US4331907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection circuit linearity coil
Assignee: RCA Licensing Corp
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Filing: 1980-04-04
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Granted: 1982-05-25
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Expires: 2000-04-04
Abstract
Abstract To provide linearity correction to horizontal scanning current, a linearity coil is coupled to the horizontal deflection winding of a horizontal deflection circuit. The magnetic structure of the linearity coil includes a magnetizable material with generally rectangularly cross-sectioned center and end sections. The faces of the end sections are oriented generally perpendicular to an axis of the center section thereby forming an H-bar core. The H-bar core is located inside a plastic coilform cup, with the sides of the cup generally conforming to the shape of the core. Permanent magnets for biasing the H-bar core are located at opposite ends of the coilform cup adjacent the end sections of the core. The linearity coil conductor turns are wound around the coilform cup over the center section of the H-bar core.
Inventors
- 👤 David E. Laux
- 👤 Kenneth E. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:10
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/42; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/90
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
127 words
A structure for providing linearity correction to scanning current in a deflection winding during a scanning interval, comprising: a core of magnetizable material, including rectangular center and end sections, each of generally rectangular cross-section, with the faces of said end sections oriented generally perpendicular to an axis of said center section to form an H-bar core; a coilform cup with sides generally conforming to the shape of said H-bar core and receiving said H-bar core through an opening in said coilform cup; a first permanent magnet magnetically biasing said H-bar core and located in said coilform cup adjacent one of said end sections of said H-bar core; and a linearity coil with conductor turns wound around said coilform cup over said center section of said H-bar core.
Claim 2
Dependent Claim
127 words
A structure for providing linearity correction to scanning current in a deflection winding during a scanning interval, comprising: a core of magnetizable material, including rectangular center and end sections, each of generally rectangular cross-section, with the faces of said end sections oriented generally perpendicular to an axis of said center section to form an H-bar core; a coilform cup with sides generally conforming to the shape of said H-bar core and receiving said H-bar core through an opening in said coilform cup; a first permanent magnet magnetically biasing said H-bar core and located in said coilform cup adjacent one of said end sections of said H-bar core; and a linearity coil with conductor turns wound around said coilform cup over said center section of said H-bar core.
Claim 3
Dependent Claim
106 words
The structure of claim 1 in combination with a deflection circuit including a deflection generator coupled to said deflection winding for generating said scanning current in said deflection winding, wherein said linearity coil is coupled to said deflection winding such that the bias magnetic flux developed by said first permanent magnet flows in the center section of said H-bar core in a direction that opposes the magnetic flux produced in said center section by current in said linearity coil during a first portion of the scanning interval and aids the magnetic flux produced by current in said coil during a second portion of the scanning interval.
Claim 4
Dependent Claim
31 words
A structure according to claim 1 including a second permanent magnet magnetically biasing said H-bar core and located in said coilform cup adjacent the other end section of said H-bar core.
Claim 5
Dependent Claim
28 words
A structure according to claim 3 wherein the height of said center section of said H-bar core is less than that of either one of said end sections.
Claim 6
Dependent Claim
34 words
A structure according to claim 4 wherein the height of said center section of said H-bar core is less than the height of an adjacent side of the center section of said coilform cup.
Claim 7
Dependent Claim
37 words
A structure according to claim 5 wherein said coilform cup includes an outwardly projecting member at each end of said coilform cup, with each end of said linearity coil being wrapped around a respective outwardly projecting member.
Claim 8
Dependent Claim
48 words
A structure according to claims 3, 4 or 5 wherein each of said first and second permanent magnets is of slab shape, with a slab face contacting the adjacent face of the associated end section of said H-bar core, each permanent magnet being magnetized across the slab thickness.
Claim 9
Dependent Claim
45 words
A structure according to claim 7 wherein opposite walls of each end section of said coilform cup are formed with inwardly protruding bosses, each of said two permanent magnets having an indentation at an intermediate location in opposite slab sides capable of receiving a boss.
Claim 10
Dependent Claim
37 words
A structure according to claim 1 including means for securing said first permanent magnet at different levels above the bottom of said coilform cup to adjust the amount of bias magnetic flux flowing in said H-bar core.
Claim 11
Dependent Claim
42 words
A structure according to claim 9 wherein said first permanent magnet is of slab shape, with a slab face contacting the adjacent face of the associated end section of said H-bar core, said first permanent magnet being magnetized across the slab thickness.
Claim 12
Dependent Claim
49 words
A structure according to claim 10 wherein said securing means comprises inwardly protruding bosses formed in opposing walls of the end section of said coilform cup associated with said first permanent magnet and complementary indentations formed at intermediate locations in opposite sides of said slab shaped first permanent magnet.
Claim 13
Dependent Claim
31 words
A structure according to claim 11 including a second permanent magnet magnetically biasing said H-bar core and located in said coilform cup adjacent the other end section of said H-bar core.
Claim 14
Dependent Claim
154 words
In a horizontal deflection circuit with a horizontal deflection generator generating horizontal scanning current in a horizontal deflection winding during a horizontal scanning interval; a linearity reactor with a reactor winding coupled to said horizontal deflection winding, the inductance of which reactor varies during the horizontal scanning interval in a manner that provides linearity correction to said horizontal scanning current, said reactor comprising: a core of magnetizable material having a generally rectangularly shaped center section widening to form a generally rectangularly shaped end flange at each end thereof, a housing with walls generally conforming to the shape of said core, open at one side to receive said core, a permanent magnet of slab shape magnetically biasing said core and located in said housing, a face of said magnet substantially contacting an end flange of said core, said reactor winding having conductor turns wound around said core housing over said center section of said core.
Claim 15
Dependent Claim
154 words
In a horizontal deflection circuit with a horizontal deflection generator generating horizontal scanning current in a horizontal deflection winding during a horizontal scanning interval; a linearity reactor with a reactor winding coupled to said horizontal deflection winding, the inductance of which reactor varies during the horizontal scanning interval in a manner that provides linearity correction to said horizontal scanning current, said reactor comprising: a core of magnetizable material having a generally rectangularly shaped center section widening to form a generally rectangularly shaped end flange at each end thereof, a housing with walls generally conforming to the shape of said core, open at one side to receive said core, a permanent magnet of slab shape magnetically biasing said core and located in said housing, a face of said magnet substantially contacting an end flange of said core, said reactor winding having conductor turns wound around said core housing over said center section of said core.
Claim 16
Dependent Claim
38 words
A linearity reactor according to claim 13 including another permanent magnet of slab shape magnetically biasing said core and located in said housing, a face of said other magnet substantially contacting the other end flange of said core.
Claim 17
Dependent Claim
45 words
A linearity reactor according to claim 14 wherein each of said permanent magnets is magnetized across opposite slab faces, the bias flux generated in the center section of said core by one of said permanent magnets aiding the bias flux generated by the other magnet.
Claim 18
Dependent Claim
46 words
A linearity reactor according to claim 15 wherein opposite walls at each end of said housing include inwardly directed bosses forming a spring detent, each of said two permanent magnets having an indentation at an intermediate location in opposite slab sides capable of receiving a boss.
Claim 19
Dependent Claim
20 words
A linearity reactor according to claim 16 wherein each of said two permanent magnets is formed of a rubber-like material.
Claim 20
Dependent Claim
19 words
A linearity reactor according to claim 17 wherein said rubber-like material comprises barium ferrite mixed in a plastic binder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |