FreelForce: Reel-type Force Feedback Device with HMD for Smooth and Quick Transitions

Many force feedback devices have been proposed to enhance the immersive experience of VR. However, force feedback is not always necessary in VR and the user sometimes tries to touch physical objects with their bare hands when in the pass-through mode. We propose “FreelForce,” a device that combines an HMD and a reel strap to enable smooth and quick transitions from a hands-free state to a state where force feedback can be experienced. Three types of accessories and applications are implemented to expand the input functionality for the mixed environment of VR/MR and everyday life and to explore the design space of the technique.