Patent US3743985A successfully refreshed from Google Patents.
US3743985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convergence system
Assignee: Panasonic Holdings Corp
•
Filing: 1972-06-09
•
Granted: 1973-07-03
•
Expires: 1992-06-09
Abstract
Abstract In the static convergence for making a blue electron beam pass a point at which a red electron beam intersects with a green electron beam, a convergence system in which the static convergence operation is facilitate by preventing the magnetic force of the blue lateral magnet from adversely affecting the red and green electron beams at the time of operating the same magnet for driving the blue electron beam.
Inventors
- 👤 K Hiya
- 👤 M Nishimura
- 👤 K Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:02
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J29/703
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A convergence system comprising a mount portion fixed on the neck portion of a color picture tube having three electron guns arranged symmetrically with respect to a point, a plurality of dynamic convergence units and static convergence units arranged on the periphery of said mount portion, a blue lateral magnet mounted on a portion of said mount portion fOr driving a blue electron beam in a lateral direction, and an operating disc with a plurality of spiral grooves cut thereon, said blue lateral magnet being rotatable by means of said spiral grooves on said operating disc without any linear movement thereby to control the magnetic power applied to the blue electron beam, said magnetic power of said blue lateral magnet producing final static convergence of the red, green and blue beams.
Claim 2
Dependent Claim
131 words
A convergence system comprising a mount portion fixed on the neck portion of a color picture tube having three electron guns arranged symmetrically with respect to a point, a plurality of dynamic convergence units and static convergence units arranged on the periphery of said mount portion, a blue lateral magnet mounted on a portion of said mount portion fOr driving a blue electron beam in a lateral direction, and an operating disc with a plurality of spiral grooves cut thereon, said blue lateral magnet being rotatable by means of said spiral grooves on said operating disc without any linear movement thereby to control the magnetic power applied to the blue electron beam, said magnetic power of said blue lateral magnet producing final static convergence of the red, green and blue beams.
Claim 3
Dependent Claim
62 words
A convergence system according to claim 1, in which said blue lateral magnet is rotatable around a central rotational axis thereof, said blue lateral magnet having on the periphery thereof a plurality of protrusions for engagement with one of said spiral grooves of said operating disc, said blue lateral magnet being fixed on part of said mount portion of the picture tube.
Claim 4
Dependent Claim
107 words
A convergence system according to claim 1, in which said blue lateral magnet is rotatable around a central rotational axis thereof and has on the periphery thereof a plurality of protrusions for engagement with one of said spiral grooves of said operating disc, said blue lateral magnet being fixed on part of said mount portion of the picture tube, said convergence system further comprising a rotatable correcting magnet of the same structure as said blue lateral magnet, said correcting magnet being disposed opposedly to said blue lateral magnet, said correcting magnet counteracting the magnetic power of said blue lateral magnet applied to the red and green beams.
Claim 5
Dependent Claim
112 words
A convergence system according to claim 1, comprising a pair of blue lateral magnets adapted to rotate on axes intermediate between blue and red beams and between blue and green beams respectively by means of an operating disc, said blue, red and green electron beams passing through said neck portion of the picture tube, a pair of substantially L-shaped magnetic pole plates extending from said blue lateral magnets to the central axis along which the blue beam passes, said pair of blue lateral magnets being used to drive the blue beam, the red and green beams being deflected toward the blue beam in response to the lateral adjustment of the blue beam.
Claim 6
Dependent Claim
111 words
A convergence system according to claim 1, comprising a blue lateral magnet positioned nearest to the blue beam, an operating disc for rotating said blue lateral magnet, and an L-shaped magnetic pole plate including a semi-circular portion extending over the angle of about 120* and end portions bent inwardly in a radial direction, said semi-circular portion of said channel-shaped magnetic pole plate being positioned on the peripheral portion of said blue lateral magnet, the magnetic power of said blue lateral magnet being used for lateral adjustment of the blue beam, the red and green beams being driven toward the blue beam in response to said lateral adjustment of the blue beam.
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) | 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 |