US3623151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convergence yoke cores for cathode-ray tubes
Assignee: Denki Onkyo Co Ltd
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Filing: 1970-07-13
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Granted: 1971-11-23
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Expires: 1990-07-13
Abstract
Abstract In a convergence yoke core comprising a pair of L-shaped core members disposed in a U-shaped configuration with their inner ends of shorter legs opposed to each other with a gap therebetween and a static magnet disposed above the gap, the gap is bridged by a magnetic member having positive thermal expansion coefficient or negative thermal coefficient of permeability so as to compensate for the variation in the magnetic flux of the static magnet caused by the variation in the ambient temperature.
Inventors
- 👤 Hiroshi Ikeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278; H01F7/0284; H01J; H01J29/00; H01J29/006; H01J29/46; H01J29/70; H01J29/701
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A convergence yoke core for a cathode-ray tube comprising a pair of core members of a predetermined configurati on, corresponding one ends of said core members being spaced apart a predetermined gap and the other corresponding ends of said core members being also spaced apart to supply magnetic flux to said cathode-ray tube, a static magnet positi oned above said gap and a magnetic member disposed to bridge said gap, said static magnet having a tendency to vary its flux according to the v ariation in the ambient temper ature and sai d magnetic member having characteristic to compensate for said variation of the flux of said static magnet whereby to maintain the flux across said other ends of said core mem bers at a substantially constant value.
Claim 2
Dependent Claim
128 words
A convergence yoke core for a cathode-ray tube comprising a pair of core members of a predetermined configurati on, corresponding one ends of said core members being spaced apart a predetermined gap and the other corresponding ends of said core members being also spaced apart to supply magnetic flux to said cathode-ray tube, a static magnet positi oned above said gap and a magnetic member disposed to bridge said gap, said static magnet having a tendency to vary its flux according to the v ariation in the ambient temper ature and sai d magnetic member having characteristic to compensate for said variation of the flux of said static magnet whereby to maintain the flux across said other ends of said core mem bers at a substantially constant value.
Claim 3
Dependent Claim
17 words
The convergence yoke core according to claim 1 wherein said magnetic member has positive thermal expansion coefficient.
Claim 4
Dependent Claim
26 words
The convergence yoke core according to claim 2 wherein said magnetic member is interposed between and bonded to said corresponding one ends of said core members.
Claim 5
Dependent Claim
27 words
The convergence yoke core according to claim 2 wherein said magnetic member is bonded to at least one side of said core members to bridge said gap.
Claim 6
Dependent Claim
18 words
The convergence yoke core according to claim 1 wherein said magnetic member has negative thermal coefficient of permeability.
Claim 7
Dependent Claim
27 words
The convergence yoke core according to claim 5 wherein said magnetic member is interposed between and bonded to said corresponding one ends of said core memb ers.
Claim 8
Dependent Claim
28 words
The conve rgence yoke core according to claim 5 wherein said magnetic member is bonded to at least one side of said core members to bridge said gap.
Claim 9
Dependent Claim
22 words
The convergence yoke core according to claim 1 wherein said core members have generally L-shaped configuration and are disposed in U-shaped configuration.
References Cited (Backward Citations)
CA716216A
Cited
US3325757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |