US3587019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning coils
Assignee: EMI Ltd
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Filing: 1968-08-22
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Granted: 1971-06-22
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Expires: 1988-08-22
Abstract
Abstract A circuit element, which is intended to be rolled into a cylindrical or like form to constitute a scanning coil assembly for a cathode-ray tube, is formed of a tapelike, flexible substrate with conductive patterns on either side thereof. Each pattern comprises a plurality of side by side conductors conforming to a longitudinally extending, substantially rectangular waveform, formed of alternate longitudinal and transverse portions. The longitudinal portions of the two waveforms are staggered with respect to each other, and respective conductors in the transverse portions are offset with respect to one another in the longitudinal direction so as to tend to reduce the self-capacitance of the element when wound to form a scanning coil assembly.
Inventors
- 👤 Eric William Bull
- 👤 Alfred Marcos Sampeys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/768
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A printed circuit scanning coil arrangement comprising a flexible base which supports two overlapping and mutually insulated electrically conductive patterns, interconnected to form a series circuit, each pattern comprising a plurality of side-by-side conductors conforming to a repetitive, longitudinally extending rectangular waveform consisting of alternate longitudinal and transverse parts at right angles to one another, one pattern being displaced relative to the other so that the longitudinal parts of the respective waveforms are staggered, the base being rolled in a plurality of turns about an axis parallel to said transverse conductor parts, to form scanning coils in which the transverse parts of the conductors are disposed in two diametrically opposite groups, the improvement lying in that the transverse parts of the conductors of the two patterns are relatively displaced in the longitudinal direction to offset the respective parts of the conductors in adjacent turns, thereby to reduce the capacitance of the coils.
Claim 2
Dependent Claim
152 words
A printed circuit scanning coil arrangement comprising a flexible base which supports two overlapping and mutually insulated electrically conductive patterns, interconnected to form a series circuit, each pattern comprising a plurality of side-by-side conductors conforming to a repetitive, longitudinally extending rectangular waveform consisting of alternate longitudinal and transverse parts at right angles to one another, one pattern being displaced relative to the other so that the longitudinal parts of the respective waveforms are staggered, the base being rolled in a plurality of turns about an axis parallel to said transverse conductor parts, to form scanning coils in which the transverse parts of the conductors are disposed in two diametrically opposite groups, the improvement lying in that the transverse parts of the conductors of the two patterns are relatively displaced in the longitudinal direction to offset the respective parts of the conductors in adjacent turns, thereby to reduce the capacitance of the coils.
Claim 3
Dependent Claim
50 words
A printed circuit scanning coil arrangement according to claim 1 in which said relative displacement of the transverse parts of the conductors is such that the transverse conductor parts in one turn of the coils are superimposed on the spaces between the conductors on the next turn of the coils.
Claim 4
Dependent Claim
38 words
A printed circuit scanning coil arrangement according to claim 1 in which the width of the transverse parts of said conductors is substantially the same as the width of the spaces between the transverse parts of said conductors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |