Patent US3743983A successfully refreshed from Google Patents.
US3743983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focussing and deflecting system comprising a ferromagnetic wire-coil
Assignee: US Philips Corp
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Filing: 1972-02-08
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Granted: 1973-07-03
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Expires: 1992-02-08
Abstract
Abstract The coil former of an electron-optical system comprising a magnetic focussing device, an electromagnetic deflecting device and a coil former of ferromagnetic wire which is coaxially arranged therebetween, is provided with wire turns such that the interference in the picture signal occurring with systems of this kind is suppressed. This is achieved, for example, by imparting an opposed winding sense to the winding wire for the coil former for two axial portions, or by providing a plurality of winding layers having opposed winding senses one over the other.
Inventors
- 👤 B Holman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:28
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/867; H01J29/46; H01J29/58; H01J29/64; H01J29/66
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
A device comprising means for magnetically focusing an electron beam, means for electromagnetically deflecting said beam having a deflecting field having an axial center and means for suppressing magnetic induction interference comprising a ferromagnetic coil disposed between said focusing and deflecting means and having two oppositely wound portions defining a winding sense turning point.
Claim 2
Independent Claim
54 words
A device comprising means for magnetically focusing an electron beam, means for electromagnetically deflecting said beam having a deflecting field having an axial center and means for suppressing magnetic induction interference comprising a ferromagnetic coil disposed between said focusing and deflecting means and having two oppositely wound portions defining a winding sense turning point.
Claim 3
Dependent Claim
23 words
A device as claimed in claim 1 wherein said portions are uniformly wound and said turning point is aligned with said axial center.
Claim 4
Dependent Claim
20 words
A device as claimed in claim 1 wherein portions together comprise a continuous wire folded back at said turning point.
Claim 5
Dependent Claim
28 words
A device as claimed in claim 1 each of said portions comprise an end at said turning point, said ends being diametrically opposed with respect to each other.
Claim 6
Independent Claim
60 words
A device comprising means for magnetically focusing an electron beam; means for electromagnetically deflecting said beam; and means for suppressing magnetic induction inteference comprising a jacket disposed between said focusing and deflecting means, a ferromagnetic first coil wound on said jacket and having a continuous winding sense, and a magnetically neutral electrically conducting second coil toroidally wound about said jacket.
Claim 7
Independent Claim
60 words
A device comprising means for magnetically focusing an electron beam; means for electromagnetically deflecting said beam; and means for suppressing magnetic induction inteference comprising a jacket disposed between said focusing and deflecting means, a ferromagnetic first coil wound on said jacket and having a continuous winding sense, and a magnetically neutral electrically conducting second coil toroidally wound about said jacket.
Claim 8
Dependent Claim
16 words
A device as claimed in claim 5 wherein said second coil comprises supply and output leads.
Claim 9
Dependent Claim
16 words
A device as claimed in claim 5 further comprising means for short circuiting said second coil.
Claim 10
Independent Claim
59 words
A device comprising means for magnetically focusing an electron beam; means for electromagnetically deflecting said beam; and means disposed between said focusing and deflecting means for suppressing magnetic induction interference comprising a plurality ferromagnetic windings disposed one about the other, each of said windings having a winding sense opposite with respect to the widning sense of the adjacent windings.
Claim 11
Independent Claim
59 words
A device comprising means for magnetically focusing an electron beam; means for electromagnetically deflecting said beam; and means disposed between said focusing and deflecting means for suppressing magnetic induction interference comprising a plurality ferromagnetic windings disposed one about the other, each of said windings having a winding sense opposite with respect to the widning sense of the adjacent windings.
Claim 12
Dependent Claim
14 words
A device as claimed in claim 8 wherein said plurality is even in number.
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 |