Patent ID: 8339131

Claim:
An electric field sensor comprising: a planar substrate extending in a horizontal plane and a vertical plane having an insulating surface extending in the horizontal plane; at least two anchors being fixed on the insulating surface in the horizontal plane; at least two thermal actuators integrated with the anchors, wherein the thermal actuator is a clamp-clamp beam with a hump or a U-shape thermal actuator, wherein the beam extends parallel with the horizontal plane of the substrate; a shielding electrode and a sensing electrode being comb shape and extending in the horizontal plane, the shielding electrode supported by the thermal actuators without isolation and the shielding electrode is driven by the at least two thermal actuators to vibrate vertically up and down periodically, wherein the vibration direction of the shielding electrodes is perpendicular to the horizontal plane of the substrate and parallel with the vertical plane of the substrate.