Coated Magnetically Biased Reed Switch.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent relates to a small reed switch having a glass tubularly shaped envelope containing a pair of reed contacts which is modified to ensure its being biased to either an open or a closed position. A donut-shaped piece of a rubber-bonded, barium-ferrite, magnetic material is circumferentially mounted on the reed switch at a position where its magnetic field influences the contacts to an open position or a closed position. Thusly arranged, an actuating magnet, having a sufficient field at a single pre-established distance from the contacts, actuates the switch from all radial directions from the switch. Potting the modified switch in an epoxy resin further ensures a greater reliability and makes it ideal for implantations in laboratory animals.
- Electrical and Electronic Equipment
- Biomedical Instrumentation and Bioengineering