US 9,811,194 B2
Touch interface device and methods for applying controllable shear forces to a human appendage
Michael A. Peshkin, Evanston, IL (US); and J. Edward Colgate, Evanston, IL (US)
Assigned to Northwestern University, Evanston, IL (US)
Filed by NORTHWESTERN UNIVERSITY, Evanston, IL (US)
Filed on Jun. 9, 2015, as Appl. No. 14/734,868.
Application 14/734,868 is a continuation of application No. 13/468,695, filed on May 10, 2012, granted, now 9,122,325.
Claims priority of provisional application 61/484,544, filed on May 10, 2011.
Claims priority of provisional application 61/484,564, filed on May 10, 2011.
Prior Publication US 2015/0301673 A1, Oct. 22, 2015
Int. Cl. G06F 3/041 (2006.01); G06F 3/01 (2006.01); G06F 3/044 (2006.01); G06F 3/045 (2006.01); G06F 3/046 (2006.01)
CPC G06F 3/0414 (2013.01) [G06F 3/016 (2013.01); G06F 3/041 (2013.01); G06F 3/044 (2013.01); G06F 3/045 (2013.01); G06F 3/046 (2013.01); G06F 3/0412 (2013.01); G06F 3/0416 (2013.01); G06F 2203/04101 (2013.01); G06F 2203/04105 (2013.01); G06F 2203/04112 (2013.01); G06F 2203/04113 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A touch interface device comprising:
a touch surface;
a sensor that measures a plurality of locations when the touch surface is touched by a plurality of appendages of an operator;
one or more actuators coupled with the touch surface that move the touch surface in a swirling motion;
a plurality of electrodes disposed below the touch surface and an insulating layer on the electrodes;
an electronic controller that controls voltage on the electrodes;
wherein an electrostatic normal force acts on each of the plurality of appendages, the electrostatic normal force being controlled by adjusting the voltage applied to each of the plurality of appendages by each electrode lying beneath the appendage,
wherein the electrostatic normal force generated by the voltage applied to each of the plurality of appendages is synchronized with the swirling motion by basing a frequency of the swirling motion on the frequency of application of the electrostatic normal force such that a distinct persistent shear force is simultaneously applied to each of the respective plurality of appendages.