Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1993-07-19
1995-02-28
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 313447, 313460, 445 34, H01J 2951
Patent
active
053940547
ABSTRACT:
An electron gun such as used in a cathode ray tube (CRT) includes an Einzel lens having charged G3, G4 and G5 grids for focusing an electron beam on the CRT's display screen. The G3, G4 and G5 grids are cylindrical and have the same inner diameter, with their respective longitudinal axes colinear and aligned with the electron beam axis. Where T is the thickness of a grid and L is the G3-G4 or G4-G5 spacing, or gap, shielding against stray electrostatic fields within the grids arising from stray electrons on either a grid-supporting glass bead or on the inner surface of the CRT's neck portion is provided by maintaining the relationship 3.0.gtoreq.T/L.gtoreq.0.75. Another embodiment employs thinner grids having a thickness t with outward turned end flanges, or folded edges, disposed about facing edges of adjacent grids having a thickness T, where T>t and the above-stated relationship of T/L is maintained. A common inner diameter of each grid facilitates alignment of the grids using a cylindrical mandrel disposed within and supporting the grids during electron gun assembly.
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Chen Hsing-Yao
Tsai Sen-Su
Chunghwa Picture Tubes Ltd.
O'Shea Sandra L.
Patel Vip
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