Emergency stop pressure sensor, safety device, and safety system

A pressure sensor suitable for being installed in a moving body and suitable for being used with a control unit operative to shut power transmission to a driving source to the moving body in response to a detection signal from the sensor, the pressure sensor comprising:

• a pair of electrodes;
• and
• an intermediate layer disposed between the pair of electrodes, the intermediate layer comprising silicone or silicone rubber compound, the intermediate layer not having initial surface potential being configured to cause charging to occur between the intermediate layer and the electrodes and generate power when deformed by contact with a target object, wherein
• a proportion of Si-O bonds is increased by surface treatment of the intermediate layer, and
• the silicone rubber compound has siloxane linkage and has a concentration profile in which an oxygen content is increased from a side having a smaller degree of deformation, of the first side and the second side, toward an inside, to have a maximal value inside the intermediate layer, and a carbon content is decreased from the side having a smaller degree of deformation toward the inside, to have a minimal value inside the intermediate layer.