Optical reception apparatus.

摘要

An optical reception apparatus is comprised of a prism made by forming in a member of substantially the frustum of circular cone made of a transparent material a concave portion of substantially circular cone or substantially the frustum of circular cone whose diameter is gradually reduced in the direction from a small diameter circular side surface to a large diameter circular side surface of the frustum of circular cone, and a light receiving element mounted on the prism at its position along a center line of a circle of the large diameter circular side surface and also in the vicinity of the large diameter circular side surface.