H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.13
H01J 29/51 (2006.01) H01J 29/56 (2006.01)
Patent
CA 1256931
RCA 82,052 Abstract Of The Disclosure A cathode-ray tube has an inline electron gun comprising three cathodes and a control grid, a screen grid and a main electron beam focusing lens arranged successively in alignment with the cathodes for focusing the electron beams. The screen grid has a functional grid region which includes a center and two outer apertures, an asymmetric beam focusing slot and a refraction lens. The asymmetric beam focusing slot provides a two-part crossover of the electron beams. The refraction lens comprises a transversely disposed recessed portion including a substantially rectangularly-shaped central portion and substantially triangularly-shaped end parts. The refraction lens provides a compensating field between the screen grid and the main electron lens to offset any changes in the main electron lens caused by variations in the focus voltage in the main electron lens. The recessed portion is surrounded by a peripheral rim which conforms to the shape of the recessed portion. The central part of the peripheral rim is remote from the center aperture, and the triangularly-shaped end parts of the rim are in proximity to the outer apertures, thereby affecting the electrostatic field in the vicinity of the outer apertures by tilting the field lines within the recessed portion.
506630
Eckersley Raymond A.
Rca Licensing Corporation
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