Electron optical system with a magnetic focusing and electromagn

Details Electron optical system with a magnetic focusing and electromagn Electron optical system with a magnetic focusing and electromagn

1974-10-15

1976-06-01

Miller, J D

Electric lamp and discharge devices

Cathode ray tube

Image pickup tube

313442, 335210, 335213, H01J 3148, H01H 100

Patent

active

039612198

ABSTRACT:
An electron-optical system with a magnetic focusing and an electromagnetic deflection system of unit design in which a screening means in the form of a coil of magnetic wire or other conventional structure is arranged between the magnetic and electromagnetic units is employed in tubes, in particular high-resolution television camera tubes such as vidicons or the like, having a target for scanning by an electron beam and a fine-mesh field net arranged in front of the target. The focusing coil has an increasing winding density in the direction from the aperture diaphragm toward the target, and the deflection coils are of such short length and arranged either inside or outside of the focusing coil so that, in association with the increasing focusing field strength toward the target due to the use of a deflection field of less than about half the usual extent in the axial direction, the electron beam experiences a rotation of less than 90.degree. in the deflection field while achieving magnification less than unity with low beam landing errors. The focusing coil has an internal and/or external diameter which increases in steps toward the target.

REFERENCES:
patent: 2433682 (1947-12-01), Bradley
patent: 3295010 (1966-12-01), Clayton
patent: 3721931 (1973-03-01), Wharton
patent: 3743983 (1973-07-01), Holman
patent: 3774070 (1973-11-01), Swart
patent: 3811066 (1974-05-01), Holman

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