Patent ID: 11913436
Assignee: CAMBRIDGE MECHATRONICS LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G  H | IPC F  G  H

Claim 0:
1. A method of driving a shape memory alloy haptic assembly comprising an actuator comprising shape memory alloy that is arranged on actuation to provide a haptic effect,
the method comprising supplying drive current to the actuator successively during a pre-heating period in which the temperature of the shape memory alloy is raised without causing the shape memory alloy to provide the haptic effect and during an actuation period in which the temperature of the shape memory alloy is raised so as to cause the shape memory alloy to provide the haptic effect, wherein the drive current has a lower time-averaged power during at least part of the pre-heating period than during the actuation period.