| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an object detector for accurately obtaining relative relationship of a receiving time of a plurality of reflection waves and accurately detecting the position of an object of a detection object. Ž<P>SOLUTION: The object detector for detecting the position of the object based on a reflection wave from the object for a transmitting ultrasonic wave includes: a plurality of receiving parts for receiving the ultrasonic wave reaching a plurality of receivers arranged at respective different positions as a receiving signal F composed of a plurality of vibration waveforms respectively; a reference waveform specifying part for specifying at least one waveform out of the plurality of the vibration waveforms VF as a reference waveform VR by regarding the receiving signal F received with one receiving part as a reference receiving signal FR; an object waveform detecting part for detecting the vibration waveform VF having the most approximate characteristics as the reference waveform VR from receiving signals F2, F3 received with the other receiving parts as the object waveform VT; and a calculating part for calculating the position of the object based on a receiving time t<SB>R</SB>specified from the reference waveform VR and the object waveform VT. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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