Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1987-11-02
1988-06-28
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313449, H01J 2951
Patent
active
047541890
ABSTRACT:
A color television display tube comprising an electron gun system (5) of the "in-line" type and an electromagnetic deflection unit. The end of the electron gun system is provided with field shapers comprising, for example, annular elements (34,34') of a material having a high magnetic permeability which are positioned around the two outer beams and are adapted to compensate coma. These elements are located in a more advanced position towards the screen than is usual, in positions where the outer beams have undergone a pre-deflection of at least 0.5 mm so as to reduce the "green droop" (anisotropic Y-coma) and to reduce the need for a negative 6-polefield. For example, the elements (34, 34') may be located "above" the bottom of the centering bush (28), or the distance between a focusing lens of the electron gun and elements (34, 34') may be more than 10 mm, or the axial position of the elements(34, 34') may coincides with the axial beginning of the turns on the line deflection coil, or the axial beginning may be located closer to the display screen.
REFERENCES:
patent: 4196370 (1980-04-01), Hughes
patent: 4396862 (1983-08-01), Hughes
Kraus Robert J.
Moore David K.
U.S. Philips Corporation
Wieder K.
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