Postacceleration cathode ray tube with an electron lens system f

Details Postacceleration cathode ray tube with an electron lens system f Postacceleration cathode ray tube with an electron lens system f

1985-04-24

1986-09-30

Levy, Stewart J.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

315 17, H01J 2980

Patent

active

046148957

ABSTRACT:
A generally box shaped, electronic lens system for use in a cathode ray tube for amplification of both horizontal and vertical deflection of the electron beam. The lens system comprises two or three electrodes arranged in axial alignment, with an insulating gap or gaps therebetween, so as to encompass the beam trajectories from the deflection system to the target of the CRT. The action of the lens system on the beam is divergent in a horizontal direction and convergent in a vertical direction. The target side electrode has its beam exit end closed by an end plate having defined therein an aperture elongated horizontally. The CRT includes a postaccelerating electrode whose field acts on the beam exit end of the lens system, creating an additional lens at the end plate aperture. The vertical dimension of the aperture gradually increases, and then gradually decreases, from the midpoint toward the opposite extremities of its horizontal dimension. So shaped, the end plate aperture serves to amplify beam deflection in the horizontal direction without a sacrifice of linearity.

REFERENCES:
patent: 3496406 (1970-02-01), Deschamps
patent: 4302704 (1981-11-01), Saito
patent: 4543508 (1985-09-01), Saito

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