In this paper, we consider a virtual tennis as an application of virtual reality. In such an application, not only a visual display but also a force display is an important device. This device should have its large feasible area, high speed, high acceleration, force presentation to an operator and safety simultaneously. Then, we propose a new type force display system using a parallel wire drive mechanism. Because this force display has some advantages of its low inertia and simple structure, its good performance is expected. In this paper, we firstly specify details of the virtual tennis system, including an HMD (Head Mounted Display). Secondly, we describe a new method to investigate the feasible area of the proposed force display. Also, an easy procedure of calculating desired wire tension is proposed. Finally, we demonstrate some basic experimental results to verify performance of the proposed display.
