In this paper we describe a tactile transducer device that is optimized from biomechanical data and that has a compact, yet modular design. The tactile transducer comprises a 6 × 10 piezoelectric bimorph actuator array with a spatial resolution of 1.8 mm × 1.2 mm and has a wide temporal bandwidth. The actuator mounting method was improved from a conventional cantilever method to a dual-pinned method, giving the actuator the ability to deform the glabrous skin maximally during laterotactile stimulation. The results were validated by asking subjects to detect tactile features under a wide range of operating conditions. The tactile display device is modular, makes use of ordinary fabrication methods, and can be assembled and dismantled in a short time for debugging and maintenance. It weighs 60 g, it is self-contained in a 150 cm 3volume and may be interfaced to most computers, provided that two analog outputs and six digital I/O lines are available. Psychophysical experiments were carried out to assess its effectiveness in rendering virtual tactile features.
André, T., Lefèvre, P. and Thonnard, J.-L. ( 2009). A continuous measure of fingertip friction during precision grip. Journal of Neuroscience Methods, 179(2): 224-229.
2.
Biggs, J. and Srinivasan, M.A. ( 2002). Tangential versus normal displacements of skin: relative effectiveness for producing tactile sensations. Proceedings of the 10th International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, pp. 121-128.
3.
Bliss, J., Katcher, M., Rogers, C. and Shepard, R. ( 1970). Optical-to-tactile image conversion for the blind. IEEE Transactions on Man-Machine Systems, 11(1): 58-65.
4.
Van Boven, R.W., Hamilton, R.H., Kauffman, T., Keenan, J.P. and Pascual-Leone, A. ( 2000). Tactile spatial resolution in blind braille readers. Neurology, 54: 2230-2236.
5.
Campion, G., Wang, Q. and Hayward, V. ( 2005). The Pantograph Mk-II: a haptic instrument. Proceedings of the IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS’05), pp. 723-728.
6.
Carter, O., Konkle, T., Wang, Q., Hayward, V. and Moore, C.I. ( 2008). Tactile rivalry demonstrated with an ambiguous apparent-motion quartet. Current Biology, 18(14): 1050- 1054.
7.
Craig, J.C. and Johnson, K.O. ( 2000). The two-point threshold: not a measure of tactile spatial resolution. Current Directions in Psychological Science, 9: 29-32.
8.
Drewing, K., Fritschi, M., Zopf, R., Ernst, M.O. and Buss, M. ( 2005). First evaluation of a novel tactile display exerting shear force via lateral displacement. ACM Transactions on Applied Perception, 2(2): 118-131.
9.
Ghodssi, R., Beebe, D.J., White, V. and Denton, D.D. ( 1998). Development of a tangential tactor using a LIGA/MEMS linear microactuator technology. Proceedings of the MicroElectro-Mechanical Systems (MEMS) International Mechanical Engineering Congress and Exposition, Microelectromechanical Systems, Vol. DSC 59, pp. 379-386.
10.
Hasser, C.J. and Weisenberger, J.M. ( 1993). Preliminary evaluation of a shape-memory-alloy tactile feedback display. Proceedings of the Symposium on Haptic Interfaces in Virtual Environments and Teleoperator Systems, ASME Winter Annual Meeting, Vol. DSC 49, pp. 73-80.
11.
Hayward, V. and Cruz-Hernandez, M. ( 2000). Tactile display device using distributed lateral skin stretch. Proceedings of the Haptic Interfaces for Virtual Environment and Teleoperator Systems Symposium, Vol. DSC 69-2, pp. 1309-1314.
12.
Iwamoto, T. and Shinoda, H. ( 2005). Ultrasound tactile display for stress field reproduction-examination of non-vibratory tactile apparent movement. Proceedings of the First Joint Eurohaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, World Haptics 2005, pp. 220-228.
13.
Johnson, K.O. and Hsiao, S.S. ( 1992). Neural mechanisms of tactual form and texture perception . Annual Review of Neuroscience, 15: 227-250.
14.
Johnson, K.O. and Phillips, J.R. ( 1981). Tactile spatial resolution: I. Two-point discrimination, gap detection, grating resolution, and letter recognition. Journal of Neurophysiology, 46: 1177-1192.
15.
Johnson, K.O., Yoshioka, T. and Vega-Bermudez, F. ( 2000). Tactile functions of mechanoreceptive afferents innervating the hand. Journal of Clinical Neurophysiology, 17: 539- 558.
16.
Jungmann, M. and Schlaak, H.F. ( 2002). Miniaturized electrostatic tactile display with high structural compliance. Proceedings of Eurohaptics2002, pp. 12-17.
17.
Benali-Khoudja, M., Hafez, M., Alexandre, J.-M., Kheddar, A. and Moreau, V. ( 2004). Vital: a new low-cost vibrotactile display system. Proceedings of the IEEE International Conference on Robotics and Automation, Vol. 1, pp. 721-726.
18.
Kikuuwe, R., Sano, A., Mochiyama, H., Takesue, N. and Fujimoto, H. ( 2005). Enhancing haptic detection of surface undulation. ACM Transactions on Applied Perception, 2(1): 46-67.
19.
Konkle, T., Wang, Q., Hayward, V. and Moore, C.I. ( 2009). Motion aftereffects transfer between touch and vision . Current Biology, 19(9): 745-750.
20.
Konyo, M., Tadokoro, S. and Takamori, T. ( 2000). Artificial tactile feel display using soft gel actuators . Proceedings of IEEE International Conference on Robotics and Automation, pp. 3416-3421.
21.
Lamb, G.D. ( 1983). Tactile discrimination of textured surfaces: psychophysical performance measurements in humans. Journal of Physiology , 338: 551-565.
22.
Levesque, V. and Hayward, V. ( 2003). Experimental evidence of lateral skin strain during tactile exploration. Proceedings of Eurohaptics2003, pp. 261-275.
23.
Levesque, V. and Hayward. V. ( 2008). Tactile graphics rendering using three laterotactile drawing primitives. Proceedings of the 16th Symposium on Haptic Interfaces For Virtual Environment and Teleoperator Systems, pp. 429-436.
24.
Levesque, V., Pasquero, J. and Hayward, V. ( 2007). Braille display by lateral skin deformation with the STRESS2 tactile transducer. Proceedings of the Second Joint Eurohaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, World Haptics 2007, pp. 115-120.
25.
Levesque, V., Pasquero, J., Hayward, V. and Legault, M. ( 2005). Display of virtual braille dots by lateral skin deformation: feasibility study. ACM Transactions on Applied Perception , 2(2): 132-149.
26.
Moy, G., Wagner, C. and Fearing, R.S. ( 2000) A compliant tactile display for teletaction. Proceedings of the IEEE International Conference on Robotics and Automation, pp. 3409-3415.
27.
Pasquero, J. ( 2006). Survey on Communication through Touch. Technical Report TR-CIM 06.04, Center for Intelligent Machines, McGill University .
28.
Pasquero, J. and Hayward, V. ( 2003). STRESS: a practical tactile display system with one millimeter spatial resolution and 700 Hz refresh rate. Proceedings of Eurohaptics, pp. 94-110.
29.
Pasquero, J., Luk, J., Levesque, V., Wang, Q., Hayward, V. and MacLean, K.E. ( 2007). Haptically enabled handheld information display with distributed tactile transducer. IEEE Transactions on Multimedia , 9(4): 746-753.
30.
Petit, G., Dufresne, A., Levesque, V., Hayward, V. and Trudeau, N. ( 2008). Refreshable tactile graphics applied to schoolbook illustrations for students with visual impairment. Proceedings of the 10th International ACM SIGAC-CESS Conference on Computers and Accessibility , ASSETS 2008, pp. 89-96.
31.
Sarakoglou, I., Tsagarakis, N. and Caldwell, D.G. ( 2005). A portable fingertip tactile feedback array: transmission system reliability and modelling. Proceedings of the First Joint Eurohaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, World Haptics 2005, pp. 547-548.
32.
Smits, J.G., Dalke, S.I. and Cooney, T.K. ( 1991). The constituent equations of piezoelectric bimorphs. Sensors and Actuators A, 28: 41-61.
33.
Tang, H. and Beebe, D.J. ( 1998). A microfabricated electrostatic haptic display for persons with visual impairments. IEEE Transactions on Rehabilitation Engineering, 6(3): 241-248.
34.
Velazquez, R., Pissaloux, E., Hafez, M. and Szewczyk, J. ( 2005). A low-cost highly-portable tactile display based on shape memory alloy micro-actuators. Proceedings of the IEEE International Conference on Virtual Environments, Human-Computer Interfaces, and Measurement Systems, VECIMS 2005, pp. 121-126.
35.
Wagner, C.R., Lederman, S.J. and Howe, R.D. ( 2004). Design and performance of a tactile shape display using RC servomotors. Haptics-e, 3(4).
36.
Wang, Q. and Hayward, V. ( 2006). Compact, portable, modular, high-performance, distributed tactile transducer device based on lateral skin deformation. Proceedings of the Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, pp. 67-72.
37.
Wang, Q. and Hayward, V. ( 2007). In vivo biomechanics of the fingerpad skin under local tangential traction. Journal of Biomechanics, 40(4): 851-860,
38.
Wang, Q. and Hayward, V. ( 2008). Tactile synthesis and perceptual inverse problems seen from the view point of contact mechanics. ACM Transactions on Applied Perception, 5(2): 1-19.
39.
Wang, Q., Kong, L., Sprigle, S. and Hayward, V. ( 2006a). Portable gage for pressure ulcer detection. Proceedings of the IEEE Engineering in Medicine and Biology Society Conference, EMBC’06, pp. 5997-6000.
40.
Wang, Q., Levesque, V., Pasquero, J. and Hayward, V. ( 2006b). A haptic memory game using the STReSS2 tactile display . Proceedings of the ACM 2006 Conference on Human Factors in Computing Systems, CHI 2006 , pp. 271-274.
41.
Wellman, P., Peine, W., Favalora, G. and Howe, R.D. ( 1998). Mechanical design and control of a high-bandwidth shape memory alloy tactile display. Experimental Robotics V, Casals, A. and de Almeida, A. T. (eds) (Lecture Notes in Control and Information Science, Vol. 232). Berlin, Springer, pp. 56-66.
