×

KEYBOARD FOR CALCULATING MACHINES, TELEPRINTERS, TERMINALS AND THE LIKE

  • US 3,641,568 A
  • Filed: 08/31/1970
  • Issued: 02/08/1972
  • Est. Priority Date: 09/01/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. In a keyboard for calculating machines, teleprinters, data terminals and the like having a magnetic circuit and means for generating a magnetic flux therein, means for causing and detecting a variation in said magnetic flux in correspondence with the depression of each key of said keyboard comprising a ferromagnetic plate in said magnetic circuit, said ferromagnetic plate having a plurality of ferromagnetic plate openings therethrough, a plurality of detecting windings disposed about said ferromagnetic plate openings in accordance with a predetermined digital code, and a plurality of ferromagnetic elements, each said ferromagnetic element being operatively attached to one of said keys and associated with one of said ferromagnetic plate openings, each said ferromagnetic element being movable through said associated ferromagnetic plate opening in response to the depressing of said key whereby an electromotive force is generated at the ends of said detecting windings.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×