Bi-potential electrode space-saving cathode ray tube

A bi-potential cathode ray tube comprising:

• a tube envelope having a generally flat faceplate and a screen electrode on the faceplate adapted to be biased at a screen potential, and having a tube neck opposite said faceplate;
• in said tube neck, a source of at least two beams of electrons directed toward said faceplate, wherein said source is adapted for magnetic deflection of said at least two beams of electrons;
• a deflection yoke around said tube neck for deflecting the at least two beams of electrons from said source over a predetermined range of deflection angles, whereby the deflected at least two beams of electrons impinge upon a given area of the screen electrode;
• phosphorescent material disposed on said faceplate for producing light in response to the beam of electrons impinging thereon;
• and
• at least first and second electrostatic electrodes interior said tube envelope and defining a non-Z-planar gap therebetween, wherein said first electrode is proximate said source and adapted to be biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said screen electrode and is adapted to be biased at said screen potential.

A display comprising:

• a tube envelope having a faceplate and a screen electrode on the faceplate biased at a screen potential;
• a source within said tube envelope of at least one beam of electrons directed toward said faceplate;
• a deflection yoke proximate said source of at least one beam of electrons for magnetically deflecting said at least one beam of electrons, said deflection yoke defining a deflection plane;
• phosphorescent material disposed on said faceplate for producing light in response to the at least one beam of electrons impinging thereon;
• at least first and second electrostatic electrodes interior said tube envelope defining a gap therebetween that intersects the deflection plane and is partly disposed on one side thereof and partly to the other side thereof, wherein said first electrode is proximate said source of at least one beam of electrons and biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said screen electrode and is biased at said screen potential;
• and
• a source of potential providing the first and screen potentials.

A tube comprising:

• a tube envelope having a faceplate and a screen electrode on the faceplate adapted to be biased at a screen potential;
• a source of at least one beam of electrons directed toward said faceplate, wherein said source is adapted for magnetic deflection of said at least one beam of electrons;
• phosphorescent material disposed on said faceplate for producing light in response to the at least one beam of electrons impinging thereon;
• and
• at least first and second electrostatic electrodes on an interior surface of said tube envelope and defining an elongated non-Z-planar gap therebetween, wherein said first electrode is proximate said source and adapted to be biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said screen electrode and is adapted to be biased at the screen potential.

A bi-potential cathode ray tube comprising:

• a tube envelope having a generally flat faceplate forward and a screen electrode on the faceplate adapted to be biased at a screen potential, and having a tube neck rearward opposite said faceplate;
• in said tube neck, a source of at least one beam of electrons directed forward toward said faceplate, wherein said source is adapted for magnetic deflection of said at least one beam of electrons;
• a deflection yoke around said tube neck for deflecting the at least one beam of electrons from said source over a predetermined range of deflection angles, whereby the deflected at least one beam of electrons impinge upon a given area of the screen electrode, said deflection yoke defining a forward deflection plane;
• phosphorescent material disposed on said faceplate for producing light in response to the beam of electrons impinging thereon;
• and
• at least first and second electrostatic electrodes interior said tube envelope and defining a gap therebetween, wherein said first electrode is rearward proximate said source and adapted to be biased at a potential less than the screen potential, wherein said second electrode is forward between said first electrode and said screen electrode and is adapted to be biased at said screen potential, and wherein the gap is partly forward and partly rearward of the forward deflection plane.

A plural-beam tube comprising:

• a tube envelope having a faceplate and a screen electrode on the faceplate adapted to be biased at a screen potential, said tube envelope defining an axis and a plane perpendicular to the axis;
• a source of at least two beams of electrons directed generally along the axis toward said faceplate, wherein said source is adapted for magnetic deflection of said at least two beams of electrons away from the axis;
• phosphorescent material disposed on said faceplate for producing light in response to the at least two beams of electrons impinging thereon;
• and
• at least first and second electrostatic electrodes on an interior surface of said tube envelope and each having an edge defining a gap therebetween on the interior surface of said tube envelope,
• wherein said first electrode is proximate said source and adapted to be biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said screen electrode and is adapted to be biased at the screen potential, and
• wherein a portion of the edge of each of the at least first and second electrodes is disposed closer toward the faceplate than the plane perpendicular to the axis and another portion of the edge of each of the at least first and second electrodes is disposed closer toward the source than the plane perpendicular to the axis.

A bi-potential cathode ray tube comprising:

• a tube envelope having a generally flat faceplate and a screen electrode on the faceplate adapted to be biased at a screen potential, and having a tube neck opposite said faceplate, said tube envelope defining a central axis extending from the tube neck to the faceplate, and defining a given plane perpendicular to the central axis;
• in said tube neck, a source of at least two beams of electrons directed generally in a direction along the central axis toward said faceplate, wherein said source is adapted for magnetic deflection of said at least two beams of electrons;
• a deflection yoke around said tube neck for deflecting the at least two beams of electrons from said source over a predetermined range of deflection angles, whereby the deflected at least two beams of electrons impinge upon a given area of the screen electrode;
• phosphorescent material disposed on said faceplate for producing light in response to the beam of electrons impinging thereon;
• and
• at least first and second electrostatic electrodes interior said tube envelope and having respective edges defining a gap therebetween, wherein said first electrode is proximate said source and adapted to be biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said screen electrode and is adapted to be biased at said screen potential, and
• wherein a portion of the edge of each of the at least first and second electrostatic electrodes is disposed closer toward the faceplate than the given plane and another portion of the edge of each of the at least first and second electrodes is disposed closer toward the source than the given plane.

A tube comprising:

• a tube envelope having a faceplate and a screen electrode on the faceplate adapted to be biased at a screen potential;
• a source of at least one beam of electrons directed generally along a tube axis toward said faceplate, wherein said source is adapted for magnetic deflection of said at least one beam of electrons;
• phosphorescent material disposed on said faceplate for producing light in response to the at least one beam of electrons impinging thereon;
• and
• first and second electrostatic electrodes on an interior surface of said tube envelope and having respective edges defining an elongated gap therebetween, wherein said first electrode is proximate said source and adapted to be biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said screen electrode and is adapted to be biased at the screen potential, and
• wherein a portion of the edge of each of the first and second electrostatic electrodes is disposed closer toward the faceplate than a given plane that is perpendicular to the tube axis and another portion of the edge of each of the first and second electrodes is disposed closer toward the source than the given plane.