The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2018
Filed:
Jun. 05, 2017
Immersion Corporation, San Jose, CA (US);
Robert A. Lacroix, San Jose, CA (US);
Michael A. Greenish, Gryon, CH;
Erin B. Ramsay, Dollard-des-Ormeaux, CA;
Immersion Corporation, San Jose, CA (US);
Abstract
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.