Eccentric rotating mass actuator optimization for haptic effect

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United States of America Patent

PATENT NO 9921656
SERIAL NO

15613709

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Abstract

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A system that generates a haptic effect using an Eccentric Rotating Mass (“ERM”) actuator determines a back electromotive force (“EMF”) of the ERM actuator during operation of the device and receives a haptic effect signal including one or more parameters, where one of the parameters is a voltage amplitude level as a function of time. Based on the determined back EMF, the system determines if the ERM actuator is spinning and varies the voltage amplitude level based on the back EMF to generate a varied haptic effect signal, where the varying includes, when the ERM actuator is determined to be spinning, reducing the voltage amplitude level compared to when the ERM actuator is determined to not be spinning. The system then applies the varied haptic effect signal to the ERM actuator.

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Patent Owner(s)

  • IMMERSION CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Greenish, Michael A Gryon, CH 8 44
Lacroix, Robert A San Jose, US 39 1285
Ramsay, Erin B Dollard-des-Ormeaux, CA 39 1461

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