Device for optically obtaining a complete fingerprint, i.e. corresponding to conventional fingerprinting where finger is rolled from side to side, has objective arrangement so only one image is required

摘要

Device comprises an illuminating device (5, 6), an image receiver (9) with an objective (2, 4) for directing light reflected from the finger surface to the receiver. The objective comprises a plano-convex cylindrical lens (1) with a width exceeding that of a finger diameter, with the cylinder axis parallel to the finger axis.