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US 5,408,159 AGranted
Deflection yoke with a forked shunt
AssigneeThomson Tubes & Displays, S.A.
InventorsAndre Maillot, David Perron
Life of this patent
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Abstract
A pair of E-shaped shunts are disposed near the top and bottom, respectively, of a deflection yoke for reducing inner and outer horizontal trap errors. A central portion of the E-shaped shunt reduces a ratio between magnitudes of inner and outer E-W pincushion raster distortions.
Claims13
A deflection apparatus, comprising:
- a cathode ray tube of an in-line system including an evacuated glass envelope, a display screen disposed at one end of said envelope, an electron gun assembly disposed at a second end of said envelope, said electron gun assembly producing a plurality of electron beams that form corresponding rasters on said screen upon deflection;
- a deflection yoke mounted around said envelope, including:
- a vertical deflection coil and a horizontal deflection coil for producing a deflection field in said cathode ray tube;
- a core made of magnetically permeable material magnetically coupled to said vertical and horizontal deflection coils;
- and
- a pair of field formers disposed adjacent to at least one of said deflection coils between a beam entrance end and a beam exit end thereof at the top end and a bottom end, respectively, of a Y-axis and symmetrically with respect to an X-axis of said yoke, each of said field formers including a center leg and two outer legs spaced apart in a transverse direction and a member connecting together the plurality of legs.
3 more elements
A deflection apparatus, comprising:
- a cathode ray tube of an in-line system including an evacuated glass envelope, a display screen disposed at one end of said envelope, an electron gun assembly disposed at a second end of said envelope, said electron gun assembly producing a plurality of electron beams that form corresponding rasters on said screen upon deflection;
- a deflection yoke mounted around said envelope, including:
- a vertical deflection coil and a horizontal deflection coil for producing a deflection field in said cathode ray tube;
- a core made of magnetically permeable material magnetically coupled to said vertical and horizontal deflection coils;
- and
- a first field former disposed adjacent to one of said deflection coils and between a beam entrance end and a beam exit end thereof for modifying said deflection field, including a center leg and two outer legs spaced apart in a transverse direction and a member connecting together the plurality of legs.
3 more elements
Dependencies are inferred from the claim text.