클리키 스위치 조작 시 피드백의 명확성을 정량화 하기 위한 햅틱프로파일 분석

초록

Objective: This study aims at investigating the physical factors associated with feedback clarity when operating a clicky switch by analyzing haptic profile. Background: The operating feeling has become more important in PUI. Previously, many studies on the effect of physical parameters of controller on the affective experience have been conducted. The preferred physical parameters such as peak force, stroke and friction has been revealed already in many studies. But there are few quantitative studies on the feeling of feedback clarity which plays an important role in improving the operating feeling. The clarity is a haptic feedback to notify the user if the controller was operated successfully. To investigate the appropriate level of clarity and to improve operating feeling, the quantitative indicators that associated with the perceived clarity needed to be revealed. Method: The reaction force and stroke are measured when a clicky switch was pressed in a constant and voluntary speed. The constant operation was conducted by linear actuator and the voluntary operations were conducted by five human subjects. Each subject was operated 20 times and haptic profile which consists of the force and the stroke was measured. Based on haptic profile, change rate of the force and stroke was further analyzed to extract the acceleration and the rate of force. Results: The reaction force and stroke changed drastically at a time when passing through click section and the acceleration and the rate of force were increased prominently and instantly at that moment. The acceleration can be suggested for physical factor that associated with feedback clarity because the acceleration directly activates a mechanoreceptor called Pacinian corpuscles in human skin. Conclusion: It is understood that the increased peak acceleration associated with the feeling of clarity. The further empirical studies on the preferred acceleration and level of clarity are needed in application area. Application: The results contribute to the design of haptic feedback on the PUI.

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