公开(公告)号：US3900817A

公开(公告)日：1975-08-19

申请号：US42363373

申请日：1973-12-10

Applicant: XEROX CORP

Inventor： PUNT VERNON E

IPC: H01C10/04 ,  H01C10/28 ,  H01C5/04

CPC classification number: H01C10/04 ,  H01C10/28

Abstract: A potentiometer having as an input a manually controlled, bearing supported conducting sphere which, when rotated simultaneously varies two resistances representative of an X coordinate and a Y coordinate. The potentiometer comprises a first stationary outer partial sphere on the inner surface of which is carried a continuous helical strip of conductive material. A stationary insulating ball surface is located interior of said outer sphere and carries a second strip of conductive material on its outer surface. A second sphere is supported for rotational movement intermediate the first sphere and ball surface on a plurality of ball bearings, two of which are made of a conductive material. By moving the second sphere either one of the resistances may be varied independently of each other, or both may be varied simultaneously.