Object detecting apparatus, opening and closing control...

Details Object detecting apparatus, opening and closing control... Object detecting apparatus, opening and closing control...

2011-08-16

2011-08-16

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

Reexamination Certificate

active

08000169

ABSTRACT:
An object detecting apparatus detecting an object position based on a reflected wave generated by reflection of a transmitted ultrasonic wave from the object includes a transmitting portion transmitting the ultrasonic wave, a receiving portion receiving the ultrasonic waves as received signals, a detecting position detecting an envelope and an operation portion detecting a peak of each envelope and obtaining an approximate line with a maximum change amount 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 period that 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 reference value as a receipt time and detecting the object position based on the receipt time.

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