| 摘要 |
<p>PURPOSE:To obtain a small-sized, low-cost range measuring radar which takes a measurement over a wide range from long distance to short distance and is small in power consumption by providing plural signal projectors which differ in projection beam angle according to a distance measurement range. CONSTITUTION:A light emitting element 1 and a lens 2 form the 1st signal projector S1 which has a wide projection beam angle theta1 and a light emitting element 3 and a lens 4 form the 2nd signal projector S2 which has a narrow projection beam angle theta2. Those signal projectors S1 and S2 which have the different projection angles are combined together to form a transmitter TX. Consequently, the projector S1 is made to correspond to a short-range object R1 and the projector S2 is made to correspond to a long-range object R2, so that the power consumption and size are reduced on the whole. A laser light beam, a radio wave, an ultrasonic wave, etc., are applicable as a range measuring medium.</p> |
