Patent US3863184A successfully refreshed from Google Patents.
US3863184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television scanning linearity device
Assignee: RCA Licensing Corp
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Filing: 1974-05-16
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Granted: 1975-01-28
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Expires: 1994-05-16
Abstract
Abstract A television scanning linearity device comprises a coil wound around a coil form which has an internal recess along the length of the coil at right angles to the conductor turns. A ferrite core is disposed in the recess and a surface-magnetized permanent magnet is placed adjacent to the core within the recess, the magnetized surface being adjacent to the core for magnetically biasing the core such that scanning current of one polarity passed through the coil saturates the core whereas scanning current of the opposite polarity does not, the coil thereby presenting a nonlinear inductance for linearizing the television scanning.
Inventors
- 👤 Leslie Neil Thibodeau
- 👤 Lawrence Edward Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:23
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/14; H01F29/146; H01F17/00; H01F17/04; H01F17/045; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/237
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
An electromagnetic coil assembly for providing different inductances to current of different polarity passing through said coil, comprising: a coil form member of nonmagnetic material comprising a shell, the outer surface of which is adapted to have a coil wound thereon and the inner surface of which forms a recess; a coil wound about said outer surface of said shell; a generally rectangular magnetically saturable ferrite core member disposed within said recess; and a generally rectangular ferrite permanent magnet mounted adjacent to said core member within said recess, said magnet being magnetized only on its surface disposed adjacent to said core with a single different pole at each end of the length of said magnet for magnetically biasing said core such that the flux generated in said core by said magnet opposes the flux generated in said core by current of a first polarity passing through said coil and said flux generated by said magnet aids the flux generated in said core by current of a second polarity passing through said coil for saturating said core, thereby providing different inductances in said coil for the same amount of current of said first and second polarities.
Claim 2
Dependent Claim
195 words
An electromagnetic coil assembly for providing different inductances to current of different polarity passing through said coil, comprising: a coil form member of nonmagnetic material comprising a shell, the outer surface of which is adapted to have a coil wound thereon and the inner surface of which forms a recess; a coil wound about said outer surface of said shell; a generally rectangular magnetically saturable ferrite core member disposed within said recess; and a generally rectangular ferrite permanent magnet mounted adjacent to said core member within said recess, said magnet being magnetized only on its surface disposed adjacent to said core with a single different pole at each end of the length of said magnet for magnetically biasing said core such that the flux generated in said core by said magnet opposes the flux generated in said core by current of a first polarity passing through said coil and said flux generated by said magnet aids the flux generated in said core by current of a second polarity passing through said coil for saturating said core, thereby providing different inductances in said coil for the same amount of current of said first and second polarities.
Claim 3
Dependent Claim
25 words
An electromagnetic coil assembly according to claim 1 wherein said core and said magnet extend within said recess substantially the full length of said coil.
Claim 4
Dependent Claim
29 words
An electromagnetic coil assembly according to claim 1 wherein said core and said magnet extend within said recess for a length less than the full length of said coil.
Claim 5
Dependent Claim
16 words
An electromagnetic coil assembly according to claim 2 wherein said magnet is made of barium ferrite.
Claim 6
Dependent Claim
30 words
An electromagnetic coil assembly according to claim 3 wherein said core and said magnet are slideably adjustable within said recess of said shell for adjusting the inductance of said coil.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |