Space-saving cathode ray tube

A tube comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, and having 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 in said tube neck and 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;
• a plurality of supports attached to the interior of the funnel portion of said tube envelope, at least one of said supports including a resistive voltage divider thereon for providing at least two different potentials;
• and
• at least first and second electrodes mounted to said plurality of supports, each said electrode defining a respective aperture through which the at least one beam of electrons passes, wherein said first and second electrodes are connected to said resistive voltage divider for being biased at the two different potentials provided thereby.

A tube comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, and having 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 in said tube neck and 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;
• a plurality of supports attached to the interior of the funnel portion of said tube envelope, at least one of said supports including a resistive voltage divider thereon for providing at least two different potentials;
• and
• at least first and second electrodes mounted to said plurality of supports, each said electrode defining a respective aperture through which the at least one beam of electrons passes, wherein said first and second electrodes are connected to said resistive voltage divider for being biased at the two different potentials provided thereby,
• wherein said supports comprise a metal layer and a ceramic layer on said metal layer, wherein said first and second electrodes attach to said ceramic layer.

A tube comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, and having 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 in said tube neck and 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;
• a plurality of supports attached to the interior of the funnel portion of said tube envelope, at least one of said supports including a resistive voltage divider thereon for providing at least two different potentials;
• and
• at least first and second electrodes mounted to said plurality of supports, each said electrode defining a respective aperture through which the at least one beam of electrons passes, wherein said first and second electrodes are connected to said resistive voltage divider for being biased at the two different potentials provided thereby,
• wherein said at least one support comprises a metal layer and a ceramic layer oil said metal layer, wherein said resistive voltage divider includes a high-resistivity material on said ceramic layer, and wherein said first and second electrodes electrically connect to said high-resistivity material on said ceramic layer.

A display comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, wherein said faceplate is substantially rectangular having two longer edges and two shorter edges, and having a screen electrode on the faceplate biased at a screen potential;
• a source of at least one beam of electrons directed toward said faceplate, wherein said source is in said tube neck;
• a magnetic deflection yoke proximate said source of at least one beam of electrons for magnetically deflecting 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;
• at least first and second electrodes on an interior surface of the funnel portion of said tube envelope, each said electrodes defining a respective aperture through which the at least one beam of electrons passes, wherein said first electrode is proximal said source and distal said faceplate and is biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said faceplate and is biased at a potential not less than the screen potential;
• a third electrode comprising two formed metal electrodes mounted to said tube envelope and between which the at least one beam of electrons passes, wherein said third electrode is between said second electrode and said faceplate and is biased at a potential not exceeding the screen potential and wherein one of said formed metal electrodes is proximal each of the two shorter sides of said faceplate;
• and
• a source of bias potential for said first, second, third and screen electrodes.

A display comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, and having a screen electrode on the faceplate biased at a screen potential;
• a source of at least one beam of electrons directed toward said faceplate, wherein said source is in said tube neck;
• a magnetic deflection yoke proximate said source of at least one beam of electrons for magnetically deflecting 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;
• a source of bias potential including the screen potential;
• a plurality of supports attached to the interior of the funnel portion of said tube envelope, at least one of said supports including a resistive voltage divider thereon coupled to said source of bias potential for providing at least two different potentials;
• and
• at least first and second electrodes mounted to said plurality of supports, each said electrode defining a respective aperture through which the at least one beam of electrons passes, wherein said first and second electrodes are connected to said resistive voltage divider for being biased at the two different potentials provided thereby.

A display comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, and having a screen electrode on the faceplate biased at a screen potential;
• a source of at least one beam of electrons directed toward said faceplate, wherein said source is in said tube neck;
• a magnetic deflection yoke proximate said source of at least one beam of electrons for magnetically deflecting 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;
• a source of bias potential including the screen potential;
• a plurality of supports attached to the interior of the funnel portion of said tube envelope, at least one of said supports including a resistive voltage divider thereon coupled to said source of bias potential for providing at least two different potentials;
• and
• at least first and second electrodes mounted to said plurality of supports, each said electrode defining a respective aperture through which the at least one beam of electrons passes, wherein said first and second electrodes are connected to said resistive voltage divider for being biased at the two different potentials provided thereby,
• wherein said supports comprise a metal layer and a ceramic layer on said metal layer, and wherein at least one of said supports includes said resistive voltage divider comprising a high-resistivity material on said ceramic layer, and wherein said first and second electrodes electrically connect to said high-resistivity material on said ceramic layer.

A cathode ray tube comprising:

• a tube envelope having a funnel portion, 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 one beam of electrons directed 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;
• 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 electrodes on an interior surface of the funnel portion of said tube envelope, each of said electrodes defining a respective aperture through which the at least one beam of electrons passes, wherein said first electrode is proximal said source and distal said faceplate and is adapted to be biased at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said faceplate and is adapted to be biased at a potential not less than the screen potential;
• and
• a third electrode of formed metal defining an aperture through which the at least one beam of electrons passes, wherein said third electrode is between said second electrode and said faceplate and is adapted to be biased at a potential not exceeding the screen potential,
• whereby the deflected at least one beam of electrons further deflected by at least said second deflection electrode impinge on an area of said screen electrode that is larger than the given area thereof.

A cathode ray tube comprising:

• a tube envelope having a funnel portion, 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 one beam of electrons directed 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;
• phosphorescent material disposed on said faceplate for producing light in response to the at least one beam of electrons impinging thereon;
• and
• a plurality of supports attached to the interior of the funnel portion of said tube envelope, at least one of said supports including a resistive voltage divider thereon for providing at least two different potentials;
• and
• at least first and second electrodes mounted to said plurality of supports, each said electrode defining a respective aperture through which the at least one beam of electrons passes, wherein said first and second electrodes are connected to said resistive voltage divider for being biased at the two different potentials provided thereby,
• whereby the deflected at least one beam of electrons further deflected by at least one of said first and second electrodes impinge on an area of said screen electrode that is at least as large as the given area thereof.

A cathode ray tube comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, wherein said faceplate is substantially flat and rectangular with two longer edges and two shorter edges, and a screen electrode on the faceplate for biasing at a screen potential;
• a source of at least one beam of electrons directed toward the screen electrode on said faceplate, wherein said source is in said tube neck and 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;
• at least a first electrode comprising a conductive coating on an interior surface of the funnel portion of said tube envelope, said first electrode defining an aperture through which the at least one beam of electrons passes, wherein said first electrode is for biasing at a potential not less than the screen potential;
• and
• a second electrode comprising two formed metal electrodes mounted to said tube envelope and between which the at least one beam of electrons passes, wherein one of said formed metal electrodes is proximal each of the two shorter sides of said faceplate between said first electrode and said faceplate and is for biasing at a potential not exceeding the screen potential.

A display comprising:

• a tube envelope having a tube neck, a funnel portion and a faceplate, wherein said faceplate is substantially flat and rectangular with two longer edges and two shorter edges, and having a screen electrode on the faceplate biased at a screen potential;
• a source of at least one beam of electrons directed toward the screen electrode on said faceplate, wherein said source is in said tube neck;
• a magnetic deflection yoke proximate said source of at least one beam of electrons for magnetically deflecting 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;
• at least a first electrode comprising a conductive coating on an interior surface of the funnel portion of said tube envelope, said first electrode defining an aperture through which the at least one beam of electrons passes, wherein said first electrode is proximal said source and distal said faceplate and is biased at a potential not less than the screen potential;
• a second electrode comprising two formed metal electrodes mounted to said tube envelope and between which the at least one beam of electrons passes, wherein said second electrode is between said first electrode and said faceplate and is biased at a potential not exceeding the screen potential and wherein one of said two formed metal electrodes is proximal each of the two shorter sides of said faceplate;
• and
• a source of bias potential for said first, second and screen electrodes.