Cathode-ray tube having asymmetric slots formed in a screen grid

Details Cathode-ray tube having asymmetric slots formed in a screen grid Cathode-ray tube having asymmetric slots formed in a screen grid

1983-05-06

1985-06-11

Demeo, Palmer

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, H01J 2951, H01J 2956

Patent

active

045231230

ABSTRACT:
An inline electron gun for a cathode-ray tube includes a plurality of cathodes, a control grid, a screen grid and a main focus lens arranged successively in alignment with the cathodes for focusing a plurality of electron beams onto a screen. The screen grid has a given thickness with a plurality of transverse slots formed therein. The slots have a depth less than the thickness of the screen grid. An aperture is formed in each of the slots. The outer slots are asymmetric with respect to the apertures therein and are displaced transversely toward the center aperture. The transverse slots in the screen grid compensate for the vertical flare distortion of the beam spot at off-center positions on the screen and the asymmetric location of the outer slots reduces the horizontal convergence sensitivity of the outer beams with respect to focus voltage change.

REFERENCES:
patent: B381074 (1975-01-01), Hasker et al.
patent: 3772554 (1973-11-01), Hughes
patent: 3886081 (1975-02-01), Hasker et al.
patent: 4234814 (1980-11-01), Chen et al.
patent: 4241275 (1980-12-01), Yamauchi
patent: 4242613 (1980-12-01), Brambring et al.
patent: 4251747 (1981-02-01), Burdick
patent: 4272700 (1981-06-01), Collins
patent: 4319163 (1982-03-01), Chen
U.S. patent application Ser. No. 461,584 filed on Jan. 27, 1983 by H. Y. Chen.
U.S. patent application Ser. No. 492,437 filed on May 6, 1983 entitled, "Cathode-Ray Tube Having an Asymmetric Slot Formed in a Screen Grid Electrode of an Inline Electron Gun", filed concurrently herewith by F. van Hekken et al.

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