M. Datta, L. Romankiw, et al.
JES
A keyboard which minimizes electrical interconnections and is naturally suited for microprocessor applications has been developed using a magnetoacoustic delay line. The delay line utilizes a 2 µmeter magnetostrictive 50:50 NiFe plating on a 125 µmeter BeCu wire, fabricated with a circumferential easy axis. The wire is formed in a serpentine shape to pass under all the keys. The keys contain low-intensity molded permanent magnets which can rotate the magnetization from the circumferential direction. An interrogation current pulse in the wire generates acoustic waves under each depressed key, which propagate to a sense coil where the torsional waves are sequentially sensed. Each interrogation pulse from the microprocessor produces a list with the status of every key. © 1979 IEEE
M. Datta, L. Romankiw, et al.
JES
J.S.-Y. Feng, L. Romankiw, et al.
IEEE Transactions on Magnetics
L. Romankiw
ECS Meeting 1989
M. Datta, J.C. Andreshak, et al.
JES