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Meets Strict Power, Efficiency, And Reliability Specifications
- Apr 25, 2018 -

The usual explanation for the tactile technology used for touch activation control is that the full action of a key or switch must be fully replicated to be most effective. But in reality, the sensitivity of human fingers is not so low. A large number of studies have found that if the appropriate acceleration is combined, the neurons of human fingers can detect very small movements. At accelerations above 1.5 g, only 0.1 mm of motion can be perceived by humans as a confirmation response. However, the minimum level of acceleration of 1.5g is not enough to produce the best haptic effect. A more effective haptic effect can be produced by generating an acceleration and a displacement with stronger stimuli. These accelerations and displacements can be seen through the "phase portraits" shown here. Phase diagrams can be generated after successful integration of haptics into the haptic interface device via electromechanical methods.

The best way is to use actuators specifically designed to produce haptic effects, because reusing a common motor and solenoid is very challenging. Actuators designed for haptic applications convert haptic signals from the controller into the mechanical motion described by a particular phase diagram. Obviously, in addition to providing a good dynamic response, selected actuators need to meet strict power, efficiency, and reliability metrics. The two actuators commonly used in mobile phones are also ideal for small touch-screen products (diagonal lengths below 7 inches). They are the eccentric rotary block motor (ERM) (shown in the photo) and the linear resonant actuator (LRA), where there is a mass vibrating between the two magnetic poles. Products with larger screens, such as those with 7-inch to 36-inch touch interfaces, require larger actuators. Immersion A100 and A300 are two such products.

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