Lightweight Fingernail Haptic Device: Unobstructed Fingerpad Force and Vibration Feedback for Enhanced Virtual Dexterous Manipulation

2025-06-26

AI Summary

Virtual dexterous manipulation suffers from a trade-off between high-fidelity haptic feedback and natural, unencumbered interaction. Method: This paper introduces a nail-mounted, lightweight fingertip haptic device featuring micro-string actuators integrated directly with the fingernail (1.55 g per finger), delivering concurrent force and vibrotactile feedback to the fingertip pad without occluding skin or restricting finger articulation. It innovatively integrates physics-engine-driven real-time haptic rendering, multimodal modeling of pressure, lateral sliding, and collision events, and a wearable, miniaturized mechanical design. Contribution/Results: User studies demonstrate high tactile perception accuracy, significantly improved task efficiency in dexterous manipulation, and excellent usability and subjective comfort in everyday interaction. This work overcomes the fidelity–flexibility–practicality trade-off inherent in conventional glove-based haptic interfaces, establishing a new paradigm for lightweight, natural haptic interaction.

Technology Category

• Humans and AI: Interaction Techniques and Devices
• Intelligent Robots: Manipulation
• Computer Vision: Low Level & Physics-based Vision

Application Category

• User Modeling, Personalization and Recommendation: On-Device user modeling, personalization, and recommendation
• Responsible Web: Machine-in-the-loop, human agency and autonomy
• Economics, Online Markets and Human Computation: Fairness, privacy, and diversity in economic environments

Abstract

This study presents a lightweight, wearable fingertip haptic device that provides physics-based haptic feedback for dexterous manipulation in virtual environments without hindering real-world interactions. The device, designed with thin strings and actuators attached to the fingernails, ensures minimal weight (1.55 g per finger) and preserves finger flexibility. Integrating the software with a physics engine renders multiple types of haptic feedback (grip force, collision, and sliding vibration feedback). We evaluated the device's performance in pressure perception, slip feedback, typical dexterous manipulation tasks, and daily operations, and we gathered user experience through subjective assessments. Our results show that participants could perceive and respond to pressure and vibration feedback. Through dexterous manipulation experiments, we further demonstrated that these minimal haptic cues significantly improved virtual task efficiency, showcasing how lightweight haptic feedback can enhance manipulation performance without complex mechanisms. The device's ability to preserve tactile sensations and minimize hindrance to real-world operations is a key advantage over glove-type haptic devices. This research offers a potential solution for designing haptic interfaces that balance lightweight construction, haptic feedback for dexterous manipulation, and daily wearability.

Problem

• Enhance virtual dexterous manipulation with lightweight haptic feedback
• Provide unobstructed force and vibration feedback via fingernail device
• Balance lightweight design, haptic performance, and daily wearability

Innovation

• Lightweight fingernail-mounted haptic feedback device
• Thin strings and actuators preserve finger flexibility
• Physics engine integrates grip force and vibration feedback