Asymmetric space-saving cathode ray tube with magnetically deflected electron beam

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 away from said faceplate, wherein said source is adapted for scanning 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 a first magnetic source disposed proximate said tube envelope to produce a magnetic field therein for tending to bend the at least one beam of electrons in a direction towards said faceplate;
• at least a second magnetic source disposed proximate said tube envelope for producing a magnetic field therein for tending to bend the at least one beam of electrons in a direction towards said faceplate, wherein said second magnetic source is intermediate said first magnetic source and said faceplate;
• and
• at least a third magnetic source disposed proximate said tube envelope for producing a magnetic field therein for tending to bend the at least one beam of electrons in a direction toward said faceplate, wherein said third magnetic source is intermediate said second magnetic source and said faceplate.

A tube comprising:

• a tube envelope having a faceplate, a backplate opposite the 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 away from said faceplate, wherein said source is adapted for scanning 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 electromagnets disposed proximate the backplate of said tube envelope intermediate said source of at least one beam of electrons and said faceplate, wherein said first and second electromagnets are poled to produce a magnetic field in a volume between the backplate and the screen electrode for tending to bend the at least one beam of electrons in a direction towards said faceplate.

A tube comprising:

• a tube envelope having a faceplate, a backplate opposite the 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 away from said faceplate, wherein said source is adapted for scanning 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 electromagnet disposed proximate the backplate of said tube envelope intermediate said source of at least one beam of electrons and said faceplate, and wherein said first electromagnet is poled to produce a magnetic field in a volume between the backplate and the screen electrode for tending to bend the at least one beam of electrons in a direction toward said faceplate;
• and
• at least one electrode interior said tube envelope and positioned one of nearer to and farther from said faceplate than said first electromagnet, said electrode being adapted to be biased at a potential not less than screen potential for producing an electric field in a region through which the at least one beam of electrons passes for tending to bend the at least one beam of electrons in a direction toward said faceplate.

A 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, having a backplate opposite the faceplate and having a tube neck adjacent said faceplate;
• in said tube neck, a source of at least one beam of electrons directed away from said faceplate, wherein said source is adapted for scanning 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;
• phosphorescent material disposed on said faceplate for producing light in response to the at least one beam of electrons impinging thereon;
• and
• at least one magnetic source mounted on an exterior surface of the backplate of said tube envelope intermediate said source of at least one beam of electrons and said faceplate, wherein said magnetic source produces a magnetic field in a volume between the backplate and the screen electrode for deflecting the at least one beam of electrons in a direction towards said faceplate;
• and
• at least one static deflection element mounted on said tube envelope one of nearer to and farther from said faceplate than said magnetic source, said static deflection element being biased for deflecting said at least one beam of electrons towards said faceplate,
• whereby the deflected at least one beam of electrons further deflected by at least one of said magnetic source and said static deflection element impinges on an area of said faceplate.

A display comprising:

• a tube envelope having a faceplate, a backplate opposite the 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 away from 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;
• 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 electromagnet disposed proximate the backplate of said tube envelope intermediate said source of at least one beam of electrons and said faceplate, wherein said at least first electromagnet is poled to produce a magnetic field in a volume between the backplate and the screen electrode for tending to bend the at least one beam of electrons in a direction towards said faceplate;
• and
• a source of direct current bias for said at least first electromagnet and of bias potential for said screen electrode.

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 away from 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;
• 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 electromagnet disposed proximate said tube envelope intermediate said source of at least one beam of electrons and said faceplate, wherein said at least first electromagnet is poled for tending to bend the at least one beam of electrons in a direction towards said faceplate;
• and
• a source of direct current bias for said at least first electromagnet and of bias potential for said screen electrode;
• at least a second electromagnet disposed proximate said tube envelope intermediate said first electromagnet and said faceplate, wherein said second electromagnet is poled for tending to bend the at least one beam of electrons in a direction toward said faceplate;
• and
• at least a third electromagnet disposed proximate said tube envelope intermediate said second electromagnet and said faceplate, wherein said third electromagnet is poled for tending to bend the at least one beam of electrons in a direction toward said faceplate.

A tube comprising:

• a tube envelope having a faceplate, having a back plate opposing the faceplate, and having a screen electrode on the faceplate adapted to be biased at a screen potential;
• a source of plural beams of electrons directed away from said faceplate and toward said backplate, wherein said source is adapted for scanning deflection of said plural beams of electrons;
• phosphorescent material disposed on said faceplate for producing light in response to the plural beams of electrons impinging thereon;
• a first magnetic source disposed proximate the backplate of said tube envelope to produce a magnetic field between the faceplate and the backplate for bending the plural beams of electrons in a direction towards said faceplate;
• and
• a second magnetic source disposed proximate the backplate of said tube envelope for producing a magnetic field between the faceplate and the backplate for bending the plural beams of electrons in a direction towards said faceplate, wherein said second magnetic source is intermediate said first magnetic source and said source.

A tube comprising:

• a faceplate having a near edge and a far edge,
• a screen electrode on said faceplate adapted to be biased at a screen potential;
• phosphorescent material disposed on said faceplate for producing light in response to electrons impinging thereon;
• a tube envelope joined to said faceplate at least at the near and the far edges thereof,
• wherein the joined tube envelope and faceplate define a tube volume therebetween;
• a source of at least one beam of electrons disposed proximate the near edge of said faceplate, wherein the at least one beam of electrons is directed into the tube volume in a direction away from said faceplate;
• means for scanning deflection of the at least one beam of electrons within the tube volume;
• a first magnetic source disposed proximate said tube envelope and relatively distal the near edge of said faceplate for providing a magnetic field within the tube volume between the near and far edges of said faceplate for bending the at least one beam of electrons within the tube volume in a direction towards said faceplate;
• and
• a second magnetic source disposed proximate said tube envelope and relatively proximal the near edge of said faceplate for providing a magnetic field within the tube volume between the near and far edges of said faceplate for bending the at least one beam of electrons within the tube volume in a direction towards said faceplate,
• whereby the scanningly deflected beam of electrons are deflected by the first and second magnetic sources to be directed towards the faceplate to impinge upon the phosphorescent material thereon.