Basic Study for Haptic Interface System Considered Human Sensory Characteristics

点击翻译按钮获取中文摘要

Haptic Interfaces are necessary for a human interface system with bilateral communication between the real world and the virtual world through somatosensory information such as cutaneous and kinesthetic senses. The haptic interfaces are also important to increase the reality of cyber space composed of visual and auditory displays. So we performed haptic interface studies which concerned the development of tactile displays for presenting quality of materials and a wearable force display using a metal hydride actuator. These displays were designed on the basis of psychophysical experiments regarding haptic perception. First, we quantified the JND (just noticeable difference) of human spatial perception with touch sense and obtained the necessary and sufficient control accuracy, for designing haptic display system. Second, we measured how accurately subjects moved their finger to the exact location where virtual object appeared through a see-through head-mounted display. From the experime … More ntal result, it was found that there were depth gaps between fingers (real objects) and virtual objects. Although the location of the finger did not correspond with that of the virtual, there was a range where the subjects did not perceive the gap between their fingers and virtual objects when tactile feedback presented. It would appear that the reason for this improvement was the integration between visual and tactile information. Third, we obtained the optimal contact pressure and sweeping velocity to produce the sensation of roughness when subjects passively touched rough surfaces and were simulated by rough surfaces using a Braille display in order to design a tactile texture display which may present the sensation of roughness. From the experimental results, it was found that subjects could perceive roughness most easily when material surfaces were pressed and sweep onto the finger at 50 gf and 40 mm/s in both real rough surfaces and simulated surfaces. Moreover we found that our tactile display could present roughness sensation as same as #40 (540 μm)〜#190 (83 μm) sandpaper did. Finally, we discussed some problems to be solved for the advanced haptic interface and for its application to the field of assistive technology. Less