Immersion Corporation
Systems and methods for differential optical position sensing for haptic actuation

Abstract:

Systems and methods for differential optical position sensing for a haptic actuator are disclosed. In one embodiment, a system includes: an actuator configured to receive a drive signal and move an object to output a haptic effect; a first sensor configured to monitor a position of the object and output a first position signal; a second sensor configured to monitor the position of the object and output a second position signal different from the first position signal; a circuit configured to receive the first position signal and the second position signal and output a difference signal; and a processor configured to receive the difference signal and output a control signal to the actuator based on the difference signal.