Design of Miniature Tactile Module for Walking Navigation in a Mobile Device

Yang Tae Heon; Kyoungbog Jin; 박원형; Sang-Youn Kim

According to demands for tactile feedback in mobile devices, vibration motors have been used to convey tactile sensation, because the vibration motor is small and consumes low power. However, the vibration motor is not sufficient to generate fruitful tactile sensation. In this paper, we propose a new miniature tactile actuator using elastic restoring and electromagnetic force for providing minute and various tactile sensation in the mobile devices. The proposed tactile actuator consists of a solenoid, a permanent magnet, and an elastic spring. There is an interaction force between the solenoid and the permanent magnet in the proposed actuator. This interaction force is combined with elastic restoring force from the elastic spring to maximize the tactile feedback. Since two forces contribute to the actuation of the proposed motor, the presented tactile actuator can create strong enough force to stimulate human skin in small-sized devices and furthermore it consumes low power. Therefore, tactile actuator satisfies the specification to create haptic sensation (contactors' stroke, output force and working frequency). By connecting the nine actuators to the multilayered elastic springs, we can easily design a miniature tactile module. We measure the output force and the amplitude of the proposed module according to frequency variation in order to investigate that the proposed module create enough force to stimulate human mechanoreceptors over a wide frequency range. Through the experiments, the proposed module has good potential in walking navigation systems.

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* 2022년 이후 발행 논문의 참고문헌은 현재 구축 중입니다.

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