Postacceleration cathode ray tube with a scan expansion lens

Details Postacceleration cathode ray tube with a scan expansion lens Postacceleration cathode ray tube with a scan expansion lens

1979-10-05

1981-11-24

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313429, H01J 2970

Patent

active

043027040

ABSTRACT:
A trapezoidal or rectangular box-shaped lens is incorporated, in combination with a postaccelerating electrode, in a cathode ray tube for amplification of beam deflections in both horizontal and vertical directions. Basically the lens comprises three lens elements or electrodes arranged end-to-end, with insulating gaps therebetween, so as to encompass the trajectories of the electron beam from the deflection system to the target of the CRT. For improvement of display characteristics the adjacent ends of not only the top and bottom sides, but also the right and left sides, of the electrodes of the lens system are oppositely curved to arcs that are convexed in prescribed directions. An end plate at the beam exit end of the target-side electrode has formed therein an elongate aperture extending in one of the orthogonal directions of beam deflection. The lens system provides a divergent action in one of the orthogonal directions and a doubly convergent action in the other.

REFERENCES:
patent: 2412687 (1946-12-01), Klemperer
patent: 3496406 (1970-02-01), Deschamps
patent: 4142128 (1979-02-01), Odenthal
Box lens design being tried by Tektronix in experimental CRTs, Electronics, pp. 50 & 52, May 26, 1977.

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