Multistep focusing electron gun for cathode ray tube

Details Multistep focusing electron gun for cathode ray tube Multistep focusing electron gun for cathode ray tube

1990-12-31

1992-06-30

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313413, 313444, H01J 2948, H01J 2950, H01J 2951

Patent

active

051266253

ABSTRACT:
A multistep focusing electron gun for a cathode ray tube includes at least a unipotential auxiliary lens and a bipotential major lens, wherein the electron beam-passing hole of the middle electrode supplied with a low potential among a successive three electrodes forming the unipotential auxiliary lens is formed in the form of a square and has a size so that the electron beam-passing holes of the electrode disposed at the front and at the rear of the middle electrode can be inscribed. The intensity of the unipotential auxiliary lens is weakened without reducing the mechanical strength of the electrode, and also the change of the relative position between the electrodes resulted from the structure change is inhibited.

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