Patent ID: 7400153

Claim:
A detector for detecting an object being caught by a door, said detector comprising: detection electrodes; an insulating material insulating said detection electrodes from each other; a main body provided on an open end part of said door, said main body containing said detection electrodes and said insulating material; a sensor circuit which, together with said main body, forms a capacitance sensor having specified directionality; means for grounding said door; a shield electrode inside said main body, said shield electrode being open toward said detection surface, said detection electrodes being disposed inside said shield electrode; and a protective cover covering said shield electrode and said detection electrodes; wherein said main body includes a detection surface defined by said directionality and said detector further comprises means for grounding said door; and wherein said detection surface with said protective cover has a plurality of mutually adjacent protrusions with thickness decreasing in the direction of protrusion.