Space-saving cathode ray tube employing magnetically amplified deflection

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;
• at least first and second magnetic sources each being disposed proximate said tube envelope to produce a respective magnetic field therein, said first and second magnetic sources being disposed oppositely with respect to said source of at least one beam of electrons with said source of at least one beam of electrons between said first and second magnetic sources, the fields of said first and second magnetic sources tending to bend the at least one beam of electrons in a direction away from the center of said faceplate;
• and
• at least third and fourth magnetic sources each producing a respective magnetic field and being disposed proximate said tube envelope, said third magnetic source being disposed intermediate said first magnetic source and said faceplate and said fourth magnetic source being disposed intermediate said second magnetic source and said faceplate, wherein said third and fourth magnetic sources are oppositely 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 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 magnetic sources each being disposed proximate said tube envelope to produce a respective magnetic field therein, said first and second magnetic sources being disposed oppositely with respect to said source of at least one beam of electrons with said source of at least one beam of electrons between said first and second magnetic sources, the fields of said first and second magnetic sources tending to bend the at least one beam of electrons in a direction away from the center of said faceplate;
• and
• an electrode interior said tube envelope and closer to said faceplate than said first and second magnetic sources, said electrode being adapted to be biased at a potential not exceeding the screen potential for producing an electric field in a region through which the at least one beam of electrons passes,
• wherein said electrode includes a plurality of sub-electrodes adapted to be biased at different 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;
• at least a first pair of electromagnets disposed proximate said tube envelope intermediate said source of at least one beam of electrons and said faceplate, wherein said source of at least one beam of electrons is intermediate the electromagnets of said first pair of electromagnets, and wherein said first pair of electromagnets are oppositely poled for tending to bend the at least one beam of electrons in a direction away from the center of said faceplate, thereby to increase the deflection thereof;
• and
• an electrode interior said tube envelope and closer to said faceplate than said first pair of electromagnets, said electrode being adapted to be biased at a potential not exceeding the screen potential for producing an electric field in a region through which the at least one beam of electrons when bent by said at least first pair of electromagnets in a direction away from the center of the faceplate passes for tending to bend the at least one beam of electrons in a direction toward said faceplate,
• whereby the beam of electrons is bent in a direction away from the center of the faceplate to increase the deflection thereof and is then bent in a direction toward the faceplate to increase the landing angle thereof on the faceplate.

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;
• at least a first pair of electromagnets disposed proximate said tube envelope intermediate said source of at least one beam of electrons and said faceplate, wherein said source of at least one beam of electrons is intermediate the electromagnets of said first pair of electromagnets, and wherein said first pair of electromagnets are oppositely poled for tending to bend the at least one beam of electrons in a direction toward said faceplate;
• and
• an electrode interior said tube envelope and farther from said faceplate than said first pair of electromagnets, 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 away from the center of 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, and having a tube neck opposite said faceplate, wherein said faceplate has a longer dimension and a shorter dimension;
• 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 impinges upon a given portion of the 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 electromagnets mounted on said tube envelope, each intermediate said source of at least one beam of electrons and said faceplate, said first electromagnet being positioned diametrically opposite said second electromagnet, wherein said first and second electromagnets are oppositely poled for deflecting the at least one beam of electrons in a direction away from the center of said faceplate in the longer dimension thereof,
• whereby the deflected at least one beam of electrons further deflected by at least said first and second electromagnets impinge on an area of said screen electrode that is larger than the given portion thereof.

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, and having a tube neck opposite said faceplate disposed along a central axis substantially perpendicular to said faceplate, wherein said faceplate has a longer dimension and a shorter dimension;
• 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 portion of the 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 pairs of magnetic sources substantially symmetrically mounted on said tube envelope with respect to said central tube axis, each pair of magnetic sources being intermediate said source of at least one beam of electrons and said faceplate, the first magnetic source of each pair of magnetic sources being positioned diametrically opposite the second magnetic source of said pair, wherein said first and second pairs of magnetic sources are oppositely poled for said first pair of magnetic sources deflecting the at least one beam of electrons in a direction away from the center of said faceplate in the longer dimension thereof and for said second pair of magnetic sources deflecting the at least one beam of electrons in a direction toward said faceplate,
• whereby the deflected at least one beam of electrons further deflected by at least said first and second pairs of magnetic sources impinge on an area of said screen electrode that is larger than the given portion thereof.

A display comprising:

• a tube envelope having a faceplate and a screen electrode on the faceplate biased at a screen potential, wherein the faceplate has a larger dimension and a shorter dimension;
• 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;
• 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 electromagnets disposed proximate said tube envelope with said source of at least one beam of electrons intermediate said first and second electromagnets, wherein said first and second electromagnets are oppositely poled for tending to bend the at least one beam of electrons in a direction away from the center of said faceplate in the larger dimension thereof;
• and
• a source of direct current bias for said first and second electromagnets 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 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;
• 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 electromagnets disposed proximate said tube envelope with said source of at least one beam of electrons intermediate said first and second electromagnets, wherein said first and second electromagnets are oppositely poled for tending to bend the at least one beam of electrons in a direction away from the center of said faceplate;
• at least third and fourth electromagnets disposed proximate said tube envelope intermediate said first and second electromagnets and said faceplate, wherein said third and fourth electromagnets are oppositely poled for tending to bend the at least one beam of electrons in a direction toward said faceplate:
• and
• a source of direct current bias for said first, second, third and fourth electromagnets and of bias potential for said screen electrode.