An electric double layer capacitor is disclosed which is capable of preventing transmission of an electrolytic solution vaporized in a basic cell through current collectors and capable of improving a yield. This circuitry is coupled between the sensor and the power source of the controller, and includes a first thermistor to protect the sensor from a power surge from the controller andor power source. The eyewear end piece may further include an insertion hole for a temple which extends through the first hard member and the flexible member to the second hard member. A homopolar rotor is configured to rotate within the magnetic field such that a rotating magnetic field is created in a stationary winding by interaction of the rotating permeance wave produced by the homopolar rotor and the magnetic field produced by the single stationary field coil. This light diffraction decreases the contrast ratio of the micromirror.