| 摘要 |
<p>A light projecting and receiving unit for use in a human body detecting apparatus having a light projecting section consisting of at least one set of concave mirrors and a plurality of light projecting elements, and a light receiving section consisting of at least one set of concave mirrors and a plurality of light receiving elements. The light projecting section and the light receiving section are formed on one side surface of a generally rectangular unit body, and the unit body is divided longitudinally into one and the other sides by a partition wall located at the longitudinal central part of the unit body and projecting vertically therefrom as an integral part thereof. Further, each of the split concave mirror sets consists of a combination of a plurality of concave mirrors oriented in different directions and arranged sequentially in the longitudinal direction of the unit body so as to have a common or the same focus.</p> |
