Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1987-06-05
1989-02-28
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313429, 313434, H01J 2970
Patent
active
048088790
ABSTRACT:
An acceleration and scan expansion lens system for use in an electron discharge tube provides scan expanion in which the amount of scan expansion provided in the horizontal direction is independent of the amount of scan expansion provided in the vertical direction. In a preferred embodiment, the lens system (10) is employed in a cathode-ray tube (12) which has greater deflection sensitivity in the vertical direction than in the horizontal direction. The lens system includes a mesh electrode structure (62) that has a dome-shaped mesh element (66) which is supported by an electrically connected to a metallic cylindrical support element (70). The dome-shaped mesh element is formed to have a concave surface as viewed in the propagation direction (35) of the electron beam and is of rotationally symmetric shape. The lens system also includes an annular electrode element (64) that has an aperture of elliptical shape and is positioned adjacent the output end of the mesh electrode structure. The major and minor axes (74 and 76) of the elliptical electrode element are aligned with the respective vertical and horizontal directions. A potential difference applied between the mesh electrode structure and the elliptical electrode element creates between them an electrostatic field which provides lensing action that is stronger in the horizontal direction than in the vertical direction. The difference between the lensing action in the horizontal and vertical directions is proportional to the relative lengths of the respective minor and major axes of the elliptical electrode element.
REFERENCES:
patent: 2103645 (1937-12-01), Schlesinger
patent: 4507586 (1985-03-01), Correll
patent: 4623819 (1985-11-01), Janko et al.
patent: 4752714 (1988-06-01), Sonneborn et al.
Maxson Scott A.
Sonneborn John H.
Angello Paul S.
Meininger Mark M.
Moore David K.
Tektronix Inc.
Wieder K.
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