Force invariant touch sensitive actuator

Details Force invariant touch sensitive actuator Force invariant touch sensitive actuator

2010-10-04

2011-10-18

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Electric switch in the supply circuit

C315SDIG002, C345S173000, C323S904000, C307S119000

Reexamination Certificate

active

08040080

ABSTRACT:
A user interface for a lighting control has a touch sensitive front surface; a four-wire resistive touch pad responsive to a point actuation on the front surface, the touch pad having a longitudinal resistive element for providing a first control signal representative of the position of the point actuation along the longitudinal axis, and a lateral resistive element for providing a second control signal representative of the position of the point actuation along the lateral axis; a controller receiving the first and second control signals; a first capacitor coupled between the lateral resistive element and a circuit common that charges and discharges through the longitudinal resistive element of the resistive touch pad to stabilize the first control signal; and first, second, and third switches controlled by the controller to provide a DC supply voltage to the resistive elements and to couple a respective resistive element to the controller. The controller determines, from the second control signal, if the touch sensitive front surface is presently being actuated, and determines, from the first control signal, the position of the point actuation along the longitudinal axis.

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