Patent US4246560A successfully refreshed from Google Patents.
US4246560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-converging deflection yoke
Assignee: Hitachi Ltd
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Filing: 1978-09-18
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Granted: 1981-01-20
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Expires: 1998-09-18
Abstract
Abstract A deflection yoke for use with a picture tube of a television receiver. A vertical deflection coil of the deflection coil has a larger winding angle on an electron gun side thereof than on a screen side thereof. A magnetic material piece is disposed inside the vertical deflection coil so that a vertical deflection magnetic field is formed into a strong barrel magnetic field on the electron gun side. As a result, a raster scanned on a faceplate of the picture tube is free from misconvergence and pincushion distortion. A core of the deflection yoke has sawtooth-shaped end surfaces, or auxiliary rings having sawtooth-shaped end surfaces are disposed on the end surfaces of the core. As a result, a wire of the vertical deflection coil is prevented from slipping on the end surfaces of the core although the wire of the vertical deflection coil is wound at a large winding angle on the electron gun side.
Inventors
- 👤 Toshiharu Shimizu
- 👤 Takesuke Maruyama
- 👤 Shuzo Matsumoto
- 👤 Kei Yamashita
- 👤 Atushi Takeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:16
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/701; H01J29/702; H01J29/703
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A deflection yoke for a television receiver comprising: a horn-shaped core having a larger opening and a smaller opening; a horizontal deflection coil disposed inside said core; a vertical deflection coil wound on said core so as to produce a pincushion shape magnetic field at said larger opening and a barrel shape magnetic field at said smaller opening with a winding angle of said vertical deflection coil at said smaller opening of said core being larger than a winding angle at said larger opening; and a magnetic material piece disposed inside said vertical deflection coil at a position, on said vertical deflection coil, close to said smaller opening.
Claim 2
Dependent Claim
108 words
A deflection yoke for a television receiver comprising: a horn-shaped core having a larger opening and a smaller opening; a horizontal deflection coil disposed inside said core; a vertical deflection coil wound on said core so as to produce a pincushion shape magnetic field at said larger opening and a barrel shape magnetic field at said smaller opening with a winding angle of said vertical deflection coil at said smaller opening of said core being larger than a winding angle at said larger opening; and a magnetic material piece disposed inside said vertical deflection coil at a position, on said vertical deflection coil, close to said smaller opening.
Claim 3
Dependent Claim
19 words
A deflection yoke according to claim 1, wherein said magnetic material piece is bonded to said vertical deflection coil.
Claim 4
Dependent Claim
17 words
A deflection yoke according to claim 1, wherein said magnetic material piece is attached to a separator.
Claim 5
Dependent Claim
16 words
A deflection yoke according to claim 1, wherein said magnetic material piece is an iron plate.
Claim 6
Dependent Claim
41 words
A deflection yoke according to one of claims 1, 2, 3 or 4 wherein said magnetic material piece is disposed at a position separated from said larger opening by 1/2-3/4 of a distance between said larger opening and said smaller opening.
Claim 7
Dependent Claim
70 words
A deflection yoke according to one of claims 1, 2, 3 or 4, wherein the width of said magnetic material piece is equal to 1/5-1/2 of the distance from said larger opening to said smaller opening of said core and the length of said magnetic material piece is chosen such that an angle looking into said magnetic material piece from the center of said deflection yoke is equal to 30°-70°.
Claim 8
Dependent Claim
57 words
A deflection yoke according to claim 1, wherein auxiliary rings, each having end surfaces formed into sawtooth shape, are attached to end surfaces of said core at said larger opening and said smaller opening to prevent a wire of said coil from slipping, said vertical deflection coil being wound on the sawtooth portions of said auxiliary rings.
Claim 9
Dependent Claim
49 words
A deflection yoke according to claim 1, wherein end surfaces of said larger opening and said smaller opening of said core are notched in sawtooth shape to prevent a wire of said coil from slipping, said vertical deflection coil being wound on the sawtooth portions of said end surfaces.
Claim 10
Dependent Claim
17 words
A deflection yoke according to claims 2 or 3, wherein said magnetic material piece is rectangularly shaped.
Claim 11
Dependent Claim
63 words
A deflection yoke according to claims 7 or 8, wherein said sawtooth shape includes small areas about which said wire of said coil is wound, each of said small areas defining a plane which is normal to said wire of said coil, whereby the tensile force acting on said wire is normal to said plane so as to prevent slipping of said wire.
References Cited (Backward Citations)
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US3711802A
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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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |