A method for defining a numerically controlled tool path on a identified region of a solid computer model is disclosed. One of the radiation members has two protruding portions and front ends of the protruding portions are connected to principal electrodes of the semiconductor chips. A first pad portion is formed at a non-display area on a side of the device, and wires carrying scan signals are connected to the scan electrode lines at the first pad portion. A second transducer device has a second mechanical housing, which has an outer surface and an inner surface. Immediately after the fuel cut control is stopped, the index value indicating the burned gas amount is computed from the correlation stored in the electronic control unit based on the engine rotation speed NE. Since the heat generating portion is cooled down by the air sucked from the suction port by the suction device, it is possible to reduce a possibility of the heat of the heat generating section being transferred to the jetting head unit, and destabilizing an operation of the jetting head unit.