Claims
- 1. A color display tube comprising an envelope containing a display screen and an electron gun system for producing in-line electron beams and for directing said beams toward said screen, said electron gun system including a triode part for producing the electron beams and focusing electrode means for focusing said beams at the screen, characterized in that said triode part comprises:
- a. central and first and second outer cathodes for emitting electrons;
- b. a first electrode disposed adjacent the cathodes and having central and first and second outer apertures for passing electrons emitted by the respective cathodes; and
- c. a second electrode including an apertured portion disposed opposite the first electrode;
- said first electrode having its apertures dimensioned and arranged with respect to the cathodes to effect formation of the electrons emitted by the cathodes into two outer electron beams and one inner electron beam, each beam having a crossover occurring in the area of the apertured portion of the second electrode; and
- said second electrode portion having a central aperture dimensioned and arranged with respect to the central aperture in the first electrode for producing therebetween a localized electron field lens which effects passage of the central electron beam without deflection, and having first and second outer apertures, each being dimensioned and arranged eccentrically with respect to the corresponding aperture in the first electrode for producing therebetween a localized electron lens field which effects deflection of the respective electron beam, substantially in the area of the crossover, toward convergence with the inner electron beam at the screen.
- 2. A color display tube comprising an envelope containing a display screen and an electron gun system for producing in-line electron beams and for directing said beams toward said screen, said electron gun system including a triode part for producing the electron beams and focusing electrode means for focusing said beams at the screen, characterized in that said triode part comprises:
- a. central and first and second outer cathodes for emitting electrons;
- b. a first electrode disposed adjacent the cathodes and having central and first and second outer apertures for passing electrons emitted by the respective cathodes;
- c. a second electrode including electrically connected, apertured, spaced-apart first and second electrode elements for passing the electrons from the apertures in the first electrode;
- said first electrode having its apertures dimensioned and arranged with respect to the cathodes to effect formation of the electrons emitted by the cathodes into two outer electron beams and one inner electron beam, each beam having a crossover occurring in the area of the first electrode element;
- said first electrode element being disposed opposite the first electrode, having a central aperture dimensioned and arranged with respect to the central aperture in the first electrode for producing therebetween a localized electron field lens which effects passage of the central electron beam without deflection, and having first and second outer apertures, each being dimensioned and arranged eccentrically with respect to the corresponding aperture in the first electrode for producing therebetween a localized electron lens field which effects deflection of the respective electron beam, substantially in the area of the crossover, toward convergence with the inner electron beam at the screen; and
- said second electrode element having a central aperture arranged symmetrically with respect to the central aperture in the first electrode element, and having first and second outer apertures, each being dimensioned and arranged eccentrically with respect to the corresponding aperture in the first electrode element.
- 3. A color display tube as in claim 2 where the second electrode comprises a beaker-shaped member having an open end and a closed end, a first plate member attached to an inner surface of the closed end and a second plate member attached to the open end,
- said closed end including central and first and second outer apertures which are disposed opposite and aligned with the apertures in the first electrode;
- said first plate member forming the first electrode element and including said central and first and second outer apertures of said first electrode element; and
- said second plate member forming the second electrode element and including said central and first and second outer apertures of said second electrode element.
- 4. A color display tube as in claim 2 where the second electrode comprises a beaker-shaped member having an open end and a closed end, and a plate member attached to the open end;
- said closed end forming the first electrode element and including said central and first and second outer apertures of said first electrode element; and
- said plate member forming the second electrode element and including said central and first and second outer apertures of said second electrode element.
- 5. A color display tube as in claim 1, 2, 3 or 4 where the focusing electrode means includes at least three focusing electrodes, each having respective openings for passing the inner electron beam and the deflected outer electron beams, the openings for the outer electron beams being situated such that said beams pass centrally therethrough.
- 6. A color display tube as in claim 5 where the successive focusing electrodes through which the electron beams pass have successively larger openings.
- 7. A color display tube comprising an envelope containing a display screen and an electron gun system for producing in-line electron beams and for directing said beams toward said screen, said electron gun system including a triode part for producing the electron beams and apertured focusing electrode means for focusing said beams at the screen, characterized in that said triode part comprises:
- a. central and first and second outer cathodes for emitting electrons;
- b. a first electrode disposed adjacent the cathodes and having central and first and second outer apertures for passing electrons emitted by the respective cathodes;
- said first electrode having its apertures dimensioned and arranged with respect to the cathodes to effect formation of the electrons emitted by the cathodes into two outer electron beams and one inner electron beam; and
- c. a second electrode including at least one apertured portion having central and first and second outer apertures for passing the respective electron beams;
- said second electrode having each of its outer apertures dimensioned and arranged with respect to the respective apertures in the first electrode and in the focusing electrode means to produce localized electron field lenses for effecting both crossover and convergence deflection of the respective outer electron beam in the area of said second electrode aperture.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8102526 |
May 1981 |
NLX |
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Parent Case Info
This is a continuation of application Ser. No. 370,430, filed Apr. 21, 1982, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
370430 |
Apr 1982 |
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