Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1986-06-10
1987-12-01
Boudreau, Leo H.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, H01J 2951, H01J 2976
Patent
active
047106719
ABSTRACT:
A color television display tube including an electron gun system (5) in an evacuated envelope for generating three electron beams whose axes are co-planar. The beams converge on a display screen (10) provided on a wall of the envelope and are deflected in the operative display tube across the display screen into two orthogonal directions. The electron gun system (5) has correction elements for causing the rasters scanned on the display screen by the electron beams to coincide as much as possible. The correction elements include annular elements (34) of a material having a high magnetic permeability which are positioned around the two outer beams. In addition a further correction element (38, 38", 38"') of a material having a high magnetic permeability is provided around the central beam in a position located further from the screen in order to correct field coma errors at the ends of the vertical axis and in the corners to an equal extent. The further element is preferably positioned in, or on the screen side of, the area of the focusing gap of the electron gun.
REFERENCES:
patent: 4196370 (1980-04-01), Hughes
patent: 4396862 (1983-08-01), Hughes
Boudreau Leo H.
Kraus Robert J.
U.S. Philips Corporation
Wieder K.
LandOfFree
Color television display tube with coma correction does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Color television display tube with coma correction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color television display tube with coma correction will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1933169