with respect to the direction of electron beam scan across the mask, each array comprising lines of spaced slots having common alignment and being staggered from one line to the next, the two arrays being interleaved such that the apertures in one array are located in the inter-aperture spaces in the other array; and a phosphor screen spaced from said mask and including mutually interleaved patterns of red, blue and green phosphor elements, each pattern corresponding to said pattern of apertures in said mask and being displaced horizontally such that said patterns of red, blue and green phosphor elements are exposed through said mask only to said first, second and third electron beams respectively.