FINGERPRINT IMAGE INPUT DEVICE

摘要

PURPOSE:To obtain data on invariable the same condition by picking up an image of a finger print when a body is pressed with a finger to pressure at plural points within the same range. CONSTITUTION:The finger 1 is pressed against a prism 2, and its pressure is transmitted to a pressure sensitive part 4 through springs 3. Only when the pressure at each position is greater than a specific value or within some range, the pressure sensitive part 4 turns on, i.e. sends a signal ''1'' to an AND gate 5. When all pressure sensitive parts 4 send out signals ''1'', a controller 6 drives a light source 8 and an image sensor part 7 to pick up an image of the fingerprint.