## 1 Introduction  
Human tactile perception is surprisingly sensitive. In particular, the finger is a body part with the highest density of tactile receptors, and it can acquire information necessary for manual manipulation tasks, such as texture, shape, and weight, when it touches an object [1]. However, tactile information such as the texture and the shape of an object is drastically degraded for people who must wear gloves on their hands for work and may hinder their ability to work effectively.  
One solution to these problems is to transfer the sensation of the fingertip to a body part. One reason for not presenting the tactile information on the fingertips is the unavailability of small actuators that do not interfere with the fingertip movement. Such devices are also large and complicated. If the fingertips are not used as a presentation target, a large-area presentation device can be placed, for example on the back. This can overcome the issue of the size of the actuator in the haptic device and allows the user to work without hindering the movement of the fingertips.  
Tactile transfer is a common method in the study of sensory feedback-enabled prosthetic hands, and there have been many attempts to place vibrators on the arms and shoulders [2]. Furthermore, as an example of the application of tactile transfer techniques, a new tactile presentation method in a virtual reality (VR) environment has been proposed to transfer the tactile sensation of the fingertips to the arm and face [3; 4; 5]. However, few of these devices aimed to replace the ability of the fingertips with other parts of the body, and they only convey the sense of touch symbolically.  
A two-fingered glove is developed as described in [6] that can sense the pressure distribution of a fingertip with a 2 mm interval, which is equivalent to or less than the discrimination threshold of two points on the fingertip [1]. By using the glove, the pressure distribution is transferred to the back, in combination with 144 eccentric vibration motors placed on the back and the abdomen [7]. They focused on the back because the number of discriminable points on the back is greater than the number of discriminable points on the fingertips. Additionally, it is not difficult to attach or detach the device from the back even if it is large and heavy, unlike the case with the arms and other parts of the body. Because the eccentric vibration motor has a low frequency response (150 ms) as described by [7], another prototype was also developed using 100 voice-coil type vibrators with a higher frequency response (1 ms) [8]. A prototype using a voice-coil type vibration motor showed that it is possible to support the tactile perception ability of the fingertips by transferring the fine tactile signal that is obtained from the fingertips to the back.  
In this study, we developed a haptic vest installed with 80 voice-coil type vibrators, and a sensing glove that can detect up to 100 points of fingertip pressure distribution with an interval of 2 mm. We examined whether objects were correctly identified when the tactile signal from the fingers was mapped to the back (Figure 1). A new drive method using a shift-register is proposed and implemented to drive all the vibrators independently at different amplitudes and frequencies, although it is necessary to provide an appropriate AC signal to the voice coil type transducers independently. In this study, we first evaluated the hardware of the developed devices, and finally conducted two types of experiments to evaluate the performance of the device. We found that the objects were identified correctly in the gloved and haptic vest state when compared to the case without the haptic vest (without tactile transfer to the back).