Augmentation of Thermal Sensation on Finger Pad Using Stimuli for Finger Side
This paper proposes a thermal display that can present a virtual thermal sensation to the finger pad using thermal stimuli on the finger side. The author developed the prototype device and evaluated the perceived strength of the thermal sensation on the f
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Abstract. This paper proposes a thermal display that can present a virtual thermal sensation to the finger pad using thermal stimuli on the finger side. The author developed the prototype device and evaluated the perceived strength of the thermal sensation on the finger pad after the pad makes contacts with an object. The results confirm that users perceive hot or cold sensation even if there are no thermal stimuli on the finger pad by presenting stimuli to the finger side. Furthermore, the proposed method successfully improves thermal sensation by applying the same thermal stimuli to the finger side as the sensation on the finger pad. Keywords: Thermal display Augmented reality
Thermal perception
Virtual reality
1 Introduction Presentation of the thermal sense, by which a human can perceive an object’s temperature and material, has been a great challenge in the development of haptic displays. Because it has been revealed that the thermal sense is one of the important properties in human texture perception [1, 2], many haptic displays that can present not only skin deformations or vibrations, but also temperature change, have been developed [3–5]. These displays mainly place thermal devices on a finger pad because users can perceive haptic sensation on their finger pad. The aim of this study is to develop a thermal display that does not have thermal devices on the user’s finger pad, but can present thermal sensation on the pad. If there is no thermal device on the finger pad, the author expects mainly two advantages compared with conventional thermal displays. First, we can realize a thermal augmentation haptic device, such as a vibrotactile augmentation device, that uses a vibrator on the fingernail [6]. We can change the thermal sensation when a user touches real objects in order to perceive them as being made from a different material. For example, when the user touches with the finger pad an object made from wood, the cold sensation presented from the thermal device could cause the user to perceive the object as though it were metal. Second, the thermal device can be easily integrated with other haptic devices, such as vibrators and electrotactile displays, in order to realize haptic groves that represent various sensations. For example, when we integrate conventional thermal displays with vibrators, we have to place the thermal display on the vibrators, and such display then disturbs the quality of the vibrotactile sensation. In another case, © Springer International Publishing Switzerland 2016 F. Bello et al. (Eds.): EuroHaptics 2016, Part I, LNCS 9774, pp. 512–520, 2016. DOI: 10.1007/978-3-319-42321-0_48
Augmentation of Thermal Sensation on Finger Pad
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Fig. 1. Conceptual diagram for proposed thermal display
when thermal and electrotactile displays are integrated, perceiving the thermal sensation becomes difficult because the electrodes are placed between the thermal display and the pad. Placing thermal devices outside the pad can solve these problems. In order to develop such thermal display, the author f
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