Patent US4212005A successfully refreshed from Google Patents.
US3743984A
Expired / Lapsed
US
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Magnetic convergence device for use in an in-line type color cathode ray tube
Assignee: Toshiba Corp
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Filing: 1972-03-24
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Granted: 1973-07-03
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Expires: 1992-03-24
Abstract
Abstract A pair of E-shaped cores are mounted radially in opposite directions on the outer surface of a neck portion of an inline type color cathode ray tube. Each of the E-shaped cores has a center leg and two side legs about which dynamic convergence coils are wound in radial arrangement relative to the neck portion so as to converge electron beams from the cathode ray tubes along the longitudinal direction of the center legs of the respective cores. First and second disc-shaped permanent magnets are rotatably mounted on a cross-piece connecting the one side ends of the respective legs, and provide adjustable static fluxes cooperating with the dynamic convergence flux by travelling through the center and side legs and across the open ends thereof.
Inventors
- 👤 K Itaka
- 👤 S Takenaka
- 👤 S Goshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:51
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J2229/00; H01J2229/56; H01J2229/568; H01J2229/5681; H01J2229/5682
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
A magnetic convergence device for use in an in-line type color cathode ray tube comprising: a pair of E-shpaed cores, each having a center leg, two side legs and a cross-piece connecting the ends of said center and side legs; a non-magnetic frame having a tubular member so as to mount said cores radially in facing relationship on the outer surface of the neck portion of said cathode ray tube; dynamic convergence coils wound about said legs so as to generate a dynamic convergence flux therethrough; at least two disc-shaped permanent magnets for creating an adjustable static flux cooperating with said dynamic convergence flux by traveling through said legs and across the open ends thereof; and means for rotatably mounting two of said permanent magnets on the cross-piece of at least one of said E-shaped cores such that said permanent magnets are both rotatable relative to said at least one core.
Claim 2
Dependent Claim
151 words
A magnetic convergence device for use in an in-line type color cathode ray tube comprising: a pair of E-shpaed cores, each having a center leg, two side legs and a cross-piece connecting the ends of said center and side legs; a non-magnetic frame having a tubular member so as to mount said cores radially in facing relationship on the outer surface of the neck portion of said cathode ray tube; dynamic convergence coils wound about said legs so as to generate a dynamic convergence flux therethrough; at least two disc-shaped permanent magnets for creating an adjustable static flux cooperating with said dynamic convergence flux by traveling through said legs and across the open ends thereof; and means for rotatably mounting two of said permanent magnets on the cross-piece of at least one of said E-shaped cores such that said permanent magnets are both rotatable relative to said at least one core.
Claim 3
Dependent Claim
60 words
A magnetic convergence device as claimed in claim 1 wherein each of said E-shaped cores has a cross-piece separated into first, second and third divisions respectively connected to said center and side legs with first and second magnetic gaps provided between the adjacent ones of said divisions; and said permanent magnets are so positioned as to bridge the magnetic gaps.
Claim 4
Dependent Claim
69 words
A magnetic convergence device as claimed in claim 1 wherein said means for rotatably supporting the permanent magnets has two supporting members, each of which is pivotally mounted on said frame and has an adjusting wheel, a rod member with a rectangular head, each of said magnets having a rectangular bore for slidably receiving said rectangular head, and a spring member for resiliently pressing said magnet against said cross-piece.
Claim 5
Dependent Claim
34 words
A magnetic convergence device as claimed in claim 3 wherein the first and second adjusting wheels included in said two supporting members are positioned at different distances from the end wall of the frame.
Claim 6
Dependent Claim
33 words
A magnetic converence device as claimed in claim 4 wherein the peripheral portions of the first and second adjusting wheels overlap each other as viewed in the lengthwise direction of the convergence device.
Claim 7
Dependent Claim
39 words
A magnetic convergence device as claimed in claim 4 wherein said first and second adjusting wheels are so disposed as to prevent their peripheral portions from overlapping each other as viewed in the lengthwise direction of the convergence device.
Claim 8
Dependent Claim
50 words
A magnetic convergence device as claimed in claim 1 wherein said means for rotatably supporting the permanent magnets include supporting rods sEcured to said frame, said magnets having bores for rotatably receiving the free end of said supporting rods and spring members for resiliently pressing said magnets against said cross-piece.
Claim 9
Dependent Claim
36 words
A magnetic convergence device as claimed in claim 1 wherein said means for rotatably supporting the permanent magnets include spring members stretched between said frame and permanent magnets for resiliently pressing said magnets against said cross-piece.
Claim 10
Dependent Claim
18 words
A magnetic convergence device as claimed in claim 8 wherein said spring member is a compression coil spring.
Claim 11
Dependent Claim
37 words
A magnetic convergence device as claimed in claim 8 wherein said spring member is a hook-shaped leaf spring, the curved portion thereof engaging the surface of said magnets and the straight portion being secured to said frame.
Claim 12
Dependent Claim
42 words
A magnetic convergence device as claimed in claim 1 comprising four disc-shaped permanent magnets, and wherein said means for rotatably mounting said magnets includes means for rotatably mounting two of said permanent magnets on respective cross-pieces of each of said E-shaped cores.
References Cited (Backward Citations)
US3305807A
Cited
US3496501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |