Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1988-10-27
1989-10-31
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural concentrating, accelerating, and/or de-accelerating...
313414, 313449, H01J 2946, H01J 2956
Patent
active
048779989
ABSTRACT:
An improved color display system includes a cathode-ray tube and a magnetic deflection yoke positioned on the tube. The tube includes an envelope having an inline electron gun for generating and directing three inline beams along initially coplanar paths toward a screen on an interior surface portion of the envelope. The gun includes a plurality of spaced electrodes which comprise three lenses. The first lens includes a beam-forming region for providing substantially symmetrical beams to a second lens. The second lens includes a first modulation electrode for providing asymmetrically-shaped beams to a third, or main, lens. At least one and preferably two dynamic voltage signals are applied to the modulation electrode of the second lens. Another dynamic voltage signal is applied to a second modulation electrode of the third lens. The voltage signals are related to the deflection of the beams and improve the electron beam spot size at the periphery of the tube screen.
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Quadrupole Lens For Dynamic Focus and Astigmatism Control In An Elliptical Aperture Lens Gun, S. Shirai et al. SID Digest, 162 (1987).
Dynamic Astigmatism Control Quadra Potential Focus Gun for 21-in. Flat Square Color Display Tube, by T. Katsuma et al., SID Digest, 136 (1988).
Lundvall II Carl L.
Maninger Loren L.
New David A.
Blum Theodore M.
Coughlin Jr. Vincent J.
Irlbeck Dennis H.
RCA Licensing Corp.
Tripoli Joseph S.
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