A fuse for a rotating projectile, having a device for detecting the presence of a target.

摘要

A fuse (16) has a detector device (17) comprising a sensor (48) of infra-red radiation and a single flat-convex lens (19), the refracted rays of the received radiation of which are selectively blocked in such a way as to allow passage towards the sensor only of rays contained in very narrow cones of view (45). For this purpose a plate (37) provided with a series of angularly equidistant apertures (41) is adapted to receive the rays refracted from a zone (27) of the conical lateral surface (23) of the lens. The zone (27) is adjacent the flat surface (22) of the lens and directs the refracted rays to a cylindrical surface (43) which reflects them towards the optical axis (26) of the lens.