| 摘要 |
<p>An optical apparatus for a fingerprint recognition system comprising a light source for emitting a spherical beam, a collimating hologram for reproducing a plane beam upon receiving the emitted spherical beam from the light source, a diffuser for obtaining a scattered beam by scattering the plane beam from said collimating hologram, a prism for absorbing at ridges and reflecting at valleys of subject fingerprint upon receiving the scattered beam from the diffuser, a fingerprint image producing hologram for processing the reflected spherical beam from the prism at the valleys and then condensing a spherical beam representing the subject fingerprint upon an area CCD for producing the fingerprint image thereon, the area CCD for converting the produced fingerprint image into an electric signal, the prism including the fingerprint image producing hologram and a cutoff/absorption plate for cutting off and absorbing the beam, respectively mounted at vertical surface thereof. <IMAGE></p> |
