Cathode ray tube including means for vertically extending the sp

Details Cathode ray tube including means for vertically extending the sp Cathode ray tube including means for vertically extending the sp

1990-07-25

1992-04-21

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313426, 313443, H01J 2970

Patent

active

051071711

ABSTRACT:
A cathode ray tube, such as a blue luminescing projection television display tube including, in an evacuated envelope (1), an electron gun (5) for generating an electron beam (6) which is focused to a spot (8) on a display screen (7) by means of an electrostatic focusing lens (27, 30) and which is deflected across this display screen (7) in two mutually perpendicular directions (x, y). A structure (37) magnetized as a four-pole and consisting of a magnetic half-hard material is provided at the area of a focusing lens formed by two electrodes (27, 30) and coaxially around the gun axis (20), the axes of the four-pole being located centrally between the deflection directions. The structure (37) extends the spot in the vertical direction so that phosphor saturation, particularly in blue projection tubes is reduced.

REFERENCES:
patent: 3023336 (1962-02-01), Frenkel
patent: 3881136 (1975-04-01), Scheele
patent: 4377767 (1983-03-01), Kornaker
patent: 4424466 (1984-01-01), Zepperfeld
patent: 4468587 (1984-08-01), Sluyterman

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