Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1994-11-23
1996-05-21
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313431, 313440, 313442, 335213, H01J 2970
Patent
active
055192815
ABSTRACT:
Display tube comprising a deflection unit provided with a (twist) correction device which includes an annular (twist) correction coil surrounding the tube neck, which coil, when energized by a circuit providing a (twist) correction current, generates a magnetic correction field in the axial direction of the display tube. According to the invention, the device also provides a 4-pole y field for correcting (twist) errors in the center of the display screen. This 4-pole y field can be generated by causing the turns of the annular coil to follow a path having four predetermined corrugations alternately facing the display screen and the electron gun.
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Kraus Robert J.
O'Shea Sandra L.
Patel Ashok
U.S. Philips Corporation
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