In-line SB electron gun with large and deep main lens apertures
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United States of America Patent
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Jan 11, 2000
Grant Date -
N/A
app pub date -
Jul 30, 1997
filing date -
Jul 30, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An in-line electron gun includes a main lens having G3 and G4 three aperture electrodes and corresponding chain link (extended aperture) electrodes. The outer apertures in each of the G3 and G4 electrodes are barrel shaped and the middle aperture is elliptical. This construction maximizes the aperture area. The spacings between the G3 and G4 electrodes and their corresponding chain link electrodes are maximized within the existing size constraints of the gun. The combined effect weakens the electric field of the main lens which reduces spherical aberration.
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