Beam-deflection system for color television picture tube

Claim 2

A color-television picture tube comprising an envelope provided at one end with a luminescent screen; a source of several parallel coplanar electron beams in said envelope trained upon said screen; and electromagnetic deflecting means for displacing said beam in two orthogonal directions parallel and perpendicular to the plane of said beams, said deflecting means including a first coil connected to a supply of line-scanning current, a second coil coaxial with said first coil connected to a supply of frame-scanning current, a common toroidal core for said coils, and a third coil coaxially juxtaposed with said core; said first coil consisting of wire would on said core in a single layer of turns distributed in two symmetrical groups about a first diametral plane parallel to the plane of said beams, said groups being separated on opposite sides of a second diametral plane perpendicular to the plane of said beams with generation of a first magnetic field having outwardly convex lines of force on opposite sides of said second plane; said second coil consisting of wire wound on said core in overlapping relationship with said first coil in a single layer of turns distributed in two symmetrical groups about said second plane while being separated on opposite sides of said first plane with generation of a second magnetic field having outwardly convex lines of force on opposite sides of said first plane, the intensity of said fields being substantially uniform in the region of said beams; said third coil being coaxially juxtaposed with said core and provided with a winding split into two separated halves generally coextensive with the groups of said first coil and connected to said supply of frame-scanning current, said halves being interconnected in mutually inverted relationship with reference to the groups of said first coil to generate a supplemental magnetic field having outwardly concave lines of force on opposite sides of said second plane.

Claim 3

A tube as defined in claim 1 wherein said core converges from a sharp-rimmed end of relatively large diameter to a flat annular end face of relatively small diameter.

Claim 4

A tube as defined in claim 2, further comprising two rings respectively overlying said sharp-rimmed end and said flat end face, said rings being provided with peripherally spaced slots accommodating said turns.

Claim 5

A color-television picture tube comprising an envelope provided at one end with a luminescent screen; electron-emissive means for generating several coplanar electron beams in said envelope trained upon said screen; converging means in the path of said beams for making same parallel on their way to said screen; and electromagnetic deflecting means beyond said converging means for displacing said beams in two orthogonal directions parallel and perpendicular to the plane of said beams, said deflecting means including a first coil connected to a supply of line-scanning current, a second coil coaxial with said first coil connected to a supply of frame-scanning current, and a common toroidal coRe for said coils; said first coil consisting of wire wound on said core in a single layer of turns distributed in two symmetrical groups about a first diametral plane parallel to the plane of said beams, said groups being separated on opposite sides of a second diametral plane perpendicular to the plane of said beams by gaps extending each over an arc of about 80* to generate a first magnetic field having outwardly convex lines of force on opposite sides of said second plane; said second coil consisting of wire wound on said core in a single layer of turns split into four quadrantal groups separated by relatively small gaps, each extending over an arc of substantially 12*, along said second plane and by relatively large gaps, each extending over an arc of substantially 30* , along said first plane to generate a second magnetic field having outwardly convex lines of force on opposite sides of said first plane, the intensity of said fields being substantially uniform in the region of said beams, the two groups of said first coil overlapping the four groups of said second coil by about 30* per quadrant.

Claim 6

A color-television picture tube comprising an envelope provided at one end with a luminescent screen; electron-emissive means for generating several coplanar electron beams in said envelope trained upon said screen; converging means in the path of said beams for making same parallel on their way to said screen; and electromagnetic deflecting means beyond said converging means for displacing said beams in two orthogonal directions parallel and perpendicular to the plane of said beams, said deflecting means including a first coil connected to a supply of line-scanning current, a second coil coaxial with said first coil connected to a supply of frame-scanning current, and a common toroidal coRe for said coils; said first coil consisting of wire wound on said core in a single layer of turns distributed in two symmetrical groups about a first diametral plane parallel to the plane of said beams, said groups being separated on opposite sides of a second diametral plane perpendicular to the plane of said beams by gaps extending each over an arc of about 80* to generate a first magnetic field having outwardly convex lines of force on opposite sides of said second plane; said second coil consisting of wire wound on said core in a single layer of turns split into four quadrantal groups separated by relatively small gaps, each extending over an arc of substantially 12*, along said second plane and by relatively large gaps, each extending over an arc of substantially 30* , along said first plane to generate a second magnetic field having outwardly convex lines of force on opposite sides of said first plane, the intensity of said fields being substantially uniform in the region of said beams, the two groups of said first coil overlapping the four groups of said second coil by about 30* per quadrant.

Claim 7

A tube as defined in claim 4 wherein each group of said first coil consists of two halves on opposite sides of said first plane, each half containing 22 turns whose angular distance from said first plane is given substantially by the following Table: 1 0*59''9 16*36''17 34*51''2 2*03''10 18*45''18 37*23''3 4*06''11 20*55''19 40*4 6*09''12 23*08''20 42*43''5 8*13''13 25*22''21 45*34''6 10*17''14 27*40''22 48*35''7 12*22''15 30*8 14*28''16 32*23''

Claim 8

A tube as defined in claim 4 wherein each group of said second coil contains 25 turns whose angular distance from said second plane is given substantially by the following Table: 1 6*09''10 25*22''19 48*35''2 8*13''11 27*40''20 51*48''3 10*17''12 30*21 55*13''4 12*22''13 32*23''22 58*59''5 14*28''14 34*51''23 63*13''6 16*36''15 37*23''24 68*12''7 18*45''16 40*25 74*37''8 20*55''17 42*43''9 23*08''18 45*34''

Claim 9

A color-television picture tube comprising an envelope provided at one end with a luminescent screen; a source of several parallel coplanar electron beams in said envelope trained upon said screen; and electromagnetic deflecting means for displacing said beam in two orthogonal directions parallel and perpendicular to the plane of said beams, said deflecting means including a first coil connected to a supply of line-scanning current, a second coil coaxial with said first coil connected to a supply of frame-scanning current, and a common toroidal core for said coils; said first coil consisting of wire wound on said core in a single layer of turns distributed in two symmetrical groups about a first diametral plane parallel to the plane of said beams, said groups being separated on opposite sides of a second diametral plane perpendicular to the plane of said beams with generation of a first magnetic field having outwardly convex lines of force on opposite sides of said second plane; said second coil consisting of wire wound on said core in a single layer of turns split into four quadrantal groups separated by Relatively small gaps along said second plane and by relatively large gaps along said first plane with generation of a second magnetic field having outwardly convex lines of force on opposite sides of said first plane, the intensity of said fields being substantially uniform in the region of said beams, the two groups of said first coil being separated along said second plane while overlapping the four groups of said first coil by about 30* per quadrant; said deflecting means further including a third coil coaxially juxtaposed with said core and provided with a winding split into two widely separated halves generally coextensive with the groups of said first coil and connected to said supply of frame-scanning current, said halves being interconnected in mutually inverted relationship with reference to the groups of said first coil to generate a supplemental magnetic field having outwardly concave lines of force on opposite sides of said second plane.

Claim 10

A color-television picture tube comprising an envelope provided at one end with a luminescent screen; a source of several parallel coplanar electron beams in said envelope trained upon said screen; and electromagnetic deflecting means for displacing said beam in two orthogonal directions parallel and perpendicular to the plane of said beams, said deflecting means including a first coil connected to a supply of line-scanning current, a second coil coaxial with said first coil connected to a supply of frame-scanning current, and a common toroidal core for said coils; said first coil consisting of wire wound on said core in a single layer of turns distributed in two symmetrical groups about a first diametral plane parallel to the plane of said beams, said groups being separated on opposite sides of a second diametral plane perpendicular to the plane of said beams with generation of a first magnetic field having outwardly convex lines of force on opposite sides of said second plane; said second coil consisting of wire wound on said core in a single layer of turns split into four quadrantal groups separated by Relatively small gaps along said second plane and by relatively large gaps along said first plane with generation of a second magnetic field having outwardly convex lines of force on opposite sides of said first plane, the intensity of said fields being substantially uniform in the region of said beams, the two groups of said first coil being separated along said second plane while overlapping the four groups of said first coil by about 30* per quadrant; said deflecting means further including a third coil coaxially juxtaposed with said core and provided with a winding split into two widely separated halves generally coextensive with the groups of said first coil and connected to said supply of frame-scanning current, said halves being interconnected in mutually inverted relationship with reference to the groups of said first coil to generate a supplemental magnetic field having outwardly concave lines of force on opposite sides of said second plane.