US3812439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanner with reed relays
Assignee: Gemalto Terminals Ltd
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Filing: 1972-06-19
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Granted: 1974-05-21
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Expires: 1992-06-19
Abstract
Abstract Electrical switching apparatus such as a scanner comprises a plurality of reed relays, each of which has an operating coil, and at least one reed contact unit which is mounted outside the coil, to reduce thermal E.M.F. generation. The reed contact units are mounted on a first printed circuit board, and control respective analogue signals passing through the printed circuit tracks of this first board, while the coils are mounted on, and respectively energised via the printed circuit tracks of, a second printed circuit board parallel to the first board. In this way, interference between the scanned analogue signals and the relay energising signals is reduced.
Inventors
- 👤 G Parmenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:46
CPC Classifications
H; H01; H01H; H01H47/00; H01H51/00; H01H51/28; H01H51/281; H01H67/00; H01H67/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
A scanner unit for selectively connecting one of a plurality of analog electrical signals to be measured to the input of an electrical measuring instrument, the scanner unit comprising a first printed circuit board having a plurality of first electrical conductive tracks thereon for the passage of the analog electrical signals; a second printed circuit board mounted in substantially parallel relationship to said first board and having a plurality of second electrically conductive tracks thereon for the passage of relay energizing signals; a plurality of reed relays each comprising a coiled conductor connected directly in series with one of said second tracks and responsive to a relay energizing signal thereon to produce magnetic flux, and at least one reed contact unit positioned outside of the coiled conductor and responsive to the magnetic flux produced by said coiled conductor to close normally open contacts therein, each of said reed contact units being mounted directly on said first board, the contacts within each said reed contact unit being connected directly in series with one of said first tracks whereby selective energization of one of said second tracks causes completion of a circuit through at least one of said first tracks to the measuring instrument.
Claim 2
Dependent Claim
202 words
A scanner unit for selectively connecting one of a plurality of analog electrical signals to be measured to the input of an electrical measuring instrument, the scanner unit comprising a first printed circuit board having a plurality of first electrical conductive tracks thereon for the passage of the analog electrical signals; a second printed circuit board mounted in substantially parallel relationship to said first board and having a plurality of second electrically conductive tracks thereon for the passage of relay energizing signals; a plurality of reed relays each comprising a coiled conductor connected directly in series with one of said second tracks and responsive to a relay energizing signal thereon to produce magnetic flux, and at least one reed contact unit positioned outside of the coiled conductor and responsive to the magnetic flux produced by said coiled conductor to close normally open contacts therein, each of said reed contact units being mounted directly on said first board, the contacts within each said reed contact unit being connected directly in series with one of said first tracks whereby selective energization of one of said second tracks causes completion of a circuit through at least one of said first tracks to the measuring instrument.
Claim 3
Dependent Claim
20 words
A scanner unit according to claim 1 and further comprising means for mounting each coiled conductor on the second board.
Claim 4
Dependent Claim
25 words
A scanner unit according to claim 1 and further comprising means for securing the first and second boards to one another in spaced apart relationship.
Claim 5
Dependent Claim
48 words
A scanner unit according to claim 1 wherein each reed relay further includes magnetic circuit means for transmitting the flux produced by the coiled conductor to the reed contact unit, said magnetic circuit means comprising two pole pieces respectively positioned at opposite axial ends of the coiled conductor.
Claim 6
Dependent Claim
22 words
A scanner unit according to claim 4, wherein said pole pieces include spacer means for spacing apart said first and second boards.
Claim 7
Dependent Claim
98 words
A scanner unit according to claim 4, wherein, for each reed relay, the axis of said coiled conductor is parallel to the plane of said second board, and said pole pieces comprise respective plate-like members each having a respective first bent-over portion which extends axially into and is secured within the coiled conductor and towards the second bent-over portion which extends substantially parallel to the axis of the coiled conductor and towards the second bent-over portion of the other pole piece, said reed contact unit being positioned parallel to and adjacent a line joining the second bent-over portions.
Claim 8
Dependent Claim
59 words
A scanner unit as claimed in claim 4, wherein, for each reed relay, there is provided a core member upon which the coiled conductor is wound with its axis parallel to the plane of the second board, and wherein pole pieces and the core member are integrally formed from a plastics material loaded or filled with a ferromagnetic material.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |