| 摘要 |
The device that detects the object not visible by the back mirror of automobile can comprises an ultrasonic transmitting and receiving section (1), an oscillator (2) which provides driving and comparing pulse to the ultrasonic sect., a comparing sect. (4), and a control sect. (6), an amplifier (3) which amplifies the ultrasonic receiving signal and outputs reflected signal, a distanct sensing sect. (5) which detects the distance of the object, a comparator (4) which provides control information according to the output signal of the amplifier, an alarm sect. (7) which generates driving output and alarm signal, and a control sect. which drives the alarm sect..
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