| 摘要 |
<p>PROBLEM TO BE SOLVED: To both achieve cooling performance for an internal combustion engine by a radiator and secure directivity for generated beams. SOLUTION: A generating source of a radar 11 is set in front of a radiator 10, and a parallel plate lens 20 for converging signals output from the generating source is arranged forward of the generating source. Accordingly, even when the generating source of the radar 11 in front of the radiator 10 is made compact, the parallel plate lens 20 obtains sufficient directivity. Moreover, the miniaturization of the generating source ensures sufficient cooling efficiency for the radiator 10.</p> |
