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Reed Relay

IP.com Disclosure Number: IPCOM000091567D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Anderson, JL: AUTHOR

Abstract

Drawing A shows a reed relay having an evacuated envelope 2, reeds 3 and 4, and stationary conductive strips 5 and 6. Reed 3 has magnetizable region 7 and reed 4 has magnetizable region 8. Coil 9 is wound around envelope 2. The conductors of coil 9 are orthogonal to conductors 5 and 6 and the relay is operated by switching the magnetization through 90 degrees. Regions 7 and 8 are thin nickel-iron films having a hard magnetic axis aligned with magnetic field of coil 9 and an easy magnetic axis aligned with the magnetic fields of conductors 5 and 6. When coil 9 is energized, regions 7 and 8 are magnetized in their hard direction to have their north poles adjacent and their south poles adjacent. In this state, the reeds repel and the contacts open.

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Reed Relay

Drawing A shows a reed relay having an evacuated envelope 2, reeds 3 and 4, and stationary conductive strips 5 and 6. Reed 3 has magnetizable region 7 and reed 4 has magnetizable region 8. Coil 9 is wound around envelope 2. The conductors of coil 9 are orthogonal to conductors 5 and 6 and the relay is operated by switching the magnetization through 90 degrees. Regions 7 and 8 are thin nickel-iron films having a hard magnetic axis aligned with magnetic field of coil 9 and an easy magnetic axis aligned with the magnetic fields of conductors 5 and 6. When coil 9 is energized, regions 7 and 8 are magnetized in their hard direction to have their north poles adjacent and their south poles adjacent. In this state, the reeds repel and the contacts open.

While coil 9 is energized, a current is applied to conductive strips 5 and 6. The current in coil 9 is removed and the magnetization of regions 7 and 8 switches to the easy axis direction established by the current in strips 5 and 6. The current in strips 5 and 6 is then removed. Parallel currents in strips 5 and 6 cause regions 7 and 8 to be magnetized oppositely in their easy directions so that the two reeds attract. Antiparallel current in strips 5 and 6 cause regions 7 and 8 to be magnetized similarly so that they repel and maintain the contacts open. Current in reeds 3 and 4 is kept below the disturbed threshold of the magnetic material.

Drawing B shows a reed relay with stationary reed 12, stationary magn...