FAQ

RMA uses the principle of electromagnetic induction. When the distance between the magnets changes due to external input, the magnetic field changes, which induces an electromotive force(voltage) in the coil. By analyzing the waveform of this voltage signal, it is possible to determine whether a touch has occurred.

While capacitive sensors can recognize the contact position of a finger, RMA's input detection relies on detecting physical displacement. Although detection sensitivity can be adjusted via software, a single element has limitations in identifying the specific coordinates of the location pressed by the user. However, by placing the actuator at the point where surface displacement is greatest due to the mechanical structure and applying optimal sensitivity tuning, it is possible to effectively implement local input functions for a specific area, even if full coordinate recognition is not possible.

The low-frequency range can be used for haptic vibration, while the mid- to high-frequency range can be used for sound output. When a driver with a DSP is used, the two signals can be appropriately mixed and controlled.

Haptic vibration is most effectively delivered when the surface touched by the user is structured to allow fine physical vibration. If the panel is too heavy, has very high stiffness, or is firmly fixed at multiple points so that it can barely move, the haptic sensation felt at the fingertips may become very weak or practically imperceptible, even if the actuator generates vibration. Therefore, to achieve optimal haptic performance, it is recommended to apply a suspension structure that allows the panel to move slightly.

This explanation is based on the AC/PC-160-064 model.