An oscillation apparatus corrects a setting value for an output frequency based on a detection result of an environmental temperature. Antenna pattern control is maintained by employing orthogonal polarization orientation for every other beam. The ends of the guide wire and the tubular instrument are placed into the groove and moved toward each other. All upper electrodes 7c of the plural ferroelectric capacitors 7 to be connected to a common plate line P are connected to one another by an upper wiring layer 91. The braking mechanism includes a catch that is rotatable relative to the drum assembly about a second axis that is not concentric with the first axis. The scanning face is tiltable relative to a selected plane of the tubular by rotation of the probe support about the axial axis of the probe house.