US4451807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television raster pincushion distortion correction device
Assignee: RCA Licensing Corp
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Filing: 1983-07-27
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Granted: 1984-05-29
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Expires: 2003-07-27
Abstract
Abstract A television receiver deflection yoke mounted on a kinescope incorporates toroidally wound vertical deflection coils which generate stray fields that undesirably interact with components of adjacent receivers or video monitors. The deflection yoke incorporates magnetically permeable field forming members which utilize the stray field flux to form an electromagnetic field at the front of the yoke to aid in side pincushion distortion correction. The field forming members comprise a flux gathering portion which is located within the region of the stray field and follows the contour of the yoke core. The flux gathering portions extend along substantially the entire length of the vertical coils and are curved to encompass a significant portion of the external surface of the core in order to reduce the undesirable effects of the stray field and to form a strong pincushion distortion correcting field.
Inventors
- 👤 Kenneth W. McGlashan
- 👤 John R. Archer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:15
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/766
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A deflection yoke comprising: a magnetically permeable core; a pair of deflection coils toroidally wound on said core and adapted for coupling to a source of deflection signals for producing a deflection field encircled by said core and producing a stray field external to said core; and field shaping apparatus comprising: magnetically permeable flux directing means disposed at the front of said yoke for forming an electromagnetic field at the front of said yoke for influencing the movement of an electron beam; magnetically permeable flux gathering means located within said stray field and coupled to said flux directing means, said flux gathering means extending along substantially the entire length of said deflection coils and encircling a significant portion of said coils.
Claim 2
Dependent Claim
121 words
A deflection yoke comprising: a magnetically permeable core; a pair of deflection coils toroidally wound on said core and adapted for coupling to a source of deflection signals for producing a deflection field encircled by said core and producing a stray field external to said core; and field shaping apparatus comprising: magnetically permeable flux directing means disposed at the front of said yoke for forming an electromagnetic field at the front of said yoke for influencing the movement of an electron beam; magnetically permeable flux gathering means located within said stray field and coupled to said flux directing means, said flux gathering means extending along substantially the entire length of said deflection coils and encircling a significant portion of said coils.
Claim 3
Dependent Claim
17 words
The arrangement defined in claim 1, wherein said deflection coils provide vertical deflection of said electron beam.
Claim 4
Dependent Claim
13 words
The arrangement defined in claim 2, wherein said electromagnetic field is pincushion shaped.
Claim 5
Dependent Claim
22 words
The arrangement defined in claim 3, wherein said electromagnetic field corrects side pincushion distortion of a raster scanned by said electron beam.
Claim 6
Dependent Claim
41 words
The arrangement defined in claim 1, wherein said flux directing means comprises individual flux directing members on opposite sides of said yoke, said electromagnetic field being formed between respective ones of said flux directing members on opposite sides of said yoke.
Claim 7
Dependent Claim
19 words
The arrangement defined in claim 1, wherein said flux gathering means is located in close proximity to said core.
Claim 8
Dependent Claim
28 words
The arrangement defined in claim 6, wherein said magnetically permeable core has generally a bell-shaped contour and said flux gathering means follows said bell-shaped contour of said core.
Claim 9
Dependent Claim
22 words
The arrangement defined in claim 7, wherein said flux gathering means shunts a significant portion of the flux of said stray field.
Claim 10
Dependent Claim
114 words
A deflection yoke comprising: a magnetically permeable core; a pair of deflection coils toroidally wound on said core and adapted for coupling to a source of deflection signals for producing a deflection field encircled by said core and producing a stray field external to said core; and field shaping apparatus comprising: magnetically permeable flux directing means disposed at the front of said yoke for forming an electromagnetic field at the front of said yoke for influencing the movement of an electron beam; magnetically permeable flux gathering means located within said stray field and coupled to said flux directing means, said flux gathering means encompassing more than half of the external surface of said core.
Claim 11
Dependent Claim
114 words
A deflection yoke comprising: a magnetically permeable core; a pair of deflection coils toroidally wound on said core and adapted for coupling to a source of deflection signals for producing a deflection field encircled by said core and producing a stray field external to said core; and field shaping apparatus comprising: magnetically permeable flux directing means disposed at the front of said yoke for forming an electromagnetic field at the front of said yoke for influencing the movement of an electron beam; magnetically permeable flux gathering means located within said stray field and coupled to said flux directing means, said flux gathering means encompassing more than half of the external surface of said core.
Claim 12
Dependent Claim
126 words
A television display system comprising: a pair of deflection coils toroidally wound on said core and adapted for coupling to a source of deflection signals for producing a deflection field encircled by said core for deflecting said electron beam, said deflection coils also producing a stray field external to said core; and field shaping apparatus comprising: magnetically permeable flux directing means disposed at the front of said yoke for forming an electromagnetic field at the front of said yoke for influencing the movement of said electron beam; magnetically permeable flux gathering means located within said stray field and coupled to said flux directing means, said flux gathering means extending along substantially the entire length of said deflection coils and encircling a significant portion of said coils.
Claim 13
Dependent Claim
126 words
A television display system comprising: a pair of deflection coils toroidally wound on said core and adapted for coupling to a source of deflection signals for producing a deflection field encircled by said core for deflecting said electron beam, said deflection coils also producing a stray field external to said core; and field shaping apparatus comprising: magnetically permeable flux directing means disposed at the front of said yoke for forming an electromagnetic field at the front of said yoke for influencing the movement of said electron beam; magnetically permeable flux gathering means located within said stray field and coupled to said flux directing means, said flux gathering means extending along substantially the entire length of said deflection coils and encircling a significant portion of said coils.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |