23.
    发明专利
    未知

    公开(公告)号:FI66098B

    公开(公告)日:1984-04-30

    申请号:FI782139

    申请日:1978-07-03

    Applicant: PHILIPS NV

    Abstract: A ring is provided to correct the convergence, color purity and frame errors of a color display tube which ring is magnetized as a multipole and which is secured in or around the tube neck and around the paths of the electron beams. The magnetization of such a ring can best be carried out by energizing a magnetization unit with a combination of direct currents thereby generating a multipole magnetic field and then effecting the magnetization by generating a decaying alternating magnetic field which preferably varies its direction continuously.

    24.
    发明专利
    未知

    公开(公告)号:DE2828710A1

    公开(公告)日:1979-01-11

    申请号:DE2828710

    申请日:1978-06-30

    Applicant: PHILIPS NV

    Abstract: A ring is provided to correct the convergence, color purity and frame errors of a color display tube which ring is magnetized as a multipole and which is secured in or around the tube neck and around the paths of the electron beams. The magnetization of such a ring can best be carried out by energizing a magnetization unit with a combination of direct currents thereby generating a multipole magnetic field and then effecting the magnetization by generating a decaying alternating magnetic field which preferably varies its direction continuously.

    25.
    发明专利
    未知

    公开(公告)号:FI782139A

    公开(公告)日:1979-01-07

    申请号:FI782139

    申请日:1978-07-03

    Applicant: PHILIPS NV

    Abstract: A ring is provided to correct the convergence, color purity and frame errors of a color display tube which ring is magnetized as a multipole and which is secured in or around the tube neck and around the paths of the electron beams. The magnetization of such a ring can best be carried out by energizing a magnetization unit with a combination of direct currents thereby generating a multipole magnetic field and then effecting the magnetization by generating a decaying alternating magnetic field which preferably varies its direction continuously.

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