Dynamic focusing apparatus for cathode-ray tube device

Details Dynamic focusing apparatus for cathode-ray tube device Dynamic focusing apparatus for cathode-ray tube device

1997-11-20

1999-11-09

Westin, Edward P.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

25036821, H01J 2958

Patent

active

059819529

ABSTRACT:
A dynamic focusing apparatus is comprised of a parabaolic voltage generating device for generating a parabolic voltage VpbI across a capacitor 9M by applying a horizontal flyback pulse a series circuit of an inductor 8 and the capacitor, a coupling device 10 for supplying the parabolic voltage to a focus electrode "f" of a cathode-ray tube, the capacitor which includes a plurality of capacitors 9S, an electronic switching device 11 for selectively connecting some of the plurality of capacitors for a time duration corresponding to an approximate center of a horizontal period and for disconnecting the some of the plurality of capacitors for other duration, and a switching control device for controlling the electronic switching device.

REFERENCES:
patent: 4587465 (1986-05-01), Truskalo
patent: 5043638 (1991-08-01), Yamashita
patent: 5466994 (1995-11-01), Akimoto et al.
patent: 5530488 (1996-06-01), Rilly et al.
patent: 5614792 (1997-03-01), Ogishima et al.
patent: 5831400 (1998-11-01), Kim

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