Biological object detecting system and fingerprint collating system employing same.

摘要

A biological detecting system comprising a light source (1); a condensing optical system (2) for condensing a light beam (L1) from the light source and irradiating the surface of a sample (5) to be detected with a spot of light, an imaging optical system (3) for condensing light (L2) reflected or scattered by an irradiated portion of the sample (5) and forming an image of the irradiated portion at a predetermined location, and a photodetector (4) arranged at the predetermined location to detect the size of the image of the irradiated portion and output a detection signal (J1) indicating the detected size of the image. The system can be applied to a fingerprint collating system for the purpose of distinguishing a real finger from a replica.