Thin film inductive heads. From one to thirty one turns
L. Romankiw
ECS Meeting 1989
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
L. Romankiw
ECS Meeting 1989
Robert J. Von Gutfeld, M.H. Gelghinski, et al.
CLEO 1983
L. Romankiw
Electrochimica Acta
D.A. Thompson, L. Romankiw, et al.
IEEE Transactions on Magnetics