| 摘要 |
PURPOSE:To find out one-dimensional finger print information without requiring complicate signal processing by converging reflected light from a transparent surface on which a finger impressed in one direction and detecting the converged light by an optical sensor. CONSTITUTION:The finger-impressed face of a transparent body 11 is irradiated with light projected from a light source 13. Since the light is dispersed on the projected parts of the finger print and reflected on the recessed parts, a finger image signal can be obtained from the reflected light as two-dimensional information. The reflected light is linearly converged in the longitudinal direction of the finger by an optical element such as a cylindrical lens 15, the optical addition of the finger print information is executed and the finger print information is obtained by the one-dimensional optical sensor 16 as an electric signal. Consequently, a signal similar to a signal obtained by adding a signal to a finger print signal obtained as two-dimensional image information and forming an one-dimensional signal can be more simply obtained. |
