Patent ID: 8000169
Filing Date: 2011-08-16
Classification: E05F,E05Y,G01S

Abstract:
1. An object detecting apparatus detecting a position of an object based on a reflected wave generated by reflection of a transmitted ultrasonic wave from the object, the object detecting apparatus comprising: a transmitting portion controlling a transmitter to transmit the ultrasonic wave at predetermined transmission timings; a receiving portion receiving the ultrasonic waves, reaching a plurality of receivers located at different positions, as received signals of the plurality of receivers; a detecting portion detecting an envelope of each received signal; and an operation portion detecting a peak of each envelope and obtaining an approximate line with a maximum amount of change of the envelope in a change amount increasing period set to a gradient of the approximate line, provided that the change amount increasing period is defined as a time period in which an amount of change per a predetermined unit time of the envelope, heading to the peak, continues to increase, the operation portion obtaining a time that a voltage value of the approximate line equals a predetermined reference value as a receipt time of the reflected wave and detecting the position of the object based on the receipt time obtained from each envelope.