스위치의 햅틱프로파일 설계변수가 피드백 명확성에 미치는 영향

Abstract

Objective: This study aims at investigating the major design parameter of haptic profile associated with perceived feedback clarity during operation the clicky switches. Background: A feeling of feedback clarity plays an important role in PUI to improve the user satisfaction and usability. Appropriate level of feedback clarity needs to be revealed when operating a PUI in the context of product use. The feedback clarity is associated with the 'drop force' which is observable in the haptic profile. Also, it is associated with the 'acceleration' resulting from physical interaction between the controller and the body. But detailed physical properties of controller effect on the acceleration and the perceived feedback clarity has not been revealed yet. The haptic profile is useful method to define the design parameters of controller in quantitative manner. Method: Two design parameters, Drop Size and Drop Rate, both are composing the 'drop force' at the haptic profile are defined. Drop size means that the quantities of a dropped force and the Drop Rate mean that the slope of drop curve. Ten experimental switches having different design parameters are designed and manufactured. A separate experiment, measuring the acceleration and perceived feedback clarity has performed respectively. Results: A strong correlation (r=0.957) was observed between the Drop Size and the feedback clarity. However, relatively moderate correlation (r=0.673) was observed between the Drop Rate and feedback clarity. It is means that the feedback clarity strongly affected by the Drop Size rather than the Drop Rate. Meanwhile, the correlation between the feedback clarity and the acceleration was almost perfect (r=0.984) which means the increased acceleration directly affecting the feeling of feedback clarity. Conclusion: This study suggests design strategies of PUI to achieve the preferred feedback clarity level by changing of haptic profile. Application: The results contribute to the design a PUI having satisfied level of feedback clarity.