PURPOSE: To effectively detect the situation of the following vehicle.
CONSTITUTION: On an inner mirror 3 of a vehicle 1, an ultrared ray projector 6 which projects the ultrared ray having a prescribed intensity forwardly, in a prescribed range (θ0) in the lateral direction is installed. At the left and right parts of the inner mirror 3, two ultrared ray sensors 7 and 8 are installed. The detection range of the first ultrared ray sensor 7 is set in a range (θ1) on the left side from the straightly rear part, and the second ultrared ray sensor 8 is set in a range (θ2) on the right side from the straight rear part. A controller which judges the direction, separation distance, vehicle course change, and the approach speed of the succeeding vehicle 1(B) from the change accompanied with the ultrared ray receiving quantity detected by the ultrared ray sensors 7 and 8 and the change through the lapse of time is installed. A display, lamp and a buzzer for informing about the result of the judgement of the controller to a driver are installed.
MIYATAKE HIDEKI
YOSHIDA YUTAKA
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