| 摘要 |
<p>PURPOSE:To prevent inattentive driving of a driver, by constituting the titled apparatus wherein a receiver receives the reflected wave of the sonic wave transmitted from a transmitter and a calculation means calculates the relative speed and distance with a reflective article on the basis of said reflected wave and an alarm device is operated when a judge means judged that said relative speed and distance were within a dangerous region. CONSTITUTION:A microcomputer 10 is constituted of CPU1, a program memory 8 comprising ROM and a working memory 9 comprising RAM. CPU7 allows a transmitter 2 to transmit an ultrasonic wave with frequency f1 at every 0.25sec in such a state that a receiving check switch 5 is set to an ON-state and allows a pilot lamp 4 to light when the receiver 3 receives the reflected wave from the car running ahead. Further, CPU7 calculates a relative speed and the distance between cars on the basis of the received reflected wave f2 and a receiving time T and, when judges that both calculated results are within a dangerous region in the relation of the relative speed and the distance between cars, allows an alarm speaker 6 to operate to emit alarm sound and informs danger to a driver.</p> |
