Electron gun having improved focus and convergence, and color ca

Details Electron gun having improved focus and convergence, and color ca Electron gun having improved focus and convergence, and color ca

1996-05-21

1998-03-17

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 14, 313414, H01J 2958

Patent

active

057290997

ABSTRACT:
In an electron gun, and a color cathode-ray tube and an image display device using the electron gun, each of two pairs of convergence electrodes is disposed in a focusing electrode for focusing three electron beams in a manner to pass the respective side beam of the three electron beams. Since an alternating current voltage synchronized with a deflection current is superposed to one of each pair of the convergence electrodes, such forces are exerted to the side beams as to separate the side beams from each other in the vicinity of the peripheral edge of a screen having a fluorescent body, so that the converging point of the electron beams is positioned on the screen. The focusing function of a main electron lens is weakened in the vicinity of the peripheral edge of the screen, whereby the electron beams are correctly focused.

REFERENCES:
patent: 4498026 (1985-02-01), Yamauchi et al.
patent: 4771216 (1988-09-01), Blacker et al.
patent: 4772827 (1988-09-01), Osakabe
patent: 4886999 (1989-12-01), Yamane et al.
patent: 4899091 (1990-02-01), Odenthal
patent: 4940917 (1990-07-01), Stil
patent: 5015910 (1991-05-01), Takahashi et al.

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