A key to realize an elastic sensor skin that covers the entire body of machines is removing metal wires to tactile sensing elements. Using wireless tactile sensing c:bips based on W connection is a hopefUl method, which was proposed recently. However, it is difficult to make the W tactile sensing element smaller than several millimeters because the energy transmission efficiency decreases as the chip size decreases. In this paper we propose a wireless tactile sensing element based on optical connection. The sensing chip with 1 mm cubic shape operates with optical power, and sends optical codes of 6 stress components measured by an optical sensing method. We describe the chip design and the 6 stress sensing principle, and show experimental results of the stress sensing using a prototype of a 4 mm cubic chip. Then we estimated the required optical power for the sensing chip, and checked the operation of the digital circuit on the chip.

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