| 摘要 |
PURPOSE:To facilitate the operation of parking and others by providing a device which detects the invasion of an obstacle to the closest area to display the access position while sounding an alarm for a fixed time each time the invasion of the obstacle is performed. CONSTITUTION:For example, a signal Sa1 from an access distance sensor 12a is fed to a decision circuit 14a and an output signal Sa2 is outputted to a display section 16 and an alarm section 26. A signal Sa2 inputted into an AND circuit 18a of the display section 16 serves to output a signal Sa3 to an inverter 20a from the circuit 18a through the ORing with an input from an oscillator 24. This signal Sa3 allows a flash signal Sa4 to be outputted to a display light emitting diode 22a through the inverter 20a thereby flashing the diode 22a. On the other hand, the signal Sa2 of the circuit 14a is turned to a signal Sa5 through a monostable circuit 28a and fed to an AND circuit 34 via an OR circuit 30. Then, including this, two kinds of signals, in all, added by one from the oscillator 24 are outputted to a buffer 36 as signal S6 to actuate an alarm 38. This permits a driver to operate parking easily without resotring to his intuition. |
