| 摘要 |
A distance indicating device having at least one energy wave generator. Each of the generators have a focusing device to produce a directional focused beam of wave energy. Each of the wave generators have a means for mounting the generator to a vehicle and a means for adjustively positioning the generator to intersect or impact an object at a predetermined distance from the generator or the vehicle on which it is mounted utilizing the point of intersection or impact to determine the distance between the vehicle and a fixed object.An improved method for indicating the distance between a vehicle and a fixed object is also provided utilizing the focused energy wave beam generators of the improved distance indicating device of the invention.
|
