Colour television display tube with coma correction

Details Colour television display tube with coma correction Colour television display tube with coma correction

H - Electricity

01

J

313/35.1204, 313

H01J 29/50 (2006.01) H01J 29/70 (2006.01)

Patent

CA 1265839

ABSTRACT Colour television display tube with coma correction. Colour television display tube comprising an electron gun system (5) of the "in-line" type and an electromagnetic deflection unit. The extremity 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 of a negative field 6-pole. It is, for example, a characteristic feature that the elements (34,34') are present "above" the bottom of the centring bush (28), or the fact that the distance between focusing gap of the electron gun and elements (34,34') is more than 10 mm, or the fact that the axial position of the elements (34,34') coincides with the axial beginning of the turns on the line deflection coil, or with respect to the axial beginning is located closer to the display screen.

511098

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