Beam-index tube apparatus having deflection field correcting ele

Details Beam-index tube apparatus having deflection field correcting ele Beam-index tube apparatus having deflection field correcting ele

1978-06-05

1980-04-08

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 12ND, 335212, H01J 2956

Patent

active

041974875

ABSTRACT:
A beam-index tube apparatus comprising a beam-index picture tube provided with an electron gun to generate an electron beam of an oval cross-section, a deflecting device having a deflecting yoke for deflecting the electron beam, and correcting elements provided in the proximity of a front end of the deflecting yoke and positioned corresponding to the horizontal axis and the diagonal axes of the picture tube. The correcting elements act upon the electron beam in a manner such that the rotating of the diagonally deflected electron beam and widening of the horizontally deflected electron beam are thereby corrected.

REFERENCES:
patent: 3371206 (1968-02-01), Takizawa

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