Samsung patents air filter that heats up to burn off dust

1. An electrostatic precipitator comprising: a charger configured to charge foreign substances introduced thereto; and a dust collecting sheet on which the charged foreign substances are collected, the dust collecting sheet comprising: a first electrode; a second electrode spaced apart from the first electrode to face the first electrode and on which the foreign substances passed through the charger are collected, wherein the second electrode formed of a material having an electrical resistance greater than an electrical resistance of the first electrode, and the first electrode and the second electrode are arranged to be overlapped with each other in a first direction; a first power connector electrically connected to the first electrode to apply a voltage to the first electrode; a second power connector electrically connected to the second electrode to apply a voltage having a potential difference with the first electrode, to the second electrode; a third power connector additionally electrically connected to the second electrode while not connecting to the first electrode, to apply additional voltage to allow the second electrode to generate heat; a first sheet to cover one surface of the first electrode and the second electrode in the first direction; and a second sheet to cover an other surface of the first electrode and the second electrode in the first direction, the second sheet including a connection hole opened in the first direction to connect the second electrode and the third power connector to each other so that the third power connector is in contact with the second electrode through the connection hole, wherein: the first power connector, the second power connector are arranged on the first sheet, and the third power connector is arranged on the second sheet; at least a portion of the third power connector is inserted into the connection hole and deposited in the second sheet thereby covering the connection hole; the at least a portion of the third power connector is in contact with at least a portion of the second electrode exposed to through the connection hole thereby electrically connecting the third power connector with the second electrode; and both of the second power connector, provided to generate an electric field between the first electrode and the second electrode, and the third power connector, provided to allow the second electrode to generate heat, are connected to the second electrode.