| 摘要 |
PROBLEM TO BE SOLVED: To provide a distance measuring device capable of performing a good transmission/reception by widening a transmission/reception directivity angle.SOLUTION: A distance measuring device transmits a detection wave to an object to be detected from an antenna, receives the detection wave reflected by the object to be detected by the antenna, and measures a distance to the object to be detected. The antenna is a patch antenna 1 or a patch antenna array 1 arraying a plurality of patch antennas on a plane. An element 2 side front face is provided with a metal cylinder 3B for gradually increasing an opening area with increasing distance from the antenna or a reduced diameter part 3a for gradually reducing the opening area with increasing distance from the antenna, a connection part 3b continuous to the reduced diameter part and composed of a tube having the same internal diameter as that of the connection part 3b, and an expanded diameter part 3c continuous to the connection part and gradually expanding the opening area with increasing distance from the connection part. |
