Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1986-02-12
1989-12-12
Safourek, Benedict V.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315382, 313414, G09G 104
Patent
active
048870099
ABSTRACT:
A color display system includes a cathode-ray tube and yoke. The yoke is a self-converging type that produces an astigmatic magnetic deflection field within the tube. The cathode-ray tube has an electron gun for generating and directing three electron beams along paths toward a screen of the tube. The electron gun includes electrodes that comprise a beam-forming region and electrodes that form a main focusing lens, and features electrodes for forming a multipole lens between the beam-forming region and the main focusing lens in each of the electron beam paths. Each multipole lens is oriented to provide a correction to an associated electron beam to at least partially compensate for the effect of the astigmatic magnetic field on the associated beam. There are two multipole lens electrodes. A first multipole lens electrode is connected to a main focusing lens electrode, and a second multipole lens electrode is located between the first multipole lens electrode and the beam-forming region and facing the first multipole lens electrode.
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Bloom Stanley
Hockings Eric F.
Irlbeck Dennis H.
RCA Licensing Corporation
Safourek Benedict V.
Salindong T.
Tripoli Joseph S.
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