A Magnetically-Coupled Micromachined Electrostatic Energy Harvester Driven by Eye Blinking Motion

We present the fabrication and experimental results of a magnetically coupled body motion electrostatic energy harvester chip suitable for a smart contact lens application. The device is designed to be driven by the lateral motion of the eye blinking without any physical contact with the eyelid. The
$4\times 3\ \text{mm}^{2}$
harvester generates 486.54 nJ and
$6.09\ \mu \mathrm{J}$
of energy per blink and average power of 194.6 nW and
$2.44\ \mu \mathrm{W}$
when pre-charged at 3.18 V and 6.27 V, respectively when driven at typical blinking velocity conditions.