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US 6,369,498 B1Granted
Electron gun for addressing secondary emission targets
AssigneeIntel Corporation
InventorThomas A. Skupien
Life of this patent
Estimating the term…
Abstract
A dual-gun, single neck CRT focuses two beams, with significantly differing energies, onto a secondary emission target while maintaining compatibility with a standard fourteen-rotation stem and achieving FTU in excess of 95%. A pair of Einzel guns (write and erase) are mounted in parallel and aligned in the vertical direction rather than the horizontal inside the CRT. The write and erase guns are configured to share a common second accelerator electrode, a common final accelerator electrode, mounting beads and a magnetic deflection yoke. The guns' focus voltages are independently adjusted so that both the write and erase beams have the same focal length.
Claims14
A CRT, comprising:
- a single neck;
- a stem in the neck having an isolated high voltage pin and multiple low voltage pins;
- a funnel attached to the neck;
- a target on the end of the funnel;
- a write gun in the neck including a triode that forms a write beam and a focusing lens having an anode electrode and a focus electrode that together focus the write beam onto the target;
- and
- an erase gun in the neck including a triode that forms an erase beam and a focusing lens having an anode electrode and a focus electrode that together focus the erase beam onto the target, said write and erase guns sharing a common anode electrode but having separate triodes that are biased with respect to each other such the landing energy of the write and erase beams are different and having separate focus electrodes whose voltages are independently controlled to focus the write and erase beams at the target.
4 more elements
A CRT, comprising:
- a single neck;
- a stem in the neck having an isolated high voltage pin and multiple low voltage pins;
- a funnel attached to the neck;
- a target on the end of the funnel, the target having an addressing surface that is characterized by a secondary electron emission curve at which the surface exhibits an emission coefficient greater than one for beam landing energies between first and second crossover points on the curve and exhibits an emission coefficient less than one for beam landing energies above the second crossover points;
- an Einzel write gun in the neck including a triode that forms a write beam that scans the target horizontally and a focusing lens having an anode electrode and a focus electrode that together focus the write beam onto the target;
- and
- an Einzel erase gun positioned in vertical alignment a with the write erase in the neck, the erase including a triode that forms an erase beam that scans the target horizontally and a focusing lens having an anode electrode and a focus electrode that together focus the erase beam onto the target, said write and erase guns sharing a common anode electrode but having separate triodes that are biased with respect to each other such the landing energy of the write and erase beams lie on opposite sides of the second crossover point and having separate focus electrodes whose voltages are independently controlled to focus the write and erase beams at the target.
4 more elements
A CRT, comprising:
- a single neck;
- a standard color CRT 14-position stem in the neck having an isolated high voltage pin, two blank pin locations on either side of the high voltage pin and nine low voltage pins;
- a funnel attached to the neck;
- a target on the end of the funnel;
- an Einzel write gun in the neck including a triode that forms a write beam that scans the target horizontally and a focusing lens having an anode electrode and a focus electrode that together focus the write beam onto the target;
- and
- an Einzel erase gun positioned in vertical alignment with the write erase in the neck, the erase including a triode that forms an erase beam that scans the target horizontally and a focusing lens having an anode electrode and a focus electrode that together focus the erase beam onto the target, said write and erase guns sharing a common anode electrode but having separate triodes that are biased with respect to each other such the landing energy of the write and erase beams are different and having separate focus electrodes whose voltages are independently controlled to focus the write and erase beams at the target.
4 more elements
Dependencies are inferred from the claim text.