Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1992-06-01
1993-08-31
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 315 15, H01J 2948
Patent
active
052412407
ABSTRACT:
An inline electron gun for use in a multi-beam color cathode ray tube (CRT) has a main focus lens for focusing the electron beams on a display screen of the CRT. The main focus lens includes adjacent charged electrodes each having chain link-type common lens apertures through which the electron beams are directed and which are in facing relation for reducing horizontal spherical aberration of the electron beams on the CRT display screen, where each common lens aperture has a longitudinal axis aligned with the inline electron beams. Each common lens aperture includes spaced, vertically enlarged portions, each aligned with a respective electron beam, for correcting for vertical spherical aberration of the electron beams. Increasing the vertical dimension of that portion of each of the common lens apertures aligned with a respective electron beam reduces the vertical spot size of the electron beam without degrading other electron gun operating characteristics. The chain link-type common lens is defined by a thin peripheral side wall parallel to the beam axis which may also be used in other embodiments such as in combination with facing conventional solid (double side wall) or hollow (single side wall) common lens structures in adjacent electrodes in the main focus lens. The chain link-type common lens aperture may be either disposed in an inwardly directed end wall of the electrode or it may be defined by a straight side wall of the electrode aligned with the electron gun axis.
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Chen Hsing-Yao
Tsai Sen-Su
Chunghwa Picture Tubes Ltd.
O'Shea Sandra L.
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