| 摘要 |
A fingerprint processing apparatus is capable of generating a roll fingerprint image on a flat plane without distorting the image of the fingerprint. The apparatus includes a source of an interrogating light beam, optical scanning equipment, an array of photoelectric transducers, lenses, and electrical scanning equipment. A cylindrical-segment platen is provided having an upper surface with an anti-reflective coating which receives, positions and supports a finger, and a lower surface which receives and transmits the interrogating light beam. A finger positioned on the upper platen surface modulates the interrogating light beam to provide a reflected light beam having fingerprint information. A motor rotates the light source, optical scanning equipment, array, lenses, and an element of the electrical scanning equipment. The axis of rotation of the optical scanning equipment is substantially the same as the axis of the upper surface of the platen. The optical scanning equipment scans the circumference of the platen such that the angle of incidence of the light beam on the fingerprint object at the curved back of the platen remains constant. The electrical scan is along the axis of the platen. The array receives the modulated light beam and converts the fingerprint information into sets of information signals. The electrical scanning means scans the information signals and synchronizes the electrical scan to incremental positions of the optical scan.
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