Electron lens system for deflection amplification in a cathode-r

Details Electron lens system for deflection amplification in a cathode-r Electron lens system for deflection amplification in a cathode-r

1987-04-16

1988-06-28

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313432, 315 17, H01J 2980, H01J 2970

Patent

active

047541911

ABSTRACT:
A generally box-shaped electron lens system for use in an oscilloscopic or storage cathode-ray tube for the amplification of both vertical and horizontal deflections of the electron beam from the gun to the target of the CRT. The lens system comprises two electrodes at least partly displaced from each other along the CRT tube axis, with a gap therebetween for electrically insulating one from the other. A pair of tongues extend either from the gun-side electrode into the target-side electrode, or from the target-side electrode into the gun-side electrode, or two such pairs of tongues extend from both electrodes into interdigitating relation to each other. Upon application of prescribed potentials to the two electrodes, a quadrupolar lens field is created in the space between the pair or pairs of tongues for deflection amplification in both directions. On having been deflected vertically, the beam has its deflection amplified by having its traveling direction inverted with respect to the tube axis. The beam that has been deflected horizontally has its deflection magnified without having its traveling direction inverted.

REFERENCES:
patent: 4302704 (1981-11-01), Saito
patent: 4543508 (1985-09-01), Saito
patent: 4614895 (1986-09-01), Saito et al.
patent: 4623819 (1986-11-01), Janko et al.

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