Patent · US Expired

In-line color picture tube

US5148081A · kind A · utility

0Cited by

2References

20Claims

0Family size

Assignee

Nokia Unterhaltungselektronik GmbH · DE

Inventors

Werner Neumann · Owingen, DE
Hans Reule · Wissen, DE
Werner Wolffram · Owen, DE

Key dates

Filing date	Feb 28, 1991
Grant date	Sep 15, 1992
Priority date	—
Expiry date	Feb 28, 2011

Classification

Technology area (CPC H)Electricity
CPC primaryH01J2229/4875
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To prevent the formation of a corona (2) in a known in-line color picture tube with an automatic-focusing deflection system and four grids (G1-G4), a rectangular opening is provided on the side of the second grid (G2) facing the first grid (G1). As a result, the luminous spot (1) formed by the electron beam at the center of the screen is converted to a vertical ellipse and the ratio of the axes of the lateral ellipses on the edge of the image is reduced, thus improving the sharpness of the edges. The openings (5) in the first grid (G1) are elongated in the in-line direction, in particular rectangular, the adjacent openings of the second grid (G2) are also rectangular and all the other openings in the other grids (G2, G3, G4) are circular. In this way, the ratio of the axes of the luminous elliptical spot (11) produced by the electron beam at the center of the screen is reduced without adversely affecting the sharpness of the edges.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.