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Sensors 2014, 14(2), 2225-2238; doi:10.3390/s140202225
Article

A Two-Ply Polymer-Based Flexible Tactile Sensor Sheet Using Electric Capacitance

1,2,* , 1
,
1,2
 and
2
1 Tokai Rubber Industries, Ltd., 1 Higashi, 3-chome, Komaki-shi, Aichi-ken 485-8550, Japan 2 RIKEN-TRI Collaboration Center for Human-Interactive Robot Research, RIKEN, 2271-130, Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-0003, Japan
* Author to whom correspondence should be addressed.
Received: 24 December 2013 / Revised: 14 January 2014 / Accepted: 23 January 2014 / Published: 29 January 2014
(This article belongs to the Special Issue Tactile Sensors and Sensing Systems)
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Abstract

Traditional capacitive tactile sensor sheets usually have a three-layered structure, with a dielectric layer sandwiched by two electrode layers. Each electrode layer has a number of parallel ribbon-like electrodes. The electrodes on the two electrode layers are oriented orthogonally and each crossing point of the two perpendicular electrode arrays makes up a capacitive sensor cell on the sheet. It is well known that compatibility between measuring precision and resolution is difficult, since decreasing the width of the electrodes is required to obtain a high resolution, however, this may lead to reduction of the area of the sensor cells, and as a result, lead to a low Signal/Noise (S/N) ratio. To overcome this problem, a new multilayered structure and related calculation procedure are proposed. This new structure stacks two or more sensor sheets with shifts in position. Both a high precision and a high resolution can be obtained by combining the signals of the stacked sensor sheets. Trial production was made and the effect was confirmed.
Keywords: capacitive tactile sensor; tactile sensor; flexible sensor; polymer; conductive rubber; screen printing capacitive tactile sensor; tactile sensor; flexible sensor; polymer; conductive rubber; screen printing
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Guo, S.; Shiraoka, T.; Inada, S.; Mukai, T. A Two-Ply Polymer-Based Flexible Tactile Sensor Sheet Using Electric Capacitance. Sensors 2014, 14, 2225-2238.

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